Split anatomical radial head prosthesis

Abstract

The application discloses a split type anatomical radial head joint prosthesis, which comprises a radial head and a radial medullary needle, the radial medullary needle comprises a connecting head and a nail body, the connecting head is connected with the nail body, the axis of the connecting head intersects with the axis of the nail body, and the axes of the connecting head and the nail body are located in the same plane, the included angle between the axis of the connecting head and the axis of the nail body is consistent with the anatomical form of the human radial head, the connecting head is rotationally connected with the radial head, and the rotationally connected surface of the connecting head and the radial head is a spherical surface. The connecting head and the nail body have a certain included angle between the axes, so that the prosthesis is consistent with the anatomical form of the human radial head; meanwhile, the connecting head and the radial head are rotationally connected in the application, and the rotationally connected surface of the connecting head and the radial head is a spherical surface, so that the prosthesis can better adjust the connecting angle of the radial head and the radial medullary needle when implanted in an individual, and the individual difference of the case is maximally adapted, thereby improving the success rate of prosthesis implantation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of orthopedic implant devices, in particular to a split type anatomical shape radial head joint prosthesis. BACKGROUND

[0002] The radius is located on the lateral side of the forearm, and is divided into two ends, the upper end of which is enlarged and called the radial head, the articular concave on the head is associated with the humeral head; the surrounding annular articular surface is associated with the ulna; the lower part of the head is slightly thin and is called the radial neck, the inner and lower side of the neck has a protruding radial tuberosity, the radial body is in the shape of a two-edged column, and the inner side edge is a thin and sharp interosseous edge. The lower end is concave in front and convex in back, the outer side protrudes downward and is called the styloid process, the inner surface of the lower end has an articular surface, which is in the shape of a ulnar notch, associated with the ulnar head, and the lower surface has a wrist joint surface associated with the carpal bone. In cases of radial head defects or lesions caused by various reasons such as trauma and tumor removal, the normal function of the elbow joint can only be restored after tibial function training, after the radial head replacement prosthesis is implanted and organically combined with the surrounding tissues of the elbow.

[0003] Chinese patent application with publication number CN210114541U discloses a bone cement type radial head prosthesis, which comprises a radial head, a fixing cylinder, a radial medullary needle and a positioning plate. The radial head is set to be consistent with the replaced bad bone and is formed by 3D printing. The radial head is set to be stepped. The fixing cylinder is arranged on the step. The radial medullary needle is arranged below the radial head. The radial medullary needle is located in the fixing cylinder. The positioning plate is arranged on one side of the fixing cylinder. Chinese patent application with publication number CN205144797U discloses a radial head replacement prosthesis, which comprises a radial head and a radial medullary needle. The radial head is in the shape of a circular truncated cone. An end face of a large diameter end of the radial head is used as a joint surface and is inwardly recessed to form a spherical cap-shaped joint cavity. A spherical center of the spherical cap-shaped joint cavity is located on an axis of the radial medullary needle. An end of the radial medullary needle is provided with a connecting plane. The connecting plane is circular and has the same diameter as that of a small diameter end of the radial head. The small diameter end of the radial head and the connecting plane of the radial medullary needle are connected by a connecting piece. Chinese patent application with publication number CN113081398A discloses a radial head prosthesis based on three-position anatomical customization of a healthy radial proximal end, which comprises a radial head, a prosthesis stem and a neck ring. An upper end of the prosthesis stem is connected with a lower end of the radial head. The neck ring is sleeved outside the prosthesis stem and contacts the lower end of the radial head. The radial head comprises an inner radial head layer, an outer multi-through-hole radial layer connected with the inner radial head layer and an outer cartilage layer wrapped outside the outer multi-through-hole radial layer. An inner cartilage layer is arranged between the inner radial head layer and the outer cartilage layer. Chinese patent application with publication number CN209075040U discloses a radial head replacement prosthesis, which comprises a radial head and a radial medullary needle. The radial head is in the shape of a circular truncated cone with a vertical height of 5.5-8mm. An upper end of the radial head is a ring-shaped joint surface with a diameter of 16-20mm. The ring-shaped joint surface is inwardly recessed to form a joint cavity with a maximum depth of 1.6-1.9mm. A lower end of the radial head is a circular arc groove. The radial medullary needle has a length of 29-32mm. An upper end of the radial medullary needle has an adapter base which can be interference-fitted with the circular arc groove. A lower end of the radial medullary needle has a radial medullary needle body with a diameter of 4.8-8mm. The radial medullary needle body has an arc-shaped cutout with a minimum diameter of 4-6mm at a middle position.

[0004] The above prior art solutions are beneficial attempts for the development of radial head prosthesis technology. However, the radial head and the radial medullary needle are mostly coaxially arranged in the above technical solutions, which is different from the anatomical form of the radial head. The structure position is relatively fixed, the individual differences of cases are ignored, and the use requirements of all clinical cases cannot be fully met.

[0005] Therefore, how to change the status quo that the radial head prosthesis is different from the anatomical form of the radial head in the prior art and cannot meet the use requirements of all clinical cases has become a problem to be solved by those skilled in the art. SUMMARY

[0006] The present application aims to provide a split-type anatomical radial head joint prosthesis to solve the above-mentioned problems existing in the prior art, so that the radial head prosthesis can adapt to individual differences of cases to the greatest extent.

[0007] To achieve the above-mentioned purpose, the present application provides the following scheme: the present application provides a split-type anatomical radial head joint prosthesis, comprising a radial head and a radial stem, wherein:

[0008] The radial stem comprises a connecting head and a nail body, the connecting head is connected with the nail body, the axis of the connecting head intersects with the axis of the nail body, and the axes of the connecting head and the nail body are located in the same plane, and the included angle between the axis of the connecting head and the axis of the nail body is consistent with the anatomical shape of the human radial head.

[0009] The connecting head is rotationally connected with the radial head, and the rotationally connected surface of the connecting head and the radial head is a spherical surface.

[0010] Preferably, the connecting head is connected with the radial head by using a universal ball, the universal ball has a connecting groove matched with the connecting head, the connecting head extends into the connecting groove, the outer surface of the universal ball is a spherical surface, and the universal ball is rotationally connected with the radial head.

[0011] Preferably, the connecting head is a circular truncated cone structure, and the larger-diameter end of the connecting head is connected with the nail body.

[0012] Preferably, the radial head is connected with a bushing, the radial head is sleeved on the outside of the bushing, the bushing has a cavity matched with the universal ball, and the universal ball is rotationally arranged in the cavity.

[0013] Preferably, the cavity comprises a first cavity and a second cavity, the first cavity is in communication with the second cavity, the first cavity is a spherical cavity matched with the universal ball, and the second cavity is a circular truncated cone structure, and the smaller-diameter end of the second cavity is in communication with the first cavity.

[0014] Preferably, the bushing is made of high molecular polyethylene material.

[0015] Preferably, an annular protrusion is arranged at the connecting position of the connecting head and the nail body, and the annular protrusion is coaxially arranged with the nail body.

[0016] Preferably, the outer circumferential surface of the nail body is provided with a positioning groove, the length direction of the positioning groove is parallel to the axis of the nail body, the positioning groove extends to and penetrates the annular protrusion, and the positioning groove is a top-open U-shaped groove structure; the center line of the positioning groove is located in the plane determined by the axis of the connecting head and the axis of the nail body, and the positioning groove is located on the obtuse angle side formed by the intersection of the axis of the connecting head and the axis of the nail body.

[0017] Preferably, the end of the nail body away from the connecting head comprises a spherical surface structure.

[0018] Preferably, the radial head is a rounded truncated cone structure, the smaller-diameter end of the radial head is connected to the connecting head, and the larger-diameter end of the radial head has a recess and forms a spherical cap-shaped joint cavity.

[0019] The split anatomical form radial head joint prosthesis of the present application comprises a radial head and a radial medullary needle, the radial medullary needle comprises a connecting head and a nail body, the connecting head is connected to the nail body, the axis of the connecting head intersects with the axis of the nail body and the axes of the two are located in the same plane, the included angle between the axis of the connecting head and the axis of the nail body is consistent with the anatomical form of the human radial head; the connecting head is rotationally connected to the radial head, and the rotational connection surface of the connecting head and the radial head is a spherical surface.

