Sacral prosthesis

Abstract

The application provides a sacrum prosthesis, which comprises a main body part used for connecting with a sacrum or a vertebral body; a first connecting block used for connecting with a first hip bone and arranged apart from the main body part; a second connecting block connected between the main body part and a second hip bone, the second connecting block being adjustably arranged relative to the main body part around a horizontal axis; a fixing part connected between the main body part and the second connecting block; a first rotation-stopping part arranged on the main body part; and a second rotation-stopping part arranged on the second connecting block, the second rotation-stopping part being capable of rotation-stopping cooperation with the first rotation-stopping part. The technical scheme of the application effectively solves the problem that the sacrum prosthesis in the related art is difficult to adapt to different patients.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a sacral prosthesis. BACKGROUND

[0002] Sacral tumors are relatively common diseases among sacral related diseases. Common sacral benign tumors include osteoblastoma, giant cell tumor of bone and aneurysmal bone cyst, and common sacral malignant tumors include chordoma and chondrosarcoma. For patients with sacral tumors, subtotal resection or even total resection of the sacrum is often required, and sometimes part of the ilium needs to be resected to obtain a satisfactory resection margin.

[0003] In the related art, the angle of the pelvis, the shape of the sacrum, etc. of different patients are different. The traditional nail rod plus side connecting block fixation system not only easily causes nail rod breakage and loosening, but also may cause lumbar sinking and pelvis ring separation, i.e. the traditional fixation system is difficult to adapt to different patients. SUMMARY

[0004] The main purpose of the present application is to provide a sacral prosthesis to solve the problem that the sacral prosthesis in the related art is difficult to adapt to different patients.

[0005] In order to achieve the above purpose, according to one aspect of the present application, a sacral prosthesis is provided, comprising: a main body part for connecting with a sacrum or a vertebral body; a first connecting block for connecting with a first ilium and being spaced apart from the main body part; a second connecting block connected between the main body part and a second ilium, the second connecting block being adjustably arranged relative to the main body part about a horizontal axis; a fixing member connected between the main body part and the second connecting block; a first rotation stopping part arranged on the main body part; a second rotation stopping part arranged on the second connecting block, the second rotation stopping part being capable of rotationally cooperating with the first rotation stopping part.

[0006] Further, the first rotation stopping part comprises a first tooth surface, and the second rotation stopping part comprises a second tooth surface, the first tooth surface and the second tooth surface being capable of meshing with each other.

[0007] Further, the first tooth surface comprises a first annular tooth part, the first annular tooth part being protrudingly arranged towards the second tooth surface, the second tooth surface comprises a second annular tooth part, the second annular tooth part being protrudingly arranged towards the first tooth surface, and the fixing member is connected at the center of the first annular tooth part and the center of the second annular tooth part.

[0008] Further, the sacral prosthesis further comprises a first connecting rod connected between the first connecting block and the main body part.

[0009] Further, the sacral prosthesis further comprises a first connecting head and a second connecting head, the first connecting head is connected to the main body, the first connecting head is provided with a first mounting slot, the second connecting head is connected to the first connecting block, the second connecting head is provided with a second mounting slot, and the first connecting rod is inserted into the first mounting slot and the second mounting slot.

[0010] Further, the sacral prosthesis further comprises a first connecting nail, a second connecting nail, a second connecting rod and a third connecting rod, the first connecting nail and the second connecting nail are connected to the vertebral body, the first connecting nail and the second connecting nail are cross arranged, the second connecting rod is connected between the first connecting nail and the first connecting block, and the third connecting rod is connected between the second connecting nail and the second connecting block.

[0011] Further, the sacral prosthesis further comprises a third connecting head and a fourth connecting head, the third connecting head is connected to the first connecting block, the fourth connecting head is connected to the second connecting block, the third connecting head is provided with a third mounting slot, the fourth connecting head is provided with a fourth mounting slot, the second connecting rod is inserted into the third mounting slot, and the third connecting rod is inserted into the fourth mounting slot.

[0012] Further, the fixing member comprises a fastening nail and a damping member, the fastening nail is provided with a mounting hole, the axis of the mounting hole intersects the axis of the fastening nail, the damping member is inserted into the mounting hole, and part of the structure of the damping member protrudes from the fastening nail in the radial direction of the fastening nail.

