Epiphyseal prosthesis

Abstract

The application provides a metaphyseal prosthesis, comprising: a main body part; a connecting part arranged at one end of the main body part and capable of moving along the axial direction of the main body part; and an adjusting structure, the adjusting structure comprising an adjusting rod and an adjusting ring, the adjusting rod being arranged on the main body part, and the adjusting ring being rotatably arranged on the adjusting rod and capable of moving relative to the adjusting rod when the adjusting ring rotates to drive the connecting part to move, so as to adjust the distance between the main body part and the connecting part. The technical scheme of the application effectively solves the problem in the prior art that the metaphyseal prosthesis is difficult to adjust the length, thereby resulting in poor universality.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a metaphyseal prosthesis. Background Technology

[0002] Bone defects resulting from extensive resection of bones due to osteomyelitis or malignant bone tumors require reconstruction. Currently, commonly used clinical reconstruction methods include autologous bone grafting, allogeneic bone grafting, and the Ilizarov distraction osteogenesis technique. While autologous bone grafting offers good biocompatibility, it is limited by insufficient donor bone volume and secondary trauma. Allogeneic bone grafting, although widely available, carries risks of weak osteogenic capacity, immune rejection, and infection transmission. The Ilizarov technique, while inducing new bone formation, has a treatment cycle lasting several months and is prone to complications such as pin tract infection, pain, and slow functional recovery, leading to poor patient compliance. Therefore, prostheses have become the mainstream reconstruction method due to their ability to enable early weight-bearing and rapid restoration of limb function.

[0003] In existing technologies, most artificial prostheses are designed with a fixed length and are suitable for reconstruction of bone shaft defects. Metaphyseal prostheses typically employ a one-piece lateral wing structure, requiring the entire prosthesis to be inserted at once after osteotomy. Due to irregular bone end morphology, narrow medullary cavity space, or soft tissue tension limitations, implantation is often difficult and misalignment occurs, increasing surgical time and the risk of complications. Furthermore, traditional prostheses have a single screw hole structure, supporting only either compression screws or locking screws, making it impossible to flexibly choose the fixation method based on the patient's bone condition (e.g., osteoporosis or sufficient bone mass), thus limiting the optimization of mechanical stability. While some prostheses possess metaphyseal fixation capabilities, they lack anchoring structures for soft tissues (such as knee ligaments and tendons), making postoperative functional reconstruction difficult and affecting joint stability and range of motion. Furthermore, the length of osteotomy during surgery often deviates by millimeters due to tumor boundary judgment, bone fragility, or imaging errors. Since the length of existing prostheses is not adjustable and cannot be adapted through fine-tuning, the prosthesis is often too long or too short, forcing the surgeon to change the prosthesis model or use bone cement filling, which increases the complexity of the surgery and the risk of failure. Summary of the Invention

[0004] The main objective of this invention is to provide a metaphyseal prosthesis that solves the problem of poor versatility caused by the difficulty in length adjustment of metaphyseal prostheses in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a metaphyseal prosthesis is provided, comprising: a main body; a connecting portion disposed at one end of the main body and movable along the axial direction of the main body; and an adjustment structure comprising an adjustment rod and an adjustment ring, the adjustment rod being disposed on the main body and the adjustment ring being rotatably disposed on the adjustment rod, the adjustment ring being movable relative to the adjustment rod when rotated, thereby driving the connecting portion to move, thereby adjusting the distance between the main body and the connecting portion.

[0006] Furthermore, the connecting part includes a connecting cylinder, an opening is provided on the side wall of the connecting cylinder, an adjusting ring is inserted into the connecting cylinder through the opening, the end face of the adjusting ring is limited and matched with the top and bottom walls of the opening, and an adjusting rod is inserted into the connecting cylinder and into the adjusting ring.

[0007] Furthermore, a receiving groove is provided on the inner wall of the connecting cylinder, the receiving groove is connected to the opening, part of the structure of the adjusting ring is located in the receiving groove, and / or, an internal thread is provided on the inner wall of the adjusting ring, and an external thread that mates with the internal thread is provided on the outer wall of the adjusting rod.

