Surgery – Truss – Perineal
Patent
1976-09-27
1979-02-27
Michell, Robert W.
Surgery
Truss
Perineal
128 205D, 128 205E, 73729, 250336, A61B 500
Patent
active
041413482
ABSTRACT:
A pressure sensor for indicating pressure in the animal or human body, such as intracranial pressure, including a housing, a bellows contained within the housing, a body pressure sensing tambour for placing the bellows in communication with pressure in the body so that the pressure will cause the bellows to move as a function of the pressure, output means, such as a radioactive source and associated shielding, contained within the housing and associated with the bellows for providing an output which is a function of the movement of the bellows, and a receiver, such as a radiation detector, located external to the body to receive the output and provide data indicative of the pressure in the body. The pressure sensor includes means associated with the bellows to enable in vivo calibration of the pressure sensor after implantation by establishing a preselected output condition during calibration. An ambient pressure sensing tambour is associated with the bellows for compensating for ambient pressure variations. The bellows is resilient, made of a material and shape which has 100% memory of elastic deformation and has a wall thickness of less than 0.001 inch, in order to provide an output which accurately reflects the pressure being monitored. The bellows has a spring rate which is substantially greater than the spring rate of the pressure sensing and ambient pressure compensating tambours thereby making the pressure sensor essentially insensitive to temperature variations.
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"A Nuclear Intra-Cranial Pressure Sensor", by Bustard et al., IEEE Trans. on Nucl. Science, vol. 4, #1, Feb. 1974, pp. 697-701.
Hittman Corporation
Jaworski Francis J.
Michell Robert W.
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