US 12,472,001 B2
Cryogenic treatment device encoder
Bret Herscher, Cupertino, CA (US); Bruce Ackerman, Fairfax, CA (US); and William Malecki, Oakland, CA (US)
Assigned to Channel Medsystems, Inc., Berkeley, CA (US)
Filed by Channel Medsystems, Inc., Berkeley, CA (US)
Filed on Feb. 9, 2021, as Appl. No. 17/171,467.
Prior Publication US 2022/0249173 A1, Aug. 11, 2022
Int. Cl. A61B 34/20 (2016.01); A61B 17/00 (2006.01); A61B 18/00 (2006.01); A61B 18/02 (2006.01)
CPC A61B 34/20 (2016.02) [A61B 18/00 (2013.01); A61B 18/02 (2013.01); A61B 2017/0003 (2013.01); A61B 2018/00196 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/0091 (2013.01); A61B 2034/2053 (2016.02); A61B 2034/2059 (2016.02)] 17 Claims
OG exemplary drawing
 
1. A treatment system, comprising:
a handle;
an elongate shaft projecting from the handle;
a sheath axially slidable relative to the elongate shaft;
an electrode mounted on a proximal portion of the sheath;
a substrate located within the handle, wherein the substrate comprises an elongate portion;
a plurality of first capacitive sensors positioned along the elongate portion, each of the first capacitive sensors being aligned linearly and having a first length;
a plurality of second capacitive sensors positioned along the elongate portion adjacent to the plurality of first capacitive sensors, each of the second capacitive sensors being aligned linearly and having a second length which is less than the first length,
wherein the electrode is configured to slide along the elongate portion during movement of the sheath while maintaining contact with at least one of the first capacitive sensors and at least one of the second capacitive sensors during movement of the sheath; and
wherein the substrate is configured to determine an axial position of the electrode based on a coupling capacitance caused by the electrode overlapping one or more of the first capacitive sensors and one or more of the second capacitive sensors.