# US 12,594,402 B2 · Catheter with serially connected sensing structures and methods of calibration and detection

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- Number: US 12,594,402 B2
- Document ID: US12594402B2
- Status: Granted
- Kind: B2
- Application number: 18/766,370
- Filed: 2024-07-08
- Published: 2024-10-31
- Granted: 2026-04-07
- Earliest claimed: 2012-12-31
- Assignees: Biosense Webster (Israel) Ltd.
- Applicants: Biosense Webster (Israel) Ltd.
- Inventors: Jeffrey L. Clark; George Kamin; Mark Stanley
- Web page: https://patentgrep.com/patent/US12594402B2

## CPC

- A61M 25/0127: {Magnetic means; Magnetic markers}
- A61B 5/05: Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves (measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24)
- 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 5/72: {Signal processing specially adapted for physiological signals or for diagnostic purposes}
- A61B 18/1206: {Generators therefor}
- A61B 18/1492: {having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence)}
- A61B 5/6885: {Monitoring or controlling sensor contact pressure}
- A61B 2018/00357: {Endocardium}
- A61B 2018/00577: {Ablation}
- A61B 2034/2051: {Electromagnetic tracking systems}
- A61B 2090/065: {for measuring contact or contact pressure}
- A61M 2025/0002: {with a pressure sensor at the distal end}
- 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)}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A catheter is responsive to external and internal magnetic field generators for generating signals representing position and pressure data, with a reduced number of sensing coil leads for minimizing lead breakage and failure. The catheter includes a flexible joint with pressure sensing and position coils, at least pair of a pressure sensing coil and a position coil are serially connected. Methods of calibrating a catheter for position and pressure sensing, and detecting magnetic field interference with one catheter by another catheter or other metal or ferrous object advantageously use signals between two sets of sensors as a “back up” or “error check”.

## Claims

### Claim 1

A method of calibrating a first catheter for detecting interference with magnetic field sensing caused by presence of a second catheter or other metal or ferrous object, comprising:
providing the first catheter with a first sensor configured to respond to a magnetic field generated by an internal field generator internal to the first catheter, and a second sensor configured to respond to the magnetic field generated by the internal field generator internal to the first catheter and to an external magnetic field generated by one or more external field generators;
applying forces of axial displacement and angular deflection on the first catheter while driving the internal field generator to enable the first sensor to generate first calibration signals;
driving the internal field generator to enable the second sensor to generate second calibration signals indicative of absence of interference from the second catheter or the other metal or ferrous object;
calibrating the first calibration signals from the first sensor to create a first calibration file; and
calibrating the second calibration signals from the second sensor to create a second calibration file.

### Claim 2

A method of detecting interference with magnetic field sensing in a first catheter caused by presence of a second catheter or other metal or ferrous object, comprising:
providing the first catheter with a first sensor configured to respond to a magnetic field generated by an internal field generator internal to the first catheter, and a second sensor configured to respond to the magnetic field generated by the internal field generator internal to the first catheter and to an external magnetic field generated by one or more external field generators;
applying forces of axial displacement and angular deflection on the first catheter while driving the internal field generator to enable the first sensor to generate first calibration signals;
driving the internal field generator to enable the second sensor to generate second calibration signals indicative of absence of interference from the second catheter or the other metal or ferrous object;
calibrating the first calibration signals to create a first calibration file;
calibrating the second calibration signals from the second sensor to create a second calibration file;
storing the first and second calibration files in memory;
when the catheter is in use, driving the internal field generator to enable the first and second sensors to generate data signals; and
comparing the data signals from the second sensor to the second calibration signals in the second calibration file.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
determining whether a discrepancy exists between the data signals of the second sensor and the second calibration signals in the second calibration file; and
where a discrepancy is determined, providing an indication to a user of the discrepancy.

### Claim 4 (depends on 2)

The method of claim 2, wherein the indication comprises an audio or visual alarm.

### Claim 5 (depends on 2)

The method of claim 2, wherein the first sensor comprises a plurality of first sensors.

### Claim 6 (depends on 2)

The method of claim 2, wherein the first sensor comprises three first sensors.

### Claim 7 (depends on 2)

The method of claim 2, wherein the first sensor is configured to generate signals representative of pressure.

### Claim 8 (depends on 5)

The method of claim 5, wherein one or more of the plurality of first sensors is configured to generate signals representative of pressure.

### Claim 9 (depends on 2)

The method of claim 2, wherein the second sensor comprises a plurality of second sensors.

### Claim 10 (depends on 2)

The method of claim 2, wherein the second sensor comprises two second sensors.

### Claim 11 (depends on 2)

The method of claim 2, wherein the second sensor is configured to generate signals representative of position.

### Claim 12 (depends on 9)

The method of claim 9, wherein one or more of the plurality of second sensors is configured to generate signals representative of position.

### Claim 13 (depends on 5)

The method of claim 5, wherein the second sensor comprises a plurality of second sensors.

### Claim 14 (depends on 13)

The method of claim 13, wherein at least one of the plurality of first sensors is serially connected to one of the plurality of second sensors by a common lead.

### Claim 15 (depends on 13)

The method of claim 13, wherein:
a first one of the plurality of first sensors and a first one of the plurality of second sensors are serially connected by a first common lead; and
a second one of the plurality of first sensors and a second one of the plurality of second sensors are serially connected by a second common lead.

### Claim 16 (depends on 6)

The method of claim 6, wherein the second sensor comprises two second sensors.

### Claim 17 (depends on 16)

The method of claim 16, wherein:
a first one of the three first sensors and a first one of the two second sensors are serially connected by a first common lead; and
a second one of the three first sensors and a second one of the two second sensors are serially connected by a second common lead.

### Claim 18 (depends on 15)

The method of claim 15, further comprising deconvolving signals received via the first and second common leads.

### Claim 19 (depends on 16)

The method of claim 16, further comprising deconvolving signals received via the first and second common leads.