Adjustable dynamic finger joint traction external fixator

Abstract

The invention discloses an adjustable dynamic finger joint traction external fixator which comprises at least two fixing steel needles used for penetrating through the two sides of a fracture position, the two side ends of the two fixing steel needles are elastically pre-tightened through adjustable elastic mechanisms, and each adjustable elastic mechanism comprises a connecting mechanism at the two ends, an elastic piece and an adjusting mechanism. And the adjusting mechanism is used for adjusting and locking the pre-tightening force on the elastic piece. The fixator is provided with the adjustable elastic mechanism, elastic pre-tightening force can be adjusted and locked, then elastic tensioning force with adjustable force can be applied to the two sides of a phalanx crack, the pre-tightening force can be adjusted according to changes of conditions, and healing of injured bones is facilitated.

Description

Technical Field

[0001] The invention relates to a fixing device for finger joint injuries, in particular to an adjustable dynamic finger joint traction external fixator. Background Art

[0002] Currently, traditional external fixation methods for finger joint injuries (such as fractures, dislocations, joint contractures, etc.) often use plaster, splints or static external fixators. However, the above fixation methods have many shortcomings, especially those that are not conducive to early exercise, as follows: 1. Complete fixation, which is not conducive to early activities: Traditional static fixation restricts joint movement, and long-term fixation can easily lead to joint stiffness, muscle atrophy, and loss of function; 2. Unadjustable traction force: Traditional methods are difficult to provide continuous and controllable joint traction, which is not conducive to joint reduction and soft tissue repair; 3. Large size, which affects function: Traditional external fixators are large and bulky, affecting finger flexibility and daily life; 4. Poor comfort: They are uncomfortable to wear for a long time, and patient compliance is poor. Summary of the Invention

[0003] In view of the shortcomings of the background technology, the technical problem to be solved by the present invention is to provide an adjustable dynamic finger joint traction external fixator, which is lighter, has dynamically adjustable elastic preload, and allows early and controllable joint movement.

[0004] To this end, the present invention is achieved by adopting the following technical solutions:

[0005] An adjustable dynamic finger joint traction external fixator is characterized by comprising at least two fixing steel needles for passing through both sides of a fracture site, both side ends of the two fixing steel needles being elastically pre-tightened by an adjustable elastic mechanism, the adjustable elastic mechanism comprising a connecting mechanism at both ends, an elastic member and an adjusting mechanism, and the adjusting mechanism adjusting and locking the pre-tightening force on the elastic member.

[0006] Preferably, a hanging ring is formed at one end of the elastic member, and the hanging ring constitutes the connecting mechanism. The adjusting mechanism includes a screw fixed to the other end of the elastic member, the screw passes through the bracket fixed to the steel needle and is threadedly connected to the adjusting nut, and a locking nut is threadedly connected to the outer end of the screw and the adjusting nut, and the side end of the locking nut facing the adjusting nut is a rough surface, and the adjusting nut is rotated to adjust the pre-tightening force on the elastic member. After the adjusting nut is adjusted into place, the locking nut is screwed into a position against the adjusting nut to achieve locking.

[0007] Preferably, the elastic member is rotatably connected to the screw.

[0008] Preferably, the elastic member is a spring or an elastic rubber band.

[0009] Preferably, a hanging ring is formed at one end of the elastic member, and the hanging ring constitutes the connecting mechanism. The adjusting mechanism includes a screw fixed to the other end of the elastic member, and the elastic member and the screw are rotatably connected. The screw passes through a threaded hole on a bracket fixed to the steel needle and forms a threaded connection. The outer end of the screw is threadedly connected to a locking nut, and the locking nut has a rough surface facing the side end of the bracket. The screw is rotated to adjust the pre-tightening force on the elastic member. After the screw is adjusted into place, the locking nut is screwed into a position against the bracket to achieve locking.

[0010] Preferably, the fixer includes a finger cover, the outer surface of the finger cover has an external thread, a nut cover is threadedly connected to the finger cover, the rear end of the nut cover is rotatably connected to a connecting ring, at least two of the elastic parts are symmetrically connected to the connecting ring, the other end of the elastic part is connected to the two ends of the fixed steel needle on the rear side, and the nut cover moves back and forth along the thread on the finger cover during rotation to adjust the preload force of the elastic part.

[0011] After adopting the above technical solution, the beneficial effects are as follows:

[0012] 1. The fixator is equipped with an adjustable elastic mechanism, and its elastic preload force is dynamically adjustable, thereby achieving elastic tension with adjustable strength on both sides of the phalanx fissure, which is beneficial to the healing of the injured bone.

[0013] 2. The fixator of the present invention is more lightweight and allows early and controllable joint movement, which is beneficial to promoting the recovery of joint function. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention has the following accompanying drawings:

[0015] Figure 1 This is a schematic structural diagram of the fixator provided in the first embodiment of the present invention being installed on a finger.

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the adjustable dynamic finger joint traction external fixator.

[0017] Figure 3 for Figure 2 A local enlarged schematic diagram of point A.

[0018] Figure 4 This is a schematic structural diagram of an adjustable dynamic finger joint traction external fixator provided in Example 2 of the present invention.

[0019] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B.

[0020] Figure 6 This is a structural schematic diagram of the fixator provided in the third embodiment of the present invention being installed on a finger. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0022] Reference Figure 1-3 As shown, the adjustable dynamic finger joint traction external fixator provided in the first embodiment of the present invention includes at least two fixing steel needles 1 for passing through both sides of the fracture. Both side ends of the two fixing steel needles 1 are elastically pre-tightened by an adjustable elastic mechanism. The adjustable elastic mechanism includes a connecting mechanism at both ends, an elastic member 2 and an adjustment mechanism. The adjustment mechanism adjusts and locks the pre-tightening force on the elastic member.

