Sleeve combined type tension pressurizing internal fixing screw

Abstract

The invention provides a sleeve combined type tension pressurization internal fixation screw, and belongs to the technical field of medical devices. Comprising an outer screw sleeve, an inner core fixing screw is slidably connected to an inner cavity of the outer screw sleeve, and an arc-shaped sleeve plate is fixedly connected to the middle of the inner cavity of the outer screw sleeve; and the limiting and locking assembly is used for shortening the distance between the outer screw sleeve and the two ends of the fracture, and the limiting and locking assembly is connected with the outer screw sleeve. Through the limiting locking assembly, sliding of the inner core fixing screw is facilitated, the sliding resistance of the inner core fixing screw is reduced, in the state, the inner core fixing screw is in the most stable state, different distances can be selected according to the severity degree of the fracture broken end, and therefore different pressurization effects are changed, and the fracture broken end is more stable. The holding force of the inner core fixing screw at the fracture broken end is greatly improved, and therefore it is ensured that the inner core fixing screw can exert the pressurizing effect on the fracture broken end.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a sleeve-assembled tension-pressurized internal fixing screw. Background Art

[0002] In modern orthopedic medicine, screws have become essential implants for almost every operation. Traditional screws are divided into full screws and half screws. The screws fix the two ends of the fracture and pass through the double-layer cortical bone to fix the fracture ends. At the same time, the rotation between the tail screw and the tip can reduce the distance between the fracture ends, thereby generating pressure on the fracture ends, that is, compression.

[0003] However, in actual use, for patients with bone loss or bone loss, the bone density is lower than that of normal people, and in daily life, the bone cortex will become thinner and the bone density will become sparse, that is, the physical strength of the bone will decrease. When using internal fixation screws to fix fractures, the tip of the ordinary screw is fixed in the fracture area, and the patient's bone density is low, which will cause the contact area between the tip of the screw and the bone to loosen, and the bone's wrapping of the screw is reduced, which can easily cause the screw to loosen during the fixation process. Even when the patient moves, the screw will be displaced as the bone swings, which greatly reduces the screw's holding force on the fracture ends, resulting in the ordinary screw failing to pressurize the fracture ends.

[0004] Therefore, the present invention provides a sleeve-assembled tension-pressurized internal fixation screw to meet the demand. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a sleeve-combined tension-pressurized internal fixation screw to solve the problem that the tip of the existing ordinary screw is fixed in the fracture area, and the patient's bone density is low, which will cause the contact area between the screw tip and the bone to loosen, and the bone's wrapping of the screw is reduced, which can easily cause the screw to loosen during the fixation process, and even when the patient moves, the screw will be dislocated with the swing of the bone, which greatly reduces the holding force of the screw on the fracture end, thereby causing the ordinary screw to fail to pressurize the fracture end.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A sleeve-combined tension-pressurized internal fixing screw comprises an outer screw sleeve, the inner cavity of the outer screw sleeve is slidably connected to an inner core fixing screw, the middle part of the top end of the inner core fixing screw is fixedly connected to a telescopic rod, and the middle part of the inner cavity of the outer screw sleeve is fixedly connected to an arc-shaped sleeve plate; a limit locking assembly, the limit locking assembly is used to shorten the distance between the outer screw sleeve and the two ends of the fracture, and the limit locking assembly is connected to the outer screw sleeve.

[0008] Optionally, the limit lock includes a limit portion 1 opened at the bent end of the arc sleeve, a limit portion 2 opened at the lower bent end of the arc sleeve, and a correction block is fixedly connected to the inner cavity of the outer screw sleeve near the end of the arc sleeve.

[0009] Optionally, the outer screw sleeve is fixedly connected with an adapter block near the inner cavity of the correction block, the upper curved end of the adapter block is provided with a snap-in groove, and the outer screw sleeve is fixedly connected with a U-shaped limit block near the inner cavity of the adapter block.

[0010] Optionally, a U-shaped clamping plate is clamped on the outer surface of the top of the inner core fixing screw, a protective plate is fixedly connected to the side of the curved end of the U-shaped clamping plate, and a buffer arc pad is fixedly connected to the bottom of the protective plate.

[0011] Optionally, an elastic sheet is fixedly connected to the inner cavity of the lower curved end of the U-shaped clamping plate, a weakened portion is provided at the lower curved end of the U-shaped clamping plate close to the elastic sheet, and a hollow frame is fixedly connected to the top end of the inner core fixing screw.

