Thighbone implantation head structure

Abstract

The utility model discloses a thighbone implantation head structure. The device comprises a barrel and a guide rod, a first guide block is installed in the barrel and rotationally connected with the barrel, one end of the first guide block directly faces the bottom face of the barrel, a screw is fixed to the first guide block, a barrel through hole matched with the screw is formed in the bottom face of the barrel, the other end of the first guide block directly faces an opening of the barrel, and a second guide block is further installed in the barrel and rotationally connected with the second guide block. A threaded through hole matched with the screw is formed in the second guide block, the screw is arranged in the threaded through hole and is in threaded connection with the threaded through hole, a guide rod groove matched with one end of the guide rod is formed in the end face of the other end of the first guide block, and one end of the guide rod is detachably connected with the guide rod groove. The utility model has the beneficial effects of simplicity in operation and convenience in use.

Description

Technical Field

[0001] The utility model relates to the technical field related to medical devices, in particular to a femoral implant head structure. Background Art

[0002] The knee is one of the largest joints in the human body. The cruciate ligament provides the most important stabilizing force for the knee joint, prevents the femur from sliding forward, and limits the rotation function of the tibia. However, it is also one of the most commonly injured ligaments. Cruciate ligament injuries are usually caused by sudden external forces applied to the knee due to sports injuries, car accidents, falls, etc., or aging and relaxation with age, which causes the cruciate ligament to rupture or lose function, causing patients to have knee weakness or muscle imbalance, and thus being restricted from exercising like normal people. Even worse, it seriously affects daily activities.

[0003] For this purpose, cruciate ligament reconstruction surgery has been developed. Currently, the most common method of this surgery is to first position the patient's knee at a semi-bent angle, use a drilling instrument to drill and penetrate the femur and tibia at the same time, forming a perforation with a diameter of about 6 mm, and then embed the ligament or implant into the 6 mm diameter perforation. Various implants are used to fix the two ends of the ligament or implant in the femur and tibia to replace the damaged cruciate ligament, so that the patient can use post-operative reconstruction to allow the bones and ligaments or implants to gradually heal and restore the original function of the knee. As shown in the "Interference Screw" of U.S. Patent Publication No. 6,589,245, compared with the above-mentioned endo-button implant, it does not leave too much empty space in the bone, the surgical wound is small, and the patient will not feel a foreign body sensation after the operation. In addition, the interference screw uses an internal fixation method to more accurately tighten and position the ligament or implant. However, the disadvantage is that the surgical process of positioning and fixing the interference screw is complicated and cumbersome, and the operation is difficult, and it is difficult to ensure that the ligament or implant can be stably fixed on the bone.

[0004] In summary, there is a need for a femoral implant head structure that is simple to operate and easy to use. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art in which the positioning and fixation of the intermediate surface screws are complicated and cumbersome, the operation is difficult, and it is difficult to ensure that the ligament or implant can be stably fixed on the bone, and provides a femoral implant head structure that is simple to operate and easy to use.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A femoral implant head structure comprises a cylinder body and a guide rod, a guide block 1 is installed inside the cylinder body, the guide block 1 is rotatably connected to the cylinder body, one end of the guide block 1 faces the bottom surface of the cylinder body and is fixed with a screw, the bottom surface of the cylinder body is provided with a cylinder through hole matching the screw, the other end of the guide block 1 faces the opening of the cylinder body, a guide block 2 is also installed inside the cylinder body, a threaded through hole matching the screw is provided on the guide block 2, the screw is placed in the threaded through hole and threadedly connected with the screw, a guide rod groove matching one end of the guide rod is provided on the end surface of the other end of the guide block 1, a limit slot is provided on the side wall of the guide rod groove, and a screw is provided on the end surface of the other end of the guide rod The cam is provided with a plurality of guide wheels, each of which is adapted to move along the axis of the rod, and the guide wheels are adapted to move along the axis of the rod to move along the axis of the rod.

