# US 8,571,626 B2 · Mono-phasic action potential electrogram recording catheter, and method

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- Number: US 8,571,626 B2
- Document ID: US8571626B2
- Status: Granted
- Kind: B2
- Application number: 13/604,139
- Filed: 2012-09-05
- Published: 2013-01-03
- Granted: 2013-10-29
- Earliest claimed: 2009-07-29
- Assignees: Medtronic Ablation Frontiers LLC
- Applicants: Michael Lau; Randell L. Werneth; Timothy J. Corvi; Sumita Bhola; Mark T. Stewart; Michel Haissaguerre; Meleze Hocini
- Inventors: Michael Lau; Randell L. Werneth; Timothy J. Corvi; Sumita Bhola; Mark T. Stewart; Michel Haissaguerre; Meleze Hocini
- Web page: https://patentgrep.com/patent/US8571626B2

## CPC

- A61B 5/283: Invasive
- A61B 5/6858: {with a distal basket, e.g. expandable basket}
- A61N 1/06: for high-frequency therapy
- A61B 18/1492: {having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence)}
- A61B 2018/00214: {Expandable means emitting energy, e.g. by elements carried thereon}
- A61B 2018/00839: {Bioelectrical parameters, e.g. ECG, EEG}
- A61B 2018/00898: {Alarms or notifications created in response to an abnormal condition}
- 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)

## Abstract

Catheters and methods for obtaining monophasic action potential (“MAP”) electrograms include a flexible catheter body defining a longitudinal axis, and a distal assembly affixed to the catheter body distal end defining a distal tip. The distal assembly has at least three MAP recording electrodes, and at least one reference electrode for determining reference potential. The recording electrodes are each positioned a radial distance from the longitudinal axis in at least three different radial directions, defining a recording geometry substantially having radial symmetry. The reference electrode is a longitudinal distance from the recording geometry. Optional features include a steerable catheter shaft, one or more radio-frequency ablation electrodes, and a dedicated pacing electrode. Different possible embodiments include a dome housing having the recording electrodes in a fixed spatial arrangement, and a distal loop assembly having an array of electrodes on at least three flexible loop elements.

## Claims

### Claim 1

A medical device, comprising:
a catheter body having proximal and distal ends, and defining a longitudinal axis;
a distal assembly affixed to the distal end of the catheter body, the distal assembly including at least three flexible arms, each arm having a proximal portion and a distal portion and extending radially outward from a position at or near the longitudinal axis, the distal portions of the arms meeting at a distal tip being located at or near a point along the longitudinal axis;
at least three monophasic action potential electrogram recording electrodes, each recording electrode being positioned a radial distance from the longitudinal axis in different radial directions; and
at least one reference electrode positioned distal of the distal end of the catheter body, proximal of at least one of the at least three monophasic action potential electrogram recording electrodes, and a longitudinal distance from each recording electrode,
wherein the recording electrodes are radially symmetric about the longitudinal axis.

### Claim 2 (depends on 1)

The medical device of claim 1, wherein the proximal portion and distal portion of each arm are connected to each other with a living hinge.

### Claim 3 (depends on 1)

The medical device of claim 1, further comprising at least three ablation electrodes, wherein at least one of the recording electrodes and at least one of the ablation electrodes are affixed to one of the proximal portion and distal portion of each arm.

### Claim 4

A medical device, comprising:
a catheter body having proximal and distal ends, and defining a longitudinal axis;
a distal assembly affixed to the distal end of the catheter body, having at least three flexible arms extending radially outward in different radial directions from positions at or near the longitudinal axis, and a monophasic action potential electrogram recording electrode affixed to each arm; and
at least one reference electrode positioned a longitudinal distance from each recording electrode,
each arm having a proximal portion and a distal portion, proximal portion and distal portion being connected with a living hinge, and the distal portions of the arms meeting at a distal tip being located at or near a point along the longitudinal axis; and
each of the recording electrodes being affixed to one of the proximal portion and distal portion of an arm at a radial distance from the longitudinal axis, the at least one reference electrode being positioned on the proximal portion of an arm when each of the recording electrodes are affixed to the distal portion of an arm and being positioned on the distal portion of an arm when each of the recording electrodes are affixed to the proximal portion of an arm; each arm having at least one recording electrode, the recording electrodes being substantially radially symmetric about the longitudinal axis.

### Claim 5 (depends on 4)

The medical device of claim 4, further comprising at least three ablation electrodes, wherein the recording electrodes and ablation electrodes are affixed to the distal portion of each arm, such that the distal portions of the arms are adapted to be pushed distally toward the tissue to be treated.

### Claim 6 (depends on 4)

The medical device of claim 4, further comprising at least three ablation electrodes, wherein the recording electrodes and ablation electrodes are affixed to the proximal portion of each arm, such that the distal assembly is adapted to be pushed past distally-facing tissue to be treated, and the proximal portions of the arms are adapted to be pulled proximally toward the tissue to be treated.

### Claim 7 (depends on 4)

The medical device of claim 4, further comprising at least three ablation electrodes, wherein the ablation electrodes are affixed to one of the proximal portion and the distal portion of each arm, the ablation electrodes further comprising a fin extending toward the other portion of arm to which the ablation electrodes are affixed, the fins enhancing dissipation of heat from the ablation electrodes.