A mold and manufacturing method for a tibial spacer for the knee joint

Abstract

The application discloses a manufacturing mold and a manufacturing method of a knee joint tibial spacer. The manufacturing mold of the knee joint tibial spacer comprises a supporting seat, a first base, a first cover plate, a second base and a second cover plate. The supporting seat is in a cylindrical structure and is open at both upper and lower ends. The first base and the second base can be respectively detachably arranged in the supporting seat, and the first base and the second base can be respectively adjusted in the installation height in the supporting seat. The first cover plate and the second cover plate can be respectively detachably arranged at the opening of the upper end of the supporting seat. The manufacturing method of the knee joint tibial spacer of the application firstly performs primary injection molding to form a primary injection spacer. If the thickness of the primary injection spacer is not suitable, secondary injection molding is performed to form a secondary injection spacer. Then, the secondary injection spacer is arranged below the primary injection spacer to increase the thickness of the primary injection spacer, so that the best implantation effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of tibial spacer technology for knee joints, and particularly to a mold and manufacturing method for a tibial spacer for knee joints. Background Technology

[0002] To prevent muscle contracture during a second surgery and to increase the concentration of antibiotics within the knee joint cavity, an antibiotic-impregnated cemented tibial spacer is temporarily placed during the first stage of knee revision surgery. Currently, if the thickness of the tibial spacer is found to be insufficient after fabrication, a second adjustment cannot be made, thus affecting the surgical outcome. Summary of the Invention

[0003] The purpose of this application is to provide a mold for manufacturing a tibial spacer for the knee joint, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A mold for manufacturing a tibial spacer for a knee joint includes a support base, a first base, a first cover plate, a second base, and a second cover plate.

[0006] The support base is a cylindrical structure with openings at both the top and bottom. The first base and the second base can be detachably disposed within the support base, and the installation height of the first base and the second base can be adjusted within the support base. The first cover plate and the second cover plate can be detachably disposed at the opening at the top of the support base.

[0007] When the first cover plate is installed at the opening at the upper end of the support base and the first base is installed inside the support base, the first cover plate, the first base and the support base form a primary injection cavity to form a primary injection mold occupier.

[0008] When the second cover plate is installed at the opening at the upper end of the support base and the second base is installed inside the support base, the second cover plate, the second base and the support base form two injection cavities to form a secondary injection mold occupier.

[0009] The secondary injection mold spacer is adapted to be installed below the primary injection mold spacer to increase the thickness of the primary injection mold spacer.

[0010] Furthermore, the side wall of the support base is provided with at least two first locking parts arranged along the axial direction of the support base, and the first locking parts can be locked to the first base or the second base.

[0011] Furthermore, a second locking part is provided around the upper opening of the support base, and the second locking part can be locked and connected with the first cover plate or the second cover plate.

[0012] Furthermore, the first base includes a first base plate and a first connector. The outer contour and dimensions of the first base plate are the same as the shape and dimensions of the inner contour of the cross-section of the support base. The first connector is disposed on the side of the first base plate and is connected to the first locking part of the support base.

[0013] The second base includes a second base plate and a second connecting member. The outer contour and dimensions of the second base plate are the same as the shape and dimensions of the inner contour of the cross-section of the support seat. The second connecting member is disposed on the side of the second base plate and is connected to the first locking part of the support seat.

[0014] Furthermore, the first base plate has a first central hole in the middle, and a first central column is connected to the lower surface of the first base plate. The first central column is hollow inside and communicates with the first central hole, and is used to form the first central column of the initial injection mold placer.

[0015] The second base plate has a second central hole in the middle and a second central column is connected to the lower surface of the second base plate. The second central column is hollow inside and communicates with the second central hole. It is used to form the second central column of the secondary injection mold occupant. The diameter of the second central hole is larger than the diameter of the first central hole, and the internal size of the second central column is larger than the external size of the first central column.

[0016] Furthermore, the lower part of the first central column is provided with a first injection port for injecting bone cement into the cavity, and a first cap is connected to the side of the first injection port, and the first cap is provided with a first vent hole.

