Technical Development Lab (TDL) - Catalog

IST 12 Implant System

Functionally, it provides 12 stimulation channels and two myoelectric signal (MES) channels. It is designed to measure myoelectric activity from two separate muscles, electronically process the signal and transfer the results to an external controller. Based on the received information, the external controller generates a stimulation pattern, which is sent back to the implant to create the functional muscle activity.

Epimysial, Intramuscular, Cuff and MES Electrodes

Both electrodes have a tandem conductor close coiled lead wire from the connector, covered with a silicone tube (“closed helix”). The epimysial electrode terminates in a Pt-10 Ir disk mounted in a silicone backing reinforced with dacron. The intramuscular electrode has a stainless steel stimulating area wound around the distal end of the lead.

Universal Control Module

The ECU modules include:

1. the communications module
2. the implant control module
3. the system input/output module
4. the power/battery module

The NP-II-ECU operating system allows the downloading of user applications and parameters as well as real-time control from a host PC using software described below. The device is powered through an internal rechargeable battery, which can provide five hours of continuous operation, and an external battery pack that can provide an additional five hours of operating. The NP-II-ECU design incorporates multiple safety features, including two levels of battery charge warnings, coupling status warnings, and internal error messages. The NP-II-ECU is housed in a wearable enclosure which includes input switches and output LEDs that can be configured to maximize function for each specific application. The external controller measures approximately 16 x 9 x 5 cm.

Cuff Electrode

This automatic spiraling electrode is designed to form to the natural shape of the nerve. The cuff electrode has four contracts that can be grouped together to create a stimulation that will activate groups of muscles.

MES Electrode

The MES electrodes are bipolar epimysial electrodes surgically implanted on the fascia of the target muscle. They are made of two 4mm diameter Pt10Ir discs mounted on a medical grade Dacron reinforced silicone backing. The discs are positioned 10mm apart. The distal lead wires for the bipolar MES electrodes begin with a Y-junction and run together to the distal recording electrode pair, with an impedance of 2 Ohms/cm.