External fixing device for treating bony hammer finger

Abstract

The invention provides an external fixing device for treating bony hammer fingers. The external fixing device comprises a clamp, a traction mechanism, a navigation mechanism and a positioning mechanism, the clamp comprises a U-shaped clamp, the U-shaped clamp comprises an upper piece and a lower piece and is used for fixing the bony hammer-shaped finger, and an opening is formed in the upper piece of the U-shaped clamp and is used for exposing a fracture part; the traction mechanism is arranged at the bent position in the U-shaped clamp and used for conducting traction on the bony hammer-shaped finger. The positioning mechanism is located above an opening of the U-shaped clamp and used for adjusting the transverse path of the external fixing needle. During use, the clamp is arranged to fix the bony hammer-shaped finger, the traction mechanism is arranged at the bending part, namely the fingertip part, of the clamp and used for pulling the finger to straighten the tail section of the finger or slightly stretch the back of the finger, and then the positioning mechanism and the navigation mechanism are matched with each other to lock the fixing needle for pressurizing and resetting the fracture end. The effect of avoiding an operation while effective treatment is achieved, and the treatment safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, and in particular to an external fixation device for treating bony mallet fingers. Background Art

[0002] Bony hammer finger refers to a condition in which the extensor tendon of the distal phalanx of the finger is hit by external force when it is in an extended state, resulting in avulsion fracture at the insertion point of the extensor tendon, making it impossible for the end of the finger to be fully straightened, resembling a hammer.

[0003] Bony mallet finger is common in clinical practice. Conservative treatment is mostly surgical because there is no external fixator that can effectively reduce and fix the fracture. In the prior art, surgical methods for skeletal mallet finger include Ishiguro method, wire insertion method, double Kirschner wire elastic compression method, etc. Although these methods have a good effect in treatment, they all have the following disadvantages:

[0004] ① The cost of surgery is high;

[0005] ② The surgical trauma is relatively large;

[0006] ③There is a risk of skin necrosis and incision infection after surgery.

[0007] In order to avoid a series of disadvantages of surgery, we designed an external fixation device for the treatment of bony mallet fingers, which can effectively treat the disease while avoiding surgery. Summary of the invention

[0008] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an external fixation device for treating skeletal mallet fingers, which can effectively treat the disease while avoiding surgery.

[0009] To achieve the above-mentioned and other related purposes, the present invention provides an external fixation device for treating bony mallet fingers, comprising: a clamp, a traction mechanism, a navigation mechanism and a positioning mechanism;

[0010] The clamp comprises a U-shaped clamp, and the U-shaped clamp comprises an upper plate and a lower plate, and is used to fix the bony mallet finger. The upper plate of the U-shaped clamp is provided with an opening, and is used to expose the fractured part.

[0011] The traction mechanism is arranged at the bend inside the U-shaped clamp and is used to traction the bony hammer finger;

[0012] The positioning mechanism is located above the U-shaped clip opening and is used to adjust the reset path of the external fixing needle;

[0013] The navigation mechanism cooperates with the positioning mechanism to provide a moving path for the fixing needle.

[0014] Preferably, the clamp further comprises a strap, and the strap is used to fix the upper piece and the lower piece on the fingers, the side wall of the U-shaped clamp is provided with a perforation, and the facing sides of the upper piece and the lower piece are provided with a long strip groove.

[0015] Preferably, the traction mechanism comprises a finger sleeve, a screw rod and a threaded ring;

[0016] The outer shape of the finger sleeve is a square box with one end being open. The finger sleeve is used to wrap the fingertip. The left side wall of the finger sleeve is connected to one end of the screw rod, and the threaded ring matches the screw rod.

[0017] Preferably, the finger sleeve comprises an outer moving block and an inner covering layer, the inner covering layer is located inside the outer moving block, an inner top surface of the inner covering layer is provided with an adhesive layer, and the upper and lower outer surfaces of the outer moving block are both provided with a plurality of semicircular protrusions.

[0018] Preferably, an anti-slip layer is provided on the outer surface of the threaded ring, and a cover is provided on the outside of the threaded ring.

[0019] Preferably, the navigation mechanism comprises: a reset needle and a navigator;

[0020] The reset needle comprises a handle portion and a reset portion;

[0021] The navigator comprises a cylinder and a cover, the bottom of the cylinder is conical, a guide tube is arranged at the bottom of the cone, a thread is arranged on the outer surface of the guide tube, and the cover can cover the top of the cylinder;

[0022] The resetting needle can be just inserted into the navigator, and the resetting portion of the resetting needle can pass through the guide tube.