[0008] Furthermore, the metaphyseal prosthesis also includes a guide structure, which is located between the connecting cylinder and the adjusting rod. The guide structure can prevent the adjusting rod from rotating when the adjusting ring rotates.

[0009] Furthermore, the end of the adjusting ring is provided with an operating tooth.

[0010] Furthermore, the metaphyseal prosthesis also includes a locking element. The side wall of the connecting tube is provided with a mounting hole located above the adjusting ring. The locking element can be inserted into the mounting hole and cooperate with the operating tooth stop.

[0011] Furthermore, the locking component includes a screw and a limiting post, the mounting hole is a threaded hole, the screw is connected in the threaded hole, and the limiting post cooperates with the operating tooth stop.

[0012] Furthermore, the connecting part also includes an end piece, which is connected to the end of the connecting cylinder away from the main body; the end piece is provided with a fixed side wing and a detachable side wing on the side away from the connecting cylinder, and the detachable side wing is detachably connected to the end piece.

[0013] Furthermore, the main body includes a rod body and a connecting plate. The rod body includes a first rod segment and a second rod segment. The diameter of the first rod segment is larger than the diameter of the second rod segment. The first rod segment is located between the connecting part and the second rod segment. The connecting plate is located on the outside of the rod body and the top of the connecting plate is connected to the first rod segment.

[0014] Furthermore, the connecting plate is provided with a plurality of first connecting holes at intervals, the second rod segment is provided with a plurality of second connecting holes, the metaphyseal prosthesis also includes a plurality of connecting screws, the plurality of first connecting holes and the plurality of second connecting holes are provided in a one-to-one correspondence, the plurality of connecting screws and the plurality of first connecting holes are provided in a one-to-one correspondence, and each connecting screw is inserted into the corresponding first connecting hole and second connecting hole.

[0015] Furthermore, each first connecting hole includes a first hole portion and a second hole portion, the inner diameter of the first hole portion is larger than the inner diameter of the second hole portion, and the second connecting hole is a strip-shaped hole, the length direction of the strip-shaped hole is parallel to the axial direction of the rod portion.

[0016] Furthermore, the connecting plate has multiple clearance recesses on the side facing the main body, and at least one clearance recess is provided between two adjacent first connecting holes; and / or, the metaphyseal prosthesis also includes a gasket, which is fitted onto the second rod segment and abuts against the first rod segment.

[0017] The technical solution of this invention includes a connecting part located at one end of the main body, which is movable along the axial direction of the main body. The adjustment structure includes an adjusting rod and an adjusting ring. The adjusting rod is mounted on the main body, and the adjusting ring is rotatably mounted on the adjusting rod. When the adjusting ring rotates, it moves relative to the adjusting rod, causing the connecting part to move and thus adjusting the distance between the main body and the connecting part. With this configuration, when it is necessary to adjust the distance between the connecting part and the main body, the adjusting ring is driven to rotate, causing it to move relative to the adjusting rod and thus adjusting the distance between the connecting part and the main body. This allows the metaphyseal prosthesis to be adapted to different patients. Therefore, the technical solution of this application effectively solves the problem in related technologies where the length of the metaphyseal prosthesis is difficult to adjust, resulting in poor versatility. 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 an embodiment of the metaphyseal prosthesis according to the present invention is shown;

[0020] Figure 2 It shows Figure 1 A three-dimensional structural diagram of the metaphyseal prosthesis from another perspective;

[0021] Figure 3 It shows Figure 1 A schematic diagram of the exploded structure of a metaphyseal prosthesis;

[0022] Figure 4 It shows Figure 1 A three-dimensional structural diagram of the rod portion of the metaphyseal prosthesis;

[0023] Figure 5 It shows Figure 1 A three-dimensional structural diagram of the adjustment ring of the metaphyseal prosthesis;

[0024] Figure 6 It shows Figure 1 A three-dimensional structural diagram of the locking mechanism of the epiphyseal prosthesis;

[0025] Figure 7 It shows Figure 1A three-dimensional structural diagram of the connecting plate of the epiphyseal prosthesis;

[0026] Figure 8 It shows Figure 7 A three-dimensional structural diagram of the connecting plate from another perspective;

