Reduction forceps for metacarpal bone comminuted fracture

Abstract

The invention relates to the technical field of fracture reduction forceps, in particular to reduction forceps for metacarpal bone comminuted fracture, which comprise a forceps handle I and a forceps handle II, a rotating shaft is mounted at the intersection of the forceps handle I and the forceps handle II, limiting blocks are mounted on the inner sides of the upper ends of the forceps handle I and the forceps handle II, an elastic piece is mounted between the two limiting blocks, and the elastic piece is connected with the rotating shaft. A guide frame is installed on the first plier handle, a fixed plier head is installed at the lower end of the first plier handle, and an adjustable plier head is fixedly installed at the lower end of the second plier handle. The precise adjusting mechanism composed of the telescopic shaft, the ball head unit and the multiple tong head units is arranged in the adjustable tong head, so that a doctor can conduct synchronous or respective precise angle adjustment on the multiple tong head units according to spatial distribution of metacarpal bone comminuted fracture blocks; by means of the mechanical arm, multiple clamping points can be derived from one entry point, multiple bone blocks in different planes and at different angles can be synchronously clamped, the three-dimensional structure of the metacarpal bone is effectively recovered, and the mechanical arm is suitable for complex comminuted fractures.

Description

Technical Field

[0001] This application relates to the field of fracture reduction clamp technology, and in particular to a reduction clamp for comminuted metacarpal fractures. Background Technology

[0002] Metacarpal fractures are among the most common injuries in hand surgery. Comminuted fractures, in particular, are challenging to treat due to the involvement of multiple fracture fragments, bone defects, and articular surface collapse. The ideal treatment goal is to restore the anatomical length, axial alignment, and smoothness of the articular surfaces of the metacarpals, thereby preserving hand function to the greatest extent possible.

[0003] In the prior art, CN217593037U provides a fracture reduction device that can stably clamp at multiple points. Specifically, clamping blocks are respectively set opposite to the heads of the first and second clamping handles as the first point for stably clamping the fracture. Then, a pressure block, which is adjusted by an adjusting device to press the steel plate covering the fracture, is movably installed on the clamping blocks as the second point for stably clamping the steel plate and the fracture. The clamping blocks and the pressure block are used together to stably clamp the fracture and the steel plate at multiple points, so that the broken bone and the steel plate will not loosen or shift during the operation. This helps to maintain the fracture reduction and the position of the steel plate, and provides convenience for the surgeon to drill holes and screw in screws stably and precisely, and then fix the fracture with the steel plate.

[0004] The existing technology in the aforementioned patent has the following drawbacks when in use: the bone fragments in comminuted metacarpal fractures are often located in different spatial planes, and the fracture line direction is variable. The existing reduction forceps have a fixed angle of the forceps head and cannot be adjusted in multiple dimensions according to the fracture morphology. This often forces doctors to perform excessive soft tissue dissection to adapt to the instrument, or to be unable to effectively clamp multiple major bone fragments at the same time, resulting in poor reduction effect. Moreover, for comminuted fractures with multiple planes and multiple bone fragments, doctors often need to make repeated adjustments and clamp multiple times to complete the initial reduction, which is cumbersome and prolongs the operation time. In addition, after reduction, doctors need to hold the forceps handle tightly to maintain the position, which not only consumes the doctor's physical strength, but may also lead to a decrease in reduction quality due to fatigue, affecting the accuracy of subsequent placement of internal fixation devices such as screws and mini-plates.

[0005] To address the aforementioned problems, this invention proposes a reduction clamp for comminuted metacarpal fractures, which is capable of multi-dimensional and multi-point adjustment and has adaptive clamping capability. Summary of the Invention

[0006] To address the problems existing in the background art, the present invention proposes a reduction clamp for comminuted metacarpal fractures.

[0007] The reduction clamp for comminuted metacarpal fractures provided in this application adopts the following technical solution: A reduction forceps for comminuted metacarpal fractures includes: a first forceps handle and a second forceps handle, which are arranged crosswise. A pivot is installed at the intersection of the first and second forceps handles. Limiting blocks are installed on the inner sides of the upper ends of the first and second forceps handles. An elastic element is installed between the two limiting blocks. A guide frame is installed on the first forceps handle, and an arc-shaped groove is formed in the middle of the guide frame. A locking screw is fixedly installed on the second forceps handle, which is located inside the arc-shaped groove. A fixed forceps head is installed at the lower end of the first forceps handle, and an adjustable forceps head is fixedly installed at the lower end of the second forceps handle.