[0023] Preferably, the diameter of the handle portion is larger than the diameter of the reset portion, and a flange is provided on the edge of the handle portion;

[0024] A plurality of gaskets are arranged inside the cylinder, and all the gaskets are located between the sealing cover and the handle.

[0025] Preferably, an extraction ring is provided inside the cylinder, and both sides of the extraction ring extend outward to form lifting blocks, and the other ends of the two lifting blocks are rotatably connected to the same U-shaped pull ring.

[0026] Preferably, the positioning mechanism includes two slide rails, two slide blocks, a positioning plate and a skid stopper;

[0027] The two slide rails are in a long strip structure as a whole, each of the slide rails is provided with a slider, each of the sliders can slide on the corresponding slide rail, the positioning plate is arranged between the two sliders, and when the slider stops moving, the anti-slip device can simultaneously lock the two sliders on the two corresponding slide rails respectively;

[0028] The longitudinal section of the positioning plate is semicircular, and a plurality of threaded holes are arranged on the positioning plate.

[0029] Preferably, the anti-slip device includes a latch tooth, a slide groove is provided in the middle of the slide rail, the latch tooth is arranged inside the slide groove, a block matching the latch tooth is provided at the bottom of each of the slide blocks, and an adjustment component is connected to the upper end of the latch tooth to control the block to move up and down;

[0030] The adjustment assembly includes an adjustment rod connected to two sliders, both ends of the adjustment rod are connected to gears, each slider is provided with a rack matching the gear, the lower end of each rack passes through the slider and is connected to a block, and the middle parts of the two ends of the adjustment rod are elastically connected to the upper ends of the two sliders.

[0031] As described above, the external fixation device for treating bony mallet finger disclosed by the present invention has the following beneficial effects:

[0032] 1. The present invention fixes the bony mallet finger by setting a clamp, and sets a traction mechanism at the bending part of the clamp, i.e., the fingertip, for pulling the finger so that the distal segment of the finger is straightened or slightly extended, and then the positioning mechanism 4 and the navigation mechanism 3 cooperate with each other to lock the fixation needle for pressurizing and resetting the fracture end, thereby achieving the effect of avoiding surgery while achieving effective treatment, and improving the safety of treatment.

[0033] 2. The present invention provides a U-shaped clamp made of aluminum plate and cooperates with a strap to clamp and fix the bony hammer finger, then uses a finger sleeve to wrap the fingertip, and rotates the threaded ring to drive the finger sleeve to move through the screw rod to pull the finger, so that the distal segment of the bony hammer finger is straightened or slightly extended, thereby achieving the effect of traction of the bony hammer finger under non-surgical conditions.

[0034] 3. The present invention determines the position where the positioning plate needs to be moved according to the position of the fracture end shown by the X-ray film; by lifting the middle part of the adjusting rod, the adjusting rod drives the gear to rotate, the gear drives the rack to rise, and the rack drives the clamping block to rise, so that the clamping block is separated from the clamping tooth, and the fixation between the two sliders and the two slide rails is cancelled, so that the sliders slide on the slide rails, thereby moving the U-shaped clamp to the proximal end of the fracture end, loosening the adjusting rod, and the adjusting rod automatically resets under the action of elasticity, thereby fixing the positioning plate at the proximal end of the fracture end, achieving the effect of conveniently adjusting the lateral path of the fixing needle.

[0035] 4. The present invention selects the insertion angle and position of the reduction needle according to the position of the fracture end shown by X-ray film, and determines the threaded hole that coincides with the path of the reduction needle; screws the thread on the outer surface of the guide tube into the selected threaded hole to fix the cylinder body and the positioning plate; inserts the reduction needle into the cylinder body, and allows the reduction part of the reduction needle to pass through the guide tube and insert into the fracture end and apply pressure; after confirming that the fracture is reduced and fixed well through C-arm fluoroscopy, inserts a gasket to fill the remaining space, and then connects the cover to the cylinder body to close the internal space of the cylinder body to achieve the effect of locking the reduction needle.

[0036] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Shown is a stereoscopic view of an external fixation device for treating skeletal mallet fingers according to the present invention.

[0038] Figure 2 Shown is a stereoscopic view of a clamp of an external fixation device for treating skeletal mallet fingers according to the present invention.

