Femoral head surface replacement prosthesis components

Abstract

This invention provides a femoral head surface replacement prosthesis assembly. The assembly includes an articular portion comprising a spherical body and a base. The base includes sidewalls and a bottom wall. The bottom of the spherical body is connected to the sidewalls of the base. The spherical body and the base together form an inner cavity of the articular portion. At least two first through holes communicating with the inner cavity are provided on the sidewalls of the base. This invention's femoral head surface replacement prosthesis assembly solves the problem of existing femoral head surface replacement prostheses being too heavy, causing patients to experience a significant foreign body sensation post-surgery and resulting in poor patient comfort.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a femoral head surface replacement prosthesis component. Background Technology

[0002] In recent years, the incidence of avascular necrosis of the femoral head (ONFH) has increased significantly worldwide, especially among young and middle-aged adults, who often have higher quality of life and activity demands. For cases of ONFH that have progressed to the middle or late stages, traditional total hip arthroplasty (THA) has long been considered the most effective treatment. However, THA involves the complete removal and replacement of the femoral head and acetabulum, which is not only highly complex and invasive, but also carries the risk of multiple revision surgeries for younger patients due to their longer life expectancy. Furthermore, the long-term efficacy of THA may be compromised in young, active individuals due to high activity levels and mechanical stress. Femoral head resurfacing, as an emerging minimally invasive treatment method, is gradually gaining attention in the medical community. Compared to total hip replacement, the core advantage of this procedure is that it preserves the femoral head structure and only replaces the necrotic or damaged parts, thereby maximizing the preservation of the original biomechanical properties of the femoral head and the bone mass of the femoral shaft, reducing surgical trauma, shortening the recovery period, and also delaying the time when the patient may need to undergo total hip replacement in the future, thus reducing the risk and burden of multiple surgeries.

[0003] Most femoral head resurfacing prostheses are single-cup spherical designs, forming a gold-cartilage interface. Inappropriate selection of the spherical diameter can accelerate wear and tear on the acetabular cartilage. For patients with localized femoral head collapse and limited necrotic areas, partial femoral head resurfacing prosthesis replacement becomes an option, addressing the necrotic area while avoiding unnecessary damage to healthy cartilage and bone structure. With advancements in medical materials, cobalt-chromium femoral head resurfacing prostheses have become the mainstream choice due to their high polish, low wear rate, and good biocompatibility. However, the high density of cobalt-chromium alloys, compared to lightweight materials like pure titanium, results in excessive prosthesis weight, leading to a noticeable foreign body sensation post-surgery, especially during weight-bearing and walking activities, resulting in poor patient comfort. Summary of the Invention

[0004] The main objective of this invention is to provide a femoral head surface replacement prosthesis component that can solve the problem that existing femoral head surface replacement prostheses are too heavy, causing patients to experience a significant foreign body sensation and poor patient comfort after surgery.

[0005] To achieve the above objectives, the present invention provides a femoral head surface replacement prosthesis assembly, comprising: a joint portion, including a spherical body and a base, the base including a side wall and a bottom wall, the bottom of the spherical body being connected to the side wall of the base, the spherical body and the base together forming the inner cavity of the joint portion, and at least two first through holes communicating with the inner cavity being provided on the side wall of the base.

[0006] Furthermore, the femoral head surface replacement prosthesis assembly also includes a protective component, which has at least two second through holes. At least two first through holes and at least two second through holes are configured one-to-one. When the spherical body is polished, the protective component is fixedly fitted around the outer periphery of the base, and the protective component completely covers the base.

[0007] Furthermore, the femoral head surface replacement prosthesis assembly also includes at least two first sealing members, each corresponding to one of the at least two first through holes, with the first sealing members sealing the corresponding first through holes; or, the femoral head surface replacement prosthesis assembly also includes at least two second sealing members, each corresponding to one of the at least two second through holes, with the second sealing members sealing the corresponding second through holes and first through holes in sequence when the spherical body is polished.

[0008] Furthermore, the femoral head replacement prosthesis assembly also includes a support mesh, which is disposed within the cavity, and the outer peripheral surface of the support mesh is connected to the inner wall surface of the cavity.

[0009] Furthermore, the femoral head replacement prosthesis assembly also includes a transition structure, the first end of which is connected to the base to form an anti-rotation fit.

[0010] Furthermore, the adapter structure includes an adapter body and at least one limiting structure mounted on the adapter body. A conical groove is provided on the bottom wall of the base and one of the adapter body, and a conical protrusion is provided on the bottom wall of the base and the other of the adapter body that can engage with the conical groove. At least one slot is provided on the bottom wall of the base, and at least one slot is provided in correspondence with at least one limiting structure. The limiting structure has a locked state that engages with the corresponding slot and an unlocked state that disengages from the corresponding slot. The limiting structure is movably arranged relative to the adapter body along a first direction to switch between the locked state and the unlocked state.

[0011] Furthermore, the limiting structure includes a limiting rod, and the femoral head surface replacement prosthesis assembly also includes at least one driving structure, with at least one driving structure corresponding to at least one limiting rod. The adapter body has at least one mounting cavity, with at least one mounting cavity corresponding to at least one driving structure. The driving structure is rotatably disposed in the corresponding mounting cavity, and the driving structure is movably disposed relative to the adapter body along a second direction to drive the corresponding limiting rod to move along a first direction.

[0012] Furthermore, the limiting structure also includes a first elastic element, with each limiting rod fitted with a first elastic element and a stop portion provided on the limiting rod. When the limiting structure is in the locked state, the first elastic element elastically abuts against the stop portion and the bottom wall of the corresponding slot. The driving structure includes a first cylindrical segment and a second cylindrical segment arranged and connected sequentially along the second direction. The first cylindrical segment and the second cylindrical segment are coaxially arranged, and the diameter of the first cylindrical segment is larger than the diameter of the second cylindrical segment. When the limiting structure is in the locked state, the bottom of the limiting rod abuts against the outer circumferential surface of the first cylindrical segment. When the limiting structure is in the unlocked state, the bottom of the limiting rod abuts against the outer circumferential surface of the second cylindrical segment.

[0013] Furthermore, a first annular protrusion is provided at the end where the first cylindrical segment connects to the second cylindrical segment. The first annular protrusion includes a receiving cavity and a first conical segment. The cross-sectional area of ​​the first conical segment gradually decreases along the direction close to the second cylindrical segment. A second annular protrusion is slidably provided on the first cylindrical segment. The second annular protrusion includes a second conical segment and a third conical segment. The cross-sectional area of ​​the second conical segment gradually increases along the direction close to the second cylindrical segment, and the cross-sectional area of ​​the third conical segment gradually decreases along the direction close to the second cylindrical segment. The ends of the second conical segment and the third conical segment facing each other are connected to form a first tip. When the limiting structure is in the locked state, the first annular protrusion can form a stop and limit the bottom of the limiting rod in the second direction. The receiving cavity can accommodate the third conical segment. When the third conical segment is located in the receiving cavity, the end of the second conical segment close to the second cylindrical segment and the end of the first annular protrusion away from the second cylindrical segment form a second tip.

[0014] Furthermore, the femoral head replacement prosthesis assembly also includes a patch that is mounted at the bottom of the adapter structure and is movable relative to the adapter structure along the circumference of the adapter structure.

[0015] Furthermore, the femoral head replacement prosthesis assembly also includes at least one locking component located on the movement path of the patch. The at least one locking component is configured in a one-to-one correspondence with at least one mounting cavity. The locking component is installed in the corresponding mounting cavity and has a locking position for locking the patch in the current position and an unlocking position for disengaging from the patch.

[0016] Furthermore, the locking component includes a locking member and a second elastic member. The locking member is located on the moving path of the drive structure. The bottom of the transition structure is provided with an annular groove, and the mounting cavity communicates with the annular groove. The top of the patch is engaged in the annular groove. One end of the locking member is fixedly provided with a first stop, and the mounting cavity is fixedly provided with a second stop. The second elastic member is sleeved on the outer periphery of the locking member and elastically abuts between the first stop and the second stop. The second stop is provided with a third through hole, and the bottom of the locking member protrudes through the third through hole. When the limiting structure is in the unlocked state, the locking member disengages from the corresponding patch. When the limiting structure is in the locked state, the bottom of the locking member abuts against the top of the corresponding patch.

[0017] Furthermore, the femoral head surface replacement prosthesis assembly also includes a connecting structure. Along the length of the connecting structure, the connecting structure includes a first threaded segment and a second threaded segment. The first threaded segment is threadedly connected to the adapter structure, and the threads of the first threaded segment and the second threaded segment have opposite directions.

[0018] The present invention provides a joint portion comprising a spherical body and a base. The base includes a side wall and a bottom wall. At least two first through holes communicating with the inner cavity are provided on the side wall of the base. The joint portion of this application is manufactured by 3D printing. During the 3D printing process, incompletely cured powder is left in the inner cavity of the joint portion. At this time, gas (e.g., inert gas or compressed air) can be introduced into the inner cavity through at least one first through hole, so that the residual powder is blown out of the inner cavity of the joint portion from the other first through holes. This can significantly reduce the weight of the joint portion, thereby solving the problem that the existing femoral head replacement prosthesis is too heavy, causing patients to feel obvious foreign body sensation after surgery, and improving the patient's comfort. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, 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:

[0020] Figure 1 A schematic diagram of the structure of a femoral head surface replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0021] Figure 2 A structural schematic diagram of the joint portion at one angle according to an embodiment of the present invention is shown;

[0022] Figure 3 A partial structural cross-sectional view of a femoral head surface replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0023] Figure 4 A cross-sectional view of the joint portion according to an embodiment of the present invention is shown;

[0024] Figure 5 A cross-sectional view of a femoral head replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0025] Figure 6 A structural schematic diagram of the joint portion from another angle according to an embodiment of the present invention is shown;

[0026] Figure 7 A cross-sectional view of the adapter structure according to an embodiment of the present invention is shown;

[0027] Figure 8 It shows Figure 7 Enlarged view of point A;

[0028] Figure 9 A partial structural schematic diagram of a femoral head surface replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0029] Figure 10 A partial structural schematic diagram of a femoral head surface replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0030] Figure 11 A partial structural schematic diagram of a femoral head surface replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0031] Figure 12 A partial structural schematic diagram of a femoral head surface replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0032] Figure 13 A partial structural schematic diagram of a femoral head surface replacement prosthesis assembly according to an embodiment of the present invention is shown;

[0033] Figure 14 A schematic diagram of the connection structure according to an embodiment of the present invention is shown;

[0034] Figure 15 A cross-sectional view of the connection structure according to an embodiment of the present invention is shown.

[0035] The above figures include the following reference numerals:

[0036] 10. Joint; 11. Spherical body; 12. Base; 121. First through hole; 122. Slot; 123. Conical groove; 20. Protective component; 21. Second through hole; 30. Support mesh; 40. Adapter structure; 41. Adapter body; 411. Mounting cavity; 4111. Fourth threaded section; 412. Second stop; 42. Limiting structure; 421. Limiting rod; 4211. Stop; 4212. Inclined surface; 422. First elastic element; 43. Conical protrusion; 44. Annular groove; 50. Drive structure; 51. First cylindrical section; 52. First annular protrusion; 521. First conical segment; 53. Second cylindrical segment; 54. Third threaded segment; 55. Operating part; 56. Second annular protrusion; 561. Second conical segment; 562. Third conical segment; 57. Stop protrusion; 60. Patch; 70. Connecting structure; 71. First threaded segment; 72. Second threaded segment; 73. Fourth through hole; 80. Bone trabecular mesh structure; 90. First sealing element; 100. Locking assembly; 101. Locking element; 102. Second elastic element; 1021. Third through hole; 103. First stop element. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] See also Figures 1 to 15 As shown, the present invention provides a femoral head surface replacement prosthesis assembly, which includes: a joint portion 10, including a spherical body 11 and a base 12. The base 12 includes a side wall and a bottom wall. The bottom of the spherical body 11 is connected to the side wall of the base 12. The spherical body 11 and the base 12 together form the inner cavity of the joint portion 10. At least two first through holes 121 communicating with the inner cavity are provided on the side wall of the base 12.

[0039] In this embodiment, at least two first through holes 121 communicating with the inner cavity are provided on the side wall of the base 12. During the operation, the first through holes 121 can be used as instrument holding holes to facilitate the contact and operation of surgical instruments with the prosthesis, so that the prosthesis can be implanted more stably and accurately into the predetermined position of the femoral head. The joint part 10 of this application is made by 3D printing. During the 3D printing process, the incompletely cured powder will be left in the inner cavity of the joint part 10. At this time, gas (e.g., inert gas or compressed air) can be introduced into the inner cavity through at least one first through hole 121, so that the residual powder can be blown out of the inner cavity of the joint part 10 from the other first through holes 121. This can significantly reduce the weight of the joint part 10, thereby solving the problem that the existing femoral head replacement prosthesis is too heavy, causing patients to feel obvious foreign body sensation after surgery, and improving the patient's comfort.

[0040] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the femoral head surface replacement prosthesis assembly further includes a protective member 20. The protective member 20 is provided with at least two second through holes 21, and at least two first through holes 121 are provided in a one-to-one correspondence with at least two second through holes 21. When the spherical body 11 is polished, the protective member 20 is fixedly sleeved on the outer periphery of the base 12, and the protective member 20 completely covers the base 12.

[0041] In this embodiment, when polishing the spherical body 11, the protective member 20 is fixedly sleeved on the outer periphery of the base 12 and completely covers the base 12, ensuring that polishing media such as polishing paste only act on the spherical body 11 that needs to be treated, and will not contaminate the surface of the base 12.

[0042] In one embodiment of the present invention, the thickness of the protective component 20 is in the range of 1mm to 2mm and is made of metal material, which can not only protect the base, but also reduce the total weight of the prosthesis assembly.

[0043] In one embodiment of the present invention, the diameters of the first through hole 121 and the second through hole 21 are both in the range of 3mm to 5mm. This ensures both structural strength and the rate of powder discharge.

[0044] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the femoral head surface replacement prosthesis assembly further includes at least two first sealing members 90, and the at least two first sealing members 90 are configured in a one-to-one correspondence with at least two first through holes 121, with the first sealing members 90 sealing the corresponding first through holes 121.

[0045] In this embodiment, before the powder remaining in the inner cavity of the joint 10 is blown out of the inner cavity of the joint 10 through the first through hole 121, the first sealing member 90 does not block the first through hole 121. After the powder in the inner cavity is completely blown out, the first sealing member 90 blocks the corresponding first through hole 121. In this way, when polishing the spherical body 11 in the subsequent process, it can be ensured that polishing paste and other polishing media only act on the spherical body 11 that needs to be treated, and will not enter the inner cavity of the joint 10 and contaminate the inner cavity of the joint 10. At the same time, after the surgical implantation is completed, the first through hole 121 is blocked by the first sealing member 90, which can effectively isolate the external environment, prevent bacteria and other foreign substances from invading the inner cavity, and reduce the risk of infection after surgery.

[0046] In one embodiment, the first through hole 121 is a threaded hole, and the first sealing member 90 is a threaded plug (e.g., a screw).

[0047] See also Figures 1 to 15As shown, in one embodiment of the present invention, the femoral head surface replacement prosthesis assembly further includes at least two second sealing members, which are configured in a one-to-one correspondence with at least two second through holes 21. When the spherical body 11 is polished, the second sealing members sequentially seal the corresponding second through holes 21 and first through holes 121.

[0048] In this embodiment, during polishing of the spherical body 11, the second sealing member sequentially seals the second through hole 21 and the corresponding first through hole 121, forming a more robust isolation barrier to prevent polishing paste from entering the inner cavity of the joint portion 10. After polishing of the spherical body 11, the protective member 20 and the second sealing member are removed from the base 12, and then the joint portion 10 is subjected to secondary powder blowing to expel the powder from the inner cavity of the joint portion 10.

[0049] In one embodiment, the second through hole 21 is a threaded hole, and the second sealing member is a threaded plug (e.g., a screw). In this case, on the one hand, the threaded plug can block the first through hole 121 and the second through hole 21, and on the other hand, the threaded plug can also achieve a fixed connection between the protective member 20 and the joint 10.

[0050] In one embodiment, both the first through hole 121 and the second through hole 21 are M8 threaded holes, and the second sealing member is a threaded plug adapted to the threaded hole. During surgical implantation, the M8 threaded hole can be used as a holding hole, where a special instrument is used to hold the prosthesis for implantation. After implantation, the second sealing member is used to seal the first through hole 121 and the second through hole 21, which can prevent bacteria from entering the inner cavity of the joint 10, prevent dead corners caused by the prosthesis design, and thus reduce the occurrence of infection.

[0051] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the femoral head surface replacement prosthesis assembly further includes a support mesh 30, which is disposed in the inner cavity, and the outer peripheral surface of the support mesh 30 is connected to the inner wall surface of the inner cavity.

[0052] In this embodiment, the femur is the main weight-bearing and mobile joint of the human body. Considering that the repaired femoral head has collapsed or the necrotic area is too large, the joint portion 10 must have sufficient support strength. Therefore, a support net 30 is provided in the inner cavity of the joint portion 10, which can enhance the structural strength of the joint portion 10 without significantly increasing the weight. The support net 30 is tightly connected to the inner wall of the cavity, which can effectively disperse the pressure borne by the femoral head and avoid local deformation or damage of the joint portion 10 during daily use after implantation, ensuring that the joint portion 10 has sufficient stability when bearing the weight of the human body and the exercise load.

[0053] See also Figures 1 to 15As shown, in one embodiment of the present invention, the femoral head surface replacement prosthesis assembly further includes a transition structure 40, the first end of which is connected to the base 12 to form an anti-rotation fit.

[0054] In this embodiment, the first end of the adapter structure 40 is connected to the base 12 to form an anti-rotation fit. Through the anti-rotation fit between the first end of the adapter structure 40 and the base 12, the risk of wear and loosening of the prosthesis can be reduced, while ensuring a stable connection between the prosthesis and the femoral head, maintaining the normal operation of joint function, and preventing the conical protrusion 43 from failing due to excessive torque. As can be seen from the above, the connection between the adapter structure 40 and the base 12 not only provides mechanical support, but also increases the firmness of the connection through the anti-rotation design.

[0055] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the adapter structure 40 includes an adapter body 41 and at least one limiting structure 42 mounted on the adapter body 41. A conical groove 123 is provided on one of the bottom wall of the base 12 and the adapter body 41, and a conical protrusion 43 is provided on the other of the bottom wall of the base 12 and the adapter body 41, which can engage with the conical groove 123. At least one slot 122 is provided on the bottom wall of the base 12, and at least one slot 122 is provided in a one-to-one correspondence with at least one limiting structure 42. The limiting structure 42 has a locked state that engages with the corresponding slot 122 and an unlocked state that disengages from the corresponding slot 122. The limiting structure 42 is movably disposed relative to the adapter body 41 along a first direction to switch between the locked state and the unlocked state.

[0056] In this embodiment, the snap-fit ​​between the conical groove 123 and the conical protrusion 43 enables the connection between the base 12 and the adapter body 41. When the limiting structure 42 is in the locked state, the limiting structure 42 is inserted into the slot 122, which enables the anti-rotation fit between the base 12 and the adapter body 41, preventing the prosthesis from accidentally moving or loosening after implantation. When the limiting structure 42 is in the unlocked state, the limiting structure 42 can be dislodged from the slot 122, facilitating adjustments during surgery or subsequent revision operations, thereby improving the flexibility and maintainability of the prosthesis assembly.

[0057] It should be noted that, since it is a partial replacement of the femoral head surface, both the conical groove 123 and the conical protrusion 43 can be set eccentrically.

[0058] See also Figures 1 to 15As shown, in one embodiment of the present invention, the limiting structure 42 further includes a first elastic element 422. Each limiting rod 421 is fitted with a first elastic element 422. The limiting rod 421 is provided with a stop portion 4211. When the limiting structure 42 is in the locked state, the first elastic element 422 elastically abuts against the stop portion 4211 and the bottom wall of the corresponding slot 122. The driving structure 50 includes a first cylindrical segment 51 and a second cylindrical segment 53 arranged and connected sequentially along the second direction. The first cylindrical segment 51 and the second cylindrical segment 53 are coaxially arranged, and the diameter of the first cylindrical segment 51 is larger than the diameter of the second cylindrical segment 53. When the limiting structure 42 is in the locked state, the bottom of the limiting rod 421 abuts against the outer peripheral surface of the first cylindrical segment 51. When the limiting structure 42 is in the unlocked state, the bottom of the limiting rod 421 abuts against the outer peripheral surface of the second cylindrical segment 53.

[0059] In this embodiment, the first elastic element 422 is sleeved on the limiting rod 421. When the limiting structure 42 is in the locked state, the top end of the first elastic element 422 abuts against the bottom wall of the corresponding slot 122, and the bottom end of the first elastic element 422 abuts against the stop part 4211. By rotating the driving structure 50, the driving structure 50 can reciprocate in the mounting cavity 411 along the second direction. In the initial state, the bottom end of the limiting rod 421 abuts against the outer peripheral surface of the second cylindrical section 53. When it is necessary to lock the limiting structure 42, the driving structure 50 is rotated, so that the driving structure 50 moves in the mounting cavity 411 along the second direction toward the conical protrusion 43 until the bottom end of the limiting rod 421 abuts against the outer peripheral surface of the first cylindrical section 51. At this time, the limiting rod 421 is inserted into the corresponding slot 122.

