<unk> s are three-dimensional networks consisting of chemically or physically cross-linked hydrophilic polymers. The insoluble hydrophilic structures absorb polar wound exudates and allow oxygen diffusion at the wound bed to accelerate healing.<unk> s can be designed to prevent bacterial infection, retain moisture, promote optimum adhesion to tissues, and satisfy the basic requirements of biocompatibility.<unk> s can also be designed to respond to changes in the microenvironment at the wound bed.<unk> s should promote an appropriate microenvironment for angiogenesis, recruitment of fibroblasts, and cellular proliferation.<unk> s respond elastically to applied stress; gels made from materials like collagen exhibit high toughness and low sliding friction, reducing damage from mechanical stress.<unk> s should possess mechanical and physical properties similar to the 3D microenvironment of the extracellular matrix of human skin.<unk>  wound dressings are designed to have a mechanism for application and removal which minimizes further trauma to tissues.<unk> s can be sorted into the categories: synthetic, natural, and hybrid. Synthetic<unk> s have been produced using biomimetic extracellular matrix nanofibers such as polyvinyl alcohol (PVA). Self-assembling designer peptide<unk> s are another type of synthetic<unk>  in development. Natural<unk> s are further subdivided into either polysaccharide-based (e.g. alginates) or proteoglycan- and/or protein-based (e.g. collagen). Hybrid<unk> s incorporate synthetic nanoparticles and natural materials.
Hydrogel dressing
Hydrocolloid dressing
Alginate dressing
Occlusive dressing
Wound closure strip
Surgical tape
Surgical suture
Polymer sponge