Bone hammer-shaped finger dead center fixing device

Abstract

The invention discloses a bone hammer-shaped finger dead point fixing device, and relates to the technical field of medical instruments. A fixing plate of the dead point fixing device comprises a fixing plate body and a blocking hook protruding towards the side away from the fixing plate body, the fixing plate body is provided with a plurality of screw holes, the blocking hook is of an arc-shaped structure with a preset angle and is used for fixing an avulsion bone block, and a first fixing claw is located on the side, close to the avulsion bone block, of the fixing plate body. The end of the first fixing claw abuts against an avulsion bone block, the second fixing claw is located on the side, close to the extensor tendon and away from the first fixing claw, of the fixing plate body, and the lag screw is arranged to be screwed into the middle phalanx through the screw hole, so that the fixing plate is driven to move towards the tail phalanx when the lag screw is screwed in. The first fixing claw is driven to push the avulsion bone block to move towards the tail end phalanx. The dead point fixing device is used for stably pressurizing and fixing an avulsed bone block and carrying out anti-stretching fixing on an extensor tendon, and rapid healing and functional recovery of a bone tendon dead point are achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a bony hammer-shaped finger fixation device. Background Technology

[0002] Bony mallet finger is a common type of hand injury, characterized by avulsion fracture of the extensor tendon insertion. Due to the small size and superficial location of the bone fragment on the dorsal side of the distal phalanx base, traditional treatment methods mainly employ Kirschner wire blocking (Ishiguro method) or direct Kirschner wire fixation for reduction and fixation.

[0003] However, when using the Ishiguro Kirschner wire for bony obstruction to force fracture fragment reduction, the fragments often shift during fixation due to extensor tendon traction, leading to treatment failure. Furthermore, current techniques using a single Kirschner wire can result in insecure obstruction, with proximal tendon traction easily causing slippage. Additionally, the skin on the dorsal side of the distal phalanx is thin, making the Kirschner wire tail prone to irritation, leading to skin infection and necrosis. Moreover, the obstructing Kirschner wire must be inserted from the tendon insertion point into the dorsal side of the middle phalanx, causing secondary damage to the extensor tendon insertion point. Summary of the Invention

[0004] One objective of this invention is to provide an insertion point fixation device for bony mallet fingers, which solves the technical problem that secondary damage to the extensor tendon insertion point is easily caused during the treatment of bony mallet fingers in the prior art.

[0005] Another objective of this invention is to further improve the repositioning accuracy of the fixation device for avulsed bone fragments in bony hammer fingers.

[0006] According to the purpose of this invention, a bony hammer-shaped finger fixation device is provided, comprising: The fixation plate includes a fixation plate body and a blocking hook protruding toward the side away from the fixation plate body. The fixation plate body has multiple screw holes, and the blocking hook is an arc-shaped structure at a preset angle for fixing the avulsed bone fragment. At least one first fixing claw is located on the side of the fixing plate body near the avulsed bone block, and the first fixing claw is configured to abut against the avulsed bone block at its end; At least one second fixing claw is located on the side of the fixing plate body that is close to the extensor tendon and away from the first fixing claw, and the height of the second fixing claw is any value between 0.8mm and 1.0mm; Multiple tension screws are provided corresponding to each screw hole. The tension screws are configured to be screwed into the middle phalanx through the screw holes, so that when the tension screws are screwed in, they drive the fixing plate to move toward the distal phalanx, thereby driving the first fixing claw to push the avulsed bone piece toward the distal phalanx.

[0007] Optionally, the preset angle is any value between 20° and 50°.

[0008] Optionally, the blocking hook includes a first end away from the fixing plate body, the first end being spaced apart from the end of the first fixing claw by any value between 3mm and 5mm.

[0009] Optionally, there may be multiple first fixing claws, which are arranged at intervals along the extension direction of the avulsed bone block, and the distance between two adjacent first fixing claws is any value between 1mm and 2mm.

[0010] Optionally, there are two second fixing claws, which are distributed at intervals at both ends of the fixing plate body along the width direction of the extensor tendon.

