In-vitro guiding device for sacroiliac screw

Abstract

According to the in-vitro guiding device for the sacroiliac screw, a navigation guide plate manufactured through the 3D printing technology is matched with a guiding assembly, accurate positioning of a kirschner wire is achieved, subsequent guiding and imbedding of the sacroiliac screw are facilitated, and radiation injuries to patients and doctors are reduced. Comprising a guide assembly and a navigation guide plate, the navigation guide plate is obtained by adopting a 3D printer according to collected pelvis CT data, a joint structure for connecting the guide assembly is arranged on the navigation guide plate, the guide assembly comprises a kirschner wire sleeve core, an anti-skid sleeve core and a flaring core, and a guide channel allowing the anti-skid sleeve core to be inserted is formed in the flaring core in a penetrating mode. An anti-skid channel for the kirschner wire sleeve core to be inserted is formed in the anti-skid sleeve core in a penetrating mode, and a channel for the kirschner wire to be inserted is formed in the kirschner wire sleeve core in a penetrating mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices and relates to an external guiding device for sacroiliac screws. Background Art

[0002] The pelvis is composed of the sacrum, ilium, pubis, ischium, etc. Pelvic fractures are complex in anatomy, with many adjacent important tissues and organs, and the fracture types are ever-changing. Sacroiliac screws are well-known to trauma orthopedic surgeons because they have brought a revolutionary leap to the treatment of most unstable posterior pelvic ring injuries, especially the most difficult vertical unstable pelvic fractures. In the minimally invasive field of pelvic fractures, sacroiliac screws are most widely used.

[0003] The treatment of posterior pelvic ring fractures with sacroiliac screws has advantages such as minimal trauma and good biomechanics. However, the anatomical structures around the sacroiliac joint and the sacrum are complex, adjacent to important tissues such as the internal iliac artery and vein, and the lumbosacral trunk, resulting in difficult insertion of sacroiliac joint screws. Channel screws require high fluoroscopy technology. Accurate positioning requires repeated adjustment of the positioning points and directions of Kirschner wires, which is time-consuming and laborious, and increases the radioactive damage to patients and surgeons. When inserting sacroiliac screws under ordinary X-ray fluoroscopy, Kirschner wires need to be implanted first, and the Kirschner wires need to be adjusted to accurately pass through the sacroiliac screw channel and be within the bone mass to avoid the risk of damaging important organs, blood vessels and nerves. External guide plate positioning can solve some clinical problems, reduce the number of intraoperative fluoroscopies, shorten the operation time, and reduce the radiation damage to patients and doctors. Summary of the Utility Model

[0004] The purpose of the utility model is to address the above problems in the existing technology and propose an external guiding device for sacroiliac screws. This guiding device uses 3D printing technology to produce a navigation guide plate that cooperates with the guiding component to achieve accurate positioning, anti-slip insertion of the Kirschner wire, guiding and insertion of the sacroiliac screw, and reduce the radiation damage to patients and doctors.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] An external guiding device for sacroiliac screws includes a guiding component and a navigation guide plate. The navigation guide plate is obtained by a 3D printer according to the collected pelvic CT data. The navigation guide plate is provided with a joint structure for connecting the guiding component. The guiding component includes a Kirschner wire sleeve core, an anti-slip sleeve core, and a flaring core. A guiding channel for inserting the anti-slip sleeve core is penetrated through the flaring core. An anti-slip channel for inserting the Kirschner wire sleeve core is penetrated through the anti-slip sleeve core. A channel for inserting the guiding Kirschner wire is penetrated through the Kirschner wire sleeve core.

[0007] Compared with the existing technology, the utility model has the following advantages:

[0008] The utility model is provided with a guiding component and cooperates with a navigation guide plate obtained by rapid prototyping using 3D printing according to the collected pelvic CT data, which can reduce the number of fluoroscopies, shorten the operation time, and avoid the operation of patients and doctors in an environment with radiation damage. Thus, the Kirschner wire can be quickly and accurately inserted into the ilium. After the Kirschner wire and the anti-slip sleeve core are withdrawn subsequently, the screw can be quickly and accurately inserted into the patient's body through the flaring core, improving the operation effect, simplifying complex operations, and not relying on expensive equipment such as navigation. The dependence on intraoperative fluoroscopy is reduced, the operation difficulty of nail placement is significantly reduced, the operation time, intraoperative fluoroscopy time and frequency are shortened, and the radiation damage to patients is reduced, which has great practicality.

