Patent application number | Description | Published |
20100217368 | CONTROLLED DETACHMENT OF INTRA-LUMINAL MEDICAL DEVICE - An intra-luminal medical device includes a fixation mechanism to attach the medical device to tissue within a body lumen, and a detachment mechanism to permit selective detachment of the medical device from the tissue attachment site without the need for endoscopic or surgical intervention. An electromagnetic device may be provided to mechanically actuate the detachment mechanism. Alternatively, a fuse link may be electrically blown to detach the medical device. As a further alternative, a rapidly degradable bonding agent may be exposed to a degradation agent to detach the medical device from a bonding surface within the body lumen. The medical device may eliminate problems associated with uncertain and inconsistent detachment of intra-luminal medical devices. | 08-26-2010 |
20110190852 | IMPLANTABLE MEDICAL DEVICES AND SYSTEMS HAVING DUAL FREQUENCY INDUCTIVE TELEMETRY AND RECHARGE - Implantable devices and related systems utilize coils or coil portions of a coil for inductive telemetry at one frequency and recharge at another frequency. The coils or coil portions are included in one or more tank circuits that share at least one node between the coils or coil portions. The recharge application may be provided with variations for aspects including power management and rectification. The telemetry application may be provided with variations for aspects including receiver connectivity for the downlink and coil driving for the uplink. | 08-04-2011 |
20110190853 | IMPLANTABLE MEDICAL DEVICES AND SYSTEMS HAVING POWER MANAGEMENT FOR RECHARGE SESSIONS - Implantable devices and related systems utilize power management features in conjunction with a recharge circuit that includes a coil and capacitance. The reactance such as the capacitance and/or inductance may be variable such that in the event of an overcharge condition, the reactance may be varied to change the resonant frequency of the circuit of the coil from the recharge frequency to another frequency to reduce the power being received. Other power management features may additionally or alternatively be employed. For instance, the device may send an uplink telemetry signal to an external device to request that recharge power be decreased. The device may switch additional resistance into the circuit of the coil to reduce the Q of the circuit. As another example, the device may clamp the circuit of the coil to ground. | 08-04-2011 |
20120066534 | POWER SOURCE COUPLING AND DECOUPLING IN MEDICAL DEVICE - Aspects of this disclosure relate to coupling and decoupling a power source of a device with circuitry within the device. For example, in aspects of this disclosure, when a short develops within the device, a switch circuit may decouple the power source from the some of the circuitry within the device. Decoupling the power source when a short develops may extent the operational time of the power source, and may reduce thermal excursion. | 03-15-2012 |
20120274270 | IMPLANTABLE MEDICAL DEVICES AND SYSTEMS HAVING INDUCTIVE TELEMETRY AND RECHARGE ON A SINGLE COIL - Implantable devices and related systems utilize a single coil for both inductive telemetry at one telemetry signal frequency and recharge at another recharge energy frequency. The coil is included in a tank circuit that may have a variable reactance. During telemetry, particularly outside of a recharge period, the reactance may be set so that the tank circuit is tuned to the telemetry frequency. During recharge, the reactance is set so that the tank circuit is tuned to the recharge frequency. Furthermore, the tank circuit may have a Q that is sufficiently small that the tank circuit receives telemetry frequency signals that can be decoded by a receiver while the tank is tuned to the recharge frequency so that telemetry for recharge status purposes may be done during the recharge period without changing the tuning of the tank circuit. | 11-01-2012 |
20130214731 | SELF-TUNING EXTERNAL DEVICE FOR WIRELESSLY RECHARGING IMPLANTABLE MEDICAL DEVICES - External device circuitry self-tunes so that current is being driven through a coil at a resonant frequency of the tank circuit including the coil. The self-tuning nature of the driver circuitry enables adaptation within a cycle to changes in the resonant frequency such as those due to changing loads on the coil from environmental factors. The self-tuning circuitry monitors the direction of current flow in the tank circuit so that during a non-driven phase of a two-phase cycle, the circuitry detects the current naturally changing directions and then activates the driver circuitry to drive current into the tank circuit in phase with the natural direction of current flow. Unity power factor is approximated while driving the coil despite changes in resonance. Power being driven into the tank circuit may then be measured at the approximation of unity power factor to control the amount of power being applied. | 08-22-2013 |
20140163644 | MINIMALLY INVASIVE IMPLANTABLE NEUROSTIMULATION SYSTEM - An external medical device generates a drive signal inductively coupled to an implantable coil from an external coil. A regulator module coupled to the implantable coil generates an output signal in response to the inductively coupled signal and a feedback signal correlated to an amplitude of the inductively coupled signal. A signal generator receives the output signal for generating a therapeutic electrical stimulation signal. The control module adjusts the drive signal in response to the feedback signal to control the electrical stimulation signal. | 06-12-2014 |
20140163645 | MINIMALLY INVASIVE IMPLANTABLE NEUROSTIMULATION SYSTEM - Various embodiments of a minimally invasive implantable medical device (IMD) system are described. In one embodiment, the implantable medical device system includes an external device for transmitting a communication signal and an implantable device for receiving the communication signal by inductive coupling. The implantable device is configured to harvest power from the inductively coupled communication signal and power a signal generator from the harvested power to generate a therapeutic electrical stimulation signal. | 06-12-2014 |