Effective parasitic capacitance minimization for micro ablation electrode
AssigneeBiosense Webster (Israel) Ltd.
InventorYOAV LICHTENSTEIN
Life of this patent
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Abstract
A flexible catheter has an ablation electrode disposed in its distal segment. The ablation electrode a cavity formed in its external surface, a microelectrode configured to fit into the cavity, a conductive wire lead connecting the microelectrode to receiving circuitry, and an electrical shield surrounding the wire lead. A power generator is connected to the ablation electrode and the electrical shield in a generator circuit. A back patch electrode adapted to contact with the subject is connected in the generator circuit. The microelectrodes can be active while energizing the ablation electrode.
Claims16
An apparatus, comprising:
- a flexible catheter adapted for insertion into a heart of a living subject and having a distal segment;
- an ablation electrode disposed at the distal segment to be brought into contact with a target tissue in the heart;
- the ablation electrode having an external surface, and a cavity formed in the external surface;
- a microelectrode configured to fit into the cavity;
- a conductive wire lead connecting the microelectrode to receiving circuitry;
- and
- an electrical shield surrounding the wire lead.
A method, comprising the steps of::
- inserting a flexible catheter into a heart of a living subject, the catheter having a distal segment, an ablation electrode disposed at the distal segment;
- the ablation electrode having an external surface;
- forming a cavity in the external surface;
- fitting a microelectrode into the cavity;
- connecting a conductive wire lead to the microelectrode and to receiving circuitry;
- placing an electrical shield surrounding the wire lead;
- contacting the ablation electrode with a target tissue in the heart;
- and
- while receiving signals from the microelectrode in the receiving circuitry energizing the ablation electrode to ablate the target tissue.
Dependencies are inferred from the claim text.