Dual durometer silicone liner for prosthesis
AssigneeOssur Hf
InventorsOssur Kristinsson, Hilmar Br. Janusson
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Abstract
A silicone elastomer suspension liner for a prosthesis includes a soft inner silicone elastomer layer and a relatively harder outer silicone elastomer layer, with both layers being formulated to provide desired physical characteristics of the liner. An elasticity controlling matrix material and a prosthesis connecting element may be provided in the distal end area of the liner. The softer inner layer closely conforms to the residual limb that is to be fitted to a prosthesis while the harder outer layer provides durability and strength for the liner.
Claims21
A residual limb suspension liner for a prosthesis comprising:
- a closed-ended, air-tight tubular sleeve adapted to envelop the distal end area of a residual limb;
- said sleeve formed over its entire length of inner and outer layers of different silicone elastomers, said layers being contiguous and integrally joined to each other along the entire outer surface of the inner layer;
- the silicone elastomer of said inner layer having a Shore A hardness that is below Shore A practical measurement, and the silicone elastomer of said outer layer having Shore A hardness of approximately 6.
A residual limb suspension liner for a prosthesis comprising:
- a closed-ended, air-tight tubular sleeve adapted to envelop the distal end area of a residual limb;
- said sleeve formed over its entire length of inner and outer layers of different silicone elastomers, said layers being contiguous and integrally joined to each other along the outer surface of the inner layer;
- the silicone elastomer of said inner layer having a lower hardness than the hardness of the silicone elastomer of said outer layer;
- and
- an elasticity controlling matrix at least in a distal end area of said liner, said matrix causing said distal end area to be substantially inelastic in the axial direction without interfering with radial elasticity of the silicone elastomers within a range of distension of the liner during normal use.
A residual limb suspension liner for a prosthesis comprising:
- a closed-ended, air-tight tubular sleeve adapted to envelop the distal end area of a residual limb;
- said sleeve formed over its entire length of inner and outer layers of different silicone elastomers, said layers being contiguous and integrally joined to each other along the outer surface of the inner layer;
- the silicone elastomer of said inner layer having a lower hardness than the hardness of the silicone elastomer of said outer layer;
- said inner and outer layers have the following characteristics:
- ______________________________________ Characteristic Inner Layer Outer Layer ______________________________________ Tensile Strength (min.) (p/in) 233 350 Modulus 100% (psi) 8 21 Modulus 200% 26 53 Modulus 500% 61 139 Tear Strength (nick) (p/in) 49 84 (0.002") (0.005"). ______________________________________
Dependencies are inferred from the claim text.