# US 12,396,657 B2 · Non-linear single axis navigation sensor with strain relief

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- Number: US 12,396,657 B2
- Document ID: US12396657B2
- Status: Granted
- Kind: B2
- Application number: 17/376,251
- Filed: 2021-07-15
- Published: 2022-11-03
- Granted: 2025-08-26
- Earliest claimed: 2021-04-29
- Assignees: Biosense Webster (Israel) Ltd.
- Applicants: Biosense Webster (Israel) Ltd.
- Inventors: William James Agnew, V; Hamid Massoud; Corey M. Rousu
- Web page: https://patentgrep.com/patent/US12396657B2

## CPC

- A61B 5/062: {using magnetic field}
- A61B 5/6857: {with a distal pigtail shape}
- A61B 5/0538: invasively, e.g. using a catheter
- A61B 5/283: Invasive
- A61B 5/287: Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]
- A61B 5/6851: {Guide wires}
- A61B 5/6852: {Catheters}
- A61B 34/20: Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
- A61B 5/6856: {with a distal loop}
- A61B 2017/00053: {Mapping}
- A61B 2017/00292: {mounted on or guided by flexible, e.g. catheter-like, means}
- A61B 2017/00867: {shape memory effect}
- A61B 2034/2046: {Tracking techniques}
- A61B 2034/2051: {Electromagnetic tracking systems}
- A61B 2562/043: in a linear array
- A61B 2562/187: Strain relief means
- A61B 2562/22: Arrangements of medical sensors with cables or leads; Connectors or couplings specifically adapted for medical sensors
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

The distal end of the catheter can be constructed to include one or more features to provide strain relief to wiring of multiple single axis sensors. In some examples, the multiple single axis sensors and associated wiring can be manufactured over a flexible tube that can be placed over a movable support member. In some examples, wiring can be wound an increased number of consecutive traverse turns on a distal and/or proximal side of a single axis sensor, and a shrink sleeve may be positioned over the traverse turns. In some examples a wire shield transition point can be positioned on a straight portion in a proximal direction to the distal portion of the catheter.

## Claims

### Claim 1

A single axis sensor (SAS) assembly comprising:
a tubular member comprising a lumen therethrough sized to receive an elongated support member suitable for shaping a distal section of a mapping catheter;
a distal inductive coil affixed to the tubular member and coaxial to the tubular member and comprising leads;
a first dual cable electrically joined to the leads of the distal inductive coil and wound over the tubular member and an elbow of the distal section of the mapping catheter;
a proximal inductive coil affixed to the tubular member across the first dual cable, coaxial to the tubular member, and separated from the distal inductive coil such that the distal inductive coil moves in relation to the proximal inductive coil when the tubular member is moved from a linear configuration to a nonlinear configuration; and
an intermediate inductive coil affixed to the tubular member, coaxial to the tubular member, positioned between the distal inductive coil and the proximal inductive coil when the SAS assembly is in the linear configuration, the first dual cable being wound over a distal end of a first protective tube, the first protective tube covering the intermediate inductive coil.

### Claim 2 (depends on 1)

The SAS assembly of claim 1, the nonlinear configuration being approximately circular with a circumference measuring from 24 millimeters 96 millimeters.

### Claim 3 (depends on 1)

The SAS assembly of claim 1, the lumen comprising a diameter measuring from 0.08 mm to 0.3 mm.

### Claim 4 (depends on 1)

The SAS assembly of claim 1, further comprising:
a second dual cable electrically joined to leads of the intermediate inductive coil and wound over the tubular member to cross the proximal inductive coil.

### Claim 5 (depends on 1)

The SAS assembly of claim 1,
the nonlinear configuration being circular, and
the proximal inductive coil, intermediate inductive coil, and distal inductive coil being positioned equidistant around a circumference of the nonlinear configuration.

### Claim 6 (depends on 1)

The SAS assembly of claim 1, the first dual cable being wound for 5 to 7 consecutive traverse turns of 720° around the first protective tube covering the intermediate inductive coil and the tubular member adjacent the distal end of the intermediate inductive coil.

### Claim 7 (depends on 6)

The SAS assembly of claim 6, further comprising:
a second protective tube positioned to completely cover the traverse turns.

### Claim 8 (depends on 1)

The SAS assembly of claim 1, the elbow comprising a diameter of 0.18 inches to 0.26 inches.

### Claim 9 (depends on 1)

The SAS assembly of claim 1, further comprising a shrink sleeve extending over the length of the SAS assembly.

### Claim 10 (depends on 8)

The SAS assembly of claim 8, further comprising:
a shield wire transition point positioned on a straight region of the elongated support member and away from the elbow, the straight region maintaining a straight configuration when the elongated support member moves to the nonlinear configuration.

### Claim 11

A mapping catheter comprising:
an elongated support member extending through a distal section of the mapping catheter and comprising a nonlinear predetermined configuration to which the elongated support member moves when the distal section is disposed within a patient; and
a single axis sensor (SAS) assembly comprising:
a tubular member surrounding the elongated support member,
a distal inductive coil affixed to the tubular member and coaxial to the tubular member,
a proximal inductive coil affixed to the tubular member, coaxial to the tubular member, and separated from the distal inductive coil such that the distal inductive coil moves in relation to the proximal inductive coil when the elongated support member moves to the nonlinear predetermined configuration,
a first dual cable electrically joined to leads of the distal inductive coil and wound over the tubular member to cross the proximal inductive coil, the first dual cable further being wound about an elbow of the distal section of the mapping catheter; and
an intermediate inductive coil affixed to the tubular member, coaxial to the tubular member, positioned between the distal inductive coil and the proximal inductive coil when the elongated support member is linearly elongated, the first dual cable being wound over a distal end of a first protective tube, the first protective tube covering the intermediate inductive coil.

### Claim 12 (depends on 11)

The mapping catheter of claim 11, the intermediate inductive coil positioned such that the proximal inductive coil, intermediate inductive coil, and distal inductive coil collectively function as a three-axis sensor when the elongated support member moves to the nonlinear predetermined configuration.

### Claim 13 (depends on 12)

The mapping catheter of claim 12,
the nonlinear predetermined configuration being circular, and
the proximal inductive coil, intermediate inductive coil, and distal inductive coil being positioned equidistant around a circumference of the nonlinear predetermined configuration.

### Claim 14 (depends on 13)

The mapping catheter of claim 13, the nonlinear predetermined configuration comprising a circumference measuring from 10 millimeters to 50 millimeters.

### Claim 15 (depends on 12)

The mapping catheter of claim 12, the SAS assembly further comprising:
a second dual cable electrically joined to leads of the intermediate inductive coil and wound over the tubular member to cross the proximal inductive coil.

### Claim 16 (depends on 12)

The mapping catheter of claim 12, the first dual cable being wound for 5 to 7 consecutive traverse turns of 720° around the first protective tube covering the intermediate inductive coil and the tubular member adjacent the distal end the tubular member adjacent a side of the respective coil.

### Claim 17 (depends on 16)

The mapping catheter of claim 16, the SAS further comprising a second protective tube positioned to completely cover the traverse turns.

### Claim 18 (depends on 11)

The mapping catheter of claim 11, the elongated support member comprising a memory shape material heat set to the nonlinear predetermined configuration.