[0008] In the natural state, the operating screw and the limiting clamping column are in a mutually separated state. During installation, one end of the guide rod is inserted into the bottom of the guide rod groove, at which time the limiting clamping groove and the clamping column through hole are aligned and matched with each other, and then the operating screw is rotated to make it move in the direction of the limiting clamping column, and under the guiding action of the guiding inclined surface and the annular inclined guide surface, the limiting clamping column in the clamping column through hole is driven to move in the direction of the limiting clamping groove, so that one end of the limiting clamping column is clamped into the limiting clamping groove, thereby completing the assembly and fixation between the guide block 1 and the guide rod, which is simple to operate and convenient to assemble. During surgery, the utility model is extended into and pressed against the bottom of the femoral tunnel, and then the guide rod is rotated to drive the guide block 1 and the screw to rotate (at this time, the cylinder is pressed against the bottom surface of the femoral tunnel and does not rotate, and the guide block 2 connected to the cylinder does not rotate either), and under the transmission action of the threaded through hole on the guide block 2, the screw is screwed into the bottom surface of the femoral tunnel, so that the entire femoral implant head is fixed at the bottom of the femoral tunnel, which is simple to operate, convenient to use, and has a good fixing effect. When the guide rod is withdrawn, it is only necessary to rotate the operating screw on the guide rod to separate the operating screw and the limit clamping column again. At this time, the limit clamping column will leave the limit clamping groove and retract into the clamping column through hole under the action of the reset elastic force of the reset spring 1, thereby automatically releasing the fixing effect between the guide block 1 and the guide rod, so that the guide rod can be withdrawn smoothly. The operation is simple and easy to use.

[0009] Preferably, the cylinder is composed of two shell petals of the same shape and size, the two shell petals are respectively placed on the left and right sides of guide block one, and a shell petal fixing rod and a shell petal transmission rod are provided on the inner wall of the shell petal, one end of the shell petal fixing rod is fixedly connected to the shell petal, and the other end of the shell petal fixing rod is installed on the outer wall of guide block two and is hinged thereto, a circular ring is sleeved on the guide block one, the circular ring is rotatably connected to the guide block one, one end of the shell petal transmission rod is installed on the inner wall of the shell petal and is hinged thereto, and the other end of the shell petal transmission rod is installed on the outer wall of the circular ring and is hinged thereto, and two support plates are provided at the opening of the cylinder, the two support plates are respectively placed on the front and rear sides of guide block one and are both connected to guide block one, shell petal supporting inclined surfaces are provided on the sides of both sides of the support plates, and ligament through holes are provided on the plate surface of the support plates. During the operation, one end of the transplanted ligament is first passed through the two ligament through holes in sequence, then the two ends of the transplanted ligament are pinched and the transplanted ligament is folded in half, and then the utility model with the transplanted ligament is inserted into the femoral tunnel and pressed against the bottom of the femoral tunnel. When the guide block and the screw are pushed forward, the two shell flaps are driven to expand rapidly to the left and right sides at the same time through the transmission cooperation of the shell flap fixing rod and the shell flap transmission rod, so that the opening edge of the cylinder is pressed against the side wall of the femoral tunnel, thereby realizing the radial positioning of the femoral implant head in the femoral tunnel, avoiding the displacement of the femoral implant head in the femoral tunnel, and improving the connection stability.

