Below-knee orthotic device
A below-knee orthotic device in which dorsal flexion and plantar flexion are enabled by a support spring connecting a lower leg sleeve and a foot sleeve. The support spring is clamped in the foot sleeve, so that a gap is formed between the heel part and the foot sleeve, wherein bending of the support spring in stepping direction is limited through a stop on the foot sleeve.
1. A below-knee orthotic device, comprising:
a lower leg sleeve adapted to envelop the lower leg;
a foot sleeve;
at least one support spring;
said lower leg sleeve hingedly connected to said foot sleeve by said support spring; and
a stop disposed on said foot sleeve;
wherein:
in a position of rest, a gap is formed between a portion of said foot sleeve and a portion of said support spring;
in a stepping direction, bending of said support spring is limited by contacting said stop; and
said stop is releasably secured with a rear face of said foot sleeve or on said support spring.
2. The below-knee orthotic device in accordance with claim 1 , wherein in the position of rest, there is no contact between a heel part or a part of said support spring on a lower leg side and a rear face of said foot sleeve.
3. The below-knee orthotic device in accordance with claim 1 , wherein a surface of said stop is set to be parallel with, or inclined relative to a contacting surface of said support spring when said stop and said support spring enter into contact with each other.
4. The below-knee orthotic device in accordance with claim 3 , wherein said stop is a wedge.
5. The below-knee orthotic device in accordance with claim 4 , wherein said support spring contacts said stop starting from an angle β≧5°.
6. The below-knee orthotic device in accordance with claim 1 , wherein said support spring includes a reversing curvature in a heel part and two end portions, the heel part and the two end portions support a lower leg rear side or a sole of the foot in a longitudinal and/or transverse direction.
7. The below-knee orthotic device in accordance with claim 1 , wherein said support spring is connected with said foot sleeve via an end portion on a foot side of said support spring.
8. The below-knee orthotic device in accordance with claim 1 , wherein said lower leg sleeve is adjustable in height.
9. The below-knee orthotic device in accordance with claim 1 , wherein said support spring is a leaf spring.
10. The below-knee orthotic device in accordance with claim 1 , wherein said support spring is a leaf spring made of fiber reinforced plastic.
11. The below-knee orthotic device in accordance with claim 1 , further comprising a releasable engagement means whereby said support spring and said foot sleeve are releasably connected from a predetermined inclination angle δ.
12. The below-knee orthotic device in accordance with claim 10 , wherein said leaf spring is made of carbon fiber reinforced plastic.
13. The below-knee orthotic device in accordance with claim 1 , wherein said support spring contacts said stop starting from an angle β≧5°.
14. The below-knee orthotic device in accordance with claim 1 , wherein said stop is disposed on said support spring.