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.

The invention essentially consists of a system (1) for transmitting acoustic power, which will determine the optimum frequency and the optimum electrical load without data communication being established beforehand with the receiver (3).

The invention essentially consists of a system (1) for transmitting acoustic power, which will determine the optimum frequency and the optimum electrical load without data communication being established beforehand with the receiver (3).

Various implementations include apparatuses and methods for subcutaneous sensing. Certain implementations include an apparatus having: a biocompatible housing defining a longitudinal axis; a subcutaneous sensor; a circuit board; a controller; and an ultrasound transmitter disposed within the biocompatible housing and including a tubular piezoelectric transducer extending longitudinally along the longitudinal axis.

Various implementations include apparatuses and methods for subcutaneous sensing. Certain implementations include an apparatus having: a biocompatible housing defining a longitudinal axis; a subcutaneous sensor; a circuit board; a controller; and an ultrasound transmitter disposed within the biocompatible housing and including a tubular piezoelectric transducer extending longitudinally along the longitudinal axis.

The present technology is generally directed to medical implants, such as stimulation assemblies for stimulating heart tissue. In some embodiments, a stimulation assembly includes a body, circuitry positioned at least partially within the body, an electrode coupled to the body, and a hook mechanism coupled to the body. The stimulation assembly can be implanted at cardiac tissue of a patient such that the electrode electrically contacts the tissue. The circuitry can be configured to receive acoustic energy and convert the acoustic energy to electrical energy, and the electrode can deliver the electrical energy to the tissue to stimulate the tissue. The hook mechanism can be configured to engage the tissue to pull the tissue and the electrode toward and into engagement with one another.

A signal generator generates an electrical signal that is sent to an amplifier, which increases the power of the signal using power from a power source. The amplified signal is fed to a sender transducer to generate ultrasonic waves that can be focused and sent to a receiver. The receiver transducer converts the ultrasonic waves back into electrical energy and stores it in an energy storage device, such as a battery, or uses the electrical energy to power a device. In this way, a device can be remotely charged or powered without having to be tethered to an electrical outlet.

A signal generator generates an electrical signal that is sent to an amplifier, which increases the power of the signal using power from a power source. The amplified signal is fed to a sender transducer to generate ultrasonic waves that can be focused and sent to a receiver. The receiver transducer converts the ultrasonic waves back into electrical energy and stores it in an energy storage device, such as a battery, or uses the electrical energy to power a device. In this way, a device can be remotely charged or powered without having to be tethered to an electrical outlet.

A system for providing energy to a bio-implantable medical device includes an acoustic energy delivery device and a bio-implantable electroacoustical energy converter. The acoustic energy delivery device generates acoustic energy with a multi-dimensional array of transmitting electroacoustical transducers. The acoustic energy is received by one or more receiving electroacoustical transducers in the bio-implantable electroacoustical energy converter. The receiving electroacoustical transducers convert the acoustic energy to electrical energy to power the bio-implantable medical device directly or indirectly. An external alignment system provides lateral and/or angular positioning of an ultrasound energy transmitter over an ultrasound energy receiver. The acoustic energy transmitter alignment system comprises either or both x-y-z plus angular positioning components, and/or a substantially multi-dimensional array of transmitters plus position sensors in both the transmitter and receiver units.

A wireless power supply device includes: a power supply coil for wirelessly transmitting electric power to a power receiving device; a driving circuit for outputting pulse electric power to the power supply coil; a first radio module for receiving rectified voltage information regarding rectified voltage generated in the power receiving device via a radio communication path; and a control circuit for generating a driving control signal on the basis of the rectified voltage information received by the first radio module, thereby to control the driving circuit, said control circuit controlling a driving frequency of the driving circuit at a fixed frequency between a series resonant frequency and a parallel resonant frequency of a resonant circuit of the power receiving device.