Abstract: Techniques for retrieving information from an implantable medical device (IMD) having a depleted internal energy source such as a non-rechargeable battery are disclosed. The IMD is powered by and communicates with an external interrogation device to access a memory location of the IMD and for transfer of the information in the memory location to the external interrogation device subsequent to depletion of the internal energy source. In an embodiment, the memory location is included in a non-volatile memory component of the IMD to maintain the information stored in the memory component.

Abstract: Techniques for retrieving information from an implantable medical device (IMD) having a depleted internal energy source such as a non-rechargeable battery are disclosed. The IMD is powered by and communicates with an external interrogation device to access a memory location of the IMD and for transfer of the information in the memory location to the external interrogation device subsequent to depletion of the internal energy source. In an embodiment, the memory location is included in a non-volatile memory component of the IMD to maintain the information stored in the memory component.

Abstract: Various techniques for using an accelerometer to detect cardiac contractions are described. One example method described includes filtering a signal received by an electrical sensing channel of an implantable medical device (IMD) configured to detect electrical depolarizations of a heart of a patient, identifying a failure of the electrical sensing channel of the IMD based on the filtered signal and, in response to identifying the failure, initiating a mechanical sensing channel of the implantable medical device to identify mechanical cardiac contractions.