Telemetric differential pressure sensor with the improvement of a conductive shorted loop tuning element and a resonant circuit
First Claim
1. A telemetric in vivo differential pressure sensitive device adapted for implantation in the living body, the device including:
- (a) a housing;
(b) a generally planar flexible diaphragm fluid pressure sealed with respect to and supported by said housing so that said flexible diaphragm communicates on its opposite sides with pressures in two regions external to said device when the device is adapted to be implanted in the living body whereby a change in the difference of the two external pressures will produce a displacement of at least a portion of the flexible diaphragm;
(c) a telemetry electronic circuit including a coil inductor mounted on said housing, said circuit having a telemetered characteristic response parameter that changes upon a change in the inductance of said coil inductor, and;
(d) a single shorted generally planar loop of electrically conductive material coupled to the coil inductor of said telemetry electronic circuit and mounted with respect to and movable with said flexible diaphragm so that displacement of said at least a portion of the flexible diaphragm changes the inductance of the coil inductor whereby the telemetered characteristic response parameter changes as a function of the displacement of said at least a portion of the flexible diaphragm.
3 Assignments
0 Petitions
Accused Products
Abstract
An improvement in design of an implantable telemetric differential pressure sensing device enabling thinner, more compact, and simplified construction for the device; increased pressure sensitivity and range of measurement; and a wider class of applications for such pressure sensing devices in diagnostic medicine and clinical monitoring. The implanted device includes a thin, planar, closed, conductive loop which moves with a flexible diaphragm, the diaphragm moving upon changes in the difference of two bodily pressures on its opposite sides. The position of the conductive loop relative to a resonant circuit fixed in the device determines the resonant frequency of the resonant circuit. The resonant frequency is detected telemetrically outside the body, and its value is used to determine the difference in the two bodily pressures.
196 Citations
15 Claims
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1. A telemetric in vivo differential pressure sensitive device adapted for implantation in the living body, the device including:
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(a) a housing; (b) a generally planar flexible diaphragm fluid pressure sealed with respect to and supported by said housing so that said flexible diaphragm communicates on its opposite sides with pressures in two regions external to said device when the device is adapted to be implanted in the living body whereby a change in the difference of the two external pressures will produce a displacement of at least a portion of the flexible diaphragm; (c) a telemetry electronic circuit including a coil inductor mounted on said housing, said circuit having a telemetered characteristic response parameter that changes upon a change in the inductance of said coil inductor, and; (d) a single shorted generally planar loop of electrically conductive material coupled to the coil inductor of said telemetry electronic circuit and mounted with respect to and movable with said flexible diaphragm so that displacement of said at least a portion of the flexible diaphragm changes the inductance of the coil inductor whereby the telemetered characteristic response parameter changes as a function of the displacement of said at least a portion of the flexible diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification