CN116747053A

CN116747053A - sacral prosthesis

Info

Publication number: CN116747053A
Application number: CN202311009360.3A
Authority: CN
Inventors: 汤小东; 尉然; 于沂阳; 刘胜强
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2023-08-11
Filing date: 2023-08-11
Publication date: 2023-09-15
Anticipated expiration: 2043-08-11
Also published as: CN116747053B

Abstract

The present application provides a sacral prosthesis comprising: the first lumbar vertebra connecting part is arranged at the first end of the first main body, and the first ilium connecting part is arranged at the second end of the first main body; the first end of the second main body is provided with a second lumbar vertebra connecting part, and the second end of the second main body is provided with a second ilium connecting part; the first end of the first main body and the first end of the second main body are connected in an angle-adjustable and detachable mode. The technical scheme of the application effectively solves the problem of poor suitability of the sacral prosthesis in the related technology.

Description

Sacral prosthesis

Technical Field

The application relates to the technical field of prostheses, in particular to a sacral prosthesis.

Background

For patients with sacral tumors, it is often necessary to resect the sacrum, even entirely, and sometimes to enlarge the resected portion of the ilium to obtain a satisfactory resection margin, and then implant the sacral prosthesis. Because the curvature and shape of the spine, the angle of the pelvis, the shape of the sacrum, etc., vary from patient to patient, custom-made sacral prostheses need to be prepared prior to implantation.

In consideration of the inconsistent situation with the preoperative planning caused by various factors in the implantation process, for example, when the original planned implantation of the two-side sacral prosthesis is changed to only one-side sacral prosthesis, or the original planned implantation of the one-side sacral prosthesis is changed to two-side sacral prosthesis, or the included angle between the two-side sacral prostheses needs to be adjusted, a plurality of customized sacral prostheses are generally needed to be prepared to cope with the change of the requirements in the implantation process. Thus, the need to prepare multiple customized sacral prostheses results in poor fit of the related art sacral prostheses, and the need to prepare multiple customized sacral prostheses increases costs.

Disclosure of Invention

The application mainly aims to provide a sacral prosthesis to solve the problem of poor suitability of the sacral prosthesis in the related art.

To achieve the above object, according to one aspect of the present application, there is provided a sacral prosthesis comprising: the first lumbar vertebra connecting part is arranged at the first end of the first main body, and the first ilium connecting part is arranged at the second end of the first main body; the first end of the second main body is provided with a second lumbar vertebra connecting part, and the second end of the second main body is provided with a second ilium connecting part; the first end of the first main body and the first end of the second main body are connected in an angle-adjustable and detachable mode.

Further, the first end of the first main body is provided with a first end fluted disc adjacent to the first lumbar vertebra connecting portion, the first end of the second main body is provided with a second end fluted disc adjacent to the second lumbar vertebra connecting portion, the first end fluted disc and the second end fluted disc can be meshed and matched, and the sacrum prosthesis further comprises a first fastener capable of locking or unlocking the first end fluted disc and the second end fluted disc.

Further, the first main body is of a rod-shaped structure, and a preset included angle is formed between the top surface of the first end fluted disc and the axis of the first main body; and/or the first end tooth plate comprises a first ratchet plate, and the second end tooth plate comprises a second ratchet plate capable of being meshed with the first ratchet plate.

Further, the first body is a rod-like structure, and the first ilium connection portion includes a connection inclined surface disposed at an angle to an axis of the rod-like structure, the connection inclined surface being in contact engagement with the ilium.

Further, the first ilium connection portion further includes a first screw hole disposed on the second end of the first body, the sacral prosthesis further including a first screw threaded through the first screw hole to fixedly connect the first body with the ilium; the connecting inclined plane is provided with a connecting bulge which can extend into ilium; and/or the connecting inclined plane is provided with a first porous structure, and the first porous structure is in contact fit with ilium.

Further, the first main body comprises a first rod body and a second rod body, the second rod body can be rotationally connected with the first rod body by taking the axis of the first rod body as the center, the first lumbar vertebra connecting part is arranged at the first end of the first rod body, the second end of the first rod body is rotationally connected with the first end of the second rod body, and the connecting inclined plane is arranged at the second end of the second rod body and is arranged at an angle with the axis of the second rod body.

Further, the first body further includes an extension rod detachably connected between the first rod body and the second rod body; the second end of the first rod body is inserted into the first end of the extension rod, and the second end of the extension rod is inserted into the first end of the second rod body.

Further, a first avoidance hole is formed in the side wall of the extension rod, and the sacral prosthesis further comprises a second fastener which penetrates through the first avoidance hole to be in abutting fit with the second end of the first rod body; and/or, a second avoidance hole is formed in the side wall of the second rod body, the sacrum prosthesis further comprises a third fastener, and the third fastener penetrates through the second avoidance hole to be in butt fit with the first end of the second rod body.

Further, the diameter of the second end of the first rod body gradually decreases from the first end of the first rod body to the second end of the first rod body, the first end of the extension rod is provided with a first conical hole in plug fit with the second end of the first rod body, the first conical hole gradually decreases from the first end of the extension rod to the second end of the extension rod, and when the first rod body is in plug fit with the extension rod, the axis of the first rod body coincides with the axis of the extension rod; and/or the diameter of the second end of the extension rod gradually decreases from the first end of the extension rod to the second end of the extension rod, the first end of the second rod body is provided with a second conical hole which is in plug-in fit with the second end of the extension rod, the second conical hole gradually decreases from the first end of the second rod body to the second end of the second rod body, and when the second rod body is in plug-in fit with the extension rod, the axis of the second rod body coincides with the axis of the extension rod.

Further, the first lumbar vertebra connecting part comprises a second screw hole and a second porous structure arranged on the side wall of the first main body, and the second porous structure is in contact fit with lumbar vertebra; the second screw hole penetrates through the side wall of the first main body and the second porous structure; the sacral prosthesis further includes a second screw disposed through the second screw hole to fixedly connect the first body with the lumbar vertebra.

Further, the first screw comprises a screw head and a screw rod, the first screw hole comprises a through hole section for avoiding the screw rod and a counter bore section matched with the screw head stop, and the through hole section is communicated with the counter bore section; the diameter of the counterbore section gradually decreases in a direction from the exterior of the first body to the through bore section to enable the first screw to oscillate within the first screw bore.

With the technical scheme of the application, the sacral prosthesis comprises a first main body and a second main body. The first end of first main part is provided with first lumbar vertebra connecting portion, and the second end of first main part is provided with first ilium connecting portion. Thus, the first end of the first body can be attached to the lumbar spine and the second end of the first body can be attached to the ilium on one side of the lumbar spine. The first end of second main part is provided with second lumbar vertebrae connecting portion, and the second end of second main part is provided with second ilium connecting portion. In this way, the first end of the second body can be attached to the lumbar spine and the second end of the second body can be attached to the ilium bone on the other side of the lumbar spine. The first end of the first main body and the first end of the second main body are connected in an angle-adjustable and detachable mode. Thus, the angle between the first main body and the second main body can be adjusted according to the actual requirement of the patient, the first main body and the second main body can be selectively implanted together according to the actual requirement of the patient, and only the first main body or the second main body can be implanted according to the actual requirement of the patient. In this way, the fit of the sacral prosthesis is improved, avoiding the need to prepare multiple customized sacral prostheses as in the related art. Therefore, the technical scheme of the application effectively solves the problem of poor suitability of the sacral prosthesis in the related technology.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 shows an orthographic view of an embodiment of a sacral prosthesis according to the application in connection with a lumbar vertebra and ilium;

fig. 2 shows a schematic perspective view of an embodiment of a sacral prosthesis according to the present application;

fig. 3 shows a schematic perspective view of a first body of the sacral prosthesis of fig. 2;

fig. 4 shows a schematic exploded view of a first body of the sacral prosthesis of fig. 3;

fig. 5 shows a schematic front view of a first ilium connection of the sacral prosthesis of fig. 2 inserted into and in abutting engagement with an ilium;

fig. 6 shows a schematic perspective view of the sacral prosthesis of fig. 2;

fig. 7 shows a schematic cross-sectional view of the sacral prosthesis of fig. 2 at a first iliac connection.

Wherein the above figures include the following reference numerals:

10. a first body; 11. a first rod body; 12. a second rod body; 13. an extension rod; 14. a first lumbar vertebra connection; 141. a second screw hole; 142. a second porous structure; 15. a first ilium connection; 151. a connecting inclined plane; 152. a first screw hole; 1521. a through-hole section; 1522. a counterbore section; 153. a connection protrusion; 154. a first porous structure; 16. a first end toothed disc; 17. A first avoidance hole; 18. a first tapered bore; 19. a second tapered bore;

20. a second body; 21. a second lumbar vertebra connection; 22. a second ilium connection; 23. a second end toothed disc;

30. a first fastener;

40. lumbar vertebrae;

50. ilium bone.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 to 6, the sacral prosthesis of the present embodiment includes a first body 10 and a second body 20. The first end of the first body 10 is provided with a first lumbar vertebra connection 14 and the second end of the first body 10 is provided with a first ilium connection 15. The first end of the second body 20 is provided with a second lumbar vertebra connection 21 and the second end of the second body 20 is provided with a second ilium connection 22. Wherein the first end of the first body 10 is angularly adjustable and detachably connected with the first end of the second body 20.

Applying the solution of the present embodiment, the sacral prosthesis comprises a first body 10 and a second body 20. The first end of the first body 10 is provided with a first lumbar vertebra connection 14 and the second end of the first body 10 is provided with a first ilium connection 15. Thus, the first end of the first body 10 can be connected to the lumbar vertebra 40, and the second end of the first body 10 can be connected to the ilium 50 on one side of the lumbar vertebra 40. The first end of the second body 20 is provided with a second lumbar vertebra connection 21 and the second end of the second body 20 is provided with a second ilium connection 22. Thus, the first end of the second body 20 can be connected to the lumbar vertebra 40 and the second end of the second body 20 can be connected to the ilium 50 on the other side of the lumbar vertebra 40. Wherein the first end of the first body 10 is angularly adjustable and detachably connected with the first end of the second body 20. In this way, the angle between the first body 10 and the second body 20 can be adjusted according to the actual needs of the patient, the first body 10 and the second body 20 can be selectively implanted together according to the actual needs of the patient, and only the first body 10 or the second body 20 can be implanted according to the actual needs of the patient. In this way, the fit of the sacral prosthesis is improved, avoiding the need to prepare multiple customized sacral prostheses as in the related art. Therefore, the technical scheme of the embodiment effectively solves the problem of poor suitability of the sacral prosthesis in the related technology.

By applying the technical scheme of the embodiment, the sacral prosthesis can be suitable for a semi-lateral sacrectomy patient or a full sacrectomy patient, maintain the stability of pelvis while maintaining physiological structures, and promote the recovery of pelvis and lower limb functions. The sacrum prosthesis has simple structure and convenient operation, shortens the operation time and reduces the infection risk.

