Elbow joint surface replacement prosthesis

Abstract

The present invention relates to the technical field of artificial prostheses, and particularly to a surface replacement prosthesis for the elbow joint. The surface replacement prosthesis for the elbow joint includes: a prosthetic elbow joint head, on which an installation groove is formed, and the installation groove is installed at the distal end of the humerus; a connecting portion, one end of which is connected to the prosthetic elbow joint head, and the other end extends along the proximal end of the humerus; and a bone grafting groove, which is arranged in the installation groove and is used for accommodating implanted bone fragments. The surface replacement prosthesis for the elbow joint provided by the present invention does not limit the degree of freedom of the patient's elbow joint and solves the problem of limited movement of the traditional elbow joint; moreover, when using this surface replacement prosthesis for the elbow joint, the amount of osteotomy of the patient's elbow joint is small, which is beneficial to the recovery and later revision of the patient's elbow joint; in addition, a bone grafting groove is also provided for implanting bones into the bone grafting groove to supplement the patient's bone mass, which is beneficial to reducing the weight of the elbow joint part, improving the patient's comfort, and after long-term recovery, the bones in the bone grafting groove can grow together with the humerus, thereby restoring the normal shape and function of the humerus.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial prostheses, and particularly to an elbow joint surface replacement prosthesis. Background Art

[0002] Elbow joint prosthesis replacement is applicable to patients with severely damaged joint structures. The design of elbow joint prostheses must take into account the functional anatomy and biomechanical properties of the elbow.

[0003] However, for existing total elbow joint replacement prostheses, the amount of osteotomy during replacement is large and the trauma is significant, resulting in serious bone loss and being unfavorable for the recovery of the patient's elbow; moreover, the degree of freedom of the elbow is restricted, causing the arm to be unable to twist freely; in addition, existing elbow joint replacement prostheses are relatively heavy, which greatly affects the comfort of the patient. Summary of the Invention

[0004] In view of this, in response to the above technical problems, it is necessary to provide an elbow joint surface replacement prosthesis that has no impact on the degree of freedom of the patient's elbow joint, is light in weight, and helps to restore the normal shape and function of the humerus.

[0005] An elbow joint surface replacement prosthesis provided by the present invention includes:

[0006] A prosthetic elbow joint head; an installation groove is formed on the prosthetic elbow joint head, and the installation groove is installed at the distal end of the humerus; wherein, the distal end of the humerus is the end close to the ulna;

[0007] A connecting portion, one end of the connecting portion is connected to the prosthetic elbow joint head, and the other end extends along the proximal end of the humerus; and

[0008] A bone grafting groove, which is arranged in the installation groove for accommodating bone fragments.

[0009] In this application, the prosthetic elbow joint head is provided to be used with the articular surface part of the distal humerus of the replacement patient, and the osteotomy amount of the patient's humerus is extremely small, so as to retain ligaments, periosteum, etc. around the patient's elbow joint, maximize the integrity of the elbow bone structure of the patient, facilitate the later recovery of the patient's elbow, and reduce the infection rate; after long-term use of the elbow joint, wear may occur. By using the elbow joint surface replacement prosthesis provided in this application, the osteotomy amount of the patient's humerus is small, so that the elbow joint can be revised and replaced again after wear, while it is difficult to revise again in the prior art with a large osteotomy amount; in addition, compared with the traditional elbow joint step and non-hinged total elbow joint prosthesis in the prior art, in this application, through the replacement of the articular surface of the prosthetic elbow joint head with the distal humerus of the patient and the connection and fixation with the patient's humerus through the connecting part, the freedom degree of the patient's elbow is not restricted, ensuring that the patient can move freely; more preferably, in this application, by setting bone grafting grooves, bone grafting grooves are set at positions where the humeral joint of the patient is severely damaged and the osteotomy amount is large, for implanting bones or bone fragments of the patient himself, to increase the bone mass of the patient. After long-term recovery, the bones in the bone grafting grooves can grow together with the patient's humerus, so as to restore the normal shape and function of the patient's humerus; and compared with the method of filling metal materials in the prior art, filling bones is beneficial to reducing the weight of the elbow joint part and improving the comfort of the patient.

