Screw assembly and acetabular cup prosthesis assembly

Abstract

The application provides a screw assembly and an acetabular cup prosthesis assembly, and the screw assembly comprises a screw, an injection channel is arranged in the screw body, and a through hole is arranged on the side wall of the screw body; a plug hole which is communicated with the injection channel is arranged on the screw head, a guide groove, a ring groove and a clamping groove are arranged on the hole wall of the plug hole; the guide groove extends along the axis direction of the screw body, and the first end of the guide groove penetrates the surface of the screw head; the ring groove is arranged in communication with the second end of the guide groove, the clamping groove is arranged in communication with the ring groove, and the guide groove and the clamping groove are arranged in a staggered manner along the circumferential direction of the ring groove; a delivery tube, the first end of the delivery tube can be inserted and matched with the plug hole, a clamping protrusion is arranged on the outer side wall of the first end of the delivery tube, the clamping protrusion can be guided and matched with the guide groove and the ring groove, and the clamping protrusion can be clamped and matched with the clamping groove. The technical scheme of the application solves the problem that the connection between the bone screw and the autologous bone in the related art is unreliable and easily leads to prosthesis loosening.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a screw assembly and an acetabular cup prosthesis assembly. Background Technology

[0002] In the field of medical devices, the long-term stability of implanted prostheses depends on reliable fixation between the prosthesis and the autologous bone. To enhance the initial stability and anti-rotation capabilities of the prosthesis, bone screws are commonly used as auxiliary fixation devices to connect the prosthesis and the autologous bone.

[0003] However, for patients with osteoporosis, the elderly, those who have previously undergone hip surgery, or those with significant bone loss due to tumors or metabolic diseases, their low bone density, high porosity, and degenerated trabecular bone structure result in insufficient occlusion between the threads of the bone screws and the autologous bone tissue. This easily leads to problems such as loosening or pull-out of the bone screws, which in turn can cause prosthesis loosening, overall prosthesis displacement, and loss of function.

[0004] Thus, the connection between the bone screw and the autologous bone in this technology is unreliable, which can easily lead to prosthesis loosening. Summary of the Invention

[0005] The main objective of this invention is to provide a screw assembly and an acetabular cup prosthesis assembly to solve the problem in related technologies where the connection between bone screws and autologous bone is unreliable and easily leads to prosthesis loosening.

[0006] To achieve the above objectives, according to one aspect of the present invention, a screw assembly is provided, comprising: a screw, including a screw body and a screw head connected to the screw body; an injection channel is provided in the screw body, and a through hole communicating with the injection channel is provided on the side wall of the screw body; an insertion hole communicating with the injection channel is provided on the screw head, and a guide groove, an annular groove, and a snap-fit ​​groove are provided on the wall of the insertion hole; the guide groove extends along the axial direction of the screw body, and a first end of the guide groove penetrates the surface of the screw head; the annular groove is connected to the second end of the guide groove, and the snap-fit ​​groove is connected to the annular groove, and the guide groove and the snap-fit ​​groove are circumferentially offset along the annular groove; a delivery pipe, a first end of the delivery pipe being able to be inserted into the insertion hole, and a snap-fit ​​protrusion is provided on the outer side wall of the first end of the delivery pipe, the snap-fit ​​protrusion being able to guide and cooperate with the guide groove and the annular groove, and the snap-fit ​​protrusion being able to enter into the snap-fit ​​groove through the guide groove and the annular groove and engage with the snap-fit ​​groove.

[0007] Furthermore, the snap-fit ​​groove is located on the side of the annular groove opposite to the screw body.

[0008] Furthermore, a first mark is provided on the side wall of the conveying pipe, which is used to locate the snap-fit ​​protrusion; a second mark is provided on the screw head, which is used to locate the guide groove; and / or, a third mark is provided on the screw head, which is used to locate the snap-fit ​​groove.

[0009] Furthermore, there are multiple through holes, which are spaced apart along the axial direction of the screw body, and the diameter of the multiple through holes gradually increases in the direction away from the screw head.

[0010] According to another aspect of the present invention, an acetabular cup prosthesis assembly is provided, including a screw assembly and an acetabular cup, wherein the screw assembly is the screw assembly described above.

[0011] Furthermore, the screw assembly also includes a connecting rod disposed at the first end of the delivery tube, the end of the connecting rod being provided with a locking ball, the diameter of the locking ball being larger than the diameter of the connecting rod; the acetabular cup includes an outer acetabular cup and an inner acetabular cup disposed within the outer acetabular cup, the outer acetabular cup being provided with a slot for receiving the locking ball, the slot penetrating the inner surface of the outer acetabular cup and forming a socket and a locking port communicating with the socket, the diameter of the socket being larger than or equal to the diameter of the locking ball, the width of the locking port being smaller than the diameter of the locking ball and larger than or equal to the diameter of the connecting rod, and the locking ball being movably disposed within the slot.