[0039] Figure 3 Shown is a stereoscopic view of a traction mechanism of an external fixation device for treating bony mallet fingers according to the present invention.

[0040] Figure 4 Shown is an exploded view of a traction mechanism of an external fixation device for treating bony mallet fingers according to the present invention.

[0041] Figure 5 Shown is a finger sleeve connection structure diagram of an external fixation device for treating bony mallet fingers according to the present invention.

[0042] Figure 6 Shown is a stereoscopic view of a navigation mechanism of an external fixation device for treating bony mallet fingers according to the present invention.

[0043] Figure 7 Shown is a cross-sectional stereoscopic view of a navigation mechanism of an external fixation device for treating bony mallet fingers according to the present invention.

[0044] Figure 8 The present invention shows an external fixation device for treating bony mallet fingers. Figure 7 Enlarged view of part A.

[0045] Fig. 9 The present invention shows an external fixation device for treating bony mallet fingers. Figure 7 Enlarged view of part B.

[0046] Fig.10 Shown is a navigator stereogram of an external fixation device for treating bony mallet fingers according to the present invention.

[0047] Fig.11 Shown is a stereoscopic view of a reduction needle of an external fixation device for treating bony mallet fingers according to the present invention.

[0048] Fig.12 Shown is a stereoscopic view of a positioning mechanism of an external fixation device for treating bony mallet fingers according to the present invention.

[0049] Fig.13 Shown is a stereoscopic view of a positioning plate of an external fixation device for treating bony mallet fingers according to the present invention.

[0050] Fig.14 Shown is a three-dimensional cross-sectional view of a positioning plate of an external fixation device for treating bony mallet fingers according to the present invention.

[0051] Fig.15 Shown is a stereoscopic view of an anti-slip device of an external fixation device for treating bony mallet fingers according to the present invention.

[0052] Fig.16 Shown is a diagram of a slider connection mechanism of an external fixation device for treating bony mallet fingers according to the present invention.

[0053] Fig.17 Shown is a three-dimensional cross-sectional view of a slider of an external fixation device for treating bony mallet fingers according to the present invention.

[0054] Component number description

[0055] 1. Clamp; 2. Traction mechanism; 3. Navigation mechanism; 4. Positioning mechanism;

[0056] 10. U-shaped clip; 11. Binding strap; 12. Perforation; 13. Groove;

[0057] 20. Finger sleeve; 21. Screw; 22. Threaded ring; 23. Cover;

[0058] 200, outer moving block; 201, inner covering layer; 202, semicircular protrusion;

[0059] 30. Reset needle; 31. Navigator;

[0060] 300, handle portion; 301, reset portion; 302, flange;

[0061] 310, cylinder; 311, guide tube; 313, cover; 314, gasket; 315, transparent window; 316, extraction ring; 317, lifting block; 318, pull ring;

[0062] 40. Slide rail; 41. Sliding block; 42. Anti-slip device; 43. Positioning plate;

[0063] 420, latching teeth; 421, latching block; 422, adjusting assembly;

[0064] 4220, adjusting rod; 4221, gear; 4222, rack;

[0065] 430.Threaded hole. DETAILED DESCRIPTION

[0066] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0067] See also Figures 1 to 17 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0068] like Figure 1-17 As shown, the present invention provides an external fixation device for treating bony mallet fingers, comprising: a clamp 1, a traction mechanism 2, a navigation mechanism 3 and a positioning mechanism 4.

[0069] The clamp 1 includes a U-shaped clamp 10, which is made of aluminum plate. The U-shaped clamp 10 includes an upper plate and a lower plate, which are used to fix the bony mallet finger. The facing sides of the upper plate and the lower plate can be provided with cushions to enhance comfort. The U-shaped clamp 10 is an integrally formed setting, and the connection between the upper plate and the lower plate is bent. The upper plate of the U-shaped clamp 10 is provided with an opening for exposing the fracture part; the traction mechanism 2 is provided at the bending part inside the U-shaped clamp 10, which is used to traction the bony mallet finger. The positioning mechanism 4 is located above the opening of the U-shaped clamp 10, which is used to adjust the reset path of the external fixation needle. The navigation mechanism 3 cooperates with the positioning mechanism 4 to provide a walking path for the fixation needle.