[0010] In one embodiment, ligament suture holes are formed in the bone grafting groove.

[0011] With such a setting, the suture passes through the ligament suture hole, and the ligament on the patient's humerus can be sutured and fixed on the bone grafting groove, so that the ligament contacts and grows together with the bones in the bone grafting groove and / or the bones of the osteotomy part of the humerus, which is beneficial to the normal recovery of the patient's elbow.

[0012] In one embodiment, the elbow joint surface replacement prosthesis further includes at least one baffle, and the baffle is installed in the installation groove to enclose and form the bone grafting groove.

[0013] With such a setting, the bone grafting groove is formed by enclosing the baffle with the groove wall of the installation groove and / or the side wall of the humerus, making full use of the groove wall of the installation groove and / or the side surface of the humerus, reducing the number of baffles used, and thus the weight of the elbow joint surface replacement prosthesis, and improving the comfort of the patient.

[0014] In one embodiment, the baffle is in a hollow structure.

[0015] With such a setting, the bones in the bone grafting groove can be exposed, so that the ligaments on the humerus and the humeral bones contact the bone fragments in the bone grafting groove, promoting the growth of the bone fragments in the bone grafting groove together with the humerus and ligaments, improving the recovery speed of the patient, which is particularly important for the patient.

[0016] In one embodiment, the prosthetic elbow joint head, the bone grafting groove, and the connecting portion are integrally formed.

[0017] With such a setting, the overall performance of the elbow joint surface replacement prosthesis is better, the connection strength between the prosthetic elbow joint head, the bone grafting groove, and the connecting portion is higher, and integral forming can omit the connecting members between the three, simplify the structure of the elbow joint surface replacement prosthesis, and further reduce the weight, processing difficulty, and processing cost of the elbow joint surface replacement prosthesis.

[0018] In one embodiment, the connecting portion includes an inner column connecting plate and an outer column connecting plate.

[0019] It can be understood that the human humerus has an inner column and an outer column. By setting the inner column connecting plate and the outer column connecting plate to be respectively connected and fixed to the inner column and the outer column, the connection strength between the connecting portion and the humerus is improved, and it is ensured that the change in the biomechanical properties of the humerus after connection is small, improving the patient's comfort.

[0020] In one embodiment, one ends of the inner column connecting plate and the outer column connecting plate away from the prosthetic elbow joint head are connected as a whole.

[0021] With such a setting, it is beneficial to reduce the volume and weight of the connecting portion, thereby reducing the volume and weight of the elbow joint surface replacement prosthesis, which is especially suitable for patients with thinner bones.

[0022] In one embodiment, a plurality of fixing holes are formed in the connecting portion.

[0023] With such a setting, the inner column connecting plate and the outer column connecting plate are respectively fixedly connected to the humerus by a fastener passing through the fixing hole, improving the connection strength between the connecting portion and the humerus, and also preventing loosening or even detachment between the elbow joint surface replacement prosthesis and the humerus during use.

[0024] In one embodiment, the fixing hole is a kidney-shaped hole.

[0025] It can be understood that the fixing hole is a kidney-shaped hole. When the fastener is initially tightened, the kidney-shaped hole can change the direction of the pre-tightening force, so that the elbow joint surface replacement prosthesis has a pre-tightening force along the bone line direction during tightening, improving the stability of the elbow joint surface replacement prosthesis at the initial stage of installation and preventing the elbow joint surface replacement prosthesis from shifting or loosening during installation.

[0026] In one embodiment, a convex platform is provided on a side surface of the connecting portion facing the humerus.

[0027] It is understandable that by providing the boss, when the boss abuts against the surface of the humerus, a gap is formed between the surface of the humerus and the side of the connecting portion facing the humerus, thereby reducing the periosteal stripping of the surface of the humerus, increasing the blood supply to the surface of the humerus, and improving the recovery speed of the humerus.

