Gait training system and methods

1. A gait training system comprising:

a base support frame;

a hip flexion actuation assembly movably coupled to the base support frame, the hip flexion assembly comprising:

a hip flexion actuator, and

a hip flexion linkage movably coupled to the hip flexion actuator for linear actuation;

a knee flexion actuation assembly movably coupled to the base support frame so as to move with respect to the base support frame independent of the hip flexion actuation assembly, the knee flexion actuation assembly comprising:

a knee flexion actuator, and

a knee flexion linkage movably coupled to the knee flexion actuator for linear actuation;

a gait deviation module configured to determine a difference between a model gait and an input gait received via the hip flexion linkage and the knee flexion linkage; and

a gait actuator controller communicably coupled to the gait deviation module, the hip flexion actuator, and the knee flexion actuator; the gait actuator controller configured to activate one or more of the hip flexion actuator and the knee flexion actuator in response to the difference between the model gait and the input gait to compensate for the difference between the model gait and the input gait by linear actuation of one or more of the hip flexion linkage and the knee flexion linkage.

2. The gait training system of claim 1 , wherein the hip flexion actuator includes a first rotary motor coupled to a first capstan drum and wherein the knee flexion actuator includes a second rotary motor coupled to a second capstan drum.

3. The gait training system of claim 1 , further comprising a first cable coupling the first capstan drum to the hip flexion linkage and a second cable coupling the second capstan drum to the knee flexion linkage.

4. The gait training system of claim 1 , wherein the knee flexion linkage is movably coupled to the knee flexion actuator via a first series elastic assembly, the first series elastic assembly including at least one first spring positioned between the knee flexion actuator and the knee flexion linkage and wherein the hip flexion linkage is movably coupled to the hip flexion actuator via a second series elastic assembly, the second series elastic assembly including at least one second spring positioned between the hip flexion actuator and the hip flexion linkage.

5. The gait training system of claim 4 , wherein the gait deviation module is configured to determine the difference based on a deflection of at least one of the at least one first spring and the at least one second spring.

6. The gait training system of claim 4 , wherein the first series elastic assembly includes a distal spring coupled to distal end of the knee flexion linkage and a proximal spring coupled to a proximal end of the knee flexion linkage, the distal spring and the proximal spring coupled to a cable wrapped about the second capstan drum.

7. The gait training system of claim 4 , wherein the first series elastic assembly includes a first spring and a second spring coupled to the knee flexion linkage, the first spring coupled to a pulley component by a first cable the second spring coupled to a second cable coupled to a leg brace.

8. The gait training system of claim 1 , wherein the difference includes a position value corresponding to a position and a velocity value corresponding to a velocity.

9. The gait training system of claim 1 , wherein the gait deviation module is configured to determine the difference by an impedance measurement value.

10. The gait training system of claim 1 , wherein the knee flexion actuation assembly is rotatably coupled to the base support frame and wherein the hip flexion actuation assembly is rotatably coupled to the base support frame independent of the knee flexion actuation assembly.

11. The gait training system of claim 1 , wherein the knee flexion actuation assembly is rotatably coupled to the base support frame via a turntable.

12. The gait training system of claim 1 , wherein the knee flexion actuation assembly includes an alignment bracket comprising a plurality of rollers, the knee flexion linkage extending between the plurality of rollers.

13. The gait training system of claim 1 , wherein the hip flexion actuation assembly is movably coupled to the base support frame for yaw rotation with respect to the base support frame and for pitch rotation with respect to the base support frame.

14. The gait training system of claim 1 , wherein the hip flexion linkage and the knee flexion linkage are coupled to a brace configured for attachment below the knee.

15. The gait training system of claim 1 , wherein the hip flexion linkage includes a brace coupling configured to rotate about a plurality of axes, the brace coupling coupling the hip flexion linkage to a knee brace.

16. The gait training system of claim 1 , wherein the base frame includes a walker.

17. The gait training system of claim 1 , wherein the base frame includes a treadmill.

18. A gait training method comprising:

receiving, at a gait training controller, model gait values corresponding to parameters of a model gait;

detecting, via at least one sensor communicably coupled to the gait training controller, parameters of an input gait received via a knee flexion linkage coupled to a knee flexion actuator and a hip flexion linkage coupled to a hip flexion actuator, the knee flexion linkage coupled to the knee flexion actuator via a first series elastic assembly including at least one first spring, the hip flexion linkage coupled to the hip flexion actuator via a second series elastic assembly including at least one second spring;

determining a difference between the model gait and the input gait; and

activating one or more of the knee flexion actuator and the hip flexion actuator so as to compensate for the difference between the model gait and the input gait.

19. The gait training method of claim 18 , wherein detecting comprises sensing a change in a position of the knee flexion linkage and the hip flexion linkage.

20. The gait training method of claim 19 , wherein determining a difference between the model gait and the input gait further comprises determining a force being applied to at least one of the at least one first spring and the at least one second spring.

21. The gait training method of claim 19 , wherein activating one or more of the knee flexion actuator and the hip flexion actuator comprises rotating a capstan drum.

22. A gait training system comprising:

a base support frame;

an upper flexion actuation assembly movably coupled to the base support frame, the upper flexion assembly comprising:

a first flexion actuator, and

a first flexion linkage movably coupled to the first flexion actuator for linear actuation;

a lower flexion actuation assembly movably coupled to the base support frame so as to move with respect to the base support frame independent of the upper flexion actuation assembly, the lower flexion actuation assembly comprising:

a second flexion actuator, and

a second flexion linkage movably coupled to the second flexion actuator for linear actuation;

a leg brace coupled to the first flexion linkage the second flexion linkage by one or more series elastic assemblies, the one or more series elastic assemblies including at least one spring component;

a gait deviation module configured to determine a difference between a model gait and an input gait received via the upper flexion linkage and the lower flexion linkage; and

a gait actuator controller communicably coupled to the gait deviation module, the upper flexion actuator, and the lower flexion actuator; the gait actuator controller configured to activate one or more of the first flexion actuator and the second flexion actuator in response to the difference between the model gait and the input gait to compensate for the difference between the model gait and the input gait by linear actuation of one or more of the first flexion linkage and the second flexion linkage via the leg brace.