Expansion bone nail

Abstract

The utility model discloses an expansion bone nail, which relates to the field of medical supplies, and comprises a bone nail seat, one end of the bone nail seat is in threaded connection with a bone nail body, the lower end of the bone nail body is in threaded connection with a bone nail head, the upper end of the bone nail head is in sliding connection with an expansion component, and the expansion component is positioned in the bone nail body. The expansion assembly comprises two expansion arc plates arranged at the upper end of the bone nail head, and the expansion arc plates are connected with the upper end of the bone nail head in a sliding mode. By adopting the structure, the expansion block penetrates through the expansion through hole to extend out of the outer side of the bone nail body under the movement of the expansion arc plate, so that the bone nail body is in contact with the inner wall of a bone mounting hole under the action of the expansion block to achieve a fixing effect, the bone nail body is not provided with threads, and the bone nail body is fixed with a bone without the help of the threads; in the implanting process, the bone cannot be cut, and secondary damage can be reduced.

Description

Technical Field

[0001] The utility model belongs to the field of medical supplies, and particularly relates to an expansion bone nail. Background Art

[0002] A fracture refers to a phenomenon in which a bone breaks or breaks due to direct or indirect external force. Depending on whether the fracture site is connected to a wound on the surface of the body, it can be divided into simple fractures or complex fractures. Simple fractures are less likely to be infected because the fracture site is not connected to a wound on the surface of the body. Complex fractures are susceptible to invasion by pathogens because the fracture site is connected to a wound on the surface of the body. Therefore, the fracture site usually needs to be expanded and cleaned, and antibiotics are given to inhibit infection to avoid complications such as poor fracture healing, osteomyelitis, and neurovascular damage.

[0003] According to a Chinese patent with publication number "CN220124789U", an expandable spinal screw with a trabecular structure is disclosed, comprising a screw body and an expandable internal plug, wherein the screw body comprises a nail head, an external thread section and an expansion section arranged in sequence, wherein the interior of the screw body has a guide channel, and the expandable internal plug moves along the guide channel; the screw expansion section is a trabecular structure and has no threads on the outside of the expansion section, and the expansion section is a tapered structure that gradually narrows toward the free end; the expandable spinal screw with a trabecular structure provided by the utility model solves the problem that the fusion performance of the existing expandable spinal screws needs to be improved;

[0004] It can be seen from the above structure that the above device is threadedly connected to the inside of the bone through the external thread segment, and the installation by means of threads may cause secondary damage to the bone due to the rotational movement of the external thread segment when the bone screw is installed in the bone, thereby reducing the practicality of the device, and when the device is disinfected, the bone screw cannot be disassembled, which may cause the hidden parts inside the bone screw to be unable to be effectively disinfected, thereby causing the hygiene standards to be substandard. Utility Model Content

[0005] In view of the problems mentioned in the background technology, the purpose of the present utility model is to provide an expandable bone screw to solve the above problems.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] An expandable bone screw comprises a bone screw seat, one end of the bone screw seat is threadedly connected to the bone screw body, the lower end of the bone screw body is threadedly connected to the bone screw head, the upper end of the bone screw head is slidably connected to an expansion component, the expansion component is located inside the bone screw body, the expansion component comprises an expansion arc plate arranged on the upper end of the bone screw head, two expansion arc plates are provided, the expansion arc plates and the upper end of the bone screw head are slidably connected to each other, the outer sides of the expansion arc plates are fixedly connected to expansion blocks, and a plurality of expansion blocks are equidistantly arranged, the outer sides of the bone screw body are opened with expansion through holes, and a plurality of expansion through holes are equidistantly arranged, the expansion through holes are consistent with the expansion blocks, the inner sides of the expansion arc plates are plugged with expansion rods, and the expansion rods are fixedly connected to the bone screw seat; the expansion component is provided so that secondary damage to the bone can be effectively avoided during use.

[0008] Furthermore, as a preferred technical solution, the upper end of the bone nail head is slidably connected to the expansion assembly, a slide groove is provided at the upper end of the bone nail head, a slider is fixedly connected to the lower end of the expansion arc plate, the slide groove and the slider are slidably connected to each other, and tension springs are fixedly connected to the opposite sides of the expansion arc plate, and a plurality of tension springs are provided.