As shown in fig. 1 to 6, a first end of the first body 10 is provided with a first end toothed disc 16 disposed adjacent to the first lumbar vertebrae connection portion 14, and a first end of the second body 20 is provided with a second end toothed disc 23 disposed adjacent to the second lumbar vertebrae connection portion 21. The first end toothed disc 16 is capable of meshing engagement with the second end toothed disc 23, and the sacral prosthesis further includes a first fastener 30 capable of locking or unlocking the first end toothed disc 16 and the second end toothed disc 23. The first fastener 30 has a fastened state, a loosened state, and a detached state. When the first fastening member 30 is in the fastening state, the first end tooth disc 16 is engaged with the second end tooth disc 23, so that the first body 10 is fixedly connected with the second body 20. When the first fastener 30 is in a loose state, an adjusting gap is formed between the first end tooth disc 16 and the second end tooth disc 23, so that the angle between the first main body 10 and the second main body 20 can be adjusted. The first and second end-toothed discs 16, 23 are separable when the first fastener 30 is in a disassembled state, so that the first and second bodies 10, 20 are separable. Also, the first end gear plate 16 is disposed adjacent to the first lumbar vertebrae connection portion 14 such that the first end of the first body 10 can be detachably connected with the first end of the second body 20 in a state of being connected with the lumbar vertebrae 40. The second end-toothed disc 23 is disposed adjacent to the second lumbar vertebrae connection portion 21 so that the first end of the second body 20 can be detachably connected with the first end of the first body 10 in a state of being connected with the lumbar vertebrae 40.

In this embodiment, the first end toothed disc 16 and the second end toothed disc 23 are provided with threaded holes that mate with the first fasteners 30, the bottoms of the threaded holes are provided with locking tabs, and the apertures of the locking tabs are smaller than the apertures of the threaded holes. Thus, after the first fastener 30 enters the threaded hole, the locking piece can deform, so that the friction force between the locking piece and the first fastener 30 is increased, and the first fastener 30 is more reliably connected with the first end fluted disc 16 and the second end fluted disc 23.

As shown in fig. 1 to 6, the first body 10 has a rod-shaped structure, and a predetermined included angle is formed between the top surface of the first end tooth disc 16 and the axis of the first body 10. In this way, the preset included angle between the top surface of the first end tooth disc 16 and the axis of the first main body 10 can play a role in preventing the first end tooth disc 16 from being meshed with the second end tooth disc 23 when being stressed. In this embodiment, the preset included angle is in the range of 20 ° to 60 °.

As shown in fig. 1-6, the first end gear disk 16 includes a first ratchet disk and the second end gear disk 23 includes a second ratchet disk that is capable of meshing engagement with the first ratchet disk. The arrangement of the first ratchet plate and the second ratchet plate makes the engagement of the first end toothed plate 16 and the second end toothed plate 23 more reliable, and improves the reliability of the implanted sacrum prosthesis in use. Moreover, the arrangement of the first ratchet plate and the second ratchet plate enables the first end tooth plate 16 and the second end tooth plate 23 to reduce the condition that the included angle between the first main body 10 and the second main body 20 is reduced due to stress.

As shown in fig. 1 to 6, the first body 10 is a rod-like structure, and the first ilium connection portion 15 includes a connection slope 151 disposed at an angle to an axis of the rod-like structure, the connection slope 151 being in contact engagement with the ilium 50. The connection inclined surface 151 facilitates connection with the ilium 50, and can increase the contact area between the first ilium connection portion 15 and the ilium 50, so that the connection between the first ilium connection portion 15 and the ilium 50 is more reliable. In this embodiment, the angle between the connecting bevel 151 and the axis of the rod body is 45 °, enabling a precise fit with resected faces of ilium 50 of different shapes. In this embodiment, the connection slope 151 is an oval rough surface.

As shown in fig. 1-6, the first ilium connection portion 15 further includes a first screw hole 152 disposed on the second end of the first body 10, and the sacral prosthesis further includes a first screw that passes through the first screw hole 152 to fixedly connect the first body 10 with the ilium 50. The provision of the first screw hole 152 and the first screw makes the connection between the first ilium connection 15 and the ilium 50 more reliable and stable. The connection bevel 151 is provided with connection protrusions 153, and the connection protrusions 153 can extend into the ilium 50. The provision of the connection protrusion 153 makes the connection between the connection bevel 151 and the ilium 50 more reliable and stable. In this embodiment, the connection protrusions 153 are a plurality of cones arranged at intervals, and the bottom surfaces of the cones are connected to the connection inclined surfaces 151.

