Reaming device for implanting fixed sliding sleeve in low-incisura femoral neck fracture

Abstract

The utility model discloses a broaching device for implanting a fixed sliding sleeve in a low-incisura femoral neck fracture, which comprises a guider, a drill bit is mounted on the guider, a limiter is mounted on the drill bit, the limiter is connected with a limiter nut, the guider comprises a T-shaped holding rod, the T-shaped holding rod is connected with a sleeve, and the T-shaped holding rod is connected with the sleeve. A metal plate is installed at the bottom of the sleeve, an arc-shaped groove is formed in the metal plate, and the drill bit is installed on the sleeve. According to the device, matched tools required by implantation of the low-incisura femoral neck fracture internal fixation system are perfected, so that reaming operation before implantation of the sliding sleeve is more convenient. And by using the guider, sliding is reduced, the drilling stability is improved, and it is guaranteed that the hole is matched with the sliding sleeve.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a hole enlarging device used for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture. Background Art

[0002] The low-profile femoral neck fracture internal fixation system is a new type of internal fixation device for femoral neck fractures, which consists of a sliding sleeve, a dynamic rod, an anti-rotation screw and a locking screw. In the biomechanical test of femoral neck fracture internal fixation, compared with the traditional femur neck internal fixation system (Femur Neck System, FNS), the low-profile femoral neck fracture internal fixation system has the advantages of anti-rotation, anti-shear force and fracture end compression of FNS, while providing greater overall structural stability, avoiding the problem of nail plate-femur misfit caused by human femoral differences, reducing the risk of nail plate breakage and skin irritation, and can better treat femoral neck fractures.

[0003] However, there is a lack of matching tools for reaming before implantation of the low-profile femoral neck fracture internal fixation system. The sliding sleeve of the low-profile femoral neck fracture internal fixation system is mainly composed of an upper cylindrical barrel and a lower convex body. Before implantation into the femur, two overlapping circular holes need to be drilled on the outside of the femur under the guidance of a guide pin. The reaming device for the upper hole is compatible with the FNS reaming drill, but there is currently no matching reaming device for the lower hole. Since the edge of the circular cross-section of the upper barrel passes through the center of the lower convex cross-section, slippage may occur when the drill is used alone to reame, and it is difficult to ensure that the upper and lower holes are parallel without the guidance of a guide pin during reaming. The hole and the sliding sleeve do not match, resulting in the inability to implant the fixation system. Utility Model Content

[0004] The purpose of the utility model is to provide a hole reaming device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture, so as to solve the problems mentioned in the background technology. To achieve the above purpose, the utility model provides the following technical solution: the hole reaming device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture comprises a guide, a drill bit is installed on the guide, a limiter is installed on the drill bit, the limiter is connected to the limiter nut, the guide comprises a T-shaped grip rod, the T-shaped grip rod is connected to the sleeve, a metal plate is installed at the bottom of the sleeve, an arc-shaped groove is opened on the metal plate, and the drill bit is installed on the sleeve.

[0005] Preferably, the sleeve comprises an upper sleeve portion and a lower sleeve portion, an upper guide hole and a lower guide hole are opened on the upper sleeve portion and the lower sleeve portion, the rear end of the upper sleeve portion is enlarged, and the rear end of the lower sleeve portion is a beveled surface, and the beveled surface forms an angle of 55°-65° with the main axis of the sleeve.

[0006] Preferably, an angle of 30°-40° is provided between the T-shaped gripping rod and the main axis of the sleeve.

[0007] Preferably, the drill bit is cylindrical as a whole, one end of the drill bit is a cutting end formed by a drill blade, and the other end is a mounting end, and the mounting end is provided with a depth measuring scale.

[0008] Preferably, the limiter is cylindrical as a whole, with an internal hollow structure, penetrating from left to right, the left end of the limiter is an enlarged limiter structure, the middle part of the limiter is provided with an external thread, and the limiter is sleeved on the drill bit.

[0009] Preferably, the limiter nut is cylindrical as a whole, with an internal hollow structure, which is passed through from left to right. A groove is provided on the surface of the limiter nut, and an internal thread that cooperates with the external thread of the limiter is provided on the inner side of the limiter nut.

[0010] The technical effects and advantages of the utility model: the device improves the supporting tools required for implantation of the low-profile femoral neck fracture internal fixation system, making the hole expansion operation before the sliding sleeve implantation more convenient. The use of the guide reduces sliding, improves the stability of the drilling, and ensures that the hole matches the sliding sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model;

[0012] Figure 2 This is a front view of the sleeve of the utility model;

[0013] Figure 3 It is a right side view of the sleeve of the utility model;

[0014] Figure 4 This is a schematic diagram of the installation of the drill bit and the stopper of the utility model;

[0015] Figure 5 This is a schematic diagram of the drill bit structure of the utility model;

[0016] Figure 6 This is a schematic diagram of the structure of the limiter of the utility model;

[0017] Figure 7 It is a schematic diagram of the limiter nut structure of the utility model.

[0018] In the figure, 1. guide; 2. drill bit; 3. limiter; 4. limiter nut; 5. T-shaped grip; 6. sleeve; 7. metal plate; 8. arc-shaped groove; 9. upper guide hole; 10. lower guide hole; 11. chamfered surface; 12. cutting end; 13. mounting end; 14. depth measurement scale; 15. limit structure; 16. external thread; 17. groove; 18. guide pin; 19. upper part of sleeve; 20. lower part of sleeve. DETAILED DESCRIPTION

[0019] In order to make the technical means for realizing the utility model, creative features, objectives and effects easy to understand, the utility model is further explained below in conjunction with specific diagrams. In the description of the utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection or a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two components.

