Surgery – Truss – Pad
Patent
1984-09-05
1986-06-10
Howell, Kyle L.
Surgery
Truss
Pad
7386125, A61B 1000
Patent
active
045937001
ABSTRACT:
An ultrasonic wave blood flow meter comprises a probe which sends to and receives an ultrasonic wave reflected with Doppler effect from the blood flow, a detecting circuit for converting a frequency variation of the received reflected wave into a first signal whose amplitude varies with frequency and a second signal whose amplitude is kept constant, and first and second effective-value detecting circuits for obtaining d.c. components of the first and second signals. A level discrimination circuit is further provided for discriminating the level of the d.c. component detected by the second effective-value detecting circuit. First and second sensitivity-variable amplifiers are also provided for varying their sensitivities in accordance with the result of the level discrimination circuit. A dividing circuit divides the d.c. component amplified by the first sensitivity-variable amplifier by the d.c. component amplified by the second sensitivity-variable amplifier, and a voltage hold circuit holds the output of the dividing circuit in accordance with the discrimination result of the level discrimination circuit.
REFERENCES:
patent: 4434669 (1984-03-01), Roberts et al.
patent: 4541437 (1985-09-01), Amemiya
Amemiya, S., European Patent Application 0102733 (publication No.) published Mar. 14, 1984.
Hayakawa Yoshihiro
Nakamura Yasuhiro
Tachita Ryobun
Yano Tsutomu
Howell Kyle L.
Jaworski Francis J.
Matsushita Electric - Industrial Co., Ltd.
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