[0027] Figure 9 It shows Figure 1 A three-dimensional structural diagram of the connecting tube of the metaphyseal prosthesis;

[0028] Figure 10 It shows Figure 9 A three-dimensional structural diagram of the connecting cylinder from another perspective;

[0029] Figure 11 It shows Figure 9 A cross-sectional view of the connecting cylinder;

[0030] Figure 12 It shows Figure 1 A three-dimensional structural diagram of the end piece of the epiphyseal prosthesis;

[0031] Figure 13 It shows Figure 12 A three-dimensional structural diagram of the end piece from another perspective;

[0032] Figure 14 It shows Figure 1 A three-dimensional structural diagram of the detachable side wings of the metaphyseal prosthesis;

[0033] Figure 15 It shows Figure 14 A three-dimensional structural diagram of the detachable side wings from another perspective;

[0034] Figure 16 It shows Figure 1 A three-dimensional structural diagram of the pad of the epiphyseal prosthesis.

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

[0036] 10. Main body; 11. Rod body; 111. First rod segment; 112. Second rod segment; 1121. Second connecting hole; 12. Connecting plate; 121. First connecting hole; 1211. First hole; 1212. Second hole; 122. Clearance recess; 20. Connecting part; 21. Connecting cylinder; 211. Opening; 212. Receiving groove; 213. Mounting hole; 22. End piece; 221. Fixed side wing; 222. Detachable side wing; 30. Adjustment structure; 31. Adjustment rod; 32. Adjustment ring; 321. Operating tooth; 40. Guide structure; 50. Locking part; 51. Screw; 52. Limiting post; 60. Connecting screw; 70. Washer. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] like Figures 1 to 3 As shown, in some embodiments, the metaphyseal prosthesis includes a main body 10, a connecting portion 20, and an adjustment structure 30. The connecting portion 20 is disposed at one end of the main body 10 and is movable along the axial direction of the main body 10. The adjustment structure 30 includes an adjustment rod 31 and an adjustment ring 32. The adjustment rod 31 is disposed on the main body 10, and the adjustment ring 32 is rotatably disposed on the adjustment rod 31. When the adjustment ring 32 rotates, it can move relative to the adjustment rod 31 to drive the connecting portion 20 to move, thereby adjusting the distance between the main body 10 and the connecting portion 20.

[0041] Using the above technical solution, the connecting part 20 is located at one end of the main body 10, and the connecting part 20 can move along the axis of the main body 10. The adjustment structure 30 includes an adjustment rod 31 and an adjustment ring 32. The adjustment rod 31 is located on the main body 10, and the adjustment ring 32 is rotatably located on the adjustment rod 31. When the adjustment ring 32 rotates, it can move relative to the adjustment rod 31. When the adjustment ring 32 moves relative to the adjustment rod 31, it can drive the connecting part 20 to move, thereby adjusting the distance between the main body 10 and the connecting part 20. With the above arrangement, when it is necessary to adjust the distance between the connecting part 20 and the main body 10, the adjustment ring 32 is driven to rotate, thereby causing the adjustment ring 32 to move relative to the adjustment rod 31, and thus adjusting the distance between the connecting part 20 and the main body 10. This allows the metaphyseal prosthesis to be adapted to different patients. Therefore, the above technical solution effectively solves the problem in related technologies where the length of the metaphyseal prosthesis is difficult to adjust, resulting in poor versatility.

[0042] Specifically, when the adjusting ring 32 rotates relative to the adjusting rod 31, its internal threaded structure and guide structure cooperate, driving the adjusting ring 32 to displace along the axial direction of the adjusting rod 31. This displacement is transmitted to the connecting part 20, thereby causing the connecting part 20 to move synchronously along the axis of the main body 10, thus adjusting the distance between the main body 10 and the connecting part 20. This structure allows for real-time adjustment of the prosthesis length during surgery according to the patient's bone matching needs without replacing the prosthesis or using external tools. It directly overcomes the technical defects of traditional prostheses, which require repeated trial fittings during surgery due to their fixed preset length, prolonging the operation time and even affecting the repositioning accuracy. This significantly improves the flexibility and precision of intraoperative fitting of metaphyseal prostheses.