[0013] Further, the damping member is a damping rod, and the cross-sectional area of the damping rod gradually decreases from the first end of the damping rod to the second end of the damping rod.

[0014] Further, the main body is provided with a first sawtooth surface facing the surface of the sacrum or the vertebral body, the first connecting block is provided with a second sawtooth surface facing the surface of the first hip bone, and the second connecting block is provided with a third sawtooth surface facing the surface of the second hip bone.

[0015] Further, the sacral prosthesis further comprises a first screw, a second screw and a third screw, the first screw passes through the main body and is connected to the sacrum or the vertebral body, the second screw passes through the first connecting block and is connected to the first hip bone, and the third screw passes through the second connecting block and is connected to the second hip bone.

[0016] The technical scheme of the present application is applied, the main body part is used for connecting with the sacrum or the vertebral body, the first connecting block and the second connecting block are respectively used for connecting with the first hip bone and the second hip bone, the second connecting block can be adjustably arranged relative to the main body part, the fixing member is connected between the main body part and the second connecting block, the first rotation stopping part is arranged on the main body part, the second rotation stopping part is arranged on the second connecting block, and the first rotation stopping part and the second rotation stopping part are in rotation stopping cooperation. Through the above arrangement, since the main body part and the second connecting block are adjustably arranged, different lumbosacral angles can be realized, so that the sacral prosthesis can be adapted to different patients. At the same time, due to the arrangement of the first rotation stopping part and the second rotation stopping part, the positions of the main body part and the second connecting block are more stable and are not easy to be dislocated and rotated. Therefore, the technical scheme of the present application effectively solves the problem that the sacral prosthesis in the related art is difficult to adapt to different patients. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. In the drawings:

[0018] Figure 1 A perspective structural schematic view of an embodiment of the sacral prosthesis according to the present application is shown;

[0019] Figure 2 A perspective structural schematic view of the sacral prosthesis of Figure 1 is shown;

[0020] Figure 3 A perspective structural schematic view of the main body part of the sacral prosthesis of Figure 1 is shown;

[0021] Figure 4 A perspective structural schematic view of another view of the main body part of Figure 3 is shown;

[0022] Figure 5 A perspective structural schematic view of an exploded structure of the main body part of Figure 3 is shown;

[0023] Figure 6 A perspective structural schematic view of the first connecting block of the sacral prosthesis of Figure 1 is shown;

[0024] Figure 7 A perspective structural schematic view of another view of the first connecting block of Figure 6 is shown;

[0025] Figure 8 An exploded structural schematic view of the first connecting block of Figure 6 is shown;

[0026] Figure 9a perspective view of the second connecting block of the sacral prosthesis of Figure 1

[0027] Figure 10 a perspective view of the second connecting block of the sacral prosthesis of Figure 9

[0028] Figure 11 a perspective view of the second connecting block of the sacral prosthesis of Figure 9

[0029] Figure 12 a perspective view of the fixing member of the sacral prosthesis of Figure 1

[0030] Figure 13 a sectional view of the fixing member of the sacral prosthesis of Figure 12

[0031] Figure 14 a perspective view of the sacral prosthesis after implantation of Figure 1

[0032] wherein the above-mentioned drawings include the following reference signs:

[0033] 10, main body part; 11, first sawtooth surface; 20, first connecting block; 21, second sawtooth surface; 30, second connecting block; 31, third sawtooth surface; 40, fixing member; 41, fastening nail; 411, mounting hole; 42, damping member; 50, first rotation-stopping part; 51, first tooth surface; 511, first annular tooth part; 60, second rotation-stopping part; 61, second tooth surface; 611, second annular tooth part; 71, first connecting rod; 72, second connecting rod; 73, third connecting rod; 81, first connecting head; 811, first mounting groove; 82, second connecting head; 821, second mounting groove; 83, third connecting head; 831, third mounting groove; 84, fourth connecting head; 841, fourth mounting groove; 91, first connecting nail; 92, second connecting nail; 101, first screw; 102, second screw; 103, third screw. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative in nature and by no means as any limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative effort fall within the scope of protection of the present application.

[0035] ​​​​​​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.

[0036] 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.

