External fixation instrument for traction of bony hammer-shaped fingers

Abstract

The utility model provides an external fixation instrument for traction of bone hammer-shaped fingers. The external fixation instrument comprises a fingerstall, a screw rod and a threaded ring, the external shape of the fingerstall is in a square box shape, one end of the fingerstall is open, the fingerstall is used for wrapping the fingertip, the outer side wall of the fingerstall is connected with one end of the screw rod, and the threaded ring is matched with the screw rod. The U-shaped clamp made of an aluminum plate is matched with the bandage to clamp and fix the bony hammer-shaped finger, then the fingerstall is adopted to wrap the fingertip, and the threaded ring is rotated in a matched mode, so that the threaded ring drives the fingerstall to move through the screw rod, the finger is pulled, the tail section of the bony hammer-shaped finger is straightened or the back of the bony hammer-shaped finger is slightly stretched, and the bony hammer-shaped finger is fixed. The effect of traction on the bony hammer-shaped finger under the non-surgical condition is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially is related to a kind of for traction bone mallet finger external fixation instrument. BACKGROUND

[0002] Bone mallet finger is that the finger distal segment extensor tendon is impacted by external force under straightened state, leading to the extensor tendon insertion point place avulsion fracture, so that the distal end of finger cannot be completely straightened, a kind of disease similar to hammer.

[0003] Bone mallet finger is common in clinic, and surgery is currently mostly used.The surgical method of bone mallet finger in prior art has Ishikawa method, wire threading method, double kirschner wire elastic compression method and the like, these methods although have played good effect in treatment, but they all have the following shortcomings: ①surgical cost is higher;②surgical trauma is larger;③there is the risk of skin necrosis and incision infection after operation.Conservative treatment is less developed in clinic because of no effective reduction and fixation of fracture external fixator.

[0004] Therefore, we propose a kind of for traction bone mallet finger external fixation instrument to solve the problem that external fixator cannot traction patient's finger. CONTENT OF UTILITY MODEL

[0005] In view of the shortcomings of the prior art described above, the purpose of the utility model is to provide a kind of for traction bone mallet finger external fixation instrument to solve the problem that external fixator cannot traction patient's finger.

[0006] To achieve the above object and other related purposes, the utility model provides a kind of for traction bone mallet finger external fixation instrument, including: finger cot, screw rod and screw ring;

[0007] The external shape of the finger cot is box-shaped and the right side is open, the finger cot is used to wrap the fingertip, the left side wall of the finger cot is connected with one end of the screw rod, and the screw ring is matched with the screw rod.

[0008] Preferably, the finger cot includes outer moving block and inner cladding layer, the inner cladding layer is located inside the outer moving block, the inner surface of the outer moving block is provided with hook face, and the outer surface of the inner cladding layer is provided with hair face matched with the hook face.

[0009] Preferably, the inner top surface of the inner cladding layer is provided with adhesive layer.

[0010] Preferably, the upper and lower outer surfaces of the outer moving block are each provided with a plurality of semicircular protrusions.

[0011] Preferably, the outer surface of the screw ring is provided with anti-slip layer, and the side wall edges of the outer moving block are all chamfered.

[0012] Preferably, the outer part of the threaded ring is provided with a cover.

[0013] Preferably, the clamp further comprises a U-shaped clamp and a bandage, the U-shaped clamp comprises an upper piece and a lower piece, the left side of the upper piece is provided with an opening, the sidewall of the U-shaped clamp is provided with a through hole, the threaded rod can pass through the through hole, and the bandage is used for fixing the upper piece and the lower piece on the finger.

[0014] Preferably, the sidewall of the U-shaped clamp is rotationally connected with the threaded ring, and the inner diameter of the threaded ring is smaller than the inner diameter of the through hole.

[0015] Preferably, the opposite sides of the upper piece and the lower piece are both provided with long strip-shaped grooves, and the long edges of the grooves are parallel to the long edges of the U-shaped clamp.