[0012] Furthermore, the locking port is a strip-shaped opening, and the strip-shaped opening has a stop surface that is opposite to the insertion port along its extension direction. The delivery pipe rotates so that the locking ball can move from the insertion port to the locking port within the slot. When the locking ball is located at the insertion port, the locking protrusion is located in the guide groove. When the locking ball is located at the locking port and contacts the stop surface, the locking protrusion is correspondingly set with the locking groove.

[0013] Furthermore, an installation protrusion is fixedly provided on the side wall of the conveying pipe, and the screw assembly also includes a screw rod fixedly provided on the installation protrusion and a nut sleeved on the screw rod, with the nut and screw rod threaded together; a through hole is provided on the connecting rod, and the screw rod passes through the through hole; when the nut moves on the screw rod, the nut can rotate relative to the connecting rod, and the nut can adjust the position of the connecting rod on the screw rod.

[0014] Furthermore, the screw assembly also includes a spring, which is sleeved on the outside of the screw, with a first end of the spring abutting against a mounting protrusion and a second end of the spring abutting against a connecting rod; the connecting rod is located between the spring and the nut.

[0015] Furthermore, the acetabular cup includes an external acetabular cup and an internal acetabular cup disposed within the external acetabular cup. One of the external acetabular cup and the internal acetabular cup is provided with a retaining flap, and the other of the external acetabular cup and the internal acetabular cup is provided with a retaining head. The retaining flaps are multiple flaps spaced apart circumferentially, and the multiple retaining flaps form a retaining hole. The retaining head can be inserted into the retaining hole and engage with the retaining flaps.

[0016] According to the technical solution of this invention, the screw assembly includes a screw and a delivery tube. The screw includes a screw body and a screw head connected to the screw body. An injection channel is provided within the screw body, and a through hole communicating with the injection channel is provided on the side wall of the screw body. An insertion hole communicating with the injection channel is provided on the screw head, and a guide groove, an annular groove, and a snap-fit ​​groove are provided on the wall of the insertion hole. The guide groove extends along the axial direction of the screw body, and its first end penetrates the surface of the screw head. The annular groove communicates with the second end of the guide groove, and the snap-fit ​​groove communicates with the annular groove, with the guide groove and the snap-fit ​​groove being circumferentially offset along the annular groove. The first end of the delivery tube can be inserted into the insertion hole, and a snap-fit ​​protrusion is provided on the outer side wall of the first end of the delivery tube. The snap-fit ​​protrusion can guide and cooperate with the guide groove and the annular groove, and can enter the snap-fit ​​groove through the guide groove and the annular groove to engage with the snap-fit ​​groove.

[0017] In this way, the first end of the delivery tube is inserted into the socket on the screw head, and bone cement is injected into the injection channel through the delivery tube. The injection channel delivers the bone cement through the through hole to the outside of the screw body, thereby allowing the bone cement to be delivered into the autologous bone at the screw location. The bone cement at the screw location can flow into the autologous bone with low bone density and high porosity, filling the gaps in the autologous bone and connecting the autologous bone and the screw body, thereby improving the reliability of the connection between the screw and the autologous bone and reducing the risk of prosthesis loosening. Furthermore, through the setting of guide groove, annular groove, and locking groove, during the process of the first end of the delivery tube being inserted into the socket on the screw head, the delivery tube can drive the locking protrusion to move along the axis of the screw body in the guide groove. When the locking protrusion moves into the annular groove, rotating the delivery tube can drive the locking protrusion to move circumferentially in the annular groove. When the delivery tube rotates by a preset angle, the locking protrusion can move to the locking groove, and by moving the delivery tube along the axis of the screw body, the locking protrusion and the locking groove are locked together. When the first end of the delivery tube separates from the screw head, the above steps are repeated in reverse. This design enables rapid connection and separation between the delivery tube and the screw head, while also reducing the possibility of the screw head detaching from the delivery tube. This makes the connection between the delivery tube and the screw more reliable and facilitates the injection of bone cement. Therefore, the technical solution of this application effectively solves the problem of unreliable connection between the bone screw and autologous bone in related technologies, which easily leads to prosthesis loosening. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A three-dimensional structural schematic diagram of a screw according to an embodiment of a screw assembly based on the present invention is shown;

[0020] Figure 2 It shows Figure 1 A partial three-dimensional structural diagram of the screw in the screw assembly;

[0021] Figure 3 It shows Figure 1 A partial cross-sectional view of the screws in the screw assembly;

[0022] Figure 4 It shows Figure 1 A partial side view of the delivery tube of the screw assembly;

[0023] Figure 5 It shows Figure 1 A three-dimensional structural diagram of the screw assembly, injection tube, and extruder;

[0024] Figure 6 A cross-sectional schematic diagram of an embodiment of the acetabular cup prosthesis assembly according to the present invention (without a delivery tube) is shown;

[0025] Figure 7 It shows Figure 6 A partial sectional view of the acetabular cup prosthesis assembly;

[0026] Figure 8 It shows Figure 6 A planar unfolded schematic diagram of the insertion port and locking port on the external acetabular cup of the acetabular cup prosthesis assembly;

[0027] Figure 9 It shows Figure 6 A partial schematic diagram of the mounting protrusion of the acetabular cup prosthesis assembly;

[0028] Figure 10 It shows Figure 6 A cross-sectional schematic diagram of the external and internal acetabular cups of the acetabular cup prosthesis assembly;

[0029] Figure 11 It shows Figure 6 A cross-sectional view of the acetabular cup prosthesis assembly when the locking head and locking flap are engaged.

