Hollow screw for fixing medicine-injectable optical positioning device

Abstract

The utility model discloses a hollow screw for fixing a medicine-injectable optical positioning device, which relates to the technical field of medical instruments, and adopts the technical scheme that the hollow screw comprises a first screw and a second screw, one end of the second screw is provided with a cutting edge head, the other end of the second screw is provided with a second inner hexagonal cavity, a screw plug is arranged in the second inner hexagonal cavity, and the first screw and the second screw are integrally formed. A plug cavity is formed in the side, away from the head of the cutting edge, of the second inner hexagonal cavity, a third thread is arranged outside the second screw, an inner thread is arranged inside the second screw, and the inner thread is matched with the second thread of the first screw. According to the hollow screw, the first screw and the second screw are matched, so that the pressure of the broken bone position can be adjusted, better fixation is facilitated, meanwhile, the third threads with different diameters are arranged on the second screw, the problem of thread slipping in the fixing process can be prevented, and the stability of the hollow screw can be better improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, it relates to a hollow screw for fixing an injectable optical positioning device. Background Technology

[0002] A fracture is a complete or partial break in the continuity of bone structure. It is more common in children and the elderly, but also occurs in young and middle-aged people. Patients usually have a fracture in one location, but a few have multiple fractures. Surgical treatment is a relatively effective treatment option.

[0003] With the continuous emergence of new surgical theories, people have realized that the degree of damage to the soft tissues surrounding the fracture and ensuring good blood supply to the bone tissue are equally important. In orthopedic surgery, cannulated screws are a commonly used internal fixation device that plays a significant role in the treatment of fractures. They are mainly used for the fixation and stabilization of fractures and can achieve good fixation results through surgery. They are usually made of titanium alloys, which have high strength and good biocompatibility and are suitable for various fracture internal fixation surgeries.

[0004] Although cannulated screws are widely used in orthopedic surgery, traditional designs have some limitations. For example, traditional integrated screws cannot adjust the fixation pressure at the fracture site, and screw loosening can still occur after fracture surgery, as can the development of bone cysts. In such cases, readjustment of the cannulated screw is necessary, which can easily cause secondary damage to the fracture site and is not conducive to the patient's bone healing and recovery.

[0005] Therefore, the present invention aims to provide a hollow screw for fixing an injectable optical positioning device to solve the above-mentioned problems. Utility Model Content

[0006] The purpose of this invention is to provide a hollow screw for fixing an injectable optical positioning device. This invention uses a first screw and a second screw to adjust the pressure at the fracture site, which helps to fix the bone better. At the same time, the second screw is provided with a third thread of different diameters, which can prevent the problem of stripping during the fixation process and improve the stability of the hollow screw.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a hollow screw for fixing an injectable optical positioning device, comprising a first screw, wherein the two ends of the first screw are respectively provided with a first thread and a second thread, and the end of the first screw near the second thread is provided with a first internal hexagonal cavity.

[0008] The hollow screw also includes a second screw. One end of the second screw is provided with a cutting edge head, and the other end is provided with a second internal hexagonal cavity. A plug cavity is provided on the side of the second internal hexagonal cavity away from the cutting edge head. A screw plug is provided in the plug cavity. The second screw is provided with a third thread on the outside and an internal thread on the inside. The internal thread matches and connects with the second thread of the first screw.

[0009] By adopting the above technical solution, a first thread and a second thread are respectively provided at both ends of the first screw, which can fix the broken bone of the patient. It also includes a second screw, which is threadedly connected to the first screw. The second screw can rotate and extend relative to the first screw, so as to adjust the pressure at the broken bone position and help to fix it better. At the same time, a third thread is provided on the second screw, which can prevent the problem of stripping of ordinary screws during the fixation process and can better improve the stability of the hollow screw.

[0010] The present invention is further configured such that: the end of the first screw near the first thread has a flat head.

[0011] By adopting the above technical solution, a flat head is provided at the end of the first screw near the first thread, that is, without a tip structure, so that the screw can be completely embedded in the bone, without having a negative impact on the movement of the joint, and at the same time reducing the effect of irritation to the soft tissues around the bone.

[0012] The present invention is further configured such that the first screw is provided with a plurality of drainage holes.

[0013] By adopting the above technical solution, multiple drainage holes are provided on the first screw. During the process of adding the medicine, the medicine can be added through the through hole at the tail of the screw. The medicine can smoothly enter the bone around the drainage hole, ensuring the range of action of the medicine in the bone and the smoothness of the medicine addition.

