Biomedical materials for wound dressing: recent advances and applications (2024)

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RSC Adv. 2023 Feb 6; 13(8): 5509–5528.

Published online 2023 Feb 13. doi:10.1039/d2ra07673j

PMCID: PMC9924226

PMID: 36793301

Hien Minh Nguyen,^a Tam Thi Ngoc Le,^a An Thanh Nguyen,^b Han Nguyen Thien Le,^a and Thi Tan Pham^b

Author information Article notes Copyright and License information PMC Disclaimer

Abstract

Wound healing is vital to maintain the physiological functions of the skin. The most common treatment is the use of a dressing to cover the wound and reduce infection risk and the rate of secondary injuries. Modern wound dressings have been the top priority choice for healing various types of wounds owing to their outstanding biocompatibility and biodegradability. In addition, they also maintain temperature and a moist environment, aid in pain relief, and improve hypoxic environments to stimulate wound healing. Due to the different types of wounds, as well as the variety of advanced wound dressing products, this review will provide information on the clinical characteristics of the wound, the properties of common modern dressings, and the in vitro, in vivo as well as the clinical trials on their effectiveness. The most popular types commonly used in producing modern dressings are hydrogels, hydrocolloids, alginates, foams, and films. In addition, the review also presents the polymer materials for dressing applications as well as the trend of developing these current modern dressings to maximize their function and create ideal dressings. The last is the discussion about dressing selection in wound treatment and an estimate of the current development tendency of new materials for wound healing dressings.

Wound healing is vital to maintain the physiological functions of the skin.

Biomedical materials for wound dressing: recent advances and applications (4)

1. Introduction

A wound is a type of injury that causes a loss of continuity in the skin, tissues, and mucous membranes. Based on the time and characteristics of the healing process, wounds are classified as acute wounds and chronic wounds. While acute wounds are skin wounds or surgical wounds, chronic wounds are pressure ulcers, leg ulcers, severe burns, and diabetic ulcers.¹ Acute wounds often heal completely and without complications within four weeks, following the expected or predictable rate of healing.² Compared to acute wounds, chronic wounds are more difficult to control the wound condition with slow healing time, persistence, and abnormal healing progress and can cause serious complications that require tissue removal.¹ Both acute and chronic wounds have a severely detrimental impact on the world's healthcare systems and economies.^3,4 In the United States, injury treatment costs about 50 billion dollars annually.⁵ According to Medicare, a health insurance program, the cost of wound care for beneficiaries ranges from 28.1 to 96.8 billion dollars per year, with surgical wounds and diabetic ulcers the most expensive, accounting for 38.3 and 18.7 billion dollars, respectively.⁶ Chronic wounds are common in elders over 65 years old.⁷ Therefore, with the aging population, the number of patients with chronic wounds is expected to increase and continues to be a long-lasting problem in this population.⁸ Modern dressings are commonly used to cover wounds and generate a moist environment for wound healing. Traditional wound dressings are often used in clinical practice because they are economical, yet fibers stick to the granulation tissue, causing pain when removing the dressing. On the other hand, modern dressings maintain ideal temperature and humidity for the wound to stimulate wound healing and protect the wound from external bacteria and prevent cross-infection.⁹ Moreover, some types of dressing including alginate or hydrogel dressing have the property non-adhesive to tissues, causing less pain during dressing changes for patients, overcoming the limitation of traditional dressing.^10,11 With their advantages, many studies on modern dressings such as foams, hydrogels, alginates, hydrocolloids, and films are carried out to solve clinical problems in treating wounds.

Here, we provide an overview of the modern dressings that have been developed for wound healing applications. We look over studies on the effectiveness of different dressings and consider the advantages and limits of wound treatment. In addition, the review also mentions new materials that are of interest to researchers for dressings applications in the future. Finally, we discuss the selection of modern dressings, and the trend of developing advanced materials to develop appropriate dressings in clinical treatment.

2. Physiology of wound healing and treatment

2.1. Physiology of wound healing

Wound healing is a complicated biological process that restores tissue integrity. Acute wounds usually heal in a relatively short time frame from four to six weeks, depending on the size, depth, and extent of damage in the epidermis and dermis of the skin and the operation of growth factors, cytokines, and matrix proteins.¹² Physiologically, an acute wound healing is divided into five stages: hemostasis, inflammation, proliferation, re-epithelialization, and remodeling (Fig. 1).¹³

Biomedical materials for wound dressing: recent advances and applications (5)

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Fig. 1

Cell responses during five stages of acute wound healing.

Hemostasis is the first stage of wound healing. Clotting factors are activated in hemostasis and form a platelet knot to reduce blood loss from the injuries.¹⁴ When bleeding is under control, growth factors such as vascular endothelial growth factor (VEGF), epithelial growth factor (EGF), and cytokines are released to recruit neutrophils, monocytes, and lymphocytes to reach the injured tissue and promote the inflammatory stage.¹⁵ The inflammatory stage involves a series of responses involving neutrophils and cytokines.¹⁶ The cells participate in clearing away cells debris, and pathogens as well as releasing cytokines such as tumor necrosis factor α (TNF-α), interleukin 6, 1β (IL-6, IL-1β) to thrombolysis. The third stage is proliferation, in which platelets and leukocytes release cytokines, stimulate angiogenesis, fibroblast proliferation, collagen, and elastin synthesis to restore the dermis, leading to scar formation.^15,17 The re-epithelialization stage is the re-establishment of intact epidermis over the newly formed tissue. Cells enhance collagen and elastin synthesis to increase skin elasticity and stability. Keratocytes migrate into the wound site while proteases released by macrophages remove excess extracellular matrix (ECM).¹⁸ The last stage of wound healing process is remodeling. During this stage, recently formed capillaries regress and most macrophages and fibroblasts undergo apoptosis.¹⁹

Chronic wounds last more than 12 weeks and heal at a much lower rate than acute wounds.²⁰ Chronic wounds have abnormal sequences of epithelial regeneration due to poor tissue blood supply, tissue necrosis, infection, persistent trauma, cancer, and a high amount of matrix metalloproteinase (MMP). In addition, chronic wounds have a low rate of cell division and high levels of pro-inflammatory cytokines and proteases.²¹ Other factors affecting wound healing include nutritional deficiency, vitamin-C, zinc deficiency, and hormone deficiency such as insulin in diabetics.^22,23 These factors prolong the inflammatory stage and interfere with wound healing by continually attracting macrophages and neutrophils to the wound.^24–26 Due to abnormalities in the successive stages of chronic wound healing, tissue and epithelial regeneration are disrupted, and the wound becomes a severe ulcer.

