# US 11,439,318 B2 · Active magnetic position sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,439,318 B2 - Document ID: US11439318B2 - Status: Granted - Kind: B2 - Application number: 17/092,742 - Filed: 2020-11-09 - Published: 2021-02-25 - Granted: 2022-09-13 - Earliest claimed: 2015-06-03 - Assignees: St. Jude Medical, Cardiology Division, Inc. - Applicants: St. Jude Medical, Cardiology Division, Inc. - Inventors: Gregory K. Olson; Troy T. Tegg; Andrew R. Oliverius; Zachary L. Helgeson - Web page: https://patentgrep.com/patent/US11439318B2 ## CPC - A61B 5/062: {using magnetic field} - A61B 5/065: {Determining position of the probe employing exclusively positioning means located on or in the probe, e.g. using position sensors arranged on the probe} - A61B 5/6852: {Catheters} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An medical device, comprising an elongate shaft extending along a shaft longitudinal axis and comprising a shaft proximal portion and a shaft distal portion that is sized and configured for insertion into a body. An active magnetic position sensor can be disposed within the shaft distal portion. ## Claims ### Claim 1 A catheter tip assembly, comprising: a proximal stem that comprises a lumen; an electrode wall that comprises a center cavity, the electrode wall coupled to a distal end of the proximal stem, and wherein the electrode wall is configured to distribute energy to a tissue; an electrode cap coupled to a distal end of the electrode wall, the electrode cap defining an electrode pocket in a distal face of the electrode cap; and an elongate thermocouple extending through the lumen of the proximal stem and the center cavity and into the electrode pocket defined by the electrode cap, wherein: the elongate thermocouple is turned around a portion of a longitudinal axis defined by the catheter tip assembly, a distal end of the elongate thermocouple is disposed in the electrode pocket at a non-zero angle with respect to the longitudinal axis defined by the catheter tip assembly, the elongate thermocouple distributes a biasing force over the turned portion of the elongate thermocouple, and application of a force to the electrode cap causes the electrode wall and the elongate thermocouple to flex. ### Claim 2 (depends on 1) The catheter tip assembly of claim 1, wherein the turned portion of the elongate thermocouple is turned in a helical shape around the portion of the longitudinal axis. ### Claim 3 (depends on 1) The catheter tip assembly of claim 1, wherein: a catheter shaft is coupled to a proximal end of the proximal stem; and the elongate thermocouple extends from the electrode cap through a lumen of the catheter shaft. ### Claim 4 (depends on 1) The catheter tip assembly of claim 1, wherein the elongate thermocouple is turned around the portion of the longitudinal axis between the distal end of the proximal stem and a proximal end of the electrode cap. ### Claim 5 (depends on 1) The catheter tip assembly of claim 1, further comprising a coil that extends between the distal end of the proximal stem and the proximal end of the electrode cap. ### Claim 6 (depends on 5) The catheter tip assembly of claim 5, wherein the coil has a spring force in a range of 15 to 100 grams. ### Claim 7 (depends on 1) The catheter tip assembly of claim 1, wherein the elongate thermocouple is adhered to the electrode cap and the proximal stem. ### Claim 8 (depends on 1) The catheter tip assembly of claim 1, wherein the elongate thermocouple is inserted within a lumen of a formed polymer tube, wherein a distal end of the formed polymer tube is located within the electrode pocket in the electrode cap. ### Claim 9 (depends on 1) The catheter tip assembly of claim 1, further comprising an active magnetic position sensor disposed in the proximal stem. ### Claim 10 A catheter, comprising: an electrode wall that comprises a center cavity, wherein the electrode wall is configured to distribute energy to a tissue; an electrode cap coupled to a distal end of the electrode wall, the electrode cap defining an electrode pocket in a distal face of the electrode cap; an elongate thermocouple turned around a portion of a longitudinal axis defined by the catheter; and a fluid lumen manifold, wherein: the elongate thermocouple is turned around the fluid lumen manifold, the elongate thermocouple is disposed adjacent to the fluid lumen manifold in the center cavity, the elongate thermocouple is disposed in the electrode pocket at a non-zero angle with respect to the longitudinal axis defined by the catheter tip assembly, application of a force to the electrode cap causes the electrode wall and the elongate thermocouple disposed adjacent to the fluid lumen manifold to flex. ### Claim 11 (depends on 10) The catheter of claim 10, further comprising a proximal stem coupled to a proximal end of the electrode wall. ### Claim 12 (depends on 11) The catheter of claim 11, further comprising a catheter shaft coupled to a proximal end of the proximal stem, wherein the elongate thermocouple extends through the catheter shaft to a proximal end of the catheter shaft, and wherein an active magnetic position sensor is disposed in the catheter shaft. ### Claim 13 A catheter tip assembly comprising: an electrode wall that comprises a center cavity, wherein the electrode wall is configured to distribute energy to a tissue; an elongate thermocouple turned around a portion of a longitudinal axis defined by the catheter tip assembly; a fluid lumen manifold, wherein; the elongate thermocouple is turned around the fluid lumen manifold, a diameter at which the elongate thermocouple is turned around the fluid lumen manifold is between an outer diameter of the fluid lumen manifold and an inner diameter of the electrode wall, and application of a force to the electrode wall causes the electrode wall and the elongate thermocouple to flex; and an electrode cap, wherein the electrode cap comprises an electrode pocket formed in a distal face of the electrode cap, wherein a most distal end of the elongate thermocouple is disposed in the electrode pocket, at a non-zero angle with respect to the longitudinal axis of the catheter tip assembly. ### Claim 14 (depends on 13) The catheter tip assembly of claim 13, wherein the elongate thermocouple is turned around the portion of the longitudinal axis in a range from 0.2 to 1 turn. ### Claim 15 (depends on 13) The catheter tip assembly of claim 13, wherein the elongate thermocouple is turned in a spiral shape around the portion of the longitudinal axis. ### Claim 16 (depends on 13) The catheter tip assembly of claim 13, further comprising an active magnetic position sensor.