[0008] Furthermore, the fixing clamp head has a hook-shaped structure, the surface of the fixing clamp head has a blunt micro-tooth structure, and the inner layer of the fixing clamp head is a layer of elastic medical-grade silicone or shape memory alloy micro-spring pad.

[0009] Furthermore, the adjustable pliers head includes a connecting seat, a locking frame, a telescopic shaft, a locking unit, a ball head unit, and pliers head units. The connecting seat is fixedly installed at the lower end of the two pliers handles. The connecting seat has a hollow structure in the middle and an arc-shaped groove at the front end of the connecting seat, which is connected to the interior of the connecting seat. Locking frames are symmetrically installed at the left and right ends of the connecting seat. A telescopic shaft is installed inside the connecting seat through a bearing. Locking units are symmetrically installed on the telescopic shaft, and the locking units are locked in place with the locking frames. Ball head units are symmetrically installed at the ends of the telescopic shaft. There are three pliers head units. One pliers head unit passes through the arc-shaped groove and connects to the middle of the telescopic shaft. The remaining pliers head units are connected to the ball head units. Simultaneously, pulling two ball head units outwards separates and unlocks the locking unit from the locking frame, so as to adjust the angle of the pliers head units.

[0010] Furthermore, the locking frame has a circular structure, and locking teeth are evenly arranged on the outer surface of the locking frame.

[0011] Furthermore, the telescopic shaft includes a fixed end, a telescopic end, and a plug-in bracket. The fixed end is installed inside the connecting seat through a bearing. The telescopic ends are symmetrically arranged on both sides of the fixed end. A sliding groove is provided on the telescopic end. A plug-in bracket that mates with the sliding groove is installed on the fixed end. The plug-in bracket has a regular polygonal structure.

[0012] Furthermore, the locking unit includes a snap-fit ​​bracket fixedly installed on the telescopic end. The snap-fit ​​bracket has a circular structure and is evenly provided with locking grooves that cooperate with locking teeth. It also includes an end cap sleeved on the telescopic end. The end cap is installed on the side wall of the connecting seat by screws. A telescopic spring is also sleeved on the telescopic end located between the snap-fit ​​bracket and the end cap.

[0013] Furthermore, the ball head unit includes a ball head and a rotating sleeve. The ball head is fixedly installed on the outside of the telescopic end, and the rotating sleeve is rotatably mounted on the ball head. The gap between the rotating sleeve and the ball head is filled with magnetorheological fluid.

[0014] Furthermore, a protective sleeve is provided between the end cap and the rotating sleeve. The protective sleeve is retractable and is used to seal the gap between the rotating sleeve and the end cap.

[0015] Furthermore, the clamp head unit includes a clamp frame and three plug rods. One plug rod passes through the arc-shaped groove and is installed on the fixed end, while the remaining plug rods are fixedly installed on the rotating sleeve. The plug rods are equipped with retractable positioning protrusions, and the clamp frame is installed on the plug rods. The clamp frame is replaceable, and the end of the clamp frame is provided with a positioning hole that mates with the plug rod. The slot is provided with a positioning hole that mates with the positioning protrusion.

[0016] Beneficial effects Compared with the prior art, the present invention provides a reduction clamp for comminuted metacarpal fractures, which has the following beneficial effects: 1. In this invention, by setting a precision adjustment mechanism consisting of a telescopic shaft, a ball head unit, and multiple clamp head units inside the adjustable clamp head, the doctor can make precise angle adjustments to multiple clamp head units simultaneously or separately according to the spatial distribution of the metacarpal comminuted fracture fragments. This allows the instrument to generate multiple clamping points from one entry point, realizing "encircling" or "multi-point" synchronous clamping of multiple bone fragments at different planes and angles, effectively restoring the three-dimensional structure of the metacarpal, and is especially suitable for treating complex comminuted fractures that are difficult to handle with traditional instruments.