[0060] When it is necessary to put the limiting structure 42 in the unlocked state, the drive structure 50 is rotated in the opposite direction, so that the drive structure 50 moves in the mounting cavity 411 along the second direction away from the conical protrusion 43 until the bottom of the limiting rod 421 abuts against the outer peripheral surface of the second cylindrical section 53. At this time, the limiting rod 421 is dislodged from the corresponding slot 122.

[0061] See also Figures 1 to 15 As shown, in one embodiment of the present invention, there are multiple limiting rods 421 and slots 122. The multiple slots 122 are evenly spaced along the circumference of the base 12. The evenly distributed slots 122 are used to cooperate with the limiting rods 421 to achieve secondary locking between the base 12 and the adapter structure 40. Through the above arrangement, the stability of the anti-rotation engagement can be improved.

[0062] In one embodiment, the number of slots 122 is 12.

[0063] See also Figures 1 to 15As shown, in one embodiment of the present invention, a first annular protrusion 52 is provided at one end where the first cylindrical segment 51 connects to the second cylindrical segment 53. The first annular protrusion 52 includes a receiving cavity and a first conical segment 521. The cross-sectional area of ​​the first conical segment 521 gradually decreases along the direction close to the second cylindrical segment 53. A second annular protrusion 56 is slidably provided on the first cylindrical segment 51. The second annular protrusion 56 includes a second conical segment 561 and a third conical segment 562. The cross-sectional area of ​​the second conical segment 561 gradually increases along the direction close to the second cylindrical segment 53. The cross-sectional area of ​​segment 2 gradually decreases along the direction close to the second cylindrical segment 53. The second tapered segment 561 and the third tapered segment 562 are connected at their respective ends to form a first tip. When the limiting structure 42 is in the locked state, the first annular protrusion 52 can form a stop and limit the bottom of the limiting rod 421 in the second direction. The receiving cavity can accommodate the third tapered segment 562. When the third tapered segment 562 is located in the receiving cavity, the end of the second tapered segment 561 close to the second cylindrical segment 53 and the end of the first annular protrusion 52 away from the second cylindrical segment 53 form a second tip.

[0064] In this embodiment, the outer diameter of the end of the first conical segment 521 away from the second cylindrical segment 53 is larger than the diameter of the first cylindrical segment 51. When it is necessary to lock the limiting structure 42, the drive structure 50 is rotated to move within the mounting cavity 411 in the second direction toward the conical protrusion 43. As the drive structure 50 moves, the first conical segment 521 lifts the limiting rod 421. At this time, the limiting rod 421 moves along the outer circumferential surface of the first conical segment 521, and the first elastic member 422 is compressed. As the drive structure 50 continues to move in the second direction toward the conical protrusion 43, the limiting rod 421 falls onto the first cylindrical segment 51 and is located between the second annular protrusion 56 and the first annular protrusion 52. Under the elastic restoring force of the first elastic member 422, it can maintain contact with the outer circumferential surface of the first cylindrical segment 51, and the limiting rod 421 is inserted into the corresponding slot 122.

[0065] A stop protrusion 57 is provided at the end of the first cylindrical segment 51 away from the second cylindrical segment 53. When it is necessary to unlock the limiting structure 42, the drive structure 50 is rotated, causing the drive structure 50 to continue moving in the second direction toward the conical protrusion 43. As the drive structure 50 moves, the bottom of the limiting rod 421 pushes the second annular protrusion 56 away from the second cylindrical segment 53 until the second annular protrusion 56 abuts against the stop protrusion 57. The drive structure 50 is then rotated again, and the bottom of the limiting rod 421 moves upward along the third conical segment 562. As the drive structure 50 continues to move in the second direction toward the conical protrusion 43, the bottom of the limiting rod 421 gradually moves onto the second conical segment 561. Then, the drive structure 50 is rotated in the opposite direction, causing the drive structure 50 to move in the second direction away from the conical protrusion 43. At this time, the limiting rod 421 pushes the second annular protrusion 56 in the second direction toward the first annular protrusion 52. The second annular protrusion 56 moves until the third conical segment 562 of the second annular protrusion 56 enters the receiving cavity. At this time, the second annular protrusion 56 can no longer move towards the first annular protrusion 52. The end of the second conical segment 561 near the second cylindrical segment 53 and the end of the first annular protrusion 52 away from the second cylindrical segment 53 form a second tip. The drive structure 50 continues to rotate, causing the drive structure 50 to continue moving away from the conical protrusion 43 along the second direction. At this time, the bottom of the limiting rod 421 moves upward along the second conical segment 561 to the top of the second tip. At this time, the first elastic member 422 is compressed. As the drive structure 50 continues to move away from the conical protrusion 43 along the second direction, the bottom of the limiting rod 421 moves downward along the first conical segment 521 until it moves to the second cylindrical segment 53. Under the elastic recovery force of the first elastic member 422, it can maintain contact with the outer circumferential surface of the second cylindrical segment 53. The limiting rod 421 is dislodged from the corresponding slot 122.

[0066] In one embodiment, the first elastic element 422 is a compression spring.

[0067] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the femoral head replacement prosthesis assembly further includes a patch 60, which is mounted on the bottom of the adapter structure 40 and is movable relative to the adapter structure 40 along the circumference of the adapter structure 40.

[0068] In this embodiment, if the necrotic area is found to be too large during the operation and further filling is required, the necrotic area can be filled by implanting a patch 60. The patch 60 is installed at the bottom of the adapter structure 40 and moves circumferentially relative to the adapter structure 40, allowing the surgeon to fine-tune the implantation position during the operation. This allows for more precise filling of the internal collapsed area and repair of necrotic tissue.

[0069] It should be noted that the number and shape of the patch 60 can be set according to the actual surgical needs.

[0070] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the femoral head replacement prosthesis assembly further includes at least one locking component 100 located on the movement path of the patch 60. At least one locking component 100 is provided in a one-to-one correspondence with at least one mounting cavity 411. The locking component 100 is installed in the corresponding mounting cavity 411. The locking component 100 has a locking position for locking the patch 60 in the current position and an unlocking position for disengaging from the patch 60.

[0071] In this embodiment, the locking component allows for precise control of the position of the patch 60, ensuring its secure fixation in the appropriate area on the femoral head surface. The locking component simplifies the surgical procedure, avoids the use of additional fixation tools or nails, reduces surgical steps and time, and also lowers the complexity and surgical risks associated with using multiple instruments.

[0072] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the locking assembly 100 includes a locking member 101 and a second elastic member 102. The locking member 101 is located on the moving path of the driving structure 50. The bottom of the adapter structure 40 is provided with an annular groove 44. The mounting cavity 411 communicates with the annular groove 44. The top of the patch 60 is engaged in the annular groove 44. One end of the locking member 101 is fixedly provided with a first stop member 103. A second stop member 412 is fixedly provided in the mounting cavity 411. The second elastic member 102... The second elastic member 102 is sleeved on the outer periphery of the locking member 101. The second elastic member 102 elastically abuts between the first stop member 103 and the second stop member 412. The second stop member 412 is provided with a third through hole 1021. The bottom of the locking member 101 protrudes through the third through hole 1021. When the limiting structure 42 is in the unlocked state, the locking member 101 is disengaged from the corresponding patch 60. When the limiting structure 42 is in the locked state, the bottom of the locking member 101 abuts against the top of the corresponding patch 60.

[0073] In this embodiment, the top of the patch 60 is engaged in the annular groove 44. Under the action of external force, the patch 60 can slide relative to the annular groove 44 along the circumferential direction of the transition structure 40. At least one locking component 100 is provided on the moving path of the patch 60, and the number of locking components 100 is the number of positions where the patch 60 can stop. A first stop 103 is fixedly provided on the outer wall of one end of the locking member 101. The outer edge of the first stop 103 protrudes from the outer edge of the third through hole 1021. A second stop 412 is fixedly provided on the inner wall of the mounting cavity 411. The bottom of the second elastic member 102 elastically abuts against the second stop 412, and the top of the second elastic member 102 elastically abuts against the first stop 103, so that the locking member 101 can be installed in the mounting cavity 411.

[0074] When the limiting structure 42 is in the locked state, the end of the limiting rod 421 near the conical protrusion 43 presses down on the locking member 101, so that the bottom of the locking member 101 abuts against the top of the patch 60, thereby locking the patch 60 in the current position. At this time, the second elastic member 102 is compressed. When the limiting structure 42 is in the unlocked state, the end of the limiting rod 421 near the conical protrusion 43 disengages from the locking member 101. Under the elastic restoring force of the second elastic member 102, the locking member 101 moves away from the patch 60 along the first direction until the bottom of the locking member 101 disengages from the top of the patch 60. At this time, the patch 60 can slide circumferentially relative to the annular groove 44 along the transition structure 40 under the action of external force.

[0075] In one embodiment, the second elastic element 102 is a spring.

[0076] In one embodiment of the present invention, the patch 60 is 3D printed, and the outer surface of the patch 60 is provided with a trabecular mesh structure. The patch 60 can be set to multiple specifications such as different thicknesses (e.g., 5 mm, 10 mm).

[0077] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the femoral head surface replacement prosthesis assembly further includes a connecting structure 70. Along the length direction of the connecting structure 70, the connecting structure 70 includes a first threaded segment 71 and a second threaded segment 72. The first threaded segment 71 is threadedly connected to the adapter structure 40, and the threads of the first threaded segment 71 and the second threaded segment 72 have opposite directions.

[0078] In this embodiment, the bottom of the adapter structure 40 is provided with a threaded hole, and the first threaded segment 71 is threadedly connected to the threaded hole to realize the connection between the adapter structure 40 and the connecting structure 70. The second threaded segment 72 is inserted into the femoral neck medullary cavity. The threads of the first threaded segment 71 and the second threaded segment 72 are opposite to each other, which can prevent the prosthesis from loosening.

[0079] It should be noted that the femoral head surface replacement frame assembly of this application can replace the necrotic area of ​​the femoral head while preserving the non-necrotic cartilage area.

[0080] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the drive structure 50 further includes an operating part 55 and a third threaded section 54. The third threaded section 54 is connected to the end of the second cylindrical section 53 away from the first annular protrusion 52. The third threaded section 54 extends along the second direction. A fourth threaded section 4111 is provided in the mounting cavity 411. The third threaded section 54 and the fourth threaded section 4111 are threadedly engaged. An opening is provided on the side wall of the mounting cavity 411. The operating part 55 corresponds to the opening. Medical personnel can use tools to insert into the mounting cavity 411 through the opening and rotate the drive structure 50 clockwise or counterclockwise.

