Closed loop catheter coolant system

  • US 7,303,554 B2
  • Filed: 01/26/2004
  • Issued: 12/04/2007
  • Est. Priority Date: 01/25/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A cryoablation system comprising a cryotreatment catheter and a coolant console having:

  • an inlet line;

    a reservoir of phase change coolant;

    a supply line for supplying phase change coolant;

    a first means coupled to the supply line for providing the phase change coolant from the reservoir at elevated pressure along the inlet line to the cryotreatment catheter, wherein the first means conditions temperature of the coolant at elevated pressure in the inlet line;

    a second means for recovering the phase change coolant from the cryotreatment catheter and raising its pressure;

    said first and second means, a portion of said supply line, and said cryotreatment catheter forming a supply loop external to the reservoir, the supply loop passing through the cryotreatment catheter, the first means being arranged in heat exchange communication with the supply line to condition the phase change coolant before it reaches the catheter along the inlet line so as to achieve effective cooling regimens by controlling phase change coolant provided along the inlet line while continuously recovering and recirculating expended coolant from the second means,a pressure regulator for controlling flow of coolant between the inlet line and the catheter, anda control microprocessor coupled to the pressure regulator and configured for setting the pressure regulator to effect a treatment cycle.

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