2.2. Wound treatment

In wound treatment, wound dressings cover damaged skin, maintain a moist environment and appropriate temperature required for healing, provide physical and microbiological protection, absorb excessive tissue fluid, and provide pain relief.⁹ In the 1960s, medical experts recommended that humidifying the wound environment dramatically affects the wound healing process.^27,28 Dried wounds with eschar require extra moisture to optimize healing and soften the eschar.²⁹ On the other hand, excessive moisture leads to excessive hydration and damages the skin normal barrier function, causing ulceration.³⁰ Since then, various dressings have been designed to optimize moisture levels and create the ideal wound healing environment. Moreover, an ideal dressing not only protects a wound and maintains wound humidity but is also biocompatible, biodegradable, non-toxic, and non-allergenic while promoting gas exchange, granulation, and re-epithelialization.³¹ Modern wound dressings may also contain pharmacologically active substances such as antibiotics, non-steroidal anti-inflammatory, analgesic, and local anesthetics medicines or natural extracts with anti-inflammatory, epithelializing, antioxidant, and antimicrobial properties.^32,33 Different wounds have different physiological conditions, depth, location, and extent of the wound, the amount of discharge, infection, and wound adhesion. Therefore, it is necessary to choose the proper dressing to promote the healing process or make it worse. Therefore, healthcare workers have to understand the condition of the wound and the characteristics of each dressing to choose appropriately and promote the healing rate and quality of healing.

3. Classification of modern wound dressings

For many years, traditional dressings such as cotton wool, lint, gauze have been widely used to ensure the wound clean and prevent getting bacteria infection. However, the dressings easily stick to the wound and do not create a suitable moist environment. Modern dressings have been developed with better-improved biocompatibility, degradability, pain relief, and moisture retention. Rather than just covering wound itself, modern wound dressings also act as facilitation for the function of the wound.³⁴ Several modern dressings currently used in clinical practice include hydrocolloid, alginate, hydrogel, foam, and film dressings (Fig. 2).

3.1. Hydrocolloid dressings

3.1.1. General characteristics

Hydrocolloid dressings consist of a hydrophilic and self-adhesive colloid granule coated with an external waterproof polyurethane (PU) film (Fig. 3).^35,36 Colloid granules are commonly made of gelatin, pectin, and carboxymethyl cellulose (CMC)^35,37 and are available in various shapes, sizes, and thicknesses.³⁷ The outer layer protects the wound from bacteria, exotic agents, or other environmental impacts.³⁵

Biomedical materials for wound dressing: recent advances and applications (7)

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Fig. 3

Two layers structure of hydrocolloid dressings.

Hydrocolloid dressings can absorb a relatively large amount of wound fluids³⁸ as well as be virtually impermeable to water vapor, promoting the formation of a moist healing environment.³⁹ Furthermore, they are impermeable to oxygen, which accelerates epithelialization and collagen synthesis and decreases the wound exudates' pH, thus reducing the number of bacteria.⁴⁰ They also prevent contamination, promote autolysis to remove damaged or infected tissues, and do not require secondary dressings.^35,37,41

Hydrocolloid dressings are often incorporated with active ingredients in treating pressure ulcers or lower-extremity ulcers. They are indicated for low to moderate exuding wounds,⁴⁰ granular or necrotic wounds, and other acute wounds, including partial and full-thickness burns,³⁵ surgical or postsurgical wounds in children.⁴² Some hydrocolloid dressing products are shown in Table 1. However, this dressing is unsuitable for high exudate because there might lead to accumulation around the wound site.⁴³ To address the issues, the dressings need to be changed many times a week. Also, because of the adhesive nature that can damage the fragile surrounding skin, hydrocolloid dressings should not be used on infected wounds.³⁵

