Brace hinge with telescoping pad
A hinge which can be included on a brace is disclosed. The hinge can include a first arm, a second arm, and a hinge plate. The first and second arms can be connected to the hinge plate for rotation about first and second axes, respectively. The hinge plate can include an internally threaded aperture. The hinge can also include a force application assembly and an adjustment assembly. The adjustment assembly can include an externally threaded lead screw engaged with the internally threaded aperture, and having a medial end connected to the force application assembly and a keyed bore. The adjustment assembly can include a drive key having a keyed shaft slidingly engaged with the keyed bore and a knob connected to the drive key such that rotation of the knob causes displacement of the force application assembly.
1. A hinge comprising:
a first arm;
a second arm;
a hinge plate, the first arm connected to the hinge plate for rotation about a first axis and the second arm connected to the hinge plate for rotation about a second axis, the hinge plate including an internally threaded aperture;
a force application assembly;
an adjustment assembly including
an externally threaded lead screw engaged with the internally threaded aperture of the hinge plate and having
a medial end connected to the force application assembly, and
a keyed bore extending along a longitudinal axis of the externally threaded lead screw from a lateral end of the externally threaded lead screw toward the medial end,
a drive key having a keyed shaft slidingly engaged with the keyed bore,
a knob connected to a lateral end of the drive key such that rotation of the knob causes rotation of the drive key which causes rotation of the externally threaded lead screw through engagement of the keyed shaft and the keyed bore, wherein the rotation of the externally threaded lead screw causes the externally threaded lead screw to move laterally or medially along the longitudinal axis relative to the hinge plate and the drive key to cause lateral or medial displacement of the force application assembly, and wherein the keyed bore slides laterally or medially along keyed shaft of the drive key as the keyed bore and the keyed shaft rotate together, and
a cover having an opening positioned on an anterior side or a posterior side of the cover, wherein the knob and drive key are positioned between the cover and the hinge plate, and wherein the knob extends at least partially through the opening.
2. The hinge of claim 1 , the adjustment assembly further comprising:
a dial gear comprising a plurality of notches; and
a tooth extending from the knob that engages with the plurality of notches during at least a portion of a full rotation of the knob such that rotation of the knob causes rotation of the dial gear.
3. The hinge of claim 2 , the adjustment assembly further comprising a pawl having a free end that engages with the plurality of notches of the dial gear.
4. The hinge of claim 3 , wherein the pawl is configured to prevent rotation of the dial gear when the tooth of the knob and the notches of the dial gear are not engaged.
5. The hinge of claim 2 , the dial gear comprises a missing notch that limits rotation of the knob.
6. The hinge of claim 2 , wherein a boss extends from an interior surface of the cover, and wherein the dial gear is mounted on and rotates around the boss.
7. The hinge of claim 1 , further comprising a spacer between the force application assembly and the hinge plate, the externally threaded lead screw extending through an aperture in the spacer.
8. The hinge of claim 7 , wherein the spacer comprises foam.
9. The hinge of claim 1 , wherein the hinge plate comprises a medial hinge plate, the hinge further comprising:
a lateral hinge plate, the first and second arms positioned between the lateral hinge plate and the medial hinge plate.
10. The hinge of claim 9 , wherein the keyed shaft of the drive key extends through an aperture in the lateral hinge plate.
11. The hinge of claim 1 , wherein rotation of the knob causes lateral or medial displacement of the externally threaded lead screw through the internally threaded aperture of the hinge plate.
12. The hinge of claim 1 , wherein the keyed bore of the externally threaded lead screw comprises a D-bore shape and the keyed shaft of the drive key comprises a D-bore shape.
13. The hinge of claim 1 , wherein the force application assembly comprises:
a loading plate connected to the medial end of the externally threaded lead screw; and
a condyle shell.