Systems and methods for disambiguation of posture

Patent metadata

Field	Value
Publication number	US-12004853-B2
Application number	US-201816041923-A
Country	US
Kind code	B2
Filing date	Jul 23, 2018
Priority date	Jul 26, 2017
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

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.

First claim

The invention claimed is:

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.

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

Assignees

• Cardiac Pacemakers Inc

Inventors

• Stahmann Jeffrey E
• Hatlestad John D

Classifications

• A61B2562/0219

  Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches · CPC title

• A61B5/14546

  for measuring analytes not otherwise provided for, e.g. ions, cytochromes · CPC title

• A61B5/1118

  Determining activity level · CPC title

• A61B5/14532

  for measuring glucose, e.g. by tissue impedance measurement · CPC title

• A61B5/14503

  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) · CPC title