Examples of commercially available modern dressings

Type	Product name	Components	Main features	Applications	References
Hydrocolloid	DuoDerm^®	Pectin, gelatin, CMC and PU	The outer layer provides a waterproof barrier	Managing wounds with light to moderate exudate: Stage I and Stage II pressure ulcers, burn/scald, abrasions, lacerations, and reducing infection	50
			The matrix of hydrocolloid particles absorbs exudate
			They are keeping a moisture environment
	Comfeel^®Plus	NaCMC and calcium alginate is added	Allows moisture to evaporate while maintaining a moist healing environment	Chronic wounds such as leg ulcers and pressure ulcers; acute wounds such as superficial burns, superficial partial-thickness burns, donor sites, postoperative wounds and skin abrasions	51
	Comfeel^®Plus	NaCMC and calcium alginate is added	Water and bacteria proof to protect from external factors		51
	Cutinova® Hydro	Absorbent colloid covered with semiocclusive polyurethane film covering	Selective absorption: water is taken into the matrix and locked away	Venous leg ulceration, diabetic ulcers, slough, and necrotic tissues	52
			Highly absorptive granules: absorb the fluid 10 times its own weight
			Does not form a gel substance
	Replicare^®	Absorbent colloid covered with polyurethane film	Cohesive properties keep the wound free of dressing residue	Partial to full thickness wound: ulcers (venous, arterial, diabetic) pressure sores, donor sites, surgical incisions an excision, burns (grade 1st and 2nd)	53
	Replicare^®	Absorbent colloid covered with polyurethane film	Creation and maintenance of a moist wound environment		53
Alginate	Kaltostat^®	Calcium alginate with guluronic acid	Supporting moist wound healing environment	Moderate to highly exuding wounds and for wounds with minor bleeding: leg ulcers, pressure ulcers, diabetic ulcers and fungating lesions, donor sites, abrasions, lacerations and post-surgical wounds	54
	Kaltostat^®	Calcium alginate with guluronic acid	Promoting haemostatic, stop minor bleeding		54
	Algicell® Ag	Calcium alginate with 1.4% silver	Calcium alginate with 1.4% silver	Diabetic foot ulcer, leg ulcers, pressure ulcers, donor sites, and traumatic and surgical wounds	55
			Minimizing fibrous residue
			Maintaining a moist wound environment
			Antibacterial activity: Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Candida albicans
	Guardix-SG^®	Containing sodium alginate and poloxamer	Prevents adhesion by forming a physical barrier on the surface of the wound tissue	Reduce the adhesion upon spine, thyroids, and abdominal surgery	56
	Algivon^®	Alginate dressing impregnated with manuka honey	Anti-bacterial and anti-inflammatory	Eliminates odors	57
	Algivon^®	Alginate dressing impregnated with manuka honey	Maintaining the ideal moist wound healing environment	Apply for pressure ulcers, leg ulcers, diabetic ulcers, surgical wounds, burns, graft sites, infected wounds	57
	Fibracol™ Plus	90% collagen and 10% calcium alginate	Maintaining physiologically moist microenvironment to support granulation tissue formation, epithelialization and rapid wound healing	Full-thickness and partial- thickness wounds: venous ulcers, ulcers caused by mixed vascular etiologies, diabetic ulcers, second degree burns, donor sites and other bleeding surface wounds	58
	Tromboguard^®	Alginate, chitosan, polyurethane	Haemostatic activity and control severe bleeding	Used to stop bleeding in traumatic and postoperative wounds, bleeding from accidents	59 and 60
	Tromboguard^®	Alginate, chitosan, polyurethane	Antibacterial activity		59 and 60
Hydrogel	ActivHeal^®	85% of water and collection of polymer chains	Rehydrating dry necrotic wounds	Dry and sloughy wounds with nil to low exudate: pressure ulcers, cavity wounds, leg ulcers, graft and donor sites, diabetic ulcers, post op surgical wounds, lacerations and abrasions	61
			Providing a moist wound environment
			Removing devitalized tissue
			Encouraging growth and migration of epithelial cells
	Restore^®	Sodium polyacrylate, hyaluronic acid	Providing a moist wound environment	Stages II–IV pressure ulcers, diabetic skin ulcers, venous ulcers, 1st and 2nd degree burns, skin tears, cuts, abrasions, and conditions associated with peristomal care	62
	Restore^®	Sodium polyacrylate, hyaluronic acid	Non-greasy, non-staining, and fragrance free		62
	Suprasorb^® G	CMC polymers, polyethylene and acrylic polymers	Gently removing necrotic tissue	Dry wounds and wounds with low amounts of exudate, acute or chronic superficial wounds (lower leg ulcers, pressure ulcers, first- and second-degree burns, scalds)	63
			Supplying moisture
			Relieving wound pain
			Easy to mould
			Drying wounds and wounds with low amounts of exudate
	Aquaderm™	2-Acrylamido-2 methyl-1 propanesulfonic acid sodium, poly(ethylene glycol) dimethacrylate, 2-hydroxy-2-methylpropiophenone with 38–55% water	Providing soothing coolness	Pressure ulcers, minor burn, radiation tissue damage	64
			Non-traumatic, one-piece removal
			Supporting moist wound healing
			Bacteria and fluid barrier
			Absorbing minor exudate
			Transparent - easy to monitor wound
			Can be cut to fit wound site
	Neoheal^®	90% water and polyvinylopyrrolidone, PEG, agar	Maintaining of an optimal moist environment	First degree of burn wounds, second and third degree of burn wounds, ulcerations, bedsores	65
			Cooling, soothing local pain and discomfort
			Protecting wounds from external contamination
			Absorbing wound secretions
			Permeable to water vapor and oxygen but impermeable to bacteria
			Allowing the dressing to be removed without trauma
			Conforms easily to any contour of the body
			Transparent to enable wound observation and assessment of healing process
			Biocompatible, non-cytotoxic, non-allergenic
Foam	Allevyn life	Hydrophilic polyurethane foam	Providing coverage to the malleolus without the need for secondary retention	Pressure ulcers	66
			Fitting the contours of the human body securely and allowing patients to shower
			Minimizing the visual impact of strikethrough, providing the patient with confidence that their dressing may not attract the negative attention of others
			Allowing the dressing to be repositioned
	Permafoam®	Absorbent foam made of polyurethane	Transporting rapidly wound exudate and ensuring a balanced moist wound environment	Medium to heavily exuding wounds, deeper wounds	67
			Bounding safely germs and cell debris even under compression
			Soft and smooth with good padding properties
			Available in different sizes and shapes
	HydroTac^®	Hydrated polyurethane polymer and propylene glycol	Preventing the dressing from sticking to the wound	Wounds during the granulation and epithelialization phases with low to moderate exudation	68
			Absorbing wound exudate and releasing moisture
			Non-border dressing can be cut into the desired size and use a suitable secondary dressing
	Mepilex Ag	Polyurethane foam containing Ag	Soft and conformable making it easy to use and for many situations	Acute and chronic wounds	69
			Minimizing pain during dressing changes
			Minimizing the risk of leakage
			Inactivate microbial in wound (bacteria and fungi)
	Tegaderm™ Silicone foam dressing	Polyurethane foam with silicone adhesive	Absorbing and evaporating moisture to help reduce the potential for skin maceration	Pressure injuries, venous leg ulcers, neuropathic ulcers, arterial ulcers, skin tears, and surgical wounds	70
			Ability to access and assess skin
			Ability to manage microclimate
			Ease of application and removal
			Correcting dressing size for high-risk locations
Film	Bioclusive™ Plus	Transparent polyurethane film coated with acrylic adhesive	Providing a barrier to viruses 27 nm in diameter or larger and bacteria	No or light levels of exudate, suitable for secondary cover dressing and securing of catheters; minor burns, donor sites, superficial pressure areas and leg ulcers	71
	Bioclusive™ Plus	Transparent polyurethane film coated with acrylic adhesive	Allowing the transmission of oxygen and moisture vapor		71
	Mepitel	Two-sided wound contact layer coating with silicone	Preventing maceration by inhibiting the lateral movement of exudate	Skin tears or abrasions, surgical excisions, second-degree burns, blistering conditions such as epidermolysis bullosa, partial and full thickness grafts, and skin damage following radiotherapy or steroid therapy	72
	Mepitel	Two-sided wound contact layer coating with silicone	Gentle adhesion helping remove with minimum pain and without damaging new tissue		72
	Mepore^®	Polyurethane coated with polyacrylic adhesive	Bacterial and viral barrier for microbes larger than 25 nm	Secondary dressing for fixation of medical devices such as wound dressings, tubes and cannulas	73
	Mepore^®	Polyurethane coated with polyacrylic adhesive	Allowing moisture and skin transpiration to be evaporated		73
	Transeal^®	Polyurethane coated with acrylic, pressure-sensitive adhesive	Maintaining a proven high moisture vapor transmission rate	Vascular access sites, first and second degree burns, superficial wounds, surgical incisions	74
	Transeal^®		Impermeable to water and bacteria		74

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3.1.2. Trials and research

Since the first product was released to the market in 1982–1983, numerous studies have been conducted demonstrating the effectiveness of hydrocolloid dressings. Sung et al. evaluated the wound healing effect and antibacterial activity of hydrocolloid dressings containing benzalkonium chloride in in vitro and in vivo models. The results showed significant antibacterial activity against Streptococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. The excision, infection, and abrasion wound sizes were reduced after using hydrocolloid dressings containing benzalkonium chloride on rat models.⁴⁴ In another study in mice with diabetes, there was a rapid decline in inflammatory M1 macrophages and the emergence of anti-inflammatory M2 macrophages. It also showed signs of wound healing, including re-epithelialization and angiogenesis.⁴⁵ In Sung and Lee's study, using DuoDERM Extra Thin hydrocolloid dressing on 12 neonatal extravasation injuries, all wounds healed with no deficiency in function and conspicuous scars.⁴⁶ Hydrocolloid dressings were proved to prevent nasotracheal tube-related pressure injury and improve significantly the endurance of the nasal skin in pediatric patients.⁴⁷ In the study by Shinohara et al., ceramide-containing hydrocolloid dressings were investigated for hand-foot skin reaction (HFSR) on the soles of the feet in patients treated with sorafenib for metastatic renal cell carcinoma. The results indicated that 29% of the patients with grade 1 HFSR receiving hydrocolloid dressing containing ceramide developed to grade 2 and 3, lower than the control group with nearly 69%. Furthermore, the meantime for group A to have severe HFSR to grades 2 and 3 was longer than in group B, which meant that patients using hydrocolloid dressings containing ceramide might prolong time leading to the HFSR progression to grade 2 or 3. Therefore, ceramide-containing hydrocolloid dressing prevented the exacerbation of HFSR caused by sorafenib in patients with metastatic renal cell carcinoma.⁴⁸ Another clinical trial conducted by Sabando et al. showed that the novel hydrocolloid based on pectin, starch and plant extract decreased about 50% of topical edematous response. The pressure ulcer close completely without any adverse reactions.⁴⁹

3.2. Alginate dressings

3.2.1. General characteristics

Alginate is a natural polysaccharide extracted from brown marine algae, including Laminaria or Ascophyllum.⁷⁵ Alginate is also found in bacterial capsules of Azotobacter sp. and Pseudomonas sp.⁷⁶ It is a derivative of alginic acid and salts, such as calcium or sodium (Fig. 4).³⁵ The alginic acid structure consists of a linear copolymer of α-l-glucuronic acid and β-d-mannuronic acid and the glycoside linkage between these two saccharides influences the physical properties of the product.⁷⁷

Biomedical materials for wound dressing: recent advances and applications (8)

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Fig. 4

Alginate dressing and chemical structure of sodium alginate.

