Femoral neck fracture fixation device

Abstract

The present invention relates to a femoral neck fracture fixation device, which comprises a mounting base plate, a pressurized anti-slip sleeve, a pressurized screw and two reinforcing screws; the mounting base plate is provided with a pressurized screw hole and two mounting holes; the outer wall of the pressurized anti-slip sleeve is provided with a pressurized external thread for screwing with the pressurized screw hole, and the inner wall is provided with a pressurized internal thread opposite to the spiral direction of the pressurized external thread; the pressurized screw is a semi-threaded screw, and the outer periphery of its nut is provided with a thread for screwing with the pressurized internal thread, the bolt of the pressurized screw is used to extend from the proximal end of the fractured femur to the femoral head through the anti-slip sleeve screwed with the pressurized screw hole, so as to pressurize and fix the femoral neck; the bolts of the two reinforcing screws are used to extend from the proximal end of the fractured femur to the femoral head through the two mounting holes respectively, so as to reinforce the fixation of the femoral neck by the pressurized screw.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a femoral neck fracture fixation device. Background Art

[0002] Femoral neck fracture is the most common hip injury, often occurring in the elderly. Femoral neck fractures in the elderly are often caused by careless falls while walking, with the hips landing on the ground. After the injury, the hips hurt and the person cannot stand or walk. Femoral neck fractures in young people are often caused by strong impacts from car accidents or falls from heights. After a femoral neck fracture, the femoral head will generally be significantly displaced, so surgery is required to reposition and fix the femoral neck.

[0003] At present, fixation devices such as DHS (dynamic hip screw) + anti-rotation semi-threaded screw, PCCP (percutaneous compression plate screw internal fixation), Aesculap Targon system, Smith & Nephew Conquest system, etc. are generally used to fix femoral neck fractures. Although the above fixation devices can ensure that the femoral neck will not shake up and down after fixation through the interaction of several screws, that is, it has good angular stability; it can also drive the femoral head to pressurize the proximal femur through the movement of the semi-threaded screw toward the proximal femur; but because each screw in the above fixation device is only connected to the femoral neck, each screw is prone to slide along its own axis during the subsequent recovery of the femoral neck, thereby causing the patient to experience femoral neck shortening, which in turn causes the patient's thigh abductor muscle to shorten its force arm, which has a greater adverse effect on the patient's physical function. Summary of the invention

[0004] In order to at least solve the problem that the fixation device in the related art does not have anti-sliding properties, the present invention provides a femoral neck fracture fixation device, which has anti-sliding properties as well as the advantages of angular stability and pressurization of the fracture line.

[0005] The present invention provides a femoral neck fracture fixation device, which comprises a mounting base, a pressurized anti-slip sleeve, a pressurized screw and two reinforcing screws; the mounting base is provided with a pressurized screw hole and two mounting holes; the outer wall of the pressurized anti-slip sleeve is provided with a pressurized external thread for screwing with the pressurized screw hole, and the inner wall is provided with a pressurized internal thread with a spiral direction opposite to that of the pressurized external thread; the pressurized screw is a semi-threaded screw, and the outer periphery of its nut is provided with a thread for screwing with the pressurized internal thread, the bolt of the pressurized screw is used to extend from the proximal end of the fractured femur to the femoral head through the anti-slip sleeve screwed with the pressurized screw hole, so as to pressurize and fix the femoral neck; the bolts of the two reinforcing screws are used to extend from the proximal end of the fractured femur to the femoral head through the two mounting holes respectively, so as to reinforce the fixation of the femoral neck by the pressurized screw.

[0006] Compared with the prior art, the above technical solution of the present invention produces at least the following beneficial technical effects:

[0007] On the first aspect, the embodiment of the present invention achieves that the pressure screw is fastened in the pressure anti-slip sleeve by screwing the nut of the pressure screw with the inner wall of the pressure anti-slip sleeve, so that during the subsequent recovery of the femoral neck fracture, the pressure screw will not slide relative to the pressure anti-slip sleeve, for example, it will not move along its own axial direction; on this basis, the outer wall of the pressure anti-slip sleeve is screwed with the pressure screw hole in the mounting base plate, so that the pressure anti-slip sleeve is fastened in the pressure screw hole, and the mounting base plate is fixed to the femoral side. Therefore, during the subsequent recovery of the femoral neck fracture, the pressure anti-slip sleeve will not move along its own axial direction; thereby effectively preventing the pressure screw from moving along its own axial direction during the subsequent recovery of the femoral neck, and effectively avoiding the phenomenon of shortening of the femoral neck and the shortening of the force arm of the patient's thigh abductor muscles due to the axial movement of the pressure screw.