As shown in fig. 1 to 6, the connecting slope 151 is provided with a first porous structure 154, and the first porous structure 154 is in contact fit with the ilium 50. The provision of the first porous structure 154 allows for the ilium 50 to grow into the first porous structure 154, improving the long-term stability of the connection of the ilium 50 to the connecting bevel 151, helping to restore biostability. In this embodiment, the first porous structure 154 is a bone-like trabecular structure.

As shown in fig. 5, the first body 10 includes a first rod 11 and a second rod 12, and the second rod 12 is rotatably connected to the first rod 11 about an axis of the first rod 11. The first lumbar vertebra connecting portion 14 is disposed at a first end of the first rod body 11, and a second end of the first rod body 11 is rotatably connected to a first end of the second rod body 12. The connection bevel 151 is disposed at the second end of the second rod body 12 and is disposed at an angle to the axis of the second rod body 12. In this way, by rotating the second rod body 12 relative to the first rod body 11, the orientation of the connection inclined surface 151 can be adjusted so that the portion of the connection inclined surface 151 forming an acute angle with the side wall of the second rod body 12 forms an insertion portion, the insertion portion of the first ilium connection portion is inserted into the ilium 50, and the connection inclined surface 151 is in abutting engagement with the ilium 50. Such an implantation can withstand greater forces to further improve stability of the sacral prosthesis after implantation and to further improve the fit of the sacral prosthesis. In this way, the rotation of the second rod 12 relative to the first rod 11 enables the sacral prosthesis to meet the pelvic reconstruction needs of different patients, depending on the pelvic size and bone interface orientation of the different patients.

By applying the technical solution of the present embodiment, the connection bevel 151 can be in contact fit with the ilium 50, and the connection bevel 151 can also be inserted into the ilium 50 and be in abutting fit with the ilium 50. Thus, the method is applicable to different patients, is applicable to osteotomy boundaries of different ilium bones 50, improves matching accuracy, improves biological stress conduction of pelvis, improves recent stability, and has better long-term restorability. The implantation mode that the connection inclined plane 151 is inserted into the ilium 50 and is in abutting fit with the ilium 50 under the action of gravity is suitable for the condition of larger stress, and when the implantation mode is used, the shearing force born by the first screw when being connected with the ilium 50 is smaller, so that the service life of the first screw can be prolonged. When the connecting inclined surface 151 is inserted into the ilium 50 and is implanted in an abutting fit with the ilium 50, the connecting inclined surface 151 is made parallel to the horizontal plane, so that the bearing capacity of the sacral prosthesis can be improved.

In this embodiment, the first end of the first rod 11 and the first end of the second rod 12 are provided with nail holes for connecting the nail rod system.

As shown in fig. 1 to 6, the first body 10 further includes an extension rod 13 detachably connected between the first rod body 11 and the second rod body 12. The second end of the first rod body 11 is inserted into the first end of the extension rod 13, and the second end of the extension rod 13 is inserted into the first end of the second rod body 12. The provision of the extension rod 13 allows the length of the first body 10 to be adjustable, enabling different extension rods 13 to be replaced according to the needs of the patient, to further enhance the fit of the sacral prosthesis. In this embodiment, the extension posts include different length dimensions, and each patient can select the extension posts with different length dimensions according to corresponding data measured in real time in the operation, so as to realize free assembly of the sacral prosthesis in the operation, without customization, solve the problem of poor timeliness caused by the need of customization of the sacral prosthesis, and also can well cope with the uncertainty of inconsistent bone defect range and preoperative planning caused by various factors in the operation, thereby further improving the suitability of the sacral prosthesis.

As shown in fig. 1 to 6, the side wall of the extension rod 13 is provided with a first avoiding hole 17, and the sacral prosthesis further comprises a second fastener, wherein the second fastener is arranged through the first avoiding hole 17 to be in abutting fit with the second end of the first rod body 11. The first avoidance hole 17 can avoid the second fastener, so that one end of the second fastener can be abutted with the second end of the first rod body 11, and the extension rod 13 can be in rotation-preventing fit with the first rod body 11.