[0037] like Figure 1 , Figure 2 as well as Figure 14 As shown, in this embodiment, the sacral prosthesis includes: a main body 10, a first connecting block 20, a second connecting block 30, a fixation member 40, a first anti-rotation part 50, and a second anti-rotation part 60. The main body 10 is used to connect to the sacrum or vertebral body. The first connecting block 20 is used to connect to the first hip bone and is spaced apart from the main body 10. The second connecting block 30 is connected between the main body 10 and the second hip bone, and the second connecting block 30 is adjustable relative to the main body 10 about a horizontal axis. The fixation member 40 is connected between the main body 10 and the second connecting block 30. The first anti-rotation part 50 is disposed on the main body 10. The second anti-rotation part 60 is disposed on the second connecting block 30, and the second anti-rotation part 60 can engage with the first anti-rotation part 50 to prevent rotation.

[0038] The technical scheme of the embodiment is applied, the main body part 10 is used for being connected with the sacrum or the vertebral body, the first connecting block 20 and the second connecting block 30 are respectively used for being connected with the first hip bone and the second hip bone, the second connecting block 30 can be adjustably arranged relative to the main body part 10, the fixing part 40 is connected between the main body part 10 and the second connecting block 30, the first rotation stopping part 50 is arranged on the main body part 10, the second rotation stopping part 60 is arranged on the second connecting block 30, and the first rotation stopping part 50 and the second rotation stopping part 60 are rotationally matched. Through the above arrangement, since the main body part 10 and the second connecting block 30 are adjustably arranged, different lumbosacral angles can be realized, so that the sacral prosthesis can be adapted to different patients. At the same time, due to the arrangement of the first rotation stopping part 50 and the second rotation stopping part 60, the positions of the main body part 10 and the second connecting block 30 are more stable and are not easy to be dislocated and rotated. Therefore, the technical scheme of the embodiment effectively solves the problem that the sacral prosthesis in the related art is difficult to adapt to different patients.

[0039] Specifically, the main body part 10 is used for being connected with the sacrum or the vertebral body, and the first connecting block 20 and the second connecting block 30 are respectively connected with the two hip bones, wherein the second connecting block 30 is adjustably arranged relative to the main body part 10 around a horizontal axis, which means that the doctor can adjust the position of the second connecting block 30 according to the anatomical structure of each patient to realize the best reconstruction of the pelvic ring stability. The fixing part 40 connects the main body part 10 and the second connecting block 30 to ensure the stability of the structure. The design of the first rotation stopping part 50 and the second rotation stopping part 60 can effectively prevent the second connecting block 30 from rotating in the adjusted position when the second rotation stopping part 60 is rotationally matched with the first rotation stopping part 50, thereby maintaining the stability of the reconstructed lumbosacral pelvic structure. The combination of the adjustable design and the rotationally matched mechanism not only improves the matching degree of the prosthesis and the patient's anatomical structure, but also prolongs the effective use period of the prosthesis, and meets the precise reconstruction needs of different patients.

[0040] It should be noted that the main body part 10 of the embodiment is used for replacing part or all of the sacrum, that is, when performing osteotomy, the sacrum is completely cut off or part of the sacrum is cut off according to the actual situation.

[0041] In the embodiment, the side of the main body part 10 facing the second connecting block 30 is provided with a notch part, and the first rotation stopping part 50 is arranged at the notch part, so that the space occupied by the main body part 10 is not too large, and the overall layout of the sacral prosthesis is not unreasonable.

[0042] The cross-sectional area of the main body part 10 gradually decreases from the direction close to the first sawtooth surface 11 to the direction away from the first sawtooth surface 11.

[0043] The horizontal axis in the above-mentioned "the second connecting block 30 is adjustably arranged relative to the main body 10 around a horizontal axis" refers to the axis direction parallel to the first rotation-stopping part 50, that is, the horizontal transverse direction. Regardless of whether the host is in an upright state or a lying state, the horizontal axis is always in the transverse direction.

[0044] As shown in Figures 1 to 5 and Figures 9 to 11 In the present embodiment, the first rotation-stopping part 50 includes a first tooth surface 51, and the second rotation-stopping part 60 includes a second tooth surface 61, which can be engaged with each other. The first rotation-stopping part 50 and the second rotation-stopping part 60 realize the rotation-stopping function through the engagement of the first tooth surface 51 and the second tooth surface 61. This design of tooth surface engagement ensures the accurate docking and stable connection between the various structures of the sacral prosthesis, effectively preventing unnecessary rotation of the sacral prosthesis when bearing the load of the human body, thereby enhancing the stability of the entire pelvic region.

