Three-point memory alloy near-articular-surface fracture fixator

Abstract

The utility model relates to a three-point memory alloy near-articular-surface fracture fixator, which belongs to the technical field of medical instruments and comprises an arc-shaped nail back, a first cylindrical screw and a nail corner are respectively arranged at two ends of the arc-shaped nail back, and a second cylindrical screw is arranged at the other end of the arc-shaped nail back. The first cylindrical screw and the second cylindrical screw are both bent downwards from the ends of the arc-shaped screw backs, the diameter of the first cylindrical screw is larger than that of the second cylindrical screw, diagonal planes are arranged at the bottom of the first cylindrical screw and the bottom of the second cylindrical screw, and the diagonal planes are the tips of the lower portions of the first cylindrical screw and the second cylindrical screw and only need to be inclined downwards. During use, two-point fixation is changed into three-point fixation, and the triangular cylindrical screws further increase stability after fracture fixation and avoid movement of the fracture after fixation.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to a three-point memory alloy proximal articular surface fracture fixator. Background Art

[0002] Metacarpal fractures are common hand fractures, often caused by direct force. They are categorized as metacarpal head fractures, metacarpal neck fractures, metacarpal shaft fractures, and metacarpal base fractures. Symptoms include swelling, pain, and limited movement in the injured hand. These conditions can limit hand movement, impact functional abilities, and cause inconvenience.

[0003] With the improvement of medical level and the improvement of patients' requirements for hand function, metacarpal fracture open reduction and plate cylindrical screw internal fixation technology has been widely used in the treatment of metacarpal fractures. Referring to a memory alloy nail foot fixator with the announcement number CN209074737U, the disadvantage of this patent during use is that it is only fixed at two points, and the two points cannot provide sufficient stability. The fracture end can still move after the fracture is fixed. In addition, when drilling and inserting the device into the fracture end hole, a special tool is required to be inserted, but it cannot be completely inserted, that is, the device cannot be placed in the final position to fit the bone surface at one time by this tool. The tool needs to be removed and the device needs to be knocked to fit the bone surface. This conversion process will lead to the loss of fracture reduction or reduced fixation strength, resulting in surgical failure. Utility Model Content

[0004] The purpose of the present invention is to provide a three-point shape memory alloy proximal articular surface fracture fixator with a simple structure and reasonable design in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A three-point memory alloy proximal articular surface fracture fixator includes an arcuate nail back, with a first cylindrical screw and a nail corner respectively provided at both ends of the arcuate nail back, the nail corner including two second cylindrical screws, the two second cylindrical screws are arranged obliquely and form an angle between them, the first cylindrical screw and the second cylindrical screw are both provided with fixing serrations on the side close to each other, and the first cylindrical screw and the second cylindrical screw are both bent downward from the end of the arcuate nail back.

[0007] As a further optimization solution of the present invention, multiple grooves are provided on the outer surfaces of both sides of the arc-shaped nail back.

[0008] As a further optimization solution of the present invention, a plurality of arc-shaped notches are provided on the lower surface of the arc-shaped nail back.

[0009] As a further optimization solution of the present invention, the bottoms of the first cylindrical screw and the second cylindrical screw are both provided with beveled surfaces.

[0010] As a further optimization solution of the present invention, the angle between the two second cylindrical screws is 30 degrees.

[0011] As a further optimization solution of the present invention, the width of the fixing serrations on the first cylindrical screw does not exceed the widest part of the second cylindrical screw.

[0012] The beneficial effects of the present invention are as follows: the present invention has the following advantages during use:

[0013] Advantages 1. Change from two-point fixation to three-point fixation, triangular cylindrical screws further increase the stability of the fracture after fixation and avoid the movement of the fracture after fixation;

[0014] Advantage 2: The existence of the groove avoids the possibility of loss of reset caused by the existing solution that requires the special tool to be removed and then knocked in. The special tool fits and clamps the groove tightly, which can not only place the device but also be directly knocked in by the tool;

[0015] Advantage 3: The presence of the notch allows for limited contact between the device and the bone surface, providing fracture stability while minimizing pressure on bone blood flow;

[0016] Advantage 4: The existence of the top angle makes it narrower and thinner, avoiding excessive stripping and compression of the metacarpal head or the ligament attached to the base, which is beneficial to fracture healing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front structural schematic diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the top view of the structure of the utility model;

[0019] Figure 3 It is a side structural schematic diagram of the utility model.

