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Drug Eluting Embolization Particles for Permanent Contraception.

Hannah VanBenschoten1, Shan Yao2, Jeffrey T Jensen2

  • 1Department of Bioengineering, University of Washington, 3720 15th Avenue Northeast, Seattle, Washington 98105, United States.

ACS Biomaterials Science & Engineering
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Summary

New microparticle technology offers a nonsurgical path to permanent contraception by inducing tubal scarring. This approach utilizes drug-eluting fibers to control inflammation and achieve effective fallopian tube occlusion for family planning.

Keywords:
controlled releasedrug deliveryelectrospinningpermanent contraceptionsclerosing agents

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Area of Science:

  • Biomaterials Science
  • Reproductive Medicine
  • Drug Delivery Systems

Background:

  • Nonsurgical permanent contraception methods are needed to improve access and address unmet family planning needs.
  • Achieving permanent fallopian tube occlusion requires inducing acute epithelial trauma followed by sustained fibrotic inflammation.
  • Current methods may have limitations in accessibility or efficacy, highlighting the need for novel approaches.

Purpose of the Study:

  • To develop and evaluate drug-eluting fiber-based microparticles for nonsurgical permanent contraception.
  • To create a system capable of tunable drug dose and release for controlled induction of tubal occlusion.
  • To assess the efficacy of these microparticles in a validated animal model.

Main Methods:

  • Fabrication of drug-eluting microparticles using free-surface electrospinning for scalable manufacturing.
  • Modulation of nanofiber formulation (drug loading, hydrophobicity, polymer properties, crystallinity) to control drug release kinetics.
  • In vivo assessment of microparticle formulations in a newly developed guinea pig model for contraception.
  • Evaluation of acute trauma and sustained inflammatory responses in the fallopian tubes.

Main Results:

  • Fiber microparticles demonstrated high encapsulation efficiency for diverse sclerosing agents.
  • Formulations with bolus release doxycycline effectively induced acute tubal epithelial trauma.
  • Microparticles formulated with highly loaded phenyl benzoate promoted sustained inflammation.
  • The size and shape of electrospun microparticles suggest potential for agglomeration and inflammatory activity in the fallopian tubes.

Conclusions:

  • Drug-eluting fiber microparticles offer a promising strategy for nonsurgical permanent contraception.
  • Tunable drug release properties enable controlled induction of the necessary inflammatory cascade for tubal occlusion.
  • The developed technology shows potential for effective and accessible permanent family planning solutions.