[0017] 2. In this invention, the elastic pad inside the fixed clamp head and the multi-point independent design of the adjustable clamp head together constitute an adaptive clamping system. When the clamp head contacts an uneven bone surface, the elastic pad will undergo slight deformation, so that the pressure is evenly distributed, changing from a dangerous "point contact" to a safe "surface contact", reducing the risk of crushing bone fragments due to stress concentration, which is particularly beneficial to patients with osteoporosis.

[0018] 3. In this invention, the toothed meshing design of the locking unit and the locking frame, combined with the telescopic spring, provides a mechanism for quick unlocking and stable locking. Doctors can complete the coarse adjustment and locking of the angle through a simple "pull out-adjust-release" action, which is intuitive and efficient.

[0019] 4. In this invention, magnetorheological fluid technology is used in the ball head unit to realize instantaneous and stepless switching between the free adjustment state and the rigid locking state of the clamp head unit. This allows doctors to fine-tune individual clamp heads while the main structure is locked, and ensures absolute stability during clamping to prevent shaking, thereby enabling the clamping of bone blocks in different planes. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of this application.

[0022] Figure 2 This is a three-dimensional structural diagram of the adjustable pliers head of this application.

[0023] Figure 3 This is a three-dimensional cross-sectional structural diagram of the adjustable pliers head of this application.

[0024] Figure 4 This is a three-dimensional structural diagram of the connector, locking bracket and connector rod of this application.

[0025] Figure 5 This is a three-dimensional structural diagram of the telescopic shaft, ball head, and plug-in rod of this application.

[0026] Figure 6 This is an exploded view of the locking unit of this application.

[0027] Figure 7 This is an exploded view of the ball head unit, the clamp head unit, and the clamp head unit in this application.

[0028] Explanation of reference numerals in the attached diagram: 1. Pliers handle one; 11. Limiting block; 12. Elastic element; 13. Guide frame; 14. Locking screw; 2. Pliers handle two; 3. Rotating shaft; 4. Fixed pliers head; 5. Adjustable pliers head; 51. Connecting seat; 52. Locking frame; 53. Telescopic shaft; 531. Fixed end; 532. Telescopic end; 533. Insertion frame; 54. Locking unit; 541. Snap-fit ​​frame; 542. End cap; 543. Telescopic spring; 55. Ball head unit; 551. Ball head; 552. Rotating sleeve; 56. Pliers head unit; 561. Pliers clamp frame; 562. Insertion rod; 57. Pliers head unit. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1-7The present invention provides a reduction forceps for comminuted metacarpal fractures, comprising: a first forceps 1 and a second forceps 2, the first forceps 1 and the second forceps 2 being arranged crosswise, a rotating shaft 3 being installed at the intersection of the first forceps 1 and the second forceps 2, a limiting block 11 being installed on the inner side of the upper end of the first forceps 1 and the second forceps 2, an elastic element 12 being installed between the two limiting blocks 11, a guide frame 13 being installed on the first forceps 1, an arc-shaped sliding groove being opened in the middle of the guide frame 13, a locking screw 14 being fixedly installed on the second forceps 2, the locking screw 14 being located inside the arc-shaped sliding groove, a fixed forceps head 4 being installed at the lower end of the first forceps 1, and an adjustable forceps head 5 being fixedly installed at the lower end of the second forceps 2.

[0031] In the above technical solution, the angle of the adjustable clamp head 5 is adjustable. According to the direction of the metacarpal fracture line and the spatial position of the bone fragment, the doctor adjusts the two clamp heads to the optimal clamping angle. By holding the ends of the clamp handle 1 and clamp handle 2, the fixed clamp head 4 is placed at the bottom of the patient's metacarpal and supports the metacarpal. The adjustable clamp head 5 is pressed down by the clamp handle 2, so that the adjustable clamp head 5 can press down on the fracture site of the metacarpal. The clamp handle 1 and clamp handle 2 can be locked by the locking screw 14, thereby applying a continuous and stable elastic pressure to the fracture end. The doctor does not need to hold the clamp handle tightly all the time, which provides a stable temporary fixation environment for the doctor to perform subsequent internal fixation operations (such as screwing in screws and placing mini-plates). See Figure 1 As shown, in this preferred embodiment, the fixing clamp head 4 has a hook-shaped structure, the surface of the fixing clamp head 4 is a blunt micro-tooth structure, and the inner layer of the fixing clamp head 4 is an elastic medical-grade silicone or memory alloy micro-spring pad.

