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Submucosal Hydrogel for Spring-Mediated Intestinal Lengthening.

Fereshteh Salimi-Jazi1, Narelli de Paiva Narciso2, Gillian Fell3

  • 1Division of Pediatric Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California, USA.

Journal of Biomedical Materials Research. Part A
|September 22, 2025
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Summary

Engineered hydrogels enable endoscopic spring placement for intestinal lengthening. This gel-enabled, spring-mediated distraction enterogenesis shows promising results for expanding the intestinal epithelium.

Keywords:
hydrogelintestinal lengtheningspring‐mediated distraction enterogenesis

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Gastroenterology

Background:

  • Spring-mediated distraction enterogenesis is a technique for intestinal lengthening.
  • Current methods require external plication with sutures for spring confinement, increasing morbidity.
  • Minimizing invasiveness through endoscopic device insertion is a key goal.

Purpose of the Study:

  • To investigate the use of engineered hydrogel for temporary spring confinement within an intestinal segment.
  • To assess the feasibility of gel-enabled, spring-mediated distraction enterogenesis for intestinal lengthening.
  • To evaluate the impact of hydrogel-confined springs on intestinal segment expansion and histology.

Main Methods:

  • Engineered hydrogels (hyaluronic acid alone or with elastin-like protein) were developed.
  • Hydrogel was injected into the submucosa of porcine jejunum to confine a compressed nitinol spring.
  • Intestinal segments were analyzed after 7 days for lengthening and histological changes.

Main Results:

  • Both HA and HELP hydrogels effectively confined the springs, leading to intestinal segment expansion.
  • The HA group showed 132% lengthening, while the HELP group showed 188% lengthening.
  • Histological analysis revealed increased crypt width and decreased crypt density, indicating epithelial expansion.

Conclusions:

  • Engineered hydrogels provide effective temporary spring confinement for spring-mediated distraction enterogenesis.
  • Gel-enabled endoscopic spring placement minimizes morbidity associated with current techniques.
  • The mechanical stimulation from the spring promotes crypt fission and intestinal epithelial expansion, supporting its clinical feasibility.