[0010] Preferably, a guide block fixing rod matching the support plate is provided on the side wall of the guide block 2, one end of the guide block fixing rod is fixedly connected to the guide block 2, one end of the support plate is placed on the inner side of the cylinder and is hinged to the other end of the guide block fixing rod, a support plate transmission rod is also provided on the support plate, one end of the support plate transmission rod is installed on the plate surface of the support plate and is hinged thereto, the other end of the support plate transmission rod is installed on the outer wall of the ring and is hinged thereto, an outer side of the guide rod is sleeved with an outer tube, the guide rod and the outer tube are slidably connected, the other end of the support plate is placed on the outer side of the cylinder and is clamped to the end of the outer tube. The other end of the support plate is clamped to the end of the outer tube for fixing, and the opening edge of the cylinder (shell flap) is supported and fixed by the shell flap support inclined surface on the support plate, thereby ensuring the structural stability of the femoral implant head. When the guide block and the screw are pushed forward, the two support plates are driven to quickly expand forward and backward at the same time through the transmission cooperation of the guide block fixing rod and the support plate transmission rod (at this time, the other end of the support plate is automatically separated from the end of the outer tube), so that the other end of the support plate presses the transplanted ligament against the inner wall of the femoral tunnel, which increases the contact area between the transplanted ligament and the femur on the one hand, and further improves the connection stability of the femoral implant head in the femoral tunnel on the other hand.

[0011] Preferably, a clamping block is fixed on the end surface of the outer tube, the clamping block is placed on the side of the guide rod, and the other end of the support plate is provided with a clamping slot matching the clamping block. Through the clamping fit between the clamping block and the clamping slot, the other end of the support plate is conveniently mounted on the end surface of the outer tube, and when the support plate is unfolded, the clamping block and the clamping slot are automatically separated to ensure that the support plate can be unfolded smoothly.

[0012] Preferably, a push block matching the support plate is mounted on the end surface of the outer tube, the push block and the outer tube are slidably connected, one end of the push block is in contact with the support plate, and a cam portion matching the push block is fixed on the outer wall of the guide rod, and the other end of the push block is in contact with the cam portion. In a natural state, the push block is in contact with the root of the cam portion. When the guide rod drives the support plate to unfold by rotating and pushing, the cam portion thereon is also rotating synchronously, and will also push the push block to move in the direction of the support plate, thereby pushing the support plate in contact with it to unfold outward, thereby improving the unfolding efficiency of the support plate.

[0013] Preferably, a spring slot is provided at one end of the push block, the spring slot is directly opposite to the clamping block, a second return spring is provided in the spring slot, one end of the second return spring is connected to the clamping block, and the other end of the second return spring is connected to the bottom surface of the spring slot. The second return spring plays the role of automatic reset of the push block.

[0014] The beneficial effects of the utility model are: simple operation, convenient assembly and disassembly; convenient use; improved connection stability; and improved deployment efficiency of the support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0017] Figure 3 yes Figure 2 Enlarged view of point C in the middle;

[0018] Figure 4 yes Figure 2 The enlarged view of point D in the middle;

[0019] Figure 5 yes Figure 1 Sectional view at the middle BB;

[0020] Figure 6 yes Figure 1 A partial cross-sectional view of .

[0021] In the figure: 1. shell flap, 2. guide rod, 3. guide block 1, 4. screw, 5. cylinder through hole, 6. guide block 2, 7. threaded through hole, 8. guide rod slot, 9. limit slot, 10. screw slot, 11. clamping column through hole, 12. limit clamping column, 13. operating screw, 14. reset spring 1, 15. shell flap fixing rod, 16. shell flap transmission rod, 17. ring, 18. support plate, 19. shell flap support inclined surface, 20. ligament through hole, 21. guide block fixing rod, 22. support plate transmission rod, 23. outer tube, 24. clamping block, 25. clamping slot, 26. push block, 27. cam part, 28. spring slot, 29. reset spring 2. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1-6 In the described embodiment, a femoral implant head structure includes a cylinder and a guide rod 2, a guide block 3 is installed inside the cylinder, the guide block 3 is rotatably connected to the cylinder, one end of the guide block 3 is facing the bottom surface of the cylinder and a screw 4 is fixed thereon, the bottom surface of the cylinder is provided with a cylinder through hole 5 matching the screw 4, the other end of the guide block 3 is facing the opening of the cylinder, a guide block 2 6 is also installed inside the cylinder, the guide block 2 6 is provided with a threaded through hole 7 matching the screw 4, the screw 4 is placed in the threaded through hole 7 and is threadedly connected thereto, a guide rod groove 8 matching one end of the guide rod 2 is provided on the end surface of the other end of the guide block 3, a limit groove 9 is provided on the side wall of the guide rod groove 8, a screw groove 10 is provided on the end surface of the other end of the guide rod 2, and the screw groove A post through hole 11 corresponding to the limit slot 9 is provided on the side wall of 10, and a limit post 12 is slidably connected in the post through hole 11, one end of the limit post 12 matches the limit slot 9, and the other end of the limit post 12 is placed in the screw groove 10 and is provided with a guide bevel, which is inclined toward the post through hole 11 from the side close to the bottom of the screw groove 10 to the side close to the opening of the screw groove 10. An operating screw 13 is threadedly connected to the screw groove 10, and one end of the operating screw 13 is provided with an annular inclined guide surface matching the guide bevel, and the other end of the operating screw 13 is located outside the screw groove 10, and the other end of the limit post 12 is connected to the side wall of the screw groove 10 through a reset spring 14.

[0024] The cylinder body is composed of two shell petals 1 of the same shape and size, and the two shell petals 1 are respectively placed on the left and right sides of the guide block 3. A shell petal fixing rod 15 and a shell petal transmission rod 16 are provided on the inner wall of the shell petal 1, one end of the shell petal fixing rod 15 is fixedly connected to the shell petal 1, and the other end of the shell petal fixing rod 15 is installed on the outer wall of the guide block 6 and is hinged thereto. A circular ring 17 is sleeved on the guide block 3, and the circular ring 17 is rotatably connected to the guide block 3. One end of the shell petal transmission rod 16 is installed on the inner wall of the shell petal 1 and is hinged thereto, and the other end of the shell petal transmission rod 16 is installed on the outer wall of the circular ring 17 and is hinged thereto. Two support plates 18 are provided at the opening of the cylinder body, and the two support plates 18 are respectively placed on the front and rear sides of the guide block 3 and are both connected to the guide block 3. Shell petal supporting inclined surfaces 19 are provided on the sides of the support plates 18, and ligament through holes 20 are provided on the surface of the support plates 18.

[0025] A guide block fixing rod 21 matching the support plate 18 is provided on the side wall of the guide block 2 6, one end of the guide block fixing rod 21 is fixedly connected to the guide block 2 6, one end of the support plate 18 is placed on the inner side of the cylinder and is hinged to the other end of the guide block fixing rod 21, and a support plate transmission rod 22 is also provided on the support plate 18, one end of the support plate transmission rod 22 is installed on the plate surface of the support plate 18 and is hinged thereto, and the other end of the support plate transmission rod 22 is installed on the outer wall of the ring 17 and is hinged thereto, an outer side of the guide rod 2 is sleeved with an outer tube 23, the guide rod 2 and the outer tube 23 are slidably connected, and the other end of the support plate 18 is placed on the outer side of the cylinder and is clamped with the end of the outer tube 23.

[0026] A clamping block 24 is fixed on the end surface of the outer tube 23 , and the clamping block 24 is placed on the side of the guide rod 2 . A clamping groove 25 matching the clamping block 24 is provided at the other end of the support plate 18 .

[0027] A push block 26 matching the support plate 18 is installed on the end surface of the outer tube 23, the push block 26 and the outer tube 23 are slidably connected, one end of the push block 26 contacts the support plate 18, and a cam portion 27 matching the push block 26 is fixed on the outer side wall of the guide rod 2, and the other end of the push block 26 contacts the cam portion 27.

[0028] A spring groove 28 is provided at one end of the push block 26 , and the spring groove 28 faces the clamping block 24 . A return spring 29 is provided in the spring groove 28 , and one end of the return spring 29 is connected to the clamping block 24 , and the other end of the return spring 29 is connected to the bottom surface of the spring groove 28 .