[0032] In the above technical solution, when the fixation clamp head 4 contacts the bone surface and applies pressure, the inner liner can undergo slight deformation, making the pressure distribution more uniform and avoiding stress concentration that could crush bone fragments. This is especially suitable for patients with osteoporosis.

[0033] See 2- Figure 3As shown in the preferred embodiment, the adjustable pliers head 5 includes a connecting seat 51, a locking frame 52, a telescopic shaft 53, a locking unit 54, a ball head unit 55, and a pliers head unit 56. The connecting seat 51 is fixedly installed at the lower end of the pliers handle 2. The connecting seat 51 has a hollow structure in the middle and an arc-shaped groove at the front end, which is connected to the interior of the connecting seat 51. The locking frames 52 are symmetrically installed at both ends of the connecting seat 51. The telescopic shaft is installed inside the connecting seat 51 through bearings. 53. A locking unit 54 is symmetrically installed on the telescopic shaft 53. The locking unit 54 is locked in place with the locking frame 52. Ball head units 55 are symmetrically installed at the ends of the telescopic shaft 53. There are three clamp head units 56. One clamp head unit 56 passes through the arc groove and connects to the middle of the telescopic shaft 53. The other clamp head units 56 are connected to the ball head units 55. At the same time, pulling two ball head units 55 outwards will separate and unlock the locking unit 54 from the locking frame 52 so that the angle of the clamp head units 56 can be adjusted.

[0034] In the above technical solution, when performing reduction clamping on the metacarpal fracture of the patient, since the contact surface of the comminuted fracture is often uneven and the fracture sites are usually not in the same plane, in order to avoid the cumbersome operation of clamping each fracture site once, multiple clamp head units 56 are provided, so that multiple clamping points are derived from the end of the clamp handle 2, so as to realize the simultaneous encirclement and gathering of multiple bone fragments. Multiple clamp head units 56 can be adjusted synchronously to satisfy the clamping of the fracture sites in the same plane, and multiple clamp head units 56 can also be adjusted separately to satisfy the clamping of fracture sites in different planes.

[0035] See Figure 4 As shown, as a preferred technical solution in this embodiment, the locking frame 52 has a circular structure, and locking teeth are evenly arranged on the outer surface of the locking frame 52.

[0036] See Figure 5 As shown, as a preferred technical solution of this embodiment, the telescopic shaft 53 includes a fixed end 531, a telescopic end 532, and a plug-in bracket 533. The fixed end 531 is installed inside the connecting seat 51 through a bearing. The telescopic ends 532 are symmetrically arranged on both sides of the fixed end 531. A sliding groove is provided on the telescopic end 532. The plug-in bracket 533 that cooperates with the sliding groove is installed on the fixed end 531. The plug-in bracket 533 has a regular polygonal structure.

[0037] In the above technical solution, when adjusting the angle of multiple clamp head units 56 synchronously, the doctor simultaneously pulls two ball head units 55 outward, so that the ball head units 55 can drive the telescopic end 532 to move outward along the axis of the fixed end 531. The plug frame 533 with a regular polygonal structure can ensure that the telescopic end 532 can only move horizontally and cannot rotate, so as to ensure the accuracy of the synchronous adjustment of multiple clamp head units 56. When the telescopic end 532 moves outward, it can drive the locking unit 54 to separate from the locking teeth on the locking frame 52. At this time, the telescopic shaft 53 is locked and the rotation of the telescopic shaft 53 is unrestricted, so that the angle of the clamp head unit 56 can be adjusted to meet the purpose of clamping the same or multiple fracture points in the same plane.

[0038] See Figures 5-6 As shown, as a preferred technical solution of this embodiment, the locking unit 54 includes a snap-fit ​​bracket 541 fixedly installed on the telescopic end 532. The snap-fit ​​bracket 541 has a circular structure and is provided with locking grooves that cooperate with locking teeth evenly. It also includes an end cap 542 sleeved on the telescopic end 532. The end cap 542 is installed on the side wall of the connecting seat 51 by screws. A telescopic spring 543 is also sleeved on the telescopic end 532 located between the snap-fit ​​bracket 541 and the end cap 542.