[0011] Optionally, the width of the first fixing claw is any value between 1.0mm and 1.5mm, and the height is any value between 0.5mm and 0.8mm.

[0012] Optionally, the width of the second fixing claw is any value between 1.5mm and 2.5mm.

[0013] Optionally, the thickness of the fixing plate is any value between 1.2mm and 2.0mm.

[0014] Optionally, the diameter of the tension screw is any value between 1.8mm and 2.0mm.

[0015] In the fixation device of this invention, the blocking hook of the fixation plate, combined with the first fixing claw, is used to fix the avulsed bone fragment, so that the avulsed bone fragment is actively pushed and adhered during repositioning, improving the fixation firmness. The second fixing claw is set between the extensor tendon and the fixation plate body to prevent the extensor tendon from slipping and to support and isolate the fixation plate body, preventing the fixation plate body from adhering to the extensor tendon. Through the cooperation of the arc-shaped blocking hook, the first fixing claw, the second fixing claw, and the tension screw, stable pressure fixation of the avulsed bone fragment and anti-tension fixation of the extensor tendon are achieved. The whole device forms a multi-point triangular support structure with high stability. The dorsal side of the fixation device is flat, which does not irritate the skin and reduces the risk of infection. Ultimately, it achieves rapid healing and functional recovery of the bone tendon insertion point, reduces damage to the extensor tendon, and fixes the extensor tendon to prevent proximal traction.

[0016] Furthermore, by arranging multiple first fixation claws at intervals of 1mm-2mm along the extension direction of the avulsed bone block, the present invention creates continuous and uniform support points along the length of the avulsed bone block, thereby increasing the contact area between the fixing device and the avulsed bone block, improving the uniformity and stability of the force on the avulsed bone block. The 1mm-2mm spacing between the two claws avoids local tissue compression or interference caused by excessively dense first fixation claws, and also avoids the problems of discontinuous support and insecure fixation caused by excessively sparse first fixation claws. This allows the avulsed bone block to obtain more reliable linear support and anti-rollover ability during the repositioning and fixation process, ultimately improving the repositioning accuracy of the avulsed bone block and the quality of postoperative healing.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic front view of a stop-point fixing device according to an embodiment of the present invention; Figure 2 This is a schematic side view of a stop-point fixing device according to an embodiment of the present invention; Figure 3 This is a schematic installation diagram of a stop-point fixing device according to an embodiment of the present invention for avulsing bone fragments; Figure 4 yes Figure 3 A schematic enlarged view of a portion at point A shown; Figure 5 This is a schematic installation diagram of a stop-point fixing device according to an embodiment of the present invention for tearing off bone fragments at another angle.

[0019] Figure label: 100-Stop fixation device, 10-Fixed plate, 11-Fixed plate body, 12-Blocking hook, 111-Screw hole, 200-Torn bone fragment, 20-First fixation claw, 30-Second fixation claw, 300-Extensor tendon, 40-Tension screw, 400-Intermediate phalanx, 500-Temperature phalanx. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0022] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] Figure 1 This is a schematic front view of a stop-point fixing device according to an embodiment of the present invention. Figure 2 This is a schematic side view of a stop-point fixing device according to an embodiment of the present invention. Figure 3 This is a schematic installation diagram of a stop-point fixing device according to an embodiment of the present invention for use in avulsing bone fragments. Figure 4 yes Figure 3 A schematic enlarged view of point A shown. Figure 5 This is a schematic installation diagram of a stop-point fixing device according to an embodiment of the present invention for tearing off bone fragments at another angle.