[0008] Secondly, the embodiment of the present invention arranges the threads on the outer wall of the pressurized anti-slip sleeve to be in opposite directions to the threads on its inner wall, and the pressurized screw is a semi-threaded screw. This allows the pressurized anti-slip sleeve to remain relatively still with the pressurized screw during the process of withdrawing from the pressurized screw hole along its own axial direction, thereby driving the pressurized screw to move in the same direction, so that the threaded portion of the pressurized screw drives the femoral head to move toward the femoral neck fracture line, thereby effectively achieving pressurized fixation of the femoral neck.

[0009] On the third aspect, the embodiment of the present invention utilizes two reinforcement screws to extend from the proximal end of the fractured femur to the femoral head through two mounting holes respectively. This can, while reinforcing the fixation of the femoral neck by the compression screws, avoid the situation where there are too few support points for the femoral head due to fixation of the femoral neck by only one compression screw, which in turn causes the femoral head to easily shake up and down in the longitudinal direction.

[0010] In summary, the femoral neck fracture fixation device of the present invention has good anti-sliding properties and also has the advantages of angular stability and pressurization of the fracture line.

[0011] Optionally, the length of the pressurized anti-slip sleeve is greater than the length of the pressurized screw hole.

[0012] By setting the length of the pressurized anti-slip sleeve to be greater than the length of the pressurized screw hole, the withdrawal stroke of the pressurized anti-slip sleeve can be better adjusted, thereby achieving adjustment of the pressurizing intensity and meeting more pressurization requirements.

[0013] Optionally, when the compression screw fixes the femoral neck, its axis is perpendicular to the fracture line of the femoral neck; when two reinforcement screws fix the femoral neck, the axes of the two reinforcement screws are parallel to the axis of the femoral neck.

[0014] By limiting the axis of the compression screw to be perpendicular to the fracture line of the femoral neck, it is helpful to improve the uniformity of the compression of the femoral neck by the compression screw, further improve the compression effect and enhance the fracture healing effect. On this basis, by simultaneously limiting the axes of the two reinforcement screws to be parallel to the axis of the femoral neck, the support force of the two reinforcement screws on the femoral head can be balanced, so that the support force on the femoral head is more uniform, which is helpful to improve the stability of the three screws supporting the femur and further enhance the angular stability of the entire device.

[0015] Optionally, the femoral neck fracture fixation device also includes two reinforced anti-slip sleeves corresponding one to one with the two mounting holes; the two mounting holes are both screw hole structures; the outer wall of any reinforced anti-slip sleeve is provided with a reinforced external thread for screwing into the corresponding mounting hole, and the inner wall is provided with a reinforced internal thread in the opposite direction of the spiral direction of the reinforced external thread; the outer periphery of the nut of any reinforcing screw is provided with a thread for screwing into the reinforced internal thread.

[0016] By adding two reinforced anti-slip sleeves, adaptively adjusting the two mounting holes to a screw hole structure, and limiting the two reinforced anti-slip sleeves according to the principle of a pressurized anti-slip sleeve, the two reinforced screws can be effectively prevented from sliding along their own axis during the subsequent recovery of the femoral neck, thereby further improving the anti-slip property of the entire device, and better avoiding the phenomenon of shortening of the femoral neck and the force arm of the patient's thigh abductor muscles caused by axial movement of the screws.

[0017] Optionally, the two reinforcement screws are both semi-threaded screws.

[0018] By adding two reinforcing anti-slip sleeves and further setting the two reinforcing screws as semi-threaded screws, it can be achieved that when the reinforcing screw is screwed from the proximal end of the femur to the femoral head, the reinforcing anti-slip sleeve can remain relatively still with the reinforcing screw during the process of withdrawing the reinforcing screw hole along its own axial direction, thereby driving the reinforcing screw to move in the same direction, so that the threaded part of the reinforcing screw drives the femoral head to move toward the femoral neck fracture line. This is beneficial to further enhance the pressurized fixation of the femoral neck through the reinforcing screw on the basis of the compression screw, thereby further improving the pressurization performance of the entire device.

[0019] Optionally, the length of any reinforced anti-slip sleeve is greater than the length of the corresponding mounting hole.

[0020] By setting the length of the reinforced anti-slip sleeve to be greater than the length of the mounting hole, the withdrawal stroke of the reinforced anti-slip sleeve can be better adjusted, thereby achieving adjustment of the pressurizing intensity, which can meet more pressurizing requirements.

[0021] Optionally, the two mounting holes are adjacent to each other and are spaced apart, and the pressurized screw hole is disposed outside one side of the space between the two mounting holes.

[0022] By limiting the positions of the two mounting holes and the pressurized screw hole, the three screw holes are distributed in a triangular structure, which can further balance the supporting force of the screws at each screw hole on the femoral head.