[0039] In the above technical solution, when the ball head unit 55 is pulled outward, the ball head unit 55 will drive the snap-fit ​​bracket 541 to move synchronously through the telescopic end 532. The locking groove on the snap-fit ​​bracket 541 will separate from the locking teeth, thereby releasing the lock on the telescopic shaft 53, making it easier for the telescopic shaft 53 to rotate, thereby realizing the function of adjusting the clamp head unit 56.

[0040] See Figure 7 As shown, in a preferred embodiment, the ball head unit 55 includes a ball head 551 and a rotating sleeve 552. The ball head 551 is fixedly installed on the outside of the telescopic end 532. The rotating sleeve 552 is rotatably mounted on the ball head 551. The gap between the rotating sleeve 552 and the ball head 551 is filled with magnetorheological fluid. A sealing cover is also provided on the outside of the gap between the ball head 551 and the rotating sleeve 552 to prevent the magnetorheological fluid from flowing out.

[0041] In the above technical solution, an electromagnet is installed inside the ball head 551. When a single angle adjustment is made to the clamp head unit 56 connected to the ball head unit 55, the electromagnet inside the ball head 551 does not work. At this time, the magnetorheological fluid exhibits low viscosity. The rotation of the rotating sleeve 552 can drive the clamp head unit 56 to adjust to any angle to meet the purpose of clamping multiple fractures on different planes. After the angle of the clamp head unit 56 is adjusted, electricity is supplied to the electromagnet. The electromagnet generates a magnetic field that causes the magnetorheological fluid to harden instantly. The rotating sleeve 552 will lock onto the ball head 551 and provide sufficient stability, thereby preventing the clamp head unit 56 from shaking when clamping and ensuring accurate clamping of the patient's fracture site.

[0042] See Figures 5-7 As shown, as a preferred technical solution in this embodiment, a protective sleeve 57 is also provided between the end cap 542 and the rotating sleeve 552. The protective sleeve 57 is retractable and is used to seal the gap between the rotating sleeve 552 and the end cap 542.

[0043] In the above technical solution, the protective sleeve 57 can effectively seal the wound, preventing blood, tissue fluid and other liquids generated during the operation from seeping in, and facilitating accurate cleaning after the operation.

[0044] See Figure 7 As shown, in this preferred embodiment, the clamp head unit 56 includes a clamp frame 561 and plug rods 562. There are three plug rods 562. One plug rod 562 passes through the arc-shaped groove and is installed on the fixed end 531. The remaining plug rods 562 are fixedly installed on the rotating sleeve 552. A retractable positioning protrusion is installed on the plug rod 562. The clamp frame 561 is installed on the plug rod 562. The clamp frame 561 is replaceable. The end of the clamp frame 561 is provided with a positioning hole that cooperates with the plug rod 562 and the slot is provided with a positioning hole that cooperates with the positioning protrusion.

[0045] In the above technical solution, the clamp frame 561 and the fixed clamp head 4 are replaceable, and the shape of the clamp frame 561 and the fixed clamp head 4 can be changed and adjusted according to actual use needs to meet the clamping needs of metacarpals in different positions. When in use, the slot at the end of the clamp frame 561 is connected to the plug rod 562. When the plug rod 562 is fully inserted, the positioning protrusion will be locked into the positioning hole, thereby stably locking the clamp frame 561.

[0046] It should be noted that an elastic layer is connected between the insertion rod 562, which passes through the inside of the arc-shaped groove, and the side wall of the arc-shaped groove, thereby preventing gaps from forming between the insertion rod 562 and the arc-shaped groove and preventing impurities generated during the operation from entering.

[0047] Based on the above structure, the reduction forceps for comminuted metacarpal fractures provided by this invention are implemented according to the following steps during operation: S1: Preoperative assessment and forceps pre-configuration First, the doctor assesses the morphology, bone fragment distribution, and fracture line direction of the metacarpal comminuted fracture based on preoperative imaging examinations (such as X-rays and CT three-dimensional reconstruction) and intraoperative observation. Then, based on the spatial geometry of the fracture site, the adjustable head 5 of the reduction clamp is pre-configured: if multiple points in the same plane need to be clamped, the angles of all head units 56 are adjusted simultaneously; if bone fragments in different planes or at different angles need to be clamped, each head unit 56 is adjusted separately.

