An internal fixation system for repairing osteoporotic metaphyseal fractures

Abstract

The utility model provides a kind of for dry apophysis end osteoporosis fracture repair internal fixation system, belong to medical equipment technical field, in prior art, when injecting material into hollow screw, material is easy to leak from screw tail, the utility model includes: locking plate, screw and syringe, multiple The screw is cooperatively arranged on locking plate, the screw is provided with hollow channel, it is characterized in that, the syringe is detachably connected with screw by hollow channel, further include: material flow structure, the material flow structure is arranged on screw and is communicated with central passage, the material flow structure is used to penetrate material in hollow channel. The above-mentioned structure setting can promote the improvement of local bone density and bone quality, start stable fracture end, prevent internal fixation loose, and make medicine not reverse leakage from the gap between needle and hollow channel.

Description

Technical Field

[0001] This utility model belongs to the field of medical equipment technology, specifically relating to an internal fixation system for repairing osteoporotic fractures of the metaphysis. Background Technology

[0002] Osteoporotic fractures of the metaphysis can be internally fixed with plates and screws. However, due to osteoporosis, problems such as shortening and loosening of the internal fixation devices may occur after fixation. Prolonged bed rest will exacerbate osteoporosis, significantly increasing the risk of future fractures. Improving local bone strength can increase the holding force of the internal fixation screws, preventing screw dislodgement and loosening, and reducing the risk of future fractures.

[0003] Currently used screws for internal fixation of fractures in clinical practice only provide internal fixation and cannot improve the bone strength of cancellous bone. To improve the bone strength of cancellous bone, drugs that promote new bone formation can be injected locally. By enhancing local new bone formation, local bone strength can be improved. Alternatively, liquid biological agents can be injected locally to enhance local hardness and ultimately prevent refracture. Injecting the above-mentioned drugs or liquid biological agents after the internal fixation plate has been installed and the fracture has stabilized can reduce repeated damage to the fracture ends and is of great significance in preventing loosening of the internal fixation device.

[0004] Therefore, by installing locking hollow screws on the metaphyseal internal fixation plate and adding side holes to the locking hollow screws, or by adding side holes to the hollow screws for internal fixation that can be used alone, the above-mentioned drugs or liquid biological agents can be injected into the proximal femoral cancellous bone by pressure injection, thereby achieving the ultimate goal of improving the strength of the proximal femoral bone.

[0005] A search revealed a patent with patent number CN105611886A entitled "Hollow Bone Screw". Due to the gap between the material feeding tool (sleeve) and the hollow screw, when the material is injected into the hollow screw using a pressure injection method, the material is prone to leaking from the tail of the screw, preventing it from penetrating into the bone to exert its function.

[0006] Therefore, it is extremely important to design an internal fixation system for the repair of osteoporotic metaphyseal fractures. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an internal fixation system for repairing osteoporotic fractures of the metaphysis, including a screw with a hollow channel. The screw also needs to have a structure that allows materials (such as liquid drugs, PRP, bone cement, or protein glue mixed with cytokines such as BMP) to permeate from the hollow channel into the surrounding cancellous bone. At the same time, when the material is injected into the screw with a syringe, the material must not leak from the tail of the screw.

[0008] Based on the above technical concept, the technical solution adopted by this utility model is as follows:

[0009] An internal fixation system for repairing osteoporotic metaphyseal fractures includes: a locking plate and a plurality of hollow screws fitted on the locking plate, characterized in that the hollow channel of the hollow screw is used in conjunction with a syringe for injecting material into the fracture site, and the syringe is detachably connected to the hollow screw.

[0010] The screw has a material flow structure, which is connected to the hollow channel of the hollow screw. The material flow structure is used to allow material to permeate out of the hollow channel.

[0011] In the above technical solution, preferably, the hollow channel is provided with an internal thread, and the distal end of the syringe is provided with a first external thread that can mate with the internal thread.

[0012] Further defining the above technical solution, the hollow screw includes a screw body, and the hollow channel is arranged along the axial direction of the screw body and penetrates the screw body.

[0013] To further define the above technical solution, the hollow screw also includes an interface, which is located at the tail of the screw body.

[0014] In the above technical solution, it is further specified that the interface is provided with a second external thread and a coupling part, the coupling part being used for detachable connection with the drive device.

[0015] Furthermore, in the above technical solution, the interface is also provided with a tail cap, which is configured to cooperate with the coupling part.

