Minimally invasive sacroiliac screw

Abstract

The utility model provides a minimally invasive sacroiliac screw, and belongs to the technical field of medical instruments. The minimally invasive sacroiliac screw comprises a screw tail and a screw body, the screw tail is arranged at the tail end of the screw body, an injection through hole facilitating bone cement injection is formed in the axis position of the screw tail and the screw body, the injection through hole sequentially penetrates through the screw tail and the screw body and is formed in the length direction of the screw body, an external thread is arranged on the outer side wall of the screw body, and the external thread is connected with the screw body. A dispersion hole is formed in the outer side wall of the nail body and communicates with the injection through hole. The minimally invasive sacroiliac screw has the advantages that after the sacroiliac screw is implanted into the body of a patient, bone cement is injected into the injection through hole, the bone cement is dispersed to the outer side of the screw body through the dispersion hole and is dispersed to the fracture position of the patient, the holding force of the sacroiliac screw is increased, and the fixing stability of the sacroiliac screw is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a minimally invasive sacroiliac screw. Background Technology

[0002] The pelvis, a basin-shaped skeleton connecting the spine and lower limbs, is a complete bony ring formed by the sacrum, coccyx, and the two hip bones. The pelvis not only transfers body weight to the lower limbs and serves as the basis for the free lower limbs' movement, but also supports and protects the abdominal and pelvic organs. With the increasing aging population, low-energy injuries leading to posterior pelvic ring fractures are on the rise, severely impacting the quality of life of the elderly and even endangering their lives. Sacroiliac joint fracture-dislocation is a common posterior pelvic ring injury, commonly repaired and fixed using anterior bone plates, sacral rods, and sacroiliac screws. Traditional lumbar iliac fixation is highly invasive, causing significant damage to the patient and hindering postoperative recovery. Sacroiliac screws can be used for fixation. Due to their good biomechanical properties, sacroiliac screws can be placed minimally invasively with the aid of appropriate surgical equipment. Sacral osteotomy can provide pain relief. Sacroiliac screw fixation combined with sacroiliac osteotomy can meet the patient's need for early ambulation. However, due to osteoporosis, the sacroiliac screws may have poor holding force, making it difficult to achieve a strong fixation. Utility Model Content

[0003] The purpose of this invention is to provide a minimally invasive sacroiliac screw, which aims to solve the problems of poor holding force and unreliable fixation of sacroiliac screws.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a minimally invasive sacroiliac screw is provided, including a screw tail and a screw body. The screw tail is disposed at the tail end of the screw body. An injection through hole is provided at the axis of the screw tail and the screw body to facilitate the injection of bone cement. The injection through hole sequentially penetrates the screw tail and the screw body. The injection through hole is disposed along the length direction of the screw body. An external thread is provided on the outer side wall of the screw body. A diffusion hole is provided on the outer side wall of the screw body, and the diffusion hole communicates with the injection through hole.

[0005] In one possible implementation, the diffusion hole is located in the middle of the nail body.

[0006] In one possible implementation, multiple sets of the diffused holes are distributed along the circumference of the nail body.

[0007] In one possible implementation, a broken connecting tube is provided at the end of the nail tail away from the nail body, and an injection connecting hole communicating with the injection through hole is provided at the axis of the broken connecting tube.

[0008] In one possible implementation, the side wall of the broken connecting tube away from the nail tail is provided with connecting threads.

[0009] In one possible implementation, the front end of the broken connecting tube near the nail tail is provided with a tapered section, the outer diameter of which gradually decreases as it approaches the nail tail.

[0010] In one possible implementation, a limiting part is fitted on the side wall of the broken connecting pipe.

[0011] In one possible implementation, the sidewall of the limiting part is provided with a limiting surface.

[0012] In one possible implementation, the projection of the limiting portion onto the end face of the nail tail is located inside the edge of the nail tail.

[0013] In one possible implementation, the limiting part is disposed in the middle of the broken connecting tube.

[0014] The beneficial effects of the minimally invasive sacroiliac screw provided by this utility model are as follows:

[0015] Compared with existing technologies, this invention includes a screw tail and a screw body. The screw tail is located at the tail end of the screw body. An injection through-hole extends from the tail end of the screw tail to the front end of the screw body, along the length of the screw body. External threads are located on the outer wall of the screw body to facilitate screw implantation into the patient's body. The outer wall of the screw body has a diffusion hole that connects to the injection through-hole. After the sacroiliac screw is implanted into the patient's body, bone cement is injected into the injection through-hole from the screw tail. After the bone cement is injected into the injection through-hole, it diffuses through the diffusion hole to the outer side of the screw body and further diffuses to the patient's fracture site, improving the stability of the fracture fixation, increasing the holding force of the sacroiliac screw, and enhancing the stability of the sacroiliac screw fixation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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.