[0030] The above figures include the following reference numerals:

[0031] 11. Screw body; 111. Injection channel; 112. Through hole; 12. Screw head; 121. Insertion hole; 122. Guide groove; 123. Ring groove; 124. Snap-fit ​​groove; 125. Second mark; 126. Third mark;

[0032] 20. Conveying pipe; 21. Snap-fit ​​protrusion; 22. First marking;

[0033] 31. Connecting rod; 32. Locking ball;

[0034] 41. Mounting protrusion; 42. Screw; 43. Nut; 44. Spring;

[0035] 50. Acral cup; 51. Insertion port; 52. Locking port; 521. Stop surface; 53. Mounting hole;

[0036] 60. Acetabular cup;

[0037] 71. Card flap; 711. Wedge block; 72. Card head; 721. Annular boss;

[0038] 81. Injection tube; 82. Squeegee. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] like Figures 1 to 5As shown, the screw assembly includes a screw and a delivery tube 20. The screw includes a screw body 11 and a screw head 12 connected to the screw body 11. An injection channel 111 is provided inside the screw body 11, and a through hole 112 communicating with the injection channel 111 is provided on the side wall of the screw body 11. An insertion hole 121 communicating with the injection channel 111 is provided on the screw head 121, and a guide groove 122, an annular groove 123, and a snap-fit ​​groove 124 are provided on the wall of the insertion hole 121. The guide groove 122 extends along the axial direction of the screw body 11, and its first end penetrates the surface of the screw head 12. The annular groove 123 communicates with the second end of the guide groove 122, and the snap-fit ​​groove 124 communicates with the annular groove 123, with the guide groove 122 and the snap-fit ​​groove 124 being circumferentially offset along the annular groove 123. The first end of the conveying pipe 20 can be inserted into the socket 121, and a snap-fit ​​protrusion 21 is provided on the outer side wall of the first end of the conveying pipe 20. The snap-fit ​​protrusion 21 can be guided and engaged with the guide groove 122 and the annular groove 123, and the snap-fit ​​protrusion 21 can enter into the snap-fit ​​groove 124 through the guide groove 122 and the annular groove 123 and engage with the snap-fit ​​groove 124.

[0043] In this way, the first end of the delivery tube 20 is inserted into the insertion hole 121 on the screw head 12, and bone cement is injected into the injection channel 111 through the delivery tube 20. The injection channel 111 delivers the bone cement through the through hole 112 to the outside of the screw body 11, thereby allowing the bone cement to be delivered into the autologous bone at the screw site. The bone cement at the screw site can flow into the autologous bone with low bone density and high porosity, fill the gaps in the autologous bone, and connect the autologous bone and the screw body 11, thereby improving the reliability of the connection between the screw and the autologous bone and reducing the risk of prosthesis loosening. Furthermore, through the arrangement of the guide groove 122, the annular groove 123, and the snap-fit ​​groove 124, during the insertion and engagement of the first end of the delivery pipe 20 with the insertion hole 121 on the screw head 12, the delivery pipe 20 can drive the snap-fit ​​protrusion 21 to move along the axial direction of the screw body 11 within the guide groove 122. When the snap-fit ​​protrusion 21 moves into the annular groove 123, rotating the delivery pipe 20 can drive the snap-fit ​​protrusion 21 to move circumferentially within the annular groove 123. After the delivery pipe 20 rotates by a preset angle, the snap-fit ​​protrusion 21 can move to the snap-fit ​​groove 124, and by moving the delivery pipe 20 along the axial direction of the screw body 11, the snap-fit ​​protrusion 21 engages with the snap-fit ​​groove. When the first end of the delivery pipe 20 separates from the screw head 12, the above steps are reversed. Through the above-described configuration, rapid connection and separation between the delivery tube 20 and the screw head 12 can be achieved, while also reducing the possibility of the screw head 12 detaching from the delivery tube 20. This makes the connection between the delivery tube 20 and the screw more reliable, facilitating the injection of bone cement. Therefore, the technical solution of this embodiment effectively solves the problem in related technologies where the connection between the bone screw and autologous bone is unreliable, easily leading to prosthesis loosening.