[0016] Furthermore, in the above technical solution, the material flow structure is a side hole, and the nail body is provided with multiple staggered side holes.

[0017] The beneficial effects of this utility model are:

[0018] First, by setting multiple side holes of different heights and orientations on the screw body, all of which are connected to the hollow channel inside the screw body, when the syringe injects drugs or biological agents into the hollow channel, the drugs will penetrate into the cancellous bone around the screw through each side hole, promoting the improvement of local bone density and bone quality, stabilizing the fracture ends, and preventing the internal fixation device from loosening.

[0019] Secondly, by setting an internal thread in the hollow channel and setting an external thread at the front end of the syringe to match the internal thread, when the syringe is used to inject drugs into the hollow channel, the syringe needle will lock with the hollow channel, preventing the drug from leaking back from the gap between the needle and the hollow channel. By setting a tail cap at the screw interface, the tail cap can also seal the interface after the syringe is removed after injection, preventing material leakage. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of Example 1;

[0022] Figure 2 This is a schematic diagram of the screw structure in Example 1;

[0023] Figure 3 This is a cross-sectional view of the screw in Example 1;

[0024] Figure 4 This is a schematic diagram of the syringe structure of Example 1;

[0025] Figure 5 This is a partial cross-sectional view of the connection between the syringe and the hollow channel in Example 1;

[0026] Figure 6 This is a schematic diagram of the tail cap structure in Example 2;

[0027] Figure 7 This is a schematic diagram of the structure at the junction of the tail cap and the coupling part in Embodiment 2;

[0028] Figure 8 This is a schematic diagram of the screw structure in Example 3;

[0029] Among them, 1. hollow screw; 2. screw body; 201. hollow channel; 202. internal thread; 203. side hole; 204. screw head; 3. interface; 301. coupling part; 302. second external thread; 303. tail cap; 304. seam; 4. locking plate; 401. locking hole; 5. syringe; 501. sleeve; 502. piston; 503. push handle; 504. auxiliary handle; 505. injection needle; 506. first external thread. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0031] In the description of this utility model, it should be understood that the terms "length direction," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features limited to "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The following is a reference appendix. Figure 1-8 The complete technical solution and embodiments of this application are described in detail. Example 1

[0034] This embodiment provides an internal fixation system for repairing osteoporotic metaphyseal fractures, such as... Figure 1-5 As shown, it includes: a locking plate 4 and a plurality of hollow screws 1 that are fitted onto the locking plate 4. The hollow screw 1 has a hollow channel 201 that is used in conjunction with a syringe 5 for injecting material into the fracture site. The syringe 5 is detachably connected to the hollow screw 1. The exemplary locking plate 4 has a length of 90-268 mm, a width of 12 mm, and a thickness of 3-3.75 mm. The hollow screw 1 has an outer diameter of 3.5 mm, an inner diameter of 2.5 mm, and a length of 16-40 mm.

[0035] The hollow screw 1 has a material flow structure, which is connected to the central channel 201 of the hollow screw 1. The material flow structure is used to allow material to permeate out of the hollow channel 201.

[0036] The hollow channel 201 has an internal thread 202 at one end near the interface 3, and the syringe 5 has a first external thread 506 at its distal end that can mate with the internal thread 202. The hollow screw 1 includes a screw body 2, and the hollow channel 201 is arranged along the axial direction of the screw body 2 and passes through the screw body 2.

[0037] In this embodiment, the nail body 2 is hollow, that is, the hollow channel 201 is arranged along the axial direction of the nail body 2 and passes through the nail body 2. The hollow channel 201 is preferably cylindrical, that is, the hollow channel 201 has a constant diameter from the head to the tail of the nail body 2. The inner wall of the hollow channel 201 near the tail of the nail body 2 is provided with an internal thread 202.

[0038] In this embodiment, the nail body 2 is set to be fully threaded, and the head of the nail body 2 can be set to a conical shape, which makes it easier to insert.