[0020] The split anatomical form radial head joint prosthesis of the present application comprises a radial head and a radial medullary needle, the radial medullary needle comprises a connecting head and a nail body, the connecting head is connected to the nail body, the axis of the connecting head intersects with the axis of the nail body and the axes of the two are located in the same plane, the included angle between the axis of the connecting head and the axis of the nail body is consistent with the anatomical form of the human radial head; the connecting head is rotationally connected to the radial head, and the rotational connection surface of the connecting head and the radial head is a spherical surface. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0022] Figure 1 It is a structural schematic diagram of the split anatomical form radial head joint prosthesis of the present application.

[0023] Figure 2It is a front view schematic diagram of the radial medullary needle of the split type anatomical morphology radial head joint prosthesis of the application;

[0024] Figure 3 It is a right view schematic diagram of the radial medullary needle of the split type anatomical morphology radial head joint prosthesis of the application;

[0025] Figure 4 It is a structure schematic diagram of the universal ball of the split type anatomical morphology radial head joint prosthesis of the application;

[0026] Figure 5 It is a cross-sectional structure schematic diagram of the universal ball of the split type anatomical morphology radial head joint prosthesis of the application;

[0027] Figure 6 It is a structure schematic diagram of the bushing of the split type anatomical morphology radial head joint prosthesis of the application;

[0028] Figure 7 It is a cross-sectional structure schematic diagram of the bushing of the split type anatomical morphology radial head joint prosthesis of the application;

[0029] Figure 8 It is a cross-sectional structure schematic diagram of the radial head of the split type anatomical morphology radial head joint prosthesis of the application;

[0030] Wherein, 1 is the radial head, 2 is the radial medullary needle, 3 is the connecting head, 4 is the nail body, 5 is the universal ball, 6 is the connecting groove, 7 is the bushing, 8 is the mounting groove, 9 is the first cavity, 10 is the second cavity, 11 is the annular protrusion, 12 is the positioning groove, and 13 is the spherical crown-shaped joint cavity. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0032] The purpose of the application is to provide a split type anatomical morphology radial head joint prosthesis to solve the problems existing in the prior art, so that the radial head prosthesis can adapt to individual differences of cases to the maximum extent.

[0033] In order to make the above-mentioned purposes, characteristics and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0034] Please refer to Figures 1-8 , wherein, Figure 1 It is a structure schematic diagram of the split type anatomical morphology radial head joint prosthesis of the application,Figure 2 A front view schematic diagram of a radial medullary needle of the split-type anatomical radial head joint prosthesis of the present application, Figure 3 A right view schematic diagram of a radial medullary needle of the split-type anatomical radial head joint prosthesis of the present application, Figure 4 A structure schematic diagram of a universal ball of the split-type anatomical radial head joint prosthesis of the present application, Figure 5 A structure schematic diagram of a universal ball of the split-type anatomical radial head joint prosthesis of the present application, Figure 6 A structure schematic diagram of a bushing of the split-type anatomical radial head joint prosthesis of the present application, Figure 7 A structure schematic diagram of a bushing of the split-type anatomical radial head joint prosthesis of the present application, Figure 8 A structure schematic diagram of a radial head of the split-type anatomical radial head joint prosthesis of the present application.

[0035] The present application provides a split-type anatomical radial head joint prosthesis, comprising a radial head 1 and a radial medullary needle 2, wherein the radial medullary needle 2 comprises a connecting head 3 and a nail body 4, the connecting head 3 is connected with the nail body 4, the axis of the connecting head 3 intersects with the axis of the nail body 4 and the axes of the two are in the same plane, the included angle between the axis of the connecting head 3 and the axis of the nail body 4 is consistent with the anatomical form of the human radial head, the connecting head 3 is rotationally connected with the radial head 1, and the rotationally connected surface of the connecting head 3 and the radial head 1 is spherical.

