Abstract: An implantable microstimulator configured to be implanted beneath a patient's skin for tissue stimulation employs a bi-directional RF telemetry link for allowing data-containing signals to be sent to and from the implantable microstimulator from at least two external devices. Further, a separate electromagnetic inductive telemetry link allows data containing signals to be sent to the implantable microstimulator from at least one of the two external devices. The RF bidirectional telemetry link allows the microstimulator to inform the patient or clinician regarding the status of the microstimulator device, including the charge level of a power source, and stimulation parameter states. The microstimulator has a cylindrical hermetically sealed case having a length no greater than about 27 mm and a diameter no greater than about 3.3 mm. A reference electrode is located on one end of the case and an active electrode is located on the other end of the case.

Abstract: A magnetostrictive microelectromechanical system (MEMS) element based magnetometer includes a MEMS element with any type of magnetostrictive material. The MEMS element can be made with or coated by the magnetostrictive material. The magnetometer can include a frequency measuring device, such as an oscilloscope, a frequency counter, a wave meter, a spectrum analyzer or the like. The magnetostrictive MEMS element can be used as a resonator in any type of oscillator circuit, such as a Pierce, a Colpitts, or a Clapp oscillator circuit. The magnetometer can be calibrated. The magnetostrictive MEMS element can be placed proximate a magnetic field, a resonant frequency of the magnetostrictive MEMS element proximate the magnetic field can be determined, and a property of the magnetic field can be determined based on a change in the resonant frequency of the magnetostrictive MEMS element proximate the magnetic field.

Abstract: An exemplary system for communicating with an implantable stimulator includes a coil configured to transmit a signal modulated with on-off keying (OOK) modulation to transmit control data. The system further includes a first telemetry receiver in the implantable stimulator configured to receive the control data in accordance with the OOK modulation. An exemplary method of communicating with an implantable stimulator includes modulating a signal with control data using OOK modulation and transmitting the signal to the implantable stimulator.

Abstract: An implantable microstimulator configured to be implanted beneath a patient's skin for tissue stimulation employs a bidirectional RF telemetry link for allowing data-containing signals to be sent to and from the implantable microstimulator from at least two external devices. Further, a separate electromagnetic inductive telemetry link allows data containing signals to be sent to the implantable microstimulator from at least one of the two external devices. The RF bidirectional telemetry link allows the microstimulator to inform the patient or clinician regarding the status of the microstimulator device, including the charge level of a power source, and stimulation parameter states. The microstimulator has a cylindrical hermetically sealed case having a length no greater than about 27 mm and a diameter no greater than about 3.3mm. A reference electrode is located on one end of the case and an active electrode is located on the other end of the case.