Tibial prosthesis intramedullary positioning system

Abstract

The utility model discloses a tibial prosthesis intramedullary positioning system which comprises a tibial plateau prosthesis, an eccentric adjusting component and an intramedullary rod. The tibial plateau prosthesis comprises a plateau part and a stand column, the eccentric adjusting component comprises a first connecting part and a main body part, the first connecting part is arranged at the upper end of the main body part, the central axis of the first connecting part and the central axis of the main body part are parallel and spaced, and the first connecting part is coaxially pivoted to the stand column; the intramedullary rod comprises a second connecting part and a rod part, the second connecting part is arranged at the upper end of the rod part, the central axis of the second connecting part and the central axis of the rod part are parallel and spaced, and the second connecting part is coaxially pivoted to the main body part. The position and angle adjustment within the plane range is achieved through the eccentric adjusting component, the position of the intramedullary rod is made to be matched with the tibia marrow cavity, the optimal coverage of the tibia platform prosthesis osteotomy plane is achieved, and the good stress of the tibia extension rod is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to orthopedic surgical instrument positioning technical field, especially a tibial prosthesis intramedullary positioning system. BACKGROUND

[0002] In the traditional orthopedic surgery, the reamer is used to bluntly ream the marrow, and the instrument design (the reamer front section is passivated) is used to ensure the intramedullary passability, after the reaming is completed, if Figure 1 The anatomical features of the marrow cavity are not in the middle position of the osteotomy plane, and the selection of the tibial prosthesis cannot be fully matched through the single adjustment of the test model, so that the tibial plateau and the osteotomy surface are not matched after the tibial prosthesis is implanted, and the position and angle of the intramedullary extension rod are not matched with the marrow cavity, resulting in intramedullary pain. UTILITY MODEL CONTENT

[0003] The purpose of the present application is to provide a tibial prosthesis intramedullary positioning system to solve the problems raised in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A tibial prosthesis intramedullary positioning system, comprising:

[0006] A tibial plateau prosthesis, the tibial plateau prosthesis comprises a platform part and a column, the lower surface of the platform part is provided with the column, and the platform part is matched with the tibial osteotomy plane;

[0007] An eccentric adjusting member, the eccentric adjusting member comprises a first connecting part and a main body part, the first connecting part is arranged at the upper end of the main body part, the center axis of the first connecting part and the center axis of the main body part are arranged in parallel and are spaced apart, and the first connecting part is coaxially pivoted with the column;

[0008] An intramedullary rod, the intramedullary rod comprises a second connecting part and a rod part, the second connecting part is arranged at the upper end of the rod part, the center axis of the second connecting part and the center axis of the rod part are arranged in parallel and are spaced apart, and the second connecting part is coaxially pivoted with the main body part.

[0009] Optionally, the first connecting part comprises a first connecting column and a circle of first grooves on the side surface of the first connecting column, and the first axial limiting structure of the inner wall of the column is inserted into the first grooves.

[0010] Optionally, the second connecting part comprises a second connecting column and a circle of second grooves on the side surface of the second connecting column, and the second axial limiting structure of the inner wall of the main body part is inserted into the second grooves.

[0011] Optionally, the stand column is provided with a first connecting hole for inserting the first connecting column and a first side hole communicating the first connecting hole and the outer surface of the stand column, and the first side hole is connected with the first axial limiting structure, the front end of which can protrude from the inner surface of the stand column and be inserted into the first groove of the first connecting column.

[0012] Optionally, the first side hole is a first threaded hole, and the first axial limiting structure is a first screw, which can protrude from the inner surface of the stand column or be retracted into the first threaded hole by rotating the first screw.

[0013] Optionally, the main body part is provided with a second connecting hole for inserting the second connecting column and a second side hole communicating the second connecting hole and the outer surface of the main body part, and the second side hole is connected with the second axial limiting structure, the front end of which can protrude from the inner surface of the main body part and be inserted into the second groove.

[0014] Optionally, the second side hole is a second threaded hole, and the second axial limiting structure is a second screw, which can protrude from the inner surface of the main body part or be retracted into the second threaded hole by rotating the second screw.

[0015] Optionally, the distance between the central axis of the first connecting part and the central axis of the main body part ranges from 0 to 4 mm, and the distance between the central axis of the second connecting part and the central axis of the rod part ranges from 0 to 4 mm.

[0016] Optionally, the rod part includes a first rod and a second rod, the first rod is connected with the second connecting part, and the first rod and the second rod are detachably connected.

[0017] Optionally, the stand column is provided with a first connecting hole for inserting the first connecting column and a first side hole communicating the first connecting hole and the outer surface of the stand column, and the first side hole is connected with the first axial limiting structure, the front end of which can protrude from the inner surface of the stand column and be inserted into the first groove of the first connecting column.

[0018] In summary, the technical effects and advantages of the present application are as follows: the eccentric adjusting member is used to adjust the position and angle in the plane, the center of the bone cutting plane and the anatomical center of the tibial medullary cavity are determined, the position of the intramedullary rod is matched with the tibial medullary cavity, the corresponding tibial extension rod is selected based on the tibial prosthesis intramedullary positioning system, the best coverage of the tibial platform prosthesis bone cutting plane and the good stress of the tibial extension rod are realized, the intramedullary fixation of the tibial extension rod is improved, the service life of the prosthesis is prolonged, and the effective force transmission after the prosthesis is implanted and the stability of the prosthesis are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a schematic view of the anatomical center of the medullary cavity and the center of the bone cutting plane;

[0021] Figure 2 is a structure schematic view of the tibial prosthesis intramedullary positioning system in an embodiment of the present application Figure 1 ;

[0022] Figure 3 is a semi-sectional view of the tibial prosthesis intramedullary positioning system in an embodiment of the present application

[0023] Figure 4 is a structure schematic view of the tibial prosthesis intramedullary positioning system in an embodiment of the present application Figure 2 ;

[0024] Figure 5 is a use state view of the tibial prosthesis intramedullary positioning system inserted into the tibial medullary cavity in an embodiment of the present application

[0025] Figure 6 is a use state view of the tibial prosthesis intramedullary positioning system adjusted in place in an embodiment of the present application

[0026] Figure 7 is an installation schematic view of the tibial platform prosthesis and the tibial extension rod in an embodiment of the present application.

[0027] Among them:

[0028] 01, tibial extension rod; 1, tibial platform prosthesis; 11, platform part; 12, column; 121, first axial limiting structure; 122, first connecting hole; 123, first position sensor; 2, eccentric adjustment member; 21, first connecting part; 211, first connecting column; 212, first groove; 22, main body part; 221, second axial limiting structure; 222, second connecting hole; 3, intramedullary rod; 31, second connecting part; 311, second connecting column; 312, second groove; 32, rod part; 321, first rod; 322, second rod; 323, second position sensor. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the systems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0033] The present embodiment provides a tibial prosthesis intramedullary positioning system, which can be adjusted by the assembly cooperation of the tibial platform prosthesis and the eccentric adjustment member, and the appropriate tibial extension rod is selected, which is suitable for irregular tibial medullary cavity. For example Figures 2-7As shown, the tibial prosthesis intramedullary positioning system comprises a tibial platform prosthesis 1, an eccentricity adjustment member 2 and an intramedullary rod 3. The tibial platform prosthesis 1 comprises a platform part 11 and a column 12, the lower surface of the platform part 11 is provided with the column 12, and the platform part 11 is adapted to the tibial bone resection plane. The eccentricity adjustment member 2 comprises a first connecting part 21 and a main body part 22, the first connecting part 21 is arranged at the upper end of the main body part 22, the central axis of the first connecting part 21 and the central axis of the main body part 22 are parallel and spaced, and the first connecting part 21 is coaxially pivoted with the column 12. The intramedullary rod 3 comprises a second connecting part 31 and a rod part 32, the second connecting part 31 is arranged at the upper end of the rod part 32, the central axis of the second connecting part 31 and the central axis of the rod part 32 are parallel and spaced, and the second connecting part 31 is coaxially pivoted with the main body part 22.

[0034] In this embodiment, the tibial prosthesis intramedullary positioning system is provided with the eccentricity adjustment member 2, and the eccentricity adjustment member 2, the column 12 and the intramedullary rod 3 are all eccentrically designed and pivoted, which can realize stepless adjustment of the eccentric position of the intramedullary rod 3 relative to the column 12, so that the intramedullary rod 3 is matched with the medullary cavity, thereby selecting the tibial prosthesis matched with the tibial bone medullary cavity according to the relative position of the intramedullary rod 3 relative to the column 12 in the test model, thereby improving the medullary fixation of the tibial extension rod, prolonging the service life of the tibial prosthesis, and guaranteeing the force transmission and stability of the tibial prosthesis after implantation.

[0035] In this embodiment, the first connecting part 21 comprises a first connecting column 211 and a first groove 212 on the side surface of the first connecting column 211, and the first axial limiting structure 121 of the inner wall of the column 12 is inserted into the first groove 212, thereby realizing the connection of the eccentricity adjustment member 2 and the tibial platform prosthesis 1, and the 360° rotation of the eccentricity adjustment member 2 relative to the column 12 of the tibial platform prosthesis 1. Specifically, the column 12 is provided with a first connecting hole 122 and a first side hole, the first connecting hole 122 is used for inserting the first connecting column 211, the first side hole is connected with the first connecting hole 122 and the outer surface of the column 12, the first side hole is connected with the first axial limiting structure 121, the front end of the first axial limiting structure 121 can protrude from the inner surface of the column 12 and can be inserted into the first groove 212 of the first connecting column 211. The first connecting column 211 is inserted into the first connecting hole 122, and the first axial limiting structure 121 can be inserted into the first groove 212 of the first connecting column 211, thereby realizing the coaxial pivoting of the first connecting part 21 and the column 12. Preferably, in order to guarantee the stability of the pivoting of the first connecting part 21 and the column 12, the first side hole and the first axial limiting structure 121 are both at least two, for example, 2, 3 or 4, and the different first side holes are centrally symmetrical.

[0036] Optionally, the first side hole is a first threaded hole, and the first axial limiting structure 121 is a first screw. By rotating the first screw, the first screw can protrude from the inner surface of the stand 12 or retract into the first threaded hole. In this embodiment, the installation of the first axial limiting structure 121 is realized by threaded connection, so that the first connecting part 21 and the stand 12 are convenient to disassemble and assemble.

[0037] In this embodiment, the second connecting part 31 includes a second connecting column 311 and a second groove 312 on the side surface of the second connecting column 311. The second axial limiting structure 221 of the inner wall of the main body part 22 is inserted into the second groove 312, so that the intramedullary rod 3 is connected with the eccentric adjusting member 2, and the intramedullary rod 3 can rotate 360° relative to the eccentric adjusting member 2.

[0038] In this embodiment, the main body part 22 is provided with a second connecting hole 222 and a second side hole. The second connecting hole 222 is used for inserting the second connecting column 311. The second side hole is connected with the second connecting hole 222 and the outer surface of the main body part 22. The second axial limiting structure 221 is connected with the second side hole. The front end of the second axial limiting structure 221 can protrude from the inner surface of the main body part 22 and can be inserted into the second groove 312 of the second connecting column 311, so that the second connecting part 31 and the main body part 22 are coaxially pivoted.

[0039] The second side hole is a second threaded hole, and the second axial limiting structure 221 is a second screw. By rotating the second screw, the second screw can protrude from the inner surface of the main body part 22 or retract into the first threaded hole. In this embodiment, the installation of the second axial limiting structure 221 is realized by threaded connection, so that the second connecting part 31 and the main body part 22 are convenient to disassemble and assemble.

