Related Experiment Videos
Local hemostasis during laparoscopic partial nephrectomy using biodegradable hydrogels: initial porcine results
Sanjay Ramakumar1, William W Roberts, Oscar E Fugita
1James Buchanan Brady Urological Institute, The Johns Hopkins Medical Institutions, 4940 Eastern Avenue, Baltimore, MD 21224, USA.
Journal of Endourology
|October 25, 2002
Summary
A novel biodegradable polyethylene glycol-lactide (PEG-lactide) hydrogel effectively controlled bleeding and leakage during laparoscopic partial nephrectomy in a preclinical study. This synthetic sealant shows promise for improving hemostasis and wound closure in urologic procedures.
Area of Science:
- Biomaterials Science
- Minimally Invasive Surgery
- Urologic Oncology
Background:
- Laparoscopic partial nephrectomy presents challenges in controlling bleeding and sealing the collecting system.
- Current tissue sealants are often derived from biologic sources and difficult to apply laparoscopically.
- Synthetic, biodegradable hydrogels offer a potential solution for precise, local hemostatic control.
Purpose of the Study:
- To evaluate a novel synthetic biodegradable polyethylene glycol-lactide (PEG-lactide) copolymer for in situ hydrogel formation.
- To assess the adhesiveness of PEG-lactide hydrogels to injured renal parenchyma.
- To determine the efficacy of these hydrogels in limiting bleeding and collecting system leakage during laparoscopic partial nephrectomy.
Main Methods:
- A preclinical model using pig kidneys was developed for laparoscopic partial nephrectomy (wedge excision or polar amputation).
- PEG-lactide hydrogel was applied laparoscopically and polymerized in situ using a xenon light source.
- Bleeding was quantified, and collecting system leakage was assessed under perfusion pressure, comparing hydrogel treatment to a conventional "clamp and wait" strategy.
Main Results:
- Successful in situ polymerization and adhesion of PEG-lactide hydrogels to renal parenchyma were achieved in all cases.
- The hydrogel group demonstrated a significant reduction in bleeding (mean score 0.00 vs. 2.63) and blood loss (0.00 ml vs. 56 ml) compared to controls (P < 0.001).
- No collecting system leakage was observed even at 100 mm Hg perfusion pressure.
Conclusions:
- Biodegradable PEG-lactide hydrogels can be rapidly formed in situ on renal surfaces, creating adherent barriers.
- These hydrogels effectively prevent bleeding at physiologic pressures following partial nephrectomy.
- Locally applied occlusive hydrogels represent a promising advancement for hemostasis and wound control in laparoscopic urologic surgery.