[0016] As described above, the utility model discloses a kind of external fixation devices for traction bone mallet finger, with the following beneficial effects: the utility model, by setting the U-shaped clamp of aluminium plate material, cooperate with the bandage to hold and fix bone mallet finger, then adopt finger sleeve to wrap finger tip, cooperate with rotating threaded ring, make threaded ring move finger sleeve by screw rod, pull finger, make bone mallet finger finger distal segment straight or slightly hyperextension, achieve the effect of traction bone mallet finger under non-surgical condition.

[0017] Meanwhile, the finger sleeve is divided into an outer moving block for traction and an inner covering layer for connecting the finger, and the outer moving block and the inner covering layer are bonded by magic tape, which facilitates the replacement of the inner covering layer when used by different patients, saves resources while ensuring hygiene.

[0018] Therefore, the utility model effectively overcomes the shortcomings of the prior art and has high industrial utilization value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A perspective view of the external fixation device for treating bone mallet finger is shown.

[0020] Figure 2 A perspective view of the clamp of the external fixation device for treating bone mallet finger is shown.

[0021] Figure 3 A perspective view of the traction mechanism of the external fixation device for treating bone mallet finger is shown.

[0022] Figure 4 An exploded view of the traction mechanism of the external fixation device for treating bone mallet finger is shown.

[0023] Figure 5 A connection structure diagram of the finger sleeve of the external fixation device for treating bone mallet finger is shown.

[0024] Figure 6 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0025] Figure 7 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0026] Figure 8 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as Figure 7 A portion of the enlarged view of the utility model.

[0027] Figure 9 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as Figure 7 A portion of the enlarged view of the utility model.

[0028] Figure 10 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0029] Figure 11 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0030] Figure 12 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0031] Figure 13 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0032] Figure 14 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0033] Figure 15 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0034] Figure 16 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0035] Figure 17 A navigation mechanism for treating the external fixation device for bone mallet finger is shown as a perspective view of the utility model.

[0036] Element number explanation

[0037] 1, clamp; 2, traction mechanism; 3, navigation mechanism; 4, positioning mechanism;

[0038] 10, U-shaped clamp; 11, strap; 12, perforation; 13, groove;

[0039] 20, finger cot; 21, screw rod; 22, threaded ring; 23, cover;

[0040] 200, outer moving block; 201, inner cladding; 202, semicircular protrusion;

[0041] 30, reset needle; 31, navigator;

[0042] 300, handle part; 301, reset part; 302, flange;

[0043] 310, barrel; 311, guide tube; 313, cover; 314, gasket; 315, transparent window; 316, extraction ring; 317, lifting block; 318, pull ring;

[0044] 40, slide rail; 41, sliding block; 42, anti-skid device; 43, positioning plate;

[0045] 420, clamping tooth; 421, clamping block; 422, adjusting assembly;

[0046] 4220, adjusting rod; 4221, gear; 4222, rack;

[0047] 430, threaded hole. DETAILED DESCRIPTION

[0048] The implementation of the present application will be described by specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0049] Please refer to Figures 1 to 17 It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to understand and read the content disclosed in the specification by those skilled in the art, and are not used to limit the conditions that can be implemented by the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" used in the specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application that can be implemented.

[0050] We have designed a complete set of medical devices for conservative treatment of bony mallet fingers, such as Figures 1-17As shown, the utility model provides a kind of for traction bone mallet finger external fixation instrument, comprising: clamp 1, traction mechanism 2, navigation mechanism 3 and positioning mechanism 4.

[0051] Clamp 1 includes U-shaped clamp 10, U-shaped clamp 10 is made of aluminum plate, U-shaped clamp 10 includes upper piece and lower piece, for fixing bone mallet finger, the opposite side of upper piece and lower piece can be additionally provided with soft pad, and comfort is strengthened, U-shaped clamp 10 is integrally formed, and the connecting portion of upper piece and lower piece is bent.U-shaped clamp 10 is provided with opening on upper piece, for exposing fracture part;Traction mechanism 2 is arranged at the bent portion inside U-shaped clamp 10, for traction bone mallet finger, positioning mechanism 4 is located above the opening of U-shaped clamp 10, for adjusting the reset path of external fixation needle, navigation mechanism 3 cooperates with positioning mechanism 4 to provide walking path for fixation needle.

[0052] In use, bone mallet finger is fixed by U-shaped clamp 10, traction mechanism 2 is used to pull finger, so that the last segment of finger is straightened or slightly hyperextended, then according to the position of fracture end shown by X-ray film, positioning mechanism 4 cooperates with navigation mechanism 3, and the insertion point of fixation needle is adjusted, after fixation needle is inserted into fracture end and resets and pressurizes fracture end, navigation mechanism 3 and positioning mechanism 4 are cooperated, and fixation needle is locked.

[0053] It should be noted that since the size of each person's finger is different, when U-shaped clamp 10 is widely used, a plurality of different models should be configured to adapt to the use of most bone mallet finger patient population.

[0054] In an embodiment, clamp 1 further includes bandage 11, and bandage 11 is used to fix upper piece and lower piece on finger, and clamp and fix finger.U-shaped clamp 10 is provided with perforation 12 on side wall, and perforation 12 leaves space for the movement of traction mechanism 2.The opposite side of upper piece and lower piece is provided with long slot 13.

[0055] In an embodiment, the traction mechanism 2 comprises a finger sleeve 20, a screw rod 21 and a threaded ring 22. The finger sleeve 20 is box-shaped with an open end and is used to wrap around the fingertip. The left side wall of the finger sleeve 20 is connected to one end of the screw rod 21, and the threaded ring 22 is matched with the screw rod 21. The threaded ring 22 is located on the outer side wall of the U-shaped clamp 10 and is rotationally connected with the U-shaped clamp 10. The inner thread of the threaded ring 22 is in communication with the through hole 12, and the inner diameter of the threaded ring 22 is smaller than the inner diameter of the through hole 12. The threaded ring 22 and the through hole 12 are located on the same center line, and the threaded ring 22 rotates around the center line. The size of the finger sleeve 20 matches the internal space of the U-shaped clamp 10, and the upper and lower surfaces of the finger sleeve 20 are in contact with the inner top surface and the inner bottom surface of the U-shaped clamp 10 respectively, preventing the finger sleeve 20 from deflecting with the screw rod 21 when the screw rod 21 is being pulled. In use, the finger sleeve 20 is wrapped around the fingertip of the bony hammer-shaped finger, placed inside the U-shaped clamp 10 near the bending position, and the screw rod 21 is inserted through the through hole 12 of the U-shaped clamp 10 and in contact with the threaded ring 22. By rotating the threaded ring 22, the screw rod 21 is pulled to the left through the threaded structure, and the finger is pulled by the finger sleeve 20, so that the distal segment of the finger is straightened or slightly hyperextended, facilitating recovery and treatment.

[0056] In an embodiment, the finger sleeve 20 comprises an outer moving block 200 and an inner covering layer 201, and the inner covering layer 201 is located inside the outer moving block 200. The outer moving block 200 and the inner covering layer 201 are made of different materials. The outer moving block 200 is mainly used to move in the U-shaped clamp 10 in cooperation with the screw rod 21, and is made of a relatively hard material such as plastic to improve the structural stability. The inner covering layer 201 is used to wrap and pull the fingertip of the finger, and is mainly made of a relatively soft material such as rubber to improve comfort. The hook surface and the fuzzy surface of the magic tape are used to paste the inner covering layer 201 and the outer moving block 200 together, which is convenient for disassembly. When using the same type of clamp 1, only the inner covering layer 201 needs to be replaced to reuse it, which saves materials and is convenient to use and has practicality. The inner top surface of the inner covering layer 201 is provided with a glue layer for gluing the fingertip and the inner covering layer 201 together to strengthen the connection between the finger and the inner covering layer 201, which is convenient for pulling. The glue layer is selected from a water-washable glue that is harmless or slightly harmful to the human body, which is convenient for removing the inner covering layer 201 by washing. The upper and lower outer surfaces of the outer moving block 200 are each provided with a plurality of semicircular protrusions 202. The semicircular protrusions 202 are matched with the grooves 13 in the U-shaped clamp 10 to limit the traction direction and prevent the finger sleeve 20 from being angularly offset during traction, which may cause traction difficulty.

[0057] In an embodiment, the outer surface of the threaded ring 22 is provided with an anti-skid layer to enhance the friction between the hand and the threaded ring 22, so as to avoid hand slipping when rotating the threaded ring 22. The outer portion of the threaded ring 22 is provided with a cover 23 which is threadedly connected to the outer side wall of the U-shaped clamp 10, and is used to cover the threaded ring 22 and the screw rod 21 extending out of the outer side wall of the U-shaped clamp 10, so as to avoid the threaded ring 22 driving the screw rod 21 to rotate when being accidentally touched, thereby changing the pulling force on the bony hammer-like finger and affecting the pulling effect on the finger.

[0058] In an embodiment, the navigation mechanism 3 comprises a reset needle 30 and a navigator 31. The reset needle 30 comprises a handle portion 300 and a reset portion 301. The handle portion 300 is symmetrically recessed inward on both sides to form a hand holding groove for hand holding, and the reset portion 301 is used to penetrate into the fracture end and press and reset the fracture end.

[0059] The navigator 31 comprises a barrel 310 and a cover 313. The bottom of the barrel 310 is conical, and the conical bottom is provided with a guide tube 311. The outer surface of the guide tube 311 is provided with threads. The cover 313 can cover the top of the barrel 310. The reset needle 30 can be inserted into the navigator 31, and the reset portion 301 of the reset needle 30 can penetrate out of the guide tube 311.

[0060] In an embodiment, the diameter of the handle portion 300 is greater than the diameter of the reset portion 301, which is beneficial for hand holding. The edge of the handle portion 300 is provided with a flange 302. The flange 302 at the tail of the handle portion 300 can be placed into the inside of the barrel 310, so as to facilitate the cover 313 to block the reset needle 30.

[0061] The navigator further comprises a plurality of layers of gaskets 314, all of which are located between the cover 313 and the handle portion 300. The gaskets 314 are used to compensate for the gap between the handle portion 300 and the cover 313, so as to avoid the reset needle 30 loosening when the reset needle 30 is pressing and resetting the fracture end, which results in the pressing force on the fracture end being too small and affecting the recovery and treatment of the bony hammer-like finger. When the pressing force of the reset needle 30 on the fracture end is small, the number of gaskets 314 can be increased to advance the reset needle 30, so as to provide the pressing force on the fracture end.

[0062] It should be noted that the reset needle 30 is the same object as the fixing needle described above, and the reset needle 30 will be used instead of the fixing needle hereinafter.

[0063] In an embodiment, the inner part of the barrel 310 is provided with an extraction ring 316, the inner diameter of the extraction ring 316 is greater than the diameter of the handle 300 and less than the diameter of the flange 302, and the extraction ring 316 is located below the reset needle 30. The two sides of the extraction ring 316 extend outward to form lifting blocks 317, both of which penetrate the barrel 310, and both sides of the barrel 310 are provided with lifting grooves corresponding to the lifting blocks 317, and the lifting blocks 317 slide up and down in the lifting grooves. The other end of each of the two lifting blocks 317 is rotationally connected to the same U-shaped pull ring 318, and the U-shaped pull ring 318 is located outside the barrel 310. In use, by pulling the U-shaped pull ring 318, the U-shaped pull ring 318 drives the extraction ring 316 to rise relative to the barrel 310 through the lifting blocks 317, and the extraction ring 316 contacts the flange 302 of the reset needle 30 during the rising process and drives the entire reset needle 30 to rise, thereby taking out the reset needle 30 from the barrel 310.

[0064] The side wall of the barrel 310 is also provided with a vertical transparent window 315, and the transparent window 315 is also marked with a scale. The position of the reset needle 30 inside the barrel 310 can be observed through the transparent window 315, which facilitates the up and down adjustment of the reset needle 30 according to the scale.

[0065] In an embodiment, the positioning mechanism 4 includes two slide rails 40, two slide blocks 41, a positioning plate 43, and a slip stopper 42.