[0040] In this embodiment, the distance between the central axis of the first connecting part 21 and the central axis of the main body part 22 is in the range of 0-4mm, and the distance between the central axis of the second connecting part 31 and the central axis of the rod part 32 is in the range of 0-4mm. According to the structure of the tibial prosthesis intramedullary positioning system in this embodiment, the eccentric adjusting member 2 can rotate 360° relative to the stand 12, and the intramedullary rod 3 can rotate 360° relative to the eccentric adjusting member 2. Therefore, the distance between the central axis of the intramedullary rod 3 and the central axis of the stand 12 can be steplessly adjusted in the range of 0-8mm, so that the tibial prosthesis intramedullary positioning system can be adapted to the tibial medullary cavity.

[0041] As shown in Figure 2 and Figure 3 , the rod part 32 can be an integrally formed rod. Alternatively, as shown in Figure 4As shown, the rod part 32 includes a first rod 321 connected with the second connecting part 31 and a second rod 322, the first rod 321 and the second rod 322 are detachably connected, so that the second rod 322 can be replaced with different specifications according to the medullary cavity, so as to adapt to different medullary cavity shapes.

[0042] In this embodiment, the first position sensor 123 is built in the column 12, and the second position sensor 323 is arranged in the intramedullary rod 3, and the controller and the display are connected with the first position sensor 123 and the second position sensor 323, the controller is used to calculate the relative position of the first position sensor 123 and the second position sensor 323, and the display is used to display the relative position of the first position sensor 123 and the second position sensor 323. The relative position information of the column 12 and the intramedullary rod 3 can be obtained by the first position sensor 123 and the second position sensor 323, which has a guiding effect on the selection of the tibial lengthening rod.

[0043] The working process of this embodiment is as follows: Figure 5 As shown, by selecting a suitable tibial prosthesis intramedullary positioning system, the intramedullary rod 3 and the eccentric adjustment member 2 are sequentially and gradually inserted into the tibial medullary cavity, and the intramedullary rod 3 and the eccentric adjustment member 2 can automatically rotate relative to each other to adapt to the anatomical center of the tibial medullary cavity, as shown in Figure 6 As shown, as the tibial platform prosthesis 1 covers the tibial osteotomy plane to the maximum coverage, the tibial prosthesis intramedullary positioning system has been adjusted in place. The relative position information of the column 12 and the intramedullary rod 3 is obtained by the first position sensor 123 and the second position sensor 323, and a suitable eccentric tibial lengthening rod 01 is selected according to the relative position information, as shown in Figure 7 As shown, the tibial platform prosthesis 1 and the selected tibial lengthening rod 01 are installed together, and finally implanted, to achieve the best coverage of the tibial platform osteotomy plane and good stress of the tibial lengthening rod 01.

[0044] In summary, the eccentric adjustment member and the intramedullary rod of this embodiment realize the adjustment of the position and angle within the plane range, determine the center of the osteotomy plane and the anatomical center of the tibial medullary cavity, adapt the position of the tibial lengthening rod to the tibial medullary cavity, select the corresponding tibial lengthening rod based on the tibial prosthesis intramedullary positioning system, achieve the best coverage of the tibial platform prosthesis osteotomy plane and good stress of the tibial lengthening rod, improve the intramedullary fixation of the tibial lengthening rod, prolong the service life of the prosthesis, and ensure the effective force transmission and stability of the prosthesis after implantation.