[0044] In this embodiment, a through hole 112 is provided between two adjacent threads on the screw body 11. Optionally, two adjacent through holes 112 are spaced apart by one thread. Optionally, the through hole 112 is provided starting from the end of the screw body 11 near the screw head 12. Optionally, no through hole 112 is provided at the end of the screw body 11 near the screw head 12, and the through hole 112 is provided from the middle of the length direction of the screw body 11 to the screw tip. Optionally, the screw tip has a small diameter, the screw tip is generally tapered, and the screw tip is provided with two self-tapping edges, which are centrally symmetrical about the axis of the screw body 11. The screw tip has a tapered transition with an included angle of 10° to 15°, which facilitates quick placement into the mounting hole 53 of the acetabular cup 50. The design of the screw tip allows the screw to be quickly screwed into the autologous bone. The injection channel 111 extends through the end of the screw body 11 opposite to the screw head 12 along the axial direction of the screw body 11.

[0045] In this embodiment, the insertion hole 121 is a hexagonal countersunk groove. The hexagonal countersunk groove facilitates the insertion of screws into the autologous bone with the aid of external tools. The delivery tube 20 includes a rigid tube at its first end and a flexible tube communicating with the rigid tube. The flexible tube allows the direction of the delivery tube 20 to be adjusted, facilitating the adjustment of the syringe direction according to different body positions and implantation environments. This also facilitates the handling and application of force during bone cement injection, adapting to various implantation angles and simplifying operation. The rigid tube facilitates insertion and also allows for the engagement of the protrusion 21.

[0046] like Figure 5 As shown, the syringe is connected to the second end of the delivery tube 20, and the syringe injects bone cement into the delivery tube 20. The syringe and the second end of the delivery tube 20 are tightly connected by threads. The syringe includes an injection tube 81 and a squeezer 82. The injection tube 81 has a receiving cavity, and the squeezer 82 is movably disposed in the receiving cavity to squeeze the bone cement in the receiving cavity into the delivery tube 20.

[0047] In this embodiment, the snap-fit ​​protrusion 21 is a floating snap-fit ​​bead. The floating snap-fit ​​bead is buoyantly disposed at the first end of the delivery pipe 20.

[0048] like Figure 2 and Figure 3As shown, the locking groove 124 is located on the side of the annular groove 123 away from the screw body 11. This allows the locking protrusion 21 on the delivery tube 20 to act as a physical barrier when it is subjected to a force away from the screw body 11 after entering the locking groove 124. This restricts the movement of the locking protrusion 21 within the annular groove 123, effectively preventing it from detaching from the screw head 12. This improves the reliability and anti-detachment performance of the connection between the delivery tube 20 and the screw head 12, ensuring that the connection between the delivery tube 20 and the screw head 12 remains secure during bone cement delivery. Furthermore, after the bone cement is injected into the injection channel 111, the bone cement exerts a force on the delivery tube 20 away from the screw body 11 due to flow resistance and other factors. This force helps to retain the locking protrusion 21 within the locking groove 124, further improving the reliability of the connection between the delivery tube 20 and the screw head 12.

[0049] like Figures 2 to 4 As shown, a first mark 22 is provided on the side wall of the delivery tube 20, which is used to position the snap-fit ​​protrusion 21. A second mark 125 is provided on the screw head 12, which is used to position the guide groove 122. A third mark 126 is provided on the screw head 12, which is used to position the snap-fit ​​groove 124. In this way, during operation, by observing the alignment of the first mark 22 and the second mark 125, the snap-fit ​​protrusion 21 can be aligned with the guide groove 122, ensuring that the snap-fit ​​protrusion 21 can smoothly enter the guide groove 122 when the delivery tube 20 is inserted into the insertion hole 121. Then, the delivery tube 20 is rotated to align the first mark 22 with the third mark 126. When the first mark 22 and the third mark 126 are aligned, the snap-fit ​​protrusion 21 can move accurately to the snap-fit ​​groove 124. By moving the delivery tube 20 in a direction away from the screw body 11, the snap-fit ​​protrusion 21 can enter the snap-fit ​​groove 124 to complete the locking. The coordinated action of the first identifier 22, the second identifier 125, and the third identifier 126 facilitates the positioning of the snap-fit ​​protrusion 21, reduces the difficulty of operation, and effectively improves the insertion efficiency and locking efficiency.

[0050] In this embodiment, in the axial direction of the delivery pipe 20, the first mark 22 at least partially coincides with the snap-fit ​​protrusion 21. In the diametrical direction of the screw head 12, the second mark 125 at least partially coincides with the guide groove 122. In a projection plane perpendicular to the axis of the screw body 11, the third mark 126 forms a first projection, and the snap-fit ​​groove 124 forms a second projection. In the diametrical direction of the screw head 12, the first projection and the second projection at least partially coincide. The second mark 125 and the third mark 126 are elongated grooves.