As shown in fig. 1 to 6, the lateral wall of the second rod body 12 is provided with a second avoidance hole, and the sacral prosthesis further comprises a third fastener, wherein the third fastener is arranged in the second avoidance hole in a penetrating manner so as to be in butt fit with the first end of the second rod body 12. The second avoidance hole can avoid the third fastener, so that one end of the third fastener can be abutted with the first end of the second rod body 12, the extension rod 13 can be in rotation-stopping fit with the second rod body 12, and the orientation of the connecting inclined plane 151 on the second rod body 12 can be fixed.

As shown in fig. 4, the diameter of the second end of the first rod 11 gradually decreases from the first end of the first rod 11 to the second end of the first rod 11, the first end of the extension rod 13 is provided with a first tapered hole 18 that is in plug-in fit with the second end of the first rod 11, and the first tapered hole 18 gradually decreases from the first end of the extension rod 13 to the second end of the extension rod 13. Thus, the second end of the first rod 11 can be inserted into the extension rod 13 more stably and reliably by using the taper fit. When the first rod body 11 is in plug-in fit with the extension rod 13, the axis of the first rod body 11 coincides with the axis of the extension rod 13, so that biomechanical conduction of original pelvic anatomy of a human body is met, and the structural strength of the sacral prosthesis is improved.

As shown in fig. 4, the diameter of the second end of the extension rod 13 gradually decreases from the first end of the extension rod 13 to the second end of the extension rod 13, the first end of the second rod body 12 is provided with a second tapered hole 19 that is in plug-fit with the second end of the extension rod 13, and the second tapered hole 19 gradually decreases from the first end of the second rod body 12 to the second end of the second rod body 12. Thus, the first end of the second rod body 12 can be more stable and reliable in plug-in fit with the extension rod 13 by utilizing the taper fit. When the second rod body 12 is in plug-in fit with the extension rod 13, the axis of the second rod body 12 coincides with the axis of the extension rod 13, so that biomechanical conduction of the original pelvis anatomy of a human body is met, and the structural strength of the sacrum prosthesis is improved.

As shown in fig. 1 to 6, the first lumbar vertebrae connection part 14 includes a second screw hole 141 and a second porous structure 142 provided on a side wall of the first body 10, the second porous structure 142 being in contact engagement with the lumbar vertebrae 40. The second screw hole 141 penetrates the sidewall of the first body 10 and the second porous structure 142. The provision of the second porous structure 142 enables the lumbar spine 40 to grow into the second porous structure 142, improving the long-term stability of the connection of the lumbar spine 40 to the first lumbar connection 14. The sacral prosthesis further includes a second screw that is threaded through the second screw hole 141 to fixedly connect the first body 10 with the lumbar vertebra 40. The provision of the second screw hole 141 and the second screw makes the connection between the first body 10 and the lumbar vertebrae 40 more reliable and stable.

As shown in fig. 7, the first screw includes a screw head and a screw shaft, and the first screw hole 152 includes a through hole section 1521 that is recessed from the screw shaft and a counter bore section 1522 that mates with the screw head stop, the through hole section 1521 being in communication with the counter bore section 1522. The counterbore section 1522 tapers in diameter from the exterior of the first body 10 to the through bore section 1521 to enable the first screw to oscillate within the first screw bore 152. In this way, the angle of the first screw within the first screw hole 152 is adjustable after adjusting the angle between the first body 10 and the second body 20, making the connection of the first screw to the ilium 50 more reliable. In the present embodiment, the second screw hole 141 has the same structure as the first screw hole 152.

