Precooled cryogenic ablation system

  • US RE40,049 E1
  • Filed: 04/26/2006
  • Issued: 02/12/2008
  • Est. Priority Date: 06/25/1999
  • Status: Expired due to Fees
First Claim
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1. A cryosurgical instrument for ablation of endocardiac tissue, comprising:

  • a source of a gaseous primary refrigerant said source providing said primary refrigerant at a temperature above the critical temperature of said primary refrigerant;

    a source of a liquid secondary refrigerant, said secondary refrigerant having a critical temperature higher than said critical temperature of said primary refrigerant;

    a secondary expansion element connected to receive said liquid secondary refrigerant, said secondary expansion element being constructed to vaporize and expand said secondary refrigerant to a temperature below said critical temperature of said primary refrigerant;

    a primary-to-secondary heat exchanger having a primary refrigerant flow path connected to receive said gaseous primary refrigerant, and a secondary refrigerant flow path connected to receive said vaporized and expanded secondary refrigerant from said secondary expansion element, said heat exchanger being constructed to cool and liquefy said primary refrigerant;

    a primary expansion element connected to receive said liquid primary refrigerant from said heat exchanger, said primary expansion element being constructed to vaporize and expand said primary refrigerant to a selected cryogenic temperature; and

    a cryoablation heat transfer element connected to receive said vaporized and expanded primary refrigerant;

    wherein said primary refrigerant comprises SUVA-95, and said secondary refrigerant comprises AZ-20.

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