Automated calibration of posture state classification for a medical device

摘要

Techniques relate to operating a medical device by classifying a detected posture state of a patient. This classification may be performed by comparing the detected posture state to posture state definitions available within the system. Each definition may be described in terms of a parameter (e.g., vector) indicative of a direction in three-dimensional space. The posture state definitions may be calibrated by automatically estimating values for these parameters, thereby eliminating the need for the patient to assume each posture state during the calibration process to capture actual parameter values. According to another aspect, the estimated parameter values may be updated as the patient assumes various postures during a daily routine. For instance, estimated vectors initially used to calibrate the posture state definitions may be changed over time to more closely represent posture states the patient actually assumes, and to further adapt to changes in a patient's condition.

主权项

1. A medical device, comprising:
a sensor adapted to provide an indication of a posture state of the patient; a memory adapted to store posture state definitions for classifying the posture state of a patient; and a processor adapted to obtain a reference vector, to automatically estimate from the reference vector a parameter value for at least one of the posture state definitions, and to classify the posture state of the patient based on the posture state definitions and the indication of the posture state of the patient, wherein the reference vector has a relationship to the housing of the medical device that is determined prior to the time the medical device is disposed in reference to the patient.