Surgery – Truss – Pad
Patent
1977-09-30
1980-05-27
Cohen, Lee S.
Surgery
Truss
Pad
128774, 128782, 33125R, 73781, 338 2, A61B 504, A61B 510
Patent
active
042045444
ABSTRACT:
A myocardial transducer for simultaneously measuring force and displacement within a very small area of myocardium comprising an elongated body forked at one end to form an inverted Y-shaped beam, each branch of the beam constituting a low-compliant tine for penetrating the myocardium to a predetermined depth. Each tine has a transverse indentation formed around at least a part of it. When the tines are inserted into a heart, the surface membrane of the myocardium closes around the indentations to hold the tines in place. Bonded to one of the low-compliance tines is a small piezoresistive element for converting a force acting on the beam into an electrical signal. A third high-compliant tine of the transducer, which measures displacement of the myocardium in a direction in line with the two low-compliant tines, is of a length that just pierces the surface membrane. A small piezoresistive element is bonded to the third tine at its upper end where its bending is greatest. Displacement of the myocardium causes a deformation in curvature of the third tine, and the second small piezoresistive element bonded to the surface of its curved end converts its deformation into an electrical signal. A separate electrode placed on the epicardium and referenced to the transducer body provides an ECG signal simultaneously with force and displacement signals.
REFERENCES:
patent: 2406600 (1946-08-01), Forestiere
patent: 2815424 (1957-12-01), Painter
patent: 3263684 (1966-08-01), Bolton
patent: 3722005 (1973-03-01), Cowland
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patent: 4135518 (1979-01-01), Dutcher
Kadefors et al., "A Percutaneous Electrode . . . Humans", Med. & Bio. Eng., vol. 8, No. 2, pp. 129-135, 1970.
Culler Virgil H.
Feldstein Cyril
Lewis Gilbert W.
California Institute of Technology
Cohen Lee S.
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