Tibial plateau collapse fracture bone block repositor

Abstract

The utility model relates to the technical field of surgical instruments, and provides a tibial plateau collapse fracture bone block repositor which comprises a cavity channel formed in a tibia side wall, a tibial plateau is provided with a collapse bone block, the cavity channel is communicated with the tibia side wall and a bone wall below the collapse bone block, the tibial plateau collapse fracture bone block repositor comprises an operating rod, and the operating rod is provided with a spherical groove; the resetting head is provided with a connecting section and a resetting section; the reset section is located in the cavity and used for abutting against the collapsed bone block and pushing the collapsed bone block to reset; the connecting section is provided with a spherical protrusion, the spherical protrusion is located in the spherical groove, and the spherical groove and the spherical protrusion jointly form a spherical hinge pair. By means of the technical scheme, the technical problems that in the prior art, a tibial plateau collapse fracture bone block repositor cannot achieve accurate positioning and large-range angle adjustment, and is difficult to adapt to various tibial plateau collapse fracture conditions are solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of surgical instruments, and in particular, to a tibial plateau collapse fracture bone block reposition device. BACKGROUND

[0002] In the field of orthopedic surgery, the treatment of tibial plateau collapse fractures is of great importance, and the tibial plateau collapse fracture bone block reposition device is a key instrument for fracture reduction. However, some conventional reposition devices have relatively simple structures, and the key parts have fixed angles, for example, the angle between the curved rod and the reposition head of some reposition devices cannot be adjusted, which makes it difficult for the reposition head to change the insertion angle flexibly according to the collapse degree of the fracture, and it is difficult to smoothly extend to the bottom of the collapsed bone block in actual operation.

[0003] Due to the extremely complex and diverse types of tibial plateau fractures, the fracture angles and bone block collapse conditions are different, especially complex fractures such as multi-directional collapse and severe displacement, the reposition device with an angle that cannot be adjusted cannot be accurately placed in the appropriate surgical position, and it is difficult to reduce the bone block at the best angle. Moreover, there are cases where the size of the collapsed bone block varies greatly, which requires switching to different specifications of the reposition device, greatly increasing the difficulty of the operation and seriously affecting the surgical outcome.

[0004] In addition, in order to use such a reposition device with an angle that cannot be adjusted to complete the operation, the doctor is often forced to enlarge the surgical incision and increase the range of stripping and pulling the surrounding tissue, which undoubtedly greatly increases the surgical trauma and prolongs the operation time, not only increasing the risk of the patient during the operation, but also significantly increasing the difficulty of the patient's postoperative recovery. SUMMARY

[0005] To overcome the above-mentioned defects, embodiments of the present disclosure provide a tibial plateau collapse fracture bone block reposition device, which solves the technical problem that the tibial plateau collapse fracture bone block reposition device in the prior art cannot adjust the angle in a wide range and is difficult to adapt to various tibial plateau collapse fracture conditions.

[0006] According to one aspect, at least one embodiment of the present disclosure provides a tibial plateau collapse fracture bone block reposition device for reducing the collapsed bone block after a tibial plateau collapse fracture; a cavity is formed in a tibial side wall, the cavity communicates the tibial side wall and a bone wall below the collapsed bone block, and comprises:

[0007] an operating rod having a spherical groove;

[0008] a reposition head having a connecting section and a reposition section;

[0009] the reposition section is located in the cavity and used for abutting against the collapsed bone block and pushing the collapsed bone block to be reduced;

[0010] The connecting section has a spherical protrusion which is located in the spherical groove, and the spherical groove and the spherical protrusion jointly form a spherical hinge pair.

[0011] For example, the tibial plateau collapse fracture bone block reposition device provided by at least one embodiment of the present disclosure has an included angle between the connecting section axis and the reposition section axis.

[0012] For example, the tibial plateau collapse fracture bone block reposition device provided by at least one embodiment of the present disclosure has a first guide pin hole and a second guide pin hole, the first guide pin hole coincides with the reposition section axis, and the second guide pin hole does not coincide with the reposition section axis.

[0013] For example, the tibial plateau collapse fracture bone block reposition device provided by at least one embodiment of the present disclosure further comprises

[0014] A connecting piece, the reposition head is connected with the operating rod through the connecting piece; the spherical protrusion is located on the connecting piece; and the connecting section is swingably arranged on the connecting piece.