[0036] The split-type anatomical radial head joint prosthesis of the present application, comprising a radial head 1 and a radial medullary needle 2, wherein the radial medullary needle 2 comprises a connecting head 3 and a nail body 4, the connecting head 3 is connected with the nail body 4, the axis of the connecting head 3 intersects with the axis of the nail body 4 and the axes of the two are in the same plane, the included angle between the axis of the connecting head 3 and the axis of the nail body 4 is consistent with the anatomical form of the human radial head, the connecting head 3 is rotationally connected with the radial head 1, and the rotationally connected surface of the connecting head 3 and the radial head 1 is spherical.

[0037] Specifically, the connecting head 3 is connected with the radial head 1 by using a universal ball 5, the universal ball 5 has a connecting groove 6 matched with the connecting head 3, the connecting head 3 extends into the connecting groove 6, the outer surface of the universal ball 5 is spherical, the universal ball 5 is rotationally connected with the radial head 1, the universal ball 5 is arranged between the connecting head 3 and the radial head 1, which facilitates the connection operation, and the connecting head 3 is connected with the universal ball 5 by insertion, thereby further improving the convenience of connection.

[0038] In the specific embodiment, the connecting head 3 is in a circular truncated cone structure, the larger-diameter end of the connecting head 3 is connected with the nail body 4, and the structure of the connecting groove 6 is matched with the connecting head 3.

[0039] More specifically, the radial head 1 is connected with a bushing 7, the radial head 1 has a mounting groove 8 matched with the bushing 7, the radial head 1 is sleeved outside the bushing 7, the bushing 7 has a cavity matched with the universal ball 5, the universal ball 5 is rotatably arranged in the cavity, the bushing 7 is arranged, and the connection convenience of the connecting head 3 and the radial head 1 is further improved. When the prosthesis is implanted, the universal ball 5, the bushing 7 and the radial head are sequentially mounted at the connecting head 3, and the connection angle is adjusted according to the position of the relevant joint surface of the case.

[0040] The cavity includes a first cavity 9 and a second cavity 10, the first cavity 9 is in communication with the second cavity 10, the first cavity 9 is spherical and matched with the universal ball 5, and the second cavity 10 is circular truncated cone-shaped, the smaller diameter end of the second cavity 10 is in communication with the first cavity 9, and when the prosthesis is implanted, the universal ball 5 is rotatably arranged in the first cavity 9. The second cavity 10 is circular truncated cone-shaped, and the opening diameter is large, so that the angle adjustment between the radial head 1 and the connecting head 3 is avoided. In other specific embodiments of the present application, the diameter of the second cavity 10 can also be adjusted to control the range of angle adjustment.

[0041] It should be further pointed out that the bushing 7 is made of high molecular polyethylene material, so that the bushing 7 has good biocompatibility and wear resistance, and also plays a role in buffering the force between the radial head 1 and the universal ball 5.

[0042] Further, an annular protrusion 11 is arranged at the connecting position of the connecting head 3 and the nail body 4, the annular protrusion 11 is coaxially arranged with the nail body 4, and when the prosthesis is implanted, the annular protrusion 11 is pressed on the radial stump, so that the implantation positioning is facilitated.

[0043] In order to further improve the accuracy of prosthesis implantation, a positioning groove 12 is arranged on the outer circumferential surface of the nail body 4, the length direction of the positioning groove 12 is parallel to the axis of the nail body 4, the positioning groove 12 extends to the annular protrusion 11 and penetrates through the annular protrusion 11, and the positioning groove 12 is a U-shaped groove structure with an open top; the center line of the positioning groove 12 is located in the plane determined by the axis of the connecting head 3 and the axis of the nail body 4, and the positioning groove 12 is located on the obtuse angle side formed by the intersection of the axis of the connecting head 3 and the axis of the nail body 4. When the prosthesis is implanted, the positioning groove 12 can facilitate positioning during implantation, and also can avoid radial rotation of the radial bone marrow needle 2 after the prosthesis is installed, so as to ensure the success rate of prosthesis implantation.

[0044] It should be further pointed out that the end of the nail body 4 away from the connecting head 3 includes a spherical surface structure, which avoids unnecessary harm to the human body caused by the nail body 4 during prosthesis implantation.

