Tunable microwave ablation catheter
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United States of America Patent
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Apr 11, 1995
Issued Date -
N/A
app pub date -
Dec 3, 1993
filing date -
May 14, 1993
priority date (Note) -
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Abstract
An ablation catheter is disclosed that include a mechanism for altering the impedance of the antenna during use in a controlled manner to tune the catheter. The impedance tuning may be accomplished in a variety of manners including altering the electromechanical configuration of the antenna and moving a material relative to the antenna or vice versa in order to vary the effective impedance during use. In a preferred embodiment, the ablation catheter transmits energy in the microwave frequencies and uses a coaxial transmission line as its waveguide. The antenna is preferably helical in nature and is carried by the distal end of the transmission line.
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