[0017] The lower part of the second central column is provided with a second injection port for injecting bone cement into the cavity. A second cap is connected to the side of the second injection port, and a second vent hole is provided on the second cap.

[0018] Furthermore, the upper surface of the first base plate is provided with a placeholder post and a first grid pattern. The first grid pattern includes multiple lines, and all the lines are located in the same plane. The height of the placeholder post is higher than the plane where the first grid pattern is located. The upper surface of the second base plate is provided with a second grid pattern. The second grid pattern includes multiple lines, and all the lines are located in the same plane. No structure higher than the plane where the second grid pattern is located is provided on the second base plate.

[0019] Furthermore, the first cover plate includes a first cover plate body and a first locking member disposed on the side of the first cover plate body. The first locking member can be locked and connected with the second locking part. The lower surface of the first cover plate body is shaped like the tibial articular surface of a knee joint. The second cover plate includes a second cover plate body and a second locking member disposed on the side of the second cover plate body. The second locking member can be locked and connected with the second locking part. The lower surface of the second cover plate body has a planar structure, and the lower surface of the second cover plate body is provided with a locating hole and a protruding column mold. The connecting hole formed by the primary injection molding locator at the location of the locating column and the connecting column formed by the secondary injection molding locator at the location of the locating hole can be inserted into each other. The column mold has the same shape and size as the first central column.

[0020] Furthermore, the first locking member includes a first flange, a first groove is formed between the lower surface of the first flange and the lower surface of the first cover plate body, and a plurality of downwardly extending first buckles are provided on the first flange at intervals. The second locking part includes a second flange provided outside the upper opening of the support base, and a first protrusion is formed between the second flange and the end face of the support base. When the first cover plate covers the upper opening of the support base, the first protrusion is embedded in the first groove, and the first buckles are engaged with the second flange.

[0021] The present invention discloses a method for manufacturing a tibial spacer for a knee joint, which uses the aforementioned mold for manufacturing a tibial spacer for a knee joint. The manufacturing method includes the following steps:

[0022] Fabrication of the initial injection molding spacer: Assemble the first cover plate onto the upper opening of the support base, install the first base in a suitable position inside the support base, and inject bone cement;

[0023] Fabricating the secondary column mold occupier: assemble the second cover plate into the upper opening of the support base, install the second base in a suitable position inside the support base, and inject bone cement;

[0024] The secondary injection molding spacer is assembled below the primary injection molding spacer to form a complete tibial spacer for the knee joint.

[0025] In summary, the technical effects and advantages of this invention are as follows: If the thickness of the tibial spacer is found to be unsuitable after the initial molding, the overall thickness of the tibial spacer can be increased through secondary molding, thereby achieving the best implantation effect. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the initial injection molding placeholder in one embodiment of the present invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the structure of the initial injection molding placeholder in one embodiment of the present invention. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the structure of a secondary injection molding occupant in one embodiment of the present invention. Figure 1 ;

[0030] Figure 4 This is a schematic diagram of the structure of a secondary injection molding occupant in one embodiment of the present invention. Figure 2 ;

[0031] Figure 5 This is an assembly diagram of the primary injection molding spacer and the secondary injection molding spacer in one embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the support base in one embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the first base in one embodiment of the present invention. Figure 1 ;

[0034] Figure 8 This is a schematic diagram of the structure of the first base in one embodiment of the present invention. Figure 2 ;

[0035] Figure 9 This is a schematic diagram of the structure of the first cover plate in one embodiment of the present invention. Figure 1 ;

[0036] Figure 10 This is a schematic diagram of the structure of the first cover plate in one embodiment of the present invention. Figure 2 ;

[0037] Figure 11 This is a top view of the assembly of the support base, the first base, and the first cover plate in one embodiment of the present invention;

[0038] Figure 12 for Figure 11 AA section view;

[0039] Figure 13This is a schematic diagram of the structure of the second base in one embodiment of the present invention. Figure 1 ;

[0040] Figure 14 This is a schematic diagram of the structure of the second base in one embodiment of the present invention. Figure 2 ;

[0041] Figure 15 This is a schematic diagram of the structure of the second cover plate in one embodiment of the present invention. Figure 1 ;

[0042] Figure 16 This is a schematic diagram of the structure of the second cover plate in one embodiment of the present invention. Figure 2 ;

[0043] Figure 17 This is a top view of the assembly of the support base, the second base, and the second cover plate in one embodiment of the present invention;

[0044] Figure 18 for Figure 17 BB cross-sectional view.

