Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg – Foot
Patent
1999-02-05
2000-12-26
Snow, Bruce
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
Foot
A61F 266
Patent
active
061652288
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a forefoot pail intended to be comprised in a foot means adapted to cooperate with a support part comprised in a foot prosthesis, and a foot means comprising a combined heel part and forefoot part for fastening onto the support part.
BACKGROUND OF THE INVENTION
Foot prostheses of different types are known. The prostheses are usually designed so that an ordinary shoe can be used on the prosthesis. At a certain heel height, which can be adjusted during manufacturing of the prosthesis adapted to an individual. the prosthesis feels comfortable to walk on and to load, but without a shoe or with a different heel height the prosthesis is no longer comfortable to use since the angle of the foot with respect to the ground is no longer correct.
The most common solution to the above problem is to either angle the whole foot prosthesis downwards and forwards, or to lower the heel part when, for example, one is to walk without a shoe. Angling the prosthesis downwards does not produce an anatomically correct foot shape, i.e. one does not achieve the type of foot shape which is necessary during the use of a higher heel, and if alternatively the heel part is lowered, this instead results in a lengthening of the leg which will cause discomfort, especially in the back.
WO93/24080 (same applicant) describes the general design of a foot prosthesis with a support part and a foot means which cooperates with the support part, wherein the foot means comprises a forefoot part arranged so that it is slidably fixed to the support part in its axial direction and separately a heel part intended to be arranged at the lower end of the support part.
SE-B-8504225-5 a foot prosthesis is described having a central part which supports the sole, heel and leg parts. In this prosthesis the heel is movably arranged in relation to the central part of the prosthesis and to the part of the sole of the foot which is fixedly joined with the central part. Movement of the heel is obtained by the latter being connected with the rear part of the central part by means of a bar which can be locked in a hole in said part and which in the unlocked position is displaceable in relation to the central part for adjusting the heel in relation to the foot sole. In this device a lengthening of the leg is obtained by the hole being moved downwards in relation to a reference point, e.g. the knee of the user.
U.S. Pat. No. 4,547,913 describes a completely different solution to the problem. Here the prosthesis is made of three rigidly connected parts, the leg part, the foot part and the heel part made of fibre reinforced resin, where the material and design of the parts gives flexibility to the prosthesis.
In U.S. Pat. No. 5,181,933 is described a prosthesis foot comprising essentially two curvilinear parts of which one extends from the attachment part to the toe part of the foot. Halfway at between the two ends and underneath the first curvilinear part a second curvilinear part is attached in such a way as to provide the heel part of the foot prostheses.
In FR C 907 306 a prosthesis foot is described, in which the foot-part and the toes are separated by an opening. The parts are connected through a number of steel bands. The foot and the toe part are also connected through a damper comprising a cylinder and a piston and the damper connected to the foot and the toe part respectively.
In DE C 841 192 another foot prostheses is described which comprises a foot prostheses having a toe part which may be bent. The two parts are connected through a bendable sole and are also connected via a flexible elongated rubber piece extending into two holes in the two parts respectively.
These three prostheses comprise a prostheses foot which is complete in the sense of the forefoot and the heel being directly connected to each other.
U.S. Pat. No. 5,181,933 is described a prosthesis foot comprising essentially two curvilinear parts of which one extends from the attachment part to the toe part of the foot. Halfway between the two ends
REFERENCES:
patent: 5116384 (1992-05-01), Wilson et al.
patent: 5139525 (1992-08-01), Kristinsson
patent: 5290319 (1994-03-01), Phillips
patent: 5514185 (1996-05-01), Phillips
patent: 5695527 (1997-12-01), Allen
patent: 5888239 (1999-03-01), Wellershaus et al.
Pro-Pel AB
Snow Bruce
LandOfFree
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