[0023] Optionally, there are two mounting substrates, namely a first mounting substrate and a second mounting substrate; the first mounting substrate is applied to Pauwels type 3 fracture, and its pressurized screw hole is arranged above the gap between the two mounting holes; the second mounting substrate is applied to Pauwels type 1 and Pauwels type 2 fractures, and its pressurized screw hole is arranged below the gap between the two mounting holes.

[0024] By setting mounting substrates of different specifications according to different types of femoral neck fractures, it is possible to use a more suitable mounting substrate according to the fracture type in actual applications to better fix the femoral neck fracture, thereby further enhancing the practicality of the device.

[0025] Optionally, the femoral neck fracture fixation device also includes a fixing screw; the mounting base plate is also provided with a fixing hole; the fixing screw is used to extend into the femur below the femoral neck through the fixing hole to reinforce the installation of the mounting base plate on the femoral side.

[0026] By adding fixing screws and fixing holes, the stability of the mounting plate on the femoral side can be increased.

[0027] Optionally, an end surface of one end of the pressurized anti-slip sleeve is provided with a connecting groove or a connecting protrusion.

[0028] By setting a connecting groove or a connecting protrusion on one end surface of the pressurized anti-slip sleeve, the pressurized anti-slip sleeve can be rotated by a screwdriver matching the connecting groove or the connecting protrusion, which is conducive to facilitating the operation of screwing the pressurized anti-slip sleeve into the pressurized screw hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a side structural schematic diagram of a femoral neck fracture fixation device according to an exemplary embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the front view of a femoral neck fracture fixation device according to an exemplary embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the main structure of a pressurized anti-slip sleeve according to an exemplary embodiment of the present invention;

[0032] Figure 4 is a side structural cross-sectional view of a pressurized anti-slip sleeve according to an exemplary embodiment of the present invention;

[0033] Figure 5 is a partial perspective view of a front view of a femoral neck of a Pauwels type 3 fracture after being fixed by a femoral neck fracture fixation device according to an exemplary embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of the main structure of another pressurized anti-slip sleeve according to an exemplary embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of the front view of another femoral neck fracture fixation device according to an exemplary embodiment of the present invention;

[0036] Figure 8 is a schematic diagram of the front view of another femoral neck fracture fixation device according to an exemplary embodiment of the present invention;

[0037] Fig. 9 The femoral neck of a Pauwels type 3 fracture shown in the present invention according to an exemplary embodiment is composed of Figure 8 The partial perspective view of the front view of the femoral neck fracture fixation device after fixation. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments, and they are only examples consistent with some aspects of the present invention as detailed in the attached claims. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. "First", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connect" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The singular forms of "a", "said" and "the" can also include plural forms, unless the context clearly indicates other meanings. "And / or" refers to any or all possible combinations of one or more associated listed items. The directions or positional relationships indicated by “upper”, “lower”, “inside”, “outside”, etc. are based on the directions or positional relationships shown in the drawings, or are the directions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0040] In order to at least solve the problem that the fixation device in the related art does not have anti-sliding property, the present invention provides a femoral neck fracture fixation device, such as Figures 1 to 4 As shown, the device comprises a mounting base plate 11, a pressurized anti-slip sleeve 12, a pressurized screw 13 and two reinforcing screws (14 and 15); the mounting base plate 11 is provided with a pressurized screw hole 111 and two mounting holes (112 and 113); the outer wall of the pressurized anti-slip sleeve 12 is provided with a pressurized external thread 122 for screwing with the pressurized screw hole 111, and the inner wall is provided with a pressurized internal thread 121 with a spiral direction opposite to that of the pressurized external thread 122; the pressurized screw 1 3 is a semi-threaded screw, and the outer periphery of the nut is provided with a thread for screwing with the pressurized internal thread 121. The bolt of the pressurized screw 13 is used to extend from the proximal end of the fractured femur to the femoral head through the anti-slip sleeve screwed into the pressurized screw hole 111, so as to pressurize and fix the femoral neck; the bolts of the two reinforcing screws (14 and 15) are used to extend from the proximal end of the fractured femur to the femoral head through the two mounting holes (112 and 113) respectively, so as to reinforce the fixation of the femoral neck by the pressurized screw 13.