[0045] Wherein, 1 is a support base; 11 is a first locking part; 12 is a second locking part; 121 is a second flange; 122 is a first protrusion;

[0046] 2. First base; 21. First base plate; 211. First center hole; 212. First central column; 2121. First injection port; 213. First cap; 214. Placeholder column; 215. First grid pattern; 216. First vent hole; 22. First connector;

[0047] 3. First cover plate; 31. First cover plate body; 32. First locking element; 321. First flange; 322. First groove; 323. First buckle; 324. First extraction slot

[0048] 4. Second base; 41. Second base plate; 411. Second center hole; 412. Second central column; 4121. Second injection port; 413. Second cap; 414. Second grid pattern; 415. Second vent hole; 42. Second connector;

[0049] 5. Second cover plate; 51. Second cover plate body; 511. Occupant hole; 512. Column mold; 52. Second locking component; 521. Third flange; 522. Second groove; 523. Second buckle; 524. Second take-out groove;

[0050] 6. Initial injection of the cavity;

[0051] 7. Two-injection cavity;

[0052] 8. Initial injection mold placeholder; 81. Connecting hole; 82. First center post;

[0053] 9. Secondary injection mold spacer; 91. Connecting pillar; 92. Second center pillar; 93. Assembly hole. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] This embodiment provides a mold for manufacturing a tibial spacer for the knee joint, used to manufacture a primary injection spacer 8 and a secondary injection spacer 9. The secondary injection spacer 9 is suitable for installation below the primary injection spacer 8 to increase the thickness of the primary injection spacer 8, thereby solving the problem that the implantation effect is not ideal due to insufficient thickness of the primary injection spacer 8.

[0059] like Figure 1 and Figure 2As shown, the primary injection molding spacer 8 includes a connecting hole 81 and a first central post 82. The connecting hole 81 serves to cooperate with and fix the secondary injection molding spacer 9 when the thickness of the primary injection molding spacer 8 needs to be increased. The first central post 82 is used for insertion into the medullary cavity, or to cooperate with the secondary injection molding spacer 9 when the thickness of the primary injection molding spacer 8 needs to be increased. The articular surface of the primary injection molding spacer 8 is curved, providing a femoral movement trajectory; the articular ridge provides sufficient constraint for the femoral portion; and the anterior and posterior cruciate ligament notches protect the joint soft tissues. The lower surface of the primary injection molding spacer 8 is a grid-like plane, which increases the contact area and friction, facilitating its combination with the upper surface or bone contact surface of the secondary injection molding spacer 9.

[0060] like Figure 3 and Figure 4 As shown, the secondary injection molding spacer 9 includes a connecting post 91, a second central post 92, and an assembly hole 93. The upper surface of the secondary injection molding spacer 9 is adapted to engage with the lower surface of the primary injection molding spacer 8, wherein the connecting post 91 is adapted to mate with the connecting hole 81 of the primary injection molding spacer 8; the second central post 92 is hollow inside and communicates with the assembly hole 93, and is adapted to mate with the first central post 82 of the primary injection molding spacer 8. The lower surface of the secondary injection molding spacer 9 is a grid-like plane, which can increase the contact area and increase the friction, facilitating engagement with the bone contact surface.

[0061] like Figure 5 As shown, the secondary injection mold spacer 9 is installed below the primary injection mold spacer 8. The connecting post 91 of the secondary injection mold spacer 9 is inserted into the connecting hole 81 of the primary injection mold spacer 8, and the first central post 82 of the primary injection mold spacer 8 is inserted into the second central post 92 and the assembly hole 93 of the secondary injection mold spacer 9, forming a whole.