[0070] When in use, the bony hammer finger is fixed by the U-shaped clamp 10, and the traction mechanism 2 is used to pull the finger so that the distal segment of the finger is straightened or slightly extended, and then according to the position of the fracture end shown by the X-ray film, the positioning mechanism 4 is coordinated with the navigation mechanism 3 to adjust the insertion point of the fixing needle. After the fixing needle is inserted into the fracture end and the fracture end is repositioned and pressurized, the navigation mechanism 3 and the positioning mechanism 4 are coordinated to lock the fixing needle.

[0071] It should be noted that, since the size of each person's finger is different, when the U-shaped clamp 10 is widely used, a variety of different models should be configured to adapt to the use of most patients with skeletal mallet fingers.

[0072] In one embodiment, the clamp 1 further includes a strap 11, which is used to fix the upper and lower pieces on the fingers to clamp and fix the fingers. A through hole 12 is provided on the side wall of the U-shaped clamp 10, and the through hole 12 leaves space for the movement of the traction mechanism 2. Long strip grooves 13 are provided on the facing sides of the upper and lower pieces.

[0073] In one embodiment, the traction mechanism 2 includes a finger sleeve 20, a screw rod 21, and a threaded ring 22. The outer shape of the finger sleeve 20 is box-shaped and one end is open. The finger sleeve 20 is used to wrap the fingertips. The left side wall of the finger sleeve 20 is connected to one end of the screw rod 21, and the threaded ring 22 matches the screw rod 21. The threaded ring 22 is located on the outer side wall of the U-shaped clamp 10 and is rotatably connected to the U-shaped clamp 10. The inner thread of the threaded ring 22 is connected to 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. 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, to prevent the finger sleeve 20 from deflecting with the screw rod 21 when the screw rod 21 is pulled. When in use, the finger sleeve 20 is used to wrap the fingertip of the bony hammer finger, and the finger sleeve 20 is placed on the inner side of the U-shaped clamp 10 near the bend, so that the screw rod 21 passes through the through hole 12 of the U-shaped clamp 10 and contacts the threaded ring 22. The threaded ring 22 is rotated, and the screw rod 21 is pulled to the left through the threaded structure. The screw rod 21 pulls the finger through the finger sleeve 20, so that the distal segment of the finger is straightened or slightly extended, which is convenient for recovery and treatment.

[0074] In one embodiment, the finger sleeve 20 includes 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 cooperate with the screw 21 to move in the U-shaped clamp 10, and a harder material such as plastic is used to improve the structural stability; the inner covering layer 201 is used to wrap and pull the fingertips, and a softer material such as rubber is mainly used to improve comfort. The inner covering layer 201 and the outer moving block 200 are attached together using the hook surface and the wool surface of the Velcro, which is convenient for disassembly. When using the same model of the clamp 1, only the inner covering layer 201 needs to be replaced and reused, which saves materials, is easy to use, and has practicality. The inner top surface of the inner covering layer 201 is provided with an adhesive layer, which is used to glue the fingertips to the inner covering layer 201, strengthen the tightness of the connection between the finger and the inner covering layer 201, and facilitate pulling. The adhesive layer is made of water-washable glue that is harmless or slightly harmful to the human body, so that the inner covering layer 201 can be removed by washing, making it more convenient to remove the inner covering layer 201. The upper and lower outer surfaces of the outer moving block 200 are both provided with a plurality of semicircular protrusions 202. The semicircular protrusions 202 match the grooves 13 in the U-shaped clip 10, and are used to limit the pulling direction to prevent the finger sleeve 20 from angularly deviating during the pulling process, resulting in pulling difficulties.

[0075] In one 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, and prevent the hand from slipping when the threaded ring 22 is rotated. A cover 23 is provided on the outside of the threaded ring 22, and the cover 23 is threadedly connected to the outer wall of the U-shaped clip 10, and is used to cover the threaded ring 22 and the screw rod 21 extending from the outer wall of the U-shaped clip 10, so as to prevent the threaded ring 22 from driving the screw rod 21 to rotate when accidentally touched, thereby changing the pulling force on the bony mallet finger and affecting the pulling effect on the finger.

[0076] In one embodiment, the navigation mechanism 3 includes: a reduction needle 30 and a navigator 31; the reduction needle 30 includes a handle portion 300 and a reduction portion 301; the handle portion 300 has two symmetrical sides that are respectively recessed inward to form a hand-holding groove for holding, and the reduction portion 301 is used to penetrate into the fracture end and pressurize and reduce the fracture end.