[0043] like Figures 1 to 5 as well as Figures 9 to 11As shown, in some embodiments, the connecting part 20 includes a connecting cylinder 21, and an opening 211 is provided on the side wall of the connecting cylinder 21. The adjusting ring 32 is inserted into the connecting cylinder 21 through the opening 211. The end face of the adjusting ring 32 is limited and matched with the top wall and bottom wall of the opening 211. The adjusting rod 31 is inserted into the connecting cylinder 21 and into the adjusting ring 32. The above-mentioned configuration allows the adjusting ring 32 to be confined within the internal space of the connecting cylinder 21 along the axial direction of the adjusting rod 31. At the same time, the end face of the adjusting ring 32 forms a limiting fit with the top and bottom walls of the opening 211, effectively preventing the adjusting ring 32 from axially shifting or deflecting during rotation. This ensures that the adjusting ring 32 can only produce linear displacement along the axial direction of the adjusting rod 31, and will not rotate around its own axis or deviate from the predetermined trajectory. The adjusting rod 31 is inserted into the connecting cylinder 21 and passes through the adjusting ring 32, so that the threaded fit between the adjusting ring 32 and the adjusting rod 31 can stably transmit axial force, thereby converting the rotational motion of the adjusting ring 32 into linear movement of the connecting cylinder 21 along the axial direction of the main body 10, realizing stable adjustment of the prosthesis length and avoiding assembly deviations caused by structural loosening or uneven force.

[0044] Specifically, the side wall of the connecting cylinder 21 is provided with a first through groove and a second through groove, which are spaced apart circumferentially along the connecting cylinder 21. The length of the first through groove is greater than the length of the second through groove, that is, in the cross-section of the connecting cylinder 21, the central angles at both ends of the first through groove are greater than the central angles at both ends of the second through groove. The arrangement of the first and second through grooves can provide a certain degree of buffering, thus ensuring that the connecting cylinder 21 has a certain strength and can achieve a certain degree of deformation buffering. On the other hand, the arrangement of the first and second through grooves allows for observation of the adjusting rod 31.

[0045] like Figures 1 to 5 as well as Figures 9 to 11 As shown, in some embodiments, a receiving groove 212 is provided on the inner wall of the connecting cylinder 21, which communicates with the opening 211. Part of the structure of the adjusting ring 32 is located in the receiving groove 212. An internal thread is provided on the inner wall of the adjusting ring 32, and an external thread that mates with the internal thread is provided on the outer wall of the adjusting rod 31. The above design ensures that when the adjusting ring 32 moves axially along the adjusting rod 31, its end face is always limited and constrained by the top and bottom walls of the opening 211, effectively preventing the adjusting ring 32 from radially offset or circumferentially stuck during rotation, and ensuring its stable movement trajectory. At the same time, the internal thread on the inner wall of the adjusting ring 32 and the external thread that mates with the internal thread on the outer wall of the adjusting rod 31 enable the adjusting ring 32 to convert rotational motion into axial linear displacement through thread transmission when rotating relative to the adjusting rod 31, thereby driving the connecting cylinder 21 to slide smoothly along the axial direction of the main body 10, realizing the adjustment of the prosthesis length, and avoiding displacement deviation caused by friction loosening or gap accumulation in traditional limiting structures.

[0046] like Figures 1 to 5 as well as Figures 9 to 11 As shown, in some embodiments, the metaphyseal prosthesis also includes a guide structure 40, which is disposed between the connecting cylinder 21 and the adjusting rod 31. The guide structure 40 can stop the adjusting rod 31 from rotating when the adjusting ring 32 rotates. When the adjusting ring 32 rotates, the guide structure 40, disposed between the connecting cylinder 21 and the adjusting rod 31, constrains the adjusting rod 31 from rotating with the adjusting ring 32, keeping the adjusting rod 31 axially stationary and allowing only the adjusting ring 32 to achieve axial displacement on the adjusting rod 31. The adjusting ring 32 is inserted into the connecting cylinder 21 through the opening 211, and its end face forms a limiting fit with the top and bottom walls of the opening 211, thereby directly transmitting the axial movement of the adjusting ring 32 to the connecting cylinder 21, driving the connecting part 20 to move along the axial direction of the main body 10, and realizing the stable adjustment of the distance between the main body 10 and the connecting part 20.