[0015] For example, the tibial plateau collapse fracture bone block reposition device provided by at least one embodiment of the present disclosure has a first abutting surface and a second abutting surface, and further comprises

[0016] A fastener is used to tightly abut the first abutting surface and the second abutting surface, and limit the relative position of the connecting section and the connecting piece.

[0017] For example, the tibial plateau collapse fracture bone block reposition device provided by at least one embodiment of the present disclosure further comprises

[0018] A mounting piece, the operating rod is connected with the connecting piece through the mounting piece, and the spherical groove is located on the mounting piece;

[0019] A top rod is slidably arranged on the mounting piece, one end of the top rod extends into the spherical groove, and the top rod extrudes the spherical protrusion after sliding close to the connecting piece, so as to limit the position of the mounting piece and the connecting piece.

[0020] For example, the tibial plateau collapse fracture bone block reposition device provided by at least one embodiment of the present disclosure further comprises

[0021] A rotating piece is rotatably arranged on the operating rod, the rotating piece has an extrusion surface and a contact surface, and after the rotating piece is rotated, the top rod is in contact with the extrusion surface or the contact surface, so that the top rod extrudes or does not extrude the spherical protrusion.

[0022] For example, the first abutting surface has a plurality of limiting protrusions in the tibial plateau collapse fracture bone block repositioning device provided by at least one embodiment of the present disclosure, and the first abutting surface abuts against the second abutting surface through the limiting protrusions.

[0023] For example, the second abutting surface has a plurality of limiting grooves in the tibial plateau collapse fracture bone block repositioning device provided by at least one embodiment of the present disclosure, and after the first abutting surface abuts against the second abutting surface, the limiting protrusions enter the limiting grooves.

[0024] For example, the limiting protrusions are circumferentially and uniformly distributed around the center of the first abutting surface in the tibial plateau collapse fracture bone block repositioning device provided by at least one embodiment of the present disclosure, and the limiting grooves are circumferentially and uniformly distributed along the center of the second abutting surface.

[0025] The embodiments of the present disclosure have the following beneficial effects:

[0026] In the present disclosure, during the operation, the doctor holds the operating rod in hand and inserts the repositioning head of the repositioning device into the pre-formed cavity of the tibial lateral wall. Since the repositioning segment and the connecting segment are connected through the spherical hinge pair, during the insertion process, the doctor can flexibly adjust the direction of the repositioning head according to the direction of the cavity and the position of the collapsed bone block, so that the repositioning segment can smoothly reach the bottom of the collapsed bone block along the cavity and tightly abut against the collapsed bone block. Then, the doctor applies a pushing force through the operating rod to push the collapsed bone block upward by using the repositioning segment.

[0027] The advantage is that the design of the spherical hinge pair gives the repositioning head great flexibility. Compared with the conventional repositioning device with fixed angle, the structure enables the repositioning head to freely adjust the angle in three-dimensional space, easily adapt to various complex cavity directions and bone block positions, smoothly reach the bottom of the collapsed bone block, and improve the success rate of repositioning. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments of the present disclosure will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present disclosure. Those skilled in the art can obtain other drawings according to the content of the example embodiments of the present disclosure and these drawings without creating any creative labor.

[0029] Figure 1 The use schematic diagram of the tibial plateau collapse fracture bone block repositioning device in one embodiment of the present disclosure;

[0030] Figure 2 The Figure 1 The enlarged view of A in the figure;

[0031] Figure 3Fig. 1 is a schematic view of the internal structure of a tibial plateau collapse fracture bone block reposition device according to an embodiment of the present disclosure;

[0032] Figure 4 Fig. 2 is a schematic view of the internal structure of a tibial plateau collapse fracture bone block reposition device according to an embodiment of the present disclosure; Figure 3 Fig. 3 is an enlarged view of part B in Fig. 2;

[0033] Figure 5 Fig. 4 is a schematic view of the internal structure of a tibial plateau collapse fracture bone block reposition device according to an embodiment of the present disclosure; Figure 3 Fig. 5 is an enlarged view of part C in Fig. 4;

[0034] Figure 6 Fig. 6 is a schematic view of the internal structure of a tibial plateau collapse fracture bone block reposition device according to an embodiment of the present disclosure;

