Surgery – Truss – Perineal
Patent
1974-11-12
1977-06-21
Michell, Robert W.
Surgery
Truss
Perineal
128 2L, 128 205M, A61B 502
Patent
active
040304850
ABSTRACT:
The invention relates to a method and apparatus for continuously monitoring systolic blood pressure of a subject. The instrument includes a light transducer for detecting variations in light intensity corresponding to variations in blood volume of tissue of the subject under the transducer and for converting the changes in light intensity to changes in voltage. In one embodiment, a heater is provided to dilate the tissue under the transducer. The voltage signals are differentiated with respect to time, and the differentiated signal is sampled once every heart beat of the subject at the beginning of diastole, or at the maximum value of the differentiated signal sampled during diastole, to produce a sampled voltage signal. To this sampled voltage signal is added a voltage representative of a steady pressure, and the sum is a voltage representative of systolic pressure. The amplitude of the steady pressure is a function of blood pressure in the aorta and large arteries of the subject, stiffness of the aorta and large arteries, and the total peripheral resistance of the subject.
REFERENCES:
patent: 2827040 (1958-03-01), Gilford
patent: 3628525 (1971-12-01), Polanyi
patent: 3633568 (1972-01-01), Hobel
patent: 3776221 (1973-12-01), McIntyre
patent: 3841314 (1974-10-01), Page
patent: 3850169 (1974-11-01), Gebben et al.
patent: 3903872 (1975-09-01), Link
George et al., "Measurement of Max . . . Pressure in Man", Med. Res. Eng., 4th Qt., 1967, pp. 21-24.
Naylor, "Analog Preprocessor . . . pressure", Bio-Med. Eng., vol. 6, No. 2, Feb. 1971, pp. 77-80.
Cohen Lee S.
Michell Robert W.
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