[0047] Specifically, the guide structure 40 includes a guide groove and a guide block. A through hole is also provided on the side wall of the connecting cylinder 21. The guide block is inserted into the through hole. The guide groove is provided on the adjusting rod 31 and extends along the axial direction of the adjusting rod 31. The guide block is inserted into the guide groove. Under the action of the guide groove and the guide block, the relative rotation between the main body 10 and the connecting part 20 can be restricted.

[0048] The adjusting rod 31 has a hollow interior, and the guide groove is connected to the hollow interior. The interior of the hollow interior can be filled with bone ingrowth structures, thereby enabling biological fixation.

[0049] like Figures 1 to 5 as well as Figures 9 to 11 As shown, in some embodiments, the end of the adjusting ring 32 is provided with an operating tooth 321. When an external force is applied to the operating tooth 321, the operating tooth 321 directly transmits torque to the adjusting ring 32, driving the adjusting ring 32 to rotate around the adjusting rod 31. Since the adjusting ring 32 and the adjusting rod 31 achieve rotational conversion into axial displacement through a threaded or inclined structure, the rotation of the adjusting ring 32 further drives the connecting part 20 to move along the axial direction of the main body 10, thereby adjusting the distance between the main body 10 and the connecting part 20.

[0050] Specifically, the operating tooth 321 and the adjusting ring 32 are integrally formed, enabling stable and reliable force transmission without the need for external tools. In this embodiment, an operating rod is also included. The operating rod can be inserted into the opening 211 and can cooperate with the operating tooth 321. When the operating rod rotates, it can drive the operating tooth 321 to move, thereby causing the adjusting ring 32 to rotate.

[0051] There are multiple operating protrusions 321, which are arranged sequentially along the circumference of the adjusting ring 32.

[0052] like Figures 1 to 6 as well as Figures 9 to 11 As shown, in some embodiments, the metaphyseal prosthesis also includes a locking member 50. A mounting hole 213 is provided on the side wall of the connecting cylinder 21 and is located above the adjusting ring 32. The locking member 50 can be inserted into the mounting hole 213 and engage with the operating protrusion 321. When the adjusting ring 32 is rotated axially relative to the adjusting rod 31 to adjust the distance between the main body 10 and the connecting part 20 to the target position, the locking member 50 is inserted into the mounting hole 213, causing the locking member 50 to engage with the operating protrusion 321, thereby effectively preventing the adjusting ring 32 from rotating under external force or vibration, ensuring that the relative position of the connecting part 20 and the main body 10 remains stable.

[0053] The tooth structure of the operating tooth 321 is adapted to the end shape of the locking member 50, so that the locking member 50 can be engaged in the tooth groove of the operating tooth 321 after being inserted into the mounting hole 213, thereby achieving one-way locking, preventing the adjusting ring 32 from rotating in the opposite direction, and improving the stability of the prosthesis in the in vivo environment. At the same time, the mounting hole 213 is located above the adjusting ring 32, which does not interfere with the normal rotation path of the adjusting ring 32, and facilitates the quick insertion of the locking member 50 by external tools to complete the locking operation, thereby improving the convenience and safety of adjustment.

[0054] like Figures 1 to 5 as well as Figures 9 to 11 As shown, in some embodiments, the locking member 50 includes a screw 51 and a limiting post 52. The mounting hole 213 is a threaded hole, and the screw 51 is connected in the threaded hole. The limiting post 52 is in stop engagement with the operating protrusion 321. The screw 51 is screwed into the mounting hole 213 through the threaded engagement and fixed to the connecting cylinder 21. The limiting post 52 and the operating protrusion 321 at the end of the adjusting ring 32 form a stop engagement. When the adjusting ring 32 moves to the target position by rotating along the adjusting rod 31 to adjust the distance between the connecting part 20 and the main body 10, the screw 51 is tightened so that the limiting post 52 abuts against the operating protrusion 321, thereby restricting the reverse rotation of the adjusting ring 32. This effectively prevents the adjusting ring 32 from rotating due to vibration or external force, ensuring that the relative position of the connecting part 20 and the main body 10 remains stable and improving the reliability of the prosthesis after adjustment.

