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Apparatus for the cannulation of blood vessels

  • US 5,259,385 A
  • Filed: 12/23/1991
  • Issued: 11/09/1993
  • Est. Priority Date: 12/23/1991
  • Status: Expired due to Term
First Claim
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1. An ultrasonic flow sensing assembly comprisinga. an elongated electrically conducting outer tubular member having a longitudinal axis, a distal end and a lumen extending therein;

  • b. an elongated electrically conducting inner tubular member disposed within the outer tubular member having a longitudinal axis and lumen coincident with the longitudinal axis and lumen of said outer tubular member;

    c. electrical insulating means located between the inner and outer tubular members;

    d. a piezoelectric means capable of generating and receiving ultrasonic waves which is located proximate the distal ends of the inner and outer tubular members and being electrically connected to the tubular members, and wherein the piezoelectric means is attached to the distal ends of the inner and outer tubular members providing a closure for the inner lumens thereof; and

    e. means for connecting an electrical power source to the piezoelectric means for the generation and reception of ultrasonic waves through the tubular members.

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