US 9,808,302 B2
Phase separation of cryogen in cryosurgical instrument
Nir Berzak, Tel Aviv (IL); and Ron Hilleli, Zichron Yaacov (IL)
Assigned to ICECURE MEDICAL LTD., Caesarea (IL)
Appl. No. 15/125,258
Filed by ICECURE MEDICAL LTD., Caesarea (IL)
PCT Filed Nov. 6, 2014, PCT No. PCT/US2014/064292
§ 371(c)(1), (2) Date Sep. 12, 2016,
PCT Pub. No. WO2015/138010, PCT Pub. Date Sep. 17, 2015.
Application 15/125,258 is a continuation of application No. 14/204,175, filed on Mar. 11, 2014, granted, now 8,906,004.
Prior Publication US 2017/0100184 A1, Apr. 13, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 18/02 (2006.01)
CPC A61B 18/02 (2013.01) [A61B 2018/0212 (2013.01); A61B 2018/0281 (2013.01); A61B 2018/0287 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A cryosurgical instrument comprising:
a shaft having a closed distal end defining an expansion chamber and an open proximal end adapted and configured (i) to receive an inflow of cryogen and (ii) to exhaust a flow of expanded cryogen; and
a heat exchanger comprising:
a solid core element extending along a longitudinal axis of the heat exchanger; and
a cryogen delivery tube that spirals around and contacts the solid core element,
wherein the spirals of the cryogen delivery tube are spaced from each other and in fluid tight contact with the core and an inner surface of the shaft so as to form a spiraling cryogen exhaust pathway, and
wherein cryogen spins as it travels through the delivery tube to the expansion chamber and as it travels around the delivery tube from the chamber.