Cauterizing probes for cryosurgery
Cryosurgical apparatus and method
Cryo-ultrasonic surgical instrument
Apparatus for cryosurgery Patent #: 4946460
ApplicationNo. 630532 filed on 12/20/1990
US Classes:606/23, Tip or other cooling concentration means606/21, Internal application606/24With heating means (e.g., defroster)
ExaminersPrimary: Aschenbrenner, Peter A.
Attorney, Agent or Firm
Foreign Patent References
International ClassA61B 017/36
AbstractProbes for medical surgery and flexible catheters for internal tissue ablation in which the tissue cells are frozen and deadened and yet extreme supercooling of tissue below the tissues' melting point is not required. The tissue cells are moderately supercooled by the probe or catheter and freezing of the cells is caused by cavitation nucleation of ice particles within the cells induced by a low power ultrasonic wave generator. The ultrasonic energy causes well distributed nucleation in the supercooled tissue cells and, as a result, the cells rapidly freeze and, due to such freezing, expand and burst their membranes.