[0066] The two slide rails 40 are in a long strip structure, each of which is provided with a slide block 41, each of which can slide on the corresponding slide rail 40, and the positioning plate 43 is arranged between the two slide blocks 41. When the slide blocks 41 stop moving, the slip stopper 42 can simultaneously lock the two slide blocks 41 on the two corresponding slide rails 40, respectively. The longitudinal section of the positioning plate 43 is semicircular, and the positioning plate 43 is provided with a plurality of threaded holes 430. All the threaded holes 430 correspond to the threads on the outer surface of the guide tube 311, so that the barrel 310 can be screwed with the threaded holes 430 through the external threads of the guide tube 311, thereby fixing the barrel 310 on the positioning plate 43. In cooperation with the cover 313 and the gasket 314, the reset needle 30 is locked.

[0067] In use, according to the position of the fracture end shown by the X-ray film, the slide block 41 is slid, the slide block 41 drives the positioning plate 43 to move to the proximal end of the fracture end, and the positioning plate 43 is fixed above the opening of the U-shaped clamp 10 by locking the slide block 41 with the slip stopper 42, thereby being located at the proximal end of the fracture end.

[0068] In an embodiment, the anti-skid device 42 comprises a catch 420, the middle part of the slide rail 40 is provided with a sliding groove, the catch 420 is arranged inside the sliding groove, the bottom of each slide block 41 is provided with a clamping block 421 matched with the catch 420, the upper end of the catch 420 is connected with an adjusting assembly 422 for controlling the clamping block 421 to move up and down; in use, the clamping block 421 is controlled to move downward by the adjusting assembly 422, and is engaged with the sawtooth on the upper surface of the catch 420, so that the slide block 41 is fixed at any position of the slide rail 40.

[0069] The adjusting assembly 422 comprises an adjusting rod 4220 connected with the two slide blocks 41, the adjusting rod 4220 is in a U-shaped structure, the two ends of the adjusting rod 4220 are further provided with arc-shaped structures, the two ends of the adjusting rod 4220 are connected with gears 4221, each slide block 41 is provided with a rack 4222 matched with the gear 4221, the lower end of each rack 4222 penetrates through the slide block 41 and is connected with a clamping block 421, and the middle parts of the two ends of the adjusting rod 4220 are elastically connected with the upper ends of the two slide blocks 41.

[0070] In use, the outer side end of the adjusting rod 4220 is lifted to drive the gear 4221 to rotate, the gear 4221 drives the rack 4222 to rise, the rack 4222 drives the clamping block 421 to rise, the clamping block 421 is separated from the catch 420, the fixing between the two slide blocks 41 and the two slide rails 40 is cancelled, and the slide block 41 slides on the slide rail 40; after the stopping position is determined, the adjusting rod 4220 is loosened, the adjusting rod 4220 is automatically reset under the elastic action, the gear 4221 reversely rotates, the rack 4222 moves downward, and the clamping block 421 is pushed to be clamped on the catch 420 again, so that the slide block 41 is fixed on the slide rail 40. The slide and locking of the slide block 41 on the slide rail 40 are facilitated.

[0071] The elastic connection between the middle parts of the two ends of the adjusting rod 4220 and the two slide blocks 41 is spring connection.

[0072] The specific use process of the utility model is as follows:

[0073] The appropriate type of U-shaped clamp 10 and finger sleeve 20 is selected according to the size of the fingers of the patient's bony clubbing fingers;

[0074] The fingertips of the bony clubbing fingers are placed into the finger sleeve 20, and the fingertips and the finger sleeve 20 are connected together by using a glue layer;

[0075] Then the fingers and the finger sleeve 20 are placed into the U-shaped clamp 10, and the screw rod 21 passes through the perforation 12 of the U-shaped clamp 10 and contacts the threaded ring 22;

[0076] The threaded ring 22 is rotated, the threaded ring 22 stretches the finger sleeve 20 and the fingers through the screw rod 21, so that the distal segment of the bony clubbing fingers is straightened or slightly hyperextended.

