Surgery – Truss – Perineal
Patent
1977-03-22
1978-08-01
Michell, Robert W.
Surgery
Truss
Perineal
73194A, A61B 502
Patent
active
041036794
ABSTRACT:
A method and apparatus for noninvasive, quantitative measurement of blood flow rate in a blood vessel includes a transducer array placed on the skin surface above the vessel of interest. The array is formed of transmitting and receiving elements for transmitting and receiving beams of ultrasonic energy. Pulsed ultrasonic energy is transmitted by the array into the body tissue and intercepts the flow in the blood vessel at a slant angle which is determined by electronically steering the transmitted beam, causing it to rotate through a predetermined angular change. The resulting Doppler frequency shifts of the received ultrasonic energy backscattered by moving particles of the blood flow associated with the angular orientation of the transmitted beam can then be measured. Through electronic range gating techniques, the Doppler frequency shifts at the determined slant angle are measured at various depths or ranges below the skin at different positions across the vessel cross-section. From the aforementioned Dopper frequency shifts and slant angle, the velocity profile of the blood through a cross-section of the vessel can be determined and the blood flow rate at any instance of time can thereby be quantitatively measured.
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Hottinger, C. F. et al., "Ultrasonic Technique for Unambiguous Measurement of Blood Volume Flow," IEEE UTS Symposium Proceedings, IEEE cat. No. 74, CHO 896-1SU 1974, pp. 667-670.
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Biosonics, Inc.
Jaworski Francis J.
Michell Robert W.
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