[0035] Figure 7 Fig. 7 is a schematic view of the internal structure of a tibial plateau collapse fracture bone block reposition device according to an embodiment of the present disclosure; Figure 6 Fig. 8 is an enlarged view of part D in Fig. 7;

[0036] Figure 8 Fig. 9 is a schematic view of the internal structure of a tibial plateau collapse fracture bone block reposition device according to an embodiment of the present disclosure;

[0037] Figure 9 Fig. 10 is an enlarged view of part E in Fig. 9. Figure 8

[0038] Fig. 1 is a schematic view of the internal structure of a tibial plateau collapse fracture bone block reposition device according to an embodiment of the present disclosure; DETAILED DESCRIPTION

[0039] The present disclosure will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present disclosure, but not to limit the present disclosure.

[0040] In order to make the drawing simple, only the parts related to the disclosure are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this text, “one” not only means “only one”, but also means “more than one”, and “several” includes “two” and “more than two”.

[0041] ​It should be noted that, in the present document, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0042] In the present disclosure, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0044] In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] As Figures 1-2 shown, it shows a tibial plateau collapse fracture bone block reducer in an embodiment of the present disclosure, which is used for reducing the collapsed bone block 12 after the tibial 1 plateau collapse fracture; the tibial 1 side wall is provided with a cavity 11, which communicates the tibial 1 side wall and the bone wall below the collapsed bone block 12, and includes an operating rod 2, which has a spherical groove 21; the reducing head 3 has a connecting section 31 and a reducing section 32; the reducing section 32 is located in the cavity 11, and is used for abutting against the collapsed bone block 12 and pushing the collapsed bone block 12 to reduce; the connecting section 31 has a spherical protrusion 311, which is located in the spherical groove 21, and the spherical groove 21 and the spherical protrusion 311 jointly form a spherical hinge pair.

[0046] For example, as Figures 1-2As shown, during the surgical procedure, the surgeon holds the operating rod 2 in their hand and inserts the reduction segment 32 of the reduction head 3 through the pre-drilled cavity 11 on the side wall of the tibia 1. Since the reduction segment 32 is connected to the connecting segment 31 via a ball joint, the surgeon can flexibly adjust the direction of the reduction head 3 during insertion according to the direction of the cavity 11 and the position of the collapsed bone fragment 12, allowing the reduction segment 32 to smoothly reach below the collapsed bone fragment 12 along the cavity 11 and fit tightly against it. Then, the surgeon applies a pushing force using the operating rod 2, using the reduction segment 32 to push the collapsed bone fragment 12 upwards for reduction.

[0047] The advantage lies in the fact that the ball joint design gives the reduction head 3 great flexibility. Compared with traditional fixed-angle reduction devices, this structure allows the reduction head 3 to freely adjust its angle in three-dimensional space, easily adapting to various complex cavity 11 orientations and bone block positions, and successfully reaching the bottom of the collapsed bone block 12, thus improving the success rate of reduction.

[0048] In some examples, there is an angle between the axis of connecting segment 31 and the axis of reset segment 32.

[0049] For example, such as Figure 3 As shown, during surgery for a collapsed tibial plateau fracture, the surgeon first uses imaging data to thoroughly understand the patient's fracture details, including the degree and direction of the collapse of the tibial plateau, as well as the damage to surrounding bone tissue. Based on this information, the surgeon selects a reduction device with an appropriate angle. During the surgery, the surgeon holds the operating rod 2 steadily and aligns the reduction segment 32 of the reduction head 3 with the cavity 11 on the lateral wall of the tibial plateau, beginning slow insertion. Due to the specific angle between the connecting segment 31 and the reduction segment 32, the reduction head 3 skillfully avoids surrounding important tissues and blood vessels during insertion, smoothly penetrating along the cavity 11 to the area below the collapsed bone fragment 12. Once the reduction segment 32 reaches the area below the collapsed bone fragment 12, the surgeon, based on the actual situation, slightly rotates and adjusts the operating rod 2, utilizing the angle between the connecting segment 31 and the reduction segment 32 to ensure that the reduction segment 32 fits tightly against the collapsed bone fragment 12 at the optimal angle. At this point, the surgeon applies appropriate thrust through the operating rod 2, and the reduction segment 32 precisely lifts the collapsed bone fragment 12 upwards, achieving fracture reduction. During the reduction process, the doctor can also adjust the force and direction of reduction by using the angle between the connecting segment 31 and the reduction segment 32 as needed, to ensure that the bone fragment can be accurately reduced to the ideal position.

