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Fallopian tube occlusion with a shape memory polymer device: evaluation in a rabbit model.

Shuai Tang1, Chan-Yu Zhang, Mei-Na Huang

  • 1Department of Gynecology and Obstetrics, Southwest Hospital, Third Military Medical University, Chongqing, 400038, China.

Contraception
|September 22, 2012
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Summary

Shape memory polymer (SMP) devices offer a viable method for permanent fallopian tube occlusion in rabbits. This biodegradable and biocompatible contraceptive device demonstrated a 100% contraceptive rate in the study.

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Area of Science:

  • Biomaterials Science
  • Reproductive Biology
  • Medical Devices

Background:

  • Evaluating the feasibility of novel contraceptive methods is crucial for reproductive health.
  • Shape memory polymers (SMPs) present unique properties for potential biomedical applications.
  • Fallopian tube occlusion is a method of permanent contraception.

Purpose of the Study:

  • To assess the efficacy and safety of a shape memory polymer (SMP) device for inducing permanent fallopian tube occlusion in a rabbit model.
  • To characterize the in vivo performance, including degradation and biocompatibility, of the SMP contraceptive device.

Main Methods:

  • Bilateral transuterine fallopian tube occlusions were performed in 78 New Zealand white female rabbits using a poly(dl-lactic acid)-based poly(urethane urea) SMP device.
  • Experimental group (n=48) received SMP devices, while the control group (n=30) underwent abdominal incision only.
  • Follow-up included hysterosalpingography, histologic evaluation, assessment of contraceptive effect, and observation of SMP shape memory behavior and degradation.

Main Results:

  • The SMP device exhibited rapid shape recovery within 60 seconds upon thermal stimulation (37 °C).
  • Significant in vivo degradation was observed, with 72.5% weight loss at 12 weeks, alongside aseptic inflammatory reactions.
  • Hysterosalpingography confirmed complete fallopian tube occlusion in 100% of rabbits at 12 and 24 weeks, resulting in a 100% contraceptive rate, with no pregnancies observed in the experimental group.

Conclusions:

  • Biodegradable and biocompatible SMP devices are effective for achieving reliable, instant, and permanent tubal occlusion.
  • The study supports the potential of SMP technology as a novel contraceptive solution.
  • The rabbit model demonstrated the safety and efficacy of SMP devices for transuterine fallopian tube occlusion.