A positioning assembly for a femoral neck cannulated screw guide

Abstract

The utility model relates to a kind of positioning assembly for femoral neck hollow screw guide needle, including fixed seat, guide pipe and positioning frame, the side of fixed seat is wedge-shaped, and the inclined surface of fixed seat is equipped with the recess matched with femur, fixed seat is fixed on the outer cortical bone of trochanter of femur, the opposite side between the wedge-shaped inclined surface of one end of guide pipe and fixed seat is rotatably connected by locking assembly, one end of positioning frame is sleeved in the other end of guide pipe.The utility model can be more conveniently adjusted the angle of guide needle in guide pipe under the assistance perspective of C-arm machine, and by rotating positioning frame, it is guaranteed that under the viewing of orthotopic and lateral, guide needle is in the appropriate position in femoral neck, then guide pipe and fixed seat are locked by cooperating locking assembly, the accurate needle insertion of guide needle can be realized, it is guaranteed to succeed once, greatly improve surgical efficiency, reduce the pain and unnecessary damage of multiple needle insertion and multiple perspective to patient, it is cheap several times compared with computer navigation, greatly reduce treatment cost.

Description

Technical Field

[0001] This utility model relates to the field of fracture positioning technology, and in particular to a positioning component for a hollow nail guide pin for the femoral neck. Background Technology

[0002] Femoral neck fracture is a common orthopedic condition, frequently occurring in middle-aged and elderly individuals. Without timely treatment, it can lead to nonunion and avascular necrosis of the femoral head. The most common clinical approach is surgical internal fixation. After satisfactory reduction of the femoral neck fracture, three guide pins are inserted at appropriate locations within the femoral neck, followed by the insertion of cannulated screws along the guide pins to ensure successful fracture healing. During surgery, the guide pins must be inserted at the correct angle. Currently, in clinical practice, manual blind insertion followed by X-ray fluoroscopy to verify the guide pin placement is often imprecise, requiring multiple insertions and fluoroscopy to pinpoint the exact location. This not only reduces surgical efficiency but also increases trauma to the patient. The femoral neck has limited spaces for cannulated screw fixation (especially in children where the femoral neck is thinner and the requirements are even higher), and repeated insertions can weaken the bone strength of the femoral neck, affecting the stability of the cannulated screw fixation. To improve surgical efficiency, surgical navigation systems are now widely used to achieve accurate and rapid placement of guide pins. However, these systems are expensive, costing tens of thousands of yuan, which significantly increases treatment costs and places an additional burden on patients. Furthermore, navigation and positioning take a considerable amount of time; although the time for placing the guide pin and hollow screw is shortened, the overall surgical time remains the same. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a positioning component for a hollow screw guide pin in the femoral neck, addressing the shortcomings of the prior art.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A hollow screw guide pin positioning component for internal fixation of femoral neck fracture includes a fixation seat, a guide tube for the hollow screw guide pin to pass through, and a positioning frame. The fixation seat is wedge-shaped, and the inclined surface of the fixation seat that is close to the femur is provided with a groove that matches the femur. The fixation seat is fixed to the lateral cortical bone below the tubercles. One end of the guide tube is rotatably connected to the opposite side of the wedge-shaped inclined surface of the fixation seat through a locking component. One end of the positioning frame is sleeved on the other end of the guide tube, and the positioning frame can rotate around the central axis of the guide tube while also being fixed.

[0005] The beneficial effects of this invention are as follows: The positioning component for the hollow screw guide pin in the femoral neck is rotatably connected to one end of the guide tube via the fixed base. This allows for convenient adjustment of the insertion angle of the hollow screw guide pin within the guide tube under C-arm fluoroscopy. By rotating the positioning frame, the hollow screw guide pin is ensured to be in the appropriate position within the femoral neck in both anteroposterior and lateral views. Furthermore, the locking component secures the guide tube to the fixed base, achieving precise insertion of the hollow screw guide pin and guaranteeing success on the first attempt. This significantly improves surgical efficiency, reduces the pain and unnecessary damage to the patient caused by repeated insertions and fluoroscopy, is several times cheaper than computer-guided systems, greatly reduces treatment costs, and significantly shortens the overall surgical time. Its simple structure and ease of use make it suitable for widespread application.

[0006] Based on the above technical solution, the present invention can be further improved as follows:

[0007] Furthermore, the four corners of the fixation base are provided with fixation holes, and fixation nails are provided in the fixation holes. The fixation base can be fixed to the femur by the fixation nails.

[0008] The beneficial effect of the above-mentioned further solution is that by setting the fixing hole, the fixing seat can be fixed to the femur relatively easily, so as to provide stable support for the guide tube and the positioning frame.

[0009] Furthermore: the locking assembly includes a locking knob and a universal ball. The opposite side of the wedge-shaped inclined surface on the fixed base is provided with a rotating groove that matches the universal ball. The universal ball is disposed in the rotating groove, and the locking knob can lock the universal ball in the rotating groove.

[0010] The beneficial effects of the above-mentioned further solution are: by setting a universal ball and a rotating groove, the angle of the guide tube can be adjusted more conveniently. At the same time, the universal ball can be locked in the rotating groove by the locking knob to fix the guide tube.

[0011] Furthermore: the outer side wall of the rotating groove is provided with an external thread, and the inner side wall of the locking knob is provided with an internal thread that matches the external thread, and the locking knob is threadedly connected to the rotating groove.

[0012] The beneficial effects of the above-mentioned further solution are: by setting the external thread and the internal thread, on the one hand, it is convenient to operate and can quickly lock and loosen the locking knob and the rotating groove; on the other hand, it can ensure the firmness of fixing the universal ball end of the guide tube.

[0013] Furthermore, the outer contour of the locking knob is elliptical or polygonal.

[0014] The beneficial effect of the above-mentioned further solution is that by setting the outer contour of the locking knob to an ellipse or polygon, it can ensure that the locking knob plays a non-slip role when tightening or loosening, thereby improving the convenience and accuracy of operation during surgery.

[0015] Furthermore: one end of the positioning frame is provided with a slot, and the opening of the slot is provided with a clamping piece for clamping or releasing the guide tube. The end of the slot connected to the clamping piece is formed with an arc-shaped groove adapted to the guide tube. The guide tube can be inserted into the arc-shaped groove, and one end of the positioning frame can rotate around the other end of the guide tube along the central axis of the guide tube. A gap is left between the other end of the clamping piece and the other end of the slot.

[0016] The beneficial effects of the above-mentioned further solution are: by setting the slot and clamp, the guide tube can be inserted into the slot and clamped, and at the same time, the positioning frame can be rotated easily when adjusting the position of the positioning frame, making the operation convenient.

[0017] Further: The positioning frame includes a vertical section, a horizontal section and an inclined section. The two ends of the inclined section are connected to the vertical section and the horizontal section respectively. The slot is disposed at the lower part of the vertical section, and the horizontal section is provided with a developing hole.

[0018] The beneficial effects of the above-mentioned further solution are: by setting the vertical section, horizontal section and inclined section, on the one hand, the vertical section can be rotatably connected to the guide tube, and on the other hand, rotating the entire positioning frame can facilitate the positioning and calibration of the hollow nail guide pin in the up, down and left and right positions of the horizontal section, which is very convenient.

[0019] Furthermore, one end of the positioning frame is integrally formed with one end of the clamping piece, and the clamping piece is made of an elastic material.

[0020] The beneficial effects of the above-mentioned further solution are: by integrally molding one end of the positioning frame and one end of the clamping piece, the connection between the two can be made more stable and more aesthetically pleasing, and the clamping piece is made of elastic material, which can facilitate the insertion of the guide tube and the clamping of the guide tube.

[0021] Furthermore, the horizontal segment is provided with multiple first through holes.

[0022] The beneficial effects of the above-mentioned further solution are: by setting multiple first through holes, the entire positioning frame can be made lighter and easier to operate, and the support stability of the guide tube can also be improved.

[0023] Furthermore, the positioning component also includes a porous sleeve, on which a plurality of second through holes adapted to Kirschner wires are arranged in parallel at intervals.

[0024] The beneficial effect of the above-mentioned further solution is that after the first hollow nail guide pin is inserted, the remaining hollow nail guide pins can be inserted smoothly by rotating the multi-hole sleeve. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the positioning component for a hollow nail guide pin in the femoral neck according to an embodiment of the present invention;

[0026] Figure 2 This is a partial structural schematic diagram of a locking assembly according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the fitting structure between the porous sleeve and the femur according to an embodiment of the present invention.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Fixing base, 2. Guide tube, 3. Positioning frame, 4. Femur, 5. Locking knob, 6. Universal ball, 7. Rotating groove, 8. Slot, 9. Clip, 10. Development hole, 11. Multi-hole sleeve. Detailed Implementation

[0030] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0031] like Figures 1 to 3 As shown, a positioning assembly for a hollow screw guide pin in the femoral neck includes a fixation base 1, a guide tube 2 for the hollow screw guide pin to pass through, and a positioning frame 3. The fixation base 1 is wedge-shaped, and the inclined surface of the fixation base 1 that is close to the femur is provided with a groove that matches the femur 4. The fixation base 1 is fixed to the lateral cortical bone below the tuberosity. One end of the guide tube 2 is rotatably connected to the opposite side of the wedge-shaped inclined surface on the fixation base 1 through a locking assembly. One end of the positioning frame 3 is connected to the other end of the guide tube 2, and the positioning frame 3 can rotate around the central axis of the guide tube 2 while also being fixed.

[0032] This invention relates to a hollow screw guide pin positioning assembly for internal fixation of femoral neck fractures. The assembly is rotatably connected to one end of the guide tube 2 via a fixation base 1. This allows for convenient adjustment of the hollow screw guide pin's insertion angle within the guide tube 2 under C-arm fluoroscopy. The rotating positioning frame 3 ensures the hollow screw guide pin is positioned appropriately within the femoral neck in both anteroposterior and lateral views. The locking assembly further secures the guide tube 2 to the fixation base 1, enabling precise insertion of the hollow screw guide pin and guaranteeing success on the first attempt. This significantly improves surgical efficiency, reduces patient suffering and unnecessary harm caused by repeated insertions and fluoroscopy, is several times cheaper than computer-guided fixation, greatly reduces treatment costs, and significantly shortens the overall surgical time. Its simple structure and ease of use make it suitable for widespread application.

[0033] In one or more embodiments of this utility model, fixing holes are provided at the four corners of the fixing base 1, and fixing nails are provided in the fixing holes. The fixing base 1 can be fixed to the femur by the fixing nails. By providing fixing holes, the fixing base 1 can be easily fixed to the femur, so as to provide stable support for the guide tube 2 and the positioning frame 3.

[0034] It should be noted that, in order to limit the position of the positioning frame 3 on the guide tube 2 and prevent it from getting too close to the locking knob 5 and affecting its adjustment, a limiting part is provided on the guide tube 2. When the positioning frame 3 is in the limiting part and not engaged, rotating the positioning frame 3 will not cause it to move towards the universal ball 6, thus leaving room for the adjustment of the locking knob 5. In practice, in order to reduce the weight of the entire guide tube 2 and avoid too many parts, in this embodiment, the guide tube 2 is set into two sections (integrated molding), with the diameter of the section closer to the universal ball 6 being slightly larger than that of the section closer to the positioning frame. This forms a limiting part at the junction of the two sections, thereby preventing the positioning frame 3 from moving towards the universal ball 6 during rotation.

[0035] Specifically, in one or more embodiments of this utility model, the locking assembly includes a locking knob 5 and a universal ball 6. A rotating groove 7 matching the universal ball 6 is provided on the opposite side of the wedge-shaped inclined surface of the fixing base 1. The universal ball 6 is disposed within the rotating groove 7, and the locking knob 5 can lock the universal ball 6 within the rotating groove 7. By providing the universal ball 6 and the rotating groove 7, the angle of the guide tube 2 can be rotated relatively easily. Furthermore, after the angle of the guide tube 2 is adjusted, the locking knob 5 can be used to fix the guide tube 2.

[0036] In this embodiment of the present invention, the fixation seat 1 is made by 3D printing, and the inclined surface of the fixation seat 1 that is close to the femur is provided with a groove that matches the femur 4. Fixing holes are provided at the four corners of the fixation seat, and fixing nails are installed in the fixing holes. This can ensure that the fixation seat 1 is completely fixed to the patient's femur by fixing nails, and ensure the connection stability between the two.

[0037] In one or more embodiments of this utility model, an external thread is provided on the outer side wall of the rotating groove 7, and an internal thread matching the external thread is provided on the inner side wall of the locking knob 5. The locking knob 5 is threadedly connected to the rotating groove 7. By providing the external and internal threads, on the one hand, operation is convenient, and the locking knob 5 and the rotating groove 7 can be quickly locked and released; on the other hand, it can ensure the firmness of fixing the end of the guide tube 2 with the universal ball.

[0038] In one or more embodiments of this utility model, the outer contour of the locking knob 5 is elliptical or polygonal. By setting the outer contour of the locking knob 5 to an elliptical or polygonal shape, an anti-slip function can be ensured when tightening or loosening the locking knob 5, thereby improving the convenience and precision of operation during surgery.

[0039] In practice, a friction surface (texture, surface layer, etc. to increase friction) can also be provided on the surface of the locking knob 5. Of course, other methods can also be used, which will not be listed here.

[0040] In one or more embodiments of this utility model, one end of the positioning frame 3 is provided with a slot 8, and the opening of the slot 8 is provided with a clamping piece 9 for clamping or releasing the guide tube 2. The end of the slot 8 connected to the clamping piece 9 forms an arc-shaped groove adapted to the guide tube 2, allowing the guide tube 2 to be inserted into the arc-shaped groove. The end of the positioning frame 3 with the slot 8 can rotate around the other end of the guide tube 2 along the central axis of the guide tube 2. A gap is left between the other end of the clamping piece 9 and the other end of the slot 8. By providing the slot 8 and the clamping piece 9, the guide tube 2 can be inserted into the slot 8 and tightened. Simultaneously, it facilitates rotation of the positioning frame 3 when adjusting its positioning position, making operation convenient. In practice, the clamping piece 9 can be made of plastic or other materials, and an appropriate thickness can be set according to different materials to ensure it has a certain degree of elasticity.

[0041] Optionally, in one or more embodiments of this utility model, the positioning frame 3 includes a vertical section, a horizontal section, and an inclined section. The two ends of the inclined section are respectively connected to the vertical and horizontal sections. The slot 8 is disposed at the lower part of the vertical section, and a developing hole 10 is provided on the horizontal section. By providing the vertical, horizontal, and inclined sections, the vertical section can be rotatably connected to the guide tube 2. Simultaneously, rotating the entire positioning frame 3 facilitates the positioning and calibration of the hollow nail guide pin's vertical, horizontal, and lateral positions via the horizontal section, which is very convenient.

[0042] In one or more embodiments of this utility model, the end of the positioning frame 3 with the developing hole 10 is integrally formed with one end of the clamping piece 9, and the clamping piece 9 is made of an elastic material. By integrally forming the end of the positioning frame 3 with the developing hole 10 with one end of the clamping piece 9, the connection between the two can be made more stable and more aesthetically pleasing, and the clamping piece 9 being made of an elastic material facilitates the insertion of the guide tube 2 and the clamping of the guide tube 2.

[0043] Optionally, in one or more embodiments of this utility model, a plurality of first through holes are provided on the horizontal section. By providing a plurality of first through holes, the entire positioning frame 3 can be made lighter, easier to operate, and the support stability of the guide tube 2 can also be improved.

[0044] Optionally, in one or more embodiments of this utility model, the positioning component further includes a porous sleeve 11, on which a plurality of second through holes adapted to Kirschner wires are arranged in parallel at intervals. By providing the porous sleeve 11, after the first hollow nail guide pin is inserted through the guide tube 2, the remaining hollow nail guide pins can be smoothly inserted by rotating the porous sleeve 11.

[0045] Since the second through holes in the multi-hole sleeve 11 are parallel to each other, after the first hollow nail guide pin is inserted through the guide tube 2, the fixing seat 1 is removed, and then the multi-hole sleeve 11 is put on the first hollow nail guide pin so that the first hollow nail guide pin passes through one of the second through holes on the multi-hole sleeve 11. Then, the multi-hole sleeve 11 is rotated to the appropriate position in sequence, and the remaining hollow nail guide pins are driven in to complete the insertion of multiple hollow nail guide pins.