[0077] The navigator 31 includes a cylinder 310 and a cover 313. The bottom of the cylinder 310 is conical, and a guide tube 311 is provided at the bottom of the cone. The outer surface of the guide tube 311 is provided with a thread, and the cover 313 can cover the top of the cylinder 310; the reset needle 30 can be inserted into the navigator 31, and the reset part 301 of the reset needle 30 can pass through the guide tube 311.

[0078] In one embodiment, the diameter of the handle 300 is larger than that of the reset portion 301, which is convenient for holding. A flange 302 is provided on the edge of the handle 300; the flange 302 at the tail of the handle 300 can be placed in the cylinder 310, so that the cover 313 can seal the reset needle 30.

[0079] The navigator further includes several layers of gaskets 314, all of which are located between the cover 313 and the handle 300. The gaskets 314 are used to compensate for the gap between the handle 300 and the cover 313, to prevent the reduction needle 30 from loosening when the reduction needle 30 applies pressure to the fracture end, resulting in too little pressure on the fracture end, affecting the recovery and treatment of bony mallet fingers. When the pressure on the fracture end by the reduction needle 30 is small, the reduction needle 30 can be advanced by increasing the number of gaskets 314 to provide pressure on the fracture end.

[0080] It should be noted that the reset needle 30 and the fixing needle described above are the same object, and the reset needle 30 will be used as a replacement in the following text.

[0081] In one embodiment, an extraction ring 316 is provided inside the cylinder 310, and the inner diameter of the extraction ring 316 is larger than the diameter of the handle 300 and smaller than the diameter of the flange 302, and the extraction ring 316 is located below the reset needle 30. Both sides of the extraction ring 316 extend outward to form a lifting block 317, and the two lifting blocks 317 penetrate the cylinder 310, and both sides of the cylinder 310 are provided with a lifting groove corresponding to the lifting block 317, and the lifting block 317 is located in the lifting groove and slides up and down. The other ends of the two lifting blocks 317 are rotatably connected to the same U-shaped pull ring 318, and the U-shaped pull ring 318 is located outside the cylinder 310. When 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 cylinder 310 through the lifting block 317. During the rising process, the extraction ring 316 contacts the flange 302 of the reset needle 30 and drives the entire reset needle 30 to rise, and the reset needle 30 is taken out of the cylinder 310.

[0082] A vertical transparent window 315 is also provided on the side wall of the cylinder 310 . The transparent window 315 is also marked with scales. The position of the reset needle 30 inside the cylinder 310 can be observed through the transparent window 315 , so that the reset needle 30 can be adjusted up and down according to the scales.

[0083] In one embodiment, the positioning mechanism 4 includes two slide rails 40, two sliders 41, a positioning plate 43 and a skid stopper 42;

[0084] The two slide rails 40 are in a long strip structure as a whole. Each slide rail 40 is provided with a slider 41. Each slider 41 can slide on the corresponding slide rail 40. The positioning plate 43 is provided between the two sliders 41. When the slider 41 stops moving, the anti-slip device 42 can simultaneously lock the two sliders 41 on the two corresponding slide rails 40. The longitudinal section of the positioning plate 43 is semicircular, and a plurality of threaded holes 430 are provided on the positioning plate 43. All threaded holes 430 correspond to the threads on the outer surface of the guide tube 311, so that the cylinder 310 can be threadedly connected with the threaded holes 430 through the external threads of the guide tube 311, and the cylinder 310 can be fixed on the positioning plate 43, and cooperate with the cover 313 and the gasket 314 to achieve the locking of the reset needle 30.

[0085] When in use, according to the position of the fracture end shown by the X-ray film, the slider 41 is slid, and the slider 41 drives the positioning plate 43 to move to the proximal end of the fracture end. The slider 41 is locked by the anti-slip device 42, so that the positioning plate 43 is fixed above the opening of the U-shaped clamp 10 and is located at the proximal end of the fracture end.

[0086] In one embodiment, the anti-slip device 42 includes a latch tooth 420, a slide groove is provided in the middle of the slide rail 40, the latch tooth 420 is arranged inside the slide groove, and a block 421 matching the latch tooth 420 is provided at the bottom of each slider 41. The upper end of the latch tooth 420 is connected to an adjusting component 422 for controlling the up and down movement of the block 421; when in use, the adjusting component 422 controls the block 421 to move downward and engage with the serrations on the upper surface of the latch tooth 420, so that the slider 41 is fixed at any position of the slide rail 40.