[0025] like Figure 1 and Figure 2 As shown, the present invention provides a bony hammer-shaped finger fixation device 100, the fixation device 100 including a fixation plate 10, at least one first fixation claw 20, at least one second fixation claw 30, and a plurality of tension screws 40 corresponding to each screw hole 111 (see reference). Figure 3The fixation plate 10 includes a fixation plate body 11 and a blocking hook 12 protruding toward the side away from the fixation plate body 11. The fixation plate body 11 has multiple screw holes 111, and the blocking hook 12 is an arc-shaped structure at a preset angle for fixing the avulsed bone fragment 200 (see reference). Figure 3 The first fixing claw 20 is located on the side of the fixing plate body 11 near the avulsed bone fragment 200, and the end of the first fixing claw 20 is configured to abut against the avulsed bone fragment 200. The second fixing claw 30 is located on the fixing plate body 11 near the extensor tendon 300 (see reference). Figure 3 And away from the side of the first fixing claw 20, and the height of the second fixing claw 30 is any value between 0.8mm and 1.0mm, the tension screw 40 is set to be screwed into the middle phalanx 400 through the screw hole 111 (refer to...). Figure 3 This causes the retaining plate 10 to move toward the distal phalanx 500 when the tension screw 40 is screwed in (see reference). Figure 3 The first fixing claw 20 moves to drive the avulsed bone fragment 200 toward the distal phalanx 500. Here, the number of first fixing claws 20 can be one, two, or more, the number of second fixing claws 30 can be one, two, or more, the height of the second fixing claws 30 can be 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1.0mm, or any other value between 0.8mm and 1.0mm, and the fixing plate 10 is made of titanium alloy.

[0026] In this embodiment, the blocking hook 12 of the fixing plate 10 in the insertion fixation device 100, combined with the first fixing claw 20, is used to fix the avulsed bone fragment 200, so that the avulsed bone fragment 200 is actively pushed and adhered during repositioning, improving the fixation firmness. The second fixing claw 30 is set between the extensor tendon 300 and the fixing plate body 11 to prevent the extensor tendon 300 from slipping and to support and isolate the fixing plate body 11, preventing the fixing plate body 11 from adhering to the extensor tendon 300. Through the cooperation of the arc-shaped blocking hook 12, the first fixing claw 20, the second fixing claw 30 and the tension screw 40, stable pressure fixation of the avulsed bone fragment 200 and anti-tension fixation of the extensor tendon 300 are achieved. The whole forms a multi-point triangular support structure with high stability. Moreover, the dorsal side of the insertion fixation device 100 is flat, which does not irritate the skin and reduces the risk of infection. Finally, it achieves rapid healing and functional recovery of the bone tendon insertion point, reduces damage to the extensor tendon 300 and fixes the extensor tendon 300 to prevent proximal traction.

[0027] In this embodiment, the second fixing claw 30 is disposed between the fixing plate body 11 and the extensor tendon 300, and the height of the claw tip is controlled at any value between 0.8mm and 1.0mm. In addition to resisting the tension of the extensor tendon 300 and preventing the insertion point from slipping, it can also form a small gap between the fixing plate 10 and the tendon, so as to avoid the fixing plate 10 directly compressing the extensor tendon 300 and affecting its blood circulation and sliding function. Thus, while ensuring the stability of fixation, it further improves the biocompatibility of the device and the quality of postoperative healing.

[0028] In this embodiment, the arc-shaped blocking hook 12 has an arc-shaped structure with a preset angle. Designed according to the anatomical curvature of the dorsal side of the distal phalanx, it can precisely fit the bone surface and form a stable bony barrier against the avulsed bone fragment 200 after implantation, preventing the bone fragment from lifting or shifting. The arc-shaped hook structure can also evenly distribute stress, improve the overall fixation stability of the fixation device 100, help the bone fragment to make close contact with the base of the distal phalanx, and promote healing.

[0029] In this embodiment, the first fixing claw 20 is located on the side of the fixing plate body 11 close to the avulsed bone fragment 200. When the tension screw 40 moves the fixing plate 10, it can actively push the avulsed bone fragment 200 towards the distal phalanx for repositioning. The first fixing claw 20, together with the blocking hook 12, forms an active pressure fixation structure. Compared with the traditional passive blocking method, the repositioning accuracy and stability are higher. In addition, multiple first fixing claws 20 can distribute the force to avoid local stress concentration and prevent the avulsed bone fragment 200 from breaking.