[0020] In the figure: 1. Arc-shaped nail back; 2. First cylindrical screw; 3. Nail corner; 4. Second cylindrical screw; 5. Groove; 6. Notch; 7. Fixing serration; 8. Beveled surface. DETAILED DESCRIPTION

[0021] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] like Figure 1-Figure 3 As shown, a three-point memory alloy proximal articular surface fracture fixator includes an arc-shaped nail back 1, and a first cylindrical screw 2 and a nail angle 3 are respectively provided at both ends of the arc-shaped nail back 1. The diameter of the first cylindrical screw 2 is larger than that of the second cylindrical screw 4. The bottoms of the first cylindrical screw 2 and the second cylindrical screw 4 are both provided with a beveled surface 8. The beveled surface 8 is the tip below the first cylindrical screw 2 and the second cylindrical screw 4. It can be tilted down to facilitate the insertion of the first cylindrical screw 2 and the second cylindrical screw 4. The nail angle 3 includes two second cylindrical screws 4. The two second cylindrical screws 4 are tilted and form an angle between each other. The angle between the two second cylindrical screws 4 is 30 degrees. The first cylindrical screw 2 and the second cylindrical screw 4 are both provided with fixing serrations 7 on the side close to each other. The first cylindrical screw 2 and the second cylindrical screw 4 are both bent downward by the end of the arc-shaped nail back 1. The width of the fixing serrations 7 on the first cylindrical screw 2 does not exceed the widest part of the second cylindrical screw 4. The outer surfaces of both sides of the arc-shaped nail back 1 are provided with multiple grooves 5. When in use, special tools can be matched with the grooves 5. After clamping the entire part of the screw, it can be directly knocked into the nail hole until it fits the bone surface. The lower surface of the arc-shaped nail back 1 is provided with multiple arc-shaped notches 6. The notches 6 can make the entire device have limited contact with the bone surface, thereby minimizing the pressure of the device on the bone blood supply.

[0023] It should be noted that this three-point memory alloy near-articular surface fracture fixator, during surgery, the fixator is placed in sterile ice saline to allow it to cool sufficiently, and then a special tool is used to parallelize the first cylindrical screw 2 and the two second cylindrical screws 4 in the ice saline, an incision is made at the ligament rupture, the near-articular surface fracture is reduced, and a metal bone needle is temporarily used to fix it. A special tool is used to drill three holes at both ends of the fracture, and the ends of the shaped fixator are inserted into the holes. After being fixed and clamped with a special tool, it is driven into the bone surface to fit. After installation, a gauze soaked in sterile hot saline is used to heat the device to restore the bending of the first cylindrical screw 2 and the two second cylindrical screws 4. The three-point fixation ensures that the fracture ends are stably fixed. When the device needs to be removed, an incision is first made, the tissue is peeled off to expose the device, the device is cold-compressed with gauze soaked in sterile ice saline, and then it is easily removed by fitting and clamping with a special tool.

[0024] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A three-point memory alloy proximal articular surface fracture fixator, comprising an arc-shaped nail back (1), characterized in that: The two ends of the arc-shaped nail back (1) are respectively provided with a first cylindrical screw (2) and a nail corner (3); the nail corner (3) includes two second cylindrical screws (4); the two second cylindrical screws (4) are arranged obliquely and form an angle between each other; the first cylindrical screw (2) and the second cylindrical screw (4) are both provided with fixing serrations (7) on the side close to each other; the first cylindrical screw (2) and the second cylindrical screw (4) are both bent downward from the end of the arc-shaped nail back (1).

2. The three-point shape memory alloy proximal articular surface fracture fixator according to claim 1, characterized in that: Multiple grooves (5) are provided on the outer surfaces of both sides of the arc-shaped nail back (1).

3. The three-point shape memory alloy proximal articular surface fracture fixator according to claim 1, characterized in that: The lower surface of the arc-shaped nail back (1) is provided with a plurality of arc-shaped notches (6).

4. The three-point shape memory alloy proximal articular surface fracture fixator according to claim 1, characterized in that: The bottoms of the first cylindrical screw (2) and the second cylindrical screw (4) are both provided with beveled surfaces (8).

5. The three-point shape memory alloy proximal articular surface fracture fixator according to claim 1, characterized in that: The angle between the two second cylindrical screws (4) is 30 degrees.

6. The three-point shape memory alloy proximal articular surface fracture fixator according to claim 1, characterized in that: The width of the fixing serrations (7) on the first cylindrical screw (2) does not exceed the widest part of the second cylindrical screw (4).

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