Conformal positioning assembly for microwave ablation catheter

Details Conformal positioning assembly for microwave ablation catheter Conformal positioning assembly for microwave ablation catheter

1996-10-16

1998-09-22

Cohen, Lee

Surgery

Instruments

Electrical application

606 41, 607101, 607156, A61B 1739, A61N 502

Patent

active

058108033

ABSTRACT:
An ablation catheter includes an elongated flexible tubular member adapted to be inserted into a vessel in the body of a patient. A transmission line is disposed within the tubular member and a transducer is coupled to the transmission line for generating an electric field sufficiently strong to cause tissue ablation. A shape memory wire is positioned at a distal portion of the catheter adjacent the transducer to facilitate straightening the catheter tip after use. In one preferred embodiment, the shape memory wire may a flat wire which is formed from copper beryllium, a steel alloy, or nickel titanium. In another embodiment, the transmission line of the catheter is a coaxial cable, and the transducer is a helical antenna coil that is adapted to radiate electromagnetic energy in the microwave frequency range. In yet another embodiment, the shape memory wire is positioned within the antenna coil. Methods for manufacturing and using such ablation catheters are also described.

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Landberg et al., "Catheter Ablation of the Atrioventricular Junction Using a Helical Microwave Antenna: A Novel Means of Coupling Energy to the Endocardium", vol. 14, Dec. 1991, pp. 2105-2113.

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