Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arm or component and actuator or connector therefor – Elbow
Patent
1993-06-25
1995-08-22
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arm or component and actuator or connector therefor
Elbow
623 33, A61F 256, A61F 258
Patent
active
054435307
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an elbow fitting part for upper arm stumps, an elbow ball being connected by a hinged axle to the lower arm, configured as a hollow synthetic part, and being detainable by a latch-locking device in various bending positions, while the proximal connection to the upper arm shaft is created by means of a cast-in ring and an upper arm rotating Joint is provided for the adjustable rotation of the lower arm.
Known elbow fitting parts exhibit an upper arm rotating joint in the form of a sickle joint configured as a plane bearing and are therefore only suitable for limited upper arm stump lengths. In order to cater to long stumps, elbow fitting parts without a sickle Joint are used. Where these previously known elbow fitting parts exhibit a latch-locking device, this engages into a catch disposed on the outer periphery of the elbow ball.
SUMMARY OF THE INVENTION
The object of the invention is to design the elbow fitting part described in the introduction such that it is suitable for all upper arm stump lengths.
This object is achieved according to the invention by the fact that the upper arm rotating joint is configured as an annular bearing and the latch-locking device is a traction lock which is disposed outside the elbow ball and is integrated into a rotating connection forming a section of the hinged axle.
It is expedient, in this case, for the upper arm rotating Joint to comprise a bearing ring which is inserted into the elbow ball and is connected thereto in a rotationally secure manner and to exhibit an annular crosspiece which is embraced by a brake ring connected in a rotationally secure manner to the cast-in ring, the latter being twistable by 180.degree. in relation to the bearing ring (7).
The measures according to the invention enable the needs of patients having any optional stump length up to elbow exarticulation to be met with only one rotating joint, for the configuration of the upper arm rotating joint as an annular bearing instead of the previously used plane bearing means that the necessary space is acquired for virtually any optional stump length. As a result of the externally disposed traction lock, the geometry for long stumps is guaranteed; no constructional adaptation to different stump lengths is necessary.
Further features form the subject of the subclaims and are explained in greater detail in connection with further advantages of the invention, with reference to an illustrative embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the invention, serving as an example, is represented in the drawing, in which:
FIG. 1 shows an elbow fitting part in side view and partly in longitudinal section;
FIG. 2 shows the representation according to FIG. 1 rotated by 90.degree. and in longitudinal section;
FIG. 3 shows, on an enlarged scale, a detail from FIG. 2;
FIG. 4 shows, in exploded representation, a traction lock assembly;
FIG. 5 shows, in top view, a traction lock linked to a hinged plate bar;
FIG. 6 shows, in exploded representation, a further assembly of the traction lock according to FIG. 5;
FIG. 7 shows a brake ring in top view and
FIG. 8 shows a section view taken along the line VIII--VIII in FIG. 7.
DETAILED DESCRIPTION OF A PREFERRING EMBODIMENT
The elbow fitting part represented in FIGS. 1 and 2 essentially comprises a lower arm 1, which is configured as a hollow synthetic part and at whose upper end an elbow ball 2 is mounted pivotably about a hinged axle 3 and can be detained in various bending positions by a latch-locking device. For the proximal connection to an upper arm shaft (not represented), a cast-in ring 4 is provided, which is part of an upper arm rotating joint for the adjustable rotation of the lower arm 1. When the lower arm 1 swings freely, the extension is limited by a front stop which is made of Perlon wire 5 and which is fastened on the one hand to the elbow ball 2 and on the other hand to the lower arm 1.
The upper arm rotating joint comprises a bearing ring 7, which is inserted into the elbow
REFERENCES:
patent: 2033150 (1936-03-01), Radtke
patent: 2537338 (1951-01-01), Fishbein et al.
patent: 2572914 (1951-10-01), Chapman et al.
patent: 2812961 (1957-11-01), Brown et al.
patent: 2944846 (1960-07-01), Jones
patent: 3526007 (1970-09-01), Ivko et al.
patent: 3833942 (1974-09-01), Collins
patent: 5007937 (1991-04-01), Fishman et al.
patent: 5139526 (1992-08-01), Skardoutos et al.
Otto Bock Orthopaedische Industrie Besitz- und Verwaltungs-Komma
Willse David H.
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