Ankle foot orthotic
View Patent ↗An ankle-foot orthotic is provide for assisting persons having lower extremity weakness including weak dorsiflexor and plantar flexor muscle groups. A combination of flexible and stiff polypropylene and polyethylene materials are used to assist in the transfer of energy along the components of the ankle-foot orthotic to mimic normal gait.
1. An orthotic device for application to the leg, heel, ankle and foot of a patient having lower extremely muscle weakness the device comprising:
a cuff for securing the device about the calf of the patient,
a heel cup having first and second sides for supporting the heel of the patient therein,
a vertical strut extending between said cuff and said heel cup to connect said cuff to said heel cup,
a foot plate integral with said heel cup and extending from said heel cup along the longitudinal axis of the foot to support the foot of the patient,
said vertical strut comprising:
a first side margin and a second side margin opposed to said first side margin.,
a first strut posterior layer comprised of polypropylene and connecting said first and second opposed side margins, said side margins extending downwardly from said cuff, said first opposed side margin continuing downwardly to pass on said first side of said heel cup and said second opposed side margin continuing downwardly to pass on said second side of said heel cup,
a second strut anterior layer comprised of polyethylene and connected to said first and second side margins, said second strut anterior layer extending from said cuff to said heel cup, said first and second strut layers forming a housing having an interior center,
a third strut layer located in said interior center between said first and second layers and comprised of polyethylene, said third layer extending downwardly along said interior center from said cuff to provide a flexible interior to said vertical strut, and
said foot plate comprising:
a generally flat surface and having a transverse line of flexion defining posterior and anterior foot plate sections, said footplate having a first relaxed, unflexed position where said posterior and anterior sections are in the same plane and said foot plate having a second flexed position where said anterior section is flexed upwardly along said line of flexion into a second flexed position to generate a tension force in response to the lifting of the heel said generated tension force being released upon said anterior section returning to said first position upon the completion of flexing of the toes at the metatarsals and said tension force propelling said heel cup upwardly said upward movement being communicated from said heel cup to said strut to push the leg and knee upwardly from the ground to allow the patient's foot to rotateably swing forward from the patient's knee.
2. The orthotic device of claim 1 , further comprising
an attachment strap disposed at said cuff.
3. The orthotic device of claim 1 , further comprising
an energy pathway extending along said vertical strut for transferring kinetic energy.
4. The orthotic device of claim 3 , wherein
said energy pathway branches at said heel cup along said first and second side margins.
5. The orthotic device of claim 4 , wherein
said third strut layer communicates with said energy pathway.
6. The orthotic device of claim 5 , wherein
said third strut layer terminates at said branch of said energy pathway.
7. The orthotic device of claim 4 , wherein
said energy pathway terminates in said foot plate.
8. The orthotic device of claim 1 , wherein
said first strut layer has a curvature for conforming to the calf.
9. The orthotic device of claim 1 , wherein
said second strut layer has a curvature for conforming to the calf.
10. An orthotic device comprising:
a cuff for securing the device about a calf of a patient;
a heel cup having first and second sides for supporting the heel of the patient therein;
a vertical strut extending between said cuff and said heel cup to connect said cuff to said heel cup;
a foot plate integral with said heel cup and extending from said heel cup along the longitudinal axis of the foot to support the foot of the patient;
said vertical strut comprising:
a first side margin and a second side margin opposed to said first side margin,
a first strut posterior layer comprised of polypropylene and connecting said first and second opposed side margins, said side margins extending downwardly from said cuff, said first opposed side margin continuing downwardly to pass on said first side of said heel cup and said second opposed side margin continuing downwardly to pass on said second side of said heel cup,
a second strut anterior layer comprised of polyethylene and connected to said first and second side margins, said second strut anterior layer extending from said cuff to said heel cup, said first and second layers forming a housing having an interior center, and
a third strut layer located in said interior center between said first and second layers and comprised of polyethylene, said third layer extending downwardly along said interior center from said cuff to provide a flexible interior to said vertical strut; and
an energy pathway extending along said vertical strut for transferring kinetic energy, said energy pathway branching at said heel cup along said first and second side margins.
11. The orthotic device of claim 10 , wherein
said third strut layer communicates with said energy pathway.
12. The orthotic device of claim 11 , wherein
said third strut layer terminates at said branch of said energy pathway.
13. The orthotic device of claim 10 , wherein
said energy pathway terminates in said foot plate.
14. The orthotic device of claim 10 , wherein
said first strut layer has a curvature for conforming to the calf.
15. The orthotic device of claim 10 , wherein
said second strut layer has a curvature for conforming to the calf.
16. The orthotic device of claim 10 , further comprising
an attachment strap disposed at said cuff.
17. An orthotic device comprising:
a cuff for securing the device about a calf of a patient;
a heel cup having first and second sides for supporting the heel of the patient therein;
a vertical strut extending between said cuff and said heel cup to connect said cuff to said heel cup;
a foot plate integral with said heel cup and extending from said heel cup along the longitudinal axis of the foot to support the foot of the patient;
said vertical strut comprising:
a first side margin and a second side margin opposed to said first side margin,
a first strut posterior layer comprised of polypropylene and connecting said first and second opposed side margins, said side margins extending downwardly from said cuff, said first opposed side margin continuing downwardly to pass on said first side of said heel cup and said second opposed side margin continuing downwardly to pass on said second side of said heel cup,
a second strut anterior layer comprised of polyethylene and connected to said first and second side margins, said second strut anterior layer extending from said cuff to said heel cup, said first and second layers forming a housing having an interior center, and
a third strut layer located in said interior center between said first and second layers and comprised of polyethylene, said third layer extending downwardly along said interior center from said cuff to provide a flexible interior to said vertical strut.