[0045] Specifically, the cooperation of the first tooth surface 51 and the second tooth surface 61 not only ensures the good matching between the sacral prosthesis and the host bone, but also allows for a certain degree of fine adjustment to adapt to the individual differences of different patients' pelvic structures. This helps to promote the effective fusion of bone into the grid structure, thereby prolonging the service life of the sacral prosthesis and improving its long-term stability. In addition, the connection mode achieved through tooth surface engagement simplifies the surgical operation process, reduces the difficulty of surgery, helps to reduce the operation time and the incidence of postoperative complications, and provides a safer and more reliable solution for sacral reconstruction for patients.

[0046] In other embodiments not shown in the figures, the first rotation-stopping part 50 and the second rotation-stopping part 60 can also adopt other rotation-stopping structures, such as pins, buckles, etc., to achieve the same rotation-stopping effect.

[0047] As shown in Figures 1 to 5 and Figures 9 to 11 In the present embodiment, the first tooth surface 51 includes a first annular tooth part 511, which is protrudingly arranged towards the second tooth surface 61, and the second tooth surface 61 includes a second annular tooth part 611, which is protrudingly arranged towards the first tooth surface 51. The fixing member 40 is connected at the center of the first annular tooth part 511 and the center of the second annular tooth part 611. The above-mentioned design makes the first tooth surface 51 and the second tooth surface 61 form a mutual engagement structure when docked, thereby enhancing the connection strength and stability between the main body 10 and the second connecting block 30. The fixing member 40 is connected at the center of the first annular tooth part 511 and the center of the second annular tooth part 611. In this way, not only is the effective fixation of the main body 10 and the second connecting block 30 realized, but also the stress distribution at the connection is more uniform, which helps to prolong the service life of the prosthesis.

[0048] In addition, the design allows the sacral prosthesis to be adjusted in angle to a certain extent to adapt to the differences in the anatomical structures of different patients, improves the matching of the prosthesis and the individual bone interface, better reconstructs the mechanical structure and function of the lumbosacral region, promotes bone tissue healing, and reduces postoperative complications.

[0049] By adopting the paired connection of the first annular tooth part 511 and the second annular tooth part 611, in combination with the fixing part 40 located at the center of the first annular tooth part 511, the sacral prosthesis is realized to have certain flexibility and adaptability while ensuring stable connection.

[0050] As shown in Figure 1 , Figure 2 and Figure 14 , in the embodiment, the sacral prosthesis further comprises a first connecting rod 71 connected between the first connecting block 20 and the main body part 10. The above-mentioned design provides additional stability and structural support for the installation of the sacral prosthesis. The first connecting rod 71 not only enhances the connection strength between the main body part 10 and the first connecting block 20, but also disperses and transmits force when the patient is active, reduces the load of a single connection point, and thus reduces the risk of prosthesis fracture or loosening.

[0051] Through the cooperation of the first connecting rod 71 and the first connecting block 20, the sacral prosthesis can better adapt to the mechanical requirements of the patient's pelvic ring, promote bone fusion process, and at the same time ensure the stability of the pelvis after operation. And the split design of the main body part 10 and the first connecting block 20 ensures the effectiveness and safety of long-term implantation while meeting the individual matching.

[0052] As shown in Figures 1 to 8 , in the embodiment, the sacral prosthesis further comprises a first connecting head 81 and a second connecting head 82, the first connecting head 81 is connected to the main body part 10, the first connecting head 81 is provided with a first mounting groove 811, the second connecting head 82 is connected to the first connecting block 20, the second connecting head 82 is provided with a second mounting groove 821, and the first connecting rod 71 is inserted into the first mounting groove 811 and the second mounting groove 821. The first connecting head 81 and the second connecting head 82 provide additional connection flexibility and stability for the sacral prosthesis. Specifically, the first connecting head 81 is arranged on the main body part 10 and provided with the first mounting groove 811, and the second connecting head 82 is mounted on the first connecting block 20 and provided with the second mounting groove 821. This design allows the first connecting rod 71 to be inserted into the two mounting grooves at the same time, forming a stable connection point, ensuring the precise alignment and close connection between the components of the sacral prosthesis. In this way, not only the overall stability of the prosthesis is enhanced, but also the micro-adjustment according to the specific anatomical structure of the patient during the operation is allowed, so as to realize more personalized and precise implantation effect.