[0050] In some examples, the reset segment 32 has a first guide hole 321 and a second guide hole 322, the first guide hole 321 being coincident with the axis of the reset segment 32, and the second guide hole 322 not being coincident with the axis of the reset segment 32.

[0051] For example, such as Figures 3-5As shown, in the tibial plateau collapse fracture surgery, after the reduction section 32 successfully reaches under the collapsed bone block 12, the doctor will evaluate the size of the collapsed bone block 12. If it is judged that the collapsed bone block 12 is small, the doctor will accurately insert the guide needle into the first guide needle hole 321 located in the center of the reduction section 32. At this time, with the first guide needle hole 321 as the guide, the doctor pushes the reduction section 32 through the operating rod 2, uses the included angle between the connecting section 31 and the reduction section 32 to make the reduction section 32 stably contact the collapsed bone block 12, and then gradually lifts the collapsed bone block 12 upward along the direction of the first guide needle hole 321 to achieve accurate reduction.

[0052] Specifically, first, the position of the collapsed bone block 12 is accurately positioned by a 2.mm diameter Kirschner wire under C-arm fluoroscopy, then a window is opened in the proximal tibia 1 lateral wall cortex (the windowing method is to grind the tibia lateral cortex with a ring drill with a diameter equivalent to the reducer), and then the reducer top hole is passed through the Kirschner wire, and the collapsed bone block 12 is accurately reduced by rotating the reducer head and hitting the reducer tail to restore the joint surface height of the tibial plateau 1. The body is small, light in weight, and has a rich assembly form, can realize universal adjustment, can realize accurate reduction of the collapsed bone block 12 in any area of the tibial plateau 1, reduce patient trauma, and has great clinical popularization value and application prospect.

[0053] If the collapsed bone block 12 is too large, the doctor will choose the eccentrically arranged second guide needle hole 322. After the doctor inserts the guide needle into the second guide needle hole 322, the guide needle is used as the rotating shaft, and the doctor skillfully uses the included angle between the connecting section 31 and the reduction section 32 to make the reduction section 32 eccentrically rotate around the second guide needle hole 322. During the rotation process, the reduction section 32 can continuously adjust the contact position with the larger collapsed bone block 12, expand the contact range with the bone block, and make the reduction section 32 fully contact the collapsed bone block 12 from multiple angles. Then the doctor applies appropriate pushing force through the operating rod 2 to reduce the bone block to the ideal position.

[0054] The advantage is that the special design of the first guide needle hole 321 and the second guide needle hole 322 significantly improves the adaptability of the reducer in different sizes of the collapsed bone block 12. For smaller collapsed bone blocks 12, the first guide needle hole 321 can provide accurate guidance to ensure the accuracy and stability of the reduction process. For larger collapsed bone blocks 12, the eccentric arrangement of the second guide needle hole 322 and the eccentric rotation of the reduction section 32 greatly expand the contact range of the reduction section 32 with the bone block, solving the problem that traditional reducers are difficult to handle large bone blocks. The cooperative design of the two guide needle holes enables the doctor to more efficiently and accurately complete the reduction operation when facing various complex tibial plateau collapse fracture situations.

[0055] In some examples, a connector 4 is also included, through which the reset head 3 is connected to the operating lever 2; a spherical protrusion 311 is located on the connector 4; and a connecting segment 31 is oscillatingly disposed on the connector 4.

[0056] For example, such as Figure 7 As shown, before the surgery, the surgeon selects a suitable reduction head 3 based on the complexity of the patient's collapsed tibial plateau fracture and the previous plan for the use of the guide pin hole. The reduction head 3 is then connected to the operating rod 2 via the connector 4. When the surgery requires adjusting the angle of the reduction head 3 to better cooperate with the guide pin hole, such as during the eccentric rotational reduction of a large bone fragment using the second guide pin hole 322, and it is found that the angle still needs fine-tuning, the surgeon can manipulate the swinging structure of the connecting segment 31 on the connector 4. By applying gentle force, the connecting segment 31 swings relative to the connector 4, fine-tuning the angle of the reduction head 3 to ensure that during rotational reduction around the second guide pin hole 322, the reduction segment 32 always maintains optimal contact with the collapsed bone fragment 12.

