Cryogenic surgical instrument
Cryosurgical apparatus and method
Cryosurgical probe Patent #: 5078713
ApplicationNo. 908416 filed on 07/06/1992
US Classes:606/23, Tip or other cooling concentration means606/20, Cyrogenic application606/24With heating means (e.g., defroster)
ExaminersPrimary: Aschenbrenner, Peter A.
Attorney, Agent or Firm
International ClassA61B 017/36
AbstractA closed cycle cryosurgical instrument having a mixed gas assembly that is mounted in a housing and also having a cryosurgical probe unit. By using special (or certain) gas mixtures as opposed to pure gasses, pressure reductions to ≃ or 1/4 of that required by pure gasses can be obtained. The use of gas mixtures with their attendant lower pressures allows for a closed cycle system since expensive and complex multi-stage compressors are not required. With the gas mixtures it is possible to obtain temperatures in the range of liquid nitrogen using a Joule-Thomson based system.