[0053] Specifically, the first connecting head 81 and the second connecting head 82 are both rotatably arranged, so that the angles of the first mounting slot 811 and the second mounting slot 821 can be adjusted, which can facilitate the installation of the first connecting rod 71. At the same time, in order to ensure the stability of the position of the first connecting rod 71, when the first connecting rod 71 is inserted into the first mounting slot 811 and the second mounting slot 821, the first cap nail and the second cap nail are inserted into the first mounting slot 811 and the second mounting slot 821 respectively and abut with the first connecting rod 71, so that the position of the first connecting rod 71 is more stable.

[0054] The cooperation between the first mounting slot 811 and the first cap nail is threaded connection, and the cooperation between the second mounting slot 821 and the second cap nail is threaded connection.

[0055] As shown in Figures 1 to 11 In this embodiment, the sacral prosthesis further includes a first connecting nail 91, a second connecting nail 92, a second connecting rod 72, and a third connecting rod 73. The first connecting nail 91 and the second connecting nail 92 are both connected with the vertebral body, and the first connecting nail 91 and the second connecting nail 92 are cross arranged. The second connecting rod 72 is connected between the first connecting nail 91 and the first connecting block 20, and the third connecting rod 73 is connected between the second connecting nail 92 and the second connecting block 30. The first connecting nail 91 and the second connecting nail 92 are connected with the vertebral body, and are cross arranged, which enhances the stability of fixation and can disperse the load to adapt to the complex mechanical environment in the patient's body. The second connecting rod 72 is connected between the first connecting nail 91 and the first connecting block 20, and the third connecting rod 73 is connected between the second connecting nail 92 and the second connecting block 30, which realizes the effective connection of the lumbar vertebrae and the sacral prosthesis and ensures the stability of the pelvic ring. Through the first connecting nail 91, the second connecting nail 92, the second connecting rod 72, and the third connecting rod 73, the sacral prosthesis can better adapt to the anatomical structure of different patients, improve the biomechanical adaptability after surgery and the long-term stability of the prosthesis. This structure not only reduces unnecessary stress concentration between the prosthesis and the host bone, but also improves the safety and reliability of the overall fixation system by increasing the friction and support of the contact surface.

[0056] As shown in Figures 1 to 11As shown, in this embodiment, the sacral prosthesis further comprises a third connecting head 83 and a fourth connecting head 84, the third connecting head 83 is connected to the first connecting block 20, and the fourth connecting head 84 is connected to the second connecting block 30, the third connecting head 83 is provided with a third mounting slot 831, and the fourth connecting head 84 is provided with a fourth mounting slot 841, the second connecting rod 72 is inserted into the third mounting slot 831, and the third connecting rod 73 is inserted into the fourth mounting slot 841. The third connecting head 83 and the fourth connecting head 84 are respectively connected to the first connecting block 20 and the second connecting block 30, and each is provided with a third mounting slot 831 and a fourth mounting slot 841. Such design allows the second connecting rod 72 to be inserted into the third mounting slot 831, and the third connecting rod 73 to be inserted into the fourth mounting slot 841, thereby forming an expanded connecting system. This system not only enhances the connection strength between the prosthesis components, but also allows more flexible adjustment to adapt to the differences in individual patient anatomy. Through the synergistic effect of multiple connection points, the stability of the entire prosthesis is significantly improved, while reducing the stress borne by a single connection point, which helps to prolong the effective service life of the prosthesis. This multi-point connection and adjustment mechanism can better maintain the biomechanical balance of the lumbosacral region, promote bone fusion process, and reduce postoperative complications.

[0057] It should be noted that the end of the first connecting pin 91 is provided with a fifth mounting slot, and the end of the second connecting pin 92 is provided with a sixth mounting slot, i.e. the second connecting rod 72 can be inserted into the third mounting slot 831 and the fifth mounting slot, and the third connecting rod 73 can be inserted into the fourth mounting slot 841 and the sixth mounting slot.

[0058] And in order to ensure the stability of the second connecting rod 72 and the third connecting rod 73, a cap pin with the same structure as the first cap pin described above is also provided to fix the second connecting rod 72 and the third connecting rod 73.

