Abstract: An external charger for an Implantable Medical Device (IMD) is disclosed having a primary charging coil and preferably two sense coils. The sense coils provide feedback in the form of various monitored sense coil parameters that allow the charger to take various actions to monitor and regulate charging of the IMD, including determining an alignment between the charger and the IMD, adjusting the frequency of the magnetic field produced by the primary charging coil, adjusting a power of the magnetic field, and reception of back telemetry from the IMD. The charger further includes functions to set the power of the magnetic field in accordance with a sense coil parameter. These functions are selectable by a user to set a power mode for the charger.

Abstract: An external charger for an Implantable Medical Device (IMD) is disclosed having a primary charging coil and preferably two sense coils. The sense coils comprise an outer and inner sense coil, which are preferably concentric with the primary charging coil. An amplitude is induced on the sense coils, and a parameter such as ratio of these amplitudes is assessed by the charger to adjust the power of the magnetic field generated by the primary charging coil, or determine an alignment between the charging coil and the IMD, or both.

Abstract: An external charger for an Implantable Medical Device (IMD) is disclosed having a primary charging coil and preferably two sense coils. The sense coils provide feedback in the form of various monitored sense coil parameters that allow the charger to take various actions to monitor and regulate charging of the IMD, including determining an alignment between the charger and the IMD, adjusting the frequency of the magnetic field produced by the primary charging coil, adjusting a power of the magnetic field, and reception of back telemetry from the IMD. The charger further includes functions to set the power of the magnetic field in accordance with a sense coil parameter. These functions are selectable by a user to set a power mode for the charger.

Abstract: An external charger for an Implantable Medical Device (IMD) is disclosed having a primary charging coil and preferably two sense coils. The sense coils provide feedback in the form of various monitored sense coil parameters that allow the charger to take various actions to monitor and regulate charging of the IMD, including determining an alignment between the charger and the IMD, adjusting the frequency of the magnetic field produced by the primary charging coil, adjusting a power of the magnetic field, and reception of back telemetry from the IMD. The charger further includes functions to set the power of the magnetic field in accordance with a sense coil parameter. These functions are selectable by a user to set a power mode for the charger.

Abstract: An external charger for an Implantable Medical Device (IMD) is disclosed having a primary charging coil and preferably two sense coils. The sense coils provide feedback in the form of various monitored sense coil parameters that allow the charger to take various actions to monitor and regulate charging of the IMD, including determining an alignment between the charger and the IMD, adjusting the frequency of the magnetic field produced by the primary charging coil, adjusting a power of the magnetic field, and reception of back telemetry from the IMD. The charger further includes functions to set the power of the magnetic field in accordance with a sense coil parameter. These functions are selectable by a user to set a power mode for the charger.

Abstract: A neural ablation system is disclosed, which is coupleable to two reference electrodes affixable to the skin of the patient which act as a return for current provided through a needle electrode that provides the ablation therapy. Because the reference electrodes are included in the ablation current path, they are at risk of heating if they are not well affixed. The system includes resistance monitoring circuitry for monitoring the resistance of the reference electrodes, including a measurement source which operates independently of and is isolated from the ablation source. The measurement source applies a voltage across a series connection of two capacitors. The center node between the capacitors is connected to a common reference of the ablation source. The measurement and ablation sources operate at different frequencies, such that the impedance of the capacitors are different (e.g., open or short circuited) at these frequencies, which provides the isolation.

Abstract: Two LC circuits (each with its own coil) are used in either or both of an external controller or an implanted medical device to extend the range at which the two devices can communicate. Only one of the LC circuits (i.e., one of the coils) is used when the device is transmitting, while both LC circuits (i.e., both coils) are used when the device is receiving. When receiving, the LC circuits are preferably connected in series. The series connection of the LC circuits does not affect the resonant frequency, and thus this resonant frequency is the same for both transmission and reception despite the different LC circuits used. Switching circuitry is controlled to disconnect one of the LC circuits when the device is transmitting, and to connect the LC circuits in series during reception.

Abstract: Two LC circuits (each with its own coil) are used in either or both of an external controller or an implanted medical device to extend the range at which the two devices can communicate. Only one of the LC circuits (i.e., one of the coils) is used when the device is transmitting, while both LC circuits (i.e., both coils) are used when the device is receiving. When receiving, the LC circuits are preferably connected in series. The series connection of the LC circuits does not affect the resonant frequency, and thus this resonant frequency is the same for both transmission and reception despite the different LC circuits used. Switching circuitry is controlled to disconnect one of the LC circuits when the device is transmitting, and to connect the LC circuits in series during reception.