Vital signs monitor pumping system

Details Vital signs monitor pumping system Vital signs monitor pumping system

1988-10-05

1990-09-25

Green, Randall L.

Surgery

Truss

Pad

128177, A61B 500

Patent

active

049586360

ABSTRACT:
A pump supplies a variable pressure to an occluding cuff of a blood pressure monitor. This pump includes a pumping member that is driven through a stroke in response to a drive signal having a fixed frequency but a variable duty cycle such that the length of the stroke is variable in response to variations in the duty cycle. The drive signal is generated at a selected driving frequency which is outside of and greater than the measuring frequency range of the blood pressure monitor. In this way, strokes of the pump do not cause pressure variations in the cuff within the measuring frequency range.

REFERENCES:
patent: 3118383 (1964-01-01), Woodward
patent: 3162134 (1964-12-01), Lovell
patent: 3221798 (1965-12-01), Kofink
patent: 3610782 (1971-10-01), McGuire
patent: 3819305 (1974-06-01), Klochemann et al.
patent: 4150922 (1979-04-01), Cuenoud et al.
patent: 4295471 (1981-10-01), Kaspari
patent: 4493326 (1985-01-01), Hill et al.
patent: 4669485 (1987-06-01), Russell
"Characterization of the Oscillometric Method for Measuring Indirect Blood Pressure", by L. A. Geddes et al., Biomedical Engineering Center, Purdue University, West Lafayette, Ind., pp. 271-280.

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