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Bio-packaged transponder MEMS implanted in rats.

R Rodriguez1, A M Loske, M Estevez

  • 1Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, México. rogelior@unam.mx

Journal of Biomaterials Science. Polymer Edition
|February 7, 2012
PubMed
Summary

A new hydroxyapatite hybrid material was developed for implanting micro-electro-mechanical systems (MEMS). This biocompatible material showed excellent endurance and acceptance in rat subcutaneous implants for 9 months.

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Area of Science:

  • Biomaterials Engineering
  • Biocompatibility Studies
  • Medical Device Packaging

Background:

  • Developing biocompatible materials for implantable electronic devices is crucial for in-vivo applications.
  • Micro-electro-mechanical systems (MEMS) require protective packaging that integrates seamlessly with biological tissues.
  • Existing biomaterials may lack the necessary mechanical properties, porosity, or long-term stability for such applications.

Purpose of the Study:

  • To design and characterize a novel hydroxyapatite-based hybrid material as a bio-package for implantable MEMS.
  • To evaluate the material's physical, mechanical, and morphological properties for suitability as a bio-package.
  • To assess the biocompatibility and in-vivo performance of the MEMS bio-package in a subcutaneous rat model.

Main Methods:

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  • A hybrid biomaterial was synthesized by reacting hydroxyapatite powder with alkyd-based polyurethane.
  • Controlled porosity (100-350 μm pore size, 50% volume fraction) was achieved.
  • Material characterization included X-ray diffraction, scanning electron microscopy, densitometry, abrasion, and mechanical testing.
  • Twelve MEMS devices packaged with the material were implanted subcutaneously in rats for up to 9 months.

Main Results:

  • The synthesized material exhibited controlled porosity and interconnected pores, meeting implant requirements.
  • The bio-package demonstrated high wearing resistance and hydrolytic stability, indicating excellent endurance.
  • Histological analysis of surrounding soft tissues revealed good biocompatibility and acceptance of the implants after 9 months.

Conclusions:

  • The novel hydroxyapatite-based hybrid material is a promising candidate for bio-packaging implantable MEMS.
  • The material's properties support its use in long-term subcutaneous implantation.
  • The successful in-vivo study validates the material's biocompatibility and suitability for medical device applications.