[0081] In one embodiment of the present invention, the joint portion 10 and the support mesh 30 are integrally formed using cobalt-chromium material through 3D printing. A spherical body 11 of a suitable size can be printed to fit the size of the femoral head collapse area, with the bottom surface of the spherical body 11 being flat. The support mesh 30, by providing this support mesh, can minimize the foreign body sensation caused by the weight of the cobalt-chromium printing process without significantly increasing the weight of the joint portion 10.

[0082] In one embodiment of the present invention, a trabecular mesh structure 80 is provided on the outer surface of the base, which is implanted into the cancellous bone of the femoral head to facilitate bone ingrowth and repair necrotic areas. The protective component 20 is provided to prevent polishing paste from contaminating the inner cavity of the joint portion 10 and the trabecular mesh structure 80 provided on the base 12 when polishing the spherical body 11.

[0083] In one embodiment of the present invention, the joint portion 10 is a hollow structure, which can reduce the weight of the entire prosthesis, and the hollow region forms the inner cavity of the joint portion 10.

[0084] See also Figures 1 to 15 As shown, in one embodiment of the present invention, the connecting structure 70 is a hollow structure, into which bone with blood supply can be implanted. The connecting structure 70 is 3D printed, and its outer surface is provided with a trabecular mesh structure to facilitate bone ingrowth into the cancellous bone of the femoral head to form primary biological fixation. The connecting structure 70 is provided with multiple fourth through holes 73 communicating with its inner cavity, allowing bone to fuse with the cancellous bone through the fourth through holes 73 to form secondary biological fixation.

[0085] It should be noted that the trabecular mesh structure 80 in this application is a trabecular structure made using 3D printing technology. Since 3D printing technology is a common practice for those skilled in the art, it will not be described in detail here.

[0086] See also Figures 1 to 15As shown, in one embodiment of the present invention, the bottom of the limiting rod 421 includes an inclined surface 4212. The inclined surface 4212 can be adapted to the outer peripheral surface of the first conical segment 521 facing the second cylindrical segment 53. When it is necessary to lock the limiting structure 42, the rotating drive structure 50 moves within the mounting cavity 411 in the second direction toward the conical protrusion 43. As the drive structure 50 moves, the inclined surface 4212 of the limiting rod 421 contacts the outer peripheral surface of the first conical segment 521 and moves upward along the outer peripheral surface of the first conical segment 521, causing the first conical segment 521 to lift the limiting rod 421. The inclined surface 4212 increases the contact area between the bottom of the limiting rod 421 and the outer peripheral surface of the first conical segment 521, ensuring the stability of the movement of the limiting rod 421.

[0087] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: A joint portion is provided, comprising a spherical body and a base. The base includes a side wall and a bottom wall. At least two first through holes communicating with the inner cavity are provided on the side wall of the base. The joint portion of this application is manufactured by 3D printing. During the 3D printing process, incompletely cured powder is retained in the inner cavity of the joint portion. At this time, gas (e.g., inert gas or compressed air) can be introduced into the inner cavity through at least one first through hole, allowing the residual powder to be blown out of the inner cavity of the joint portion from the remaining first through holes. This significantly reduces the weight of the joint portion, thereby solving the problem of excessive weight of existing femoral head replacement prostheses, which causes patients to experience a significant foreign body sensation after surgery, and improving patient comfort.

[0088] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0089] 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.

[0090] 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 femoral head surface replacement prosthesis component, characterized in that, include: The joint (10) includes a spherical body (11) and a base (12). The base (12) includes a side wall and a bottom wall. The bottom of the spherical body (11) is connected to the side wall of the base (12). The spherical body (11) and the base (12) together form the inner cavity of the joint (10). At least two first through holes (121) communicating with the inner cavity are provided on the side wall of the base (12). The femoral head surface replacement prosthesis assembly also includes a transition structure (40), the first end of which is connected to the base (12) to form an anti-rotation fit; The adapter structure (40) includes an adapter body (41) and at least one limiting structure (42) mounted on the adapter body (41). A conical groove (123) is provided on the bottom wall of the base (12) and one of the adapter body (41). A conical protrusion (43) that can engage with the conical groove (123) is provided on the bottom wall of the base (12) and the other of the adapter body (41). At least one slot (122) is provided on the bottom wall of the base (12). At least one slot (122) is provided in correspondence with at least one limiting structure (42). The limiting structure (42) has a locked state that engages with the corresponding slot (122) and an unlocked state that disengages from the corresponding slot (122). The limiting structure (42) is movably disposed relative to the adapter body (41) along a first direction to switch between the locked state and the unlocked state. The limiting structure (42) includes a limiting rod (421), and the femoral head surface replacement prosthesis assembly also includes at least one driving structure (50). At least one driving structure (50) is configured in a one-to-one correspondence with at least one limiting rod (421). The adapter body (41) has at least one mounting cavity (411). At least one mounting cavity (411) is configured in a one-to-one correspondence with at least one driving structure (50). The driving structure (50) is rotatably disposed in the corresponding mounting cavity (411), and the driving structure (50) is movably disposed relative to the adapter body (41) in a second direction to drive the corresponding limiting rod (421) to move in the first direction. The femoral head replacement prosthesis assembly also includes a patch (60) which is mounted on the bottom of the adapter structure (40) and is movable relative to the adapter structure (40) along the circumference of the adapter structure (40); The femoral head replacement prosthesis assembly also includes at least one locking component (100) located on the movement path of the patch (60). At least one locking component (100) is provided in correspondence with at least one mounting cavity (411). The locking component (100) is installed in the corresponding mounting cavity (411). The locking component (100) has a locking position for locking the patch (60) in the current position and an unlocking position for disengaging from the patch (60).