Alginate is a popular biomaterial known for retaining a structure similar to ECM, exhibiting high biocompatibility. Alginate dressings absorb exudates from the wound, creating a moist environment for wound healing.⁷⁸ When applied to the wound surface, alginate forms a gel and easily sloughs when removing the dressing or rinsing with sterile saline.⁷⁹ It can be in the form of porous sheets or fibrous dressings when further processed.⁸⁰ Alginate performs high absorbent properties but also maintains structural integrity stability.^81–83 Additionally, alginate dressings can reduce inflammation, wound odor, act as hemostatic agents, and have good permeability to oxygen, other gases, or liquids.⁸⁴ Therefore, alginate is suitable for treating acute and chronic wounds such as diabetic foot ulcers, pressure ulcers, burns, and infected surgical wounds.⁷⁵

Since alginate cannot self-adhesive, a secondary dressing is required.⁸⁵ In addition, if the alginate does not absorb enough fluid to form the gel, it is possible to leave excess fibers in the wounds due to the fibrous nature of alginates.⁸⁶ This phenomenon may trigger inflammatory mechanisms against foreign agents. There had been reports of an allergy where there was insufficient moisture in the wound to form a gel⁸⁷ despite alginate's high biocompatibility.

3.2.2. Trials and research

Alginate dressings have been investigated for their effectiveness in many in vitro, in vivo studies, and clinical trials, showing that the dressing improves healing, hemostasis, and cell proliferation. Various alginate-based dressings in the market are presented in Table 1. In one study, alginate containing povidone-iodine and silver nanoparticles (AgNPs) had a marked affinity for microorganisms and required fewer dressings.⁸⁸

With high biocompatibility, to increase the effectiveness of treatment, the current bandage combines alginate with many antibacterial or anti-inflammatory compounds such as ZnO nanoparticles or Edaravone. The results of the in vivo model showed that the above combined materials are safe, capable of closing the wound through keratinocyte adhesion, cell proliferation⁸⁹ or reducing inflammation.⁹⁰ Shafei et al. study promotes tissue regeneration by exosome loaded alginate hydrogel.⁹¹ This bioactive dressing not only improved wound closure, collagen synthesis, and vessel formation but also was biodegradable and biocompatible.⁹¹ In addition, alginate is also combined with many naturally derived extractions such as Malva sylvestris⁹² or oregano essential oil,⁹³ which shows antimicrobial,⁹³ anti-inflammatory and high biocompatibility properties.⁹²

Clinically, alginate dressing had been shown to be effective in healing processes, causing less pain during dressing changes for patients.^11,94 Another randomized study evaluated the clinical therapeutic effect of human granulocyte-macrophage colony-stimulating factor incorporated with alginate dressings in the treatment of refractory chronic skin ulcers. The combination showed many advantages, such as promoting granulation tissue growth, accelerating epithelial regeneration, and effectively alleviating wound pain, thus improving the patient's quality of life.⁹⁵

3.3. Hydrogel dressings

3.3.1. General characteristics

Hydrogels are hydrophilic three-dimensional polymer chains that can absorb a large volume of water due to the presence of hydrophilic moieties (Fig. 5).¹⁰ Based on the origin of component polymers, there are three types of hydrogels: natural, synthetic, and hybrid or semi-synthetic hydrogels.^10,96 Hybrid hydrogels are mainly used as they possess both the high biocompatibility of natural polymers and elastic mechanical properties of synthetic polymers.^10,96 Hydrogels can be applied either as an amorphous gel or as an elastic, solid sheet, film.^10,31

Biomedical materials for wound dressing: recent advances and applications (9)

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Fig. 5

Structure of hydrogel dressings.

Hydrogel dressings can provide a moist environment in the wound site and make favorable conditions for tissue regeneration. In addition, this characteristic also gives a comfortable, soothing effect to the wound, especially severe wounds.^97,98 However, this fluid accumulation can also lead to skin infections and bacterial growth, giving off foul odors in infected wounds.^31,97 Moreover, the hydrogel wound dressing is non-adhesive to the wound or tissues, releasing pain during dressing changes yet not disrupting wound healing.^83,96,99 The tuneable mechanical properties of hydrogels enhance their suitability for various wounds.⁹⁷

Hydrogel dressing products are usually suitable for pressure ulcers, diabetic foot ulcers, skin tears, and surgical wounds and burns, including minor burns, first and second-degree burns.^10,99 Hydrogel dressings should be used either with a secondary dressing such as film or foam or without secondary dressing.⁹⁹

3.3.2. Trials and research

Hydrogel wound dressings are a new type of high-end material with the necessary characteristics of ideal wound dressings due to the unique and flexible physicochemical properties.⁹⁷ For instance, a multifunctional hydrogel was prepared by coordinative cross-linking of multi-arm thiolated polyethylene glycol (SH-PEG) with silver nitrate followed by loading of an angiogenic drug, desferrioxamine.¹⁰⁰ This study by Chen et al. revealed that this versatile multifunctional hydrogel is a potential material in regeneration, particularly in diabetic skin wounds and open wounds, due to its flexible response with a high risk of infections and external mechanical stimuli.¹⁰⁰ Another hydrogel dressing was synthesized lately, named EHO-85.¹⁰¹ This new dressing is specially applied for moist wounds with antioxidant properties, capable of maintaining acidic environments, accelerating the healing of hard-to-heal chronic wounds and stimulating granulation tissue formation on other types of wounds.¹⁰¹ This outstanding characteristic can be explained based on the capability of adjusting pH and its antioxidant properties.¹⁰¹ Moreover, there are also many other trials and studies conducted to evaluate the effectiveness of hydrogel dressings in treating various types of wounds.^102–104 A large range of hydrogel-related wound care products available in the market (Table 1).

