Feedback control system for walking

• US 4,569,352 A
• Filed: 11/15/1984
• Issued: 02/11/1986
• Est. Priority Date: 05/13/1983
• Status: Expired due to Term

• Current Assignee: Wright State University
• Original Assignee: Wright State University
• Inventors: Petrofsky, Jerrold S., Phillips, Chandler A., Heaton, Harry H. III
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Shein, Mitchell J.
• Application Number:
  US06/671,805
• Time in Patent Office: 453 Days
• Field of Search: 128/1 R, 128/421-423, 128/80 G, 3/1, 3/1.1, 3/1.2
• US Class Current: 607/49
• CPC Class Codes: A61H 2230/62 Posture
• CPC Class Codes: A61H 3/008 using suspension devices for supporting the body in an upright walking or standing position, e.g. harnesses
• CPC Class Codes: A61N 1/36003 of motor muscles, e.g. for walking assistance

Abstract

A computer algorithm and hardware are disclosed for feedback control of movement in man for standing and walking. The system measures motion of the hips, knees and ankles and generates control signals for ten different muscle groups. Hip and knee supports are provided for restricting hip and knee movement to a common plane.

Claims

1. A feedback control system for walking comprising:

means for restricting the hips and knees to common plane movement,

first stimulation means for stimulating the iliacus and hamstring muscle groups to produce hip movement in said common plane,

first sensing means for sensing hip movement and generating a first feedback signal in correspondence therewith,

second stimulating means for stimulating the quadriceps muscle groups to produce knee movement in said common plane in coordination with said hip movement,

second sensing means for sensing said knee movement and generating a second feedback signal in correspondence therewith,

means for supporting the ankles,

third stimulation means for stimulating the gastrocnemius and tibialis muscle groups to produce ankle movement which is coordinated with said hip and knee movement,

third sensing means for sensing said ankle movement and generating a third feedback signal in correspondence therewith, and

programmed microprocessor means for receiving said first, second and third feedback signals and generating control signals for said first, second and third stimulating means.

2. A feedback control system according to claim 1 and further comprising fourth sensing means for sensing shoulder movement and generating a fourth feedback signal in correspondence therewith;

said microprocessor being connected for reception of said fourth feedback signal and programmed for timing the generation of said control signals in response to said fourth feedback signal.

3. A feedback control system according to claim 2 and further comprising foot sensors for sensing contact of the heels and toes with the floor and signaling said contact to said microprocessor.

4. Apparatus for stimulation of human walking comprising:

stimulation means for electrically stimulating muscles in both legs of said human to produce coordinated movement of said legs,

means for restricting the hips and knees of said human to common plane movement,

support means for the ankles of said human

leg sensing means for sensing the positions of said legs and generating leg position signals corresponding thereto,

sensing means for sensing a voluntary movement of said human and generating sequence initiation signals corresponding thereto, and

computing means responsive to said leg position signals and said sequence initiation signals for controlling said stimulation means.

5. Apparatus according to claim 4 wherein said means for sensing voluntary movement comprises means for sensing movement of the shoulders of said human.

6. A feedback control system for walking comprising:

means for restricting the hips and knees to common plane movement,

means for supporting the ankles during said hip and knee movement

first stimulation means for stimulating hip movement in said common plane,

first sensing means for sensing hip movement and generating a first feedback signal in correspondence therewith,

second stimulating means for stimulating knee movement in said common plane in coordination with said hip movement,

second sensing means for sensing said knee movement and generating a second feedback signal in correspondence therewith,

third stimulation means for stimulating ankle movement which is coordinated with said hip and knee movement,

third sensing means for sensing said ankle movement and generating a third feedback signal in correspondence therewith, and

programmed microprocessor means for receiving said first, second and third feedback signals and generating control signals for said first, second and third stimulating means.

7. A feedback control system according to claim 6 and further comprising fourth sensing means for sensing shoulder movement and generating a fourth feedback signal in correspondence therewith;

said microprocessor being connected for reception of said fourth feedback signal and programmed for timing the generation of said control signals in response to said fourth feedback signal.

8. A feedback control system according to claim 7 and further comprising foot sensors for sensing contact of the heels and toes with the floor and signaling said contact to said microprocessor.

9. Apparatus for stimulated walking comprising:

stimulation means for electrically stimulating the muscles of both legs of a human being to produce coordinated walking movement,

sensing means for sensing the positions of said legs and generating feedback signals corresponding thereto,

computing means responsive to said feedback signals for controlling said stimulation means, and

overhead support means comprising;

a harness for attaching to the body of said human being,

a counterweight attached to said harness for counterbalancing the weight of said human being, and

an overhead support member for supporting said counterweight and a portion of the weight of said human being.