[0009] Furthermore, as a preferred technical solution, the lower end of the bone screw seat and the upper end of the bone screw body are threadedly connected to each other, the lower end of the bone screw seat is fixedly connected to a screw seat mounting shell, the interior of the screw seat mounting shell is provided with an internal screw seat thread, the upper end outer side of the bone screw body is provided with an external screw seat thread, the external screw seat thread and the internal screw seat thread are threadedly connected to each other, the upper end of the bone screw seat is provided with a disassembly groove, the outer side of the screw seat mounting shell is provided with a rotation anti-skid groove, a plurality of rotation anti-skid grooves are provided, and the outer sides of the rotation anti-skid grooves are fixedly connected to anti-skid pads.

[0010] Furthermore, as a preferred technical solution, the lower end of the bone nail head is threadedly connected to a rubber seat, the upper end of the rubber seat is fixedly connected to a rubber baffle shell, the rubber baffle shell and the bone nail body are fitly connected, the rubber baffle shell wraps the bone nail head, the outside of the bone nail body is fixedly connected to a protective pad, the corners of the protective pad are fixedly connected to the bone nail body, the lower end of the bone nail head and the rubber seat are threadedly connected to each other, the lower end of the bone nail head is provided with an installation thread groove, the upper end of the rubber seat is fixedly connected to a mounting column, the outer surface of the mounting column is provided with an installation external thread, and the installation external thread and the mounting thread groove are threadedly connected to each other.

[0011] Furthermore, as a preferred technical solution, the upper end of the bone nail head and the lower end of the bone nail body are threadedly connected to each other, a nail head mounting groove is provided at the upper end of the bone nail head, an internal nail head thread is provided inside the nail head mounting groove, the lower end of the bone nail body is fixedly connected to a nail head mounting shell, an external nail head thread is provided on the outer side of the nail head mounting shell, and the internal nail head thread and the external nail head thread are threadedly connected to each other.

[0012] In summary, the utility model mainly has the following beneficial effects:

[0013] First, by providing an expansion assembly, when in use, the bone screw body can be inserted into the mounting hole of the bone, and then after the insertion of the bone screw body, the fixing seat can be threadedly connected to the bone screw body. While the bone screw seat is installed, the expansion rod at the lower end of the fixing seat will be inserted into the inner side of the expansion arc plate, so that when the expansion rod is inserted into the expansion arc plate, the expansion arc plate expands and moves toward one side of the bone screw body, and then under the movement of the expansion arc plate, the expansion block passes through the expansion through hole and extends out of the outside of the bone screw body, so that under the action of the expansion block, it contacts the inner wall of the bone mounting hole to achieve a fixing effect. There is no thread on the bone screw body, and the thread is not used to achieve fixation with the bone. During the implantation process, no cutting effect will be produced on the bone, which helps to reduce secondary injuries.

[0014] Secondly, when the bone screw body is in use and the device needs to be disinfected, the rubber seat can be disassembled under the action of the external thread, and then the fixing seat is rotated to separate the fixing seat from the bone screw body, and finally the bone screw head is rotated to disassemble the bone screw head from the bone screw body. This makes it possible to achieve a better disinfection effect when the bone screw body is disassembled and disinfected, and avoids the situation where the hidden parts inside the bone screw body cannot be effectively disinfected. This makes it more convenient to disinfect the bone screw body, and the disinfection effect is better, thereby further increasing the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the fixing seat of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the bone nail body of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the expansion assembly of the utility model;

[0019] Figure 5 It is a structural schematic diagram of the rubber seat of the utility model.

[0020] Figure numerals: 1. bone nail seat, 2. bone nail body, 3. expansion assembly, 31. expansion arc plate, 32. expansion block, 33. expansion through hole, 34. expansion rod, 4. bone nail head, 5. disassembly and assembly groove, 6. rotation anti-skid groove, 7. nail seat internal thread, 8. nail seat mounting shell, 9. nail seat external thread, 10. nail head mounting shell, 11. nail head external thread, 12. nail head mounting groove, 13. nail head internal thread, 14. slide groove, 15. slider, 16. tension spring, 17. rubber seat, 18. rubber stop shell, 19. mounting column, 20. mounting external thread, 21. protective pad. DETAILED DESCRIPTION

[0021] Example

[0022] refer to Figures 1 to 5 , an expandable bone screw of the present embodiment includes a bone screw seat 1, one end of the bone screw seat 1 is threadedly connected to a bone screw body 2, the lower end of the bone screw body 2 is threadedly connected to a bone screw head 4, the upper end of the bone screw head 4 is slidably connected to an expansion component 3, the expansion component 3 is located inside the bone screw body 2, the expansion component 3 includes an expansion arc plate 31 arranged at the upper end of the bone screw head 4, two expansion arc plates 31 are provided, the expansion arc plates 31 and the upper end of the bone screw head 4 are slidably connected to each other, the outer sides of the expansion arc plates 31 are fixedly connected to expansion blocks 32, and a plurality of expansion blocks 32 are arranged at equal distances, the outer sides of the bone screw body 2 are opened with expansion through holes 33, and a plurality of expansion through holes 33 are arranged at equal distances, and the expansion through holes 33 coincide with the expansion blocks 32, and the inner sides of the expansion arc plates 31 are plugged with expansion rods 34, and the expansion rods 34 and the bone screw seat 1 are fixedly connected to each other.