[0017] Figure 1 A three-dimensional structural diagram of the minimally invasive sacroiliac screw provided for an embodiment of this utility model;

[0018] Figure 2 A frontal view of the minimally invasive sacroiliac screw provided in this embodiment of the utility model;

[0019] Figure 3 A cross-sectional view of the minimally invasive sacroiliac screw provided in this embodiment of the present invention.

[0020] In the diagram: 1. Nail tail; 2. Nail body; 3. External thread; 4. Diffusing hole; 5. Injection through hole; 6. Broken connecting pipe; 7. Connecting thread; 8. Limiting part; 9. Limiting surface; 10. Tapered section; 11. Injection connecting hole. Detailed Implementation

[0021] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] Please refer to Figures 1 to 3 The present invention provides a specific embodiment of a minimally invasive sacroiliac screw, comprising a screw tail 1 and a screw body 2. The screw tail 1 is disposed at the tail end of the screw body 2. An injection through hole 5 is provided at the axis of the screw tail 1 and the screw body 2 to facilitate the injection of bone cement. The injection through hole 5 sequentially penetrates the screw tail 1 and the screw body 2 and is disposed along the length direction of the screw body 2. An external thread 3 is provided on the outer side wall of the screw body 2. A diffusion hole 4 is provided on the outer side wall of the screw body 2, and the diffusion hole 4 communicates with the injection through hole 5.

[0023] This invention provides a minimally invasive sacroiliac screw, which, compared with the prior art, includes a screw tail 1 and a screw body 2. The screw tail 1 is located at the tail end of the screw body 2. An injection through hole 5 extends from the tail end of the screw tail 1 to the front end of the screw body 2, and is set along the length direction of the screw body 2. An external thread 3 is set on the outer side wall of the screw body 2 to facilitate the implantation of the screw body 2 into the patient's body. The outer side wall of the screw body 2 is provided with a diffusion hole 4 that connects to the injection through hole 5. After the sacroiliac screw is implanted into the patient's body, bone cement is injected into the injection through hole 5 from the screw tail 1. After the bone cement is injected into the injection through hole 5, it diffuses to the outer side of the screw body 2 through the diffusion hole 4, and further diffuses to the patient's fracture site, thereby improving the stability of the fracture fixation, increasing the holding force of the sacroiliac screw, and enhancing the stability of the sacroiliac screw fixation.

[0024] For details, please refer to Figures 1 to 3 The device includes a screw tail 1 and a screw body 2. The screw tail 1 is located at the tail end of the screw body 2. An injection through hole 5 is set along the length of the screw body 2, extending from the tail end of the screw tail 1 to the front end of the screw body 2. An external thread 3 is provided on the outer wall of the screw body 2, distributed from the front end of the screw body 2 to the tail end of the screw body 2. A diffusion hole 4 is provided on the outer wall of the screw body 2, which connects to the injection through hole 5. During the implantation process, the screw body 2 is implanted into the patient's sacrum. The bone cement injector injects bone cement from the screw tail 1 into the injection through hole 5. After the bone cement is injected into the injection through hole 5, it diffuses through the diffusion hole 4 to the outer side of the screw body 2, and further diffuses to the patient's fracture site, improving the stability of the fracture fixation, increasing the holding force of the sacroiliac screw, and enhancing the stability of the sacroiliac screw fixation.

[0025] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 The diffusion hole 4 is located in the middle of the nail body 2.

[0026] For details, please refer to Figures 1 to 3 The diffusion holes 4 are located in the middle and front end of the nail body 2. When the nail body 2 is implanted into the patient's sacrum, the middle part of the nail body 2 with the diffusion holes 4 is located on the lateral side of the sacral wing of the sacral foramen of the patient's sacrum. After the bone cement is injected into the injection through hole 5, the bone cement diffuses through the diffusion holes 4 into the sacral wing of the patient's sacrum, thus preventing the bone cement from entering the patient's sacral foramen.

[0027] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 Multiple sets of diffused holes 4 are distributed along the circumference of the nail body 2.

[0028] For details, please refer to Figures 1 to 3 Multiple sets of diffusion holes 4 are provided and distributed along the circumference of the nail body 2, which helps the bone cement to diffuse.

[0029] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 The end of the nail tail 1 away from the nail body 2 is provided with a broken connecting tube 6, and an injection connecting hole 11 connected to the injection through hole 5 is provided at the axis of the broken connecting tube 6.

[0030] For details, please refer to Figures 1 to 3 The broken connecting tube 6 is located at the end of the nail tail 1 away from the nail body 2. An injection connecting hole 11 is provided at the axis of the broken connecting tube 6. The injection connecting hole 11 is set along the length direction of the broken connecting tube 6 and passes through the tail end and the front end of the broken connecting tube 6. The injection connecting hole 11 is connected to the injection through hole 5. The inner diameter of the injection connecting hole 11 and the injection through hole 5 are equal. The tail end of the broken connecting tube 6 is located outside the patient's body. The bone cement injector is located at the tail end of the broken connecting tube 6 to facilitate the injection of bone cement into the nail body 2 and to prevent bone cement leakage at the nail tail 1 during the injection process. After the bone cement injection is completed, the broken connecting tube 6 is broken off for subsequent operations.