[0028] The beneficial effects of an elbow joint surface replacement prosthesis provided by the present invention compared with the prior art are as follows:

[0029] The elbow joint surface replacement prosthesis provided in the present application has a prosthetic elbow joint head sleeved on the distal end of the humerus and is connected to the humerus through a connecting portion. This elbow joint surface replacement prosthesis is only fixedly connected to the humerus and is not connected to other bones of the elbow, thus not restricting the freedom of movement of the patient's elbow joint and having the same freedom of movement as a normal elbow joint, ensuring the flexible movement of the patient's elbow joint;

[0030] The elbow joint surface replacement prosthesis provided in the present application only replaces a part of the articular surface of the humerus, with less osteotomy, which is beneficial for the patient's recovery and later revision;

[0031] More preferably, the present application is also provided with a bone grafting groove. For patients with a large amount of joint defect, by implanting other bones or the patient's own autologous bone into the bone grafting groove, the bone mass in this area of the patient can be supplemented. After long-term recovery, the bones in the bone grafting groove can grow together with the humerus, so as to restore the normal shape and function of the humerus as much as possible; and by implanting bones in the bone grafting groove, compared with the method of filling metal materials in the prior art, filling bones is beneficial for reducing the weight of the joint part and improving the comfort of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of an elbow joint surface replacement prosthesis in an embodiment provided by the present invention.

[0033] Figure 2 It is a side view of an elbow joint surface replacement prosthesis in an embodiment provided by the present invention.

[0034] Figure 3 It is a schematic structural diagram of an elbow joint surface replacement prosthesis in another embodiment provided by the present invention.

[0035] Figure 4 It is a schematic structural diagram of an elbow joint surface replacement prosthesis in another embodiment provided by the present invention.

[0036] In the figure, 100, elbow joint surface replacement prosthesis; 10, prosthetic elbow joint head; 11, mounting groove; 12, bone grafting groove; 121, ligament suture hole; 122, baffle; 20, connecting portion; 21, medial column connecting plate; 22, lateral column connecting plate; 23, fixing hole; 24, boss. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] It should be noted that when a component is referred to as being "mounted on" another component, it can be directly mounted on the other component or there may also be an intermediate component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component at the same time. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there may be an intermediate component at the same time.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0040] Please refer to Figures 1-4 , an elbow joint surface replacement prosthesis 100 provided by the present invention, the elbow joint surface replacement prosthesis 100 includes a prosthesis elbow joint head 10, a connecting portion 20, and a bone grafting groove 12. Among them, an installation groove 11 is formed on the prosthesis elbow joint head 10, and the installation groove 11 is installed on the distal end of the humerus, where the distal end of the humerus is the end close to the ulna; one end of the connecting portion 20 is connected to the prosthesis elbow joint head 10, and the other end extends along the proximal end of the humerus and is connected to the humerus; and the bone grafting groove 12 is arranged in the installation groove 11, and the bone grafting groove 12 is used for accommodating bone fragments implanted into the prosthesis elbow joint head 10.

[0041] The elbow joint surface replacement prosthesis 100 provided in this application is sleeved on the distal end of the humerus through the prosthesis elbow joint head 10 and is connected to the humerus through the connecting part 20 without being fixedly connected to the ulna. Therefore, the degree of freedom of the patient's elbow joint is not restricted, and it has the same degree of freedom of movement as a normal elbow joint, ensuring flexible movement of the patient's elbow joint. Moreover, this application is only fixedly connected to the humerus through the connecting part 20 without performing operations within the bone marrow cavity of the patient, thus effectively reducing the probability of deep infection. Furthermore, the elbow joint surface replacement prosthesis 100 only replaces the surface part of the humeral joint, with less osteotomy, retains the ligaments around the patient's elbow joint, and maximally retains the integrity of the bone structure of the patient's elbow limb, facilitating the patient's recovery. In addition, due to less osteotomy, if there is wear in the later stage of elbow joint use, secondary revision can be performed.

