Durometer for indentible tissue and the like

Details Durometer for indentible tissue and the like Durometer for indentible tissue and the like

1977-01-12

1979-01-02

Cohen, Lee S.

Surgery

Truss

Perineal

73 81, A61B 510

Patent

active

041322240

ABSTRACT:
A pair of parallel flexible beams, here illustrated as flat steel springs, extend forwardly from a handle. One end of one spring beam is formed at a right angle to provide a laterally-extending tissue-engageable indentor which passes through, and extends beyond a forked opening in the end of the other spring beam. Separate strain gages are mounted on the spring beams. When the indentor is pressed into tissue, deflection of the indentor beam is determined by change in electrical characteristics of the corresponding strain gage through a bridge circuit and is indicated in a digital read-out display on the handle. When the indentor beam deflects sufficiently for the end of the forked beam to contact the tissue, and begin to deflect, the resulting change in electrical characteristics of the strain gage on the forked beam generates a lock signal which "freezes" or locks the reading in the read-out display as of the time of initial deflection of the forked beam.

REFERENCES:
patent: 1549115 (1925-08-01), Hancock
patent: 2372662 (1945-04-01), Dewey
patent: 2460726 (1949-02-01), Arndt, Jr.
patent: 3201976 (1965-08-01), Starrett et al.
patent: 3934463 (1976-01-01), Venderjagt
patent: 3956924 (1976-05-01), Hansen et al.

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