[0031] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 The side wall of the broken connecting pipe 6, away from the tail 1, is provided with a connecting thread 7.

[0032] For details, please refer to Figures 1 to 3 The tail end of the connecting tube 6 is provided with a connecting thread 7, which matches the outlet of the bone cement injector to prevent bone cement leakage during the injection process.

[0033] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 The front end of the broken connecting pipe 6 near the nail tail 1 is provided with a tapered section 10, and the outer diameter of the tapered section 10 gradually decreases as it approaches the nail tail 1.

[0034] For details, please refer to Figures 1 to 3 The front end of the broken connecting pipe 6 is provided with a tapered section 10, which is connected to the nail tail 1. As it gets closer to the nail tail 1, the outer diameter of the tapered section 10 gradually decreases, which facilitates the breaking of the broken connecting pipe 6.

[0035] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 A limiting part 8 is fitted on the side wall of the broken connecting pipe 6.

[0036] For details, please refer to Figures 1 to 3 The limiting part 8 is provided on the side wall of the broken connecting tube 6 to match the breaking device. The breaking device is sleeved on the outside of the broken connecting tube 6. The breaking device is operated to break the connecting tube 6. The limiting part 8 matches the breaking device, which facilitates the breaking of the connecting tube 6.

[0037] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 The side wall of the limiting part 8 is provided with a limiting surface 9.

[0038] For details, please refer to Figures 1 to 3 The limiting surface 9 is provided on the side wall of the limiting part 8. There are six sets of limiting surfaces 9. The six sets of limiting surfaces 9 are evenly distributed around the circumference of the limiting part 8, that is, the outer side wall of the limiting part 8 is hexagonal prism.

[0039] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 The projection of the limiting part 8 on the end face of the nail tail 1 is located inside the edge of the nail tail 1.

[0040] For details, please refer to Figures 1 to 3 The nail tail 1 is hexagonal prism-shaped, and the side length of the hexagon formed by the outer edge of the limiting part 8 is smaller than the side length of the hexagon formed by the outer edge of the nail tail 1, which facilitates the use of the breaking instrument.

[0041] As a specific embodiment of the minimally invasive sacroiliac screw provided by this utility model, please refer to Figures 1 to 3 The limiting part 8 is located in the middle of the broken connecting pipe 6.

[0042] For details, please refer to Figures 1 to 3 The limiting part 8 is located in the middle of the broken connecting tube 6, which facilitates the use of the breaking device.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A minimally invasive sacroiliac screw, characterized in that, The device includes a nail tail and a nail body. The nail tail is located at the tail end of the nail body. An injection through hole is provided at the axis of the nail tail and the nail body to facilitate the injection of bone cement. The injection through hole sequentially passes through the nail tail and the nail body. The injection through hole is arranged along the length direction of the nail body. The outer side wall of the nail body is provided with external threads. The outer side wall of the nail body is provided with a diffusion hole, which communicates with the injection through hole.

2. The minimally invasive sacroiliac screw as described in claim 1, characterized in that, The diffuser hole is located in the middle of the nail body.

3. The minimally invasive sacroiliac screw as described in claim 1, characterized in that, Multiple sets of the diffused holes are distributed along the circumference of the nail body.

4. The minimally invasive sacroiliac screw as described in claim 1, characterized in that, A broken connecting tube is provided at the end of the nail tail away from the nail body, and an injection connecting hole is provided at the axis of the broken connecting tube, which is connected to the injection through hole.

5. The minimally invasive sacroiliac screw as described in claim 4, characterized in that, The broken connecting tube has a connecting thread on the side wall of its tail end away from the nail tail.

6. The minimally invasive sacroiliac screw as described in claim 4, characterized in that, The front end of the broken connecting tube near the nail tail is provided with a tapered section, and the outer diameter of the tapered section gradually decreases as it approaches the nail tail.

7. The minimally invasive sacroiliac screw as described in claim 4, characterized in that, A limiting part is fitted on the side wall of the broken connecting pipe.

8. The minimally invasive sacroiliac screw as described in claim 7, characterized in that, The side wall of the limiting part is provided with a limiting surface.

9. A minimally invasive sacroiliac screw as described in claim 7, characterized in that, The projection of the limiting part on the end face of the nail tail is located inside the edge of the nail tail.

10. A minimally invasive sacroiliac screw as described in claim 7, characterized in that, The limiting part is located in the middle of the broken connecting pipe.

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