# US 8,788,039 B1 · Implantable cardiac stimulation device providing bichamber and multichamber pacing timing and method

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- Number: US 8,788,039 B1
- Document ID: US8788039B1
- Status: Granted
- Kind: B1
- Application number: 11/614,827
- Filed: 2006-12-21
- Granted: 2014-07-22
- Earliest claimed: 2006-12-21
- Assignees: Pacesetter, Inc.
- Applicants: Robert J. Graumann
- Inventors: Robert J. Graumann
- Web page: https://patentgrep.com/patent/US8788039B1

## CPC

- A61N 1/36843: {Bi-ventricular stimulation}
- A61N 1/36535: {controlled by body position or posture}
- A61N 1/36542: {controlled by body motion, e.g. acceleration}
- A61N 1/3684: {for stimulating the heart at multiple sites of the ventricle or the atrium}
- 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

An implantable cardiac stimulation device provides bichamber pacing. In accordance with a first embodiment, the device varies the interchamber pacing delay responsive to either sensed intrinsic activity or sensor measured activity of the patient. In another embodiment, the device times separate and independent AV intervals for providing pacing pulses to the right and left chambers.

## Claims

### Claim 1

An implantable cardiac stimulation device comprising:
an activity sensor that senses an activity level of a patient, wherein the activity level of the patient corresponds to an exercise state of the patient;
a pulse generator that provides a first pacing pulse to a first chamber of a heart and a second pacing pulse to a second chamber of the heart, the first and second chambers being corresponding chambers and the first and second pacing pulses being separated in time by an interchamber pacing delay; and
a timer that times the interchamber pacing delay, the interchamber pacing delay being related to the activity level of the patient sensed by the activity sensor, wherein the first and second chambers are a right ventricle and left ventricle respectively of the heart and wherein the interchamber pacing delay is an interventricular pacing delay, and wherein the timer automatically adjusts the interchamber pacing delay based on changes in the patient activity level.

### Claim 2 (depends on 1)

The device of claim 1 further comprising a timing control that determines a pacing rate responsive to the sensed patient activity, and wherein the timer is responsive to the pacing rate and the interchamber pacing delay is related to the pacing rate.

### Claim 3 (depends on 2)

The device of claim 2 wherein the pacing rate is an atrial pacing rate.

### Claim 4 (depends on 2)

The device of claim 2 wherein the timer begins timing the interventricular pacing delay responsive to delivery of the first pacing pulse.

### Claim 5 (depends on 2)

The device of claim 2 wherein the pulse generator delivers the first pacing pulse an AV interval after an atrial activation of the heart.

### Claim 6 (depends on 5)

The device of claim 5 wherein the atrial activation is a right atrial activation.

### Claim 7 (depends on 5)

The device of claim 5 wherein the atrial activation is a left atrial activation.

### Claim 8 (depends on 2)

The device of claim 2 wherein the interventricular pacing delay is decreased with increased pacing rate.

### Claim 9 (depends on 2)

The device of claim 2 wherein the interventricular pacing delay is increased with increased pacing rate.

### Claim 10

An implantable cardiac stimulation device comprising:
an activity sensor that senses an activity level of a patient, wherein the activity level of the patient corresponds to an exercise state of the patient;
a timing control that determines a pacing rate responsive to the sensed patient activity level;
a pulse generator that provides a first pacing pulse to a first chamber of a heart and a second pacing pulse to a second chamber of the heart, the first and second chambers being corresponding chambers and the first and second pacing pulses being separated in time by an interchamber pacing delay; and
a timer that times the interchamber pacing delay, the interchamber pacing delay being related to the pacing rate, wherein the corresponding chambers are ventricles of the heart and wherein the interchamber pacing delay is an interventricular pacing delay, and wherein the timer automatically adjusts the interchamber pacing delay based on changes in the patient activity level.