[0041] The following is an explanation of the method for using the above device. For the convenience of description, the side of the mounting base 11 used to fit the side of the femur is called the inner side, and the other side opposite and parallel to the mounting side is called the outer side; the end of the pressurized anti-slip sleeve 12 extending into the pressurized screw hole 111 is called the insertion end, and the other end opposite to the insertion end is called the operating end. Based on this, the method for using may include the following steps:

[0042] In step S01, the inner side surface of the mounting base plate 11 is placed in contact with the side surface of the femur;

[0043] In step S02, by applying a first rotation operation to the pressurized anti-slip sleeve 12, the pressurized anti-slip sleeve 12 is extended from the outer side surface toward the inner side surface of the mounting substrate 11 and screwed into the pressurized screw hole 111 of the mounting substrate 11 until the operating end surface of the pressurized anti-slip sleeve 12 is flush with the outer side surface of the mounting substrate 11;

[0044] In step S03, when the operating end surface of the pressurized anti-slip sleeve 12 is flush with the outer side surface of the mounting substrate 11, the first rotation operation is stopped and the pressurized anti-slip sleeve 12 is fixed;

[0045] In step S04, after the pressurized anti-slip sleeve 12 is fixed, the pressurized screw 13 is inserted into the pressurized anti-slip sleeve 12, and when the outer periphery of the nut of the pressurized screw 13 contacts the pressurized anti-slip sleeve 12, a second rotation operation is applied to the pressurized screw 13, so that the nut of the pressurized screw 13 is inserted into and screwed into the pressurized internal thread 121 of the pressurized anti-slip sleeve 12, so that the pressurized screw 13 is inserted from the proximal end of the fractured femur to the femoral head; wherein the rotation direction of the second rotation operation is opposite to the rotation direction of the first rotation operation, and during the second rotation operation, the pressurized anti-slip sleeve 12 is in a stationary state;

[0046] In step S05, after the pressurizing screw 13 is screwed into the pressurizing internal thread 121, the third rotation operation is applied to the pressurizing anti-slip sleeve 12, so that the operating end face of the pressurizing anti-slip sleeve 12 is withdrawn to the outside of the outer side surface of the mounting base plate 11, and the pressurizing screw 13 screwed into the pressurizing anti-slip sleeve 12 is withdrawn to the outside of the outer side surface of the mounting base plate 11 along with the movement of the pressurizing anti-slip sleeve 12, so that the pressurizing screw 13 drives the femoral head to pressurize the fracture line of the femoral neck, so as to pressurize and fix the femoral neck; wherein the rotation direction of the third rotation operation is opposite to the rotation direction of the first rotation operation;

[0047] In step S06, after the pressure screw 13 pressurizes and fixes the femoral neck, the two reinforcement screws (14 and 15) are respectively inserted into the corresponding mounting holes, and the bolt parts of the two reinforcement screws (14 and 15) are screwed from the proximal end of the femur into the femoral head to reinforce the femoral neck.

[0048] Thus, through steps S01 to S06, the fractured femoral neck can be reinforced and restored. Taking the fixation of Pauwels type 3 femoral neck fracture as an example, Figure 5 As shown in the figure, the part indicated by the label A is the proximal end of the femur, the part indicated by the label B is the femoral head, and the part indicated by the label C is the fracture line. Based on the above technical solution, the embodiment of the present invention produces at least the following beneficial technical effects:

[0049] On the one hand, the embodiment of the present invention achieves that the pressure screw 13 is fastened in the pressure anti-slip sleeve 12 by screwing the nut of the pressure screw 13 with the inner wall of the pressure anti-slip sleeve 12, so that during the subsequent recovery of the femoral neck fracture, the pressure screw 13 will not slide relative to the pressure anti-slip sleeve 12, for example, it will not move along its own axial direction; on this basis, the outer wall of the pressure anti-slip sleeve 12 is screwed with the pressure screw hole 111 in the mounting base plate 11, so that the pressure anti-slip sleeve 12 is fastened in the pressure screw hole 111, and the mounting base plate 11 is fixed to the femoral side. Therefore, during the subsequent recovery of the femoral neck fracture, the pressure anti-slip sleeve 12 will not move along its own axial direction; thereby effectively preventing the pressure screw 13 from moving along its own axial direction during the subsequent recovery of the femoral neck, and effectively avoiding the phenomenon that the patient's femoral neck shortening and the shortening of the force arm of the patient's thigh abductor muscles caused by the axial movement of the pressure screw 13 are caused.

[0050] Secondly, the embodiment of the present invention arranges the threads on the outer wall of the pressurized anti-slip sleeve 12 to be in opposite directions to the threads on its inner wall, and the pressurized screw 13 is a semi-threaded screw. This allows the pressurized anti-slip sleeve 12 to remain relatively still with the pressurized screw 13 during the process of withdrawing the pressurized screw hole 111 along its own axial direction, thereby driving the pressurized screw 13 to move in the same direction, so that the threaded portion of the pressurized screw 13 drives the femoral head to move toward the femoral neck fracture line, thereby effectively achieving pressurized fixation of the femoral neck.