[0046] In use, first place the fixation seat 1 close to the outer side of the femoral tuberosity. At this time, the locking component is in the loose state, that is, the universal ball end of the guide tube 2 can rotate in the rotating groove. Then, put the slot end on the vertical section of the positioning frame 3 onto the other (tail) end of the guide tube 2. Use anteroposterior fluoroscopy to check whether the imaging hole end of the positioning frame 3 is in a suitable position in the femoral neck. Then use lateral fluoroscopy to check whether the end of the positioning frame 3 with imaging hole 10 is in a suitable position in the femoral neck. After the anteroposterior and lateral positions are satisfactory, adjust the locking knob 5 and lock the end of the guide tube 2 with universal ball 6 into the rotating groove 7. At this time, the guide tube 2 is fixed. The fixation seat 1 is fixed on the femur by four fixing pins to keep it stable. Use anteroposterior and lateral fluoroscopy again to check whether the position is satisfactory. Then insert the first hollow nail guide pin into the femoral neck through the guide tube 2. Then remove the fixation base 1, guide tube 2 and positioning frame 3, then put the multi-hole sleeve 11 on the first hollow nail guide pin, rotate the multi-hole sleeve 11 to the appropriate position, and after fluoroscopic examination, insert the second and third hollow nail guide pins into the femoral neck in the appropriate position. Finally, insert three hollow screws along the three guide pins for internal fixation.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., 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 positioning assembly for a guide pin of a hollow screw in the femoral neck, characterized in that: The device includes a fixation base (1), a guide tube (2) for the hollow nail guide pin to pass through, and a positioning frame (3). The fixation base (1) is wedge-shaped, and the inclined surface of the fixation base (1) that is close to the femur has a groove that matches the femur (4). The fixation base (1) is fixed to the lateral cortical bone below the tuberosity. One end of the guide tube (2) is rotatably connected to the opposite side of the wedge-shaped inclined surface of the fixation base (1) through a locking assembly. One end of the positioning frame (3) is connected to the other end of the guide tube (2), and the positioning frame (3) can rotate around the central axis of the guide tube (2) while also being fixed.

2. The positioning component according to claim 1, characterized in that: Fixing holes are provided at the four corners of the fixation base (1), and fixing nails are provided in the fixing holes. The fixation base (1) can be fixed to the femur by the fixing nails.

3. The positioning component according to claim 1, characterized in that: The locking assembly includes a locking knob (5) and a universal ball (6). The opposite side of the wedge-shaped inclined surface of the fixed base (1) is provided with a rotating groove (7) that matches the universal ball (6). The universal ball (6) is disposed in the rotating groove (7). The locking knob (5) can lock the universal ball (6) in the rotating groove (7).

4. The positioning component according to claim 3, characterized in that: The outer side wall of the rotating groove (7) is provided with an external thread, and the inner side wall of the locking knob (5) is provided with an internal thread that matches the external thread. The locking knob (5) is threadedly connected to the rotating groove (7).

5. The positioning component according to claim 3, characterized in that: The outer contour of the locking knob (5) is elliptical or polygonal.

6. The positioning component according to claim 1, characterized in that: One end of the positioning frame (3) is provided with a slot (8), and the opening of the slot (8) is provided with a clamping piece (9) for clamping or releasing the tail end of the guide tube (2). At the end where the slot (8) is connected to the clamping piece (9), an arc-shaped groove adapted to the guide tube (2) is formed. The guide tube (2) can be inserted into the arc-shaped groove. The end of the positioning frame (3) with the slot (8) can rotate around the other end of the guide tube (2) about the central axis of the guide tube (2). There is a gap between the other end of the clamping piece (9) and the other end of the slot (8).

7. The positioning component according to claim 6, characterized in that: One end of the positioning frame (3) is integrally formed with one end of the clamp (9), and the clamp (9) is made of elastic material.

8. The positioning component according to claim 7, characterized in that: The positioning frame (3) includes a vertical section, a horizontal section and an inclined section. The two ends of the inclined section are connected to the vertical section and the horizontal section respectively. The slot (8) is located at the lower part of the vertical section, and the horizontal section is provided with a developing hole (10).

9. The positioning component according to claim 8, characterized in that: The horizontal section is provided with multiple first through holes.

10. The positioning component according to any one of claims 1-9, characterized in that: It also includes a porous sleeve (11), on which a plurality of second through holes adapted to Kirschner wires are arranged in parallel at intervals.

Images