An adhesion-switchable hydrogel dressing for painless dressing removal without secondary damage

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Adhesive hydrogels are promising for wound dressings but cause secondary damage during removal.
• Current hydrogel dressings face challenges in clinical application due to pain and tissue injury upon removal.

Purpose of the Study:

• To develop an adhesion-switchable hydrogel for wound dressings that allows for painless removal.
• To engineer a hydrogel with tunable adhesion properties for improved wound care.

Main Methods:

• Fabrication of a hydrogel using poly(acrylamide)-co-poly(N-isopropyl acrylamide), quaternary ammonium chitosan, and tannic acid.
• Investigated the temperature-dependent adhesion properties of the hydrogel, focusing on its lower critical solution temperature (LCST).

Main Results:

• The hydrogel exhibited robust adhesion to wet tissues at body temperature.
• Upon heating above the LCST (around 45 °C), the hydrogel underwent a phase transition, leading to adhesion loss.
• The hydrogel demonstrated facile and painless detachment from tissues, minimizing secondary damage.

Conclusions:

• The developed adhesion-switchable hydrogel offers a solution for painless wound dressing changes.
• This temperature-responsive hydrogel has significant potential for advanced wound management and long-term clinical applications.