[0051] On the third aspect, the embodiment of the present invention utilizes two reinforcing screws (14 and 15) to extend from the proximal end of the fractured femur to the femoral head through two mounting holes (112 and 113), respectively. This can reinforce the fixation of the femoral neck by the compression screw 13 while avoiding the situation where there are too few support points for the femoral head due to fixation of the femoral neck by only one compression screw 13, thereby causing the femoral head to easily shake up and down in the longitudinal direction.

[0052] In summary, the femoral neck fracture fixation device of the present invention has good anti-sliding properties and also has the advantages of angular stability and pressurization of the fracture line.

[0053] In one embodiment, the pressurized external thread 122 of the pressurized anti-slip sleeve 12 may be a counterclockwise thread, and correspondingly, the pressurized internal thread 121 may be a clockwise thread; based on this, the first rotation operation is a counterclockwise rotation operation, and the second rotation operation and the third rotation operation are both clockwise rotation operations. In another embodiment, the pressurized external thread 122 of the pressurized anti-slip sleeve 12 may be a clockwise thread, and correspondingly, the pressurized internal thread 121 may be a counterclockwise thread; based on this, the first rotation operation is a clockwise rotation operation, and the second rotation operation and the third rotation operation are both counterclockwise rotation operations.

[0054] In order to facilitate the rotation operation of the pressurized anti-slip sleeve 12, in one embodiment, a rotation structure for matching and connecting with a rotating tool can be provided on the operating end surface of the pressurized anti-slip sleeve 12. For example, the operating end surface of the pressurized anti-slip sleeve 12 can be provided with a connecting groove or a connecting protrusion. Figure 6 As shown, the pressurized anti-slip sleeve 12 can be rotated using a screwdriver with a corresponding protrusion structure on the blade.

[0055] In order to reduce the difficulty of the fixing operation of the pressurized anti-slip sleeve 12 in step S03 while ensuring that the pressurized screw 13 can be smoothly inserted into the pressurized anti-slip sleeve 12 in step S04, in one embodiment, a hollow screwdriver matching the pressurized anti-slip sleeve 12 can be used to perform a first rotation operation on the pressurized anti-slip sleeve 12, and after the first rotation operation is completed, the hollow screwdriver connected to the pressurized anti-slip sleeve 12 is fixed by hand or by a fixing device for fixing the hollow screwdriver, so that the pressurized anti-slip sleeve 12 is fixed by fixing the hollow screwdriver, thereby facilitating the fixing operation of the pressurized anti-slip sleeve 12, and at the same time allowing the pressurized screw 13 to directly enter the pressurized anti-slip sleeve 12 through the hollow hole of the hollow screwdriver, thereby ensuring the smooth entry of the pressurized screw 13.

[0056] In order to facilitate better adjustment of the withdrawal stroke of the pressurized anti-slip sleeve 12 and thereby achieve adjustment of the pressurizing intensity to meet more pressurizing requirements, in one embodiment, for the femoral neck fracture fixation device, the length of the pressurized anti-slip sleeve 12 is greater than the length of the pressurized screw hole 111.

[0057] In order to further enhance the angular stability of the femoral neck fracture fixation device, in one embodiment, when the pressure screw 13 fixes the femoral neck, its axis is perpendicular to the fracture line of the femoral neck; when the two reinforcing screws (14 and 15) fix the femoral neck, the axes of the two reinforcing screws (14 and 15) are parallel to the axis of the femoral neck. Thus, by limiting the axis of the pressure screw 13 to be perpendicular to the fracture line of the femoral neck, it is beneficial to improve the uniformity of the pressure screw 13 on the femoral neck, further improve the pressure effect and enhance the fracture healing effect. On this basis, by simultaneously limiting the axes of the two reinforcing screws (14 and 15) to be parallel to the axis of the femoral neck, the support force of the two reinforcing screws (14 and 15) on the femoral head can be balanced, so that the support force on the femoral head is more uniform, which is beneficial to improve the stability of the three screws supporting the femur, and further enhance the angular stability of the entire device.

[0058] Based on the above embodiment, the method of use also needs to be adaptively adjusted: in step S04, when the compression screw 13 is screwed into the compression internal thread 121, the axis of the compression screw 13 is perpendicular to the fracture line; in step S06, when any reinforcement screw is screwed from the proximal end of the femur to the femoral head, the axis of the reinforcement screw is parallel to the axis of the femoral neck. Figure 5 As shown, for Pauwels type 3 femoral neck fracture, the axis of the compression screw 13 is perpendicular to the fracture line, while the axis of the reinforcement screw is parallel to the femoral neck axis. However, for Pauwels type 1 or Pauwels type 2 femoral neck fracture, since the fracture line is almost perpendicular to the femoral neck axis, the axes of the compression screw 13 and the two reinforcement screws (14 and 15) can be considered to be parallel to the femoral neck axis.