[0051] In other embodiments, a first mark 22 is provided on the side wall of the conveying pipe 20, which is used to position the snap-fit ​​protrusion 21. A second mark 125 is provided on the screw head 12, which is used to position the guide groove 122. Alternatively, a first mark 22 is provided on the side wall of the conveying pipe 20, which is used to position the snap-fit ​​protrusion 21. A third mark 126 is provided on the screw head 12, which is used to position the snap-fit ​​groove 124.

[0052] like Figure 1 As shown, there are multiple through holes 112, which are spaced apart along the axial direction of the screw body 11. The diameter of the through holes 112 gradually increases in the direction away from the screw head 12. In this way, combined with the injection channel 111 inside the screw body 11, the bone cement can be initially released from the smaller diameter through holes 112 near the screw head 12 during the injection process, while more bone cement is released from the larger diameter through holes 112 away from the screw head 12. This forms a gradient diffusion pattern along the screw axis, effectively avoiding the problem of bone cement accumulating at the end near the screw head 12 and insufficient injection at the end away from the screw head 12. This improves the uniform distribution of bone cement in the autologous bone, increases the connection strength between the screw body 11 and the autologous bone, and enhances the connection strength and stability between the screw and the surrounding autologous bone.

[0053] like Figures 6 to 11 As shown, this application also provides an acetabular cup prosthesis assembly, which includes a screw assembly and an acetabular cup, wherein the screw assembly is the aforementioned screw assembly. Because the aforementioned screw assembly can solve the problem of unreliable connection between bone screws and autologous bone in related technologies, which easily leads to prosthesis loosening, the acetabular cup prosthesis assembly with this screw assembly can solve the same technical problem.

[0054] like Figures 7 to 9As shown, the screw assembly also includes a connecting rod 31 disposed at the first end of the delivery tube 20. A locking ball 32 is disposed at the end of the connecting rod 31, and the diameter of the locking ball 32 is larger than the diameter of the connecting rod 31. The acetabular cup includes an outer acetabular cup 50 and an inner acetabular cup 60 disposed within the outer acetabular cup 50. The outer acetabular cup 50 has a slot for receiving the locking ball 32. The slot penetrates the inner surface of the outer acetabular cup 50 and forms a socket 51 and a locking opening 52 communicating with the socket 51. The diameter of the socket 51 is greater than or equal to the diameter of the locking ball 32, and the width of the locking opening 52 is less than the diameter of the locking ball 32 but greater than or equal to the diameter of the connecting rod 31. The locking ball 32 is movably disposed within the slot. The diameter of the locking ball 32 is greater than the diameter of the connecting rod 31, and the diameter of the socket 51 is greater than or equal to the diameter of the locking ball 32, allowing the locking ball 32 to enter the slot through the socket 51. The width of the locking opening 52 is smaller than the diameter of the locking ball 32 and greater than or equal to the diameter of the connecting rod 31, so that the locking ball 32 will not dislodge from the locking opening 52 when it moves within the slot, thus forming an anti-dislodgement fit between the locking ball 32 and the locking opening 52, and the locking opening 52 can prevent the movement of the connecting rod 31. This configuration allows the screw assembly to be detachably connected to the acetabular cup 50, enabling the delivery tube 20 to connect with the acetabular cup 50 when bone cement is injected, making the connection between the delivery tube 20 and the screw more reliable.

[0055] In this embodiment, the slot width is greater than or equal to the diameter of the locking ball 32. The acetabular cup 50 has a mounting hole 53, the screw head 12 is disposed within the mounting hole 53, and the screw body 11 is inserted into the autologous bone to connect the acetabular cup 50 to the autologous bone. The surface of the screw head 12 facing the screw body 11 is a first arc surface, and the wall of the mounting hole 53 is a second arc surface. Through the cooperation of the first and second arc surfaces, the angle of the screw body 11 relative to the acetabular cup 50 can be adjusted by at least 20°. The diameter of the mounting hole 53 is larger than the diameter of the screw body 11 so that the screw body 11 can pass smoothly through the mounting hole 53 and be fully exposed outside the acetabular cup 50. The minimum diameter of the mounting hole 53 is smaller than the diameter of the screw head 12 to prevent the screw head 12 from dislodging from the mounting hole 53. Multiple mounting holes 53 are provided on the acetabular cup 50 to reduce the weight of the acetabular cup 50 and provide more channels for screw placement.