[0055] like Figures 1 to 3 as well as Figures 12 to 15As shown, in some embodiments, the connecting part 20 further includes an end piece 22, which is connected to the end of the connecting cylinder 21 away from the main body 10; the end piece 22 is provided with a fixed side wing 221 and a detachable side wing 222 on the side away from the connecting cylinder 21, and the detachable side wing 222 is detachably connected to the end piece 22. The detachable side wing 222 is detachably connected to the end piece 22, allowing the main body 10 and the connecting tube 21 to be adjusted to a preset axial distance via the adjustment structure 30 during operation. After the connecting tube 21 is accurately positioned on the metaphysis bone surface, the detachable side wing 222 is then installed onto the end piece 22. This avoids the problems of limited implantation channels and insufficient operating space caused by the excessively large overall size of traditional one-piece molded side wings. The fixed side wing 221 is integrally molded with the end piece 22, providing basic stable support. The step-by-step installation of the detachable side wing 222 significantly reduces the operational difficulty and risk of bone surface damage during prosthesis implantation, improving the adaptability and installation efficiency of the sensory segment prosthesis.

[0056] like Figures 9 to 13 As shown, an insertion structure is provided between the end piece 22 and the connecting cylinder 21. The insertion structure includes an insertion post and an insertion hole. The insertion post is located at the end of the connecting cylinder 21 facing the end piece 22, and the insertion hole is located at the end of the end piece 22 facing the connecting cylinder 21. The insertion post and the insertion hole are interference-fitted.

[0057] The end piece 22 also includes a first limiting plate and a second limiting plate, both of which are disposed at the end of the end piece 22 facing the connecting cylinder 21. The first and second limiting plates are spaced apart and located on the side of the insertion hole. A first mating surface and a second mating surface are provided on the side wall of the connecting cylinder 21. The first mating surface is fitted with the first limiting plate, and the second mating surface is fitted with the second limiting plate. A groove is provided on the side of the first limiting plate facing the second limiting plate, and a second groove is provided on the side of the second limiting plate facing the first limiting plate. A first protrusion is provided on the first mating surface, and a second protrusion is provided on the second mating surface. The first protrusion can be inserted into the first groove, and the second protrusion can be inserted into the second groove. Both the first and second grooves extend along the circumferential direction of the connecting cylinder 21.

[0058] like Figures 1 to 4 as well as Figure 7 and Figure 8As shown, in some embodiments, the main body 10 includes a rod portion 11 and a connecting plate 12. The rod portion 11 includes a first rod segment 111 and a second rod segment 112. The diameter of the first rod segment 111 is larger than the diameter of the second rod segment 112. The first rod segment 111 is located between the connecting portion 20 and the second rod segment 112. The connecting plate 12 is located outside the rod portion 11, and the top of the connecting plate 12 is connected to the first rod segment 111. The first rod segment 111 and the second rod segment 112 form an axial limiting step, allowing the second rod segment 112 to be inserted into the medullary cavity. The second rod segment 112 abuts against the end face of the bone. The connecting plate 12 is located on the outer side of the rod body 11 and is directly connected to the top of the first rod segment 111. This allows the connecting plate 12 to conform to the outer bone surface of the bone shaft after the prosthesis is implanted. This effectively enhances the bending stiffness and stability of the main body 10 within the medullary cavity. At the same time, when the adjusting structure 30 moves the connecting part 20 along the axis, the synergistic effect of the connecting plate 12 and the first rod segment 111 can suppress the deflection and buckling of the slender main body 10 due to uneven force. Thus, while achieving flexible length adjustment, it ensures the axial positioning accuracy and mechanical support performance of the prosthesis after installation within the medullary cavity.