[0020] Example 1

[0021] like Figure 1-Figure 3 The reaming device shown in the figure is used for implantation of a sliding sleeve for internal fixation of a low-profile femoral neck fracture, and includes a guide 1 and a drill bit 2. A limiter 3 is installed on the drill bit 2, and the limiter 3 is connected to a limiter nut 4. The guide 1 includes a T-shaped grip rod 5, and the T-shaped grip rod 5 is connected to a sleeve 6. A metal plate 7 is installed at the bottom of the sleeve 6, and an arc-shaped groove 8 is opened on the metal plate 7. The drill bit 2 is installed on the sleeve 6.

[0022] Example 2

[0023] like Figure 1-Figure 7 The reaming device for low-profile femoral neck fracture internal fixation sliding sleeve implantation shown in the figure comprises a guide 1 and a drill bit 2, a limiter 3 is installed on the drill bit 2, the limiter 3 is connected to the limiter nut 4, the guide 1 comprises a T-shaped grip 5, the T-shaped grip 5 is connected to a sleeve 6, a metal plate 7 is installed at the bottom of the sleeve 6, an arc groove 8 is opened on the metal plate 7, the arc groove 8 is the same as the curvature of the outer side of the femur, and the guide 1 can be kept in a vertical position, and the T-shaped grip 5 is used for hand-held installation of the guide 1;

[0024] The sleeve 6 includes an upper sleeve portion 19 and a lower sleeve portion 20, and an upper guide hole 9 and a lower guide hole 10 are formed on the upper sleeve portion 19 and the lower sleeve portion 20. The rear end of the upper sleeve portion 19 is enlarged, and the rear end of the lower sleeve portion 20 is a beveled surface 11. The beveled surface 11 forms an angle of 55°-65° with the main axis of the sleeve 6, which can better fit the physiological curvature of the outer cortex of the proximal femur. An angle of 30°-40° is set between the T-shaped grip 5 and the main axis of the sleeve 6; the drill bit 2 can be installed in the lower guide hole 10 to perform drilling;

[0025] The drill bit 2 is cylindrical in shape as a whole, with one end of the drill bit 2 being a cutting end 12 formed by a drill blade, and the other end being a mounting end 13. A depth measuring scale 14 is provided on the mounting end 13, and the depth measuring scale 14 is used to measure the penetration depth of the drill bit 2;

[0026] The limiter 3 is cylindrical as a whole, with an internal hollow structure, which is passed through from left to right. The left end of the limiter 3 is an enlarged limiter structure 15. An external thread 16 is provided in the middle of the limiter 3, and the limiter 3 is sleeved on the drill bit 6; the limiter nut 4 is cylindrical as a whole, with an internal hollow structure, which is passed through from left to right. A groove 17 is provided on the surface of the limiter nut 4, and the groove 17 can increase the friction of holding. An internal thread is provided on the inner side of the limiter nut 4, which cooperates with the external thread 16 to realize the threaded connection between the limiter 15 and the limiter nut 4.

[0027] The process flow and working principle of the utility model are as follows: Figure 1 As shown, the stopper 3 is inserted along the drill bit 2, and the stopper nut 4 and the stopper 3 thread are completely tightened to complete the installation of the reamer; the upper hole is drilled on the bone with a compatible traditional FNS reamer and the guide pin 18 in the middle is retained, the beveled surface 11 of the guide 1 is directed toward the outside of the femur, and the upper guide hole 9 is moved toward the femur through the guide pin 18, so that the arc groove 8 of the metal plate 7 is against the femur and the beveled surface 11 is completely fitted with the outside of the femur, the reamer is connected to the medical bone drill, and the lower hole is drilled along the lower guide hole 10 of the guide 1, and the limiting structure 15 of the stopper 3 contacts the lower guide hole 10 during the drilling process, and the stopper 3 can be limited in cooperation with the stopper nut 4 to realize the directional drilling of the drill bit 2, and the depth measuring scale 14 can display the drilling depth.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hole enlarging device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture, comprising a guide, characterized in that: A drill bit is installed on the guide, a limiter is installed on the drill bit, the limiter is connected to the limiter nut, the guide includes a T-shaped grip rod, the T-shaped grip rod is connected to a sleeve, a metal plate is installed at the bottom of the sleeve, an arc-shaped groove is opened on the metal plate, and the drill bit is installed on the sleeve.

2. The hole enlarging device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture according to claim 1, characterized in that: The sleeve comprises an upper sleeve portion and a lower sleeve portion, wherein an upper guide hole and a lower guide hole are formed on the upper sleeve portion and the lower sleeve portion, the rear end of the upper sleeve portion is enlarged, and the rear end of the lower sleeve portion is a beveled surface, which forms an angle of 55°-65° with the main axis of the sleeve.

3. The hole enlarging device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture according to claim 1, characterized in that: An included angle of 30°-40° is provided between the T-shaped gripping rod and the main axis of the sleeve.

4. The hole enlarging device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture according to claim 1, characterized in that: The drill bit is cylindrical in shape as a whole, one end of the drill bit is a cutting end formed by a drill blade, and the other end is a mounting end, and a depth measuring scale is provided on the mounting end.

5. The hole enlarging device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture according to claim 1, characterized in that: The limiter is cylindrical in shape as a whole, with a hollow structure inside, and is passed through from left to right. The left end of the limiter is an enlarged limiter structure, and the middle part of the limiter is provided with an external thread. The limiter is sleeved on the drill bit.

6. The hole enlarging device for implanting a sliding sleeve for internal fixation of a low-profile femoral neck fracture according to claim 5, characterized in that: The limiter nut is cylindrical in shape as a whole, has an internal hollow structure, and is through-through from left to right. A groove is provided on the surface of the limiter nut, and an internal thread that cooperates with the external thread of the limiter is provided on the inner side of the limiter nut.

Images