Blank for producing a soft wall inside socket

Details Blank for producing a soft wall inside socket Blank for producing a soft wall inside socket

1998-05-13

2000-02-29

Yu, Mickey

Prosthesis (i.e., artificial body members), parts thereof, or ai

Leg

Socket holder

623 33, A61F 280, A61F 260

Patent

active

060304189

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a blank for producing a soft wall inside socket of a prosthesis comprising a pre-shaped side wall formed of a thermoplastic material, an inside liner and an outside sheathing, the blank forming a receiving space for receiving a shank stump or lower leg stump, having an opening restricted by an edge of the side wall for inserting the shank stump.
Such a blank is known from the U.S. Pat. No. 4,635,626.
A blank for a soft wall inside socket is known consisting of a thermoplastic material. The blank is pre-shaped such that it forms a receiving space having an opening restricted by an edge for receiving a shank stump. On the inner side of the receiving space a liner is provided made of body compatible material. At the outer side a sheathing of wear resistant material is deposited. The liner and the sheathing are sewn to each other at the edge of the opening such that the edge is formed rounded. For individually adapting the blank to a shank stump of an amputee the blank is heated to about 80.degree. C. The blank is pushed onto the shank stump and applied with excess pressure in a known manner. Thereby, the blank is precisely adapted to the individual shank stump. After cooling of the blank it keeps its form so that the soft wall inside socket is completed.
The above-described blank has the disadvantage that in a normally necessary adaption of its length along the shank stump the edge cannot be perfectly closed because of the thickness of the thermoplastic material, which can lead to substantial drawbacks during wearing.


SUMMARY OF THE INVENTION

It is the object of the invention to provide a blank of a thermoplastic material for producing a soft wall inner socket which can be individually adapted in the length, and the edge of the receiving opening of which can be individually cut and formed rounded.
According to the invention a blank is provided for producing a soft wall inside socket of a prosthesis comprising a pre-shaped side wall formed of a thermoplastic material, an inside liner and an outside sheathing, the blank forming a receiving space for receiving a shank stump, having an opening restricted by an edge of the side wall, for inserting the shank stump, wherein, for the purpose of adapting the height of the edge of the blank to the shank stump to be received, a slit-shaped recess runs along the edge and extends from the edge into the side wall by a predetermined depth.
By providing the slit-shaped recess it is possible to adapt the height of the edge to the individual shank stump and to connect thereafter the liner with the sheathing.
The invention also provides a blank wherein the slit-shaped recess is arranged in the center of the side wall such that a double wall portion is formed with an inner wall adjacent to the inner liner and an outer wall adjacent to the outer sheathing, whereby the thickness of the inner wall essentially corresponds to the thickness of the outer wall. Preferably the side wall is formed integrally and the material is a thermoplastic foam material. Generally, the depth (T) of the slit-shaped recess is about 2 to 4 cm and the width (B) is about 1/3 to 1/2 of the thickness (D) of the side wall.
A soft wall inside socket is formed of a blank, as described above, such that the height of the soft wall inside socket is adapted to the shank stump by cutting off a portion of the side wall, of the outer sheathing and of the inner liner, and that thereafter the outer sheathing is connected with the inner liner. Preferably, the soft wall inside socket is adapted to the shank stump by cutting such that the outer sheathing and an outer wall portion, which is between the slit-shaped recess and the outer sheathing, are shortened more than the inner liner and an inner wall portion, which is between the slit-shaped recess and the inner liner, are shortened.
Further features and advantages of the invention will be apparent from the description of embodiments with reference to the figures.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1

REFERENCES:
patent: 2025835 (1935-12-01), Trautman
patent: 3309714 (1967-03-01), Porten
patent: 3600717 (1971-08-01), McKeehan
patent: 4274166 (1981-06-01), Chambers
patent: 4479272 (1984-10-01), Beldzisky
patent: 4635626 (1987-01-01), Lerman
patent: 5480455 (1996-01-01), Norvell

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