A medical device system for delivering a neuromodulation therapy includes a delivery tool for deploying an implantable medical device at a neuromodulation therapy site. The implantable medical device includes a housing, an electronic circuit within the housing, and an electrical lead comprising a lead body extending between a proximal end coupled to the housing and a distal end extending away from the housing and at least one electrode carried by the lead body. The delivery tool includes a first cavity for receiving the housing and a second cavity for receiving the lead. The first cavity and the second cavity are in direct communication for receiving and deploying the housing and the lead coupled to the housing concomitantly as a single unit.

A signal processor is described for communication with an implanted medical device. An external processor transmits to the implanted medical device an implant data signal having a sequence of HI and LOW logic states at a fixed data bit rate. The pulse width durations of the HI and LOW logic states is adjustable in response to feedback telemetry data from the implantable medical device.

An ECT system capable of focusing the electrical signals on a specific portion of the patient's brain is provided. The ECT system includes a means of applying unidirectional electrical signals and asymmetric electrodes for focusing the signals on the patient. A method of titrating an electro-convulsive therapy (ECT) system and a method of operating an ECT system are also provided. The method includes setting an initial current value, administering an ECT signal to the patient, determining if the seizure threshold has been achieved, and repeating as necessary until the seizure threshold is achieved.

A charger including a class E power driver, a frequency-shift keying (“FSK”) module, and a processor. The processor can receive data relating to the operation of the class E power driver and can control the class E power driver based on the received data relating to the operation of the class E power driver. The processor can additionally control the FSK module to modulate the natural frequency of the class E power transformer to thereby allow the simultaneous recharging of an implantable device and the transmission of data to the implantable device. The processor can additionally compensate for propagation delays by adjusting switching times.

An RF telemetry receiver circuit for active implantable medical devices. The baseband binary signal (D.sub.b) is doubly modulated by a low frequency carrier (F.sub.m) and by a high frequency carrier (F.sub.c). The receiver circuit is a semi-passive non heterodyne circuit, devoid of a local oscillator and mixer. It comprises an antenna (104), a passive bandpass filter (108) centered on the high-frequency carrier (F.sub.c), a passive envelope detector (120-126) and a digital demodulator (116). The envelope detector comprises a first diode circuit (120) of non-coherent detection, an active bandpass filter (122) centered on a frequency (2.F.sub.m) twice the low frequency carrier and having a bandwidth (2.D.sub.b) twice the baseband bandwidth, and a second diode circuit (124) of non-coherent detection, outputting a baseband signal applied to the digital demodulation stage (116).

Presented herein are techniques for electrically stimulating a recipient's vestibular nerve in order to mask vestibular noise signals (vestibular noise) generated by the peripheral vestibular system (e.g., prevent erroneous balance information generated by the peripheral vestibular system from being sent to the brain of the recipient). A vestibular nerve stimulator in accordance with embodiments presented herein includes a plurality of electrodes implanted in an inner ear of a recipient at a location that is adjacent to the otolith organs of the inner ear. The vestibular nerve stimulator is configured to generate one or more continuous pulse trains and to deliver the one or more continuous pulse trains to the inferior branch of the recipient's vestibular nerve.

Methods and systems can facilitate identifying effective electrodes and other stimulation parameters, as well as determining whether to use cathodic and anodic stimulation. Alternately, the methods and systems may identify effective electrodes and other stimulation parameters based on preferential stimulation of different types of neural elements. These methods and systems can further facilitate programming an electrical stimulation system for stimulating patient tissue.

Disclosed are systems and methods for use of an inductive link for a communication channel in a transcutaneous energy transfer system. An example system may include a resonant circuit associated with an external primary, a power transistor connected to the resonant circuit and configured to drive the resonant circuit with a first time-varying electrical signal having a frequency, and a power driver connected to the power transistor that is configured to set the frequency of the first time-varying electrical signal to a resonant frequency to enable power transfer from the external primary to an implanted secondary. The example system may further include a communication driver operatively connected to the power transistor and configured to encode the first time-varying electrical signal with a data signal by modulating an attribute of the time-varying electrical signal as electrical power is transferred from the external primary to the implanted secondary.

Devices, systems, and techniques are disclosed for managing electrical stimulation therapy and/or sensing of physiological signals such as brain signals. For example, a system is configured to receive, for each electrode combination of a plurality of electrode combinations, information representing a signal sensed in response to first electrical stimulation delivered to a patient via a lead, wherein the plurality of electrode combinations comprise different electrode combinations comprising electrode disposed at different positions around a perimeter of the lead implanted in the patient. The system may also be configured to determine, based on the information for each electrode combination of the plurality of electrode combinations, values for a threshold at different locations around the perimeter of the lead and determine, based on the values for the threshold, one or more stimulation parameter values that at least partially define second electrical stimulation deliverable to the patient via the lead.

In one aspect, wireless gastrointestinal stimulations are described herein. In some embodiments, a system described herein comprises at least one transmitter and at least one stimulation device. The transmitter can include a signal generator operable to generate an electromagnetic signal, a first antenna operable to broadcast the electromagnetic signal, and an energy source. The at least one stimulation device is operable to deliver a pattern of electrical pulses to a gastrointestinal tissue comprising a muscle, and the stimulation device includes a circuit board having a circumference, at least one second antenna wrapped around the circumference of the circuit board, the at least one second antenna being configured to receive the electromagnetic signal and to generate an electrical current from the electromagnetic signal, and at least one electrode operable to deliver the electrical current to the muscle.