Bone hammer-shaped positioning instrument

Abstract

The utility model provides a bony hammer-shaped finger positioning instrument. The bony hammer-shaped finger positioning instrument comprises two sliding rails, two sliding blocks, a positioning plate and a slip stopper, the two sliding rails are integrally of a long-strip-shaped structure, each sliding rail is provided with a sliding block, each sliding block can slide on the corresponding sliding rail, and the positioning plate is arranged between the two sliding blocks. The position where the positioning plate needs to be moved is determined according to the position of the fracture end displayed by X-ray radiography; the middle of the adjusting rod is lifted, so that the adjusting rod drives the gear to rotate, the gear drives the rack to ascend, the rack drives the clamping block to ascend, the clamping block is separated from the clamping teeth, fixation between the two sliding blocks and the two sliding rails is omitted, the sliding blocks slide on the sliding rails, and therefore the U-shaped clamp is moved to the near end of the fracture end, and the adjusting rod is loosened; under the elastic action, the adjusting rod automatically resets, then the positioning plate is fixed to the near end of the fracture end, and the effect of conveniently adjusting the reset path of the fixing needle is achieved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a bony hammer-shaped positioning device. Background Technology

[0002] Bony hammer finger is a condition in which the extensor tendon of the distal phalanx of the finger is avulsed and fractured when it is struck by an external force while in an extended position, resulting in the fingertip being unable to fully straighten and resembling a hammer.

[0003] Bony mallet finger is clinically common. Conservative treatment is often limited by the lack of effective external fixators for reduction and fixation of the fracture, so surgical treatment is currently the preferred approach. Existing surgical techniques for bony mallet finger include the Ishiguro method, the wire insertion method, and the double Kirschner wire elastic compression method. While these methods have achieved good results, they all have the following drawbacks: ① high surgical costs; ② significant surgical trauma; ③ postoperative risks of skin necrosis and incision infection. To avoid these drawbacks, we have designed an external fixator that can effectively treat the condition while avoiding surgery. In non-surgical treatment, a locking mechanism is needed to lock the fixation pins. However, the position of the fixation pins is not fixed, so the locking mechanism needs to be movable and positioned on the clamp used to hold the bony mallet finger.

[0004] To address this issue, we propose a bony hammer-shaped positioning device to solve the problem that locking mechanisms cannot coordinate with fracture ends for position adjustment during non-surgical treatment. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a bony hammer-shaped positioning device to solve the problem that the locking mechanism cannot cooperate with the fracture ends for position adjustment during non-surgical treatment.

[0006] To achieve the above and other related objectives, this utility model provides a bony hammer-shaped positioning device, comprising: two slide rails, two sliders, a positioning plate, and an anti-slip device;

[0007] The two slide rails are in the shape of long strips, and each slide rail is equipped with a slider. Each slider can slide on the corresponding slide rail. The positioning plate is located between the two sliders. When the sliders stop moving, the anti-slip device can lock the two sliders onto the two corresponding slide rails at the same time.

[0008] Preferably, the length of the two slide rails is greater than the length of the long side of the opening of the external clamp.

[0009] Preferably, the anti-slip device includes a locking tooth, the slide rail has a slide groove in the middle, the locking tooth is located inside the slide groove, the bottom of each slider is provided with a locking block that matches the locking tooth, and the upper end of the locking tooth is connected to an adjustment component for controlling the up and down movement of the locking block.

[0010] Preferably, the lower end of each slider is higher than the uppermost end of the corresponding tooth, and the lower end of each slider is provided with a slot corresponding to the card block.

[0011] Preferably, the adjusting assembly includes an adjusting rod connected to two sliders, with gears connected to both ends of the adjusting rod. Each slider has a rack that matches the gear, and the lower end of each rack passes through the slider and is connected to a locking block. The middle of both ends of the adjusting rod is elastically connected to the upper ends of the two sliders.

[0012] Preferably, the adjusting rod has a U-shaped structure, and both ends of the adjusting rod are designed with arc-shaped structures.

[0013] Preferably, the elastic connection between the adjusting rod and the two sliders is a spring connection.

