US 11,596,342 B2 · Automatic detection of body planes of rotation

Abstract

Techniques are disclosed for automatically calibrating a reference orientation of an implantable medical device (IMD) within a patient. In one example, sensors of an IMD sense a plurality of orientation vectors of the IMD with respect to a gravitational field. Processing circuitry of the IMD processes the plurality of orientation vectors to identify an upright vector that corresponds to an upright posture of the patient. The processing circuitry classifies the plurality of orientation vectors with respect to the upright vector to define a sagittal plane of the patient and a transverse plane of the patient. The processing circuitry determines, based on the upright vector, the sagittal plane, and the transverse plane, a reference orientation of the IMD within the patient. As the orientation of the IMD within the patient changes over time, the processing circuitry may recalibrate its reference orientation and accurately detect a posture of the patient.

Claims23

Dependent claims

A method comprising:

sensing, by one or more sensors of an implantable medical device (IMD), a plurality of orientation vectors of the IMD with respect to a gravitational field;
clustering, by processing circuitry of the IMD, the plurality of orientation vectors into a first subset of orientation vectors;
defining, by the processing circuitry and based on the first subset of orientation vectors, an upright vector, the upright vector corresponding to an upright posture of a patient;
clustering, by the processing circuitry, the plurality of orientation vectors into a second subset of orientation vectors;
defining, by the processing circuitry and based on the second subset of orientation vectors and the upright vector, a transverse plane of the patient;
clustering, by the processing circuitry, the plurality of orientation vectors into a third subset of orientation vectors;
defining, by the processing circuitry and based on the third subset of orientation vectors and the upright vector, a sagittal plane of the patient;
and
determining, by the processing circuitry and based on the upright vector, the transverse plane, and the sagittal plane, a reference orientation of the IMD.

6 more elements

An implantable medical device (IMD) comprising:

one or more sensors configured to sense a plurality of orientation vectors of the IMD with respect to a gravitational field;
and
processing circuitry configured to:
cluster the plurality of orientation vectors into a first subset of orientation vectors;
define, based on the first subset of orientation vectors, an upright vector, the upright vector corresponding to an upright posture of a patient;
cluster the plurality of orientation vectors into a second subset of orientation vectors;
define, based on the second subset of orientation vectors and the upright vector, a transverse plane of the patient;
cluster the plurality of orientation vectors into a third subset of orientation vectors;
define, based on the third subset of orientation vectors and the upright vector, a sagittal plane of the patient;
and
determine, based on the upright vector, the transverse plane, and the sagittal plane, a reference orientation of the IMD.

8 more elements

Dependencies are inferred from the claim text.

Automatic detection of body planes of rotation

Life of this patent

Automatic detection of body planes of rotation

Life of this patent

Abstract

Claims23