[0059] To further enhance the anti-sliding property of the femoral neck fracture fixation device, in one embodiment, Figure 7 As shown, the femoral neck fracture fixation device also includes two reinforced anti-slip sleeves (16 and 17) corresponding to the two mounting holes (112 and 113) one by one; the two mounting holes (112 and 113) are both screw hole structures; the outer wall of any reinforced anti-slip sleeve is provided with a reinforced external thread for screwing with the corresponding mounting hole, and the inner wall is provided with a reinforced internal thread in the opposite direction of the spiral direction of the reinforced external thread; the outer periphery of the nut of any reinforcing screw is provided with a thread for screwing with the reinforced internal thread. Therefore, by adding two reinforced anti-slip sleeves (16 and 17), adaptively adjusting the two mounting holes (112 and 113) to a screw hole structure, and limiting the two reinforced anti-slip sleeves (16 and 17) according to the principle of the pressurized anti-slip sleeve 12, the two reinforced screws (14 and 15) can be effectively prevented from sliding along their own axis during the subsequent recovery of the femoral neck, further improving the anti-slip property of the entire device, and better avoiding the phenomenon of shortening of the femoral neck of the patient due to the axial movement of the screws, thereby shortening the force arm of the patient's thigh abductor muscles.

[0060] Based on the previous embodiment, the method of use also needs to be adaptively adjusted. For the convenience of description, the end of the reinforced anti-slip sleeve extending into the pressurized screw hole 111 is called the entry end, and the other end opposite to the entry end is called the controlled end. The adjustment of the method of use includes the following:

[0061] In step S06, the two reinforcing screws (14 and 15) are respectively inserted into the corresponding mounting holes, and the bolt parts of the two reinforcing screws (14 and 15) are screwed into the femoral head from the proximal end of the femur to achieve the reinforcement of the femoral neck, which may include:

[0062] In step S061, for any one of the reinforcement anti-slip sleeves, a fourth rotation operation is applied to the reinforcement anti-slip sleeve, so that the reinforcement anti-slip sleeve is extended from the outer side surface toward the inner side surface of the mounting substrate 11 and screwed into the corresponding mounting hole until the controlled end surface of the reinforcement anti-slip sleeve is flush with the outer side surface of the mounting substrate 11;

[0063] In step S062, when the controlled end surface of the reinforced anti-slip sleeve is flush with the outer surface of the mounting substrate 11, the fourth rotation operation is stopped and the reinforced anti-slip sleeve is fixed;

[0064] In step S063, for any reinforcement screw, after fixing the reinforcement anti-slip sleeve, the reinforcement screw is inserted into the corresponding reinforcement anti-slip sleeve, and when the outer periphery of the nut of the reinforcement screw contacts the reinforcement anti-slip sleeve, the fifth rotation operation is applied to the reinforcement screw so that the nut of the reinforcement screw is inserted into and screwed into the reinforcement internal thread of the reinforcement anti-slip sleeve, so as to enable the reinforcement screw to be extended from the proximal end of the fractured femur to the femoral head; wherein, the rotation direction of the fifth rotation operation is opposite to the rotation direction of the fourth rotation operation, and during the fifth rotation operation, the reinforcement anti-slip sleeve is in a stationary state.

[0065] In order to further enhance the pressurization performance of the femoral neck fracture fixation device, in one embodiment, based on the previous embodiment, the two reinforcing screws (14 and 15) are both semi-threaded screws. Therefore, by further setting the two reinforcing screws (14 and 15) as semi-threaded screws on the basis of adding two reinforcing anti-slip sleeves (16 and 17), it can be achieved that when the reinforcing screw is screwed into the femoral head from the proximal end of the femur, the reinforcing anti-slip sleeve can be operated to withdraw from the reinforcing screw hole along its own axial direction, and it can remain relatively still with the reinforcing screw, thereby driving the reinforcing screw to move in the same direction, so that the threaded part of the reinforcing screw drives the femoral head to move in the direction of the femoral neck fracture line, thereby on the basis of the pressurization screw 13, it is beneficial to further enhance the pressurization fixation of the femoral neck through the reinforcing screw, and further improve the pressurization performance of the entire device.

