Calibration of implantable device orientation

A method, comprising:

• receiving acceleration information sensed from an implantable medical device (IMD);
• receiving reference acceleration information sensed from a reference device associated with a patient, the reference device separated from the IMD;
• determining a spatial relationship between an orientation of the IMD and a reference orientation of the reference device using the received acceleration information and the received reference acceleration information;
• acquiring subsequent acceleration information from the IMD;
• determining the orientation of the IMD or calibrating the subsequent acceleration information using the determined spatial relationship to correct for the orientation of the IMD;
• and
• generating a device diagnostic indicative of one or more of a rotation, a flip, or a migration of the IMD based at least in part on the determined orientation of the IMD.

A medical device, comprising:

• a memory circuit;
• and
• a calibration circuit configured to:
• receive acceleration information sensed from an implantable medical device (IMD);
• receive reference acceleration information sensed from a reference device associated with a patient, the reference device separated from the IMD;
• determine a spatial relationship between an orientation of the IMD and a reference orientation of the reference device using the received acceleration information and the received reference acceleration information;
• and
• generate a device diagnostic indicative of one or more of a rotation, a flip, or a migration of the IMD based at least in part on the determined orientation of the IMD,
• wherein the memory circuit is configured to store the determined spatial relationship;
• wherein the calibration circuit is configured to receive subsequent acceleration information from the IMD, and to determine the orientation of the IMD or to calibrate the subsequent acceleration information using the stored determined spatial relationship to correct for the orientation of the IMD.