[0059] As shown in Figure 12 and Figure 13 In this embodiment, the fixing member 40 comprises a fastening pin 41 and a damping member 42, the fastening pin 41 is provided with a mounting hole 411, the axis of the mounting hole 411 intersects the axis of the fastening pin 41, the damping member 42 is inserted into the mounting hole 411, and part of the structure of the damping member 42 protrudes radially from the fastening pin 41. The above arrangement allows the damping member 42 to be accurately inserted into the mounting hole 411, and part of the structure to protrude radially from the fastening pin 41. This not only enhances the connection strength and stability between the fastening pin 41 and the sacral prosthesis body, but also the protruding part of the damping member 42 can play a role in buffering and dispersing stress when bearing external load, which helps to reduce the relative displacement between the sacral prosthesis and the host bone caused by movement or daily activities, thereby reducing the possibility of sacral prosthesis micro-motion and ensuring effective fusion and long-term stability of the sacral prosthesis and the bone.

[0060] And the damping member 42 can increase the friction resistance, and further prevent the fastening nail 41 from exiting. The damping member 42 is a damping rod, and the cross-sectional area of the damping rod gradually decreases from the first end of the damping rod to the second end of the damping rod. The damping member 42 adopts the design of the damping rod, and the cross-sectional area gradually decreases from the first end to the second end. The damping rod with such a tapered structure can tightly fill the mounting hole 411 during the connection process, form a stable mechanical riveting, effectively prevent the loosening and back rotation of the connection part, and provide additional stability for the prosthesis. Because the cross-sectional area of the damping rod is gradually changed, it can uniformly distribute the pressure when bearing the load, reduce stress concentration, thereby prolonging the service life of the prosthesis and reducing the incidence of postoperative complications. In addition, this special damping design can also absorb part of the impact force caused by movement, improving the quality of life of patients after surgery.

[0061] As shown in Figures 1 to 11 In this embodiment, the first sawtooth surface 11 is arranged on the surface of the main body part 10 towards the sacrum or vertebral body, the second sawtooth surface 21 is arranged on the surface of the first connecting block 20 towards the first hip bone, and the third sawtooth surface 31 is arranged on the surface of the second connecting block 30 towards the second hip bone. The design of the first sawtooth surface 11, the second sawtooth surface 21 and the third sawtooth surface 31 effectively prevents the sacral prosthesis from micro-motion by increasing the friction coefficient of the contact surface, promotes the close fit of the bone tissue and the prosthesis, thereby accelerating the bone fusion process and improving the stability of the prosthesis.

[0062] Specifically, by arranging the sawtooth structure on the contact surface of the sacral prosthesis and the sacrum, lumbar vertebrae and hip bone, the contact area of the bone interface is increased, and the stress concentration borne by the screw is significantly reduced, so that the prosthesis can better adapt to the pelvic angle and sacral shape of different patients, prolong the service life of the prosthesis, and reduce postoperative complications.

[0063] In addition, the contact interfaces of the first sawtooth surface 11, the second sawtooth surface 21 and the third sawtooth surface 31 with the host bone are all designed as wedge structures, which further enhances the initial stability of the prosthesis and ensures the reconstruction quality and biomechanical stability of the patient's pelvic ring after surgery.

[0064] It should be noted that the main body part includes a first bone ingrowth grid structure, the first connecting block includes a second bone ingrowth grid structure, the third connecting block includes a third bone ingrowth grid structure, the first sawtooth surface 11 is arranged on the first bone ingrowth grid structure, the second sawtooth surface 21 is arranged on the second bone ingrowth grid structure, and the third sawtooth surface 31 is arranged on the third bone ingrowth grid structure.

[0065] As shown in Figures 1 to 11 and Figure 14As shown, in the present embodiment, the sacral prosthesis further comprises a first screw 101, a second screw 102 and a third screw 103, the first screw 101 passes through the main body 10 and is connected with the sacrum or vertebral body, the second screw 102 passes through the first connecting block 20 and is connected with the first hip bone, and the third screw 103 passes through the second connecting block 30 and is connected with the second hip bone. The above arrangement not only enhances the stability between the sacral prosthesis and the host bone, but also better disperses and transmits body load through distributed fixation points, reduces stress concentration on a single fixation point, and thus improves the overall service life and biocompatibility of the prosthesis. In addition, the cooperation of the first screw 101, the second screw 102 and the third screw 103 with the main body 10, the first connecting block 20 and the second connecting block 30 allows the sacral prosthesis to have certain adjustability during installation, can adapt to the differences in anatomical structures of different patients, realize more personalized pelvic reconstruction, promote bone tissue growth and fusion, and reduce the risk of postoperative complications.