[0030] In this embodiment, when the tension screw 40 is screwed into the middle phalanx through the screw hole 111, it can drive the fixation plate 10 to move toward the distal phalanx, thereby achieving a micro-pressure effect on the bone block. During the tightening process, the traction force generated by the tension screw 40 can promote the avulsed bone block 200 to fit more closely with the original bone surface. At the same time, the tension screw 40 can provide longitudinal stability support, further enhancing the overall fixation firmness and anti-tension ability.

[0031] In this embodiment, the fixation plate body 11 serves as a support platform connecting various functional components. It is not only sufficiently rigid but also does not protrude from the skin surface. Furthermore, its flat back design can conform to the skin on the back of the distal segment, minimizing irritation to the subcutaneous tissue and significantly reducing postoperative complications such as skin infection and necrosis. The overall rigidity of the fixation plate body 11, along with the cooperation of the blocking hook 12, the first fixing claw 20, the second fixing claw 30, and the tension screw 40, enables the entire stop point fixation device 100 to form a stable three-dimensional force system.

[0032] In a further embodiment, the preset angle is any value between 20° and 50°, meaning the arc angle of the blocking hook 12 can be 20°, 25°, 30°, 35°, 40°, 45°, or 50°, or any other value between 20° and 50°. In this embodiment, setting the arc angle of the blocking hook 12 to any value within the range of 20° to 50° allows for better adaptation to the natural curvature of the dorsal base of the distal phalanx in different patients in clinical practice, enabling the blocking hook 12 to fit more closely to the bone surface after implantation. This improves the blocking stability and repositioning fit of the avulsed bone fragment 200, reduces tissue irritation, and promotes postoperative healing.

[0033] In a further embodiment, the blocking hook 12 includes a first end away from the fixing plate body 11. The first end is set to be spaced from the end of the first fixing claw 20 by any value between 3mm and 5mm. That is, the distance between the first end of the blocking hook 12 and the end of the first fixing claw 20 can be 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, or any other value between 3mm and 5mm. In this embodiment, by setting the distance between the first end of the blocking hook 12 and the end of the first fixing claw 20 to 3mm-5mm, a suitable tissue-accommodating space is formed between them. This avoids excessive compression of subcutaneous soft tissue or tendons due to too small a distance, and also prevents tissue slippage due to too large a distance. This reduces pressure damage while ensuring the reliability of the limiting position, improves the adaptability of the stopping point fixing device 100 to tissues of different thicknesses, and further enhances the stability of the fixing plate 10 at the installation site.

[0034] like Figure 1 and Figure 4 As shown, in a further embodiment, there are multiple first fixing claws 20, which are arranged at intervals along the extension direction of the avulsed bone block 200. The distance between two adjacent first fixing claws 20 is any value between 1mm and 2mm, that is, the distance between two adjacent first fixing claws 20 can be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm or 2mm, or any other value between 1mm and 2mm. In this embodiment, by arranging multiple first fixing claws 20 at intervals of 1mm-2mm along the extension direction of the avulsed bone block 200, the fixing claws form continuous and uniform support points along the length direction of the avulsed bone block 200. This increases the contact area between the stop fixing device 100 and the avulsed bone block 200, improving the uniformity and stability of the force on the avulsed bone block 200. Furthermore, setting the distance between them to 1mm-2mm avoids the problem of local tissue compression or interference caused by the first fixing claws 200 being too dense, and also avoids the problem of discontinuous support and insecure fixation caused by the first fixing claws 200 being too sparse. This allows the avulsed bone block 200 to obtain more reliable linear support and anti-rollover ability during the repositioning and fixation process, ultimately improving the repositioning accuracy of the avulsed bone block 200 and the quality of postoperative healing.