[0009] Further, the joint structure includes a plurality of guiding sleeve cores, and the end of the guiding sleeve core has an opening. One end of the flaring core can be inserted into the guiding sleeve core through the opening and penetrate into the navigation guide plate.

[0010] Further, the navigation guide plate and a plurality of guiding sleeve cores are integrally printed and formed by a 3D printer.

[0011] Further, the lower edge of the anti-slip sleeve core is provided with sawteeth for abutting against the surface of the ilium. The length of the anti-slip sleeve core is greater than the length of the flaring core, and the length of the Kirschner wire sleeve core is greater than the length of the anti-slip sleeve core.

[0012] Further, the outer end of the anti-slip sleeve core has a first annular limiting block, and the inner end face of the first annular limiting block can abut against the outer end face of the flaring core. The outer end face of the Kirschner wire sleeve core has a second annular limiting block, and the inner end face of the second annular limiting block can abut against the outer end face of the first annular limiting block.

[0013] Further, the anti-slip sleeve core and the first annular limiting block are integrated, and the Kirschner wire sleeve core and the second annular limiting block are integrated.

[0014] Further, the navigation guide plate includes a left positioning part and a right positioning part. A connecting block is fixed on one side of the left positioning part, a fixing block is fixed on one side of the right positioning part, and a fixing groove for the end of the connecting block to be clamped is formed in the fixing block.

[0015] Further, a plurality of ventilation holes are formed in the navigation guide plate. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the guiding component of the utility model.

[0017] Figure 2 is a schematic structural diagram of the flaring core of the utility model.

[0018] Figure 3 is a schematic structural diagram of the anti-slip sleeve core of the utility model.

[0019] Figure 4 It is a schematic structural view of the Kirschner wire sleeve core of the present utility model.

[0020] Figure 5 It is a front view of the navigation guide plate of the present utility model.

[0021] Figure 6 It is a top view cross-sectional view of the navigation guide plate of the present utility model.

[0022] Figure 7 It is a rear view of the navigation guide plate of the present utility model.

[0023] Figure 8 It is a cross-sectional view of the connecting block and the fixing block of the present utility model.

[0024] In the figure, 1. Navigation guide plate; 2. Kirschner wire sleeve core; 3. Anti-slip sleeve core; 4. Flaring core; 5. Guide sleeve core; 6. Saw teeth; 7. First annular limiting block; 8. Second annular limiting block; 9. Left positioning part; 10. Right positioning part; 11. Connecting block; 12. Fixing block; 13. Ventilation hole. Specific embodiments

[0025] The following are specific embodiments of the present utility model and in combination with the attached drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0026] As Figures 1 - 7 shown, the present iliosacral screw external guiding device includes a guiding assembly and a navigation guide plate 1. The navigation guide plate 1 is obtained by using a 3D printer according to the collected pelvic CT data. The navigation guide plate 1 is provided with an engaging structure for connecting the guiding assembly. The guiding assembly includes a Kirschner wire sleeve core 2, an anti-slip sleeve core 3, and a flaring core 4. A guiding channel for inserting the anti-slip sleeve core 3 is penetrated through the flaring core 4. An anti-slip channel for inserting the Kirschner wire sleeve core 2 is penetrated through the anti-slip sleeve core 3. A channel for inserting a guiding Kirschner wire is penetrated through the Kirschner wire sleeve core 2.

[0027] As Figures 1 - 4 shown, the lower edge of the anti-slip sleeve core 3 is provided with saw teeth 6 for abutting against the surface of the iliac crest bone. The length of the anti-slip sleeve core 3 is greater than the length of the flaring core 4. The length of the Kirschner wire sleeve core 2 is greater than the length of the anti-slip sleeve core 3. The outer end of the anti-slip sleeve core 3 has a first annular limiting block 7. The inner end face of the first annular limiting block 7 can abut against the outer end face of the flaring core 4. The outer end face of the Kirschner wire sleeve core 2 has a second annular limiting block 8. The inner end face of the second annular limiting block 8 can abut against the outer end face of the first annular limiting block 7. The anti-slip sleeve core 3 and the first annular limiting block 7 are integrally formed. The Kirschner wire sleeve core 2 and the second annular limiting block 8 are integrally formed.