[0042] More preferably, for patients with a large amount of joint defect, by setting the bone graft groove 12 and implanting bones into the bone graft groove 12, the bone mass in this area of the patient can be supplemented. After long-term recovery, the bones in the bone graft groove 12 can grow together with the humerus, so as to restore the normal shape and function of the humerus as much as possible. And by implanting bones in the bone graft groove 12, compared with the method of filling metal materials in the prior art, filling bones is beneficial to reducing the weight of the elbow joint part and improving the patient's comfort.

[0043] Specifically, the shape of the outer surface of the prosthesis elbow joint head 10 is the same as or similar to the shape of the joint surface of the distal end of the humerus, and the contact surface between the prosthesis elbow joint head 10 and the proximal joint of the ulna is a smooth surface, ensuring that the prosthesis elbow joint head 10 can be connected to the ulna in the same way as a normal elbow joint of the human body, ensuring that the replaced elbow joint has the same degree of freedom as a normal elbow joint and making the joint movement unrestricted.

[0044] Furthermore, the surface of the prosthesis connecting part and the inner surface of the installation groove can be set as a rough surface, and the rough surface is beneficial to increasing the friction force between the connecting part or the installation groove 11 and the surface of the humerus, making the elbow joint surface replacement prosthesis 100 not easy to slip off.

[0045] Furthermore, the inner surface of the installation groove 11 is a porous structure, thus forming an uneven porous surface, increasing the contact area between the installation groove 11 and the human bone, being beneficial to the growth of the human own bone and the prosthesis elbow joint head 10 together, improving the connection strength between the prosthesis elbow joint head 10 and the human elbow joint, and enhancing the stability of the connection between the two.

[0046] As a preference, refer to Figure 1 , the installation groove 11 is a U-shaped groove, and the U-shaped groove fits better with the shape of the elbow joint after osteotomy of the human body, facilitating the installation of the prosthesis elbow joint head 10 on the human humerus and making the installation more stable. Of course, in other embodiments, the shape of the installation groove 11 is not limited to the above description or shown in the figure, and can be specifically determined according to the osteotomy shape of the patient's humerus and the installation situation of the humerus.

[0047] Further, please refer to Figure 1 , the elbow joint surface replacement prosthesis 100 further includes at least one baffle 122. The baffle 122 is installed in the installation groove 11 to enclose and form a bone grafting groove 12, where the bone grafting groove 12 is used to fill with bone or the patient's own bone fragments. Specifically, when the number of baffles 122 is one, the baffle 122, the two side walls of the installation groove 11, and the side surface of the human humerus installed in the installation groove 11 enclose to form the bone grafting groove 12, making full use of the wall area of the installation groove 11 and the area of the humerus, reducing the number of baffles 122 provided, and thus reducing the weight of the elbow joint surface replacement prosthesis 100. Of course, in other embodiments, the number of baffles 122 provided is not limited to the above. For example, when the number of baffles 122 is two, the two baffles 122 and the two side walls of the installation groove 11 enclose to form the bone grafting groove 12; for another example, when the number of baffles 122 is three, the three baffles 122 and the side wall of one side of the installation groove 11 or the side surface of the human humerus enclose to form the bone grafting groove 12; for another example, when the number of baffles 122 is four, the four baffles 122 are connected in sequence to enclose and form the bone grafting groove 12.

[0048] Among them, the position where the bone grafting groove 12 is provided and the formed manner are flexibly determined according to the osteotomy situation of the human humerus. For example, when a part of the human humerus is severely damaged, resulting in a large osteotomy amount in this part, the bone grafting groove 12 can be provided at the corresponding position of this part to correspondingly fill the bone amount of this part, so that the human humerus grows together with the bone filled in the bone grafting groove 12, thereby restoring the normal shape and function of the humerus.

[0049] It should be noted that the present application does not limit the number of bone grafting grooves 12 provided. For example, one can be provided, or multiple can be provided.

