Gradual Recruitment of Muscle/Neural Excitable Tissue Using High-Rate Electrical Stimulation Parameters

• US 20070239226A1
• Filed: 06/13/2007
• Published: 10/11/2007
• Est. Priority Date: 08/17/2001
• Status: Abandoned Application

• Current Assignee: Advanced Bionics LLC (Sonova Holding AG)
• Original Assignee: Advanced Bionics Corporation (Sonova Holding AG)
• Inventors: Overstreet, Edward
• Application Number:
  US11/762,687
• Publication Number:
  US 20070239226A1
• Time in Patent Office: Days
• US Class Current: 607/48
• CPC Class Codes: A61N 1/32 alternating or intermittent currents applying electric fields by inductive or capacitive coupling A61N1/40; microwave apparatus A61N5/02
• CPC Class Codes: A61N 1/36071 Pain

Abstract

A neurostimulator system (170) stimulates excitable muscle or neural tissue through multiple electrodes (E1, E2, . . . En) fast enough to induce stochastic neural firing, thereby acting to restore “spontaneous” neural activity. The type of stimulation provided by the neurostimulator involves the use of a high rate, e.g., greater than about 2000 Hz, pulsatile stimulation signal generated by a high rate pulse generator (172). The stream of pulses generated by the high rate pulse generator is amplitude modulated in an output driver circuit (176) with control information, provided by a modulation control element (178). Such amplitude-modulated pulsatile stimulation exploits the subtle electro physiological differences between cells comprising excitable tissue in order to desynchronize action potentials within the population of excitable tissue. Such desynchronization induces a wider distribution of population thresholds, as well as a wider electrical dynamic range, thereby better mimicking biological recruitment characteristics.

Claims

1. A neurostimulator for stimulating muscle or neural excitable tissue, the neurostimulator having multiple electrode contacts through which electrical stimulation may be applied to the muscle or neural tissue, the neurostimulator comprising:

means for generating a pulsatile stimulation waveform having a pulse rate sufficiently fast and a pulse width sufficiently narrow to induce stochastic neural firing within the muscle or nerve excitable tissue;

means for amplitude modulating the pulsatile stimulation waveform with control information representative of a mean neural firing rate for the muscle or nerve excitable tissue to achieve a desired function; and

means for applying the amplitude-modulated pulsatile stimulation waveform to selected ones of the multiple electrode contacts, whereby excitable tissue is stochastically stimulated;

wherein the neurostimulator comprises a functional electrical stimulator having the multiple electrical contacts adapted to contact the muscle and neural tissue of a limb, and wherein the functional electrical stimulator includes means for defining desired limb movement, and wherein said desired limb movement is used to amplitude modulate the pulsatile stimulation waveform, which amplitude-modulated pulsatile stimulation waveform is applied through the electrical contacts for the purpose of eliciting stochastic neural firing of the excitable muscle and neural tissue located in or near the limb to be moved.

2. The neurostimulator of claim 1 wherein the pulse rate of the pulsatile stimulation waveform varies from 2000 Hz to 5000 Hz.

3. The neurostimulator of claim 2 wherein the pulse widths of the pulsatile stimulation waveform vary from about 2 μ

S to 100 μ

S.

4. A neurostimulator for stimulating muscle or neural excitable tissue, the neurostimulator having multiple electrode contacts through which electrical stimulation may be applied to the muscle or neural tissue, the neurostimulator comprising:

means for generating a pulsatile stimulation waveform having a pulse rate sufficiently fast and a pulse width sufficiently narrow to induce stochastic neural firing within the muscle or nerve excitable tissue, wherein the pulse rate of the pulsatile stimulation waveform varies from 2000 Hz to 5000 Hz; and

wherein the pulse widths of the pulsatile stimulation waveform are less than 100 μ

S;

means for amplitude modulating the pulsatile stimulation waveform with control information representative of a mean neural firing rate for the muscle or nerve excitable tissue to achieve a desired function; and

means for applying the amplitude-modulated pulsatile stimulation waveform to selected ones of the multiple electrode contacts, whereby excitable tissue is stochastically stimulated;

wherein the neurostimulator comprises a functional electrical stimulator having the multiple electrical contacts adapted to contact the muscle and neural tissue of a limb, and wherein the functional electrical stimulator includes means for defining desired limb movement, and wherein said desired limb movement is used to amplitude modulate the pulsatile stimulation waveform, which amplitude-modulated pulsatile stimulation waveform is applied through the electrical contacts for the purpose of eliciting stochastic neural firing of the excitable muscle and neural tissue located in or near the limb to be moved.