Surgery – Truss – Pad
Patent
1992-01-17
1993-07-06
Cohen, Lee S.
Surgery
Truss
Pad
128682, 128685, A61B 502
Patent
active
052244849
ABSTRACT:
An automatic blood pressure gauge uses two pulse width modulated solenoid valve to achieve a substantially linear deflation curve. The solenoid valves are controlled by a valve switching signal that has a fixed fundamental frequency. The gauge samples and digitizes the cuff pressure signal. To eliminate artifacts related to the valve switching signal, a microprocessor in the gauge filters the sampled data pressure signal using a third-order Chebychev 2 filter having a zero at the frequency of the valve switching signal. A single timing source used for controlling the microprocessor is also used for developing both the valve switching signal and the sampled data pressure signal, in order to achieve high attenuation of the valve switching signal components in the pressure signal via the Chebychev filter. In addition, the analog to digital converter which develops the digital samples is a sigma-delta type converter which has a Nyquist frequency greater than the frequency of the valve switching signal and which includes a low pass filter that further attenuates the switching signal artifacts relative to the patient's blood pressure pulse signal. Additionally, one of the solenoid valves is used when relatively low flow rates are desired from a relatively highly pressurized cuff while the other valve is used when relatively high flow rates are desired from a cuff having a relatively low fluid pressure.
REFERENCES:
patent: 4427013 (1984-01-01), Nunn et al.
patent: 4735213 (1988-04-01), Shirasaki
patent: 4796184 (1989-01-01), Bahr et al.
patent: 4949710 (1990-08-01), Dorsett et al.
patent: 5038790 (1991-08-01), Malkamaki
Cohen Lee S.
Edelman Lawrence C.
Nasser Jr. Robert L.
Siemens Medical Electronics, Inc.
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