Orthopedic foot insert
A comfort insert to be worn inside a person's footwear to alleviate friction between the person's foot and surfaces of the footwear and possibly provide some cushioning, and a method of assembling such a comfort insert. A body portion of the insert may be of crumpled thin plastic film material, and a containment element may be of fine-filament open mesh netting. A portion of an exterior surface of the insert may be provided with a nonslip or adhesive coating to assist in keeping the comfort insert in a desired location.
1. A comfort system to protect a user's foot against friction between a foot and footwear, the comfort system comprising:
footwear; and
a comfort insert, comprising:
an inner body component including at least one sheet of folded or crumpled, flexible, thin plastic film material forming a plurality of layers; and
a flexible outer containment component encompassing and securely containing the inner body component and thereby limiting an ability of the comfort insert to spread beyond a predetermined size, while permitting the comfort insert to be depressed into a flattened configuration to fit between the user's foot and an interior surface of the footwear,
wherein the flexible outer containment component comprises an open mesh netting material with a mesh opening size in the range of 0.20 inch- 0.75 inch, wherein the thin plastic film material has a thickness in the range of 0.0003 inch- 0.003 inch, and wherein the flexible outer containment component encloses the inner body component such that the inner body component remains a loose mass within the flexible outer containment component allowing the plurality of layers to slip and slide along one another's surfaces when the comfort insert is used in the footwear.
2. The comfort system of claim 1 , further comprising a low friction fluid located within the containment component.
3. A method of enhancing comfort in footwear, comprising:
placing a comfort insert into footwear in a location configured to be between a user's foot and a surface of the footwear when the footwear is worn by a user, the comfort insert comprising:
a shear-reducing body element including a plurality of layers comprised of a thin plastic film material and a low friction fluid between the plurality of layers, the thin plastic film material folded or crumpled to form the plurality of layers; and
a flexible containment element surrounding and enclosing the body element and comprising an open mesh netting material with a mesh opening size in the range of 0.20 inch- 0.75 inch, wherein the mesh openings are large enough to expose portions of the thin plastic film material for user contact and to allow the thin plastic film material to bulge outward through the mesh openings, wherein the flexible containment element encloses the body element such that the shear-reducing body element remains a loose mass within the flexible containment element allowing the plurality of layers to slip and slide along one another's surfaces when the comfort insert is used in the footwear.
4. The comfort system of claim 2 , wherein the low friction fluid comprises air or a lubricant.
5. The comfort system of claim 1 , wherein the flexible containment element includes an exterior portion including a nonslip outer surface.
6. The comfort system of claim 1 , wherein the thin plastic film material has a static coefficient of friction of 0.5 or below.
7. The method of claim 3 , wherein the low friction fluid comprises air or a lubricant.
8. The method of claim 3 , wherein the thin plastic film material has a thickness in the range of 0.0003 inch −0.003 inch and wherein the mesh opening size is at least 500 times larger than the thickness of the plastic film material.
9. The method of claim 3 , wherein the flexible containment element includes an exterior portion including a nonslip outer surface.
10. The method of claim 3 , wherein the thin plastic film material has a static coefficient of friction of 0.5 or below.
11. The method of claim 3 , further comprising a filament or thread tied around the flexible containment element to maintain the shear-reducing body element within the flexible containment element.