[0050] Preferably, please continue to refer to Figure 1 , the baffle 122 is in a hollow structure. Thus, after long-term use, the bone filled in the bone grafting groove 12 can contact and grow together with the patient's own humerus, and the patient's ligaments can also fully contact and grow together with the bone in the bone grafting groove 12 through the hollow baffle 122, which is beneficial to the growth together and recovery of the elbow joint surface replacement prosthesis 100 and the patient's humerus, and improves the connection strength between the two.

[0051] Please refer to Figure 1 , more preferably, the bone grafting groove 12 is provided with ligament suture holes 121. The ligament suture holes 121 provide a threading part for suturing ligaments. When the doctor sutures the ligaments, the suture passes through the ligament suture holes 121 and fixes the ligaments at this position, so that the patient's own ligaments can contact and grow together with the patient's own humerus and / or the bone in the bone grafting groove 12, solving the problem that the ligaments cannot contact and grow together with the prosthesis.

[0052] Furthermore, the number of ligament suture holes 121 is multiple, and the multiple ligament suture holes 121 are spaced apart on the bone graft groove 12 to provide multiple wire threading sites for facilitating the fixation of ligaments.

[0053] Combined with the structure of the hollow baffle 122, the ligament suture hole 121 can be a hole formed by hollowing out on the baffle 122. Of course, it can also be a hole separately opened on the baffle 122, and no limitation is made here.

[0054] Please refer to Figures 1-4 , the prosthetic elbow joint head 10, the bone graft groove 12 and the connecting part 20 are integrally formed. The elbow joint surface replacement prosthesis 100 is integrally formed as a whole, with better overall performance, better connection strength between the connecting part 20 and the prosthetic elbow joint head 10, and it is beneficial to simplify the structure of the elbow joint surface replacement prosthesis 100, omit the connecting components between the three, and further reduce the weight, processing difficulty and processing cost of the elbow joint surface replacement prosthesis 100.

[0055] Specifically, the elbow joint surface replacement prosthesis 100 product provided by the present application is processed and formed by integral 3D printing. The product is designed by mirroring the elbow joint on the healthy side of the patient. The 3D model of the elbow joint is reconstructed from CT scan data. The elbow joint surface replacement prosthesis 100 product obtained in this way has a very high adaptability to the patient's elbow joint, improving the patient's comfort. Of course, in other embodiments, the prosthetic elbow joint head 10, the bone graft groove 12 and the connecting part 20 can also be separately manufactured and then connected.

[0056] Refer to Figure 2 , 3 , the connecting part 20 includes an inner column connecting plate 21 and an outer column connecting plate 22. One end of the inner column connecting plate 21 is connected to the prosthetic elbow joint head 10, and the other end extends along the inner column of the humerus along the proximal end of the humerus and is fixed on the inner column of the humerus; one end of the outer column connecting plate 22 is connected to the prosthetic elbow joint head 10, and the other end extends along the outer column of the humerus along the proximal end of the humerus and is fixed on the outer column of the humerus. By connecting and fixing the inner column connecting plate 21 and the outer column connecting plate 22 to the inner column and the outer column on the humerus respectively, the prosthetic elbow joint head 10 is stably installed at the distal end of the humerus, preventing the prosthetic elbow joint head 10 from loosening.

[0057] Furthermore, please continue to refer to Figure 2 , 3 , the bent shapes of the inner column connecting plate 21 and the outer column connecting plate 22 respectively correspond to the inner column and the outer column of the humerus, so that the biomechanical properties of the inner column connecting plate 21 and the outer column connecting plate 22 are basically the same as those of the corresponding inner column and outer column of the humerus.

[0058] As a preference, refer to Figure 3, one end of the inner column connecting plate 21 and the outer column connecting plate 22 away from the prosthetic elbow joint head 10 is connected as a whole, thereby reducing the volume and weight of the connecting part 20, which is especially suitable for patients with thinner bones.