[0048] S2: Multi-dimensional fine adjustment of pliers head angle Synchronous adjustment: The doctor pulls the two ball head units 55 outwards at the same time, causing the telescopic end 532 to move outwards against the elastic force of the telescopic spring 543, so that the locking bracket 541 of the locking unit 54 separates from the locking teeth of the locking bracket 52. At this time, due to the limitation of the regular polygonal structure of the plug bracket 533, the telescopic shaft 53 can only rotate as a whole and cannot move laterally. The doctor can then rotate the entire telescopic shaft 53 synchronously to adjust all the forceps units 56 to the same required angle. Then, the ball head unit 55 is released, and under the action of the telescopic spring 543, the locking bracket 541 and the locking bracket 52 re-engage and lock.

[0049] Individual adjustment: For the forceps unit 56 that requires independent angle adjustment, the doctor can directly rotate the rotating sleeve 552 connected to the forceps unit 56 that needs to be adjusted while keeping the telescopic shaft 53 locked. At this time, the electromagnet inside the ball head unit 55 is not energized, the magnetorheological fluid is in a liquid state, and the rotating sleeve 552 can rotate freely around the ball head 551. After adjusting to the target angle, the electromagnet of the ball head 551 is energized, and the magnetorheological fluid solidifies instantly under the action of the magnetic field, rigidly locking the rotating sleeve 552 and the ball head 551 to prevent shaking during clamping.

[0050] S3: Reset clamp placement and initial positioning The doctor holds the forceps handle 1 and the forceps handle 2, and securely places the hook-shaped fixing forceps head 4 on one end of the patient's metacarpal bone (e.g., distal or proximal stabilizing bone block); then, the relative angle between the forceps handle 1 and the forceps handle 2 is pre-adjusted: the locking screw 14 is loosened so that it slides in the arc-shaped groove of the guide frame 13, so that the adjustable forceps head 5 as a whole reaches the optimal spatial orientation that can cover the target fracture area.

[0051] S4: Dynamic adaptive clamping and elastic pressure reset The doctor grips the first and second handles of the forceps, and through the second handle, the adjustable forceps head 5, which has been precisely positioned, presses down. The clamp frames 561 of multiple forceps head units 56 simultaneously or separately contact the fracture fragments on different planes. Under pressure, the elastic pads of the inner layer of the fixed forceps head 4 and the multi-point design of the adjustable forceps head 5 together achieve adaptive clamping of irregular bone surfaces, evenly distribute pressure, and effectively gather bone fragments. At the same time, the elastic element 12 connected between the limiting blocks 11 is compressed, transforming the doctor's gripping force into a continuous, stable, and gentle elastic pressure acting on the fracture ends to complete the reduction.

[0052] S5: Lockout Maintenance and Follow-up Operations After the fracture clamp is used to reduce the fracture, tighten the locking screw 14 to securely lock the relative positions of the clamp handle 1 and the clamp handle 2. At this time, the reduction clamp, through the combined action of its mechanical structure and the elastic element 12, can provide a stable temporary fixation environment for the fracture ends without the doctor having to hold the handle tightly. The doctor is thus freed to perform subsequent internal fixation operations, such as placing mini-plates and screwing in screws, until the internal fixation is completed, at which point the reduction clamp is released and removed.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A reduction clamp for comminuted metacarpal fractures, characterized in that, include: The clamp handles are arranged in a cross pattern. A rotating shaft (3) is installed at the intersection of the clamp handles. Limiting blocks (11) are installed on the inner side of the upper end of the clamp handles. An elastic element (12) is installed between the two limiting blocks (11). A guide frame (13) is installed on the clamp handle (13). An arc-shaped sliding groove is opened in the middle of the guide frame (13). A locking screw (14) is fixedly installed on the clamp handle (2). The locking screw (14) is located inside the arc-shaped sliding groove. A fixed clamp head (4) is installed at the lower end of the clamp handle (1). An adjustable clamp head (5) is fixedly installed at the lower end of the clamp handle (2).