Furthermore, there has been a growing interest in incorporating nanoparticles or nanostructures into hydrogels for improving the properties of hydrogel wound dressings.^97,105 Silver is one of the most common nanomaterials combined with hydrogel dressings to enhance the treatment of infected wounds.^105,106 Many randomized controlled trials were carried out to evaluate the effectiveness of hydrogel/AgNP dressings and showed the positive results in wound healing.^105,106 However, the limitation of hydrogel/AgNP dressing is the high cost.¹⁰⁶ Besides AgNP, another study improved the mechanical of hydrogels by incorporating nano-clay with polydopamine and polyacrylamide.¹⁰⁷ This hydrogel displayed superior toughness owing to nanoreinforcement by clay and polydopamine-induced cooperative interactions with the hydrogel networks.¹⁰⁷ In addition, a new generation of smart hydrogel wound dressings that contain sensors has been developed rapidly for the ability to reveal wound conditions. Some remarkable studies can be mentioned such as flexible pH-sensing hydrogel fibers based on alginate in skin wounds,¹⁰⁸ polyvinyl alcohol/xyloglucan (PVA/XG) hydrogel membrane with the ability to absorb exudate and release biological factors.¹⁰⁹

3.4. Foam dressings

3.4.1. General characteristics

Foam is a porous structure that has the ability to absorb fluids into air-filled spaces based on capillary action.¹¹⁰ The most common foam dressings are made of polyurethane.¹¹⁰ Similar to the characteristics of hydrogel, foam dressing can maintain a moist environment around wounds, provides thermal insulation, and is highly absorbing, which is controlled by foam properties such as texture, thickness, and pore sizes.³¹ The porous structure with high absorbency makes foam dressing suitable for many exudating wounds.^31,110

To provide water and microbial resistant barrier to the environment, foam dressings are commonly supplied with a film-backing¹¹⁰ or a silicone membrane¹¹¹ for keeping the dressing in the right wound site and protecting the wound from trauma when changing the dressings (Fig. 6). Foam dressings can be kept for up to a week, depending on the level of exudate.¹¹² Nevertheless, this advantage is also the disadvantage of foam dressing because not frequent changes may affect the growth of new tissue and damage wounds when removing the dressing.¹¹³

Biomedical materials for wound dressing: recent advances and applications (10)

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Fig. 6

Three layers structure of foam dressings.

Foam dressings are used to treat minimal to moderate wounds, proper for burns, chronic wounds, and deep ulcers.¹¹⁴ However, these dressings are not appreciated for epithelial dry wounds, necrotic wounds, and wounds requiring frequent care.

3.4.2. Trials and research

A study investigated the effectiveness of three commercial available foam dressings, namely Mepilex Border Flex (MxBF), Allevyn Life (AL), and Optifoam Gentle EX (OGEX) in treating chronic wounds, then confirmed that these foam dressings have particular effectiveness in treating wounds, especially chronic wounds.¹¹⁵ Moreover, many available foam products are integrated with silver componence to enhance antibacterial activities. A review is conducted to analyze the results of in vitro trials to clinical data in the range of three foam dressings: Mepilex Ag, Mepilex Border Ag, and Mepilex Transfer Ag.¹¹⁶ The data showed that the silver foam dressings are effective in wound control, addressing local signs of infection in both acute and chronic wounds.¹¹⁶ These dressings are considered easy to use, provide a favorable environment to heal wounds, and do not damage when removed. Besides, treating wounds by using these dressings is cheaper than using antibiotics.¹¹⁶ In addition, the outstanding features and applications of some other foam products on the market are also provided in Table 1.

To meet the demand for treating various wounds, researchers have developed many new foam dressings. Namviriyachote et al. developed an innovative PU foam dressing comprising hydroxypropylmethylcellulose and alginate, containing silver and asiaticoside (AS).¹¹⁷ The findings showed that the foam dressing released AgNP at a 1 mg cm⁻² of silver dosage in the formula with 6% alginate and 5% AS for the most optimal antibacterial activity. This dressing improved wound healing both wound closure rate and histological parameters of skin wounds and had no dermatological reactions occurred.¹¹⁷ Another new foam dressing is mentioned to be the povidone-iodine foam dressing, known as Betafoam. To provide evidence about the effectiveness of Betafoam, a clinical trial was performed comparing Betafoam with Medifoam, a commercially available foam dressing for treating diabetic foot ulcers.¹¹⁸ The trial suggests that Betafoam is safe, has a wound healing ability similar to Medifoam, and has no adverse effects.

3.5. Film dressing

3.5.1. General characteristics

Film dressings are thin, flexible, and transparent polyurethane sheets, designed to adhere to the wound-surrounding skin and maintain moisture in the healing environment.^35,38 Film dressings are semi-permeable because of their permeability to water vapor, oxygen, and CO₂ but not water and microorganisms.³⁴ The solid adhesive property of film dressings allows them to be placed on moving surfaces such as joints but can cause damage to the wound-surrounding when removing the dressings.^86,112 Initially, the film was made from a nylon derivative with an adhesive PU framework and was not used for exudative wounds due to its limited absorption capacity.³¹ Due to its highly elastic characteristics, and transparent nature which is appropriate for checking wound closure without removing,⁸⁶ these dressings are commonly used to cover newly healed and superficial wounds, including intravenous catheter sites and split skin graft sites.⁸⁵ However, one issue that needs to be addressed is preventing fluid accumulation beneath the films. The excess exudates can inactivate the adhesive,¹¹⁹ lead to maceration and break the seal to the external environment, thus facilitating the proliferation of bacteria.¹²⁰

3.5.2. Trials and research

In the study by Jafari et al., the PU nanocomposite membrane consisting of high-molecular chitosan and titanium oxide reduced the amount of Pseudomonas aeruginosa bacteria by 63–69% independent of the concentration of nanochitosan.¹²¹ Li et al. had developed a multifunctional film dressing that combined segments of aniline trimer (AT), polyethylene glycol (PEG), and polycaprolactone (PCL). The combined PEG-PCL-AT dressing exhibited biocompatibility in both in vitro and in vivo models, antibacterial activity, and free radical scavenging ability, promoting wound healing. Furthermore, PEG-PCL-AT dressing with 12 wt% AT promotes collagen deposition and granulation tissue thickening.¹²² In addition, PU film dressings are also used to load drugs or antibiotics such as procaine.¹²³ Tang et al. developed a multifunctional elastomer film containing cetyltrimethylammonium bromide (CTAB). This dressing showed a superior antibacterial activity, with the bactericidal rate up to 90% within 12 h. In addition, the notably high collagen deposition proved the effectiveness in wound closure and healing process. The information about wound condition such as pH, temperature, and glucose level are provided real-time thanks to the fabricated sensor array within the dressing.¹²⁴ M. Kazanavičius et al. compared four types of dressing, including polyurethane (Mepilex), polyurethane with silicone membrane (Mepilex border), transparent breathable film (TBF; Mepitel film), and cotton gauze dressings. The wound healing time in the TBF group was the fastest, about ten days. Patients in the TBF group showed 66.7% of the donor sites healed by day 9, and painful feeling in this group was the mildest and shortest.¹²⁵ Another study used hydrofilm on breast cancer patients and consequently, the severity of radiation dermatitis due to the whole-breast irradiation was reduced. Hydrofilm has also been shown to reduce erythema and hyperpigmentation, completely prevent scaling, and significantly reduce symptoms of itching, burning, pain, and little inconveniences of patient's daily activities at the same times.¹²⁶ The characteristics of some film dressings are presented in Table 1.

