Communications in a medical device system with link quality assessment
Methods and devices for testing and configuring implantable medical device systems. A first medical device and a second medical device communicate with one another using test signals configured to provide data related to the quality of the communication signal to facilitate optimization of the communication approach. Some methods may be performed during surgery to implant one of the medical devices to ensure adequate communication availability.
1. A method of performing a diagnostic test in an implantable medical device system comprising:
generating a first conducted signal from a first medical device intended for receipt by a second medical device comprising an output pattern for a selected period;
receiving the conducted signal by the second medical device and calculating a first communication metric of the first conducted signal as received;
wherein the selected period exceeds an expected or detected length of a recurring biological cycle.
2. The method of claim 1 wherein the recurring biological cycle is a cardiac cycle.
3. The method of claim 1 wherein the recurring biological cycle is a respiration cycle.
4. The method of claim 1 wherein the first medical device comprises at least three electrodes configured to output a conducted signal and the first conducted signal is generated by a first combination of electrodes, the method further comprising generating a second conducted signal using a second combination of electrodes, receiving the second conducted signal and calculating a second communication metric for the second conducted signal.
5. The method of claim 4 further comprising comparing the first communication metric as calculated for the first conducted signal as received to the second communication metric as calculated for the second conducted signal.
6. A method comprising performing the method of claim 1 while a patient assumes a first posture, and repeating the method of claim 1 while the patient assumes a second posture.
7. The method of claim 1 wherein the first and second medical devices are each leadless cardiac pacemakers.
8. The method of claim 1 wherein the first medical device is a subcutaneous implantable defibrillator and the second medical device is a leadless cardiac pacemaker.
9. The method of claim 1 wherein the first medical device is a leadless cardiac pacemaker and the second medical device is a subcutaneous implantable defibrillator.
10. The method of claim 1 wherein the communication metric comprises one or more of amplitude, relative signal strength indicator, signal-to-noise ratio, slew, frame error, or bit error rate.