DE2329271A1 - ARTIFICIAL MEMBER, LIKE ARM, LEG PROSTHESIS OR DGL - Google Patents

Description

DEPI ..- ING. WOLF D- β FHANKFUHT AM MAIN Company »- · γηαηιγοιτα.μ., 10.5.73

room «Mil] (5 20 23

Georg Hartmann «n«., ™ ... 11 966-III-

5921 Arfeld ~~ ™ «-i» i44 Gr

Artificial limb, such as arm, leg prosthesis or the like.

The invention relates to an artificial limb, such as an arm, leg prosthesis or the like. Consisting of one of the natural ones Link shape made of wood shaped body.

Artificial limbs of the type mentioned are well known. Such artificial limbs are made of poplar wood, willow wood, for example or another light wood, namely they are carved out of solid wood pieces and more as required or less hollowed out. Due to the adaptation necessary to the natural shape of the limb, the manufacturing process is relative laborious. In addition to the relatively high weight (for reasons of processing and strength, there are limits to the wall thickness measurement set) such artificial limbs have the disadvantage that eie to a certain extent are subject to the effects of moisture and are also in factory production taking into account a variety of different

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Limb forms Frenzen set so that the orthopedic mechanic as a rule must be consulted for a corresponding adaptation work to the respective individual case.

The invention is based on the object of overcoming these disadvantages, i.e. an artificial limb is to be created, This is from the outset in terms of weight, but also in terms of manufacture, with at least the same load capacity or strength can be produced more easily with less wood loss, which is insensitive to moisture and which is individual in large numbers in factory production Formal requirements can be better taken into account.

This object is achieved with an artificial member of the type mentioned according to the invention in that the molded body multilayered in shell form from several suitably cut Wood veneer layers are formed from at least two scales, and the shells are glued together in a boil-proof and waterproof manner.

This inventive design of the shaped body this corresponds to a distortion-free plywood connection c high strength, thanks to the boil-proof and water-resistant conferment auci is insensitive to moisture. Through the! Lohe Festicke- "r such plywood associations can be the wall thicknesses

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keep accordingly thin and the whole artificial limb will be correspondingly light. There is practically only wood waste when cutting the veneer layers, but this is cheaper Can keep cutting arrangement to a minimum.

On the one hand, such artificial limbs can be derived from orthopedics Machinists work to a lesser extent from wood, but on the other hand, due to the training according to the invention From the manufacturing side, a larger range of different shapes can be manufactured and offered.

It has been shown that one composed of two shells Artificial limb, the edges of which are directly butted together and glued using the high-strength gluing agents available today certainly meets the strength requirements.

However, it is more advantageous, and there are no manufacturing difficulties to prevent the edge edges of the Shells to be shanked in opposite directions and in the shank area to be glued together, also boil-proof and waterproof.

But you can also proceed in such a way that the veneer layers of one and the other shell are slightly offset from one another, the resulting finger-joint-like edges of the shells being fitted into one another and glued. _ ₄ _

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As a result, it is also advantageous in the joint area of the two Shells a lock hole bandage with its beneficial Properties achieved.

If you want to avoid such a shaft or finger-jointed connection of the shells, you can also use the artificial limb train in such a way that the glued connection areas of the two shells with at least one face veneer layer are covered and glued.

Since the veneer layers of the bowls are glued in presses with very high pressures, there is definitely the possibility of turning the edge areas of the bowls a little inwards Press cranked so that the top veneer layer can then be attached in the cranked area of the glued together shells. Instead of such a cover veneer layer, a strip of other material can of course also be used Material, e.g. Light metal strips, plastic strips or the like. Verden provided. The veneer layers are purposely glued together with alternating grain directions, as is usual in the manufacture of plywood.

Finally, the basic idea of the invention leaves a A further variant, which in itself is practicable without any further details, but nevertheless with a relatively large amount of machinery connected is.

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You can namely train the artificial limb in such a way that the individual veneer layers with their edges in the shape of a shell are each offset from one another by a certain angle, preferably by about 90 °, and glued. In this training two layers of veneer are made into a shell shape and glued together. The next two layers of veneer are now applied to the first two veneer layers offset by about 90 ° with respect to their abutment edge, glued etc. depending on the number of veneer layers required. Since this must be done on or in molds and the internal The shape of the artificial limb corresponds to its outer shape, which is geometrically difficult to define, of course it must be ensured that the inner support tool can be pulled out of the artificial limb again after completion can, which means that the inner support tool must be formed in several parts.

Such a support tool can, for example, in principle be designed in such a way that it is made up of several strips Rods that are grouped around a central rod as an inner support rod. Do you want the support tool remove from the finished, large-scale artificial limb, all you have to do is pull the central support rod first, after which the outer rods grouped around it, each of which is a part of the artificial limb shape on their outer flanks correspond, can be drawn accordingly, since they can evade towards the free center. _G_

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As illustrated _f , the outlay in terms of device is relatively large in this variant, but the artificial limb that can be produced with it then advantageously consists of several double shells, the joints of which are evenly distributed over the entire circumference.

