Fidus Medical Technology Corporation

David A Grundy

Glen G Warner

R Hardwin Mead

Brian M Packard

A tunable microwave ablation catheter system is disclosed which matches the impedance of its power supply with the transmission line to minimize reflected power and optimize energy delivery to targeted tissues. The tuner itself may be located in the power supply, the transmission line or the antenna. Tuner mechanisms at these locations can change the antenna configuration, move material relative to the antenna or alter the waveguide. A controller monitors the catheter system operation. A method of medical treatment is disclosed where the impedances of the components of the systems are adjusted during use to compensate for impedance variations.

Tunable microwave ablation catheter system and method

A tunable microwave ablation catheter system is disclosed which matches the impedance of its power supply with the transmission line to minimize reflected power and optimize energy delivery to targeted tissues. The tuner itself may be located in the power supply, the transmission line or the antenna. Tuner mechanisms at these locations can change the antenna configuration, move material relative to the antenna, or alter the waveguide. A controller monitors the catheter system operation. A method of medical treatment is disclosed where the impedances of the components of the systems are adjusted during use to compensate for impedance variations.

A medical catheter steering construction is described that is particularly well suited for steering ablation catheters that utilize coaxial transmission lines. An elongated coaxial transmission line is received within a lumen in the flexible tubular member. An antenna is coupled to the center conductor of the coaxial transmission line. A shield termination is secured to the shield portion of the coaxial transmission line. A steering wire that extends through the tubular member to permit a user to steer the catheter during insertion is attached to the shield termination. With this arrangement, when the catheter is inserted into the vessel of a patient, the tip of the catheter may be steered by pulling on the steering wire. In one embodiment of the invention, a distal portion of the tubular member has a stiffness that is significantly less than the stiffness of the majority of the tubular member to facilitate bending during steering. Suitable methods for making such catheters are also described.

Steering mechanism for catheters and methods for making same

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.

Tunable microwave ablation catheter

A tuner system for a microwave power supply used in an ablation catheter system is disclosed. The tuner system includes a tuner arranged to facilitate matching the impedance of a power generator side portion of the catheter system with the impedance of a catheter side portion of the catheter system. A reflected power monitor is also provided for monitoring the amount of power that is reflected from the catheter during use. In a preferred aspect of the invention, the tuner is used in a power supply that includes a microwave power source and is used in conjunction with a catheter having a coaxial transmission line and a helical antenna. In a method aspect of the invention, a method for medical treatment using a microwave ablation catheter system is disclosed.

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Fremont, CA, United States of America

David A Grundy