[0059] like Figures 1 to 4 as well as Figure 7 and Figure 8 As shown, in some embodiments, the connecting plate 12 is provided with a plurality of first connecting holes 121 at intervals, the second rod segment 112 is provided with a plurality of second connecting holes 1121, and the metaphyseal prosthesis also includes a plurality of connecting screws 60. The plurality of first connecting holes 121 and the plurality of second connecting holes 1121 are provided in a one-to-one correspondence, and the plurality of connecting screws 60 and the plurality of first connecting holes 121 are provided in a one-to-one correspondence. Each connecting screw 60 is inserted into the corresponding first connecting hole 121 and second connecting hole 1121. Multiple connecting screws 60 can pass through the first connecting hole 121 and be screwed into the corresponding second connecting hole 1121, thereby achieving a rigid fixed connection between the connecting plate 12 and the second rod segment 112. Since the connecting plate 12 is located on the outside of the rod body 11 and connected to the first rod segment 111, this structure allows the connecting screws 60 to be simultaneously anchored between the outer structure of the prosthesis body 10 and the bone during the insertion process, forming a stable load-bearing body composed of the connecting plate 12, the second rod segment 112, and the bone tissue. After the adjustment structure 30 completes the adjustment of the distance between the connecting part 20 and the body 10, this multi-point through-connection method effectively disperses the axial load and shear force, avoiding the stress concentration and micro-movement loosening problems caused by traditional single medullary canal insertion or conical fit fixation, improving the long-term stability and biomechanical adaptability of the prosthesis under dynamic load, and ensuring the reliability of postoperative functional recovery.

[0060] like Figures 1 to 4 as well as Figure 7 and Figure 8As shown, in some embodiments, each first connecting hole 121 includes a first hole portion 1211 and a second hole portion 1212. The inner diameter of the first hole portion 1211 is larger than the inner diameter of the second hole portion 1212. The second connecting hole 12121 is a strip-shaped hole, and the length direction of the strip-shaped hole is parallel to the axial direction of the rod portion 11. The above-described configuration allows the first hole portion 1211 and the second hole portion 1212 to accommodate connecting screws 60 of different sizes, thereby further improving the versatility of the metaphyseal prosthesis.

[0061] like Figures 1 to 4 as well as Figure 7 and Figure 8 As shown, in some embodiments, the connecting plate 12 has multiple clearance recesses 122 on the side facing the main body 10, and at least one clearance recess 122 is provided between two adjacent first connecting holes 121; the metaphyseal prosthesis also includes a gasket 70, which is sleeved on the second rod segment 112 and abuts against the first rod segment 111. The connection plate 12 has multiple clearance recesses 122 on the side facing the main body 10, and at least one clearance recess 122 is provided between two adjacent first connecting holes 121. This structure, by locally thinning the material thickness of the connecting plate 12, allows the connecting plate 12 to undergo controllable elastic deformation when the connecting screw 60 is tightened, effectively releasing the axial displacement stress caused by the movement of the adjustment structure 30, reducing stress concentration around the first connecting holes 121, and improving connection reliability. Furthermore, the clearance recesses 122 can be filled with bone structures, thus improving the connection stability between the connecting plate and the bone.

[0062] like Figures 1 to 4 as well as Figure 16 As shown, in some embodiments, the gasket 70 is sleeved on the second rod segment 112 and closely abuts the end face of the first rod segment 111. The gasket 70 can achieve axial compensation and can be stably connected to the skeleton.

[0063] The gasket 70 has a hollow layer inside, which can be filled with medicine. The gasket 70 also has multiple release holes, which connect the hollow layer and the outside of the gasket. The inner diameter of the release hole gradually decreases from the hollow layer to the outside of the gasket.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 metaphyseal prosthesis, characterized in that, include: Main body (10); A connecting part (20) is provided at one end of the main body (10) and is movable along the axial direction of the main body (10); An adjustment structure (30) is provided, which includes an adjustment rod (31) and an adjustment ring (32). The adjustment rod (31) is disposed on the main body (10), and the adjustment ring (32) is rotatably disposed on the adjustment rod (31). When the adjustment ring (32) rotates, it can move relative to the adjustment rod (31) to drive the connecting part (20) to move, thereby adjusting the distance between the main body (10) and the connecting part (20).

