# US 2009/0270959 A1 · Lead condition assessment for an implantable medical device

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- Number: US 2009/0270959 A1
- Document ID: US20090270959A1
- Status: Published application
- Kind: A1
- Application number: 12/499,001
- Filed: 2009-07-07
- Published: 2009-10-29
- Earliest claimed: 2005-10-28
- Assignees: Cyberonics, Inc.
- Inventors: Randolph K. Armstrong
- Web page: https://patentgrep.com/patent/US20090270959A1

## CPC

- A61N 1/36142: {for improving safety}
- A61N 1/3718: {Monitoring of or protection against external electromagnetic fields or currents}
- A61N 1/3614: {based on impedance measurement}
- A61N 1/36521: {the parameter being derived from measurement of an electrical impedance}
- A61N 1/3706: {Pacemaker parameters (stimulation threshold A61N1/371)}
- 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 method, system, and apparatus for performing a lead condition assessment and/or a lead orientation determination associated with an implantable medical device (IMD). A first impedance is determined. The first impedance relates to the impedance relative to a first electrode and a portion of the IMD. A second impedance is determined. The second impedance relates to the impedance relative to a second electrode and the portion of the IMD. The first impedance is compared with the second impedance to determine an impedance difference. A determination is made whether the impedance difference is outside a predetermined tolerance range. Furthermore, artifact measured during impedance measurements or test pulses may be compared to assess lead orientation. An indication of a lead condition error is provided in response to determining that the impedance difference is outside the predetermined tolerance range.

## Claims

### Claim at position 1

1-13. (canceled)

### Claim 14

A method for determining a condition of a lead assembly associated with an implantable medical device (IMD), comprising:
providing a first test signal to a first electrode coupled to the IMD;
measuring a first signal artifact relating to a second electrode coupled to the IMD, the first signal artifact resulting from the first test signal being applied to the first electrode;
providing a second test signal to the second electrode;
measuring a second signal artifact relating to the first electrode, the second signal artifact resulting from the second test signal being applied to the second electrode;
comparing the first signal artifact to the second signal artifact to determine a signal artifact differential; and
determining a lead condition in response to the signal artifact differential.

### Claim at position 3

15-21. (canceled)