[0029] When installing the guide block 3 and the guide rod 2, one end of the guide rod 2 is inserted into the bottom of the guide rod groove 8. At this time, the limit slot 9 and the column through hole 11 are aligned and matched with each other. Then, the operating screw 13 is rotated to make it move toward the direction of the limit column 12, and under the guidance of the guiding inclined surface and the annular inclined guide surface, the limit column 12 in the column through hole 11 is driven to move toward the direction of the limit slot 9, so that one end of the limit column 12 is inserted into the limit slot 9, and the assembly and fixation of the guide block 3 and the guide rod 2 are completed.

[0030] During the operation, one end of the transplanted ligament is first passed through the two ligament through holes 20 in sequence, then the two ends of the transplanted ligament are pinched and the transplanted ligament is folded in half, and then the utility model with the transplanted ligament is extended into the femoral tunnel and pressed against the bottom of the femoral tunnel, and then the guide rod 2 is rotated to drive the guide block 3 and the screw 4 to rotate (at this time, the cylinder is pressed against the bottom surface of the femoral tunnel and does not rotate, and the guide block 2 6 connected to the cylinder does not rotate either). Under the transmission action of the threaded through hole 7 on the guide block 2 6, the screw 4 is screwed into the bottom surface of the femoral tunnel, so that the entire femoral implant head is fixed to the bottom of the femoral tunnel. When the guide block 3 and the screw 4 are pushed forward, on the one hand, the two shell petals 1 are driven to quickly expand to the left and right sides at the same time through the transmission cooperation of the shell petal fixing rod 15 and the shell petal transmission rod 16, so that the opening edge of the cylinder is pressed against the side wall of the femoral tunnel, thereby realizing the radial positioning of the femoral implant head in the femoral tunnel. On the other hand, the two support plates 18 are driven to quickly expand to the front and rear sides at the same time through the transmission cooperation of the guide block fixing rod 21 and the support plate transmission rod 22 (when the guide rod 2 drives the support plate 18 to expand by rotating and advancing, the cam portion 27 thereon is also rotating synchronously, and it also pushes the push block 26 to move in the direction of the support plate 18, so that the other end of the support plate 18 is automatically separated from the end of the outer tube 23 and quickly expanded outward), so that the other end of the support plate 18 presses the transplanted ligament against the inner wall of the femoral tunnel.

[0031] When the guide rod 2 and the outer tube 23 are to be withdrawn, it is only necessary to rotate the operating screw 13 on the guide rod 2 to separate the operating screw 13 and the limit clamping column 12 again. At this time, the limit clamping column 12 will leave the limit clamping groove 9 and retract into the clamping column through hole 11 under the action of the reset elastic force of the reset spring 14, thereby automatically releasing the fixing effect between the guide block 3 and the guide rod 2, so that the guide rod 2 and the outer tube 23 can be smoothly withdrawn.

Claims

1. A femoral implant head structure, characterized in that: The invention comprises a cylinder and a guide rod (2), wherein a guide block (3) is installed inside the cylinder, wherein the guide block (3) is rotatably connected to the cylinder, wherein one end of the guide block (3) faces the bottom surface of the cylinder and a screw (4) is fixed thereon, wherein the bottom surface of the cylinder is provided with a cylinder through hole (5) matching the screw (4), wherein the other end of the guide block (3) faces the opening of the cylinder, wherein a guide block (6) is also installed inside the cylinder, wherein a threaded through hole (7) matching the screw (4) is provided on the guide block (6), wherein the screw (4) is placed in the threaded through hole (7) and is threadedly connected thereto, wherein a guide rod groove (8) matching one end of the guide rod (2) is provided on the end surface of the other end of the guide block (3), wherein a limit groove (9) is provided on the side wall of the guide rod groove (8), wherein a screw groove (10) is provided on the end surface of the other end of the guide rod (2), wherein the screw groove (10) A post through hole (11) corresponding to the limit slot (9) is provided on the side wall thereof, a limit post (12) is slidably connected in the post through hole (11), one end of the limit post (12) matches the limit slot (9), the other end of the limit post (12) is placed in the screw groove (10) and is provided with a guide inclined surface, the guide inclined surface is inclined from a side close to the bottom of the screw groove (10) to a side close to the opening of the screw groove (10) towards the post through hole (11), an operating screw (13) is threadedly connected in the screw groove (10), one end of the operating screw (13) is provided with an annular inclined guide surface matching the guide inclined surface, the other end of the operating screw (13) is located outside the screw groove (10), and the other end of the limit post (12) is connected to the side wall of the screw groove (10) via a return spring 1 (14).

