US 11,849,989 B2
Cryogenic system and methods
John G. Baust, Candor, NY (US); John M. Baust, Owego, NY (US); and Anthony T. Robilotto, Binghamton, NY (US)
Assigned to Varian Medical Systems, Inc., Palo Alto, CA (US)
Filed by Varian Medical Systems, Inc., Palo Alto, CA (US)
Filed on May 10, 2021, as Appl. No. 17/316,073.
Application 17/316,073 is a continuation of application No. 14/213,441, filed on Mar. 14, 2014, granted, now 11,026,737.
Claims priority of provisional application 61/956,168, filed on Mar. 15, 2013.
Prior Publication US 2021/0322082 A1, Oct. 21, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 18/02 (2006.01); A61B 18/00 (2006.01)
CPC A61B 18/02 (2013.01) [A61B 2018/00023 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/0212 (2013.01); A61B 2018/0262 (2013.01); A61B 2018/0293 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A cryogenic system for cooling an exterior surface of a cryoprobe comprising:
a dewar containing a liquid nitrogen bath; and
at least one cryoengine comprising:
a first tank positioned at least partially in the dewar and comprising one or more heating elements;
a second tank disposed outside of the dewar, the second tank comprising an exterior surface that is insulated; and
a tank conduit fluidly connecting the first tank to the second tank;
wherein at least a portion of the exterior surface of the second tank is in direct contact with a heat source.