Faculty Collaboration Database

Biomechanical strength of reconstruction plates when used for medial support of MED-El cochlear implants: implications for diagnostic MRI. ORL J Otorhinolaryngol Relat Spec 2006;68(2):77-82

Date

01/25/2006

Pubmed ID

16432305

DOI

10.1159/000091118

Scopus ID

2-s2.0-33644928452 (requires institutional sign-in at Scopus site)   7 Citations

Abstract

PURPOSE: It is hypothesized that a mesh reconstruction plate designed to fit a cochlear implant (CI) internal device will provide immediate structural support to the site of the implant and that this strength far exceeds the forces induced by a 1.5-tesla MRI.

PROCEDURES: Human calvarial specimens were drilled and plated with reconstruction mesh. Force was applied until failure was reached.

RESULTS: Mean maximum force, mean force to first failure and mean displacement measures for group 1 (resorbable mesh, n = 10) were 302.9 N, 283.0 N and 3.05 mm, respectively. The mean maximum force for group 2 (0.4-mm titanium mesh, n = 10) and group 3 (0.6-mm titanium mesh, n = 8), were 121.3 and 234.0 N, respectively. Mean force of first failure was 92.0 N for group 2 and 164.8 N for group 3.

CONCLUSIONS: The force required for failure of the mesh is significantly greater than the 0.17 N exerted on a CI magnet by a 1.5-tesla MRI scan.

Author List

Poetker DM, Wackym PA, Yoganandan N, Runge-Samuelson CL, Firszt JB, Pintar FA

Authors

Frank A. Pintar PhD Professor in the Biomedical Engineering department at Medical College of Wisconsin
David M. Poetker MD Chief, Professor in the Otolaryngology and Communication Sciences department at Medical College of Wisconsin
Narayan Yoganandan PhD Professor in the Neurosurgery department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Absorbable Implants
Biomechanical Phenomena
Bone Plates
Cadaver
Cochlear Implants
Contraindications
Equipment Design
Humans
Magnetic Resonance Imaging
Skull
Stress, Mechanical
Titanium