[0039] The syringe 5 is used to contain and deliver materials, injecting them into the hollow channel 201 by pressurized injection. The syringe 5 includes a sleeve 501 and a piston 502. The exemplary sleeve 501 has a diameter of 10 mm, an inner diameter of 9 mm, and a thickness of 1 mm. A push handle 503 is provided at the end of the piston 502 for pushing the piston 502. The sleeve 501 is fitted onto the outside of the piston 502 and contains materials. The sleeve 501 has a scale to determine the amount of material injected. An auxiliary handle 504 is also provided at the end of the sleeve 501 near the piston 502 to assist in the pushing action and provide support for holding and operating the syringe 5. The handle is designed in an ergonomic shape to provide a comfortable grip and operating experience. The other end of the sleeve 501 is also provided with an injection needle 505. The end of the injection needle 505 is provided with an external thread corresponding to the internal thread 202 of the inner wall of the hollow channel 201. The injection needle 505 and the hollow channel 201 can be locked together to achieve a detachable connection, so that when injecting material, there is no gap between the hollow channel 201 and the syringe 5, and the material will not leak out from the tail of the nail body 2. In the exemplary case, the external thread on the injection needle 505 has a thread depth of 0.7mm and a length of 2mm. The injection needle 505 is 5cm long, has an inner diameter of 1.77mm, and a thickness of 1mm. The material flow structure is a side hole 203. The nail body 2 is provided with multiple staggered side holes 203. In the exemplary case, the outer diameter of the nail body 2 is 3.5mm, the inner diameter is 2.5mm, and the length is 16-40mm. The diameter of the side hole 203 is 1mm.

[0040] The material flow structure is connected to the central channel. When the syringe 5 injects material into the central channel, the material can penetrate into the surrounding bone in a certain area through the material flow structure. The material includes, but is not limited to, PRP, bone cement, or protein glue mixed with cytokines such as BMP. In this embodiment, the material flow structure is a side hole 203. Multiple side holes 203 are provided on the nail body 2, and they are all staggered, preferably at different heights and with different orientations. The side holes 203 are preferably cylindrical, and their axes are perpendicular to the axis of the nail body 2. In this embodiment, the multiple side holes 203 are evenly distributed along the axial direction of the nail body 2, and their axes are all at a 120-degree angle. No side holes 203 are provided within 1 cm of the head and tail of the nail body 2. Of course, the distribution of the side holes 203 is not limited to the above distribution method.

[0041] The hollow screw 1 also includes an interface 3, which is located at the tail of the screw body 2. The interface 3 is provided with a second external thread 302 and a coupling part 301, which is used for detachable connection with the driving device.

[0042] In this embodiment, the locking plate 4 is provided with multiple locking holes 401, and each locking hole 401 is provided with an internal thread 202. The second external thread 302 at the locking pin interface 3 is provided in accordance with the internal thread 202. The hollow screw 1 can be fixed on the locking plate 4 by the cooperation of the second external thread 302 and the internal thread 202.

[0043] In this embodiment, the hollow screw 1 includes a screw body 2 and an interface 3. The interface 3 is provided with a coupling part 301, which is configured to cooperate with a driving device. Here, the driving device refers to a device that can cooperate with the interface 3 to lock the hollow screw 1 and the locking plate 4, such as a screwdriver, preferably a hexagonal Torx screwdriver. The coupling part 301 of the interface 3 is configured with a Torx-shaped groove corresponding to the end of the screwdriver, which can increase the contact area between the screwdriver head and the interface 3, making it less likely to slip out or break. The lead of the Torx screw is larger than that of the Phillips head, so it can be screwed in faster during installation. Moreover, since the Torx screw can transmit a larger torque, it can have a larger preload force and fits more tightly with the screwdriver, making it less likely to slip out during operation. Example 2

[0044] The interface 3 is also provided with a tail cap 303, which is configured to cooperate with the coupling part 301.

[0045] This embodiment is an improvement on embodiment 1. The difference is that a tail cap 303 is provided at the interface 3 of the hollow screw 1. The tail cap 303 can cooperate with the coupling part 301 of the interface 3, preferably with an interference fit. A slit 304 is provided in the middle of the tail cap 303. The tail cap 303 is made of elastic material, preferably rubber.

[0046] After the hollow screw 1 is installed on the steel plate by the drive device, the tail cap 303 can be matched with the coupling part 301 at the interface 3 to close the interface 3. When it is necessary to inject material using the syringe 5, since the tail cap 303 is made of elastic material, the needle of the syringe 5 can pass through the slit 304 in the middle of the tail cap 303. The external thread on the needle is matched and locked with the internal thread 202 of the hollow channel 201 to inject material into the hollow channel 201. After the injection is completed, the needle is withdrawn from the slit 304 of the tail cap 303. The tail cap 303 returns to its original shape due to elasticity, so that the tail of the hollow channel 201 is in a closed state and the material inside will not leak from the tail. Example 3

[0047] This embodiment is an improvement upon Embodiment 1. The key difference lies in the absence of a threaded section at the location of the side hole 203 on the screw body 2, and the different shape of the side hole 203. Specifically, the side hole 203 is only present on the unthreaded section. This is because the presence of external threads would prevent material, especially high-density bone material, from flowing smoothly across the surface of the hollow screw 1. Therefore, by avoiding any external threads, the head of the hollow screw 1 can be completely closed, thus achieving a better connection with the bone.

