# US 10,375,827 B2 · Circuits for flexible structures

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- Number: US 10,375,827 B2
- Document ID: US10375827B2
- Status: Granted
- Kind: B2
- Application number: 16/260,704
- Filed: 2019-01-29
- Published: 2019-06-06
- Granted: 2019-08-06
- Earliest claimed: 2015-12-08
- Assignees: Kardium Inc.
- Applicants: Kardium Inc.
- Inventors: Daniel Robert Weinkam; Shane Fredrick Miller-Tait; Fernando Luis de Souza Lopes
- Web page: https://patentgrep.com/patent/US10375827B2

## CPC

- H05K 1/028: {Bending or folding regions of flexible printed circuits (H05K1/0283 takes precedence)}
- A61B 5/287: Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]
- A61B 5/361: Detecting fibrillation
- A61B 18/1206: {Generators therefor}
- A61B 18/1492: {having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence)}
- A61N 1/39: Heart defibrillators
- G01K 1/026: {arrangements for monitoring a plurality of temperatures, e.g. by multiplexing}
- G01K 7/16: using resistive elements
- G01K 13/20: Clinical contact thermometers for use with humans or animals
- H05K 1/115: {Via connections; Lands around holes or via connections (H05K1/112 takes precedence)}
- H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence)
- A61B 2018/00267: {having a basket shaped structure}
- A61B 2018/00357: {Endocardium}
- A61B 2018/00577: {Ablation}
- A61B 2018/00702: {Power or energy}
- A61B 2018/00839: {Bioelectrical parameters, e.g. ECG, EEG}
- A61B 2018/00988: {Means for storing information, e.g. calibration constants, or for preventing excessive use, e.g. usage, service life counter}
- A61B 2562/166: the sensor is mounted on a specially adapted printed circuit board
- A61N 1/056: {Transvascular endocardial electrode systems}
- H05K 1/167: {incorporating printed resistors}
- H05K 2201/09681: Mesh conductors, e.g. as a ground plane
- H05K 2201/0979: Redundant conductors or connections, i.e. more than one current path between two points
- H05K 2201/10151: Sensor
- H05K 2201/10507: Involving several components
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)

## Abstract

Some aspects of this disclosure generally are related to improving the robustness of a flexible circuit structure, for example, by providing fault-tolerant electrical pathways for flow of electric current through the flexible circuit structure. In some embodiments, such fault tolerance is enhanced by way of a conductive mesh provided between an adjacent pair of resistive elements. Some aspects are related to improved voltage, current, or voltage and current measurement associated with various pairs of adjacent resistive elements at least when the various pairs have differing distances between them.

## Claims

### Claim 1

A flexible circuit structure comprising:
at least one nonconductive flexible layer comprising an electrically insulative material; and
one or more conductive flexible circuit layers proximate the at least one nonconductive flexible layer, the one or more conductive flexible circuit layers comprising an electrically conductive material, wherein the one or more conductive flexible circuit layers comprises or comprise:
an electric-serial-circuitry-connection-arrangement including a serial-electrical-connection order of a first electrical-load-measurement lead, a first electrical load, a second electrical-load-measurement lead, a third electrical-load-measurement lead, a second electrical load, a fourth electrical-load-measurement lead, a third electrical load, and a fifth electrical-load-measurement lead,
wherein a first distance between the first electrical load and the second electrical load is greater than a second distance between the second electrical load and the third electrical load,
wherein the first electrical-load-measurement lead and the second electrical-load-measurement lead are positioned to sense voltage across, or current flowing through, the first electrical load,
wherein the third electrical-load-measurement lead and the fourth electrical-load-measurement lead are positioned to sense voltage across, or current flowing through, the second electrical load, and
wherein the fourth electrical-load-measurement lead and the fifth electrical-load-measurement lead are positioned to sense voltage or current across the third electrical load.

### Claim 2 (depends on 1)

The flexible circuit structure of claim 1, wherein a first electrical-connection-arrangement spans the first distance between the first electrical load and the second electrical load, wherein a second electrical-connection-arrangement spans the second distance between the second electrical load and the third electrical load, wherein the first electrical-connection-arrangement is electrically connected to the second electrical-load-measurement lead and the third electrical-load-measurement lead, and wherein the second electrical-connection-arrangement is electrically connected to the fourth electrical-load-measurement lead.

### Claim 3 (depends on 2)

The flexible circuit structure of claim 2, wherein an electrical resistance of the first electrical-connection-arrangement is greater than an electrical resistance of the second electrical-connection-arrangement.

### Claim 4 (depends on 2)

The flexible circuit structure of claim 2, wherein at least the first electrical-connection-arrangement or the second electrical-connection-arrangement comprises one or more conductive meshes, each conductive mesh of the one or more conductive meshes including a plurality of conductive segments spatially arranged to provide a plurality of electrical pathways defining a respective portion of an electric current flow path, the respective portion of the electric current flow path located between the first electrical load and the second electrical load for the first electrical-connection-arrangement or between the second electrical load and the third electrical load for the second electrical-connection-arrangement, and each conductive segment of the plurality of conductive segments providing a respective portion of the plurality of electrical pathways.

### Claim 5 (depends on 2)

The flexible circuit structure of claim 2, wherein the first electrical-connection-arrangement and the second electrical-connection-arrangement comprise one or more conductive meshes, each conductive mesh including a respective plurality of conductive segments spatially arranged to provide a respective plurality of electrical pathways between the first electrical load and the second electrical load or between the second electrical load and the third electrical load, and each conductive segment of the respective plurality of conductive segments providing a respective portion of each of at least some of the respective plurality of electrical pathways, and wherein a total of the conductive meshes comprised by the first electrical-connection-arrangement is greater than a total of the conductive meshes comprised by the second electrical-connection-arrangement.

### Claim 6 (depends on 2)

The flexible circuit structure of claim 2, wherein each of the first electrical-connection-arrangement and the second electrical-connection-arrangement comprises one or more conductive meshes, each conductive mesh including a respective plurality of conductive segments spatially arranged to provide a respective plurality of electrical pathways between the first electrical load and the second electrical load for the first electrical-connection-arrangement and between the second electrical load and the third electrical load for the second electrical-connection-arrangement, and each conductive segment of the respective plurality of conductive segments providing a respective portion of each of at least some of the respective plurality of electrical pathways, and wherein each conductive mesh is directly connected to a respective one of the second electrical-load-measurement lead, the third electrical-load-measurement lead, and the fourth electrical-load-measurement lead.

### Claim 7 (depends on 2)

The flexible circuit structure of claim 2, wherein each of the first electrical load, the second electrical load, and the third electrical load is a temperature sensor, wherein the one or more conductive flexible circuit layers comprises a plurality of conductive flexible circuit layers, and wherein at least the first electrical-connection-arrangement or the second electrical-connection-arrangement electrically connects at least a respective adjacent pair of temperature sensors of the temperature sensors by at least one via arranged to electrically connect different ones of the plurality of conductive flexible circuit layers.

### Claim 8 (depends on 1)

The flexible circuit structure of claim 1, wherein the at least one nonconductive flexible layer comprises a plurality of electrically nonconductive flexible layers, and the one or more conductive flexible circuit layers comprises a plurality of conductive flexible circuit layers that are interleaved with the plurality of electrically nonconductive flexible layers.

### Claim 9 (depends on 1)

The flexible circuit structure of claim 1, wherein each of the first electrical load, the second electrical load, and the third electrical load is provided at least in part by a respective one of a plurality of temperature sensors.