[0012] Optionally, an active rubber plug is fixedly connected to the inner surface of the telescopic rod near the top end of the outer screw sleeve, and a blocking piece is fixedly connected to the middle of the bottom end of the active rubber plug.

[0013] Optionally, the arc-shaped sleeve is made of plastic and has a hollow inner cavity, the limiting portion one and the limiting portion two are laterally symmetrically distributed through the middle of the arc-shaped sleeve, the end of the correction block away from the inner wall of the outer screw sleeve is arc-shaped, and a transverse groove is provided in the middle of the arc.

[0014] Optionally, the length of the snap-in slot is half of the length of the adapter block, the U-shaped limit block is made of plastic, and the upper and lower curved ends are provided with hooks.

[0015] Optionally, the opposite surface of the U-shaped clamping plate and the inner core fixing screw are fixedly connected to the inner cavity of the outer screw sleeve, the upper and lower curved ends of the U-shaped clamping plate are set to be hollow, the contact end of the buffer arc pad and the protective plate is flat, and its opposite surface is an arc convex outward, and the inside is hollow.

[0016] Optionally, the elastic sheet is fixedly connected to the inner cavity of the lower curved end of the U-shaped clamping plate, the middle part of the hollow frame is hollow, and the shape of the hollow frame is adapted to the outer surface shape of the top of the inner core fixing screw.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] In the above scheme, the sliding of the inner core fixing screw is facilitated by the limit locking assembly, and the sliding resistance of the inner core fixing screw is reduced. In this state, the inner core fixing screw is in the most stable state, and different distances can be selected according to the severity of the fracture end, thereby changing different pressurization effects, greatly improving the holding force of the inner core fixing screw at the fracture end, thereby ensuring that the inner core fixing screw can exert a pressurization effect on the fracture end.

[0019] By setting up the telescopic rod, active rubber plug and baffle, the active rubber plug is stable under normal conditions and can withstand a certain pressure, thereby ensuring that the active rubber plug can limit the position when the telescopic rod shakes slightly. When fixing the fracture ends, the distance needs to be continuously lowered to generate a pressurization effect.

[0020] By providing a U-shaped clamping plate, a buffer arc pad, an elastic sheet and a weakened portion, the inner core fixing screw will no longer slide upward after being clamped at this point, which is the shortest distance between the outer screw sleeve and the inner core fixing screw, thereby effectively adjusting the distance. While being convenient, it can also minimize damage to the patient, thereby improving the practicability and convenience of the device.

[0021] By setting up a telescopic rod and an arc-shaped sleeve, when the arc-shaped sleeve contacts the four sides of the top of the inner core fixing screw, the four sides of the top of the inner core fixing screw will be clamped in the inner cavity of the arc-shaped sleeve. The upper and lower curved ends of the arc-shaped sleeve can effectively prevent the inner core fixing screw from encountering major obstacles when sliding up and down, thereby reducing the additional damage of the inner core fixing screw to the patient's fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the sleeve-combined tension-pressure internal fixation screw;

[0024] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of a sleeve-assembled tension-pressure internal fixation screw;

[0025] Figure 3 for Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0026] Figure 4 for Figure 2 A schematic diagram of the partially enlarged structure at B in the middle;

[0027] Figure 5 It is a schematic diagram of the three-dimensional enlarged structure of the arc sleeve plate, the limiting part 1 and the limiting part 2;

[0028] Figure 6 It is a three-dimensional enlarged structural diagram of the correction block, the adapter block and the U-shaped limit block;

[0029] Figure 7 It is a three-dimensional enlarged structural diagram of the U-shaped clamping plate, the protection plate and the buffer arc pad;

[0030] Figure 8 for Figure 7 A schematic diagram of the partially enlarged structure at C in the middle;

[0031] Fig. 9 for Figure 8 The schematic diagram of the local enlarged structure at D in the middle;

[0032] Fig.10 It is a three-dimensional enlarged structural schematic diagram of a U-shaped clamping plate, an elastic sheet and a weakened portion;

[0033] Fig.11 It is a three-dimensional enlarged structural diagram of the inner core fixing screw and the telescopic rod.