[0077] After adjustment, the cover 23 is screwed with the U-shaped clamp 10, and the threaded ring 22 is covered and protected;

[0078] According to the position of the fracture end shown by the X-ray film, the position that the positioning plate 43 needs to move is determined;

[0079] By lifting the middle part of the adjusting rod 4220, the adjusting rod 4220 drives the gear 4221 to rotate, the gear 4221 drives the rack 4222 to rise, the rack 4222 drives the clamping block 421 to rise, the clamping block 421 is separated from the clamping teeth 420, the fixing between the two sliding blocks 41 and the two sliding rails 40 is cancelled, and the sliding block 41 slides on the sliding rail 40;

[0080] The positioning plate 43 is translated on the opening of the U-shaped clamp 10 by sliding the sliding block 41, and the U-shaped clamp 10 is moved to the proximal end of the fracture end;

[0081] The adjusting rod 4220 is loosened, the adjusting rod 4220 is automatically reset under the elastic action, the gear 4221 is reversely rotated, the rack 4222 is moved downward and pushes the clamping block 421 to be clamped on the clamping teeth 420 again, the sliding block 41 is fixed on the sliding rail 40, and then the positioning plate 43 is fixed at the proximal end of the fracture end;

[0082] According to the position of the fracture end shown by the X-ray film, the insertion angle and position of the reduction needle 30 are selected, and the threaded hole 430 coinciding with the path of the reduction needle 30 is determined;

[0083] The guide tube 311 is screwed into the selected threaded hole 430, and the cylinder body 310 is fixedly connected with the positioning plate 43;

[0084] The reduction needle 30 is inserted into the cylinder body 310, the reduction part 301 of the reduction needle 30 is inserted into the fracture end through the guide tube 311 and is pressed;

[0085] After the fracture reduction and fixation are determined to be good through C-arm perspective, the gasket 314 is put in to fill the remaining space, the cover 313 is connected with the cylinder body 310, the internal space of the cylinder body 310 is closed, the reduction needle 30 is locked, and the operation is completed.

[0086] The above embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art under the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An external fixation device for traction of a bony hammer toe, comprising: Include: Fingerstall (20), screw rod (21) and threaded ring (22), clamp (1); The outer shape of the fingerstall (20) is box-shaped and the right side is open, the fingerstall (20) is used for wrapping the fingertip, the left side wall of the fingerstall (20) is connected with one end of the screw rod (21), the threaded ring (22) is matched with the screw rod (21); The clamp (1) includes a U-shaped clamp (10) and a strap (11), the U-shaped clamp (10) includes an upper piece and a lower piece, the left side of the upper piece is provided with an opening, the side wall of the U-shaped clamp (10) is provided with a through hole (12), the screw rod (21) can pass through the through hole (12) exactly, the strap (11) is used for fixing the upper piece and the lower piece on the finger.

2. The external fixation device for the treatment of mallet finger according to claim 1, wherein: The fingerstall (20) includes an outer moving block (200) and an inner cladding layer (201), the inner cladding layer (201) is located inside the outer moving block (200), the inner surface of the outer moving block (200) is provided with a hook surface, and the outer surface of the inner cladding layer (201) is provided with a hair surface matched with the hook surface.

3. The external fixation device for the treatment of mallet finger according to claim 2, wherein: The inner top surface of the inner cladding layer (201) is provided with a glue layer.

4. The external fixation device for the treatment of mallet finger according to claim 2, wherein: The upper and lower outer surfaces of the outer moving block (200) are both provided with a plurality of semicircular protrusions (202).

5. The external fixation device for the treatment of mallet finger according to claim 4, wherein: The outer surface of the threaded ring (22) is provided with an anti-skid layer, and the side wall edges of the outer moving block (200) are all chamfered.

6. The external fixation device for the treatment of mallet finger according to claim 1, wherein: The outer surface of the threaded ring (22) is provided with a cover (23).

7. The external fixation device for the treatment of mallet finger according to claim 1, wherein: The side wall of the U-shaped clamp (10) is rotationally connected with the threaded ring (22), and the inner diameter of the threaded ring (22) is smaller than the inner diameter of the through hole (12).

8. The external fixation device for the treatment of mallet finger according to claim 1, wherein: The opposite sides of the upper piece and the lower piece are both provided with a long strip-shaped groove (13), and the long side of the groove (13) is parallel to the long side of the U-shaped clamp (10). The opposite sides of the upper piece and the lower piece are both provided with a long strip-shaped groove (13), and the long side of the groove (13) is parallel to the long side of the U-shaped clamp (10).

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