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An implantable device system for delivering electrical stimulation pulses to a patient's body includes a pulse delivery device having a piezoelectric element that is enclosed by a housing and produces voltage signals delivered to the patient's body in response to receiving ultrasound energy. The pul

An implantable device system for delivering electrical stimulation pulses to a patient's body includes a pulse delivery device having a piezoelectric element that is enclosed by a housing and produces voltage signals delivered to the patient's body in response to receiving ultrasound energy. The pulse delivery device includes a circuit having a rate limiter configured to filter voltage signals produced by the piezoelectric element a rate faster than a maximum stimulation rate.

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1. An implantable device for delivering electrical stimulation pulses to a patient's body, comprising: a housing;a pair of electrodes carried by the housing;a piezoelectric element that is enclosed by the housing and produces voltage signals in response to receiving ultrasound energy transmitted thr

1. An implantable device for delivering electrical stimulation pulses to a patient's body, comprising: a housing;a pair of electrodes carried by the housing;a piezoelectric element that is enclosed by the housing and produces voltage signals in response to receiving ultrasound energy transmitted through the patient's body; anda circuit coupled to the piezoelectric element and configured to pass at least a portion of the voltage signals produced by the piezoelectric element to the pair of electrodes for delivering an electrical stimulation pulse to the patient's body, the circuit comprising a rate limiter configured to filter a voltage signal produced by the piezoelectric element that occurs at an interval less than a maximum pulse rate interval after a preceding voltage signal has been passed to the pair of electrodes. 2. The device of claim 1, wherein the circuit comprises a shunt configured to shunt a voltage signal produced by the piezoelectric element away from the electrode pair if the voltage signal produced by the piezoelectric element is longer than a maximum electrical stimulation pulse duration. 3. The device of claim 1, wherein the circuit comprises a low pass filter that filters a voltage signal produced by the piezoelectric element having a pulse duration that is less than a minimum electrical stimulation pulse duration. 4. The device of claim 1, wherein the circuit comprises a rectifier configured to receive the voltage signals produced by the piezoelectric element and pass the voltage signals to the rate limiter as rectified voltage signals. 5. The device of claim 1, wherein the circuit comprises a voltage limiter that limits a maximum voltage of the voltage signals passed to the pair of electrodes. 6. The device of claim 1, wherein the circuit comprises a high pass filter coupled to the rate limiter and configured to pass a voltage signal received from the rate limiter having a pulse duration up to a maximum pulse duration to the pair of electrodes. 7. The device of claim 1, further comprising a plurality of piezoelectric elements coupled to the circuit. 8. The device of claim 1, further comprising a plurality of piezoelectric elements and a plurality of circuits, each piezoelectric element coupled to a respective one of the plurality of circuits, each of the plurality of respective circuits comprising a respective rate limiter that is coupled to the pair of electrodes. 9. The device of claim 1, wherein the circuit further comprises: a first filter configured to filter first voltage signals produced by the piezoelectric element in response to receiving diagnostic ultrasound bursts having a pulse duration less than a minimum electrical stimulation pulse duration;a second filter configured to filter second voltage signals produced by the piezoelectric element in response to receiving diagnostic ultrasound bursts having a pulse duration greater than a maximum electrical stimulation pulse duration, andthe rate limiter comprising a shunt configured to shunt current in the circuit away from the pair of electrodes in response to third voltage signals produced by the piezoelectric element receiving diagnostic ultrasound signals at a rate that is greater than the maximum pulse rate interval. 10. The device of claim 1, wherein the device is a cardiac pacing pulse delivery device and the maximum pulse rate interval is a maximum cardiac pacing rate interval. 11. The device of claim 1, wherein the rate limiter comprises: a peak detector configured to detect voltage signal peaks greater than a voltage threshold; anda shunt configured to shunt pulses detected by the peak detector and occurring at a rate faster than a maximum pulse rate away from the pair of electrodes. 