[0056] like Figures 7 to 9As shown, the locking opening 52 is a strip-shaped opening with a stop surface 521 opposite to the insertion opening 51 along its extending direction. The conveying pipe 20 rotates to allow the locking ball 32 to move from the insertion opening 51 to the locking opening 52 within the slot. When the locking ball 32 is located at the insertion opening 51, the engaging protrusion 21 is located within the guide groove 122. When the locking ball 32 is located at the locking opening 52 and contacts the stop surface 521, the engaging protrusion 21 is correspondingly positioned with the engaging groove 124. Thus, through the above arrangement, when the conveying pipe 20 rotates at a preset angle, it can move the locking ball 32 from the insertion opening 51 to the locking opening 52, while simultaneously moving the engaging protrusion 21 from the position where the annular groove 123 communicates with the guide groove 122 to the position where the annular groove 123 communicates with the engaging groove 124, thereby facilitating the engaging engagement of the engaging protrusion 21 and the engaging groove 124. Furthermore, due to the stop engagement between the locking ball 32 and the stop surface 521, the locking ball 32 cannot move further away from the socket 51, thus preventing the delivery pipe 20 from rotating further. This avoids misalignment between the locking protrusion 21 and the locking groove 124, making the alignment of the locking protrusion 21 and the locking groove 124 more convenient and accurate, facilitating the connection between the delivery pipe 20 and the screw head 12. The above-mentioned structure is simple, easy to link, and convenient to operate.

[0057] like Figures 7 to 9As shown, a mounting protrusion 41 is fixedly provided on the side wall of the conveying pipe 20. The screw assembly also includes a screw rod 42 fixedly provided on the mounting protrusion 41 and a nut 43 sleeved on the screw rod 42, with the nut 43 threadedly engaged with the screw rod 42. A through hole is provided on the connecting rod 31, and the screw rod 42 passes through the through hole. When the nut 43 moves on the screw rod 42, the nut 43 can rotate relative to the connecting rod 31, and the nut 43 can adjust the position of the connecting rod 31 on the screw rod 42. In this way, the nut 43 can rotate relative to the connecting rod 31 to facilitate the threaded engagement between the nut 43 and the screw rod 42. The nut 43 rotates on the screw rod 42 and moves along the axial direction of the screw rod 42. When the nut 43 moves along the axial direction of the screw rod 42, it can adjust the position of the connecting rod 31 on the screw rod 42, thereby driving the connecting rod 31 to move along the axial direction of the screw rod 42. The end face of the first end of the delivery tube 20 is a preset end face, and the apex of the locking ball 32 facing the screw body 11 is a preset apex. The connecting rod 31 moves along the axial direction of the screw 42 so that the distance between the preset end face and the preset apex along the axial direction of the delivery tube 20 can be adjusted. Due to the anti-disengagement engagement between the locking ball 32 and the locking port 52, the preset apex is stationary relative to the acetabular outer cup 50, and the preset end face can move along the axial direction of the delivery tube 20. Thus, by moving the nut 43 on the screw 42, the preset end face can be moved along the axial direction of the delivery tube 20, thereby causing the snap-fit ​​protrusion 21 on the first end of the delivery tube 20 to move along the axial direction of the delivery tube 20. This facilitates the snap-fit ​​protrusion 21 moving along the guide groove 122 into the annular groove 123, and also facilitates the snap-fit ​​protrusion 21 entering the snap-fit ​​groove 124 from the annular groove 123 and engaging with the snap-fit ​​groove 124. The use of nut 43 and screw 42 makes the movement of snap-fit ​​protrusion 21 more precise and reliable, facilitating the insertion and locking of snap-fit ​​protrusion 21 on conveying pipe 20 with screw head 12.

[0058] In this embodiment, when the snap-fit ​​protrusion 21 is located at the end of the guide groove 122 away from the annular groove 123, the nut 43 is rotated to move the nut 43 away from the screw body 11. Due to the anti-disengagement engagement between the locking ball 32 and the locking port 52, the preset apex is stationary relative to the acetabular outer cup 50, allowing the preset end face to move in a direction close to the screw body 11. This allows the snap-fit ​​protrusion 21 on the first end of the delivery tube 20 to move in a direction close to the screw body 11, so that the snap-fit ​​protrusion 21 can move along the guide groove 122 and enter the annular groove 123. When the snap-fit ​​protrusion 21 is located in the annular groove 123 and is correspondingly set with the snap-fit ​​groove 124, since the snap-fit ​​groove 124 is located on the side of the annular groove 123 away from the screw body 11, the nut 43 is rotated so that the nut 43 moves in the direction close to the screw body 11. Due to the anti-disengagement engagement between the locking ball 32 and the locking port 52, the preset apex is stationary relative to the acetabular outer cup 50, so that the preset end face can move in the direction away from the screw body 11. Thus, the snap-fit ​​protrusion 21 on the first end of the delivery tube 20 can move in the direction away from the screw body 11, so that the snap-fit ​​protrusion 21 can enter the snap-fit ​​groove 124 located on the side of the annular groove 123 away from the screw body 11 in the direction away from the screw body 11, and so that the snap-fit ​​protrusion 21 can engage with the snap-fit ​​groove 124.

[0059] In this embodiment, the axial direction of the screw 42 is parallel to the axial direction of the conveying pipe 20.

[0060] In other embodiments, the connecting rod 31 is further provided with an annular groove surrounding the outside of the through hole. The nut 43 is provided with a connecting protrusion that extends into the annular groove and engages with the annular groove to prevent disengagement. When the nut 43 rotates, the connecting protrusion rotates within the annular groove, and through the engagement between the connecting protrusion and the annular groove, the rotation of the nut 43 enables the connecting rod 31 to move along the axial direction of the screw 42.