[0066] Specifically, the second screw 102 is three, that is, the second screw 102 comprises a first sub-screw, a second sub-screw and a third sub-screw, and the third screw 103 is three, that is, the third screw 103 comprises a fourth sub-screw, a fifth sub-screw and a sixth sub-screw. The first sub-screw, the second sub-screw and the third sub-screw are arranged in the direction from close to the main body 10 to far from the main body 10, that is, the distance between the first sub-screw and the main body is the smallest; the fourth sub-screw, the fifth sub-screw and the sixth sub-screw are arranged in the direction from close to the main body 10 to far from the main body 10, that is, the distance between the fourth sub-screw and the main body is the smallest, the axis of the first sub-screw and the axis of the second sub-screw are cross arranged, the axis of the first sub-screw and the axis of the third sub-screw are parallel arranged, the axis of the fourth sub-screw and the axis of the fifth sub-screw are cross arranged, and the axis of the fourth sub-screw and the axis of the sixth sub-screw are parallel arranged.

[0067] As Figure 1 , Figure 2 and Figure 14The use of the sacral prosthesis of the present embodiment is as follows. First, the main body 10 is preliminarily fixed to the sacrum or vertebral body by the first screw 101 to ensure the stability of the prosthesis main body. Then, the second screw 102 and the third screw 103 are used to pass through the first connecting block 20 and the second connecting block 30, respectively, to establish a connection with the iliac bones on both sides, which aims to provide a preliminary reconstruction of the pelvic ring. Next, according to the lumbar-sacral angle and the size of the pelvis of the individual patient, the position of the second connecting block 30 is adjusted to achieve the best matching state around the horizontal axis relative to the main body 10 to ensure the stability and mechanical adaptability of the lumbar-sacral pelvic structure, i.e., to meet the lumbar-sacral angle of the host. After the second connecting block 30 is adjusted to the appropriate position, the main body 10 and the second connecting block 30 are connected using the fixing member 40. The fastening nails 41 in the fixing member 40 pass through the connecting points of the main body 10 and the second connecting block 30, and the damping members 42 are inserted into the mounting holes 411 of the fastening nails 41. The partial structure protrudes radially along the fastening nails 41 to form a stable connection while reducing the stress between the prosthesis and the bone tissue section. To enhance the stability of the entire sacral prosthesis system, the first connecting rod 71 is inserted into the first mounting slot 811 of the first connecting head 81 and the second mounting slot 821 of the second connecting head 82 to connect the main body 10 and the first connecting block 20. At the same time, the second connecting rod 72 and the third connecting rod 73 are connected to the first connecting nail 91 and the second connecting nail 92 through the third mounting slot 831 of the third connecting head 83 and the fourth mounting slot 841 of the fourth connecting head 84, respectively, to form a multi-point support and fixation structure. Finally, the mutual engagement of the first rotation-stopping part 50 and the second rotation-stopping part 60, i.e., the abutment of the first annular tooth part 511 and the second annular tooth part 611, ensures that the second connecting block 30 does not rotate in the adjusted position, maintaining the stability of the reconstructed structure.

[0068] In the description of the present application, it should be understood that "a plurality of" refers to two or more. The orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description. Without the opposite indication, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0069] For purposes of the description hereinafter, spatial or directional terms, for example, "above", "below", "upper", "lower", and the like, can be used, and relate to the device as illustrated in the figures. However, it is to be understood that no absolute or relative orientation of the device is intended or implied, unless specifically described as such. Terms concerning attachments, coupling and the like, such as "connected" and "coupled" and the like, are to be construed in accordance with their normal meanings, that is, as referring to an indirect or direct connection or coupling. Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to". Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to".

[0070] In addition, it should be pointed out that the use of the terms "first", "second" and the like, to describe various elements, is merely intended to differentiate the elements from one another, and does not connote any special order or order of precedence, unless otherwise specifically indicated. Thus, the use of the terms "first", "second" and the like, is not intended to limit the scope of the present application, and is not intended to connote any special order or order of precedence.

