Blood pressure measuring instrument

Details Blood pressure measuring instrument Blood pressure measuring instrument

1977-04-15

1979-03-20

Michell, Robert W.

Surgery

Truss

Perineal

128 205M, 128 205Q, A61B 502

Patent

active

041448790

ABSTRACT:
A pressure is applied by pressure means to a blood vessel from the outside, and gradually reduced, and the pressure resulting from movement of the blood pressure during the pressure reduction is converted by a pressure sensor into an electric signal. The converted output is differentiated twice, and it is detected that a first-polarity pulse, a second-polarity pulse and another first-polarity pulse are generated successively in the differentiated output waveform within a predetermined period of time. The highest blood pressure is obtained with the pressure of the pressure means at the moment of first detection of three such pulses, and the lowest blood pressure is obtained with the pressure of the pressure means when the above detection is no longer achieved. The measured values are recorded in a digital form and, at the same time, the converted output waveform is recorded.

REFERENCES:
patent: 3552383 (1971-01-01), Kreuger
patent: 3654915 (1972-04-01), Sanctuary
patent: 3903872 (1975-09-01), Link
patent: 3985123 (1976-10-01), Herzlinger et al.
Angelakos, E. T., "Semiconductor Pressure Microtransducers for Measuring Velocity and Acceleration of Intra-ventricular Pressures", Amer. Jrnl. Med. Electronics, Oct.-Dec. 1964, pp. 266-270.
George, M. et al. "Measurement of the Maximum Rate of Rise of Aortic BP in Man", Med. Research Engr., Fourth Quarter 1967, pp. 21-24.

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