12. An implantable medical device system for delivering electrical stimulation pulses to a patient's body, comprising: an implantable pulse delivery device; anda second implantable device comprising an array of ultrasound transducers, a control circuit, and a first housing enclosing the array of ultrasound transducers and the control circuit, the control circuit configured to control the array to transmit ultrasound signals at a pulse delivery rate to the implantable pulse delivery device;the implantable pulse delivery device comprising: a second housing;a pair of electrodes carried by the second housing;a piezoelectric element that is enclosed by the housing and produces voltage signals in response to receiving ultrasound energy transmitted through the patient's body; anda circuit coupled to the piezoelectric element and configured to pass at least a portion of the voltage signals produced by the piezoelectric element to the pair of electrodes for delivering an electrical stimulation pulse to the patient's body, the circuit comprising a rate limiter configured to filter a voltage signal produced by the piezoelectric element that occurs at an interval less than a maximum pulse rate interval after a preceding voltage signal has been passed to the pair of electrodes. 13. The system of claim 12, wherein the circuit comprises a shunt configured to shunt a voltage signal produced by the piezoelectric element away from the electrode pair if the voltage signal produced by the piezoelectric element is longer than a maximum electrical stimulation pulse duration. 14. The system of claim 12, wherein the circuit comprises a low pass filter that filters a voltage signal produced by the piezoelectric element having a pulse duration that is less than a minimum electrical stimulation pulse duration. 15. The system of claim 12, wherein the circuit comprises a rectifier configured to receive the voltage signals produced by the piezoelectric element and pass the voltage signals to the rate limiter as rectified voltage signals. 16. The system of claim 12, wherein the circuit comprises a voltage limiter that limits a maximum voltage of the voltage signals passed to the pair of electrodes. 17. The system of claim 12, wherein the circuit comprises a high pass filter coupled to the rate limiter and configured to pass a voltage signal received from the rate limiter having a pulse duration up to a maximum pulse duration to the pair of electrodes. 18. The system of claim 12, further comprising a plurality of piezoelectric elements coupled to the circuit. 19. The system of claim 12, further comprising a plurality of piezoelectric elements and a plurality of circuits, each piezoelectric element coupled to a respective one of the plurality of circuits, each of the plurality of respective circuits comprising a respective rate limiter that is coupled to the pair of electrodes. 20. The system of claim 12, wherein the circuit further comprises: a first filter configured to filter first voltage signals produced by the piezoelectric element in response to receiving diagnostic ultrasound bursts having a pulse duration less than a minimum electrical stimulation pulse duration; anda second filter configured to filter second voltage signals produced by the piezoelectric element in response to receiving diagnostic ultrasound bursts having a pulse duration greater than a maximum electrical stimulation pulse duration, andthe rate limiter comprising a shunt configured to shunt current in the circuit away from the pair of electrodes in response to third voltage signals produced by the piezoelectric element receiving diagnostic ultrasound signals at a rate that is greater than the maximum pulse rate interval. 21. The system of claim 12, wherein the first implantable device is a cardiac pacing pulse delivery device and the maximum pulse rate interval is a maximum cardiac pacing rate interval. 22. The system of claim 12, wherein the rate limiter comprises: a peak detector configured to detect voltage signal peaks greater than a voltage threshold; anda shunt configured to shunt pulses detected by the peak detector and occurring at a rate faster than a maximum pulse rate away from the pair of electrodes. 23. An implantable medical device system for delivering electrical stimulation pulses to a patient's body, comprising: a first implantable device; anda second implantable device comprising an array of ultrasound transducers, a control circuit, and a first housing enclosing the array of ultrasound transducers and the control circuit, the control circuit configured to control the array to transmit ultrasound signals at an electrical stimulation pulse delivery rate to the first device;the first implantable device comprising: a second housing;a pair of electrodes carried by the second housing;a piezoelectric element enclosed by the housing and configured to produce a voltage signal in response to receiving ultrasound energy transmitted through a patient's body, the piezoelectric element, wherein the ultrasound energy comprises first ultrasound signals transmitted by the second implantable device and second, diagnostic ultrasound signals transmitted through the patient's body; anda circuit coupled to the piezoelectric element and configured to: deliver electrical stimulation pulses to the patient's body by passing a first portion of the voltage signals produced by the piezoelectric element in response to the first ultrasound signals transmitted by the second implantable device to the pair of electrodes, andfilter a second portion of the voltage signals from being passed to the pair of electrodes, the second portion of the voltage signals produced by the piezoelectric element in response to the second, diagnostic ultrasound signals.