4. Polymer materials for wound dressings

Polymers are commonly used in pharmaceutical and biomedical areas due to their biocompatibility and their similarity with ECM. The generated substrate can mimic the biological environment that helps cells participate in proliferation, differentiation,¹²⁷ and repair damaged tissue.¹²⁸ In addition, some polymers also have biodegradable and bioresorbable properties to promote the reconstruction of new tissue without inducing the inflammation.¹²⁹ In this part, a brief introduction of the representative polymers and their recent application was presented.

4.1. Cellulose and bacterial cellulose

Cellulose is a major polysaccharide in the cell wall of a plant. Cellulose comprises many glucose units in a linear form which are linked together by β-1,4.¹³⁰ With the presence of hydrogen bonds that hold the oxygen atoms and hydroxyl groups together, the linear structure of cellulose is well maintained and exhibited the biomechanics property.^130,131 As cellulose is formed from the glucose subunits, it is naturally biocompatible with human tissue and can be easily modified without affecting the structural and mechanical properties.¹³¹ Due to the semi-crystalline property in an aqueous state, cellulose can present biological effects when modified. However, pure cellulose has a major drawback due to its poor solubility in organic solvents.¹³² At below 300 °C, cellulose is completely insoluble and degraded when above this temperature.¹³³ To improve the dissolution ability, cellulose derivatives include cellulose esters (cellulose acetate), ethers (carboxymethyl cellulose, methyl cellulose, and ethyl cellulose), and cellulose sulfate represent alternatives to pure cellulose.¹³³

In contrast to plant cellulose, some bacteria, algae, and fungi produce cellulose through oxidative fermentation, which is called bacterial cellulose (BC) or microbial cellulose.¹³⁴ The BC is usually synthesized by Gram-negative bacteria such as Acetobacter, Agrobacterium, Komagataeibacter (formerly Gluconacetobacter), Achromobacter, Azobacter, Rhizobium, Salmonella or Gram-positive bacterium Sarcina ventriculi.¹³⁵ BC is considered a more biocompatible version of plant cellulose since it is free of lignin, hemicellulose, and pectin.¹³³ Therefore, BC exhibits specific characteristics, high water holding capacity due to being very hydrophilic, a large surface area, high crystallinity, and high mechanical strength.^133,135,136 BC absorbs well fluid from the wound due to high water holding capacity, the water molecules bind to the hydroxyl group in the cellulose chain. The high porosity combined with the large surface area suggests that BC can interact with antibacterial drugs or other active ingredients.¹³⁷ Despite the advanced characteristics, the high cost of BC production hinders industrial implementation. Therefore, the industrial wastes or by-products of fermentation media are utilized to improve the cost-effectiveness such as candied jujube waste water,¹³⁸ acetone-butanol-ethanol fermentation,¹³⁹ and pomegranate extract. Fig. 7 presented the semi-interpenetrating network of hydrogels based on fabricating BC and chitosan through glutaraldehyde linkage.¹⁴⁰

Biomedical materials for wound dressing: recent advances and applications (11)

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Fig. 7

Simple illustrated structure of semi-interpenetrating network.¹⁴⁰

4.2. Collagen

Collagen is an abundant natural polymer found in the ECM, accounting for one-third of the protein in the body. Collagen exists mainly in epithelial and connective tissues such as bone, cartilage, ligaments, tendon, skin and is an essential component in cell interactions, regulation of cell anchoring, and cell migration.^141,142 Cooperative with glycosaminoglycan, collagen has been an essential factor for cell attachment, proliferation, and differentiation.^143,144 The high flexibility of collagen dressings is due to the three-dimensional structure, which can absorb liquids many times their weight thanks to the accessible surface and high capillarity.¹⁴⁵ Collagen dressings reduce the risk of secondary bacterial invasion by acting as chemoattractant for neutrophils,¹⁴⁶ and affect other healing processes such as decreasing protease activity.¹⁴⁷ However, the disadvantages of collagen based-biomaterials are their rapid degradation rate and low stability, resulting in a significant loss of mechanical properties.¹⁴⁸

4.3. Chitosan

Chitosan (CS) is obtained by chitin deacetylation and extracted from the extracellular matrix of marine crustaceans, shrimp, crabs, shellfish, and some fungi.^149,150 CS is a linear polysaccharide made up of d-glucosamine and N-acetyl-d-glucosamine units. CS is a popular and renewable natural biomaterial for regenerative medicine with many valuable properties such as compatibility and biodegradability, inertness, allergenic, antibacterial, and hemostatic effects.^151,152 It is also applied to treat wounds, especially chronic wounds, infections, or ulcers.^151,153

4.4. Hyaluronic acid

Hyaluronic acid (HA) is a natural polymer found in skin, lens, or synovial fluids, composed of d-glucuronic acid and N-acetyl-d-glucosamine disaccharide. HA is characterized by high viscosity and fast degradation rate.

HA is widely used in medical fields such as orthopedics and plastic surgery because its characteristics involve several structural properties of tissues, cell signaling, and critical elements of ECM.^154,155 Additionally, HA plays a role in healing acute and chronic wounds by promoting early inflammation, increasing cellular infiltration, enhancing granulation tissue formation, and facilitating cell migration.^156–158 HA also performs good swelling behavior due to the presence of the carboxyl group in the side chains and has a thick wall structure to support the strength of the material.¹⁵⁹ The swelling–reducing properties and stable structure may prove that HA can be a potential material for dressings. However, HA is sensitive to the molecular weight factor. According to Campo et al., only medium molecular weight HA could enhance wound repair, while low molecular weights contributed to further inflammation, and high molecular weights may exert inflammatory pathologies such as rheumatoid arthritis.¹⁶⁰

4.5. Fibrinogen and fibrin

Fibrin and fibrinogen participate in various physiological functions such as fibrinolysis, cellular and matrix interactions, and the inflammatory response.¹⁶¹ In the wound healing process, fibrin and fibrinogen roles are expressed through mediating both hemostasis and homeostasis.¹⁶² Fibrinogen molecules are made up of two sets of three different peptide chains including Aα, Bβ and γ chains, and connected by disulfide bridges.¹⁶³ The formation of fibrin releases small peptides and is catalyzed by thrombin.^161,164 Fibrin is highly extensible and has elasticity properties.¹⁶⁵ The scaffolds made of fibrin or fibrinogen can attain a high cell seeding efficiency and then proliferate, migrate, and differentiate into specific tissues/organs by secreting ECM.¹⁶⁶ Fibrinogen provides a surface for cellular attachment and proliferation and consists of a fibrous network for cell signaling and cell-matrix¹⁶⁷ which is a major advantage for healing. However, these proteins are easily degraded and have poor mechanical properties.¹⁶⁸

4.6. Polylysine

Polylysine is a cationic polymer synthesized through condensation polymerization or fermentation of amino acid lysine. Lysine is available in two chiral forms which are l-lysine and d-lysine resulting in α-polylysine or ε-polylysine.¹⁶⁹ ε-Poly-l-lysine is a naturally occurring polymer and presents various characteristics: water solubility,¹⁷⁰ biodegradability, non-toxic for drug delivery systems, biological adhesives,¹⁷¹ antibacterial ability.^169,172 Because of its the biodegradability and biocompatibility characteristics, polylysine has raised the attention of medical applications.^169,173 However, due to the limitation in mechanical properties, it should be modified or blended with other polymers to improve the mechanical strength.¹⁶⁹

All studies on dressings which are natural-based polymer for wound healing applications are summarized in Table 2.