[0061] like Figures 7 to 9 As shown, the screw assembly also includes a spring 44, which is sleeved on the outside of the screw 42. The first end of the spring 44 abuts against the mounting protrusion 41, and the second end abuts against the connecting rod 31. The connecting rod 31 is located between the spring 44 and the nut 43. The spring 44 allows the connecting rod 31 to abut against the nut 43, enabling it to move along the axis of the screw 42 following the nut 43. The spring 44 presses the connecting rod 31 against the nut 43, facilitating movement of the connecting rod 31 when the nut 43 moves. The length of the spring 44 can adapt to these changes. Furthermore, the spring 44 allows the nut 43 to rotate relative to the connecting rod 31. This design is simple, easy to manufacture, and convenient to use.

[0062] In this embodiment, the first end of the spring 44 is welded to the mounting protrusion 41.

[0063] like Figure 10 and Figure 11 As shown, the acetabular cup includes an external acetabular cup 50 and an internal acetabular cup 60 disposed within the external acetabular cup 50. The internal acetabular cup 60 is provided with retaining flaps 71, and the external acetabular cup 50 is provided with retaining heads 72. Multiple retaining flaps 71 are spaced apart circumferentially, forming retaining holes. The retaining heads 72 can be inserted into the retaining holes and engage with the retaining flaps 71. The external acetabular cup 50 and the internal acetabular cup 60 achieve quick and stable assembly through the retaining structure of the retaining flaps 71 and retaining heads 72. The retaining heads 72 can be inserted into the retaining holes and engage with each retaining flap 71. This structure achieves reliable fixation between the external acetabular cup 50 and the internal acetabular cup 60 without bolts, adhesives, or welding, making operation simple and the connection reliable.

[0064] like Figure 11 As shown, a wedge 711 is provided on the card slot 71, and multiple wedges 711 on multiple card slots 71 are arranged opposite each other. A preset inclined surface is provided on the wedge 711, which gradually moves away from the center line of the card hole along the direction from the root to the top of the card slot 71. The surface of the wedge 711 facing the root of the card slot 71 has a first stop surface. An annular boss 721 is provided on the card head 72, and the diameter of the annular boss 721 gradually decreases along the direction from the root to the top of the card head 72. The annular boss 721 facing the root of the card head 72 has a second stop surface. When the card head 72 is inserted into the card hole and engages with the card slot 71, the first stop surface and the second stop surface engage to fix the annular boss 721 within the card hole. Furthermore, when the sidewall of the annular boss 721 abuts against the preset inclined surface, the top of the latch 71 is a free end, and the top of the latch 71 swings away from the center line of the latch hole.

[0065] In this embodiment, the acetabular inner cup 60 is provided with two retaining flaps 71, which are arranged radially opposite to each other along the acetabular inner cup 60. The annular boss 721, in its axial cross-sectional view, forms a trapezoid, with its two sides forming a preset angle less than or equal to 30°. The acetabular outer cup 50 is provided with two retaining heads 72, which are arranged radially opposite to each other along the acetabular outer cup 50. The bottom of the acetabular inner cup 60 and the bottom of the acetabular outer cup 50 are fixedly connected by bolts.

[0066] In other embodiments, the external acetabular cup 50 is provided with a retaining flap 71, and the internal acetabular cup 60 is provided with a retaining head 72.

[0067] It should be noted that the injection channel 111 and delivery tube 20 can be used to deliver other fluid media capable of connecting screws to autologous bone, not limited to bone cement. Alternatively, the injection channel 111 and delivery tube 20 can be used to deliver drugs such as antibiotics.

[0068] Optionally, a bone cement groove can be provided at the contact point between the outer surface of the acetabular external cup 50 and the autologous bone to improve the fixation ability of the bone cement. Alternatively, the contact point between the outer surface of the acetabular external cup 50 and the autologous bone can be a porous trabecular structure, which can be made using 3D printing technology and made of titanium alloy or tantalum metal, or the 3D-printed porous trabecular structure can be treated with titanium spraying or hydroxyapatite spraying. Alternatively, a bone cement groove and a porous trabecular structure can be provided at the contact point between the outer surface of the acetabular external cup 50 and the autologous bone to achieve directional bone ingrowth of human bone.

[0069] In this embodiment, the screw root diameter should be larger than that of a solid screw with the same outer diameter to enhance the mechanical properties of the hollow acetabular screw.