[0045] Further, the radial head 1 is a reverse-tapered table structure, the smaller-diameter end of the radial head 1 is connected with the connecting head 3, and the larger-diameter end of the radial head 1 has a recess and forms a spherical-cap-shaped joint cavity 13, facilitating the connection of the prosthesis with other joints of the human body.

[0046] The split anatomical form radial head joint prosthesis of the present application, when performing prosthesis implantation, removes the radial head of the case, installs the pin body 4 according to the angle and position of the connecting head 3 matched with the radial head, presses the annular protrusion 11 on the radial stump, and then sequentially installs the universal ball 5, the bushing 7 and the radial head 1 at the connecting head 3, adjusts the angle of the spherical-cap-shaped joint cavity 13 according to the position of the relevant joint surface of the case, and completes the implantation. The split anatomical form radial head joint prosthesis of the present application, aiming at different individual cases, adjusts the connection angle of the split structure, so that the prosthesis maximally adapts to the individual differences of the cases, and is beneficial to the rehabilitation of the cases.

[0047] The principles and implementation modes of the present application are described by applying specific examples in the present application, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the field, according to the idea of the present application, the specific implementation modes and application ranges will be changed. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A split-type anatomical shape radial head joint prosthesis, comprising a radial head and a radial stem, characterized in that: the radial stem comprises a connecting head and a stem body, the connecting head is connected with the stem body, the axis of the connecting head intersects with the axis of the stem body and the axes of the connecting head and the stem body are in the same plane, the included angle between the axis of the connecting head and the axis of the stem body is consistent with the anatomical shape of the human radial head; the connecting head is rotatably connected with the radial head, and the rotatable connecting surface of the connecting head and the radial head is a spherical surface; the connecting head is connected with the radial head by a universal ball, the universal ball has a connecting groove matched with the connecting head, the connecting head extends into the connecting groove, the outer surface of the universal ball is a spherical surface, and the universal ball is rotatably connected with the radial head.

2. The split anatomic shaped radial head prosthesis of claim 1, wherein: The connecting head is a circular truncated cone structure, and the larger diameter end of the connecting head is connected with the stem body.

3. The split anatomic shaped radial head prosthesis of claim 1, wherein: The radial head is connected with a bushing, the radial head is sleeved on the outside of the bushing, the bushing has a cavity matched with the universal ball, and the universal ball is rotatably arranged in the cavity.

4. The split anatomic shaped radial head prosthesis of claim 3, wherein: The cavity comprises a first cavity and a second cavity, the first cavity is communicated with the second cavity, the first cavity is a spherical shape matched with the universal ball, and the second cavity is a circular truncated cone shape, and the smaller diameter end of the second cavity is communicated with the first cavity.

5. The split anatomic shaped radial head prosthesis of claim 3, wherein: The bushing is made of high molecular polyethylene material.

6. The split anatomic shaped radial head prosthesis of claim 1, wherein: An annular protrusion is arranged at the connecting position of the connecting head and the stem body, and the annular protrusion is coaxially arranged with the stem body.

7. The split anatomic shaped radial head prosthesis of claim 6, wherein: A positioning groove is arranged on the outer peripheral surface of the stem body, the length direction of the positioning groove is parallel to the axis of the stem body, the positioning groove extends to the annular protrusion and penetrates through the annular protrusion, and the positioning groove is a U-shaped groove structure with an open top; the center line of the positioning groove is located in the plane determined by the axis of the connecting head and the axis of the stem body, and the positioning groove is located on the obtuse angle side formed by the intersection of the axis of the connecting head and the axis of the stem body.

8. The modular, anatomically shaped radial head prosthesis of any of claims 1-7, wherein: The end of the stem body away from the connecting head comprises a spherical surface structure.

9. The modular, anatomically shaped radial head prosthesis according to any one of claims 1 to 7, characterized in that: The radial head is a reverse circular truncated cone structure, the smaller diameter end of the radial head is connected with the connecting head, and the larger diameter end of the radial head has a recess and forms a spherical cap-shaped joint cavity.

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