[0014] The present invention is further configured such that: the plug cavity of the second screw is provided with an annular groove.

[0015] The present invention is further configured such that: the screw plug includes a first cylinder and a second cylinder, the first cylinder and the second cylinder are connected, and the second cylinder matches the plug cavity of the second screw.

[0016] By adopting the above technical solution, a first cylinder and a second cylinder are connected to the screw plug. The second cylinder matches the plug cavity of the second screw, which can ensure that the medicine is accurately applied to the fracture connection position. At the same time, if a bone cyst is present in the later stage, a negative pressure drainage device can be directly connected to drain the accumulated material, avoiding the need to remove the hollow screw again, thereby avoiding secondary damage to the patient.

[0017] The present invention is further configured such that: the second cylinder is provided with an annular protrusion, the annular protrusion matching the annular groove in the plug cavity.

[0018] By adopting the above technical solution, annular protrusions are provided on the two cylinders. The annular protrusions match the annular grooves in the plug cavity, which can better ensure the connection stability between the screw plug and the hollow screw.

[0019] In summary, this utility model has the following beneficial effects:

[0020] 1. This utility model includes a first screw with a first thread and a second thread at both ends, which can fix the broken bone of the patient. It also includes a second screw, which is threaded to the first screw. The second screw can rotate and extend relative to the first screw, so as to adjust the pressure at the broken bone position and help fix it better. At the same time, the second screw is provided with a third thread, which can prevent the problem of stripping of ordinary screws during fixation and can better improve the stability of the hollow screw.

[0021] 2. The present invention has a flat head at the end of the first screw near the first thread, that is, without a tip structure, so that the screw can be completely embedded in the bone, without having a negative impact on the movement of the joint, and at the same time reducing the effect of irritation to the soft tissues around the bone.

[0022] 3. This utility model has multiple drainage holes on the first screw. During the process of adding medicine, the medicine can be added through the through hole at the tail of the screw. The medicine can smoothly enter the bone around the bone along the drainage holes, ensuring the range of action of the medicine in the bone and the smoothness of the medicine addition.

[0023] 4. The screw plug is provided with a first cylinder and a second cylinder connected together. The second cylinder matches the plug cavity of the second screw, which can ensure that the medicine is accurately applied to the position of the fracture connection. At the same time, if bone cysts are present later, a negative pressure drainage device can be directly connected to drain the accumulated material, avoiding the need to remove the hollow screw again, thereby avoiding secondary damage to the patient and accelerating the healing of the fracture site. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the appearance of a hollow screw used for fixing a drug-injectable optical positioning device in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the first screw in an embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the two screws in an embodiment of this utility model;

[0027] Figure 4 This is a front sectional view of a hollow screw used for fixing an injectable optical positioning device in an embodiment of this utility model.

[0028] Figure 5 This is a schematic diagram of the screw plug in an embodiment of this utility model;

[0029] Figure 6 This is a cross-sectional view of the connection position of the first screw and the second screw in an embodiment of this utility model.

[0030] In the diagram: 1. First screw; 2. First thread; 3. Second thread; 4. Drain hole; 5. Flat head; 6. First internal hexagonal cavity; 7. Second screw; 8. Third thread; 9. Internal thread; 10. Cutting edge head; 11. Second internal hexagonal cavity; 12. Plug cavity; 13. Annular groove; 14. Screw plug; 15. First cylinder; 16. Second cylinder; 17. Annular protrusion. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in further detail below.

[0032] Example: A hollow screw for fixing an injectable optical positioning device includes a first screw 1, a first thread 2 on the right outer wall of the first screw 1, a flat head 5 at the right end of the first screw 1, a second thread 3 on the left outer wall of the first screw 1, a first internal hexagonal cavity 6 at the end of the first screw 1 near the second thread 3, and a plurality of drainage holes 4 fixedly provided on the first screw 1.

