초록 ▼

Radiofrequency (RF) heating applicator, located at the distal end of a coaxial line catheter, produces deeper and more uniform heat dissipation. The active applicator element is a conductor helix fed via the coaxial line. The applicator has provisions for interception of intracardiac electrogram sig

Radiofrequency (RF) heating applicator, located at the distal end of a coaxial line catheter, produces deeper and more uniform heat dissipation. The active applicator element is a conductor helix fed via the coaxial line. The applicator has provisions for interception of intracardiac electrogram signal. A cardiac ablation system using the above catheter, ablates cardiac tissue responsible for ventricular tachycardia. The ablation system provides means to monitor intracardiac electrograms and to control the RF power. A variation of the helical applicator can be used in a hyperthermia system for treatment of malignant tumors.

대표청구항 ▼

A radiofrequency (RF) heating and monitoring applicator connected to an RF energy source and an intracardiac electrogram monitor, and comprising a transmission line having a proximal end connected to the RF energy source and to said monitor and further having a distal end; a solenoidal antenna at sa

A radiofrequency (RF) heating and monitoring applicator connected to an RF energy source and an intracardiac electrogram monitor, and comprising a transmission line having a proximal end connected to the RF energy source and to said monitor and further having a distal end; a solenoidal antenna at said distal end of said transmission line commensurate with the transmission line in diameter; at least one monitoring electrode carried on said antenna; and coupling means for connection of said solenoidal antenna to said monitoring electrode and to the transmission line for providing efficient coupling of RF energy from the RF energy source through the transmission line to the solenoidal antenna and for transmitting lower frequency intracardiac potential intercepted by said at least one monitoring electrode to said proximal end of the transmission line.