Proximal femoral anti-rotation intramedullary nail

Abstract

The present application relates to the technical field of intramedullary nail, in particular to a proximal femur anti-rotation intramedullary nail, which comprises a round rod, an auxiliary rotating assembly is arranged in the inside of the round rod, a fixed assembly for fixing the rotating angle of two ends is arranged at the upper end of the round rod, a shielding assembly is arranged at the upper end of the fixed assembly, the rotating assembly comprises a round cavity arranged in the inside of the round rod, rotating grooves are arranged at both ends of the round rod, a round rod is rotatably connected in the inside of the rotating groove, a ring groove is arranged on the outer wall of the round rod, the fixed plug fixed on the surface of the sleeve ring is inserted into the insertion hole, the fixed plug is inserted into the rotating groove and adheres to the round rod, the round rod is fixed in the inside of the rotating groove through the fixed plug, the rotating angle of the distal end rotating block and the proximal end rotating block can be fixed, the rotating of the distal end rotating block and the proximal end rotating block in the femur can be prevented, the friction between the intramedullary nail and the internal tissue of the bone can be effectively prevented, and a series of influences caused by the friction of the internal tissue of the bone can be avoided.

Description

Technical Field

[0001] This invention relates to the field of intramedullary nail technology, specifically to a proximal femoral antirotation intramedullary nail. Background Technology

[0002] Anti-rotation intramedullary nails are medical devices used for internal fixation of fractures. They are made by implanting a specially designed intramedullary nail into the medullary cavity and using its unique design to achieve stable fixation of the fracture site. They can effectively control the rotation and shortening of the fracture site, provide a stable mechanical environment for fracture healing, promote callus growth and healing at the fracture ends, and reduce the risk of complications such as nonunion and malunion.

[0003] For example, a finely adjustable rotatable intramedullary nail with publication number CN211355816U can be rotated under local anesthesia by rotating the nut, causing the rotating rod to rotate and driving the rotating head to rotate, thereby causing the lower nail rod to rotate and achieving free rotation of the intramedullary nail, thus correcting postoperative rotational deformity. However, because one end of the intramedullary nail is designed to be rotatable, it will automatically rotate when the intramedullary nail is compressed inside the bone. This will cause the intramedullary nail to rub against the internal bone tissue. Such friction may damage the blood vessels of the endosteal membrane, affect the blood supply to the fracture ends, delay callus formation, and increase the risk of fracture nonunion. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a proximal femoral anti-rotation intramedullary nail.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a proximal femoral antirotation intramedullary nail, comprising a round rod, wherein a rotating component for assisting rotation is provided inside the round rod, a fixing component for fixing the rotation angle at both ends is provided at the upper end of the round rod, and a shielding component is provided at the upper end of the fixing component.

[0006] The rotating assembly includes a circular cavity inside a round rod. Both ends of the round rod have rotating grooves. A rotating rod is rotatably connected inside the rotating groove. An annular groove is formed on the outer wall of the rotating rod. A fixing ring is fixedly sleeved inside the rotating groove. The other ends of the two rotating rods are respectively fixedly connected to a distal rotating block and a proximal rotating block. Threaded holes are formed on the surfaces of the distal rotating block and the proximal rotating block. Screws are threaded into the internal threads of the threaded holes.

[0007] The fixing assembly includes two collars that are movably fitted onto the inner wall of the circular cavity. A threaded hole is provided at the center of each collar. A rotating bar is inserted into the inside of each collar. A fixing thread is provided on the surface of the rotating bar. Two fixing blocks are symmetrically fixedly connected to the surface of the collar. Insertion holes are provided on the inner walls at both ends of the circular cavity.

[0008] Specifically, the retaining ring is engaged inside the ring groove, and the retaining ring matches the ring groove.

[0009] Specifically, the fixing block is inserted into the insertion hole, and the insertion hole is connected to the rotating groove.

[0010] Specifically, the upper end of the rotating bar extends through the proximal rotating block to the outside, and the two fixing threads on the surface of the rotating bar are arranged in opposite directions.

[0011] Specifically, the shielding assembly includes a fixing ring, which is fixedly connected to the upper end of the proximal rotating block. The upper end of the fixing ring has a clamping groove, and a rotating piece is engaged inside the clamping groove. The rotating piece has a clamping hole inside, and a clamping strip is inserted inside the clamping hole. A threaded cap is threadedly connected to the outer wall of the fixing ring, and a slot is formed inside the threaded cap.

[0012] Specifically, the clamping strip is fixedly connected to the upper end of the rotating strip, and the upper end of the clamping strip is inserted into the slot.

[0013] The beneficial effects of this invention are:

[0014] (1) The intramedullary nail for proximal femoral antirotation described in this invention uses a collar to drive a fixed plug fixed on the surface to be inserted into the insertion hole, so that the fixed plug is inserted into the rotating groove and fits against the rotating rod. The rotating rod is fixed inside the rotating groove by the fixed plug, which can fix the rotation angle of the distal rotating block and the proximal rotating block. This can prevent the distal rotating block and the proximal rotating block from rotating inside the femur, effectively preventing the intramedullary nail from rubbing against the internal tissue of the bone, and avoiding a series of effects caused by the friction of the internal tissue of the bone.