2. A femoral implant head structure according to claim 1, characterized in that: The cylinder body is composed of two shell petals (1) of the same shape and size. The two shell petals (1) are respectively placed on the left and right sides of the guide block one (3). A shell petal fixing rod (15) and a shell petal transmission rod (16) are provided on the inner wall of the shell petal (1). One end of the shell petal fixing rod (15) is fixedly connected to the shell petal (1), and the other end of the shell petal fixing rod (15) is installed on the outer wall of the guide block two (6) and is hinged thereto. A circular ring (17) is sleeved on the guide block one (3), and the circular ring (17) is rotatably connected to the guide block one (3). One end of the shell petal transmission rod (16) is mounted on the inner wall of the shell petal (1) and is hinged thereto, and the other end of the shell petal transmission rod (16) is mounted on the outer wall of the circular ring (17) and is hinged thereto. Two support plates (18) are provided at the opening of the cylinder body. The two support plates (18) are respectively placed on the front and rear sides of the guide block (3) and are both connected to the guide block (3). Shell petal support inclined surfaces (19) are provided on the side edges of both sides of the support plates (18), and ligament through holes (20) are provided on the plate surfaces of the support plates (18).

3. A femoral implant head structure according to claim 2, characterized in that: A guide block fixing rod (21) matching the support plate (18) is provided on the side wall of the guide block 2 (6), one end of the guide block fixing rod (21) is fixedly connected to the guide block 2 (6), one end of the support plate (18) is placed on the inner side of the cylinder and is hinged to the other end of the guide block fixing rod (21), the support plate (18) is also provided with a support plate transmission rod (22), one end of the support plate transmission rod (22) is mounted on the plate surface of the support plate (18) and is hinged thereto, the other end of the support plate transmission rod (22) is mounted on the outer wall of the ring (17) and is hinged thereto, the outer side of the guide rod (2) is sleeved with an outer tube (23), the guide rod (2) and the outer tube (23) are slidably connected, and the other end of the support plate (18) is placed on the outer side of the cylinder and is clamped to the end of the outer tube (23).

4. A femoral implant head structure according to claim 3, characterized in that: A clamping block (24) is fixed on the end surface of the outer tube (23), the clamping block (24) is placed on the side of the guide rod (2), and a clamping groove (25) matching the clamping block (24) is provided at the other end of the support plate (18).

5. A femoral implant head structure according to claim 4, characterized in that: A push block (26) matching the support plate (18) is mounted on the end surface of the outer tube (23); the push block (26) and the outer tube (23) are slidably connected; one end of the push block (26) is in contact with the support plate (18); a cam portion (27) matching the push block (26) is fixed on the outer side wall of the guide rod (2); the other end of the push block (26) is in contact with the cam portion (27).

6. A femoral implant head structure according to claim 5, characterized in that: A spring groove (28) is provided at one end of the push block (26), the spring groove (28) being directly opposite to the clamping block (24), a second return spring (29) being provided in the spring groove (28), one end of the second return spring (29) being connected to the clamping block (24), and the other end of the second return spring (29) being connected to the bottom surface of the spring groove (28).

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