[0057] The advantage lies in the design of the connector 4, which makes the repositioning head 3 easy to replace, allowing doctors to quickly switch between different surgical needs. The swing function of the connecting segment 31 on the connector 4 provides additional angle adjustment flexibility for use with the guide pin hole. When using the first guide pin hole 321 to precisely reposition small bone fragments, it ensures that the contact angle between the repositioning segment 32 and the bone fragment is accurate; when using the second guide pin hole 322 to perform eccentric rotation repositioning of large bone fragments, the angle can be finely adjusted at any time, improving the repositioning effect and enhancing the accuracy and efficiency of the surgical operation.

[0058] In some examples, the connecting segment 31 has a first abutting surface 312, the connector 4 has a second abutting surface 41, and a fastener 5 is also included to tightly abut the first abutting surface 312 and the second abutting surface 41, thereby limiting the relative position of the connecting segment 31 and the connector 4.

[0059] For example, such as Figure 7 As shown, after the reduction head 3 is installed onto the operating rod 2 via the connector 4 and the angle is adjusted according to the use of the guide pin hole, the doctor uses the fastener 5 to fix the connecting section 31 and the connector 4. For example, a screw is used as the fastener 5, and it is tightened with a screwdriver to ensure that the first abutment surface 312 of the connecting section 31 and the second abutment surface 41 of the connector 4 are tightly fitted. When using the first guide pin hole 321 to reduce small bone fragments, it is necessary to ensure that the angle of the reduction head 3 is stable to prevent the angle deviation caused by external force from affecting the reduction accuracy. During the process of using the second guide pin hole 322 to perform eccentric rotation reduction of large bone fragments, even if the reduction section 32 is subjected to a large reaction force, the relative position of the connecting section 31 and the connector 4 can be fixed because the fastener 5 tightens the two abutment surfaces, thus maintaining the angle stability of the reduction head 3.

[0060] The advantage is that the fastener 5 ensures the stability of the connection between the connecting segment 31 and the connecting piece 4, whether the first guide pin hole 321 is used for accurate reduction of small bone blocks or the second guide pin hole 322 is used for complex eccentric rotation reduction of large bone blocks, the angle of the reduction head 3 will not change accidentally during the operation, ensuring the stability and accuracy of the reduction operation.

[0061] In some examples, the operating rod 2 is connected to the connecting piece 4 through a mounting piece 6, and the spherical groove 21 is located on the mounting piece 6; the top rod 7 is slidingly arranged on the mounting piece 6, and one end of the top rod 7 extends into the spherical groove 21; when the top rod 7 slides close to the connecting piece 4, it presses the spherical protrusion 311, which is used to limit the position of the mounting piece 6 and the connecting piece 4.

[0062] For example, as shown in Figure 7 After the operating rod 2, the mounting piece 6 and the connecting piece 4 are connected, the doctor adjusts the angle of the reduction head 3 according to the needs of the operation. If the first guide pin hole 321 is used to reduce small bone blocks, after adjusting the angle, the top rod 7 is slid to make one end of it extend into the spherical groove 21 to press the spherical protrusion 311, thereby fixing the position of the mounting piece 6 and the connecting piece 4, ensuring the stability of the angle during the reduction process. When the second guide pin hole 322 is used to eccentrically rotate and reduce large bone blocks, after adjusting the angle each time, the top rod 7 is slid to press the spherical protrusion 311, fixing the angle of the reduction head 3 at that time. If the angle needs to be adjusted again, the top rod 7 is slid away from the spherical protrusion 311, and then the angle is adjusted and fixed again.

[0063] The advantage is that the top rod 7 provides a simple and effective way to fix the angle of the reduction head 3. In the process of using different guide pin holes to reduce different sizes of bone blocks, the angle of the reduction head 3 can be quickly and stably fixed, and when the angle needs to be adjusted, the operation is convenient, meeting the needs of flexible adjustment of the angle of the reduction head 3 during the operation.

[0064] In some examples, a rotating piece 8 is also included, which is rotatably arranged on the operating rod 2, and has a pressing surface 81 and a contact surface 82. After the rotating piece 8 is rotated, the top rod 7 is in contact with the pressing surface 81 or the contact surface 82, so that the top rod 7 presses or does not press the spherical protrusion 311.

