# US 12,004,853 B2 · Systems and methods for disambiguation of posture

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,004,853 B2
- Document ID: US12004853B2
- Status: Granted
- Kind: B2
- Application number: 16/041,923
- Filed: 2018-07-23
- Published: 2019-01-31
- Granted: 2024-06-11
- Earliest claimed: 2017-07-26
- Assignees: Cardiac Pacemakers, Inc.
- Applicants: Cardiac Pacemakers, Inc.
- Inventors: Jeffrey E. Stahmann; John D. Hatlestad
- Web page: https://patentgrep.com/patent/US12004853B2

## CPC

- A61B 5/1116: {Determining posture transitions}
- A61B 5/14503: {invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors (A61B5/1459, A61B5/1464, A61B5/1473, A61B5/1482, A61B5/14865 take precedence)}
- A61B 5/14546: {for measuring analytes not otherwise provided for, e.g. ions, cytochromes}
- A61B 5/1118: {Determining activity level}
- A61B 5/14532: {for measuring glucose, e.g. by tissue impedance measurement}
- A61B 2562/0219: Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
- A61N 1/056: {Transvascular endocardial electrode systems}
- A61N 1/365: controlled by a physiological parameter, e.g. heart potential {(evoked response A61N1/371)}
- A61N 1/368: comprising more than one electrode co-operating with different heart regions {(A61N1/3622, A61N1/3627 take precedence)}
- A61N 1/3702: {Physiological parameters (A61N1/365 takes precedence; evoked response A61N1/371)}
- 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

Embodiments include medical device systems, medical devices, including accelerometers and chemical sensors, and methods of using the same to determine the posture of a patient. In an embodiment, a medical device system herein includes an accelerometer configured to generate a signal reflecting a position of a patient, a chemical sensor configured to generate a signal reflecting physiological analyte data of the patient and a controller in electrical communication with the accelerometer and the chemical sensor. The controller can be configured to determine a posture of the patient using the position signal generated by the accelerometer and the signal generated by the chemical sensor. Other embodiments are also included herein.

## Claims

### Claim 1

A method of operating a medical device system comprising:
measuring position data using an accelerometer;
making a preliminary posture determination of a patient using the position data measured by the accelerometer;
when the preliminary posture determination does not indicate a recumbent posture, then:,
measuring chemical data using an optical chemical sensor; and
normalizing the chemical data by correcting the chemical data in a manner that is proportional to the position data indicated by the accelerometer; and
making a final posture determination of the patient using the position data measured by the accelerometer and the normalized chemical data measured by the optical chemical sensor;
wherein the accelerometer and the optical chemical sensor are disposed within a housing of an implantable medical device.

### Claim 2 (depends on 1)

The method of claim 1, further comprising activating the optical chemical sensor if the preliminary posture determination does not indicate the recumbent posture.