HIGH RESOLUTION ELECTRODE RING MAPPING AND ABLATION CATHETER
Publication Date: 2009-Jul-14
The IP.com Prior Art Database
The present invention is directed to an RF ablation catheter that includes small diagnostic sensing electrode rings (micro electrode rings) embedded within the ablation tip. These micro electrode rings are electrically isolated from the ablation tip using a polymer base material sleeve and/or adhesive. Due to the size and proximity of the micro electrode rings, highly localized electrical activity recordings can be obtained at the point of contact between the ablation tip and target tissue, while avoiding far field electrical potentials that are typically associated with tip-to-ring electrode bipolar recording. Thus, the shape, size, and relatively close proximity of the electrode rings greatly increase the mapping fidelity while retaining the ability to ablate target tissue.
In one embodiment, shown in Figs. 1A and 1B, an ablation catheter tip 10 constructed in accordance with the present invention includes a proximal tip portion 12 attached to a distal tip portion 14 by press fitting, bonding, or the like. Ring electrodes 16 are disposed within a circumferential space 18 between the distal and proximal tip portions 14 and 12. The ring electrodes 16 are electrically isolated from the distal and proximal tip portions 14 and 12 by a polymer sleeve 20. The sleeve 20 comprises a base layer 22 (shown in Fig. 1B) and an upper layer 24, which may be a unitary piece or may be formed as separate pieces and then bonded together.
As shown in Fig. 1B, a central lumen 26 extends through the catheter tip 10 for accommodating the passage of respective electrode leads 28 and a thermocouple lead 30. The electrode leads 28 extend from the central lumen 26, through electrode lead lumens 32 in communication with t...