# US 2025/0082901 A1 · Finding elongation of expandable distal end of catheter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0082901 A1 - Document ID: US20250082901A1 - Status: Published application - Kind: A1 - Application number: 18/960,388 - Filed: 2024-11-26 - Published: 2025-03-13 - Earliest claimed: 2018-12-28 - Assignees: Biosense Webster (Israel) Ltd. - Applicants: Biosense Webster (Israel) Ltd. - Inventors: Assaf GOVARI; Avigdor ROSENBERG - Web page: https://patentgrep.com/patent/US20250082901A1 ## CPC - 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} - A61M 25/0105: {Steering means as part of the catheter or advancing means; Markers for positioning (systems for detection of markers A61B)} - A61B 5/062: {using magnetic field} - A61B 5/066: {Superposing sensor position on an image of the patient, e.g. obtained by ultrasound or x-ray imaging} - A61B 5/287: Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS] - A61B 5/6853: {with a balloon} - A61B 5/6858: {with a distal basket, e.g. expandable basket} - A61B 5/6859: {with multiple distal splines} - A61B 34/20: Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis - A61M 25/0074: {Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable} - A61B 2017/00243: {cardiac} - A61B 2034/2051: {Electromagnetic tracking systems} - A61B 2034/2061: {using shape-sensors, e.g. fiber shape sensors with Bragg gratings} - A61B 2560/0223: of calibration, e.g. protocols for calibrating sensors - A61B 2562/0223: Magnetic field sensors - A61M 25/0108: {using radio-opaque or ultrasound markers} - A61M 25/10: Balloon catheters ({A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02;} inflatable balloons for placing stents or stent-grafts A61F2/958 {; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00}) - A61M 2025/0166: {Sensors, electrodes or the like for guiding the catheter to a target zone, e.g. image guided or magnetically guided} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract A computer readable medium comprising instructions to be executed by one or more processors, the instructions configured to cause a system to estimate, based at least in part on signals received from a first position sensor of an expandable assembly disposed along a longitudinal axis, a position and longitudinal direction of the first position sensor; and estimate, based at least in part on signals received from a second position sensor of the expandable assembly, a position of the second position sensor. The instructions are further configured to cause the system to project the estimated position of the second position sensor on an axis defined by the longitudinal direction of the first position sensor and correct the estimated position of the second position sensor by projecting the estimated position of the first position sensor. ## Claims ### Claim 1 A computer readable medium comprising instructions that, when executed by one or more processors, are configured to cause a system to: estimate, based at least in part on signals received from a first position sensor of an expandable assembly, a position and longitudinal direction of the first position sensor, the expandable being assembly disposed along a longitudinal axis; estimate, based at least in part on signals received from a second position sensor of the expandable assembly, a position of the second position sensor; project the estimated position of the second position sensor on an axis defined by the estimated longitudinal direction of the first position sensor; and correct the estimated position of the second position sensor by projecting the estimated position of the second position sensor on the axis. ### Claim 2 (depends on 1) The computer readable medium according to claim 1, the instructions being further configured to cause the system to calculate an elongation of the expandable assembly. ### Claim 3 (depends on 2) The computer readable medium according to claim 2, the instructions being further configured to cause the system to calculate the elongation of the expandable assembly by calculating a distance between the estimated position of the first position sensor and the projected position of the second position sensor. ### Claim 4 (depends on 3) The computer readable medium according to claim 3, wherein, using the calculated elongation, the instructions further cause the system to estimate an ellipticity of the expandable assembly. ### Claim 5 (depends on 3) The computer readable medium according to claim 3, the instructions being further configured to cause the system to, based on the calculated elongation, indicate a degree of elongation of the expandable assembly. ### Claim 6 (depends on 3) The computer readable medium according to claim 3, the instructions being further configured to cause the system to output, to a connected display, a representation of the elongation of the expandable assembly. ### Claim 7 (depends on 1) The computer readable medium according to claim 1, the expandable assembly comprising a balloon catheter. ### Claim 8 (depends on 7) The computer readable medium according to claim 7, the instructions being further configured to cause the system to calculate an elongation of the balloon by calculating a distance between the estimated position of the first position sensor and the projected position of the second position sensor; and based on the calculated elongation, determine an inflation state of the balloon. ### Claim 9 (depends on 7) The computer readable medium according to claim 7, the instructions being further configured to cause the system to determine whether the balloon is in a retracted state; and in response to determining that the balloon is in the retracted state, prevent the balloon from inflating. ### Claim 10 (depends on 1) The computer readable medium according to claim 1, the first position sensor and the second position sensor comprising magnetic sensors. ### Claim 11 (depends on 1) The computer readable medium according to claim 1, the expandable assembly comprising a plurality of spines configured to bow radially outward from the longitudinal axis. ### Claim 12 A computer readable medium comprising instructions that, when executed by one or more processors, are configured to cause a system to: estimate, based at least in part on signals received from a position signal transmitter of an expandable assembly, a position and longitudinal direction of the position signal transmitter, the expandable assembly disposed along a longitudinal axis; estimate, based at least in part on signals received from a position signal receiver disposed on the expandable assembly, a position of the position signal receiver; project an estimated position of the position signal receiver on an axis defined by the estimated longitudinal direction of the position signal transmitter; and correct the estimated position of the position signal receiver by projecting the estimated position of the position signal receiver on the axis. ### Claim 13 (depends on 12) The computer readable medium according to claim 12, the instructions being further configured to cause the system to calculate an elongation of the expandable assembly. ### Claim 14 (depends on 13) The computer readable medium according to claim 13, the instructions being further configured to cause the system to calculate the elongation of the expandable assembly by calculating a distance between the estimated position of the position signal transmitter and the projected position of the position signal transmitter. ### Claim 15 (depends on 13) The computer readable medium according to claim 13, wherein, using the calculated elongation, the instructions further cause the system to estimate an ellipticity of the expandable assembly. ### Claim 16 (depends on 13) The computer readable medium according to claim 13, the instructions being further configured to cause the system to, based on the calculated elongation, indicate a degree of elongation of the expandable assembly. ### Claim 17 (depends on 12) The computer readable medium according to claim 12, the expandable assembly comprising a balloon catheter. ### Claim 18 (depends on 17) The computer readable medium according to claim 17, the instructions being further configured to cause the system to calculate an elongation of the balloon by calculating a distance between the estimated position of the position signal transmitter and the projected position of the position signal receiver; and based on the calculated elongation, determine an inflation state of the balloon. ### Claim 19 (depends on 18) The computer readable medium according to claim 18, the instructions being further configured to cause the system to determine whether the balloon is in a retracted state; and in response to determining that the balloon is in the retracted state, prevent the balloon from inflating. ### Claim 20 (depends on 12) The computer readable medium according to claim 12, the expandable assembly comprising a plurality of spines configured to bow radially outward from the longitudinal axis.