[0034] Reference numerals:

[0035] 1. Outer screw sleeve; 2. Inner core fixing screw; 201. U-shaped clamping plate; 202. Protection plate; 203. Buffer arc pad; 204. Elastic sheet; 205. Weakened part; 206. Hollow frame; 3. Telescopic rod; 301. Active rubber plug; 302. Baffle; 4. Arc sleeve; 401. Limiting part one; 402. Limiting part two; 403. Correction block; 404. Adapter block; 405. Clamping groove; 406. U-shaped limiting block.

[0036] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0037] The following is a detailed description of a sleeve-combined tension-pressing internal fixing screw provided by the present invention in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0038] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0039] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0040] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0041] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0042] like Figures 1 to 11As shown, an embodiment of the present invention provides a sleeve-combined tension-pressurized internal fixing screw, comprising an outer screw sleeve 1, the inner cavity of the outer screw sleeve 1 is slidably connected with an inner core fixing screw 2, the middle part of the top end of the inner core fixing screw 2 is fixedly connected with a telescopic rod 3, and the middle part of the inner cavity of the outer screw sleeve 1 is fixedly connected with an arc-shaped sleeve plate 4; a limit locking component, the limit locking component is used to shorten the distance between the outer screw sleeve 1 and the two ends of the fracture, and the limit locking component is connected to the outer screw sleeve 1. In the present invention, the overall material of the outer screw sleeve 1 is titanium alloy, and its interior is hollow. The top diameter of the outer screw sleeve 1 is larger than the middle diameter, and the top is provided with a circular array of notches that can be easily twisted. The inner core fixing screw 2 The nail 2 is cylindrical as a whole, with a flat end that penetrates into the outer screw sleeve 1 and a pointed end that is exposed to the outside. The pointed end is convenient for piercing the patient's fracture area. The outer surface of the inner core fixing screw 2 is slidably connected to the inner cavity of the outer screw sleeve 1. The diameter of the inner core fixing screw 2 is slightly smaller than the inner ring diameter of the outer screw sleeve 1, and a slot is provided in the middle of the top of the inner core fixing screw 2. The diameter of the telescopic rod 3 is matched with the diameter of the slot at the top of the inner core fixing screw 2. The telescopic rod 3 is a prior art, which is divided into an outer sleeve and an inner core tube. The outer sleeve is clamped at the top position of the outer screw sleeve 1, and the inner core tube is connected to the inner core fixing screw 2 for lifting and lowering movements. The bottom end of the telescopic rod 3 is fixed in the slot at the top of the inner core fixing screw 2.

[0043] Among them, during use, the top of the large diameter of the outer screw sleeve 1 is first pressed against one end of the fracture area. The notch on the large diameter can increase the friction with the fracture area, thereby enhancing the holding force on the bone. In the initial state, the tip of the inner core fixing screw 2 extends out of most of the bottom end of the outer screw sleeve 1, leaving a small part of the top of the inner core fixing screw 2 in the inner cavity of the outer screw sleeve 1, so that it is convenient to directly press against the corresponding position of the fracture area at the beginning of work to improve accuracy, and then start to gradually approach the bones of the broken ends of the fracture area, and the way of approaching is mainly relying on the sliding of the inner core fixing screw 2 in the inner cavity of the outer screw sleeve 1. The clamping is completed, and the telescopic rod 3 is fixed in the slot at the top of the inner core fixing screw 2, which can further ensure that the sliding trajectory of the inner core fixing screw 2 in the inner cavity of the outer screw sleeve 1 is in the vertical direction to avoid deviation. In the sliding process, the arc sleeve 4 will pass through. When the arc sleeve 4 contacts the four sides of the top of the inner core fixing screw 2, the four sides of the top of the inner core fixing screw 2 will be clamped in the inner cavity of the arc sleeve 4. The upper and lower curved ends of the arc sleeve 4 can well prevent the inner core fixing screw 2 from encountering major obstacles during the up and down sliding, thereby reducing the additional damage of the inner core fixing screw 2 to the patient's fracture.

[0044] like Figure 3As shown, the inner surface of the telescopic rod 3 near the top of the outer screw sleeve 1 is fixedly connected with an active rubber plug 301, and the middle of the bottom end of the active rubber plug 301 is fixedly connected with a baffle 302. The active rubber plug 301 is made of rubber material and has grooves distributed in a vertical array at the end. The outer surface of the active rubber plug 301 slides in the inner cavity of the outer screw sleeve 1. A notch is provided in the middle of the active rubber plug 301, and the diameter of the notch is matched with the diameter of the telescopic rod 3. The baffle 302 is made of a hard material, and the middle part of the baffle 302 is fixed at the middle position of the telescopic rod 3 near the bottom end of the active rubber plug 301, and moves with the movement of the upper part of the telescopic rod 3.