[0059] In addition, refer to Figure 2 , a plurality of fixing holes 23 are formed in the connecting part 20. Specifically, the fixing holes 23 are formed in the inner column connecting plate 21 and the outer column connecting plate 22; when the humerus of the patient has not grown together with the elbow joint surface replacement prosthesis 100 during the initial installation, the inner column connecting plate 21 and the outer column connecting plate 22 are fastened to the humerus by inserting fasteners into the fixing holes 23, so as to improve the connection stability between the elbow joint surface replacement prosthesis 100 and the humerus of the patient. The fasteners can be screws or other fasteners, which are not limited here.

[0060] It should be noted that, refer to Figure 3 , the fixing hole 23 is a kidney-shaped hole, which can make the elbow joint surface replacement prosthesis 100 have a pre-tightening force along the bone line direction during the tightening process of the fastener, so as to improve the stability of the elbow joint surface replacement prosthesis 100 in the initial installation. Of course, in other embodiments, the shape of the fixing hole 23 is not limited to the shape described above or shown in the figure, and it can also be, for example Figure 2 the circular hole shown, or it can also be other shapes.

[0061] In one embodiment, refer to Figure 4 , a convex platform 24 is arranged on the side surface of the connecting part 20 facing the humerus. During installation, the convex platform 24 abuts against the surface of the humerus; by adding the convex platform 24, the contact area between the connecting part 20 and the humerus is reduced, so that there is a gap between the connecting part 20 and the side surface of the humerus, thereby reducing the periosteal stripping on the surface of the humerus, increasing the blood circulation on the surface of the humerus, so as to improve the recovery speed of the humerus and accelerate the growth of the humerus and the elbow joint surface replacement prosthesis 100.

[0062] Preferably, the convex platform 24 is arranged at the position of the fixing hole 23, and the fixing hole 23 penetrates through the convex platform 24. When the fastener is connected and tightened to the humerus through the fixing hole 23 and the convex platform 24, the convex platform 24 is tightly abutted against the side surface of the connecting part 20 facing the humerus. Of course, the position where the convex platform is arranged is not limited to the position described above, and it can be arranged at any position on the side surface of the connecting part 20 facing the humerus.

[0063] In addition, it should be noted that using words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above words have no special meaning, so it cannot be understood as a limitation to the protection scope of the present invention.

[0064] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0065] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present invention and are not used to limit the present invention. As long as appropriate changes and variations made to the above embodiments fall within the scope of the spirit of the present invention, they fall within the scope of protection required by the present invention.

Claims

1. An elbow joint surface replacement prosthesis, characterized in that, The elbow joint surface replacement prosthesis includes: A prosthetic elbow joint head, on which an installation groove is provided, and the installation groove is installed on the distal end of the humerus; wherein, the distal end of the humerus is the end close to the ulna; A connecting portion, one end of the connecting portion is connected to the prosthetic elbow joint head, and the other end extends along the proximal end of the humerus; and A bone grafting groove, which is arranged in the installation groove for accommodating bone fragments; The prosthetic elbow joint head is sleeved on the distal end of the humerus through the installation groove; The elbow joint surface replacement prosthesis further includes at least one baffle, and the baffle is installed in the installation groove for surrounding and forming the bone grafting groove; The baffle is in a hollow structure; The prosthetic elbow joint head, the bone grafting groove and the connecting portion are integrally formed.

2. The elbow joint surface replacement prosthesis according to claim 1, characterized in that, A ligament suture hole is provided on the bone grafting groove.

3. The elbow joint surface replacement prosthesis according to claim 1, wherein, The connecting portion includes an inner column connecting plate and an outer column connecting plate.

4. The elbow joint surface replacement prosthesis according to claim 3, wherein One ends of the inner column connecting plate and the outer column connecting plate far from the prosthetic elbow joint head are connected together.

5. The elbow joint surface replacement prosthesis according to claim 1, characterized in that A plurality of fixing holes are provided on the connecting portion.

6. The elbow joint surface replacement prosthesis according to claim 5, characterized in that, The fixing holes are waist-shaped holes.

7. The elbow joint surface replacement prosthesis according to claim 1, characterized in that, A boss is arranged on the side surface of the connecting portion facing the humerus.

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