The artificial limb according to the invention is illustrated below with reference to the drawing of exemplary embodiments explained in more detail.

Show in this illustration

Fig. 1 is a perspective view of the invention Artificial limb in the form of a lower leg prosthesis;

FIG. 2 shows a section through the lower leg prosthesis according to FIG. 1 in the simplest embodiment; FIG.

3 shows the shaft area two together in section connected shell parts;

4 shows, in section, another embodiment of the marginal edges of two shells to be connected;

5 shows, in section, a further embodiment of the peripheral edge enver connection of two shells and

6 shows, in section, a particular embodiment of the artificial limb.

Tn the embodiments shown is on an artificial limb referred to in the form of a lower leg prosthesis, without prostheses for the replacement of other limbs

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measured (thigh, forearm, upper arm, stump funnel or the like) should be excluded.

In the figures, 1 denotes the molded body, the veneer layers, 3, 4 the shells, 5 the shanked edges of the shells that are glued together in the shaft area 6, 7 the finger- jointed flanges of the shells and 8 face veneer layers. The curvatures and thicknesses of the veneer layers shown are not shown to scale and are only intended to clarify the arrangement and connection options.

The representations according to FIGS. 1-4 and 6 speak for themselves and do not require any further explanation. It is only ervähnt to Fig. 5 that the edges derSchalen 3, vie illustrated, Verden pressed with a bend 9 so that the fact may Verden glued in particular from the outside face veneer layers 8 in the resulting Exntiefungsbereich.

Of course, such a bend is not absolutely necessary, but such face veneers with gently tapering and clinging edges can easily also over the shell joints 10, the shaft areas 6 or the finger-joint-like joint areas according to fin. 4 are additionally arranged.

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The individual veneer layers 2 are self-evident among one another and in a known way also boil-proof and waterproof and glued with alternating wood fiber directions.

It should also be mentioned that artificial limbs of the type described, but also of the previously known type, require an articulated connection to the neighboring limb, for example the foot to the lower leg prosthesis or Lower leg prosthesis for stump funnel or the like .. Such joint fitting parts are previously in corresponding recesses or grooves of the solid wood prostheses and by riveting or the like. attached, the recess leading to a weakening the solid wood wall leads.

In the proposed artificial member, such a recess can advantageously, for example, in the sense of FIG. 5 through during the pressing process a corresponding bend can also be provided, or it is also possible to insert the hinge fitting directly into the Veneer layer association, preferably in the joint area, to be included so that only the hinge eye on the entire fitting is left the upper edge of the artificial limb protrudes. By appropriate riveting, in which the respective adjacent ends of the butting or overlapping veneer layers are detected, the joint of the veneer layers in this area receives a particularly good and additional hold.

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For the sake of simplicity, the integration of such a hinge fitting 11 is indicated in the upper part of FIG. 6. Of course opposite (but not shown here) a corresponding fitting is arranged. The riveting or screwing (not shown) is preferably carried out in such a way that all veneer layers are grasped, in particular also the two ends of the inner veneer layers. In the embodiment according to FIG. 5, the hinge fitting Ospw can be attached to the Step in place of the inner veneer top layer 8. The same applies to FIGS. 3 and 4.

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Claims (9)

- 10 claims 1.) Artificial limb, such as arm, leg prosthesis or the like. consisting of ^V one of the natural link shape wooden simulated molded body, characterized in that the shaped body (tj multilayered in shell form a plurality of correspondingly cut wood veneer layers (2) is formed of at least two shells (3,4) and the bowls (3,4) are glued together boil-proof and waterproof. 2. Artificial limb according to claim 1, characterized that the marginal edges (5) of the shells (3, 4) are each operated in opposite directions and in the area of the arm (6) are glued together. 3. Artificial limb according to claim 1, characterized that the individual veneer layers (2) in Shell shape with their edges each a certain to each other Angle are preferably offset by about 90 ° and glued (Fig. 6). 4. artificial limb according to claim 1, characterized in that the veneer layers (2) of the one and the other shell are slightly offset from one another 409881/0150 wherein the resulting finger-jointed edges (7) of the shells (3, 4) fit into one another and are glued. 5. Artificial limb according to any one of claims 1 to 4, characterized in that the glued connecting areas of the two shells (3 _t 4) are covered and glued with at least one face veneer layer (8). 6. artificial limb according to any one of claims 1 to 5, characterized in that for the attachment of Hinge fittings (11) are also pressed into the veneer layers (2) with corresponding inwardly cranked recesses. 7. Artificial limb according to claim 6, characterized in that the inwardly cranked recesses are arranged in the region of the veneer layer joint regions. 8. artificial limb according to any one of claims 1 to 5, characterized in that hinge fittings (11) between the joint or overlap areas of the furnies? - layers (2) embedded with and with these by riveting, screwing or the like. are connected. 409881/0150 9. artificial limb according to claim 8, characterized in that by riveting, screwing or the like. the adjacent veneer layers (2) are recorded. 409881/0150