[0023] One end of the elastic member 2 forms a hooking ring 3, which constitutes the connecting mechanism. The adjusting mechanism includes a screw 4 fixed to the other end of the elastic member 2. The screw 4 passes through a bracket 5 fixed to the steel needle 1 and is threadedly connected to an adjusting nut 6. A locking nut 7 is threadedly connected to the outer end of the screw 4 and the adjusting nut 6. The side end of the locking nut 7 facing the adjusting nut 6 is rough. The adjusting nut 6 is rotated to adjust the preload force on the elastic member 2. After the adjusting nut 6 is adjusted into place, the locking nut 7 is screwed into a position against the adjusting nut 6 to achieve locking. The elastic member 2 is rotatably connected to the screw 4. The elastic member 2 can be a spring or an elastic rubber band.

[0024] The adjustable dynamic finger joint traction external fixator of the first embodiment is operated as follows: first, loosen the locking nut 7 backward; second, turn the adjusting nut 6 to adjust it to a suitable position; finally, re-tighten the locking nut 7 onto the end face of the adjusting nut 6.

[0025] Reference Figure 4-5 As shown, the second embodiment of the present invention is basically the same as the first embodiment, and the only difference is that: in the second embodiment: the adjustment mechanism includes a screw 4 fixed to the other end of the elastic member, the elastic member 2 and the screw 4 are rotatably connected, the screw 4 passes through the threaded hole 8 on the bracket fixed to the steel needle and forms a threaded connection, the outer end of the screw 4 is threadedly connected to a locking nut 7, and the side end of the locking nut 7 facing the bracket 5 is rough. The screw 4 is rotated to adjust the preload force on the elastic member 2. After the screw 4 is adjusted into place, the locking nut 7 is screwed into the position against the bracket 5 to achieve locking. In the second embodiment, the screw 4 is threadedly connected to the threaded hole 8 on the bracket 5, which is conducive to directly locking the position after adjusting the screw 4. Compared with the first embodiment, it is locked at the front and back. If combined with the locking nut 7, its locking effect is more prominent. The adjustment of this embodiment is relatively simple. You only need to unscrew the locking nut 7, then turn the screw 4 to adjust it to the appropriate position, and then re-tighten the locking nut 7.

[0026] Reference Figure 6 As shown, the third embodiment of the present invention is basically the same as the first embodiment, and the only difference is that in the third embodiment: the fixator includes a finger cover 9, the outer surface of the finger cover 9 has an external thread, a nut cover 10 is threadedly connected to the finger cover 9, the rear end of the nut cover 10 is rotatably connected to a connecting ring 11, at least two elastic members 2 are symmetrically connected to the connecting ring 11, the other end of the elastic member 2 is connected to the two ends of the fixed steel needle 1 on the rear side, and the nut cover 10 moves forward and backward along the thread trend on the finger cover 9 during rotation to adjust the preload force of the elastic member 2. The structure of the finger cover 9 fully utilizes the characteristic that the finger is small in front and large in the back. The finger cover 9 has backward resistance after being sleeved on the finger, which can reduce the application of the fixed steel needle 1.

Claims

1. An adjustable dynamic finger joint traction external fixator, characterized by: It includes at least two fixing steel needles for passing through both sides of the fracture. Both side ends of the two fixing steel needles are elastically pre-tightened by an adjustable elastic mechanism. The adjustable elastic mechanism includes a connecting mechanism at both ends, an elastic part and an adjusting mechanism. The adjusting mechanism adjusts and locks the pre-tightening force on the elastic part.

2. The adjustable dynamic finger joint traction external fixator according to claim 1, characterized in that: A hanging ring is formed at one end of the elastic member, and the hanging ring constitutes the connecting mechanism. The adjusting mechanism includes a screw fixed to the other end of the elastic member, the screw passes through the bracket fixed to the steel needle and is threadedly connected to the adjusting nut, and a locking nut is threadedly connected to the outer end of the screw and the adjusting nut. The side end of the locking nut facing the adjusting nut is a rough surface, and the adjusting nut is rotated to adjust the pre-tightening force on the elastic member. After the adjusting nut is adjusted into place, the locking nut is screwed into a position against the adjusting nut to achieve locking.

3. The adjustable dynamic finger joint traction external fixator according to claim 2, characterized in that: The elastic member is rotatably connected to the screw rod.

4. The adjustable dynamic finger joint traction external fixator according to claim 1, 2 or 3, characterized in that: The elastic member is a spring or an elastic rubber band.

5. The adjustable dynamic finger joint traction external fixator according to claim 1, characterized in that: One end of the elastic member forms a hanging ring, and the hanging ring constitutes the connecting mechanism. The adjusting mechanism includes a screw fixed to the other end of the elastic member. The elastic member and the screw are rotatably connected. The screw passes through a threaded hole on a bracket fixed to the steel needle and forms a threaded connection. The outer end of the screw is threadedly connected to a locking nut, and the locking nut has a rough surface facing the side end of the bracket. The screw is rotated to adjust the pre-tightening force on the elastic member. After the screw is adjusted into place, the locking nut is screwed into a position against the bracket to achieve locking.

6. The adjustable dynamic finger joint traction external fixator according to claim 1, characterized in that: The fixer includes a finger cover, the outer surface of the finger cover has an external thread, a nut cover is threadedly connected to the finger cover, the rear end of the nut cover is rotatably connected to a connecting ring, at least two elastic parts are symmetrically connected to the connecting ring, the other end of the elastic part is connected to the two ends of the fixed steel needle on the rear side, and the nut cover moves back and forth along the thread on the finger cover during rotation to adjust the preload force of the elastic part.

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