[0070] In the description of this invention, it should be understood that "a plurality of" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0071] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0072] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hip acetabular cup prosthesis assembly, characterized in that, The acetabular cup prosthesis assembly includes a screw assembly and an acetabular cup. The screw assembly includes: A screw includes a screw body (11) and a screw head (12) connected to the screw body (11). The screw body (11) has an injection channel (111) inside, and a through hole (112) communicating with the injection channel (111) is provided on the side wall of the screw body (11). The screw head (12) has an insertion hole (121) communicating with the injection channel (111), and a guide groove (122) and an annular groove (123) are provided on the wall of the insertion hole (121). 23) and a snap-fit ​​groove (124); the guide groove (122) extends along the axial direction of the screw body (11), and the first end of the guide groove (122) penetrates the surface of the screw head (12); the annular groove (123) is connected to the second end of the guide groove (122), the snap-fit ​​groove (124) is connected to the annular groove (123), and the guide groove (122) and the snap-fit ​​groove (124) are circumferentially offset along the annular groove (123); The first end of the conveying pipe (20) can be inserted into the socket (121), and a snap-fit ​​protrusion (21) is provided on the outer side wall of the first end of the conveying pipe (20). The snap-fit ​​protrusion (21) can be guided and engaged with the guide groove (122) and the annular groove (123). The snap-fit ​​protrusion (21) can enter the snap-fit ​​groove (124) through the guide groove (122) and the annular groove (123) and engage with the snap-fit ​​groove (124). A connecting rod (31) is provided on the first end of the conveying pipe (20), and a locking ball (32) is provided at the end of the connecting rod (31), the diameter of the locking ball (32) being larger than the diameter of the connecting rod (31); The acetabular cup includes an external acetabular cup (50) and an internal acetabular cup (60) disposed within the external acetabular cup (50). The external acetabular cup (50) is provided with a slot for accommodating the locking ball (32). The slot penetrates the inner surface of the external acetabular cup (50) and forms a socket (51) and a locking opening (52) communicating with the socket (51). The diameter of the socket (51) is greater than or equal to the diameter of the locking ball (32). The width of the locking opening (52) is less than the diameter of the locking ball (32) and greater than or equal to the diameter of the connecting rod (31). The locking ball (32) is movably disposed within the slot.

2. The acetabular cup prosthesis assembly according to claim 1, characterized in that, The snap-fit ​​groove (124) is located on the side of the annular groove (123) away from the screw body (11).

3. The acetabular cup prosthesis assembly according to claim 1, characterized in that, A first mark (22) is provided on the side wall of the delivery pipe (20), and the first mark (22) is used to locate the snap-fit ​​protrusion (21). The screw head (12) is provided with a second mark (125), which is used to locate the guide groove (122); and / or, The screw head (12) is provided with a third mark (126), which is used to locate the snap-fit ​​groove (124).

4. The acetabular cup prosthesis assembly according to claim 1, characterized in that, There are multiple through holes (112), and the multiple through holes (112) are spaced apart along the axial direction of the screw body (11). The diameter of the multiple through holes (112) gradually increases in the direction away from the screw head (12).

5. The acetabular cup prosthesis assembly according to claim 1, characterized in that, The locking opening (52) is a strip-shaped opening, and the strip-shaped opening has a stop surface (521) that is opposite to the insertion opening (51) along its extension direction. The delivery pipe (20) rotates so that the locking ball (32) can move from the insertion opening (51) to the locking opening (52) in the slot. When the locking ball (32) is located at the insertion opening (51), the snap-fit ​​protrusion (21) is located in the guide groove (122). When the locking ball (32) is located at the locking opening (52) and contacts the stop surface (521), the snap-fit ​​protrusion (21) is correspondingly arranged with the snap-fit ​​groove (124).

6. The acetabular cup prosthesis assembly according to claim 5, characterized in that, The side wall of the conveying pipe (20) is fixedly provided with a mounting protrusion (41). The screw assembly also includes a screw (42) fixedly provided on the mounting protrusion (41) and a nut (43) sleeved on the screw (42). The nut (43) is threadedly engaged with the screw (42). The connecting rod (31) is provided with a through hole, and the screw (42) passes through the through hole. When the nut (43) moves on the screw (42), the nut (43) can rotate relative to the connecting rod (31), and the nut (43) can adjust the position of the connecting rod (31) on the screw (42).

7. The acetabular cup prosthesis assembly according to claim 6, characterized in that, The screw assembly also includes a spring (44) sleeved on the outside of the screw (42), with the first end of the spring (44) abutting against the mounting protrusion (41) and the second end of the spring (44) abutting against the connecting rod (31); the connecting rod (31) is located between the spring (44) and the nut (43).

8. The acetabular cup prosthesis assembly according to claim 1, characterized in that, The acetabular cup includes an external acetabular cup (50) and an internal acetabular cup (60) disposed within the external acetabular cup (50). One of the external acetabular cup (50) and the internal acetabular cup (60) is provided with a retaining flap (71), and the other of the external acetabular cup (50) and the internal acetabular cup (60) is provided with a retaining head (72). The retaining flaps (71) are multiple and spaced apart along the circumference. The multiple retaining flaps (71) form a retaining hole, and the retaining head (72) can be inserted into the retaining hole and engage with the retaining flaps (71).

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