Biotelemetric passive sensor injected within tendon for strain and elasticity measurement

Author

Pichorim, S.F. ; Abatti, P.J.

Author_Institution

CPGEI/CEFET-PR-Parand Fed. Center of Technol. Educ., Curitiba

Volume

53

Issue

5

fYear

2006

fDate

5/1/2006 12:00:00 AM

Firstpage

921

Lastpage

925

Abstract

A passive and injectable (using hypodermic needle) biotelemetric sensor for measurements of tendon length changes has been developed. From these measurements tendon strain and Young´s modulus of elasticity can be derived. The sensor(about 2.1 times 29mm) is a LC circuit fixed in tendon by metallic anchors (barbs), where the value of the resonance frequency is modulated by displacement of a mobile ferrite core. The sensor was injected into digital extensor tendon of pig,allowing the determination of its stress-strain curve and, consequently, of Young´s modulus of elasticity of the tendon. Practical results, such as sensitivity of 18.199kHz/mm (correlation coefficient of 0.9891)for strains up to 5.17%, mechanical hysteresis of 6.5%, and Young´s modulus of 0.9146 GPa for a pig tendon (post mortem),are presented and discussed

Keywords

Young´s modulus; biological tissues; biomechanics; biomedical telemetry; elasticity; hysteresis; strain sensors; stress-strain relations; LC circuit; Young modulus; digital pig extensor tendon; elasticity measurement; injectable biotelemetric passive sensor; mechanical hysteresis; mobile ferrite core; resonance frequency; strain measurement; stress-strain curve; tendon length; Biosensors; Capacitive sensors; Elasticity; Length measurement; Needles; RLC circuits; Resonance; Resonant frequency; Strain measurement; Tendons; Biomedical telemetry; Young´s modulus; passive and injectable sensor; tendon; Animals; Elasticity; Equipment Design; Equipment Failure Analysis; Injections; Prosthesis Implantation; Stress, Mechanical; Swine; Telemetry; Tendons; Transducers;

fLanguage

English

Journal_Title

Biomedical Engineering, IEEE Transactions on

Publisher

ieee

ISSN

0018-9294

Type

jour

DOI

10.1109/TBME.2006.872157

Filename

1621143