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Updated: Jun 24, 2026

An Implantable System For Chronic In Vivo Electromyography
09:52

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Published on: April 21, 2020

Lamination for subdermal implant fixation.

Bryan D Hori1, Royann J Petrell, Andrew W Trites

  • 1Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia, Canada.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|April 11, 2009
PubMed
Summary
This summary is machine-generated.

One-sided porous implants in rabbits showed limited tissue attachment and migrated in subcutaneous tissue. These findings inform the design of retrieval devices for marine animals.

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Area of Science:

  • Biomaterials science
  • Veterinary surgery
  • Medical device design

Background:

  • Subcutaneous implants require stable fixation.
  • Porous materials enhance tissue integration, but retrieval can be challenging.
  • One-sided porous designs offer potential for easier removal.

Purpose of the Study:

  • To evaluate the fixation and migration of one-sided porous aluminum oxide discs in rabbit subcutaneous tissue.
  • To compare the performance of discs with 0.5 mm and 1 mm porous layers.
  • To assess the influence of porous layer characteristics on implant stability and retrieval.

Main Methods:

  • Thirty-six aluminum oxide discs (0.5 mm or 1 mm porous layer) implanted into young rabbits.
  • Histological analysis of tissue encapsulation and attachment after 3 months.
  • Measurement of implant migration and pouch thickness.
  • Assessment of attachment strength.

Main Results:

  • Discs were encased in thin fibrous pouches, with minimal attachment to solid sides and limited attachment to porous sides.
  • 47% of discs showed migration beyond normal tissue displacement.
  • Porous layer thickness did not significantly affect migration rates or attachment strength.
  • Pouch thickness correlated with migration distance.

Conclusions:

  • One-sided porous discs exhibit limited subcutaneous tissue fixation and are prone to migration.
  • While potentially easier to retrieve than fully porous implants, migration cannot be prevented in young animals.
  • Findings guide the development of retrieval mechanisms for subdermal devices, including those for marine wildlife.