[0066] Based on the previous embodiment, the method of use also needs to be adaptively adjusted: in the step S06, the step of respectively extending the two reinforcing screws (14 and 15) into the corresponding mounting holes, and screwing the bolt parts of the two reinforcing screws (14 and 15) from the proximal end of the femur into the femoral head to achieve the step of reinforcing the femoral neck, in addition to steps S061 to S063, may also include:

[0067] In step S064, after the reinforcement screw is screwed into the reinforcement internal thread, the sixth rotation operation is applied to the reinforcement anti-slip sleeve, so that the controlled end face of the reinforcement anti-slip sleeve is withdrawn to the outside of the outer surface of the mounting substrate 11, and the reinforcement screw screwed into the reinforcement anti-slip sleeve is withdrawn to the outside of the outer surface of the mounting substrate 11 along with the movement of the reinforcement anti-slip sleeve, so that the reinforcement screw drives the femoral head to pressurize the fracture line of the femoral neck to pressurize and fix the femoral neck; wherein, the rotation direction of the sixth rotation operation is opposite to the rotation direction of the fourth rotation operation.

[0068] In the above, the reinforced external thread of the reinforced anti-slip sleeve may be a counterclockwise thread, and correspondingly, the reinforced internal thread may be a clockwise thread; based on this, the fourth rotation operation is a counterclockwise rotation operation, and the fifth and sixth rotation operations are both clockwise rotation operations. In another embodiment, the reinforced external thread of the reinforced anti-slip sleeve may be a clockwise thread, and correspondingly, the reinforced internal thread may be a counterclockwise thread; based on this, the fourth rotation operation is a clockwise rotation operation, and the fifth and sixth rotation operations are both counterclockwise rotation operations.

[0069] In order to facilitate better adjustment of the withdrawal stroke of the reinforced anti-slip sleeve and thus achieve adjustment of the pressurizing intensity to meet more pressurizing requirements, in one embodiment, based on the previous embodiment, the length of any reinforced anti-slip sleeve is greater than the length of the corresponding mounting hole.

[0070] In one embodiment, in order to reduce the manufacturing difficulty of each anti-slip sleeve and avoid the problem that the pressurized anti-slip sleeve 12 and the reinforced anti-slip sleeve have different structures, which may cause misidentification during use and thus affect the accurate operation during use, the pressurized anti-slip sleeve 12 and the reinforced anti-slip sleeves have the same structure, wherein the same structure includes the same size, the same inner wall thread structure and the same outer wall thread structure, but is not limited to this.

[0071] In order to further balance the supporting force of the screws at each screw hole on the femoral head, in one embodiment, Figure 2 As shown, the two mounting holes (112 and 113) are adjacent and spaced apart, and the pressurizing screw hole 111 is disposed outside one side of the space between the two mounting holes (112 and 113).

[0072] Based on the above embodiment, in order to make the femoral neck fracture fixation device more suitable for different types of femoral neck fractures, in one embodiment, the mounting substrate may be provided with two, namely a first mounting substrate and a second mounting substrate. The first mounting substrate is applied to Pauwels type 3 fracture, and its pressurized screw hole is arranged above the interval between the two mounting holes, such as Figure 2 As shown. The second mounting substrate is applied to Pauwels type 1 and Pauwels type 2 fractures, and the pressurized screw hole is arranged below the interval between the two mounting holes. Thus, by setting mounting substrates of different specifications according to different types of femoral neck fractures, it is possible to use a more suitable mounting substrate according to the fracture type in actual applications to better fix the femoral neck fracture, thereby further enhancing the practicality of the device.

[0073] In one embodiment, to increase the stability of the mounting plate on the femoral side, as Figure 8 As shown, the femoral neck fracture fixation device also includes a fixing screw 19; the mounting base plate 11 is also provided with a fixing hole; the fixing screw 19 is used to extend into the femur below the femoral neck through the fixing hole to reinforce the installation of the mounting base plate 11 on the femoral side.

[0074] Based on the previous embodiment, the method of use also needs to be adaptively adjusted: the method of use may further include the following steps:

[0075] In step S07, the fixing screw 19 is inserted into the fixing hole, and the bolt portion of the fixing screw 19 is screwed into the femur to achieve a stable installation of the mounting base 11. Thus, after the operations of steps S01 to S07, the fixed femoral neck is as follows: Fig. 9 shown.

[0076] In one embodiment, based on the previous embodiment, the fixing screws 19 can be set to be multiple according to the fixing requirements of the mounting substrate, for example, two fixing screws can be provided, and accordingly, the mounting substrate 11 is provided with two fixing holes, and the two fixing holes are sequentially arranged at intervals along the length direction of the mounting substrate 11. Therefore, when the mounting substrate 11 is attached to the femoral side, two fixing screws can be respectively passed through the two fixing holes, arranged along the femoral shaft direction, and respectively extended into the femoral shaft, so as to realize the reinforcement of the mounting substrate 11.

