Ventilated prosthetic liner
A prosthetic liner has a ventilated structure communicating with an interior volume to an exterior of the prosthetic liner, thereby permitting a transfer of air and moisture therebetween. The prosthetic liner includes a facing layer defining a periphery of at least part of the interior volume of the liner, and forming a plurality of apertures extending therethrough. A cushion layer is juxtaposed to the facing layer and forms a lattice structure including a plurality of interstices in communication with the apertures of the facing layer.
1. A prosthetic liner defining a proximal end and a distal end and forming an interior volume, the liner having a body region extending from the proximal end distally toward a distal end area along an axis, the prosthetic liner comprising:
a cushion layer located at least within the body region and forming a predetermined lattice structure including a plurality of sub-layers forming a plurality of interstices therebetween, the cushion layer defining a first surface oriented toward the interior volume and a second surface opposite the first surface;
a facing layer located along the first surface of the cushion layer, the facing layer forming a predetermined pattern defining a plurality of apertures extending through a thickness of the facing layer, the plurality of apertures communicating with the plurality of interstices to permit a transfer of air and moisture from the interior volume of the prosthetic liner through the facing layer and the cushion layer; and
a distal region forming a distal cup, the distal region securing to the body region such that the distal cup is formed from at least one layer chemically bonded to the cushion layer, wherein the at least one layer of the distal region being vapor and moisture impermeable and defined by a solid mass of elastomeric material, the elastomeric material being a curing material that is sufficiently fluid to blend with the cushion layer at an interface thereof;
wherein the cushion layer defines a tapering thickness extending from a distal end of the body region to the proximal end.
2. The prosthetic liner of claim 1 , wherein the cushion layer has a thickness greater than the thickness of the facing layer.
3. The prosthetic liner of claim 1 , wherein the facing layer is formed from an elastomeric material having a lower durometer than at least one material forming the cushion layer.
4. The prosthetic liner of claim 1 , wherein the facing layer has generally a non-apertured surface area having generally a ratio of 5:1 to the apertures.
5. The prosthetic liner of claim 1 , wherein a matching layer is disposed between the facing layer and the cushion layer, the matching layer having a predetermined pattern of apertures corresponding to the predetermined pattern of apertures of the facing layer, the matching layer being formed from a material having a higher durometer than the facing layer, wherein the cushion layer, the facing layer, and the matching layer share at least a blended region in which materials of the layers intermix to form the permanent chemical bond without adhesive.
6. The prosthetic liner of claim 1 , wherein the plurality of sub-layers includes a first sub-layer formed by a first plurality of filaments oriented in a first direction forming part of a thickness of the cushion layer, each of the filaments of the first plurality of filaments being spaced apart from one another.
7. The prosthetic liner of claim 6 , wherein the plurality of sub-layers includes a second sub-layer formed from a second plurality of filaments oriented in a second direction different from the first direction and forming part of the thickness of the cushion layer, each of the filaments of the second plurality of filaments being spaced apart from one another.
8. The prosthetic liner of claim 7 , wherein the first and second plurality of filaments are chemically and integrally bonded to one another without an adhesive and are directly adjacent to one another, such that clearances between each of the filaments in the first and second plurality of filaments form said interstices.
9. The prosthetic liner of claim 7 , wherein the predetermined lattice structure is dictated by at least the first and second plurality of filaments.
10. The prosthetic liner of claim 1 , wherein the cushion layer includes at least first and second layers of a plurality of filaments, said tapering thickness includes an omission of the first layer of a plurality of filaments at a location relative to an axis of the prosthetic liner.
11. The prosthetic liner of claim 1 , wherein the facing layer has a generally uniform thickness in the body region of the prosthetic liner.
12. The prosthetic liner of claim 1 , wherein the at least one layer of the distal region including first and second layers, wherein at least one of the first and second layers overlaps at least one sub-layer of the cushion layer.
13. The prosthetic liner of claim 1 , further comprising a seal region located distally from the body region, the seal region including at least one sub-layer of the cushion layer and at least one layer of the distal cup.
14. The prosthetic liner of claim 13 , wherein the facing layer terminates at the seal region, and an innermost layer of the distal region chemically bonding to the facing layer and forming a periphery of the inner volume of the prosthetic liner within the seal and distal regions.
15. The prosthetic liner of claim 13 , further comprising a porous textile layer secured to the second surface of the cushion layer, said textile layer defining an entirety of an exterior surface of the prosthetic liner within the body region.
16. A prosthetic liner defining a proximal end and a distal end and forming an interior volume, the prosthetic liner having a body region extending from the proximal end distally toward the distal end along an axis, the prosthetic liner comprising:
a cushion layer located at least within the body region and forming a predetermined lattice structure including a plurality of sub-layers forming a plurality of interstices therebetween, the cushion layer defining a first surface oriented toward the interior volume and a second surface opposite the first surface;
a facing layer located along the first surface of the cushion layer, the facing layer forming a predetermined pattern defining a plurality of apertures extending through a thickness of the facing layer, the plurality of apertures communicating with the plurality of interstices to permit a transfer of air and moisture from the interior volume of the prosthetic liner through the facing layer and the cushion layer; and
a distal region forming a distal cup, the distal region securing to the body region such that the distal cup is formed from at least one layer chemically bonded to the cushion layer, wherein the at least one layer of the distal region being vapor and moisture impermeable and defined by a solid mass of elastomeric material;
wherein the plurality of sub-layers includes a first sub-layer formed by a first plurality of filaments oriented in a first direction forming part of a thickness of the cushion layer, each of the filaments of the first plurality of filaments being spaced apart from one another; wherein the plurality of sub-layers includes a second sub-layer formed from a second plurality of filaments oriented in a second direction different from the first direction and forming part of the thickness of the cushion layer, each of the filaments of the second plurality of filaments being spaced apart from one another;
wherein the first and second plurality of filaments are chemically and integrally bonded to one another without an adhesive and are directly adjacent to one another, such that clearances between each of the filaments in the first and second plurality of filaments form said interstices;
wherein the cushion layer defines a tapering thickness extending from a distal end of the body region to the proximal end, the tapering thickness comprising the first sub-layer and an omission of the second sub-layer at the proximal end.