Portable functional electrical stimulation (FES) system for upper or lower extremity applications

• US 5,983,140 A
• Filed: 11/02/1998
• Issued: 11/09/1999
• Est. Priority Date: 06/06/1997
• Status: Expired due to Term

• Current Assignee: Shriners Hospitals For Children (Shriner's International Headquarters Incorporated)
• Original Assignee: Shriners Hospitals For Children (Shriner's International Headquarters Incorporated)
• Inventors: Betz, Randal R., Smith, Brian T., Douglas, John, McGee, Brian, Ignatoski, Michael
• Primary Examiner(s): Getzow, Scott M.
• Application Number:
  US09/184,780
• Time in Patent Office: 372 Days
• Field of Search: 607/48, 607/49, 607/59
• US Class Current: 607/59
• CPC Class Codes: A61N 1/36003 of motor muscles, e.g. for walking assistance

Abstract

A functional electrical stimulation system for generating a data file storing stimulation patterns that can be provided to a stimulator is described. The system includes a host computer system for producing a data structure or data file that describes the patterns and a portable stimulator that using the data structure or data file applies electrical pulses to electrodes carried by a patient. The host computer system and the stimulator system each have a memory storing a table having control and pattern generation information with indexes into a table that separately stores electrode characterization data for each electrode used by the portable stimulator.

Claims

1. A method of generating stimulation patterns for execution by a functional electrical stimulator system comprises the steps of:

characterizing electrode responses for electrodes used by the functional electrical stimulator;

forming a plurality of primitive movement patterns by electrically stimulating selected electrodes carried by a subject patient;

combining from the plurality of primitive movements selected primitive movements to produce interval patterns; and

forming a plurality of primitive movement patterns by electrically stimulating selected electrodes carried by a subject patient;

combining from the plurality of primitive movements selected primitive movements to produce interval patterns; and

combining at least two of said interval patterns to form a complex movement.

2. The method as recited in claim 1 wherein the combining primitive movements further comprises defining a type of control for the primitive movement to regulate the desired interval pattern movement.

3. The method as recited in claim 2 wherein the defining control type comprises selecting from a time based control or a proportional control type.

4. The method as recited in claim 3 further comprising determining the duration of the interval in time or percentage of proportional signal applied to the movement.

5. The method as recited in claim 4 wherein combining intervals further comprises integrating branching conditions of the interval movements to produce the complex movement.

6. The method as recited in claim 2 wherein combining primitive movements further comprises determining break points or branching conditions to alter, stop or hold stimulated movements.

7. The method as recited in claim 1 further comprising storing the data file including the complex movement into a portable functional electrical stimulator unit.

8. The method of claim 1 wherein combining interval patterns combines a plurality of interval patterns to produce stage patterns and wherein the stage patterns are combined to produce the complex movement.

9. The method as recited in claim 8 wherein combining intervals further comprises integrating branching conditions of the interval movements to produce the complex movement.

10. A portable stimulator for applying electrical pulses to electrodes carried by a patient, comprises:

a processor executing a program that provides electrical signals for the electrodes;

a memory storing said program;

a memory storing a stimulation pattern file, said stimulation pattern file comprising;

a data structure storing;

control and pattern generation information; and

electrode characterization data for each electrode used by the portable stimulator;

a circuit responsive to signals from the processor to generate electrical stimulation pulses.

11. The system of claim 10 wherein said stimulation pattern file comprises, a first set of tables storing control and pattern generation information:

a pattern table containing a listing of a plurality of stimulation patterns, said pattern table including a field identifying the pattern and a field containing a index of branching conditions;

a table of branching conditions indexed by the index of the pattern table, said table of branching conditions including a field containing a Tic index;

a Tic table including a channel index for each channel and at least one index that identifies a table storing data corresponding to activation parameters of each channel of the stimulator; and

a table indexed by the at least one index of the Tic table storing the characterization data for the electrodes.

12. The system of claim 11 wherein said table of branching conditions further includes an event field storing an index to an event routine and a control field storing a value which determines whether control is time based or proportional based.

13. The system of claim 11 wherein said Tic table further includes a field storing a value corresponding to a pulse duration for each stimulation channel.

14. The system of claim 10 wherein the program comprises instructions for causing the processor to:

access a pattern in the pattern table;

retrieve a branching condition;

set characterization data for the electrodes for the particular retrieved pattern.