[0087] The adjustment component 422 includes an adjustment rod 4220 connected to two sliders 41. The adjustment rod 4220 is a U-shaped structure. Both ends of the adjustment rod 4220 are also provided with arc structures. Both ends of the adjustment rod 4220 are connected with gears 4221. Each slider 41 is provided with a rack 4222 matching the gear 4221. The lower end of each rack 4222 passes through the slider 41 and is connected to a block 421. The middle parts of the two ends of the adjustment rod 4220 are elastically connected to the upper ends of the two sliders 41.

[0088] When in use, the outer end of the adjusting rod 4220 is lifted, so that the adjusting rod 4220 drives the gear 4221 to rotate, the gear 4221 drives the rack 4222 to rise, the rack 4222 drives the block 421 to rise, so that the block 421 is separated from the latching teeth 420, and the fixation between the two sliders 41 and the two slide rails 40 is cancelled, so that the slider 41 slides on the slide rail 40; after determining the stop position, the adjusting rod 4220 is released, and the adjusting rod 4220 automatically resets under the elastic action, the gear 4221 rotates in the opposite direction, the rack 4222 moves downward, and the block 421 is pushed to be re-stuck on the latching teeth 420, so that the slider 41 is fixed on the slide rail 40. It is convenient for the slider 41 to slide and lock on the slide rail 40.

[0089] The elastic connection between the middle parts of both ends of the adjusting rod 4220 and the two sliders 41 is a spring connection.

[0090] The specific use process of the present invention is as follows:

[0091] Select the appropriate type of U-shaped clamp 10 and finger sleeve 20 according to the finger size of the patient with bony mallet finger;

[0092] Put the fingertip of the bony mallet finger into the finger sleeve 20, and connect the fingertip and the finger sleeve 20 together with an adhesive layer;

[0093] Then put the finger and the finger sleeve 20 into the U-shaped clamp 10, and make the screw 21 pass through the through hole 12 of the U-shaped clamp 10 and contact the threaded ring 22;

[0094] The threaded ring 22 is rotated, and the threaded ring 22 pulls and stretches the finger sleeve 20 and the finger through the screw rod 21, so that the distal segment of the finger with bony mallet finger is straightened or slightly dorsiflexed;

[0095] After the adjustment is completed, the cover 23 is threadedly connected to the U-shaped clamp 10 to cover and protect the threaded ring 22;

[0096] According to the position of the fracture end shown on the X-ray film, determine the position where the positioning plate 43 needs to be moved;

[0097] 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 block 421 to rise, the block 421 is separated from the latching tooth 420, the fixation between the two sliders 41 and the two slide rails 40 is cancelled, and the slider 41 slides on the slide rails 40;

[0098] The positioning plate 43 is driven to translate on the opening of the U-shaped clip 10 by sliding the slider 41, so as to move the U-shaped clip 10 to the proximal end of the fracture end;

[0099] The adjusting rod 4220 is released, and the adjusting rod 4220 automatically resets under the action of elasticity, driving the gear 4221 to rotate in the opposite direction, so that the rack 4222 moves downward and pushes the block 421 to be re-engaged on the locking tooth 420, fixing the slider 41 on the slide rail 40, and then fixing the positioning plate 43 at the proximal end of the fracture end;

[0100] According to the position of the fracture end shown on the X-ray film, the insertion angle and position of the reduction needle 30 are selected, and the threaded hole 430 that coincides with the path of the reduction needle 30 is determined;

[0101] Screw the thread on the outer surface of the guide tube 311 into the selected threaded hole 430 to fix the cylinder 310 and the positioning plate 43;

[0102] Insert the reduction needle 30 into the cylinder 310, and insert the reduction portion 301 of the reduction needle 30 through the guide tube 311 into the fracture end and apply pressure;

[0103] After confirming that the fracture is well reduced and fixed through C-arm fluoroscopy, insert the gasket 314 to fill the remaining space, then connect the cover 313 to the cylinder 310, close the internal space of the cylinder 310, lock the reduction needle 30, and complete the operation.

