Surgery – Means for introducing or removing material from body for... – With means for cutting – scarifying – or vibrating tissue
Patent
1997-09-04
2000-02-15
McDermott, Corrine
Surgery
Means for introducing or removing material from body for...
With means for cutting, scarifying, or vibrating tissue
606169, A61B 1720, A61B 1732
Patent
active
060247185
ABSTRACT:
An ultrasound catheter comprises a coaxial cable of electrical conductors with a piezoelectric element at its distal end. The piezoelectric element is shaped and disposed according to the desired ultrasonic field. When an electrical signal from a signal generator is connected to the electrical conductors, the piezoelectric element mechanically deforms in response and generates ultrasonic energy. An alternative embodiment of the present invention is a hollow tubular catheter of flexible polymer has at its distal end a cylindrical piezoelectric element connected to electrical conductors running the length of the catheter. The piezoelectric cylinder may be tapered, segmented, shortened, etc. according to the desired focusing of the ultrasonic field, which is preferably forwardly focused. In either embodiment the catheter is threaded through a patient's vasculature and brought in close proximity to a vascular occlusion. Thrombolytic agents are released from the ultrasonic catheter or a second catheter in close proximity. These agents and ultrasonic energy from the ultrasound catheter result in breakup of the occlusion through sonophoresis.
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Chen Hank H.
Ji Cheng
Dawes Daniel L.
Hayes Michael J.
McDermott Corrine
The Regents of the University of California
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