[0045] In the present invention, if the outer surface of the active rubber plug 301 does not have a groove, it will be difficult for the active rubber plug 301 to slide in the inner cavity of the outer screw sleeve 1, which is similar to blocking the needle of a syringe and then pulling the push rod of the inner cavity of the syringe backward. By providing the groove, the sealing between the active rubber plug 301 and the outer screw sleeve 1 can be weakened, thereby improving the sliding effect of the active rubber plug 301. Since the titanium alloy material itself has good magnetic compliance, but is relatively easy to fatigue and break, if the patient is a growing teenager or needs to be removed after recovery, we often pull it out. The top position of the telescopic rod 3 is moved and then pulled outward. During the pulling process, the telescopic rod 3 will be gradually pulled out, and the blocking piece 302 is fixed on the surface of the telescopic rod 3. The fixed blocking piece 302 will move synchronously with the pulling of the telescopic rod 3, and will rest against the bottom of the active rubber plug 301 when it moves to the active rubber plug 301. The active rubber plug 301 is stable under normal conditions and can withstand a certain pressure, thereby ensuring that the active rubber plug 301 can limit the position when the telescopic rod 3 is slightly shaken. When fixing the fracture end, it is necessary to continuously reduce the distance to generate a pressurization effect.

[0046] like Figures 4 to 6As shown, the limit lock includes a limit portion 1 401 provided at the upper curved end of the arc sleeve 4, a limit portion 2 402 is provided at the lower curved end of the arc sleeve 4, a correction block 403 is fixedly connected to the inner cavity of the outer screw sleeve 1 near the end of the arc sleeve 4, an adapter block 404 is fixedly connected to the inner cavity of the outer screw sleeve 1 near the correction block 403, a clamping groove 405 is provided at the upper curved end of the adapter block 404, a U-shaped limit block 406 is fixedly connected to the inner cavity of the outer screw sleeve 1 near the adapter block 404, the limit portion 1 401 and the limit portion 2 402 are respectively provided in the inner cavity of the arc sleeve 4, and are laterally symmetrically distributed, the arc sleeve 4 is made of plastic as a whole, and the interior is hollow, the arc sleeve 4 is distributed on the inner cavity of the outer screw sleeve 1 according to the size of the inner diameter of the outer screw sleeve 1, and since the material of the inner core fixing screw 2 is titanium alloy, it is not It is very heavy, so the two ends of the arc sleeve 4 are cut open, so that the arc sleeve 4 is not a connected whole, the plane end of the correction block 403 is fixed in the inner cavity of the outer screw sleeve 1 and close to the end of the arc sleeve 4, and the arc end of the correction block 403 is open, and a transverse groove is provided in the middle of the arc end, the plane end of the adapter block 404 is fixed in the inner cavity of the outer screw sleeve 1, and is located at the lower end of the correction block 403, and the arc end is open. In order to enhance the clamping and locking effect of the inner core fixing screw 2, a clamping groove 405 is provided on the inner wall of the upper arc surface of the adapter block 404, and the opening length of the clamping groove 405 is half of the overall clamping groove 405, and the plane end of the U-shaped limit block 406 is fixed at the lower end of the adapter block 404 in the inner cavity of the outer screw sleeve 1, and the U-shaped limit block 406 is U-shaped, and the end away from the inner wall of the outer screw sleeve 1 is a bent end.