2. The femoral head surface replacement prosthesis assembly according to claim 1, characterized in that, The femoral head surface replacement prosthesis assembly also includes a protective component (20). The protective component (20) is provided with at least two second through holes (21). At least two first through holes (121) and at least two second through holes (21) are provided in a one-to-one correspondence. When the spherical body (11) is polished, the protective component (20) is fixedly sleeved on the outer periphery of the base (12), and the protective component (20) completely covers the base (12).

3. The femoral head surface replacement prosthesis assembly according to claim 2, characterized in that, The femoral head surface replacement prosthesis assembly further includes at least two first sealing members (90), each of which is corresponding to at least two first through holes (121), and the first sealing member (90) blocks the corresponding first through hole (121); or, the femoral head surface replacement prosthesis assembly further includes at least two second sealing members, each of which is corresponding to at least two second through holes (21), and when the spherical body (11) is polished, the second sealing member blocks the corresponding second through hole (21) and the first through hole (121) in sequence.

4. The femoral head surface replacement prosthesis assembly according to any one of claims 1 to 3, characterized in that, The femoral head replacement prosthesis assembly also includes a support mesh (30), which is disposed within the cavity, and the outer peripheral surface of the support mesh (30) is connected to the inner wall surface of the cavity.

5. The femoral head surface replacement prosthesis assembly according to claim 1, characterized in that, The limiting structure (42) further includes a first elastic element (422), and each limiting rod (421) is fitted with a first elastic element (422). The limiting rod (421) is provided with a stop (4211). When the limiting structure (42) is in the locked state, the first elastic element (422) elastically abuts against the stop (4211) and the bottom wall of the corresponding slot (122). The driving structure (50) includes first cylindrical segments arranged and connected sequentially along the second direction. (51) and the second cylindrical segment (53), the first cylindrical segment (51) and the second cylindrical segment (53) are coaxially arranged, and the diameter of the first cylindrical segment (51) is larger than the diameter of the second cylindrical segment (53). When the limiting structure (42) is in the locked state, the bottom of the limiting rod (421) abuts against the outer circumferential surface of the first cylindrical segment (51). When the limiting structure (42) is in the unlocked state, the bottom of the limiting rod (421) abuts against the outer circumferential surface of the second cylindrical segment (53).

6. The femoral head surface replacement prosthesis assembly according to claim 5, characterized in that, A first annular protrusion (52) is provided at one end where the first cylindrical segment (51) connects to the second cylindrical segment (53). The first annular protrusion (52) includes a receiving cavity and a first conical segment (521). The cross-sectional area of ​​the first conical segment (521) gradually decreases along the direction close to the second cylindrical segment (53). A second annular protrusion (56) is slidably provided on the first cylindrical segment (51). The second annular protrusion (56) includes a second conical segment (561) and a third conical segment (562). The cross-sectional area of ​​the second conical segment (561) gradually increases along the direction close to the second cylindrical segment (53), and the cross-sectional area of ​​the third conical segment (562) gradually increases along the direction close to the second cylindrical segment (53). The direction of the second cylindrical segment (53) gradually decreases, and the second conical segment (561) and the third conical segment (562) are connected at their respective ends to form a first tip. When the limiting structure (42) is in the locked state, the first annular protrusion (52) can form a stop limit on the bottom of the limiting rod (421) in the second direction. The receiving cavity can accommodate the third conical segment (562), and when the third conical segment (562) is located in the receiving cavity, the end of the second conical segment (561) near the second cylindrical segment (53) and the end of the first annular protrusion (52) away from the second cylindrical segment (53) form a second tip.

7. The femoral head surface replacement prosthesis assembly according to claim 1, characterized in that, The locking assembly (100) includes a locking member (101) and a second elastic member (102). The locking member (101) is located on the moving path of the driving structure (50). The bottom of the adapter structure (40) is provided with an annular groove (44). The mounting cavity (411) communicates with the annular groove (44). The top of the patch block (60) is engaged in the annular groove (44). One end of the locking member (101) is fixedly provided with a first stop (103). The mounting cavity (411) is fixedly provided with a second stop (412). The second elastic member (102) is sleeved on the drive structure (50). The second elastic member (102) elastically abuts against the first stop member (103) and the second stop member (412) on the outer periphery of the locking member (101). The second stop member (412) is provided with a third through hole (1021). The bottom of the locking member (101) protrudes from the third through hole (1021). When the limiting structure (42) is in the unlocked state, the locking member (101) disengages from the corresponding patch (60). When the limiting structure (42) is in the locked state, the bottom of the locking member (101) abuts against the top of the corresponding patch (60).

8. The femoral head surface replacement prosthesis assembly according to claim 1, characterized in that, The femoral head replacement prosthesis assembly also includes a connecting structure (70). Along the length of the connecting structure (70), the connecting structure (70) includes a first threaded segment (71) and a second threaded segment (72). The first threaded segment (71) is threadedly connected to the adapter structure (40), and the threads of the first threaded segment (71) and the second threaded segment (72) are opposite in direction.

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