Surgery – Truss – Pad
Patent
1986-02-11
1988-09-13
Jaworski, Francis J.
Surgery
Truss
Pad
A61B 1000
Patent
active
047701854
ABSTRACT:
A system for endoscopic detection of blood flow is disclosed. A catheter is sized to pass through the biopsy channel of an endoscope and includes an elongated catheter tube of flexible material and an ultrasonic probe carried by the catheter tube adjacent its tip. Depending on the application, the ultrasonic field provided by the ultrasonic probe may be either transverse or parallel to the longitudinal axis of the catheter tube and may be either highly directional, omnidirectional, or sectorial. The ultrasonic probe is coupled to a pulsed Doppler circuit (FIG. 16) by an isolation circuit (FIG. 20) that provides electrical isolation and RFI suppression. The Doppler circuit is designed to enhance close proximity detection of blood flow, to limit the range of the probe's ultrasonic field, and to distinguish between arterial blood flow, venous blood flow, and vessel wall motion.
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Gilbert David A.
Martin Roy W.
Silverstein Fred E.
Jaworski Francis J.
The Board of Regents of the University of Washington
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