[0015] (2) The intramedullary nail for preventing rotation of the proximal femur described in this invention, after the rotation adjustment of the rotating bar is completed, the rotating plate is inserted into the clamping groove, and then the threaded cap is threaded to the outside of the fixing ring, so that the rotating plate and clamping bar are shielded, preventing these components from having abnormal effects inside the femur. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 A schematic cross-sectional structure of a proximal femoral anti-rotation intramedullary nail provided by the present invention. Figure 1 ;

[0018] Figure 2 An external view of a proximal femoral anti-rotation intramedullary nail provided by the present invention;

[0019] Figure 3 A schematic cross-sectional structure of a proximal femoral anti-rotation intramedullary nail provided by the present invention. Figure 2 ;

[0020] Figure 4 A schematic diagram of the rotating strip structure of a proximal femoral anti-rotation intramedullary nail provided by the present invention;

[0021] Figure 5 This invention provides a schematic diagram of the proximal rotating block structure of a proximal femoral anti-rotation intramedullary nail;

[0022] Figure 6 This is a schematic diagram of the rotating plate structure of a proximal femoral anti-rotation intramedullary nail provided by the present invention.

[0023] In the diagram: 1. Round rod; 2. Rotating assembly; 21. Round cavity; 22. Rotating groove; 23. Round rod; 24. Ring groove; 25. Retaining ring; 26. Distal rotating block; 27. Proximal rotating block; 28. Threaded hole; 29. ​​Screw; 3. Fixing assembly; 31. Collar; 32. Threaded hole; 33. Rotating bar; 34. Fixing thread; 35. Fixing plug; 36. Insertion hole; 4. Blocking assembly; 41. Retaining ring; 42. Clamping groove; 43. Rotating piece; 44. Clamping hole; 45. Clamping bar; 46. Threaded cap; 47. Slot. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] Please see Figures 1 to 6 The present invention provides the following technical solutions:

[0026] Example 1: A proximal femoral antirotation intramedullary nail includes a round rod 1, a rotating component 2 for assisting rotation is provided inside the round rod 1, a fixing component 3 for fixing the rotation angle at both ends is provided at the upper end of the round rod 1, and a shielding component 4 is provided at the upper end of the fixing component 3.

[0027] The rotating assembly 2 includes a circular cavity 21 inside the circular rod 1. Both ends of the circular rod 1 are provided with rotating grooves 22. Rotating rods 23 are rotatably connected inside the rotating grooves 22. An annular groove 24 is provided on the outer wall of the rotating rods 23. A fixing ring 25 is fixedly sleeved inside the rotating grooves 22. The other ends of the two rotating rods 23 are respectively fixedly connected with a distal rotating block 26 and a proximal rotating block 27. Threaded holes 28 are provided on the surfaces of the distal rotating block 26 and the proximal rotating block 27. Screws 29 are threadedly connected inside the threaded holes 28.

[0028] The fixing component 3 includes two collars 31 that are movably fitted onto the inner wall of the circular cavity 21. A threaded hole 32 is provided at the center of the collar 31. A rotating bar 33 is inserted into the inside of the collar 31. A fixing thread 34 is provided on the surface of the rotating bar 33. Two fixing blocks 35 are symmetrically fixedly connected to the surface of the collar 31. Insertion holes 36 are provided on the inner walls at both ends of the circular cavity 21.

[0029] The retaining ring 25 is snapped into the inside of the annular groove 24. The retaining ring 25 matches the annular groove 24. The retaining ring 25 fixes the rotating rod 23 with the annular groove 22, so that the rotating rod 23 can rotate stably in the rotating groove 22.

[0030] The fixing block 35 is inserted into the insertion hole 36, which is connected to the rotating groove 22, so that the fixing block 35 can be stably inserted into the rotating groove 22 and contact the rotating rod 23.

[0031] The upper end of the rotating bar 33 extends through the proximal rotating block 27 to the outside. The two fixing threads 34 on the surface of the rotating bar 33 are arranged in opposite directions. The proximal rotating block 27 extends from the upper end of the rotating bar 33 to facilitate the fixing of the rotating bar 33.

[0032] In use, first rotate the distal rotating block 26 and the proximal rotating block 27 to a suitable angle so that the threaded hole 28 can be rotated to a suitable angle to facilitate the screw 29 being nailed to the patient's femur. By adjusting the angle of the threaded hole 28, it is easy to avoid the location of the femur with a crack. Then, rotate the rotating bar 33 to drive the fixing thread 34 to rotate. When the fixing thread 34 rotates, it squeezes the threaded hole 32 on the inner wall of the two collars 31, so that the two collars 31 are squeezed and move to both ends along the rotating bar 33. The collars 31 drive the fixing plug 35 fixed on the surface to be inserted into the insertion hole 36, so that the fixing plug 35 is inserted into the rotating groove 22 and fits against the rotating rod 23. The rotating rod 23 is fixed inside the rotating groove 22 by the fixing plug 35, so that the rotation angle of the distal rotating block 26 and the proximal rotating block 27 can be fixed. This can prevent the distal rotating block 26 and the proximal rotating block 27 from rotating inside the femur, effectively preventing the intramedullary nail from rubbing against the internal bone tissue and avoiding a series of effects caused by the friction of the internal bone tissue.

[0033] Example 2: The technical solution of this example that differs from that of Example 1 includes: the shielding component 4 includes a fixing ring 41, which is fixedly connected to the upper end of the proximal rotating block 27. The upper end of the fixing ring 41 is provided with a clamping groove 42, and a rotating piece 43 is engaged inside the clamping groove 42. A clamping hole 44 is provided inside the rotating piece 43, and a clamping strip 45 is inserted into the clamping hole 44. A threaded cap 46 is threadedly connected to the outer wall of the fixing ring 41, and a slot 47 is provided inside the threaded cap 46.

[0034] The clamp 45 is fixedly connected to the upper end of the rotating bar 33. The upper end of the clamp 45 is inserted into the slot 47, so that the clamp 45 can drive the rotating bar 33 to rotate. The clamp 45 is stored in the slot 47 to prevent the clamp 45 from causing abnormal effects inside the femur.

[0035] In use, first push the rotating piece 43 upward from the clamping groove 42, while ensuring that the clamping hole 44 is fitted onto the surface of the clamping strip 45. Then, rotate the rotating piece 43 to drive the clamping strip 45 to rotate, and the clamping strip 45 can drive the rotating strip 33 to rotate. After the rotation adjustment of the rotating strip 33 is completed, insert the rotating piece 43 into the clamping groove 42, and then thread the threaded cap 46 to the outside of the fixing ring 41, so that the rotating piece 43 and the clamping strip 45 are covered to prevent these components from having abnormal effects inside the femur.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A proximal femoral antirotation intramedullary nail, comprising a round rod (1), wherein a rotating component (2) for assisting rotation is provided inside the round rod (1), a fixing component (3) for fixing the rotation angle at both ends is provided at the upper end of the round rod (1), and a shielding component (4) is provided at the upper end of the fixing component (3). Its features are: The rotating assembly (2) includes a circular cavity (21) inside the circular rod (1). Both ends of the circular rod (1) are provided with rotating grooves (22). Two rotating rods (23) are rotatably connected inside the rotating grooves (22). The outer walls of the two rotating rods (23) are provided with annular grooves (24). A fixing ring (25) is fixedly sleeved inside the rotating grooves (22). The two rotating rods (23) are respectively fixedly connected with a distal rotating block (26) and a proximal rotating block (27). Threaded holes (28) are provided on the surfaces of the distal rotating block (26) and the proximal rotating block (27). Screws (29) are threaded inside the threaded holes (28). The fixing component (3) includes two collars (31) that are movably sleeved on the inner wall of the circular cavity (21). A screw hole (32) is provided at the center of the collar (31). A rotating bar (33) is inserted into the inside of the collar (31). A fixing thread (34) is provided on the surface of the rotating bar (33). Two fixing blocks (35) are symmetrically fixedly connected to the surface of the collar (31). Insertion holes (36) are provided on the inner walls at both ends of the circular cavity (21). The shielding assembly (4) includes a fixing ring (41), which is fixedly connected to the upper end of the proximal rotating block (27). The upper end of the fixing ring (41) is provided with a clamping groove (42), and a rotating piece (43) is engaged inside the clamping groove (42). A clamping hole (44) is provided inside the rotating piece (43), and a clamping strip (45) is inserted inside the clamping hole (44). A threaded cap (46) is threadedly connected to the outer wall of the fixing ring (41), and a slot (47) is provided inside the threaded cap (46).

2. The intramedullary nail for preventing proximal femoral rotation according to claim 1, characterized in that: The fixing ring (25) is engaged inside the ring groove (24), and the fixing ring (25) matches the ring groove (24).

3. The intramedullary nail for preventing proximal femoral rotation according to claim 1, characterized in that: The fixing block (35) is inserted into the socket (36), which is connected to the rotating groove (22).

4. The intramedullary nail for preventing proximal femoral rotation according to claim 1, characterized in that: The upper end of the rotating bar (33) extends through the proximal rotating block (27) to the outside, and the fixing threads (34) on the surface of the rotating bar (33) are divided into two sets arranged in opposite directions.

5. The intramedullary nail for preventing proximal femoral rotation according to claim 1, characterized in that: The clamp (45) is fixedly connected to the upper end of the rotating bar (33), and the upper end of the clamp (45) is inserted into the slot (47).

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