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Intravascular imaging apparatus and methods for use and manufacture

  • US 5,243,988 A
  • Filed: 08/07/1992
  • Issued: 09/14/1993
  • Est. Priority Date: 03/13/1991
  • Status: Expired due to Term
First Claim
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1. An ultrasonic imaging apparatus for coronary vessels of a patient comprising:

  • a flexible tubular transducer sheath having a distal end positionable in a coronary vessel of the patient while a proximal end extends out of the patient;

    a drive cable located in a lumen of said sheath, said drive cable connected at a proximal end to a motor for rotating said drive cable with respect to said sheath, said drive cable also connected at a proximal end thereof to a signal processing unit for generating and receiving electric pulses; and

    a sensor portion connected to a distal end of said drive cable and rotatable therewith in relation to said sheath, said sensor portion located within said sheath and generally along a central axis of said drive cable, said sensor portion including a transducer portion having a generally flat surface oriented to face perpendicularly to said axis, said transducer portion further comprising;

    a core portion;

    conductive layers located on opposite faces of said core portion;

    a matching layer located over a conductive layer on a face of said core portion; and

    a backing layer located over a conductive layer on an opposite face of said core portion from said matching layer and extending perpendicularly therefrom.

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