CZ25369U1 - Manually adjustable prosthesis of upper extremity finger - Google Patents

Description

Technical field

The technical solution relates to a manually adjustable upper limb finger prosthesis formed by a base which is integrated in the palm part of the prosthesis and on which the finger points are pivotally interconnected.

Background Art

Hand prostheses, if they are essentially natural in shape, can be divided into mechanically adjustable and myoelectric. Myoelectric prosthesis is a multi-engine-powered artificial hand, powered by internal batteries placed in the prosthesis. It provides a simple grip or even rotation of the wrist. The higher degree of myoelectric prosthesis is the bionic prosthesis controlled by the patient's nervous system. This allows the patient to control each finger separately and thus feels like a healthy hand. The disadvantage of myoelectric prostheses is their enormous acquisition cost. Therefore, prostheses are widespread in which the opening of the fingers is adjusted mechanically by the other, healthy hand.

A prosthesis of this type is known, for example, from CA 2459686. Through them, a flexible wire connects them, allowing them to vary the angular position of the links. The disadvantage of this arrangement is that the finger, whether in any position, is not stiff enough to hold objects. EP 1522286 discloses a finger prosthesis formed by a rod rotatably mounted in a base integrated in the palm of the prosthesis. Its locking mechanism is that the rod is provided with a ratchet in place of the joint, into which the latch engages resiliently mounted in the base. This allows to a certain extent to adjust the position of the finger, but such a prosthesis provides the user with minimal comfort.

It is an object of the present invention to provide a manually adjustable finger prosthesis which substantially reduces the disadvantages of known prostheses.

The essence of the technical solution

This object is solved by a manually adjustable upper limb prosthesis formed by a base which is integrated in the palm of the prosthesis and on which the finger links interconnected rotatably about the pivot axes are rotatably mounted around the pivot axes. The essence of the prosthesis is that the pivot axis interconnecting the base with the first link and the pivot axes interconnecting the links are located on the dorsal side, with the base with the first link and the adjacent links being interconnected by links pivotally mounted in the links and base and forming together with the links a pantograph structure, wherein the link connecting the base to the first link is pivotally coupled to the locking member, which is slidably mounted in the base, pushed in a distal spring direction and provided along a length of a plurality of cogs engaging the spring latch.

In a preferred embodiment, the arresting member has a cylindrical barrel shape on the underside, whereby a strut connecting the latch with the spring button extends through its longitudinal vertical cutout.

In another embodiment, the locking member may have a claw on the upper side, wherein the latch is part of a spring-loaded cradle mounted on the top of the base.

If the teeth are formed in the shape of a ratchet tooth and the ratchet tooth in a corresponding shape, it is not necessary to release the ratchet when forming the finger.

Explanation of the drawings in the drawing

The technical solution will be further elucidated by means of a drawing in which Fig. 1 to 5 shows an example of a manually adjustable finger prosthesis. FIG. 1 is a front view, FIG. 2 is a partial side view

Fig. 3 is a sectional view of C-C of Fig. 1, Fig. 4 is a detail of F of Fig. 2, and Fig. 5 is a detail of G of Fig. 3.

Examples of technical solutions

The upper limb finger prosthesis is formed by the base 1 which is integrated in the palm of the hand. Finger links 2, 3, 4 are connected to each other at the base 1 and are connected to each other by pivot axes 5.

The pivot axis 5 interconnecting the base 1 with the first link 2 and the axes 5 connecting the links 2, 3, 4 to each other on the back side. In addition, the base is connected to the first cell 2 and the adjacent cells 2, 3, 4 are in addition connected to each other by rods 6, 7, 8 rotatably mounted in the cells 2, 3, 4 and together with the cells 2, 3, 4 form a pantograph. The rod 6 connecting the base 1 to the first member 2 is pivotally connected to the locking member 9, which is slidably mounted in the base I and pushed in the distal direction by the spring 10. The locking member 9 is provided along a series of teeth 11 into which the spring-loaded pawl 12 fits .

1 to 5, the locking member 9 has a cylindrical shape with a claw H on the underside. Its longitudinal vertical cut-out extends a strut 13 connecting the latch 12 to the spring-loaded button

14. The screw 15 serves to limit the path of the locking member 9.

In another embodiment, the locking member 9 may have a claw H on the upper side. In such a case, the latch 12 would be part of the spring cradle mounted on the top of the base 1.

In other embodiments, the teeth 11 may have the shape of a ratchet tooth and the tooth of the ratchet 12 will have the corresponding shape. Then, when closing the toes of the finger, the latch 12 slides over the claws 11 and it is not necessary to release the latch, while this construction also prevents spontaneous opening.

1 to 5, each time the finger shape is changed, the button 14 must be depressed.

If the button 14 is pressed and no finger is placed on the finger, the spring 10 straightens the finger over the locking member of the roller 9 and the rods 6, 7, 8.

Claims (4)

25 PROTECTION REQUIREMENTS Manually adjustable leg prosthesis consisting of a base (1) which is integrated in the palm of the prosthesis and on which the finger members (2, 3, 4) are rotatably connected to each other, characterized in that the axis of rotation (5) connecting the base (1) to the first link (2) and the pivot axes (5) connecting the links (2, 3, 4) to each other are on the back30, the base (1) with the first link (2) and adjacent links (2) 3, 4) are further connected to each other by rods (6, 7, 8) rotatably mounted in the links (2, 3, 4) and the base (1) and form a pantograph structure together with the links (2, 3, 4), (6) connecting the base (1) to the first link (2) is pivotally connected to a locking member (9) which is slidably mounted in the base (1), pushed in the distal direction by a spring (10) and provided with a series of cogs (11) ), do 3 5 which engages the spring catch (12). Prosthesis according to claim 1, characterized in that the locking member (9) has the shape of a cylinder with cogs (11) on the underside and a longitudinal vertical cut-out extends through a strut (13) connecting the latch (12) to the spring-loaded button (14). Prosthesis according to claim 1, characterized in that the locking member (9) has teeth (11) 40 on the upper side, the latch (12) being part of a cradle mounted on the upper side of the base (1). -2EN 25369 Ul Prosthesis according to claims 1 to 3, characterized in that the teeth (11) are in the form of ratchet teeth and the ratchet teeth (12) in corresponding shape.