# US 7,263,397 B2 · Method and apparatus for catheter navigation and location and mapping in the heart

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- Number: US 7,263,397 B2
- Document ID: US7263397B2
- Status: Granted
- Kind: B2
- Application number: 10/819,027
- Filed: 2004-04-06
- Published: 2004-12-16
- Granted: 2007-08-28
- Earliest claimed: 1998-06-30
- Assignees: St. Jude Medical, Atrial Fibrillation Division, Inc.
- Inventors: John A. Hauck; Jeff A. Schweitzer; Michael Craven; Valtino Afonso; Holly Cotner; Frank Callaghan; John Schultz
- Web page: https://patentgrep.com/patent/US7263397B2

## CPC

- A61B 5/06: Devices, other than using radiation, for detecting or locating foreign bodies {; Determining position of diagnostic devices within or on the body of the patient}
- 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 5/1076: {for measuring dimensions inside body cavities, e.g. using catheters (A61B3/1005 takes precedence)}
- A61B 5/287: Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]
- A61B 5/7207: {of noise induced by motion artifacts}
- A61N 1/3625: {External stimulators}
- A61N 1/3702: {Physiological parameters (A61N1/365 takes precedence; evoked response A61N1/371)}
- A61B 2034/2053: {Tracking an applied voltage gradient}
- A61B 2034/2072: {Reference field transducer attached to an instrument or patient}
- A61B 2562/046: in a matrix array
- 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

A medical system for finding and displaying the location of electrodes within the body. The electrodes may be used to measure the voltage on the heart wall and display this as an activation map on a geometry representing the heart chamber.

## Claims

### Claim 1

A method to collect and present cardiac medical information to a physician comprising:
applying a set of surface patch electrodes to said patient;
positioning an intracavitary electrode on a catheter placed in a heart of said patient;
injecting current between pairs of said set of surface patch electrodes, defining driven electrode axes;
measuring the voltage present on the intracavitary electrode due to the applied currents;
resolving the location of the intracavitary electrode along each of the axes based upon the measured voltage on the intracavitary electrode;
collecting multiple intracavitary electrode locations;
selecting the exterior most locations and creating a shell based upon the exterior most locations generating a surface geometry; and
presenting the surface geometry as an image to the physician.

### Claim 2 (depends on 1)

The method of claim 1 further comprising the steps of:
measuring voltage on the intracavitary electrode generated by the heart creating EP data;
projecting the EP data on the surface geometry; and
displaying the location of said intra-cardiac electrode on said image.

### Claim 3 (depends on 2)

The method of claim 2 wherein:
said EP data includes the peak to peak value of the voltage measurement.

### Claim 4 (depends on 3)

The method of claim 3 wherein:
said EP data includes a time value related to relative timing of the voltage measurement and a pre-selected fiducial time.