[0023] refer to Figure 4 The upper end of the bone nail head 4 is slidably connected with the expansion component 3, and a slide groove 14 is provided at the upper end of the bone nail head 4. A slider 15 is fixedly connected to the lower end of the expansion arc plate 31. The slide groove 14 and the slider 15 are slidably connected to each other. The opposite sides of the expansion arc plate 31 are fixedly connected with tension springs 16, and a plurality of tension springs 16 are provided; the provided sliders 15 and slide grooves 14 reduce the friction between the bone nail head 4 and the expansion arc plate 31, thereby avoiding the phenomenon that the expansion arc plate 31 cannot move due to excessive resistance, and under the action of the tension spring 16, when the expansion rod 34 pulls out the expansion arc plate 31, the expansion arc plate 31 can be reset.

[0024] refer to Figure 1-Figure 3The lower end of the bone screw seat 1 is threadedly connected with the upper end of the bone screw body 2, and the lower end of the bone screw seat 1 is fixedly connected with a screw seat mounting shell 8, and a screw seat internal thread 7 is provided inside the screw seat mounting shell 8, and a screw seat external thread 9 is provided on the outer side of the upper end of the bone screw body 2, and the screw seat external thread 9 is threadedly connected with the screw seat internal thread 7. A disassembly groove 5 is provided at the upper end of the bone screw seat 1, and a rotation anti-skid groove 146 is provided on the outer side of the screw seat mounting shell 8. A plurality of rotation anti-skid grooves 146 are provided, and the outer sides of the rotation anti-skid grooves 146 are fixedly connected to anti-skid pads; the set screw seat internal thread 7 and the screw seat external thread 9 can facilitate the disassembly and assembly of the fixing seat and the bone screw body 2, and the disassembly and assembly of the fixing seat can be conveniently performed under the action of the disassembly and assembly groove 5 and the rotation anti-skid groove 146.

[0025] refer to Figure 1 and Figure 5 The lower end of the bone nail head 4 is threadedly connected to a rubber seat 17, and the upper end of the rubber seat 17 is fixedly connected to a rubber stopper shell 18, which is fitted and connected to the bone nail body 2, and the rubber stopper shell 18 wraps the bone nail head 4. The outer side of the bone nail body 2 is fixedly connected with a protective pad 21, and the corners of the protective pad 21 are fixedly connected to the bone nail body 2. The lower end of the bone nail head 4 is threadedly connected to the rubber seat 17, and the lower end of the bone nail head 4 is provided with a mounting thread groove, and the upper end of the rubber seat 17 is fixedly connected to a mounting column 19, and the outer surface of the mounting column 19 is provided with a mounting external thread 20, and the mounting external thread 20 is threadedly connected to the mounting thread groove; the rubber seat 17 is set to avoid the situation where the bone nail body directly contacts the bone and causes discomfort to the patient, and the rubber seat 17 can be easily disassembled under the action of the mounting external thread 20.

[0026] refer to Figure 3 and Figure 4 The upper end of the bone nail head 4 is threadedly connected to the lower end of the bone nail body 2. A nail head mounting groove 12 is provided at the upper end of the bone nail head 4, and a nail head internal thread 13 is provided inside the nail head mounting groove 12. The lower end of the bone nail body 2 is fixedly connected to a nail head mounting shell 10, and a nail head external thread 11 is provided on the outer side of the nail head mounting shell 10. The nail head internal thread 13 and the nail head external thread 11 are threadedly connected to each other; the setting of the nail head internal thread 13 and the nail head external thread 11 can facilitate the disassembly and assembly of the bone nail head 4 and the bone nail body 2.