[0048] In this embodiment, the side hole 203 is not cylindrical, but rather a cone-shaped design. The end of the side hole 203 that connects to the hollow channel 201 has a smaller diameter, and the diameter gradually increases outwards.

[0049] Insert a guide pin through the fracture end, and insert the intramedullary nail along the guide pin, so that the intramedullary nail reaches the distal end of the fracture through the fracture end. Finally, fix it with hollow screw 1 at the distal and proximal ends. Match the hexagonal tip of the screwdriver with the hexagonal groove at the interface 3 of the hollow screw 1, rotate the screwdriver so that the external thread of the interface 3 of the hollow screw 1 matches the internal thread 202 of the locking hole 401 of the steel plate, and install the hollow screw 1 into the steel plate. After installation, the tail cap 303 can be installed in the hexagonal groove of the interface 3.

[0050] Taking bone cement injection as an example, first prepare the required bone cement. After opening the bone cement packaging, pour an appropriate amount of bone cement into a clean container. Fully pull out the plunger 502 of syringe 5 to prepare for bone cement injection. Use clean hands or gloves to load the bone cement into syringe 5, ensuring no impurities enter. Push the plunger 502 to push the bone cement to the opening of syringe 5. Check the patient's position and ensure that any local bone infection or other problems have been addressed by the infusion.

[0051] Begin injecting bone cement. Pass the injection needle 505 through the tail cap 303 slot 304 at the interface 3 of the hollow screw 1, ensuring the external thread of the injection needle 505 engages and locks with the internal thread 202 within the hollow channel 201. Then, hold the push handle 503 at the end of the piston 502 and push the piston 502 to inject the bone cement from the cannula into the hollow channel 201. The bone cement permeates into the bone surrounding the screw 2 through the head of the screw body 2 and multiple side holes 203. During injection, ensure a smooth flow without leakage or blockage. After injection, remove the injection needle 505 from the internal thread 202 of the hollow channel 201, pull out the syringe 5, and close the tail cap 303 again. If necessary, gently shake the bone to help the bone cement fully fill the gaps and crevices, allowing the bone cement to dry completely, and ensure the patient recovers in a clean and safe environment.

[0052] It should be understood that the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. An internal fixation system for repairing osteoporotic metaphyseal fractures, comprising: a locking plate (4) and a plurality of hollow screws (1) fitted onto the locking plate (4), characterized in that, The hollow channel (201) of the hollow screw (1) is used in conjunction with a syringe (5) for injecting material into the fracture site, and the syringe (5) is detachably connected to the hollow screw (1). The hollow screw (1) has a material flow structure, which is connected to the hollow channel (201) of the hollow screw (1). The material flow structure is used to allow the material in the hollow channel (201) to permeate out.

2. The internal fixation system for repairing osteoporotic metaphyseal fractures according to claim 1, characterized in that, The hollow channel (201) is provided with an internal thread (202), and the distal end of the syringe (5) is provided with a first external thread (506) that can cooperate with the internal thread (202).

3. The internal fixation system for repairing osteoporotic metaphyseal fractures according to claim 1, characterized in that, The hollow screw (1) includes a screw body (2), and the hollow channel (201) is arranged along the axial direction of the screw body (2) and penetrates the screw body (2).

4. The internal fixation system for repairing osteoporotic metaphyseal fractures according to claim 3, characterized in that, The hollow screw (1) also includes an interface (3), which is located at the tail of the screw body (2).

5. An internal fixation system for repairing osteoporotic metaphyseal fractures according to claim 4, characterized in that, The interface (3) is provided with a second external thread (302) and a coupling part (301), the coupling part (301) being used for detachable connection with the drive device.

6. An internal fixation system for repairing osteoporotic metaphyseal fractures according to claim 5, characterized in that, The interface (3) is also provided with a tail cap (303), which is configured to cooperate with the coupling part (301).

7. An internal fixation system for repairing osteoporotic metaphyseal fractures according to claim 3, characterized in that, The material flow structure is a side hole (203), and the nail body (2) is provided with multiple staggered side holes (203).

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