Surgery – Truss – Pad
Patent
1975-09-09
1977-04-05
Pace, Channing L.
Surgery
Truss
Pad
62293, A61B 1736
Patent
active
040156060
ABSTRACT:
A cryosurgical probe has a refrigerant supply conduit for conducting refrigerant to the hollow thermally-conductive probe tip. A refrigerant exhaust conduit extends through the probe into the tip and the end of the exhaust conduit in the tip is positioned a selected distance proximally of the end of the supply conduit. Thus, when refrigerant flows through the supply conduit to the tip, it tends to follow a flow path taking it more or less directly to the exhaust conduit. This creates a dead gas space inside the tip proximally of the end of the exhaust conduit, thereby minimizing direct cooling of portions of the probe adjacent to and proximally of the dead gas space and confining the freeze zone distal to that space. By adjusting the height of the exhaust conduit end proximally of the supply conduit end, the size of the freeze zone at the tip can be controlled. Further, if the probe has a defrost mode, defrost is enhanced because only the working end of the tip need be warmed.
REFERENCES:
patent: 3502081 (1970-03-01), Amoils
patent: 3782386 (1974-01-01), Barger et al.
patent: 3910277 (1975-10-01), Zimmer
patent: 3913581 (1975-10-01), Ritson et al.
Mitchiner Robert K.
Russell Wayne A.
Dynatech Corporation
Pace Channing L.
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