[0104] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0105] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An external fixation device for treating bony mallet finger, characterized in that: include: A clamp (1), a traction mechanism (2), a navigation mechanism (3) and a positioning mechanism (4); The clamp (1) comprises a U-shaped clamp (10), the U-shaped clamp (10) comprises an upper plate and a lower plate, and is used to fix a bony mallet finger; the upper plate of the U-shaped clamp (10) is provided with an opening, and is used to expose a fractured part; The traction mechanism (2) is arranged at the bend inside the U-shaped clamp (10) and is used to pull the bony hammer finger; The positioning mechanism (4) is located above the opening of the U-shaped clip (10) and is used to adjust the resetting path of the external fixing needle; The navigation mechanism (3) cooperates with the positioning mechanism (4) to provide a moving path for the fixing needle.

2. The external fixation device for treating bony mallet finger according to claim 1, characterized in that: The clamp (1) further comprises a strap (11) for fixing the upper piece and the lower piece on the fingers, a perforation (12) is provided on the side wall of the U-shaped clamp (10), and long strip-shaped grooves (13) are provided on the facing sides of the upper piece and the lower piece.

3. The external fixation device for treating bony mallet finger according to claim 1, characterized in that: The traction mechanism (2) comprises a finger sleeve (20), a screw rod (21) and a threaded ring (22); The outer shape of the finger sleeve (20) is box-shaped and one end is open. The finger sleeve (20) is used to wrap 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) matches the screw rod (21).

4. The external fixation device for treating bony mallet finger according to claim 3, characterized in that: The finger sleeve (20) comprises an outer moving block (200) and an inner covering layer (201), wherein the inner covering layer (201) is located inside the outer moving block (200), an adhesive layer is provided on the inner top surface of the inner covering layer (201), and a plurality of semicircular protrusions (202) are provided on both the upper and lower outer surfaces of the outer moving block (200).

5. The external fixation device for treating bony mallet finger according to claim 3, characterized in that: The outer surface of the threaded ring (22) is provided with an anti-slip layer, and the outside of the threaded ring (22) is provided with a cover (23).

6. The external fixation device for treating bony mallet finger according to claim 1, characterized in that: 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 navigator (31) comprises a cylinder (310) and a cover (313); the bottom of the cylinder (310) is conical, a guide tube (311) is provided at the bottom of the cone, a thread is provided on the outer surface of the guide tube (311), and the cover (313) can cover the top of the cylinder (310); The reset needle (30) can be just inserted into the navigator (31), and the reset portion (301) of the reset needle (30) can pass through the guide tube (311).

7. The external fixation device for treating bony mallet finger according to claim 6, characterized in that: The diameter of the handle portion (300) is greater than the diameter of the reset portion (301), and a flange (302) is provided on the edge of the handle portion (300); Several layers of gaskets (314) are arranged inside the cylinder (310), and all of the gaskets (314) are located between the sealing cover (313) and the handle portion (300).

8. The external fixation device for treating bony mallet finger according to claim 6, characterized in that: An extraction ring (316) is provided inside the cylinder (310), and both sides of the extraction ring (316) extend outward to form lifting blocks (317), and the other ends of the two lifting blocks (317) are rotatably connected to the same U-shaped pull ring (318).

9. The external fixation device for treating bony mallet finger according to claim 1, characterized in that: The positioning mechanism (4) comprises two slide rails (40), two slide blocks (41), a positioning plate (43) and a skid stopper (42); The two slide rails (40) are in an elongated structure as a whole. Each of the slide rails (40) is provided with a slider (41). Each of the sliders (41) can slide on the corresponding slide rail (40). The positioning plate (43) is arranged between the two sliders (41). When the sliders (41) stop moving, the anti-slip device (42) can simultaneously lock the two sliders (41) on the two corresponding slide rails (40). The longitudinal section of the positioning plate (43) is semicircular, and a plurality of threaded holes (430) are provided on the positioning plate (43).

10. The external fixation device for treating bony mallet finger according to claim 9, characterized in that: The anti-slip device (42) comprises a latching tooth (420), a slide groove is provided in the middle of the slide rail (40), the latching tooth (420) is arranged inside the slide groove, a block (421) matching the latching tooth (420) is provided at the bottom of each slider (41), and an adjustment component (422) is connected to the upper end of the latching tooth (420) for controlling the block (421) to move up and down; The adjustment component (422) comprises an adjustment rod (4220) connected to two sliders (41); both ends of the adjustment rod (4220) are connected to gears (4221); each slider (41) is provided with a rack (4222) matching the gear (4221); the lower end of each rack (4222) penetrates the slider (41) and is connected to a block (421); and the middle parts of both ends of the adjustment rod (4220) are elastically connected to the upper ends of the two sliders (41).

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