Education and demonstration – Anatomy – physiology – therapeutic treatment – or surgery... – Anatomical representation
Patent
1982-08-04
1984-08-21
Grieb, William H.
Education and demonstration
Anatomy, physiology, therapeutic treatment, or surgery...
Anatomical representation
3 127, G09B 2332, A61F 106
Patent
active
044668007
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a finger model with joints corresponding to the finger in question, connected with each other and having tendon-like cords attached to its joints for the purpose of moving them.
A finger model of this kind has been described, for instance, in the Journal of Bone and Joint Surgery, Vol. 44B, No. 4, November, 1962, 899-909. With this finger model the natural finger movements can only be partially reproduced.
It is the purpose of the invention to provide a finger model of the initially described type, by means of which the natural motions of a finger can be performed and which is suitable for use as endoprosthesis. According to a subsequent development of the invention, it should be possible to demonstrate injuries to the mechanism of finger motions.
The above problem is solved by a finger model of the initially described kind which, according to the invention, is characterized by channel-like guides being provided at the central and/or the proximal phalange and/or the metacarpale at the underside and close to the edges of the articular facets to accept inserted cords. This particular finger model is suited for use as finger-endoprosthesis as well as a demonstration object.
In the following, the invention is described by means of preferred embodiments and taking reference to the drawings.
The drawings are as follows:
FIG. 1 a top view of a preferred embodiment of a finger model from below;
FIG. 2 a lateral view of a somewhat modified finger model;
FIG. 3 a top view of the finger model from above;
FIG. 4 a detail of FIG. 1;
FIG. 5 a detail of FIG. 2; and
FIG. 6 a top view of a finger model attached to a demonstration board.
The finger model of the drawings shows, in each case, a median digit consisting of distal phalange 2, central phalange 3, proximal phalange 4 and metacarpale 5. These joints 2, 3, 4, and 5 in the preferred embodiment shown in FIG. 1 are connected by articulations 6, 7, 8 which are known. FIG. 4 is the detailed drawing of the element shown in FIG. 1. It comprises the articular disc 9 itself, located between the opposing articular facets, having double T-shaped transverse walls 10, 11 at the lateral edges of the model. In approximately the center of the articular disc and vertical thereto, pin-shaped projections 12, 13 are provided towards both sides which mate with cylindrical bores (not shown) of the joints to be connected with each other. The joints are preferably made of an elastic synthetic material, of the type which is commercially available, e.g. by the name of SILASTIC. A joint connection of this kind permits movements vertical to the plane of the hand and they are protected against lateral motion.
In the embodiment shown in FIGS. 2 and 3, the articulated connection between two neighboring joints is effected by an articular mechanism 4. The said mechanism has two rings 15, 16, made of strong wire which are taken through a bore 17 forming the rotational axis of the joint, being located at the joint facing the wrist. At the respective adjoining joint to be connected therewith, the rings are preferably taken through two bores 18, 19, being at a distance from each other, as shown in FIG. 2. In this manner, the joints are able to perform articulated motions at a distance from each other, without direct contact of the articular facets and without the insertion of an intermediate articulation.
As can best be seen in FIG. 1, a cord 20, corresponding to the musculus-flexoprofundus tendon is journaled to the underside of the distal phalange 2 at a distance from the rim of the articular facet of the distal phalange. The distance of the fastening point 21 from the rim 22 of the articular facet is about one third of the length of the distal phalange 2. A cord 24, corresponding to the superficialis tendon, is attached to the underside of the central phalange 3 again at a distance of about one third of the total length of the central phalange from the rim 23 of the articular facet lying opposite from the proximal phalange. In the embodiment as shown in FIG. 1, this cord is
REFERENCES:
patent: 1501308 (1924-07-01), Burney
patent: 2641769 (1953-06-01), Robinson
patent: 2859450 (1958-11-01), Becker
patent: 3188753 (1965-06-01), Lovercheck
patent: 4332570 (1982-06-01), Getty
The Journal of Bone and Joint Surgery, vol. 44B, No. 4, Nov. 1962, "Muscle Function in the Fingers," pp. 899-909.
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