The inventors have found that posterior approach total sacrectomy procedures are generally selected for treatment of sacral tumors according to the patient's condition. The operation mode seriously damages the weight bearing structure of the human body. After the sacrum is resected, the upper body of the person above the lumbar vertebra 40 and the ilium 50 at the two sides of the residual pelvis are not connected in a bone way, the weight of the whole upper body cannot be transmitted to the lower limb through the pelvis, and the person cannot stand and walk. This abnormally increased range of motion between the torso and lower extremities results in excessive nerve root stretch and increased nerve irritation. Therefore, the lumbar vertebrae 40 are fixed clinically by using posterior pedicle screws, the ilium 50 is fixed by using pedicle screws on both sides of the ilium 50, and the two screws are connected by means of titanium rods, thereby connecting the trunk and the pelvis. However, this mechanical fixation does not reconstruct the sacrum and has the following problems: larger cavities are formed locally after removal of the sacrum, and if the sacral prosthesis is not implanted, residual cavities and effusions can exist for a long time, which is easy to cause infection. After the sacrum is resected, pelvic internal organs such as rectum and colon are herniated to the rear side, namely the back side, and the patient is caused to have dysuria. The screw is mechanically connected with the bone, bone ingrowth can not be carried out between the screw and the bone, final biological healing can be achieved, and long-term movement inevitably leads to the extraction of the screw from the bone and the fracture of the titanium rod or the screw. All of the above problems increase the post-operative infection rate and the risk of re-surgery, resulting in the inability of the patient to stand and walk. The traditional reconstruction mode has long operation time, cannot completely imitate the original biomechanical structure, is difficult to meet biomechanical conduction of the original pelvis anatomy of a human body, has insufficient mechanical supporting force, and is easy to cause bone defect, bone grafting absorption and easy to break or loosen. And the traditional fixing system of the nail rod and the lateral connecting block is easy to break and loose, and the problem of lumbar vertebra 40 sinking and pelvic ring separation can also occur.

The sacral prosthesis according to the present embodiment can be applied to a patient after a sacrum and a portion of ilium 50 resection operation, and can be used for stabilizing the pelvis. The upper end of the sacral prosthesis in this embodiment is attached to the lumbar spine 40 and left and right to the ilium 50. The sacral prosthesis is designed to have a curvature angle that corresponds to the physiological curvature of the sacrum.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sacral prosthesis, comprising:

a first main body (10), wherein a first lumbar vertebra connecting part (14) is arranged at a first end of the first main body (10), and a first ilium connecting part (15) is arranged at a second end of the first main body (10);

a second main body (20), wherein a first end of the second main body (20) is provided with a second lumbar vertebra connecting part (21), and a second end of the second main body (20) is provided with a second ilium connecting part (22);

wherein the first end of the first main body (10) is connected with the first end of the second main body (20) in an angle adjustable and detachable way.

2. The sacral prosthesis of claim 1, wherein the first end of the first body (10) is provided with a first end-toothed disc (16) disposed adjacent the first lumbar connection (14), the first end of the second body (20) is provided with a second end-toothed disc (23) disposed adjacent the second lumbar connection (21), the first end-toothed disc (16) being meshably engaged with the second end-toothed disc (23), the sacral prosthesis further comprising a first fastener (30) capable of locking or unlocking the first end-toothed disc (16) and the second end-toothed disc (23).

3. The sacral prosthesis of claim 2 wherein,

the first main body (10) is of a rod-shaped structure, and a preset included angle is formed between the top surface of the first end fluted disc (16) and the axis of the first main body (10); and/or the number of the groups of groups,

the first end gear disc (16) comprises a first ratchet disc, and the second end gear disc (23) comprises a second ratchet disc capable of being meshed with the first ratchet disc.

4. The sacral prosthesis of claim 1, wherein the first body (10) is a rod-like structure, the first ilium connection (15) comprising a connection ramp (151) disposed at an angle to an axis of the rod-like structure, the connection ramp (151) being in contact engagement with the ilium (50).