[0045] It should be explained finally: above only is the preferred embodiment of the utility model and is not used for limiting the utility model, although the utility model has been explained in detail with reference to foregoing embodiment, for the skilled person in the art, it still can modify the technical scheme recorded in foregoing each embodiment or make equivalent replacement to part technical features, any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. A tibial prosthetic intramedullary positioning system, comprising: The application relates to a tibial platform prosthesis (1) comprising a platform part (11) and a post (12), the lower surface of the platform part (11) being provided with the post (12), the platform part (11) being adapted to a tibial osteotomy plane; an eccentricity adjusting member (2) comprising a first connecting part (21) and a main body part (22), the first connecting part (21) being arranged at the upper end of the main body part (22), the central axis of the first connecting part (21) and the central axis of the main body part (22) being parallel and spaced apart, the first connecting part (21) being coaxially pivoted with the post (12); and an intramedullary rod (3) comprising a second connecting part (31) and a rod part (32), the second connecting part (31) being arranged at the upper end of the rod part (32), the central axis of the second connecting part (31) and the central axis of the rod part (32) being parallel and spaced apart, the second connecting part (31) being coaxially pivoted with the main body part (22). The first connecting part (21) comprises a first connecting post (211) and a ring of first grooves (212) on the side of the first connecting post (211), and the first axial limiting structure (121) of the inner wall of the post (12) is inserted into the first grooves (212). The second connecting part (31) comprises a second connecting post (311) and a ring of second grooves (312) on the side of the second connecting post (311), and the second axial limiting structure (221) of the inner wall of the main body part (22) is inserted into the second grooves (312). The post (12) is provided with a first connecting hole (122) and a first side hole, the first connecting hole (122) being used for inserting the first connecting post (211), the first side hole being communicated with the first connecting hole (122) and the outer surface of the post (12), the first side hole being connected with the first axial limiting structure (121), the front end of the first axial limiting structure (121) being capable of protruding from the inner surface of the post (12) and being capable of being inserted into the first grooves (212) of the first connecting post (211).

2. The tibial prosthetic intramedullary positioning system according to claim 1, wherein, The first side hole is a first threaded hole, and the first axial limiting structure (121) is a first screw, the first screw being capable of protruding from the inner surface of the post (12) or being capable of being retracted into the first threaded hole by rotating the first screw.

3. The tibial prosthetic intramedullary positioning system according to claim 2, wherein, The main body part (22) is provided with a second connecting hole (222) and a second side hole, the second connecting hole (222) being used for inserting the second connecting post (311), the second side hole being communicated with the second connecting hole (222) and the outer surface of the main body part (22), the second side hole being connected with the second axial limiting structure (221), the front end of the second axial limiting structure (221) being capable of protruding from the inner surface of the main body part (22) and being capable of being inserted into the second grooves (312).

4. The tibial prosthesis intramedullary positioning system of claim 2, wherein, ​ 5. The tibial prosthetic intramedullary positioning system according to claim 4, wherein, ​ 6. The tibial prosthesis intramedullary positioning system of claim 3, wherein, ​ 7. The tibial prosthesis intramedullary positioning system of claim 6, wherein, The second side hole is a second threaded hole, and the second axial limiting structure (221) is a second screw.

8. The tibial prosthesis intramedullary positioning system of claim 1 wherein, The distance between the central axis of the first connecting part (21) and the central axis of the main body part (22) ranges from 0 to 4 mm, and the distance between the central axis of the second connecting part (31) and the central axis of the rod part (32) ranges from 0 to 4 mm.

9. The tibial prosthesis intramedullary positioning system of claim 1 wherein, The rod part (32) comprises a first rod (321) and a second rod (322), the first rod (321) is connected with the second connecting part (31), and the first rod (321) and the second rod (322) are detachably connected.

10. The tibial prosthetic intramedullary positioning system of claim 1, wherein, The stand (12) is internally provided with a first position sensor (123), and the intramedullary rod (3) is provided with a second position sensor (323); the first position sensor (123) and the second position sensor (323) are connected with a controller and a display; the controller is used for calculating the relative position of the first position sensor (123) and the second position sensor (323); and the display is used for displaying the relative position of the first position sensor (123) and the second position sensor (323).

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