Studies have shown that when wounds are in a moist environment rather than a dry one, epithelial cells migrate faster from the wound edge to the injured area. Modern "wet therapy" wound dressings aim to create a moist environment to promote optimal healing. Alginate, after absorbing wound exudate, exchanges calcium ions in the dressing with sodium ions in the exudate, forming a gel on the wound surface that maintains adequate moisture, preventing the wound from drying out, reducing inconvenience during removal, enhancing the healing rate of skin wounds, and calcium ions can also serve as hemostatic agents. Therefore, the application of alginate in medical dressings has vast prospects.
Alginate wound dressing is a "gel-forming" dressing that can turn into a gel when it encounters wound exudate, with excellent absorption of exudate and maintenance of a moist environment. When it encounters a liquid rich in sodium ions (such as exudate and blood), calcium and sodium ions will exchange, releasing calcium ions, while sodium ions will bind to alginate to form a hydrophilic gel-like substance, which helps maintain the moist environment of the wound and enhance self-soluble debridement, as well as promote granulation tissue production. Alginate has a strong liquid absorption capacity, capable of absorbing up to 20 times its own weight in liquid. Therefore, alginate wound dressings can be used for wounds with moderate to severe exudate, and can also accelerate debridement for wounds with necrotic tissue.
Moist therapy is a modern approach that is guided by the theory of moist wound healing to use dressings and/or solutions to maintain a moist environment of the wound to promote healing. In the modern view, promoting wound healing emphasizes providing a moist environment for wound healing. Therefore, how to promote wound healing has put higher requirements on clinical wound care work, and alginate wound dressing is one of them. Skin abrasions are very common, and traditional dressing changes involve covering the wound with iodophor gauze after debridement. The disadvantage of this method is that when changing the dressing, the iodophor gauze layer must be removed, which can easily cause damage to newly formed blood vessels and skin, affecting wound healing and prolonging healing time. The modified use of alginate wound dressings can quickly absorb exudate to prevent it from returning to the wound surface. Maintaining a moist wound environment can shorten the healing time and reduce patient pain, making it worthy of clinical promotion.