Title :
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
fDate :
5/1/2006 12:00:00 AM
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;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.2006.872157
