Surgery – Diagnostic testing – Cardiovascular
Patent
1998-05-07
2000-01-18
O'Connor, Cary
Surgery
Diagnostic testing
Cardiovascular
128900, 128903, 600481, 600503, A61N 500
Patent
active
060153865
ABSTRACT:
A system for monitoring blood pressure within a blood vessel of a living being. The system includes an implantable sensor unit and an associated externally located energy application transceiver. The sensor unit is in the form of a housing including a movable deflection member and a tuned circuit including an inductor coil and a capacitor. The housing surrounds the wall of the blood vessel and includes a wall portion arranged to flatten a portion of the periphery of the blood vessel. The deflection member extends through a slot in the wall portion of the housing for engagement with only the flattened portion of the blood vessel to move in response to the pressure applied to the flattened portion of the blood vessel by the blood. The deflection member includes a ferrite core. The ferrite core is arranged to move with respect to the coil in response to the movement of the deflection member, thereby changing the inductance of the tuned circuit. Electrical energy is provided from the transceiver unit to energize the tuned circuit of the sensor unit, which when energized provides a wireless electrical output signal representative of pressure changes within the blood vessel back to the transceiver. Since the deflection member only engages the flattened portion of the blood vessel the electrical output signal is linear with respect to blood pressure.
REFERENCES:
patent: 5720771 (1998-02-01), Snell
patent: 5791344 (1998-08-01), Schulman et al.
patent: 5873837 (1999-02-01), Lieber et al.
An Article entitled "A Noninvasive Electromagnetic Conductivity Sensor for Biomedical Applications"; Hart, et al., IEEE Transactions On Biochemical Engineering, vol. 35, No. 12, Dec., 1988.
An Article entitled "A System to Aquire and Record Physiological and Behavioral Data Remotely from Nonhuman Primates"; Spelman, et al., IEEE Transactions On Biomedical Engineering, vol. 38, No. 12, Dec., 1991.
Clupper Harold
Kensey Kenneth
Astorino Michael
BPM Devices, Inc.
O'Connor Cary
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