Summary of recent studies on various types of polymer materials for wound dressings^a

Material	Name of dressing	Trial	Effectiveness	References
Cellulose	Cellulose nanocrystals and AgNPs	In vivo, in vivo	No toxic effects of the combination of cellulose and AgNPs	174
Cellulose	Cellulose nanocrystals and AgNPs	In vivo, in vivo	Promoting rapid wound healing compared to control groups	174
	RPC/PB hydrogel	In vitro, in vivo	Exhibiting excellent antibacterial, skin tissue regeneration and wound closure capabilities	175
	Na CMC with merremia mammosa gel	In vivo	Not irritable, accelerating healing process through increasing collagen synthesis and angiogenesis	176
	Oxidized regenerated cellulose membrane	Clinical trials	Stop bleeding in patients with uncontrollable bleeading	177
Bacterial cellulose	BC reinforced chitosan-based hydrogel	In vitro	Showing good biocompability and excellent antibacterial activity against E. coli and S. aureus	178
	Dialdehyde carboxymethyl BC/CS composites	In vivo	Accelerating the wound healing rate and inhibit bacterial proliferation	179
	BC membrane	In vivo	Good biocompability and prevent fibrosis in trabeculectomy	180
	BC gel and associated film	Clinical trials	Decreasing significantly in the size of wound, lower dressing change frequency compared to group using Rayon®	181
	BC dressing	Clinical trials	Shorter healing time in managing second-degree burn wounds and skin graft donor sites compared to vaseline gauzes	182
Collagen	Modified collagen gel	In vitro	Enhancing macrophage attraction to the wound site, reducing proinflammatory virulence, promoting anti-inflammatory macrophage polarization, addressing wound inflammation, and improving angiogenesis	183
	Collagen-based composite dressing	Clinical trial	Forming granulation tissue, enhancing epithelialization, and having faster wound healing time	184 and 185
Chitosan	CS-based opticell dressing	In vivo	The total bleeding significantly decreased in excisional wounds mimicking debridement	186
	HemCon® dental dressing	Clinical trial	Pain values and post-extraction socket healing were lower after suture removal on treating anti-platelet patients	187
	Chitosan dressing	Clinical trial	Reducing wound size and wound depth on chronic, difficult-to-heal wounds such as diabetic ulcers, leg vein ulcers	188
Hyaluronic acid	Incorporation of PVA/HA/cellulose nanocrystals as nanofiber	In vitro	Loading with l-arginine exhibited excellent proliferative and adhesive potential, high wound gap-closure, and showed antibacterial activity against Klebsiella pneumonia	189
	0.2% HA	In vivo	Healing skin abrasions in rat's model	190
	PTE-NEs fabricated HA hydrogel	In vitro, in vivo	No toxicity, improve the wound healing through reducing inflamation, enhancing collagen synthesis, accelerating M2 macrophage polarization, and angiogenesis	191
	0.2% and 0.8% HA gel	Clinical trial	Complete epithelization. Pain and burning sensation scales were also lower. Color match scores were higher	192
	Healoderm	Clinical trial	The diabetic foot ulcer group had a higher complete healing rate, faster ulcer healing velocity, and shorter mean duration for achieving a 50% ulcer size reduction	193
Fibrinogen and fibrin	Fibrin combined with Na carboxymethylcellulose	In vitro	In the form of a mesh, supporting the fibroblast adhesion and proliferation, accelerating the wound healing	194
	Fibrin-based hydrogel load BNN6 mesoporous polydopamine nanoparticles	In vitro, in vivo	Clearing the infection of methicillin-resistant S. aureus through cell membrane and genetic metabolism damage under 808 nm laser irridation. Accelerating wound healing through collagen deposition and the proliferation of hair follicles	195
	3D salmon fibrinogen and chitosan scaffold	In vitro, in vivo	The cell proliferate in the scaffold and the wound healing is more effective than the untreated group	196
	Alginate-fibrinogen-nisin hydrogel	In vitro, in vivo	Inhibiting the bacteria growth, accelerate the formation of blood clot, show the higher rates of wound healing, re-epithelialization, and collagen deposition	197
	Heterologous fibrin sealant	Clinical trial	Heterologous fibrin sealant is safe and non-immunogenic, showing good preliminary efficacy in chronic venous ulcers treatment	198
Polylysine	Gelatin nanofiber dressing contains εPL	In vitro, in vivo	Eliciting bactericidal activity in burn wounds for fibroblasts migration and re-epithelialization. In partial thickness burns of porcine model, promoting wound closure and reduce hypertrophic scarring	199
	Carbon dots and εPL hydrogel	In vitro, in vivo	Having broad spectrum in antibacterial activity. Enhancing angiogenesis and epithelization that accelerate the wound healing rate	200
	Modified HA/εPL hydrogel	In vitro, in vivo	Killing bacteria in infected wound and improving the wound status in rat model	201
	εPL modified natural silk fiber membrane	In vivo	Exhibiting thicker granulation tissue, higher collagen composition, help accelerate wound healing rate	202

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^aAgNPs: silver nanoparticles, RPC: pH responsive cellulose, PB: poly(vinyl alcohol)/borax, CMC: carboxymethyl cellulose, BC: bacterial cellulose, CS: chitosan, PVA: poly(vinyl alcohol), PTE: Poria cocos triterpenes extract, NEs: nanoemulsions, HA: hyaluronic acid, BNN6: N,N′-disecbutyl-N,N′-dinitroso-p-phenylenediamine, εPL: ε-polylysine.

5. Discussion

Using wound dressing for wound care and treatment is an effective method, proven by the positive results from numerous experiments. Modern dressings are prioritized for research and development.^31,203 Modern dressings ensure the essential factor of creating a moist environment for wound healing, pain reduction, and antibacterial. However, the effectiveness of these popular modern dressings is still limited to only a few clinical studies. Wound dressing efficacy trials are usually performed on flat wounds, with less complexity, creating an oversimplification of the actual clinical features.²⁰⁴

On the other hand, a wound is considered a complex clinical problem, and the effectiveness of treatment depends on several factors: diagnosis, patient comorbidities, anatomical location, physiological status, and wound size.^203,204 Thus, the general recommendation is that dressing selection should be tailored to the wound and patient, under the guidance and consideration of physicians with expertise in wound treatment.^112,205,206 That would help the patients receive the proper treatment with the right purpose, achieve optimal efficiency and limit unnecessary risks during treatment.

Table 3 shows the specific advantages, disadvantages, and application range of modern dressings for different wounds, which provide a clinical guideline for selecting suitable wound dressings for effective wound healing. In addition, it is still necessary to have more research and clinical trials to demonstrate the effectiveness and safety of various types of modern wound dressings in the future.