[0047] In the above-mentioned present invention, each component is made of plastic material, and a number of components are distributed in a vertical array with the same number. When in use, the distance between the outer screw sleeve 1 and the inner core fixing screw 2 is continuously shortened. Under the action of the thrust, the inner core fixing screw 2 begins to slide in the inner cavity of the outer screw sleeve 1, and the flat end of the inner core fixing screw 2 begins to contact the U-shaped limit block 406 first. When the curved end of the U-shaped limit block 406 contacts the flat end of the inner core fixing screw 2, the applied thrust will cause the lower curved end of the U-shaped limit block 406 to deform first. If the supporting capacity of the deformation is less than the thrust, the inner core fixing screw 2 will be deformed. The fixing screw 2 continues to slide. At this time, when the bottom of the flat end of the inner core fixing screw 2 is completely stuck in the lower curved end of the U-shaped limit block 406, the inner core fixing screw 2 is in a preliminary clamping and fixing state. Since the inner core fixing screw 2 is only clamped and fixed by the U-shaped limit block 406 at this time, it has a certain instability. If it continues to be pushed upward, the thrust will be greater than the supporting capacity of the upper curved end of the U-shaped limit block 406, which will cause the flat end of the inner core fixing screw 2 to break away from the clamping area of ​​the U-shaped limit block 406, so that the flat end of the inner core fixing screw 2 comes to the adapter block 404, and the adapter block 404 is in the middle of the arc sleeve plate 4. The same level, that is, when the inner core fixing screw 2 is clamped in the adapter block 404, it is most stable. At this time, the clamping groove 405 will clamp the moving inner core fixing screw 2. At the same time as the clamping groove 405 is clamped, other positions of the plane end of the inner core fixing screw 2 are also in contact with the arc sleeve 4, and the limiting part 402 will preferentially resist the plane end of the inner core fixing screw 2 and concave toward the hollow position of the arc sleeve 4 during deformation, which facilitates the sliding of the inner core fixing screw 2 and reduces the sliding resistance of the inner core fixing screw 2. When the plane end of the inner core fixing screw 2 is completely in the middle position of the arc sleeve 4, the limiting part 402 It will abut against the bottom of the flat end of the inner core fixing screw 2, the limiting portion 401 will abut against the top of the flat end of the inner core fixing screw 2, and the clamping groove 405 will clamp against the top of the flat end of the inner core fixing screw 2. In this state, the inner core fixing screw 2 is in the most stable state. In the case of non-violent exercise, the relative position of the fracture ends can be well maintained, and different distances can be selected according to the severity of the fracture ends, thereby changing different pressurization effects, which greatly improves the holding force of the inner core fixing screw 2 at the fracture ends, thereby ensuring that the inner core fixing screw 2 can exert a pressurizing effect on the fracture ends.

[0048] like Figures 7 to 11As shown, the outer surface of the top of the inner core fixing screw 2 is clamped with a U-shaped clamping plate 201, the side of the upper curved end of the U-shaped clamping plate 201 is fixedly connected with a protective plate 202, the bottom of the protective plate 202 is fixedly connected with a buffer arc pad 203, the inner cavity of the lower curved end of the U-shaped clamping plate 201 is fixedly connected with an elastic sheet 204, and the lower curved end of the U-shaped clamping plate 201 near the elastic sheet 204 is provided with a weakened portion 205, and the top of the inner core fixing screw 2 is fixedly connected with a hollow frame 206, the U-shaped clamping plate 201 is made of plastic, and the flat end of the U-shaped clamping plate 201 is fixed to the middle of the inner cavity of the inner core fixing screw 2, located at the upper part of the topmost arc-shaped sleeve plate 4 of the vertical array, and the open end of the U-shaped clamping plate 201 is divided into an upper end and a lower end, the lower end is provided with a hollow, and the lower end has an extended part, and the protective plate 202 is a solid disk with a diameter edge fixed The inner wall fixed on the upper end of the U-shaped clamping plate 201, the buffer arc pad 203 is flat on the top and convex on the bottom, with a hollow interior. The flat end is fixed on the bottom of the protective plate 202, and the protruding end is directed downward, which is convenient for direct contact with the top of the inner core fixing screw 2, which can play a certain buffering effect. At the same time, it can also prevent the rebound impact force of the inner core fixing screw 2 from causing secondary damage to the fracture after being blocked. The elastic sheet 204 is made of wavy plastic material and is fixed in the hollow middle part of the lower end of the U-shaped clamping plate 201. The weakened part 205 is opened in the extended part of the lower end of the U-shaped clamping plate 201, and is concentrated at the intersection of the U-shaped clamping plate 201 and the extended part. The hollow frame 206 is a hollow frame, and its shape is adapted to the edge shape of the flat end of the inner core fixing screw 2, and the side of the hollow frame 206 is fixed to the edge of the flat end of the inner core fixing screw 2.

