Range of motion walker boot
View Patent ↗The invention comprises a range of motion device for use between a first member and a second member, rotatable connection between the first member and the second member, a range of motion limiting elements engageable on the first member and acting on the second member to limit the range of rotational movement of the second member relative to the first member.
1. A range of motion device for use between a first member and a second member, comprising a rotatable connection between the first member and the second member, a range of motion limiting means engageable on the first member and acting on the second member to limit the range of rotational movement of the second member relative to the first member, the range of motion limiting means comprising a pair of rotatable annular members each having an outward protrusion, the pair of rotatable members being engageable on the first member at selected ones of a plurality of allowable positions so that the distance between the outward protrusions can be varied so as to alter the maximum range of movement of the second member relative to the first member.
2. A range of motion device as claimed in claim 1 , wherein the rotatable connection means comprises an aperture through the first member and a trunnion on the second member positionable in the aperture in the first member.
3. A range of motion device as claimed in claim 2 wherein a fixed substantially annular member surrounds the aperture and the rotatable members are engageable on the fixed substantially annular member.
4. A range of motion device as claimed in claim 1 , wherein a fixed substantially annular member surrounds the aperture and the rotatable members are engageable on the fixed substantially annular member.
5. A range of motion device as claimed in claim 1 , wherein the fixed annular member has outwardly facing splines and each rotatable annular member has inwardly facing splines engageable onto the outwardly facing splines.
6. A range of motion device as claimed in claim 5 wherein lock means are provided to hold the first member the second member and the further annular members in engagement.
7. A range of motion device as claimed in claim 6 wherein the lock means comprise a plate with a protrusion thereon and means to engage that protrusion with the trunnion.
8. A range of motion device as claimed in claim 7 wherein the lock means further include a bore in, or protrusion on, the plate to engage the trunnion.
9. A range of motion device as claimed in claim 8 wherein further lock means are provided to engage the plate with the first member.
10. A range of motion device as claimed in claim 9 wherein the further lock means comprise slots about the annular protrusion and hook members on the plate engageable into the slots in a rotatable manner to engage the hook members with material surrounding the slots.
11. A range of motion device as claimed in claim 7 wherein further lock means are provided to engage the plate with the first member.
12. A range of motion device as claimed in claim 11 wherein the further lock means comprise slots about the annular protrusion and hook members on the plate engageable into the slots in a rotatable manner to engage the hook members with material surrounding the slots.
13. A range of motion device as claimed in claim 5 wherein the second member has a detent thereon positionable in the space between the outwardly extending protrusions.
14. A range of motion device as claimed in claim 1 , wherein a single further annular member is provided having inward splines engageable onto the outwardly facing splines on the annular member.
15. A range of motion device as claimed in claim 14 wherein the second member has a detent thereon positionable in the space between the outwardly extending protrusions.
16. A range of motion device as claimed in claim 1 , wherein the second member has a detent thereon positionable in the space between the outwardly extending protrusions.