Summary advantages, disadvantages, and application of modern wound dressing

Dressing type	Advantages	Disadvantages	Application
Hydrocolloids	Self-adhesive, no need for extra tape	The gel formed can be thick, yellow, smelly, and easy to mistake for an infection	Low to moderate exudate wounds. Scratch, post-surgery wounds, pressure ulcers, shallow leg ulcers
	Creating a light layer of padding	Not suitable for exudative wounds
	Moisturizing
	Painless during removing the dressing
	Easy to use
Alginates	High absorbency	Not suitable for dry wounds	Pressure ulcers, fluid lower-extremity ulcers, infected wounds
	Hemostasis	Sticking to granulation tissue easily if not changed frequently
	Highly biocompatible
Hydrogels	Cools, soothe wounds, and relieve pain	Not suitable for fluid oozing wounds	Burns, especially partial burns, foot ulcers
Hydrogels	Changing the physicochemical properties, forming reactive materials, responding to changes in temperature, pH, and drug release	Requiring tape for fixation	Burns, especially partial burns, foot ulcers
Foams	Absorbing and transmitting moisture	Effecting on new tissue growth ability and causing injury when removing the dressing if kept for too long	Burns, chronic wounds, deep ulcers, wounds in exudate cavities
	Wound cushion
	Not necessary to change as often, depending on the amount of discharge
Films	Thin and elastic, easy to pull, shape to the wound	Easy to fold and stick	Burns, wounds of joints, skin grafts with small thickness, superficial lacerations
	Transparent, easy to monitor wound condition	Poor absorbing, only suitable for wounds with little secretion
	Impervious to microorganisms	No antibacterial properties

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Developing new material platforms for modern dressings with positive results demonstrated through various tests has led to an innovation in improving the dressing products on the market. The current trend of creating ideal dressing products has been to combine materials with outstanding advantages needed for the wound healing process such as intrinsic antibacterial properties (AgNPs, ZnO), high biological compatibility, being environmentally friendly, and being easy to handle, particularly natural polymer materials. Novel materials have been developed to respond to the different conditions and stages of wound healing. Moreover, wound dressings are loaded with bioactive components including antibiotics, growth factors, herbal extracts, essential oil, antioxidants, anti-inflammatory agents, and vitamins, to improve therapeutic outcomes or to overcome the limitation of the dressing. Simultaneously, wound dressings components play an essential role as drug delivery systems.²⁰⁷ So far, incorporating bioactive agents into the structure of the dressing may considerably enhance its biocompatibility and qualities, resulting in a significant healing process. However, this modification might have a detrimental impact on the dressing's ability to absorb exudate and its mechanical characteristics.²⁰⁸ Thus, there is still a necessity for research to minimize negative effects that may result from modifying materials with bioactive components, for instance loss of mechanical properties or decreased cell proliferation.

Nevertheless, a variety of new materials for modern wound dressings not only creates synergistic effects from the strengths of each material but also causes difficulties in complex synthesis processes, requiring many advanced techniques, limiting the popular, cost-effective, if scaled-up production. Therefore, these new materials platforms have been not yet widely applied in clinical practice. Thus, the future tasks are to focus on developing new materials and to find solutions that simplify the material synthesis process, aiming to develop potential materials into commercial products serving social needs. In addition, future research on wound dressing production should not only stop enhancing healing treatment but also ensure aesthetic requirements after treatment and limit scar tissue formation.

6. Conclusions

Modern dressing has become a priority selection for wound care and treatment due to its advancements in promoting healing wound. With the rapid development of modern technology, more and more new potential biomaterials have been created and have been intensely exploited for wound healing applications. In this context, recent advances in the development of natural-based materials as well as the applications of modern wound dressings are presented. However, the limitations of new modern dressings are the complicated production process, the lack of quality assurance for biological materials, as well as the effectiveness of the component materials for widespread use. Thus, material scientists should have more trials and experiment to determine the actual effectiveness of new modern dressings in wound healing.

Conflicts of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.

Supplementary Material

Acknowledgments

We acknowledge the support of time and facilities from Ho Chi Minh City University of Technology (HCMUT) for this study.

Notes and references

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Biomedical materials for wound dressing: recent advances and applications (2024)

FAQs

What biomedical materials are used in wound dressing? ›

The most popular types commonly used in producing modern dressings are hydrogels, hydrocolloids, alginates, foams, and films.

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What materials are used for wound dressings? ›

Primary dressing examples: alginate; hydrofiber; or hydroactive. Secondary dressing examples: high absorbent non-adherent dressing; or foam. For deeper wounds, use an alginate alternative dressing.

What are the new biomaterials for wound healing? ›

These biomaterials can be prepared in different ways in the form of hydrogel, film, nanofiber, foam, scaffold, etc. Hydrogel wound dressings based on natural biomaterials have been introduced as a new type of wound dressing due to their structural similarity to extracellular matrix (ECM).

What are the materials in a biological dressing? ›

Unlike traditional dressings, biologic dressings often contain elements such as amniotic membrane, collagen, alginate, or growth factors, harnessing the inherent healing properties of these biological components.

What materials are used in biomedical applications? ›

Metals, ceramics, plastic, glass, and even living cells and tissue all can be used in creating a biomaterial. They can be reengineered into molded or machined parts, coatings, fibers, films, foams, and fabrics for use in biomedical products and devices.

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What are the advancements in wound care? ›

Some of the advanced wound care technologies that have been developed include bioengineered allogeneic cellular therapies, stem cell therapies, xenograft cellular matrices, and growth factors.

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What are the materials used in dressing? ›

5 Types of Wound Dressings and When to Use Them

Gauze. Gauze, or cloth, dressings are made of woven cotton fabric in various sizes and shapes. ...
Foam. Foam dressings are soft and gentle wound dressings made of polyurethane foam. ...
Transparent Film. ...
Hydrocolloid. ...
Hydrogel.

Jul 30, 2024

Read On ›

What is the equipment used for wound dressing? ›

Renewable supplies

Sterile compresses.
Non-sterile disposable gloves.
Adhesive tape and/or crepe or gauze bandage.
Sterile 0.9% sodium chloride or sterile water.
Depending on the wound: antiseptic (7.5% povidone iodine scrub solution, 10% povidone iodine dermal solution), paraffin compresses, analgesics.

What are biomaterials as advanced materials? ›

Biomaterials. Biomaterials are advanced materials that have been engineered to be compatible with biological tissues and organs (for example, muscle, bone, pancreas or hearth). They can be either synthetic or biological – their main characteristics being their biocompatibility in a defined application.

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What are the new applications of biomaterials? ›

Biomaterials are an exciting area of biomedical innovation and growth, with emerging applications across the life sciences field. This includes bioactive scaffolds, bioresorbable implants, injectable hydrogels, “organ-on-a-chip” organ models, and self-healing biomaterials.

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What material is most frequently used for wound dressing? ›

The most popular types commonly used in producing modern dressings are hydrogels, hydrocolloids, alginates, foams, and films.

Read The Full Story ›

What materials are needed for dressing change? ›

Changing Your Dressing

Put on a new pair of non-sterile gloves.
Pour saline into a clean bowl. ...
Squeeze the saline from the gauze pads or packing tape until it is no longer dripping.
Place the gauze pads or packing tape in your wound. ...
Cover the wet gauze or packing tape with a large dry dressing pad.

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Mar 11, 2023