[0065] For example, as shown in Figure 7As shown, during the surgical procedure, the surgeon mounts the rotating component 8 onto the operating rod 2. When preparing to use the first guide pin hole 321 to reposition the small bone fragment, the rotating component 8 is rotated, causing the push rod 7 to contact the compression surface 81. The push rod 7 is compressed, pushing the spherical protrusion 311, thus fixing the position of the mounting component 6 and the connecting component 4 and ensuring angle stability during the repositioning process. When switching to using the second guide pin hole 322 for eccentric rotational repositioning of the large bone fragment, after each angle adjustment, the rotating component 8 is rotated to compress the spherical protrusion 311 to fix the angle. If the angle needs to be changed, the rotating component 8 is rotated in the opposite direction, causing the push rod 7 to contact the contact surface 82, releasing the compression on the spherical protrusion 311 and facilitating readjustment of the angle.

[0066] The advantage is that the rotating component 8 makes fixing and adjusting the angle of the reduction head 3 more convenient. In complex surgical procedures involving the reduction of different types of bone fragments using different guide pin holes, the surgeon can quickly fix and adjust the angle of the reduction head 3 simply by rotating the rotating component 8, without the need for additional tools.

[0067] In some examples, the first abutting surface 312 has a plurality of limiting protrusions 3121, and the first abutting surface 312 abuts against the second abutting surface 41 through the limiting protrusions 3121.

[0068] For example, such as Figure 9 As shown, when the fastener 5 is used to fasten the connecting section 31 and the connector 4, the limiting protrusion 3121 on the first abutment surface 312 contacts the second abutment surface 41. As the fastener 5 is tightened, the limiting protrusion 3121 gradually comes into close contact with the second abutment surface 41. When the first guide pin hole 321 is used to reset the small bone block, these limiting protrusions 3121 increase the friction between the two abutment surfaces, preventing relative sliding between the connecting section 31 and the connector 4, and ensuring the stability of the reset head 3 angle. When the second guide pin hole 322 is used to perform eccentric rotation reset of the large bone block, even if the reset section 32 is subjected to a large torsional force, the limiting protrusions 3121 can effectively prevent relative rotation between the connecting section 31 and the connector 4, maintaining the predetermined angle of the reset head 3.

[0069] In some examples, the second abutment surface 41 has several limiting grooves 411. After the first abutment surface 312 abuts against the second abutment surface 41, the limiting protrusion 3121 enters the limiting groove 411.

[0070] For example, such as Figure 7As shown, when fastening the connecting section 31 and the connector 4, the limiting protrusion 3121 on the first abutment surface 312 accurately embeds into the limiting groove 411 on the second abutment surface 41. When the first guide pin hole 321 is used to reset the small bone block, this interlocking structure restricts the relative movement between the connecting section 31 and the connector 4 in all directions, ensuring the accuracy of the angle of the reset head 3 during the reset process. When the second guide pin hole 322 is used to perform eccentric rotation reset of the large bone block, even if the reset section 32 is subjected to large external forces from different directions, the tight fit between the limiting protrusion 3121 and the limiting groove 411 can effectively prevent relative rotation and displacement between the connecting section 31 and the connector 4, ensuring that the reset head 3 stably contacts the collapsed bone block 12 at a suitable angle, completing the reset operation of the collapsed bone block 12.

[0071] In some examples, the limiting protrusions 3121 are evenly distributed around the center of the first abutment surface 312; the limiting grooves 411 are evenly distributed around the center of the second abutment surface 41.

[0072] For example, such as Figure 7 As shown, during the installation and fixing of the connecting section 31 and the connector 4, since the limiting protrusions 3121 are evenly distributed around the center of the first abutment surface 312 and the limiting grooves 411 are evenly distributed around the center of the second abutment surface 41, regardless of the angle at which the reset head 3 is installed onto the operating rod 2 through the connector 4, and regardless of whether the reset operation is performed using the first guide pin hole 321 or the second guide pin hole 322, the limiting protrusions 3121 and the limiting grooves 411 can be accurately aligned. When tightening the fastener 5, each limiting protrusion 3121 is evenly embedded into the corresponding limiting groove 411, ensuring that the connection between the connecting section 31 and the connector 4 remains stable in all directions. When using the first guide pin hole 321 to reset small bone blocks, it can resist minor external forces from all directions; when using the second guide pin hole 322 to perform eccentric rotation reset of large bone blocks, this evenly distributed circumferential limiting structure can effectively resist complex external force conditions, preventing relative movement between the connecting section 31 and the connector 4.