[0027] Principle and advantages of use: When in use, the device is first disinfected and sterilized, and its rubber seat 17 can be disassembled under the action of the external thread 20, and then the fixing seat is rotated to separate the fixing seat from the bone nail body 2, and finally the bone nail head 4 is rotated to disassemble the bone nail head 4 from the bone nail body 2, so that the disinfection effect is better when the bone nail body is disassembled and disinfected, and the hidden parts inside the bone nail body cannot be effectively disinfected, so that it is more convenient to disinfect and sterilize the bone nail body, and the disinfection and sterilization effect is better. After the disinfection and sterilization is completed, the device can be assembled and the assembly is completed. The commonly used device can be used by inserting the bone screw body into the mounting hole of the bone, and then after the bone screw body 2 is inserted, the fixing seat can be threadedly connected to the bone screw body 2. When the bone screw seat 1 is installed, the expansion rod 34 at the lower end of the fixing seat will be inserted into the inner side of the expansion arc plate 31, so that when the expansion rod 34 is inserted into the expansion arc plate 31, the expansion arc plate 31 expands and moves toward one side of the bone screw body 2, and then under the movement of the expansion arc plate 31, the expansion block 32 passes through the expansion through hole 33 and extends out of the outside of the bone screw body 2, so that under the action of the expansion block 32, it contacts the inner wall of the bone mounting hole to achieve a fixing effect.

Claims

1. An expandable bone screw, characterized in that: It includes a bone screw seat, one end of the bone screw seat is threadedly connected to the bone screw body, the lower end of the bone screw body is threadedly connected to the bone screw head, the upper end of the bone screw head is slidably connected to an expansion component, the expansion component is located inside the bone screw body, the expansion component includes an expansion arc plate arranged on the upper end of the bone screw head, two expansion arc plates are provided, the expansion arc plate and the upper end of the bone screw head are slidably connected to each other, the outer sides of the expansion arc plates are fixedly connected to expansion blocks, and a plurality of expansion blocks are equidistantly arranged, the outer side of the bone screw body is opened with expansion through holes, and a plurality of expansion through holes are equidistantly arranged, the expansion through holes are consistent with the expansion blocks, the inner sides of the expansion arc plates are inserted with expansion rods, and the expansion rods and the bone screw seat are fixedly connected to each other.

2. The expandable bone screw according to claim 1, characterized in that: The upper end of the bone nail head is slidably connected to the expansion component, a slide groove is provided at the upper end of the bone nail head, a slider is fixedly connected to the lower end of the expansion arc plate, the slide groove and the slider are slidably connected to each other, and tension springs are fixedly connected to the opposite sides of the expansion arc plate, and a plurality of tension springs are provided.

3. The expandable bone screw according to claim 1, characterized in that: The lower end of the bone screw seat is threadedly connected to the upper end of the bone screw body, and the lower end of the bone screw seat is fixedly connected to a screw seat mounting shell. The interior of the screw seat mounting shell is provided with an internal screw seat thread, and the outer side of the upper end of the bone screw body is provided with an external screw seat thread. The external screw seat thread and the internal screw seat thread are threadedly connected to each other.

4. The expandable bone screw according to claim 3, characterized in that: The upper end of the bone screw seat is provided with a disassembly and assembly groove, and the outer side of the screw seat installation shell is provided with a rotation anti-skid groove, wherein a plurality of the rotation anti-skid grooves are provided, and the outer sides of the rotation anti-skid grooves are all fixedly connected with anti-skid pads.

5. The expandable bone screw according to claim 1, characterized in that: The lower end of the bone nail head is threadedly connected to a rubber seat, the upper end of the rubber seat is fixedly connected to a rubber stopper shell, the rubber stopper shell and the bone nail body are fitly connected to each other, the rubber stopper shell wraps the bone nail head, the outer side of the bone nail body is fixedly connected to a protective pad, and the corners of the protective pad are fixedly connected to the bone nail body.

6. The expandable bone screw according to claim 5, characterized in that: The lower end of the bone nail head is threadedly connected to the rubber seat, the lower end of the bone nail head is provided with a mounting thread groove, the upper end of the rubber seat is fixedly connected with a mounting column, the outer surface of the mounting column is provided with a mounting external thread, and the mounting external thread is threadedly connected to the mounting thread groove.

7. The expandable bone screw according to claim 1, characterized in that: The upper end of the bone nail head and the lower end of the bone nail body are threadedly connected to each other, the upper end of the bone nail head is provided with a nail head mounting groove, the interior of the nail head mounting groove is provided with a nail head internal thread, the lower end of the bone nail body is fixedly connected with a nail head mounting shell, the outer side of the nail head mounting shell is provided with a nail head external thread, and the nail head internal thread and the nail head external thread are threadedly connected to each other.

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