[0035] like Figure 4 As shown, in a further embodiment, there are two second fixing claws 30, which are distributed at intervals along the width direction of the extensor tendon 300 at both ends of the fixing plate body 11. In this embodiment, by arranging the two second fixing claws 30 at both ends of the fixing plate body 11 along the width direction of the extensor tendon 300, the fixing plate 10 forms a double-point support structure in the lateral direction, thereby effectively dispersing the contact pressure between the fixing plate 10 and the extensor tendon 300 and avoiding local compression caused by single-point support. At the same time, the second fixing claws 30 distributed at both ends can stably lift the fixing plate body 11, keeping it at a safe gap with the extensor tendon 300, further preventing blood flow obstruction or tendon friction damage caused by the fixing plate 10 compressing the extensor tendon 300. In addition, this double-sided support layout also improves the anti-overturning ability of the fixing plate 10 in the lateral direction, making the device more stable and reliable after installation.

[0036] In a further embodiment, the width of the first fixing claw 20 is any value between 1.0mm and 1.5mm, and the height is any value between 0.5mm and 0.8mm. That is, the width of the first fixing claw 20 can be 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm, or any other value between 1mm and 1.5mm, and the height can be 0.5mm, 0.6mm, 0.7mm, or 0.8mm, or any other value between 0.5mm and 0.8mm. In this embodiment, by setting the width of the first fixing claw 20 to 1.0mm-1.5mm and the height to 0.5mm-0.8mm, it balances contact area and low invasiveness in terms of size. Specifically, the width of the first fixing claw 20 within the aforementioned range ensures sufficient lateral contact area with the avulsed bone fragment 200, thereby improving the support capacity for the avulsed bone fragment 200. This allows the avulsed bone fragment 200 to have a stable limiting effect in both the longitudinal and transverse directions after reduction. Furthermore, controlling the height to 0.5mm-0.8mm provides necessary support while avoiding excessive protrusion, reducing interference and compression on surrounding soft tissues (such as extensor tendons 300, synovium, etc.), and lowering the risk of discomfort during and after the operation.

[0037] In this embodiment, the optimized combination of the width and height dimensions of the first fixation claw 20 enables the first fixation claw 20 to effectively push and fix the avulsed bone fragment 200 without damaging the tissue structure due to excessive size, thereby further improving the fixation accuracy, safety and biocompatibility of the device.

[0038] In a further embodiment, the width of the second fixing claw 30 is any value between 1.5mm and 2.5mm, that is, the width of the second fixing claw 30 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm, or any other value between 1.5mm and 2.5mm. In this embodiment, by limiting the width of the second fixing claw 30 to 1.5mm-2.5mm, it has a larger lateral contact area in terms of size, thereby forming a more stable and flexible support effect for the extensor tendon 300. The wider second fixing claw 30 can form a reliable lifting point between the fixing plate body 11 and the extensor tendon 300, so that the fixing plate 10 as a whole maintains a suitable overhang clearance, avoiding direct compression of the extensor tendon 300 by the fixing plate body 11, and reducing interference with tendon blood supply and sliding function. At the same time, the increased width expands the support area, which can effectively disperse local pressure, reduce the risk of tissue compression caused by single-point stress concentration, and make the device more comfortable and safer to wear and during postoperative activities.

[0039] In this embodiment, the width of the second fixation claw 30 is in the range of 1.5mm-2.5mm, which can be compatible with the tendon thickness and finger size of different patients, so that the second fixation claw 30 achieves a balance between adaptability and support stability, thereby further improving the clinical applicability and implantation stability of the entire fixation device 100.

[0040] In a further embodiment, the thickness of the fixation plate 10 is any value between 1.2mm and 2.0mm, that is, the thickness of the fixation plate 10 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2.0mm, or any other value between 1.2mm and 2.0mm. In this embodiment, limiting the thickness of the fixation plate 10 to any value between 1.2mm and 2.0mm achieves an effective balance between strength and low invasiveness. Furthermore, its overall structural strength is sufficient to withstand the traction force from the tension screw 40 and the continuous stress after the avulsed bone fragment 200 is repositioned, ensuring that the fixation device remains stable at different stages after surgery and is not prone to deformation or loosening. At the same time, controlling the thickness to 1.2mm-2.0mm also keeps the fixation plate body 11 relatively thin, which can significantly reduce the volume occupied on the dorsal side of the distal phalanx, avoid forming protrusions that compress the skin, reduce the risk of skin irritation, ulceration, or infection, and is beneficial to the comfort of the postoperative patient.