[0073] The advantage lies in the circumferentially distributed design of the limiting protrusions 3121 and the limiting grooves 411, which makes the connection between the connecting section 31 and the connecting piece 4 more uniform and stable. In various complex surgical environments where different guide pin holes are used for the repositioning of bone blocks of different sizes, the angle of the repositioning head 3 can be ensured in all directions, greatly improving the adaptability and reliability of the repositioning device.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A tibial plateau collapse fracture reduction device for reducing collapsed bone fragments (12) after a tibial (1) plateau collapse fracture; wherein a cavity (11) is provided on the lateral wall of the tibia (1), the cavity (11) connecting the lateral wall of the tibia (1) and the bone wall below the collapsed bone fragment (12), characterized in that, The utility model provides a kind of bone reduction device, including: Operating rod (2), the operating rod (2) has spherical recess (21); Reset head (3), the reset head (3) has connecting section (31) and reset section (32); The reset section (32) is located in the cavity (11), for with the collapsed bone block (12) abuts, push the collapsed bone block (12) reset; The connecting section (31) has spherical protrusion (311), the spherical protrusion (311) is located in the spherical recess (21), the spherical recess (21) and the spherical protrusion (311) jointly form spherical hinge pair.

2. The tibial platform collapse fracture bone block reducer according to claim 1, characterized in that, The connecting section (31) axis and the reset section (32) axis have included angle.

3. A tibial platform collapse fracture bone block reducer according to claim 2, characterized in that, The reset section (32) has first guide pin hole (321) and second guide pin hole (322), the first guide pin hole (321) coincides with the reset section (32) axis, the second guide pin hole (322) does not coincide with the reset section (32) axis.

4. The tibial platform collapse fracture bone block reducer of claim 1, wherein, Also include: Connecting piece (4), the reset head (3) is connected with the operating rod (2) by the connecting piece (4);The spherical protrusion (311) is located on the connecting piece (4);The connecting section (31) is swinged and arranged on the connecting piece (4).

5. A tibial platform collapse fracture bone block reducer according to claim 4, characterized in that, The connecting section (31) has first abutment surface (312), the connecting piece (4) has second abutment surface (41), also include: Fastener (5), the fastener (5) is used to make the first abutment surface (312) and the second abutment surface (41) close abutment, limit the relative position of the connecting section (31) and the connecting piece (4).

6. A tibial platform collapse fracture bone block reducer according to claim 4, characterized in that, Also include: Mounting (6), the operating rod (2) is connected with the connecting piece (4) by the mounting (6), the spherical recess (21) is located on the mounting (6); Ejector rod (7), the ejector rod (7) is slidably arranged on the mounting (6), one end of the ejector rod (7) extends into the spherical recess (21), after the ejector rod (7) is slid close to the connecting piece (4), the spherical protrusion (311) is extruded, for limiting the position of the mounting (6) and the connecting piece (4).

7. A tibial platform collapse fracture bone block reducer according to claim 6, characterized in that, Also include: Rotating member (8), the rotating member (8) is rotationally arranged on the operating rod (2), the rotating member (8) has extrusion surface (81) and contact surface (82), after the rotating member (8) is rotated, the ejector rod (7) is contacted with the extrusion surface (81) or the contact surface (82), so that the ejector rod (7) extrudes or does not extrude the spherical protrusion (311).

8. The tibial platform collapse fracture bone block reducer of claim 5, wherein, The first abutment surface (312) has a plurality of limit protrusions (3121), and the first abutment surface (312) is abutted with the second abutment surface (41) through the limit protrusions (3121).

9. The tibial platform collapse fracture bone block reducer of claim 8, wherein, The second abutment surface (41) has a plurality of limit grooves (411), and after the first abutment surface (312) is abutted with the second abutment surface (41), the limit protrusions (3121) enter the limit grooves (411).

10. The tibial platform collapse fracture bone block reducer of claim 9, wherein, The limiting protrusions (3121) are uniformly distributed around the center of the first abutting surface (312) in the circumferential direction; the limiting grooves (411) are uniformly distributed along the center of the second abutting surface (41) in the circumferential direction.

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