[0071] The preferred embodiments herein disclosed are not intended to limit or restrict the scope of the application, but merely convey the best mode contemplated by the inventors of carrying out the claimed application. Any modifications, variations or changes within the spirit and scope of the application as disclosed herein will be considered to fall within the scope of the application.

Claims

1. A sacral prosthesis, characterized in that, include: The main body (10) is used to connect with the sacrum or vertebral body; A first connecting block (20) is used to connect to the first hip bone and is spaced apart from the main body (10); A second connecting block (30) is connected between the main body (10) and the second hip bone. The second connecting block (30) is adjustable relative to the main body (10) about a horizontal axis. A fastener (40) is connected between the main body (10) and the second connecting block (30); A first anti-rotation part (50) is provided on the main body part (10); The second anti-rotation part (60) is disposed on the second connecting block (30), and the second anti-rotation part (60) can cooperate with the first anti-rotation part (50) to prevent rotation.

2. The sacral prosthesis according to claim 1, characterized in that, The first anti-rotation part (50) includes a first tooth surface (51), and the second anti-rotation part (60) includes a second tooth surface (61). The first tooth surface (51) and the second tooth surface (61) can mesh with each other.

3. The sacral prosthesis according to claim 2, characterized in that, The first tooth surface (51) includes a first annular tooth portion (511) which protrudes toward the second tooth surface (61). The second tooth surface (61) includes a second annular tooth portion (611) which protrudes toward the first tooth surface (51). The fixing member (40) is connected to the center of the first annular tooth portion (511) and the center of the second annular tooth portion (611).

4. The sacral prosthesis according to claim 1, characterized in that, The sacral prosthesis also includes a first connecting rod (71), which is connected between the first connecting block (20) and the main body (10).

5. The sacral prosthesis according to claim 4, characterized in that, The sacral prosthesis also includes a first connector (81) and a second connector (82). The first connector (81) is connected to the main body (10) and has a first mounting groove (811). The second connector (82) is connected to the first connecting block (20) and has a second mounting groove (821). The first connecting rod (71) is inserted into the first mounting groove (811) and the second mounting groove (821).

6. The sacral prosthesis according to claim 1, characterized in that, The sacral prosthesis also includes a first connecting pin (91), a second connecting pin (92), a second connecting rod (72), and a third connecting rod (73). The first connecting pin (91) and the second connecting pin (92) are both connected to the vertebral body. The first connecting pin (91) and the second connecting pin (92) are arranged crosswise. The second connecting rod (72) is connected between the first connecting pin (91) and the first connecting block (20). The third connecting rod (73) is connected between the second connecting pin (92) and the second connecting block (30).

7. The sacral prosthesis according to claim 6, characterized in that, The sacral prosthesis also includes a third connector (83) and a fourth connector (84). The third connector (83) is connected to the first connecting block (20), and the fourth connector (84) is connected to the second connecting block (30). The third connector (83) is provided with a third mounting groove (831), and the fourth connector (84) is provided with a fourth mounting groove (841). The second connecting rod (72) is inserted into the third mounting groove (831), and the third connecting rod (73) is inserted into the fourth mounting groove (841).

8. The sacral prosthesis according to claim 1, characterized in that, The fastener (40) includes a fastening pin (41) and a damping element (42). The fastening pin (41) has a mounting hole (411). The axis of the mounting hole (411) intersects the axis of the fastening pin (41). The damping element (42) is inserted into the mounting hole (411). A portion of the structure of the damping element (42) protrudes radially from the fastening pin (41).

9. The sacral prosthesis according to claim 8, characterized in that, The damping element (42) is a damping rod, and the cross-sectional area of ​​the damping rod gradually decreases from the first end to the second end of the damping rod.

10. The sacral prosthesis according to claim 1, characterized in that, The main body (10) has a first serrated surface (11) facing the sacrum or the vertebral body, the first connecting block (20) has a second serrated surface (21) facing the first hip bone, and the second connecting block (30) has a third serrated surface (31) facing the second hip bone.

11. The sacral prosthesis according to claim 1, characterized in that, The sacral prosthesis also includes a first screw (101), a second screw (102), and a third screw (103). The first screw (101) passes through the main body (10) and is connected to the sacrum or the vertebral body. The second screw (102) passes through the first connecting block (20) and is connected to the first hip bone. The third screw (103) passes through the second connecting block (30) and is connected to the second hip bone.

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