5. The sacral prosthesis of claim 4 wherein,

the first ilium connection portion (15) further comprises a first screw hole (152) provided on the second end of the first body (10), the sacral prosthesis further comprises a first screw, the first screw is threaded through the first screw hole (152) to fixedly connect the first body (10) with the ilium (50);

a connecting protrusion (153) is arranged on the connecting inclined plane (151), and the connecting protrusion (153) can extend into the ilium (50); and/or, a first porous structure (154) is arranged on the connecting inclined plane (151), and the first porous structure (154) is in contact fit with the ilium (50).

6. The sacral prosthesis according to claim 4, wherein the first body (10) comprises a first rod (11) and a second rod (12), the second rod (12) being rotatably connected to the first rod (11) centering on the axis of the first rod (11), the first lumbar connection (14) being provided at a first end of the first rod (11), the second end of the first rod (11) being rotatably connected to a first end of the second rod (12), the connection ramp (151) being provided at a second end of the second rod (12) and being provided at an angle to the axis of the second rod (12).

7. The sacral prosthesis of claim 6 wherein,

the first body (10) further comprises an extension rod (13) detachably connected between the first rod body (11) and the second rod body (12);

the second end of the first rod body (11) is inserted into the first end of the extension rod (13), and the second end of the extension rod (13) is inserted into the first end of the second rod body (12).

8. The sacral prosthesis of claim 7 wherein,

a first avoiding hole (17) is formed in the side wall of the extension rod (13), and the sacral prosthesis further comprises a second fastener, wherein the second fastener penetrates through the first avoiding hole (17) to be in abutting fit with the second end of the first rod body (11); and/or the number of the groups of groups,

the lateral wall of the second rod body (12) is provided with a second avoidance hole, the sacrum prosthesis further comprises a third fastener, and the third fastener is arranged in the second avoidance hole in a penetrating mode to be in butt fit with the first end of the second rod body (12).

9. The sacral prosthesis of claim 7 wherein,

the diameter of the second end of the first rod body (11) gradually decreases from the first end of the first rod body (11) to the second end of the first rod body (11), a first conical hole (18) which is in plug-in fit with the second end of the first rod body (11) is arranged at the first end of the extension rod (13), the first conical hole (18) gradually decreases from the first end of the extension rod (13) to the second end of the extension rod (13), and when the first rod body (11) is in plug-in fit with the extension rod (13), the axis of the first rod body (11) coincides with the axis of the extension rod (13); and/or the number of the groups of groups,

the diameter of the second end of the extension rod (13) gradually decreases from the first end of the extension rod (13) to the direction of the second end of the extension rod (13), the first end of the second rod body (12) is provided with a second conical hole (19) which is in plug-in fit with the second end of the extension rod (13), the second conical hole (19) gradually decreases from the first end of the second rod body (12) to the direction of the second end of the second rod body (12), and when the second rod body (12) is in plug-in fit with the extension rod (13), the axis of the second rod body (12) coincides with the axis of the extension rod (13).

10. The sacral prosthesis of claim 1 wherein,

the first lumbar vertebra connecting part (14) comprises a second screw hole (141) and a second porous structure (142) arranged on the side wall of the first main body (10), and the second porous structure (142) is in contact fit with the lumbar vertebra (40); the second screw hole (141) penetrates through the side wall of the first main body (10) and the second porous structure (142);

the sacral prosthesis further comprises a second screw, and the second screw penetrates through the second screw hole (141) to fixedly connect the first main body (10) with the lumbar vertebra (40).

11. The sacral prosthesis of claim 5 wherein,

the first screw comprises a screw head and a screw rod, the first screw hole (152) comprises a through hole section (1521) avoiding the screw rod and a counter bore section (1522) matched with the screw head in a stopping way, and the through hole section (1521) is communicated with the counter bore section (1522);

the diameter of the counterbore section (1522) decreases gradually in a direction from the exterior of the first body (10) to the through bore section (1521) to enable the first screw to oscillate within the first screw bore (152).