Heater for fitting orthoses to individual body joint
An orthosis is fitted to a body joint, in a preferred embodiment the equine fetlock, by locating the center of rotation (COR) of the joint; measuring the bones comprising the joint at points located with respect to the COR; selecting the appropriate orthosis from a selection of models thereof; and custom-fitting the orthosis to the individual by heating it to soften a layer of thermoformable foam on the interior of the orthosis, and clamping the orthosis in place over the body joint. A kit of tools for performing the measurements is disclosed, as are a method for location of the COR of the body joint by palpation and a preferred heater.
1. A heating apparatus for heating the interior surface of an orthosis, said orthosis comprising proximal and distal cuffs joined to and spaced from one another by a pivot structure, said cuffs each being of generally cylindrical configuration defining first and second ends and with an open side to allow the cuffs of the orthosis to be disposed over a body joint, and each cuff comprising an outer shell and an inner layer of thermoformable foam,
said heating apparatus comprising a source of a stream of hot air, a central plenum and first and second platens,
said first and second platens being spaced axially from said plenum, such that said orthosis can be assembled within said heating apparatus, with the plenum disposed between said proximal and distal cuffs, and said proximal and distal cuffs fitting between said plenum and said first and second platens,
whereby said first and second ends of said proximal and distal cuffs are juxtaposed to surfaces of said plenum and said platens so as to be in generally sealing relationship therewith, and
said plenum being connected to said source of a stream of hot air, and defining a plurality of ducts in communication with interior volumes defined by the interior surfaces of said proximal and distal cuffs and said surfaces of said plenum and said platens juxtaposed thereto.
2. The heating apparatus of claim 1 , wherein the degree of sealing between said first and second ends of said proximal and distal cuffs juxtaposed to surfaces of said plenum and said platens is selected in conjunction with said interior volumes and said ducts such that the interior surfaces of said proximal and distal cuffs are heated to a substantially equal degree.
3. The heating apparatus of claim 2 , wherein the degree of sealing provided between said proximal and distal cuffs and said surfaces of said plenum and said platens juxtaposed thereto is controlled by provision of geometric features on selected surfaces of said plenum and said platens in order to provide a degree of air leakage therebetween.
4. The heating apparatus of claim 1 , wherein the cuffs of the orthosis each further comprise a first intermediate layer of molded foam between the outer shell and the inner layer of thermoformable foam, said intermediate layer being contoured to fit the body joint.