2. The metaphyseal prosthesis according to claim 1, characterized in that, The connecting part (20) includes a connecting cylinder (21), and an opening (211) is provided on the side wall of the connecting cylinder (21). The adjusting ring (32) is inserted into the connecting cylinder (21) through the opening (211). The end face of the adjusting ring (32) is limited and matched with the top and bottom walls of the opening (211). The adjusting rod (31) is inserted into the connecting cylinder (21) and into the adjusting ring (32).

3. The metaphyseal prosthesis according to claim 2, characterized in that, The inner wall of the connecting cylinder (21) is provided with a receiving groove (212), the receiving groove (212) is connected to the opening (211), part of the structure of the adjusting ring (32) is located in the receiving groove (212), and / or, the inner wall of the adjusting ring (32) is provided with an internal thread, and the outer wall of the adjusting rod (31) is provided with an external thread that mates with the internal thread.

4. The metaphyseal prosthesis according to claim 2, characterized in that, The metaphyseal prosthesis also includes a guide structure (40), which is disposed between the connecting cylinder (21) and the adjusting rod (31). The guide structure (40) can stop the adjusting rod (31) from rotating when the adjusting ring (32) rotates.

5. The metaphyseal prosthesis according to claim 2, characterized in that, The end of the adjusting ring (32) is provided with an operating tooth (321).

6. The metaphyseal prosthesis according to claim 5, characterized in that, The metaphyseal prosthesis also includes a locking member (50). The side wall of the connecting cylinder (21) is provided with a mounting hole (213) and is located above the adjusting ring (32). The locking member (50) can be inserted into the mounting hole (213) and cooperate with the operating tooth (321) stop.

7. The metaphyseal prosthesis according to claim 6, characterized in that, The locking component (50) includes a screw (51) and a limiting post (52). The mounting hole (213) is a threaded hole. The screw (51) is connected in the threaded hole. The limiting post (52) is engaged with the operating tooth (321) for a stop.

8. The metaphyseal prosthesis according to claim 2, characterized in that, The connecting part (20) further includes an end piece (22), which is connected to one end of the connecting cylinder (21) away from the main body (10); the end piece (22) is provided with a fixed side wing (221) and a detachable side wing (222) on the side away from the connecting cylinder (21), and the detachable side wing (222) is detachably connected to the end piece (22).

9. The metaphyseal prosthesis according to claim 1, characterized in that, The main body (10) includes a rod body (11) and a connecting plate (12). The rod body (11) includes a first rod segment (111) and a second rod segment (112). The diameter of the first rod segment (111) is larger than the diameter of the second rod segment (112). The first rod segment (111) is located between the connecting part (20) and the second rod segment (112). The connecting plate (12) is located outside the rod body (11), and the top of the connecting plate (12) is connected to the first rod segment (111).

10. The metaphyseal prosthesis according to claim 9, characterized in that, The connecting plate (12) is provided with a plurality of first connecting holes (121) spaced apart, and the second rod segment (112) is provided with a plurality of second connecting holes (1121). The metaphyseal prosthesis also includes a plurality of connecting screws (60). The plurality of first connecting holes (121) and the plurality of second connecting holes (1121) are provided in a one-to-one correspondence. The plurality of connecting screws (60) and the plurality of first connecting holes (121) are provided in a one-to-one correspondence. Each connecting screw (60) is inserted into the corresponding first connecting hole (121) and second connecting hole (1121).

11. The metaphyseal prosthesis according to claim 10, characterized in that, Each of the first connecting holes (121) includes a first hole portion (1211) and a second hole portion (1212). The inner diameter of the first hole portion (1211) is larger than the inner diameter of the second hole portion (1212). The second connecting hole (12121) is a strip hole, and the length direction of the strip hole is parallel to the axial direction of the rod body portion (11).

12. The metaphyseal prosthesis according to claim 10, characterized in that, The connecting plate (12) is provided with a plurality of clearance recesses (122) on the side facing the main body (10), and at least one clearance recess (122) is provided between two adjacent first connecting holes (121); and / or, the metaphyseal prosthesis also includes a gasket (70), the gasket (70) is sleeved on the second rod segment (112) and abuts against the first rod segment (111).

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