[0049] In the present invention, the U-shaped clamping plate 201 is fixed in the inner cavity of the outer screw sleeve 1. In the initial state, the overall length of the inner core fixing screw 2 is smaller than the length of the outer screw sleeve 1. When the inner core fixing screw 2 is fully inserted into the outer screw sleeve 1, there is still a part of hollow space at the top of the outer screw sleeve 1. In order to prevent the tip of the inner core fixing screw 2 from contacting the fracture end, the distance between the U-shaped clamping plate 201 and the bottom end of the outer screw sleeve 1 is smaller than the length of the inner core fixing screw 2. When the inner core fixing screw 2 is inside the clamping plate 201, the tip portion is still exposed. Similarly, the inner core fixing screw 2 will slide in the inner cavity of the outer screw sleeve 1 and gradually approach the position of the U-shaped clamping plate 201, and will preferentially contact the extended portion of the U-shaped clamping plate 201. Under the action of the thrust, the extended portion will cooperate with the weakened portion 205 to flip upward. When the extended portion flips, it will also be squeezed on the hollow frame 206. The interior of the hollow frame 206 is hollow, so it will also be squeezed towards the edge of the flat end of the inner core fixing screw 2. When the extended portion gradually flips to When the screw 206 is vertical, the hollow frame 206 will slide into the U-shaped clamping plate 201. At this time, the hollow frame 206 is no longer squeezed and returns to its original state. The inner core fixing screw 2 continues to slide. When the top of the inner core fixing screw 2 contacts the raised end of the buffer arc pad 203, the raised end will be squeezed upward under the action of reasoning. During the squeezing process, the bottom of the plane end of the inner core fixing screw 2 will abut against the extended part of the U-shaped clamping plate 201 that has returned to its original state. The extended part will support a part of the bottom of the plane end of the inner core fixing screw 2, and the bottom of the plane end of the inner core fixing screw 2 Most of it will be supported by the lower end of the U-shaped clamping plate 201, and the key position is just above the elastic sheet 204. The deformation of the elastic sheet 204 can ensure that the thrust of the inner core fixing screw 2 is weakened during the clamping, thereby reducing the damage to the patient's fracture end caused by the counter-impact force. In this way, the inner core fixing screw 2 will no longer slide upward, which is the shortest distance between the outer screw sleeve 1 and the inner core fixing screw 2, thereby effectively adjusting the distance. It is convenient and can also minimize the damage to the patient, thereby improving the practicability and convenience of the device.

[0050] The workflow of the technical solution of the present invention is as follows:

[0051] In the initial state, the positions of the outer screw sleeve 1 and the inner core fixing screw 2 are the shortest, that is, only a part of the tip of the inner core fixing screw 2 is exposed to the outside (such as Fig.11 ), by pushing the top of the telescopic rod 3 so that the inner core fixing screw 2 gradually slides out (such as Figure 2 ).

[0052] During use, first place the top of the large diameter of the outer screw sleeve 1 against one end of the fracture area. The notch on the large diameter can increase the friction with the fracture area, thereby enhancing the holding force on the bone. In the initial state, the tip of the inner core fixing screw 2 extends out of most of the bottom end of the outer screw sleeve 1, leaving a small part of the top of the inner core fixing screw 2 in the inner cavity of the outer screw sleeve 1, so that it can directly press against the corresponding position of the fracture area at the beginning of work to improve accuracy. Then, the bones of the broken ends of the fracture area are gradually brought closer, and the way of approaching is mainly to rely on the sliding card of the inner core fixing screw 2 in the inner cavity of the outer screw sleeve 1. The connection is completed, and the telescopic rod 3 is fixed in the slot at the top of the inner core fixing screw 2, which can ensure that the sliding trajectory of the inner core fixing screw 2 in the inner cavity of the outer screw sleeve 1 is in the vertical direction to avoid deviation. In the sliding process, it will pass through the arc sleeve 4. When the arc sleeve 4 contacts the four sides of the top of the inner core fixing screw 2, the four sides of the top of the inner core fixing screw 2 will be just clamped in the inner cavity of the arc sleeve 4. The upper and lower curved ends of the arc sleeve 4 can well prevent the inner core fixing screw 2 from encountering major obstacles during the up and down sliding, thereby reducing the additional damage of the inner core fixing screw 2 to the patient's fracture.