[0041] In a further embodiment, the diameter of the tension screw 40 is any value between 1.8mm and 2.0mm, that is, the diameter of the tension screw 40 can be 1.8mm, 1.85mm, 1.9mm, 1.95mm, or 2.0mm, or any other value between 1.8mm and 2.0mm. In this embodiment, the diameter of the tension screw 40 is set within the range of 1.8mm-2.0mm, which can provide sufficient tensile strength and pull-out resistance, so that the tension screw 40 can firmly pull the fixation plate 10 forward when screwed in, thereby effectively driving the first fixation claw 20 and the blocking hook 12 to apply pressure to the distal phalanx and tear away the bone fragment 200, achieving a reliable pressure reduction effect. It can also control the degree of invasion of the tension screw 40 into the intermediate phalanx 400, and will not cause cortical bone fracture, bone damage, or postoperative pain due to the tension screw 40 being too thick, and will also avoid loosening, stripping, or insufficient traction efficiency due to the tension screw 40 being too thin.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A fixed stop device for a bony hammer finger, characterized in that The bone hammer-shaped finger stop point fixing device comprises a fixing plate, at least one first fixing claw, at least one second fixing claw, and a plurality of tension screws. The fixing plate comprises a fixing plate body and a blocking hook protruding towards a side away from the fixing plate body, the fixing plate body is provided with a plurality of screw holes, and the blocking hook is in an arc structure with a preset angle and is used for fixing a torn bone block. The first fixing claw is located on a side of the fixing plate body close to the torn bone block, and the first fixing claw is arranged to abut against the torn bone block at an end thereof. The second fixing claw is located on a side of the fixing plate body close to an extensor tendon and away from the first fixing claw, and the height of the second fixing claw is any value within a range of 0.8 mm to 1.0 mm. The tension screw is arranged to be screwed into a middle phalanx through the screw hole, so that the tension screw drives the fixing plate to move towards a distal phalanx when being screwed, to drive the first fixing claw to push the torn bone block to move towards the distal phalanx.

2. The bone hammer-shaped finger stop point fixing device according to claim 1, wherein the preset angle is any value within a range of 20° to 50°.

3. The bone hammer-shaped finger stop point fixing device according to claim 2, wherein the blocking hook comprises a first end away from the fixing plate body, and the first end is arranged to be spaced apart from an end of the first fixing claw by any value within a range of 3 mm to 5 mm.

4. The bone hammer-shaped finger stop point fixing device according to claim 3, wherein the number of the first fixing claws is a plurality, and the plurality of first fixing claws are arranged to be spaced apart along an extension direction of the torn bone block, and the spacing between adjacent two first fixing claws is any value within a range of 1 mm to 2 mm.

5. The bone hammer-shaped finger stop point fixing device according to claim 4, wherein the number of the second fixing claws is two, and the two second fixing claws are spaced apart at two ends of the fixing plate body along a width direction of the extensor tendon.

6. The bone hammer-shaped finger stop point fixing device according to any one of claims 1 to 5, wherein the width of the first fixing claw is any value within a range of 1.0 mm to 1.5 mm, and the height of the first fixing claw is any value within a range of 0.5 mm to 0.8 mm.

7. The bone hammer-shaped finger stop point fixing device according to claim 6, wherein the width of the second fixing claw is any value within a range of 1.5 mm to 2.5 mm.

8. The bone hammer-shaped finger stop point fixing device according to claim 7, wherein the thickness of the fixing plate is any value within a range of 1.2 mm to 2.0 mm.

9. The bone hammer-shaped finger stop point fixing device according to claim 8, wherein the diameter of the tension screw is any value within a range of 1.8 mm to 2.0 mm. ​ ​ ​ ​ ​ ​ ​ ​

Images