2. The reduction clamp for comminuted metacarpal fractures according to claim 1, characterized in that: The fixing forceps (4) has a hook-shaped structure. The surface of the fixing forceps (4) is a blunt micro-tooth structure, and the inner layer of the fixing forceps (4) is a layer of elastic medical-grade silicone or memory alloy micro-spring pad.

3. A reduction clamp for comminuted metacarpal fractures according to claim 2, characterized in that: The adjustable pliers head (5) includes a connecting seat (51), a locking frame (52), a telescopic shaft (53), a locking unit (54), a ball head unit (55), and a pliers head unit (56). The lower end of the pliers handle (2) is fixedly installed with the connecting seat (51). The middle part of the connecting seat (51) is hollow. An arc-shaped groove is opened at the front end of the connecting seat (51), and the arc-shaped groove is connected to the inside of the connecting seat (51). The locking frames (52) are symmetrically installed on the left and right ends of the connecting seat (51). The telescopic shaft (53) is installed inside the connecting seat (51) through a bearing. 3) A locking unit (54) is symmetrically installed on the upper part. The locking unit (54) is locked in place with the locking frame (52). Ball head units (55) are symmetrically installed at the end of the telescopic shaft (53). There are three plier head units (56). One plier head unit (56) passes through the arc groove and is connected to the middle of the telescopic shaft (53). The other plier head units (56) are connected to the ball head units (55). At the same time, two ball head units (55) are pulled outward to separate and unlock the locking unit (54) from the locking frame (52) so that the angle of the plier head unit (56) can be adjusted.

4. A reduction clamp for comminuted metacarpal fractures according to claim 3, characterized in that: The locking frame (52) has a circular structure, and locking teeth are evenly arranged on the outer side of the locking frame (52).

5. A reduction clamp for comminuted metacarpal fractures according to claim 4, characterized in that: The telescopic shaft (53) includes a fixed end (531), a telescopic end (532), and a plug-in bracket (533). The fixed end (531) is installed inside the connecting seat (51) by a bearing. The telescopic ends (532) are symmetrically arranged on both sides of the fixed end (531). The telescopic end (532) is provided with a sliding groove. The fixed end (531) is equipped with a plug-in bracket (533) that cooperates with the sliding groove. The plug-in bracket (533) has a regular polygonal structure.

6. A reduction clamp for comminuted metacarpal fractures according to claim 5, characterized in that: The locking unit (54) includes a snap-fit ​​bracket (541) fixedly installed on the telescopic end (532). The snap-fit ​​bracket (541) has a circular structure and is evenly provided with locking grooves that cooperate with locking teeth. It also includes an end cap (542) sleeved on the telescopic end (532). The end cap (542) is installed on the side wall of the connecting seat (51) by screws. A telescopic spring (543) is also sleeved on the telescopic end (532) located between the snap-fit ​​bracket (541) and the end cap (542).

7. A reduction clamp for comminuted metacarpal fractures according to claim 6, characterized in that: The ball head unit (55) includes a ball head (551) and a rotating sleeve (552). The ball head (551) is fixedly installed on the outside of the telescopic end (532). The rotating sleeve (552) is rotatably mounted on the ball head (551). The gap between the rotating sleeve (552) and the ball head (551) is filled with magnetorheological fluid.

8. A reduction clamp for comminuted metacarpal fractures according to claim 7, characterized in that: A protective sleeve (57) is also provided between the end cap (542) and the rotating sleeve (552). The protective sleeve (57) is retractable and is used to seal the gap between the rotating sleeve (552) and the end cap (542).

9. A reduction clamp for comminuted metacarpal fractures according to claim 8, characterized in that: The clamp head unit (56) includes a clamp frame (561) and plug rods (562). There are three plug rods (562). One plug rod (562) is installed on the fixed end (531) through the arc groove. The remaining plug rods (562) are fixedly installed on the rotating sleeve (552). The plug rods (562) are equipped with retractable positioning protrusions. The clamp frame (561) is installed on the plug rods (562). The clamp frame (561) is replaceable. The end of the clamp frame (561) is provided with a positioning hole that cooperates with the plug rod (562). The slot is provided with a positioning hole that cooperates with the positioning protrusion.

Images