[0014] Preferably, the positioning plate has a semi-circular longitudinal section and is provided with a plurality of threaded holes.

[0015] Preferably, all the threaded holes are arranged in several rows and are evenly arranged horizontally. Each row of threaded holes is arranged in a vertical circumferential array around the positioning plate and all penetrate the positioning plate.

[0016] As described above, the bony hammer-shaped positioning device disclosed in this utility model has the following beneficial effects: This utility model determines the position to be moved of the positioning plate based on the position of the fracture end shown in the X-ray; by lifting the middle part of the adjusting rod, the adjusting rod drives the gear to rotate, the gear drives the rack to rise, the rack drives the locking block to rise, so that the locking block separates from the locking teeth, the fixation between the two sliders and the two slide rails is eliminated, and the sliders slide on the slide rails, thereby moving the U-shaped clamp to the proximal end of the fracture end. The adjusting rod is released, and under the action of elasticity, the adjusting rod automatically resets, thereby fixing the positioning plate to the proximal end of the fracture end, achieving the effect of convenient adjustment of the reduction path of the fixation pin.

[0017] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. Attached Figure Description

[0018] Figure 1 The image shown is a perspective view of an external fixation device for treating bony hammer finger according to this invention.

[0019] Figure 2 The image shown is a perspective view of a clamp for external fixation device used to treat bony hammer finger according to this utility model.

[0020] Figure 3 The image shown is a perspective view of the traction mechanism of an external fixation device for treating bony hammer finger according to this utility model.

[0021] Figure 4 The diagram shown is an exploded view of the traction mechanism of an external fixation device for treating bony hammer finger according to this invention.

[0022] Figure 5 The diagram shown is a connection structure diagram of the finger sleeve of an external fixation device for treating bony hammer finger according to this utility model.

[0023] Figure 6 The image shown is a perspective view of the navigation mechanism of an external fixation device for treating bony hammer finger according to this utility model.

[0024] Figure 7 The image shown is a sectional perspective view of the navigation mechanism of an external fixation device for treating bony hammer finger according to this utility model.

[0025] Figure 8 This invention relates to an external fixation device for treating bony mallet finger. Figure 7 Enlarged view of section A in the middle.

[0026] Figure 9 This invention relates to an external fixation device for treating bony mallet finger. Figure 7 Enlarged view of section B.

[0027] Figure 10 The image shown is a perspective view of a navigator for an external fixation device used to treat bony hammer finger according to this utility model.

[0028] Figure 11 The image shown is a perspective view of the repositioning pin of an external fixation device for treating bony hammer finger according to this utility model.

[0029] Figure 12 The image shown is a perspective view of the positioning mechanism of an external fixation device for treating bony hammer finger according to this utility model.

[0030] Figure 13 The image shown is a perspective view of the positioning plate of an external fixation device for treating bony hammer finger according to this utility model.

[0031] Figure 14 The image shown is a three-dimensional sectional view of the positioning plate of an external fixation device for treating bony hammer finger according to this utility model.

[0032] Figure 15 The image shown is a perspective view of an antislip device for external fixation of bony hammer finger according to this utility model.

[0033] Figure 16 The diagram shown is of a slider connection mechanism for an external fixation device for treating bony hammer finger according to this utility model.

[0034] Figure 17 The image shown is a three-dimensional sectional view of a slider in an external fixation device for treating bony hammer finger according to this invention.

[0035] Component designation explanation

[0036] 1. Fixture; 2. Traction mechanism; 3. Navigation mechanism; 4. Positioning mechanism;

[0037] 10. U-shaped clip; 11. Strap; 12. Perforation; 13. Groove;

[0038] 20. Finger cot; 21. Screw; 22. Threaded ring; 23. Cap;

[0039] 200. Outer moving block; 201. Inner covering layer; 202. Semi-circular protrusion;

[0040] 30. Reset pin; 31. Navigator;

[0041] 300. Handle portion; 301. Reset portion; 302. Flange;

[0042] 310. Cylinder body; 311. Guide tube; 313. Cap; 314. Gasket; 315. Transparent window; 316. Extraction ring; 317. Lifting block; 318. Pull ring;

[0043] 40. Slide rail; 41. Slider; 42. Anti-slip device; 43. Positioning plate;

[0044] 420. Clamping teeth; 421. Clamping block; 422. Adjustment component;

[0045] 4220. Adjusting rod; 4221. Gear; 4222. Rack;

[0046] 430. Threaded hole. Detailed Implementation

[0047] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0048] Please see Figures 1 to 17It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0049] We have designed a complete set of medical devices for the conservative treatment of bony mallet finger.

[0050] like Figure 1-17 As shown, it includes: clamp 1, traction mechanism 2, navigation mechanism 3 and positioning mechanism 4.

[0051] The clamp 1 includes a U-shaped clamp 10, which is made of aluminum plate. The U-shaped clamp 10 includes an upper piece and a lower piece for fixing the bony mallet finger. Soft pads can be added to the opposing sides of the upper and lower pieces to enhance comfort. The U-shaped clamp 10 is integrally molded, with a bend at the connection between the upper and lower pieces. The upper piece of the U-shaped clamp 10 has an opening to expose the fracture site. The traction mechanism 2 is located at the bend inside the U-shaped clamp 10 for traction of the bony mallet finger. The positioning mechanism 4 is located above the opening of the U-shaped clamp 10 for adjusting the reduction path of the external fixation pin. The navigation mechanism 3 cooperates with the positioning mechanism 4 to provide a travel path for the fixation pin.

[0052] In use, the bony hammer finger is fixed by the U-shaped clamp 10, and the finger is pulled by the traction mechanism 2 to straighten or slightly dorsiflex the distal phalanx. Then, according to the position of the fracture end shown by the X-ray, the positioning mechanism 4 and the navigation mechanism 3 are coordinated to adjust the insertion point of the fixation pin. After the fixation pin is inserted into the fracture end and the fracture end is reduced and compressed, the navigation mechanism 3 and the positioning mechanism 4 are coordinated to lock the fixation pin.

[0053] It should be noted that since everyone's finger size is different, when the U-shaped clip 10 is widely used, multiple different sizes should be provided to accommodate the use of most patients with bony mallet finger.

[0054] In one embodiment, the clamp 1 further includes a strap 11 for securing the upper and lower pieces to the finger, thereby clamping and fixing the finger. The side wall of the U-shaped clamp 10 is provided with a through hole 12, which provides space for the movement of the traction mechanism 2. Both the upper and lower pieces have elongated grooves 13 on their opposing sides.

[0055] In one embodiment, the traction mechanism 2 includes a finger sleeve 20, a screw 21, and a threaded ring 22. The finger sleeve 20 has a box-shaped outer shape with one end open, and is used to wrap the fingertip. The left side wall of the finger sleeve 20 is connected to one end of the screw 21, and the threaded ring 22 matches the screw 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 internal 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, and the upper and lower surfaces of the finger sleeve 20 contact the inner top and inner bottom surfaces of the U-shaped clamp 10, respectively, to prevent the finger sleeve 20 from deflecting with the screw 21 when the screw 21 is pulled. When using it, the fingertip of the bony hammer finger is wrapped with the finger sleeve 20 and placed inside the U-shaped clip 10 near the bend. The screw 21 passes through the through hole 12 of the U-shaped clip 10 and contacts the threaded ring 22. The threaded ring 22 is rotated, and the screw 21 is pulled to the left through the threaded structure. The screw 21 pulls the finger through the finger sleeve 20, so that the distal phalanx of the finger is straightened or slightly dorsiflexed, which facilitates recovery and treatment.

[0056] In one embodiment, the finger sleeve 20 includes an outer moving block 200 and an inner covering layer 201, with the inner covering layer 201 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 conjunction with the screw 21, and is made of a harder material such as plastic to improve structural stability; the inner covering layer 201 is used to wrap and pull the fingertip, and is mainly made of a softer material such as rubber to improve comfort. The inner covering layer 201 and the outer moving block 200 are glued together using the hook and loop sides of Velcro, making it easy to separate. When using the same type of clamp 1, only the inner covering layer 201 needs to be replaced for reuse, saving materials, making it convenient to use, and practical. The inner top surface of the inner covering layer 201 is provided with an adhesive layer to bond the fingertip to the inner covering layer 201, strengthening the connection between the finger and the inner covering layer 201 and facilitating pulling. The adhesive layer uses a washable adhesive that is harmless or minimally harmful to the human body, allowing the inner covering layer 201 to be easily removed by washing, making removal of the inner covering layer 201 more convenient. The upper and lower outer surfaces of the outer moving block 200 are provided with multiple semi-circular protrusions 202. The semi-circular protrusions 202 match the grooves 13 inside the U-shaped clip 10 to limit the traction direction and prevent the finger sleeve 20 from shifting at an angle during traction, thus avoiding difficulty in traction.

[0057] In one embodiment, the outer surface of the threaded ring 22 is provided with an anti-slip layer to enhance the friction between the hand and the threaded ring 22 and prevent the hand from slipping when rotating the threaded ring 22. The threaded ring 22 is provided with a cover 23, which is threadedly connected to the outer wall of the U-shaped clip 10. The cover 23 is used to cover the threaded ring 22 and the screw 21 extending from the outer wall of the U-shaped clip 10, so as to prevent the threaded ring 22 from driving the screw 21 to rotate when accidentally touched, thereby changing the magnitude of the traction force on the bony hammer finger and affecting the traction effect on the finger.

[0058] In one embodiment, the navigation mechanism 3 includes a reset needle 30 and a navigator 31; the reset needle 30 includes a handle portion 300 and a reset portion 301; the handle portion 300 has symmetrical inward recesses on both sides to form hand-held grooves for holding, and the reset portion 301 is used to insert into the fracture end and apply pressure and reset the fracture end.

[0059] The navigator 31 includes a cylindrical body 310 and a cover 313. The bottom of the cylindrical body 310 is conical, and a guide tube 311 is provided at the bottom of the conical shape. The outer surface of the guide tube 311 is threaded. The cover 313 can cover the top of the cylindrical body 310. The reset pin 30 can be inserted into the navigator 31, and the reset part 301 of the reset pin 30 can pass through the guide tube 311.

[0060] In one embodiment, the diameter of the handle portion 300 is larger than the diameter of the reset portion 301, which is beneficial for handheld use. The handle portion 300 has a flange 302 on its edge; the flange 302 at the tail of the handle portion 300 can fit perfectly into the inside of the cylinder 310, making it convenient for the cap 313 to seal the reset needle 30.

[0061] The navigator also includes several layers of pads 314, all of which are located between the cap 313 and the handle portion 300. The pads 314 compensate for the gap between the handle portion 300 and the cap 313, preventing the reduction pin 30 from loosening during compression reduction of the fracture ends, which could result in insufficient pressure on the fracture ends and affect the recovery and treatment of bony mallet finger. Furthermore, when the pressure applied by the reduction pin 30 to the fracture ends is low, the number of pads 314 can be increased to advance the reduction pin 30 and provide sufficient pressure on the fracture ends.

[0062] It should be noted that the reset pin 30 is the same object as the fixing pin described above, and will be referred to as reset pin 30 in the following text.

[0063] In one embodiment, the interior of the cylinder 310 is provided with an extraction ring 316. The inner diameter of the extraction ring 316 is larger than the diameter of the handle portion 300 and smaller than the diameter of the flange 302. The extraction ring 316 is located below the reset needle 30. Both sides of the extraction ring 316 extend outward to form lifting blocks 317. Both lifting blocks 317 penetrate the cylinder 310, and both sides of the cylinder 310 are provided with lifting grooves corresponding to the lifting blocks 317. The lifting blocks 317 slide up and down within the lifting grooves. The other ends of both lifting blocks 317 are rotatably connected to the same U-shaped pull ring 318, which is located outside the cylinder 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 cylinder 310 via the lifting blocks 317. During the rise, the extraction ring 316 contacts the flange 302 of the reset needle 30 and drives the entire reset needle 30 to rise, removing the reset needle 30 from the cylinder 310.

[0064] The side wall of the cylinder 310 is also provided with a vertical transparent window 315, which is marked with a scale. The position of the reset pin 30 inside the cylinder 310 can be observed through the transparent window 315, making it convenient to adjust the reset pin 30 up and down according to the scale.

[0065] In one embodiment, the positioning mechanism 4 includes two slide rails 40, two sliders 41, a positioning plate 43, and an anti-slip device 42;

[0066] The two slide rails 40 are elongated in shape, and each slide rail 40 has a slider 41. Each slider 41 can slide on its corresponding slide rail 40. The positioning plate 43 is located between the two sliders 41. When the sliders 41 stop moving, the anti-slip device 42 can simultaneously lock the two sliders 41 onto their respective slide rails 40. The positioning plate 43 has a semi-circular longitudinal section and is provided with several threaded holes 430. All the 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 to the threaded holes 430 through the external thread of the guide tube 311, fixing the cylinder 310 on the positioning plate 43. This, together with the cover 313 and the gasket 314, locks the reset pin 30.

[0067] When in use, according to the position of the fracture end shown on the X-ray, slide the slider 41. The slider 41 drives the positioning plate 43 to move to the proximal end of the fracture end. The anti-slip device 42 locks the slider 41, 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.

[0068] In one embodiment, the anti-slip device 42 includes a locking tooth 420. A groove is provided in the middle of the slide rail 40, and the locking tooth 420 is located inside the groove. Each slider 41 has a locking block 421 at its bottom that matches the locking tooth 420. An adjustment component 422 is connected to the upper end of the locking tooth 420 to control the locking block 421 to move up and down. In use, the locking block 421 is controlled to move down by the adjustment component 422 to engage with the serrations on the upper surface of the locking tooth 420, so that the slider 41 is fixed at any position on the slide rail 40.

[0069] The adjustment assembly 422 includes an adjustment rod 4220 connected to two sliders 41. The adjustment rod 4220 has a U-shaped structure and arc-shaped structures at both ends. Gears 4221 are connected to both ends of the adjustment rod 4220. Each slider 41 has a rack 4222 that matches the gear 4221. The lower end of each rack 4222 passes through the slider 41 and is connected to a locking block 421. The middle of both ends of the adjustment rod 4220 is elastically connected to the upper ends of the two sliders 41.

[0070] In use, by lifting the outer end of the adjusting rod 4220, the adjusting rod 4220 drives the gear 4221 to rotate. The gear 4221 drives the rack 4222 to rise, and the rack 4222 drives the locking block 421 to rise, causing the locking block 421 to separate from the locking tooth 420. This removes the fixation between the two sliders 41 and the two slide rails 40, allowing the sliders 41 to slide on the slide rails 40. After determining the stopping position, the adjusting rod 4220 is released. Under the action of elasticity, the adjusting rod 4220 automatically resets, the gear 4221 rotates in the opposite direction, and the rack 4222 moves downward, pushing the locking block 421 to re-lock onto the locking tooth 420, fixing the sliders 41 onto the slide rails 40. This facilitates the sliding and locking of the sliders 41 on the slide rails 40.

[0071] The elastic connection between the middle of both ends of the adjusting rod 4220 and the two sliders 41 is a spring connection.

[0072] The specific usage process of this utility model is as follows:

[0073] Select the appropriate size of U-shaped clip 10 and finger sleeve 20 according to the size of the patient's bony hammer finger;

[0074] Place the fingertip of the bony hammer finger into the finger sleeve 20, and use an adhesive layer to connect the fingertip to the finger sleeve 20;

[0075] Next, place the fingers and finger cots 20 into the U-shaped clip 10, and make the screw 21 pass through the through hole 12 of the U-shaped clip 10 and contact the threaded ring 22;

[0076] Rotate the threaded ring 22, and the threaded ring 22 will pull and stretch the finger sleeve 20 and the finger through the screw 21, so that the distal phalanx of the bony hammer finger is straightened or slightly dorsiflexed.

[0077] After adjustment, connect the cover 23 to the U-shaped clamp 10 by thread to cover and protect the threaded ring 22;

[0078] Based on the position of the fracture ends shown in the X-ray images, determine the position where the positioning plate 43 needs to be moved;

[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 locking block 421 to rise, so that the locking block 421 separates from the locking tooth 420, and the fixation between the two sliders 41 and the two slide rails 40 is removed, so that the sliders 41 slide on the slide rails 40.

[0080] By sliding the slider 41, the positioning plate 43 is moved across the opening of the U-shaped clamp 10, and the U-shaped clamp 10 is moved to the proximal end of the fracture.

[0081] Release the adjusting rod 4220. Under the elastic action, the adjusting rod 4220 automatically resets, driving the gear 4221 to rotate in the opposite direction, causing the rack 4222 to move downward and push the locking block 421 to re-lock onto the locking tooth 420, fixing the slider 41 onto the slide rail 40, and then fixing the positioning plate 43 to the proximal end of the fracture.

[0082] Based on the location of the fracture ends shown in the X-ray, the insertion angle and position of the reduction pin 30 are selected, and the threaded hole 430 that coincides with the path of the reduction pin 30 is determined.

[0083] Screw the guide tube 311 into the selected threaded hole 430 to fix the cylinder 310 to the positioning plate 43.

[0084] Insert the reduction needle 30 into the cylinder 310, so that the reduction part 301 of the reduction needle 30 passes through the guide tube 311 and is inserted into the fracture end and pressure is applied;

[0085] After confirming that the fracture reduction and fixation are good using C-arm fluoroscopy, a shim 314 is placed to fill the remaining space. Then, the cap 313 is connected to the cylinder 310 to close the internal space of the cylinder 310 and lock the reduction needle 30, thus completing the operation.

[0086] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A bony hammer-shaped positioning instrument, characterized in that, include: Two slide rails (40), two sliders (41), a positioning plate (43), and an anti-slip device (42); The two slide rails (40) are in the shape of a long strip. 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 located between the two sliders (41). When the slider (41) stops moving, the anti-slip device (42) can lock the two sliders (41) on the two corresponding slide rails (40) at the same time.

2. The bony hammer-shaped positioning device according to claim 1, characterized in that: The lengths of the two slide rails (40) are greater than the length of the long side at the opening of the external clamp.

3. The bony hammer-shaped positioning device according to claim 1, characterized in that: The anti-slip device (42) includes a locking tooth (420), and the slide rail (40) has a slide groove in the middle. The locking tooth (420) is located inside the slide groove. Each slider (41) has a locking block (421) at its bottom that matches the locking tooth (420). The upper end of the locking tooth (420) is connected to an adjustment component (422) for controlling the up and down movement of the locking block (421).

4. The bony hammer-shaped positioning device according to claim 3, characterized in that: The lower end of each slider (41) is higher than the uppermost end of the corresponding tooth (420), and the lower end of each slider (41) is provided with a slot corresponding to the tooth (421).

5. The bony hammer-shaped positioning device according to claim 3, characterized in that: The adjustment assembly (422) includes 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) that matches the gear (4221). The lower end of each rack (4222) passes through the slider (41) and is connected to a locking block (421). The middle of both ends of the adjustment rod (4220) is elastically connected to the upper ends of the two sliders (41).

6. The bony hammer-shaped positioning device according to claim 5, characterized in that: The adjusting rod (4220) has a U-shaped structure, and both ends of the adjusting rod (4220) are set as arc-shaped structures.

7. A bony hammer-shaped positioning device according to claim 5 or 6, characterized in that: The elastic connection between the adjusting rod (4220) and the two sliders (41) is a spring connection.

8. The bony hammer-shaped positioning device according to claim 1, characterized in that: The positioning plate (43) has a semi-circular longitudinal section and is provided with several threaded holes (430).

9. A bony hammer-shaped positioning device according to claim 8, characterized in that: All the threaded holes (430) are arranged in several rows and are evenly arranged horizontally. Each row of threaded holes (430) is arranged in a vertical circumferential array around the positioning plate (43) and all penetrate the positioning plate (43).

Images