[0077] In the above, the fixing screw may be a non-locking screw or a locking screw.

[0078] Based on an embodiment in which the femoral neck fracture fixation device includes a first mounting substrate, a second mounting substrate and a fixing screw, in another embodiment, in order to avoid the phenomenon that all the holes are concentrated on one side of the mounting plate, which causes the mounting plate to be subjected to excessive force concentration, is prone to deformation and has affected the mounting stability, for the first mounting substrate, the pressurized screw hole, the two mounting holes and the fixing hole are arranged in sequence at intervals along the length direction of the mounting substrate; for the second mounting substrate, the two mounting holes, the pressurized screw hole and the fixing hole are arranged in sequence at intervals along the length direction of the mounting substrate.

[0079] In one embodiment, in order to ensure the firmness and toughness of the mounting substrate 11 and to avoid deformation of the mounting substrate 11 and affecting the healing effect of the femoral neck, the mounting substrate 11 is a medical metal material substrate with high rigidity, for example, a stainless steel plate or a titanium alloy steel plate.

[0080] It should be noted that, according to actual needs, two or more of all the embodiments provided in the present invention can be combined to solve two or more corresponding technical problems; and the various technical features in the above implementation modes can be combined arbitrarily, as long as there is no conflict or contradiction between the combinations of the features, but due to space limitations, they are not described one by one.

[0081] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any other embodiments that can be easily conceived or replaced by any technician familiar with the technical field of the present invention within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A femoral neck fracture fixation device, characterized in that: The invention comprises a mounting base plate, a pressurized anti-slip sleeve, a pressurized screw and two reinforcing screws; the mounting base plate is provided with a pressurized screw hole and two mounting holes; the outer wall of the pressurized anti-slip sleeve is provided with a pressurized external thread for screwing with the pressurized screw hole, and the inner wall is provided with a pressurized internal thread opposite to the spiral direction of the pressurized external thread; the pressurized screw is a semi-threaded screw, and the outer periphery of its nut is provided with a thread for screwing with the pressurized internal thread, the bolt of the pressurized screw is used to extend from the proximal end of the fractured femur to the femoral head through the anti-slip sleeve screwed with the pressurized screw hole, so as to pressurize and fix the femoral neck; the bolts of the two reinforcing screws are used to extend from the proximal end of the fractured femur to the femoral head through the two mounting holes respectively, so as to reinforce the fixation of the femoral neck by the pressurized screw; It also includes two reinforced anti-slip sleeves corresponding to the two mounting holes one by one; the two mounting holes are both screw hole structures; the outer wall of any reinforced anti-slip sleeve is provided with a reinforced external thread for screwing with the corresponding mounting hole, and the inner wall is provided with a reinforced internal thread with a spiral direction opposite to the reinforced external thread; the outer periphery of the nut of any reinforced screw is provided with a thread for screwing with the reinforced internal thread.

2. The femoral neck fracture fixation device according to claim 1, characterized in that: The length of the pressurized anti-slip sleeve is greater than the length of the pressurized screw hole.

3. The femoral neck fracture fixation device according to claim 1, characterized in that: When the compression screw fixes the femoral neck, its axis is perpendicular to the fracture line of the femoral neck; when two reinforcement screws fix the femoral neck, the axes of the two reinforcement screws are parallel to the axis of the femoral neck.

4. The femoral neck fracture fixation device according to claim 1, characterized in that: The two reinforcing screws are both half-threaded screws.

5. The femoral neck fracture fixation device according to claim 4, characterized in that: The length of any reinforced anti-slip sleeve is greater than the length of the corresponding mounting hole.

6. The femoral neck fracture fixation device according to any one of claims 1 to 5, characterized in that: The two mounting holes are adjacent to each other and are spaced apart, and the pressurized screw hole is arranged outside one side of the space between the two mounting holes.

7. The femoral neck fracture fixation device according to claim 1, characterized in that: There are two mounting substrates, namely a first mounting substrate and a second mounting substrate; the first mounting substrate is applied to Pauwels type 3 fractures, and its pressurized screw hole is arranged above the interval between the two mounting holes; the second mounting substrate is applied to Pauwels type 1 and Pauwels type 2 fractures, and its pressurized screw hole is arranged below the interval between the two mounting holes.

8. The femoral neck fracture fixation device according to claim 1, characterized in that: It also includes a fixing screw; the mounting base plate is also provided with a fixing hole; the fixing screw is used to extend into the femur below the femoral neck through the fixing hole to reinforce the mounting of the mounting base plate on the femoral side.

9. The femoral neck fracture fixation device according to claim 1, characterized in that: One end surface of the pressurized anti-slip sleeve is provided with a connecting groove or a connecting protrusion.

Images