A lead (1) for an active implantable medical device (99) comprising: an elongated, biocompatible, electrically non-conductive body (3) having a centre section (4) between a first portion (7) and a body extension (11); a plurality of electrical connectors (6) at the first portion (7); a plurality of electrodes (8) at a second portion (9) of the elongated body (3), wherein the second portion (9) is between the centre section (4) and the body extension (11); and a plurality of electrically conductive filaments (5) inside the elongated body (3) to connect the electrical connectors (6) to corresponding electrodes (8), wherein each of the plurality of electrically conductive filaments (5) include corresponding filament extension sections (13) in the body extension (11).

This disclosure relates to an implantable electric circuit (300) for medical stimulation The circuit comprises a plurality of capacitors (301) and a network of resistors (302). Each of the plurality of capacitors (301) is configured to couple radio frequency energy from one of a plurality of electrically conductive filaments (5) of a lead to the network of resistors (302). Further, the network of resistors (302) is configured to connect the plurality of capacitors (301) together to dissipate the radio frequency energy between the plurality of electrically conductive filaments. The network of resistors dissipates the energy between the filaments, which reduces negative impacts for the patient when subjected to MRI imaging. Further, no ground is required and as a result, the circuit can be placed into a header of an implantable pulse generator or into the lead itself.

A system to predict heating in implants includes a memory configured to store an image of a patient. The image includes a medical implant of the patient. The system also includes a processor operatively coupled to the memory and configured to determine an implant trajectory of the medical implant. The processor is also configured to determine a tangential component of an electric field that is incident upon the medical implant at a plurality of locations along the implant trajectory. The processor is further configured to determine, based on the implant trajectory and the tangential component of the electric field at each of the plurality of locations, a specific absorption rate of radiofrequency (RF) energy associated with the medical implant.

In one example, a system includes telemetry circuitry configured for communication between a medical device and an external device associated with the medical device and processing circuitry. The processing circuitry is configured to determine an advertising interval for communication between the external device and the medical device based on sensor information from the external device. The processing circuitry is further configured to configure the medical device to advertise at the determined advertising interval.

An implantable medical device configured to be compatible with the environment inside an MRI machine. The implantable medical device includes a housing constructed of an electrically conductive material and pulse generation circuitry within the housing for generating electrical voltage pulses. The implantable medical device further includes a first conductor that is configured to transmit the electrical voltage pulses from the pulse generation circuitry to a patient's cardiac tissue and a second conductor that is configured to provide an electrically conductive path from the patient's cardiac tissue back to the pulse generation circuitry. The implantable medical device further includes a selectively interruptible electrically conductive path connecting the pulse generation circuitry with the housing.

The present disclosure provides a device for carrying out magnetic resonance imaging compatible optogenetics; and methods for using the device.

An example medical device system includes an implantable medical lead including a first defibrillation electrode and a second defibrillation electrode, the first and second defibrillation electrodes configured to deliver antitachyarrhythmia shocks, and a pace electrode disposed between the first defibrillation electrode and the second defibrillation electrode, the pace electrode configured to deliver a pacing pulse that generates an electric field proximate to the pace electrode. The medical device system includes a shield configured to be implanted in a patient separately from the implantable medical lead and disposed anterior at least one of the electrodes, wherein the shield is configured to impede an electric field of the electrical therapy in a direction from at least one of the first defibrillation electrode, the second defibrillation electrode, or the pace electrode away from a heart of the patient.

A system and method is provided for assessing Peripheral Nerve Stimulation (PNS). The system receives an imaging pulse sequence to be applied to a region of interest (ROI) of a subject arranged in the imaging system, where the imaging pulse sequence identifies coil parameters related to at least one coil. The system obtains a first model including a plurality of tissue types and corresponding electromagnetic properties in the ROI. The system then obtains a second model indicating location, orientation, and/or physiological properties of one or more nerve tracks in the ROI. The system estimates a plurality of PNS thresholds in the ROI caused by the imaging pulse sequence applied in the imaging system using the first model, the second model, a nerve membrane model, and the coil parameters.

A lead (1) for an active implantable medical device comprising: an elongated, biocompatible, electrically non-conductive body (3); a plurality of electrically conductive filaments (5) inside the elongated body (3) to electrically connect electrical connectors (6) to corresponding electrodes (8); and at least one elongated decoy conductor (10) inside the elongated body (3) to electromagnetically couple with the plurality of electrically conductive filaments (5), wherein the at least one decoy conductor (10) has a higher electrical resistance than the plurality of electrical conductive filaments (5) to dissipate energy from currents induced by radio frequencies.

A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance.