Pressure-adjustable hollow threaded nail device

Abstract

The utility model discloses a pressure-adjustable hollow threaded nail device. The pressure-adjustable hollow threaded nail device comprises a fixing rod and a sleeve connected with the fixing rod in a sleeving mode. External threads are arranged at the front end of the fixing rod, a threaded hole is formed in the rear end of the fixing rod, an open groove matched with the fixing rod is formed in the front end of the sleeve, and a threaded through hole corresponding to the threaded hole is formed in the bottom of the open groove; wherein the threaded hole is connected with the threaded through hole through a threaded needle, and a locking nut used for applying pressure to the fixing rod is arranged on the portion, located on the outer side of the threaded through hole, of the threaded needle. The threaded needle is connected with the tail portion of the fixing rod, the fixing rod is pressurized by rotating the locking nut located on the second threaded portion, so that the femoral neck connected with the fixing rod can be tightly connected with the femoral neck connected with the sleeve, and meanwhile the scale marks are arranged at the tail portion of the sleeve. Therefore, the applied pressure can be adjusted by counting the rotation angle of the locking nut, and the fixing rod is prevented from loosening due to excessive drilling pressure on the femoral neck under the condition that the holding force of the femoral neck is kept.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical devices, and particularly relates to a pressure-adjustable hollow screw device. BACKGROUND

[0002] Internal fixation is an important method that cannot be replaced in the treatment of proximal femoral fractures such as femoral neck fractures and intertrochanteric fractures. The hollow compression screw for fixing femoral neck fractures has the advantages of simple operation, less local anatomical separation, short operation time, less bleeding during operation, fewer cases and less amount of blood transfusion after operation, and small local tissue trauma, which also makes the postoperative CRP level lower.

[0003] For example, patent CN214966494U provides a femoral neck sleeve thread hollow screw. The tail part of the hollow screw that tightens the fracture line through the back pull can be fixed to the lateral cortex of the trochanter by the auxiliary fixing rod, which can also serve as a tension bearing point for reducing the fracture and a support point for the stress of the femoral neck through the fracture line, thereby enhancing the stability of the internal fixation system. However, the main fixing rod and the auxiliary fixing rod in the above-mentioned patent are connected by a compression screw, and the compression pressure cannot be visually adjusted. CONTENT OF THE UTILITY MODEL

[0004] The application provides a pressure-adjustable hollow screw device to solve the above technical problems.

[0005] To solve the above technical problems, one technical scheme adopted by the application is: a pressure-adjustable hollow screw device, comprising a fixing rod and a sleeve sleeved on the fixing rod; the front end of the fixing rod is provided with an external thread, the rear end of the fixing rod is provided with a threaded hole, and the front end of the sleeve is provided with a slotted groove matched with the fixing rod, and the bottom of the slotted groove is provided with a threaded hole corresponding to the threaded hole; wherein the threaded hole and the threaded hole are connected by a threaded needle, and the part of the threaded needle located outside the threaded hole is provided with a locking nut for applying pressure to the fixing rod.

[0006] Further, the front end of the threaded needle is provided with a first threaded part matched with the threaded hole, and the middle part of the threaded needle is provided with a second threaded part sleeved with the locking nut; wherein the outer diameter of the second threaded part is smaller than the outer diameter of the first threaded part.

[0007] Further, the length of the first threaded part is the same as the depth of the threaded hole.

[0008] Further, the inner diameters and thread directions of the threaded hole and the threaded hole are the same, and the inner diameter of the threaded hole is greater than the outer diameter of the second threaded part.

[0009] Further, one side of the sleeve away from the slotted groove is provided with a limiting ring plate abutting against the locking nut, and the outer edge of the threaded hole in the limiting ring plate is provided with a plurality of scale marks.

[0010] Further, the outer wall of the locking nut is provided with a scale bar corresponding to the scale mark.

[0011] Further, the fixed rod, the sleeve and the threaded needle are all titanium alloy.

[0012] The beneficial effects of the present application are: the present application connects the fixed rod to the tail of the threaded needle, and pressurizes the fixed rod by rotating the locking nut located at the second threaded part, so that the femoral neck connected by the fixed rod can be tightly connected with the sleeve, and since the tail of the sleeve is provided with a scale mark, the pressure applied can be adjusted by counting the rotation angle of the locking nut, thereby preventing the fixed rod from loosening the femoral neck due to excessive pressure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic diagram of an embodiment of the hollow threaded nail device of the present application;

[0014] Figure 2 is a structural schematic diagram of an embodiment of the fixed rod in Figure 1 ;

[0015] Figure 3 is a structural schematic diagram of an embodiment of the threaded needle in Figure 1 ;

[0016] Figure 4 is a structural schematic diagram of an embodiment of the sleeve in Figure 1 ; DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0018] As shown in Figures 1-4 , the pressure-adjustable hollow threaded nail device comprises a fixed rod 1 and a sleeve 2 sleeved at the tail of the fixed rod 1; the front end of the fixed rod 1 is provided with an external thread 12, the rear end of the fixed rod 1 is provided with a threaded hole 11, the front end of the sleeve 2 is provided with a slotted groove 21 matched with the fixed rod 1, and the bottom of the slotted groove 21 is provided with a threaded through hole 22 corresponding to the threaded hole 11; wherein the threaded hole 11 and the threaded through hole 22 are connected through a threaded needle 3, and the part of the threaded needle 3 located outside the threaded through hole 22 is provided with a locking nut 4 for applying pressure to the fixed rod 1. The threaded needle 3 in the above design can connect the fixed rod 1, and the locking nut 4 can be rotated to pressurize the fixed rod 1 through the threaded needle 3, thereby ensuring the tight connection of the fracture surface.

[0019] The front end of the threaded needle 3 is provided with a first threaded part 31 matched with the threaded hole 11, and the middle part of the threaded needle 3 is provided with a second threaded part 32 sleeved with the locking nut 4; wherein the outer diameter of the second threaded part 32 is smaller than that of the first threaded part 31. The first threaded part 31 in the above design is used to connect the tail end of the fixed rod 1, and the second threaded part 32 is used to sleeve the locking nut 4. The outer diameter of the part of the threaded needle 3 after the second threaded part 32 is smaller than that of the second threaded part 32. In order to facilitate the rotation of the threaded needle 3, the tail part of the threaded needle 3 can be provided in the shape of a triangular prism, a quadrangular prism, a hexagonal prism, etc.

[0020] The length of the first threaded part 31 is the same as the depth of the threaded hole 11. The above design makes the first threaded part 31 completely embedded in the threaded hole 11 at the rear end of the fixed rod 1, so that when the compression is completed, the threaded needle 3 can be reversed to make a part of the first threaded part 31 screwed into the threaded hole 22, so that the fixed rod 1 can be stably connected with the sleeve 2.

[0021] The inner diameters and the thread directions of the threaded hole 11 and the threaded hole 22 are the same, wherein the minimum inner diameter of the threaded hole 22 is greater than the outer diameter of the second threaded part 32. The above design makes the threaded needle 3 tightly connected with the threaded hole 22 when reversed. In this embodiment, the length of the threaded hole 22 is short, and the number of thread teeth is small, so that the threaded needle 3 can be stably connected with the threaded hole 22 after being reversed for two or three turns, so as to make the fixed rod 1 connected and fastened with the sleeve 2, preventing the screw from retreating. In addition, when the screw device is disassembled, the first threaded part 31 of the threaded needle 3 can be completely unscrewed from the tail part of the threaded hole 22, so as to separate the fixed rod 1 from the sleeve 2.

[0022] The side of the sleeve 2 away from the opening groove 21 is provided with a limiting ring plate 23 abutting against the locking nut 4, and the outer edge of the threaded hole 22 in the limiting ring plate 23 is provided with a plurality of scale marks. The limiting ring plate 23 in the above design can prevent the sleeve 2 from being completely drilled into the outer cortical bone, and can abut against the locking nut 4, facilitating compression. At the same time, the scale marks can represent a plurality of angles. In this embodiment, the edge of the limiting ring plate 23 is provided with six scale marks, and the angle between each scale mark is 60 degrees. In other embodiments, 12 or 24 scale marks can be provided according to actual needs.