[0053] When in use, the distance between the outer screw sleeve 1 and the inner core fixing screw 2 is continuously shortened. Under the action of the thrust, the inner core fixing screw 2 begins to slide in the inner cavity of the outer screw sleeve 1, and the flat end of the inner core fixing screw 2 begins to contact the U-shaped limit block 406 first. When the curved end of the U-shaped limit block 406 hits the flat end of the inner core fixing screw 2, the applied thrust will cause the lower curved end of the U-shaped limit block 406 to deform first. If the supporting capacity of the deformation is less than the thrust, the inner core fixing screw 2 will continue to slide. At this time, when the inner core fixing screw 2 After the bottom of the flat end is completely stuck in the lower curved end of the U-shaped limit block 406, the inner core fixing screw 2 is in a preliminary clamping and fixing state. Since the inner core fixing screw 2 is only clamped and fixed by the U-shaped limit block 406 at this time, it has a certain instability. If it continues to be pushed upward, the thrust will be greater than the supporting capacity of the upper curved end of the U-shaped limit block 406, which will cause the flat end of the inner core fixing screw 2 to break away from the clamping area of ​​the U-shaped limit block 406, so that the flat end of the inner core fixing screw 2 comes to the adapter block 404, and the adapter block 404 is at the same level as the middle part of the arc sleeve plate 4. That is, when the inner core fixing screw 2 is clamped in the adapter block 404, it is most stable. At this time, the clamping groove 405 will clamp the moving inner core fixing screw 2. At the same time as the clamping groove 405 is clamped, other positions of the plane end of the inner core fixing screw 2 are also in contact with the arc sleeve 4. The limiting part 402 will preferentially resist the plane end of the inner core fixing screw 2 and concave toward the hollow position of the arc sleeve 4 during deformation. This effect facilitates the sliding of the inner core fixing screw 2 and reduces the sliding resistance of the inner core fixing screw 2. When the plane end of the inner core fixing screw 2 is completely in the middle position of the arc sleeve 4 When in the position, the limiting part 402 will abut against the bottom of the plane end of the inner core fixing screw 2, the limiting part 401 will abut against the top of the plane end of the inner core fixing screw 2, and the clamping groove 405 will clamp on the top of the plane end of the inner core fixing screw 2. In this state, the inner core fixing screw 2 is in the most stable state, which is the purpose of locking the inner core fixing screw 2. In the case of non-violent exercise, the relative position of the fracture ends can be well maintained, ensuring the holding force of the inner core fixing screw 2 at the fracture ends, thereby improving the pressurization effect of the inner core fixing screw 2 on the fracture ends.

[0054] The U-shaped clamping plate 201 is fixed in the inner cavity of the outer screw sleeve 1. In the initial state, the overall length of the inner core fixing screw 2 is smaller than the length of the outer screw sleeve 1. When the inner core fixing screw 2 is fully inserted into the outer screw sleeve 1, there is still a part of hollow space at the top of the outer screw sleeve 1. In order to prevent the tip of the inner core fixing screw 2 from contacting the fracture end, the distance between the U-shaped clamping plate 201 and the bottom end of the outer screw sleeve 1 is smaller than the length of the inner core fixing screw 2. 1, the tip portion is still exposed to the outside. Similarly, the inner core fixing screw 2 will slide in the inner cavity of the outer screw sleeve 1 and gradually approach the position of the U-shaped clamping plate 201, and will preferentially contact the extended portion of the U-shaped clamping plate 201. Under the action of the thrust, the extended portion will cooperate with the weakened portion 205 to flip upward. When the extended portion flips, it will also be squeezed on the hollow frame 206. The interior of the hollow frame 206 is hollow, so it will also be squeezed towards the edge of the plane end of the inner core fixing screw 2. When the extended portion gradually flips to a vertical position, , the hollow frame 206 will slide into the U-shaped clamping plate 201. At this time, the hollow frame 206 is no longer squeezed and returns to its original state. The inner core fixing screw 2 continues to slide. When the top of the inner core fixing screw 2 contacts the raised end of the buffer arc pad 203, the raised end will be squeezed upward under the action of reasoning. During the squeezing process, the bottom of the plane end of the inner core fixing screw 2 will abut against the extended part of the U-shaped clamping plate 201 that has returned to its original state. The extended part will support a part of the bottom of the plane end of the inner core fixing screw 2, and the bottom of the plane end of the inner core fixing screw 2 Most of it will be supported by the lower end of the U-shaped clamping plate 201, and the key position is just above the elastic sheet 204. The deformation of the elastic sheet 204 can ensure that the thrust of the inner core fixing screw 2 is weakened during clamping, thereby reducing the damage to the patient's fracture end caused by the rebound force. In this way, the inner core fixing screw 2 will no longer slide upward, which is the shortest distance between the outer screw sleeve 1 and the inner core fixing screw 2, thereby effectively adjusting the distance. It is convenient and can also minimize the damage to the patient, thereby improving the practicability and convenience of the device.

