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A novel hydrogel patch made from collagen, poly(acrylic acid), and quaternized chitosan offers improved healing for kidney surgery. This bioadhesive patch provides strong adhesion, stops bleeding, fights infection, and promotes tissue regeneration after partial nephrectomy.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Surgical Innovation

Background:

  • Partial nephrectomy is a preferred treatment for early renal cancer, but suturing causes complications like prolonged ischemia and poor healing.
  • Current medical adhesives have limitations, including poor wet adhesion and cytotoxicity, necessitating advanced bioadhesives.
  • There is a critical need for multifunctional bioadhesives that offer hemostasis, wound management, anti-infective, and healing-promoting properties.

Purpose of the Study:

  • To develop a novel multifunctional bioadhesive hydrogel patch for managing complex parenchymal organ wounds.
  • To create a stable hydrogel patch integrating rat tail collagen (Col), poly(acrylic acid) (PAAc), and quaternized chitosan (QCS) via in situ polymerization.
  • To evaluate the patch's mechanical properties, wet tissue adhesion, antimicrobial activity, and efficacy in a partial nephrectomy model.

Main Methods:

  • Incorporation of high-purity rat tail collagen (Col) as a cross-linking hub and scaffold into a poly(acrylic acid) (PAAc) and quaternized chitosan (QCS) network.
  • Utilized in situ polymerization to create a pre-formed, stable hydrogel patch.
  • Assessed tensile strength, equilibrium swelling ratio, wet tissue adhesion, in vitro antimicrobial activity, and in vivo performance in a rat partial nephrectomy model.

Main Results:

  • The optimized hydrogel patch demonstrated a unique combination of high tensile strength (172.60 kPa) and low equilibrium swelling ratio (53.87%).
  • Achieved strong wet tissue adhesion (51.28 kPa), exceeding clinical benchmarks, and exhibited significant in vitro antimicrobial properties.
  • In vivo studies showed rapid hemostasis and promoted orderly regeneration of renal tubules, confirmed by histology and repair-marker expression.

Conclusions:

  • The developed multifunctional bioadhesive hydrogel patch offers a promising solution for complex parenchymal organ wound management, particularly after partial nephrectomy.
  • This material design decouples typically conflicting properties like tensile strength and swelling, providing robust performance.
  • The patch's hemostatic, anti-infective, and regenerative capabilities highlight its potential to improve surgical outcomes and patient recovery.