[0023] The outer wall of the locking nut 4 is provided with a scale bar 41 corresponding to the scale marks. The scale bar 41 in the above design can correspond to the scale marks by rotating the locking nut 4, so as to facilitate the calculation of the rotation angle and the adjustment of the compression pressure. After the compression is completed, the excess threaded needle 3 at the tail part can be broken to ensure that the tail part of the screw does not protrude.

[0024] The fixed rod 1, the sleeve 2 and the threaded needle 3 are all made of titanium alloy. The titanium alloy can ensure the strength of the entire threaded nail, and has corrosion resistance, good biocompatibility and shock resistance.

[0025] In use, the front end of the fixed rod 1 is screwed into the cancellous bone on the proximal segment of the femoral neck (femoral head), and then the threaded needle 3 is screwed into the threaded hole 11 at the rear end of the fixed rod 1. Since the first threaded portion 31 has the same depth as the threaded hole 11, the first threaded portion 31 can be completely screwed into the threaded hole 11. Then the sleeve 2 is first sleeved at the rear end of the threaded needle 3, and then screwed into the cortical bone surface of the femur and sleeved with the tail of the fixed rod 1. At this time, the second threaded portion 32 of the threaded needle 3 is partially located in the threaded through hole 22 of the sleeve 2 and partially located outside the threaded through hole 22. Then the locking nut 4 is screwed into the second threaded portion 32 to make the locking nut 4 abut against the limiting ring plate 23. The scale bar 41 of the locking nut 4 is aligned with one of the scale marks. The locking nut 4 is tightened by a special wrench, thereby pressing the fixed rod 1. Each time the scale bar 41 turns one scale mark, it represents that one standard pressure value is added. The specific pressure value can be adjusted and preset according to the type of the fracture and the displacement of the fracture end. Finally, the femoral head and the femoral shaft are integrated and fixed, reducing the occurrence of femoral head rotation instability.

[0026] When the pressure is completed, the threaded through hole 22 is connected with the threaded hole 11. At this time, the threaded needle 3 is reversed, the tail of the first threaded portion 31 is just screwed out of the threaded hole 11 and enters the threaded through hole 22, so that the threaded through hole 22 and the threaded hole 11 are connected through the first threaded portion 31, thereby completing the fixation of the fixed rod 1 and the sleeve 2, preventing the threaded nail from being removed. Finally, the excess part of the threaded nail is broken to prevent the tail of the threaded nail from being too long.

[0027] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A pressure adjustable cannulated threaded pin device, characterized by, The utility model relates to a fixing rod and sleeve set, comprising: A fixing rod and a sleeve set with the fixing rod; the front end of the fixing rod is provided with external thread, the rear end of the fixing rod is provided with a threaded hole, the front end of the sleeve is provided with a slot matched with the fixing rod, the bottom of the slot is provided with a threaded through hole corresponding to the threaded hole; wherein the threaded hole and the threaded through hole are connected through a threaded needle, the part of the threaded needle located outside the threaded through hole is provided with a locking nut for applying pressure to the fixing rod.

2. A pressure adjustable cannulated screw device according to claim 1, wherein, The front end of the threaded needle is provided with a first threaded part matched with the threaded hole, and the middle part of the threaded needle is provided with a second threaded part sleeved with the locking nut; wherein the outer diameter of the second threaded part is smaller than the outer diameter of the first threaded part.

3. A pressure adjustable cannulated screw device according to claim 2, wherein, The length of the first threaded part is the same as the depth of the threaded hole.

4. A pressure adjustable cannulated screw device according to claim 3, wherein, The inner diameter and the thread direction of the threaded hole and the threaded through hole are the same, wherein the inner diameter of the threaded through hole is larger than the outer diameter of the second threaded part.

5. A pressure adjustable cannulated screw device according to claim 2, wherein, The outer wall of the sleeve is provided with a thread, and the side of the sleeve away from the slot is provided with a limiting ring plate abutting against the locking nut, and the outer edge of the threaded through hole in the limiting ring plate is provided with a plurality of scale marks.

6. A pressure adjustable cannulated screw device according to claim 5, wherein, The outer side wall of the locking nut is provided with a scale bar, and the scale bar corresponds to the scale mark.

7. The adjustable compression cannulated screw device of claim 1, wherein, The fixing rod, the sleeve and the threaded needle are all titanium alloy.

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