[0055] If the patient is a growing teenager or the fracture needs to be removed after recovery, we often pull the top position of the telescopic rod 3 and then pull it outward. During the pulling process, the telescopic rod 3 will gradually be pulled out, and the baffle 302 is fixed on the surface of the telescopic rod 3. The fixed baffle 302 will move synchronously with the pulling of the telescopic rod 3, and will rest against the bottom of the active rubber plug 301 when it moves to the active rubber plug 301. The active rubber plug 301 is stable under normal conditions and can withstand a certain amount of pressure, thereby ensuring that when the telescopic rod 3 shakes slightly, the active rubber plug 301 can be limited. When fixing the fracture end, the distance needs to be continuously reduced to produce a pressurization effect.

[0056] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sleeve-combined tension-pressure internal fixing screw, comprising an outer screw sleeve, characterized in that: The inner cavity of the outer screw sleeve is slidably connected with an inner core fixing screw, the middle part of the top of the inner core fixing screw is fixedly connected with a telescopic rod, and the middle part of the inner cavity of the outer screw sleeve is fixedly connected with an arc sleeve plate; A limit locking assembly is used to shorten the distance between the outer screw sleeve and the two ends of the fracture, and the limit locking assembly is connected to the outer screw sleeve.

2. The sleeve-assembled tension-pressurized internal fixation screw according to claim 1, characterized in that: The limit lock includes a limit portion 1 opened at the curved end of the arc sleeve, a limit portion 2 opened at the lower curved end of the arc sleeve, and a correction block is fixedly connected to the inner cavity of the outer screw sleeve near the end of the arc sleeve.

3. The sleeve-assembled tension-pressurized internal fixation screw according to claim 2, characterized in that: The outer screw sleeve is fixedly connected with an adapter block near the inner cavity of the correction block, the upper curved end of the adapter block is provided with a clamping groove, and the outer screw sleeve is fixedly connected with a U-shaped limit block near the inner cavity of the adapter block.

4. The sleeve-assembled tension-pressurized internal fixation screw according to claim 1, characterized in that: A U-shaped clamping plate is clamped on the outer surface of the top of the inner core fixing screw, a protective plate is fixedly connected to the side of the curved end of the U-shaped clamping plate, and a buffer arc pad is fixedly connected to the bottom of the protective plate.

5. The sleeve-assembled tension-pressurized internal fixing screw according to claim 4, characterized in that: An elastic sheet is fixedly connected to the inner cavity of the lower curved end of the U-shaped clamping plate, a weakened portion is provided at the lower curved end of the U-shaped clamping plate close to the elastic sheet, and a hollow frame is fixedly connected to the top end of the inner core fixing screw.

6. The sleeve-assembled tension-pressurized internal fixation screw according to claim 1, characterized in that: An active rubber plug is fixedly connected to the inner surface of the telescopic rod close to the top end of the outer screw sleeve, and a blocking piece is fixedly connected to the middle part of the bottom end of the active rubber plug.

7. The sleeve-assembled tension-pressurized internal fixation screw according to claim 2, characterized in that: The arc-shaped sleeve is made of plastic and has a hollow inner cavity. The limiting portion 1 and the limiting portion 2 are laterally symmetrically distributed through the middle of the arc-shaped sleeve. The end of the correction block away from the inner wall of the outer screw sleeve is arc-shaped, and a transverse groove is provided in the middle of the arc.

8. The sleeve-assembled tension-pressurized internal fixation screw according to claim 3, characterized in that: The length of the clamping groove is half of the length of the adapter block. The U-shaped limiting block is made of plastic material, and the upper and lower curved ends are provided with hooks.

9. The sleeve-assembled tension-pressurized internal fixation screw according to claim 4, characterized in that: The opposite surface of the U-shaped clamping plate and the inner core fixing screw is fixedly connected to the inner cavity of the outer screw sleeve, the upper and lower curved ends of the U-shaped clamping plate are arranged to be hollow, the contact end of the buffer arc pad and the protection plate is flat, and its opposite surface is an arc convex outward, and the inside is hollow.

10. The sleeve-assembled tension-pressurized internal fixation screw according to claim 5, characterized in that: The elastic sheet is fixedly connected to the inner cavity of the lower curved end of the U-shaped clamping plate, the middle part of the hollow frame is hollow, and the shape of the hollow frame is adapted to the outer surface shape of the top of the inner core fixing screw.

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