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US 6,585,728 B2Granted
Cryoablation catheter with an improved gas expansion chamber
AssigneeBiosense Webster, Inc.
InventorsPeter Wilfred Heiner, Bart-Jan Korteling
Life of this patent
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Abstract
A cryoablation catheter having a high efficiency gas expansion chamber comprised of a generally cylindrical or hemispherical cooling chamber having a wall thickness equal to approximately one half the wall thickness of the walls of the catheter in order to provide a cooling chamber increased with large gas expansion volume and having thin walls for rapid cooling of the outside surface of the cooling chamber.
Claims10
A cryoablation catheter comprising:
- an elongated flexible outer tubular member having a lumen extending throughout the length of the tubular member and having a proximal and distal end and an inside and outside diameter;
- an inner tubular member extending throughout the length of the outer tubular member and having a proximal end adapted to be coupled to a source of cryoablation fluid;
- a generally cylindrical fluid expansion cooling chamber bonded to the distal end of the outer tubular member and being in fluid engagement with the lumen of the outer tubular member, and having an inside diameter substantially greater than the inside diameter of the outer tubular member and an outside diameter substantially equal to the outside diameter of the outer tubular member;
- and,
- a fluid expansion nozzle disposed on the distal end of the inner tubular member and extending into the cooling chamber so that when a cooling fluid is supplied to the proximal end of the inner tubular member the fluid is caused to expand at the nozzle to thereby cause cooling to occur within the cooling chamber.
2 more elements
Dependencies are inferred from the claim text.