[0028] AsFigures 5 - 8 As shown, the navigation guide 1 includes a left positioning part 9 and a right positioning part 10, a connecting block 11 is fixed on one side of the left positioning part 9, and a fixing block 12 is fixed on one side of the right positioning part 10, and the fixing block 12 has a fixing groove for one end of the connecting block 11 to be embedded, and the left positioning part 9 is connected to the right positioning part 10 through the connecting block 11 and the fixing block 12, and the navigation guide 1 is integrated with a plurality of guide sleeve cores 5, and the joint structure includes a plurality of guide sleeve cores 5, and the end of the guide sleeve core 5 has an opening, and one end of the expanded core 4 can be inserted into the guide sleeve core 5 through the opening and penetrate into the interior of the navigation guide 1, and a plurality of air holes 13 are provided on the navigation guide 1, and the air holes can improve the ventilation effect of the navigation guide, while also saving some materials and reducing the manufacturing cost.

[0029] In this embodiment, the connecting block 11 and the fixing block 12 may also be fixed by bolts.

[0030] The working principle of the utility model is as follows:

[0031] First, according to the collected CT data of the patient's pelvis, a navigation guide plate 1 that can wrap the patient's pelvis is quickly formed through a 3D printer. The entire guide device is inserted into the patient's body along the guide sleeve core 5, and the Kirschner wire is inserted into the double cortex of the ilium along the Kirschner wire sleeve core 2. During the operation, pay attention to the non-slip sleeve core 3 and the Kirschner wire sleeve core 2. After the position and direction of the Kirschner wire are verified by fluoroscopy, the Kirschner wire sleeve core 2 and the non-slip sleeve core 3 are pulled out, and the hollow screw is inserted along the flared sleeve core 4. The position, direction and length of the screw are verified again. After satisfaction, the Kirschner wire is pulled out. The incision is closed, the slope of the ilium surface, the Kirschner wire puncture is easy to slide and cause the wrong direction. This device solves the positioning and anti-slip problems. And there is no need to use expensive equipment such as navigation, the dependence on intraoperative fluoroscopy is reduced, and the difficulty of nail placement surgery can be significantly reduced, the operation time and intraoperative fluoroscopy time and frequency can be shortened, and the patient's radiation damage can be reduced.

[0032] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An extracorporeal sacroiliac screw guide device, characterized in that: The invention comprises a guide assembly and a navigation guide plate (1). The navigation guide plate (1) is obtained by using a 3D printer based on collected pelvic CT data. The navigation guide plate (1) is provided with a joint structure for connecting the guide assembly. The guide assembly comprises a Kirschner wire sleeve core (2), an anti-slip sleeve core (3), and a flared core (4). The flared core (4) is provided with a guide channel for inserting the anti-slip sleeve core (3). The anti-slip sleeve core (3) is provided with an anti-slip channel for inserting the Kirschner wire sleeve core (2). The Kirschner wire sleeve core (2) is provided with a channel for inserting the guide Kirschner wire.

2. The in vitro sacroiliac screw guide device according to claim 1, characterized in that: The joint structure comprises a plurality of guide sleeve cores (5), each of which has an opening at its end, and one end of the expanded core (4) can be inserted into the guide sleeve core (5) through the opening and penetrate into the interior of the navigation guide plate (1).

3. The in vitro sacroiliac screw guide device according to claim 2, characterized in that: The navigation guide plate (1) and the plurality of guide sleeve cores (5) are integrally printed by a 3D printer.

4. The in vitro sacroiliac screw guide device according to claim 1, characterized in that: The lower edge of the anti-slip sleeve core (3) is provided with saw teeth (6) for pressing against the surface of the ilium, the length of the anti-slip sleeve core (3) is greater than the length of the expanded core (4), and the length of the Kirschner wire sleeve core (2) is greater than the length of the anti-slip sleeve core (3).

5. The in vitro sacroiliac screw guide device according to claim 1, characterized in that: The outer end of the anti-slip sleeve core (3) has a first annular limit block (7), the inner end surface of which can abut against the outer end surface of the expanded core (4); the outer end surface of the Kirschner wire sleeve core (2) has a second annular limit block (8), the inner end surface of which can abut against the outer end surface of the first annular limit block (7).

6. The in vitro guiding device for sacroiliac screws according to claim 4, characterized in that: The anti-slip sleeve core (3) and the first annular limiting block (7) are integrated, and the Kirschner wire sleeve core (2) and the second annular limiting block (8) are integrated.

7. The in vitro sacroiliac screw guiding device according to claim 1, characterized in that: The navigation guide plate (1) comprises a left positioning portion (9) and a right positioning portion (10); a connecting block (11) is fixed to one side of the left positioning portion (9); a fixing block (12) is fixed to one side of the right positioning portion (10); and the fixing block (12) is provided with a fixing groove for one end of the connecting block (11) to be inserted.

8. The in vitro sacroiliac screw guiding device according to claim 7, characterized in that: The navigation guide plate (1) is provided with a plurality of ventilation holes (13).

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