[0033] This embodiment of the hollow screw also includes a second screw 7. The right end of the second screw 7 is provided with a cutting edge head 10, and the other end is provided with a second internal hexagonal cavity 11. A plug cavity 12 is provided on the side of the second internal hexagonal cavity 11 away from the cutting edge head 10. A screw plug 14 is installed in the plug cavity 12. The screw plug 14 includes a first cylinder 15 and a second cylinder 16, which are connected. The second cylinder 16 matches the plug cavity 12 of the second screw 7. The diameter of the second cylinder 16... The diameter of the first cylinder 15 corresponds to the outer diameter of the plug cavity 12. An annular groove 13 is fixedly installed inside the plug cavity 12. At the same time, an annular protrusion 17 is fixedly provided on the second cylinder 16. The annular protrusion 17 matches the annular groove 13 inside the plug cavity 12, which can better increase the stability of the screw plug 14. The second screw 7 is provided with a third thread 8 on the outside and an internal thread 9 is fixedly provided inside the second screw 7. The internal thread 9 matches the second thread 3 of the first screw 1 for threaded connection.

[0034] In this preferred embodiment, the diameter of the third thread 8 on the second screw 7 is larger than the diameter of the first thread 2 on the first screw 1, and the pitch of the third thread 8 on the second screw 7 is smaller than the pitch of the first thread 2 on the first screw 1. That is, the lead of the third thread 8 on the second screw 7 is smaller than the lead of the first thread 2 on the first screw 1. This allows the hollow screw to be screwed in and pressurized evenly from the flat part of the screw to the tail of the screw, making it smoother to use. At the same time, for some patients with low bone density, the different thread diameters can help the hollow screw be more stably fixed at the bone fracture site.

[0035] Working Principle: In use, this invention utilizes a guide pin and drill bit to drill holes at the corresponding positions of the fractured bone. First, the first screw 1 is screwed into the patient's fractured bone, with the first thread 2 and the second thread 3 positioned at opposite ends of the fracture to connect the bones. Next, the second screw 7 is screwed in. The third thread 8 of the second screw 7 has a different diameter than the first thread 2, allowing for better fixation of the fractured bone with the hollow screw. The crack at the fracture site is then observed, and the second screw 7 is slowly rotated until the crack is completely closed, completing the hollow screw fixation. Then, medication is added to the plug cavity 12, which flows through the drainage hole 4 to the fracture site, plugging the screw bone. If a bone cyst develops later, the screw plug 14 can be removed, and an external negative pressure drainage device can be connected. Simultaneously, the drainage hole 4 on the first screw 1 is used to drain the accumulated material, and medication is re-added to aid healing. This avoids the need to remove the hollow screw again, preventing secondary injury to the patient and accelerating bone healing and recovery.

[0036] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A cannulated screw for use in fixing an optical positioning device, characterized in that: Includes a first screw (1), the two ends of the first screw (1) are respectively provided with a first thread (2) and a second thread (3), and the end of the first screw (1) near the second thread (3) is provided with a first internal hexagonal cavity (6); ​ The hollow screw also includes a second screw (7), one end of which is provided with a cutting head (10) and the other end is provided with a second internal hexagonal cavity (11). A plug cavity (12) is provided on the side of the second internal hexagonal cavity (11) away from the cutting head (10). A screw plug (14) is provided in the plug cavity (12). A third thread (8) is provided on the outside of the second screw (7). An internal thread (9) is provided on the inside of the second screw (7). The internal thread (9) is matched and connected with the second thread (3) of the first screw (1).

2. The cannulated screw for use with an injection-molded optical positioning device of claim 1, wherein: the cannulated screw is formed of a material that is biocompatible and has a hardness of at least 50 on the Shore D scale. The first screw (1) has a flat head (5) at the end near the first thread (2).

3. The hollow screw for fixing an injectable optical positioning device according to claim 1, characterized in that: The first screw (1) is provided with multiple drainage holes (4).

4. The cannulated screw for use with an optical positioning device according to claim 1, wherein: the cannulated screw is formed of a material that is capable of being injected into the bone. The plug cavity (12) of the second screw (7) is provided with an annular groove (13).

5. The cannulated screw for use with an injection-molded optical positioning device of claim 4, wherein: the cannulated screw is formed of a material that is biocompatible and has a hardness of at least 50 on the Shore D scale. The screw plug (14) includes a first cylinder (15) and a second cylinder (16), the first cylinder (15) and the second cylinder (16) are connected, and the second cylinder (16) matches the plug cavity (12) of the second screw (7).

6. A hollow screw for fixing an injectable optical positioning device according to claim 5, characterized in that: The second cylinder (16) is provided with an annular protrusion (17), which matches the annular groove (13) in the plug cavity (12).

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