[0062] like Figures 6-18 As shown, the mold for manufacturing the tibial spacer of the knee joint includes a support base 1, a first base 2, a first cover plate 3, a second base 4, and a second cover plate 5. Specifically, the support base 1 is a cylindrical structure with openings at both the top and bottom. The first base 2 and the second base 4 can be detachably disposed within the support base 1, and their installation heights within the support base 1 can be adjusted. The installation heights of the first base 2 and the second base 4 within the support base 1 determine the thicknesses of the primary injection spacer 8 and the secondary injection spacer 9, respectively. The first cover plate 3 and the second cover plate 5 can be detachably disposed at the openings at the upper ends of the support base 1.

[0063] When the first cover plate 3 is installed at the opening at the upper end of the support base 1, and the first base 2 is installed inside the support base 1, the first cover plate 3, the first base 2, and the support base 1 form the initial injection cavity 6 to form the initial injection mold spacer 8. When the second cover plate 5 is installed at the opening at the upper end of the support base 1, and the second base 4 is installed inside the support base 1, the second cover plate 5, the second base 4, and the support base 1 form the second injection cavity 7 to form the secondary injection mold spacer 9. The secondary injection mold spacer 9 is suitable for installation below the initial injection mold spacer 8 to increase the thickness of the initial injection mold spacer 8.

[0064] In this embodiment, the first cover plate 3, the first base 2, and the support 1 are used for the initial injection molding. If it is found that the thickness of the formed initial injection mold spacer 8 is insufficient, the second cover plate 5, the second base 4, and the support 1 can be used for the secondary injection molding. The resulting secondary injection mold spacer 9 is installed below the initial injection mold spacer 8 to increase the thickness of the initial injection mold spacer 8, thereby achieving the best implantation effect.

[0065] In the mold for manufacturing the tibial spacer for the knee joint, the support base 1 can be assembled with the first cover plate 3 and the first base 2 for initial injection molding, or it can be assembled with the second cover plate 5 and the second base 4 for secondary injection molding. The structure of the support base 1 is as follows: Figure 6 As shown. The side wall of the support base 1 is provided with at least two first locking parts 11 arranged along the axial direction of the support base 1. The first locking parts 11 can be locked to the first base 2 or the second base 4. The outer periphery of the upper opening of the support base 1 is provided with a second locking part 12, which can be locked to the first cover plate 3 or the second cover plate 5.

[0066] In this embodiment, the first locking part 11 consists of multiple slots of different heights, with numbers marked on the sides of each slot. When the first base 2 is pushed into a slot on the side wall of the support base 1, the number on the side of that slot indicates the thickness of the spacer to be formed. The second locking part 12 includes a second flange 121 disposed outside the upper opening of the support base 1, with a first protrusion 122 formed between the second flange 121 and the end face of the support base 1. In other embodiments, the structures of the first locking part 11 and the second locking part 12 can be other forms.

[0067] like Figure 7 and Figure 8 As shown, the first base 2 includes a first base plate 21 and a first connecting member 22. The outer contour and dimensions of the first base plate 21 are the same as the shape and dimensions of the inner contour of the cross-section of the support base 1. The first connecting member 22 is disposed on the side of the first base plate 21 and is connected to the first locking part 11. In this embodiment, the first connecting member 22 is a plurality of buckles that engage with the slot structure of the side wall of the support base 1. In other embodiments, the first connecting member 22 can be configured as a slot and the first locking part 11 can be configured as a buckle.

[0068] Specifically, the upper surface of the first base plate 21 is provided with a placeholder post 214 and a first grid pattern 215. The first grid pattern 215 includes multiple raised lines, all of which are located in the same plane. The height of the placeholder post 214 is higher than the plane in which the first grid pattern 215 is located. A first central hole 211 is provided in the middle of the first base plate 21. A first central post 212 is connected to the lower surface of the first base plate 21. The first central post 212 is hollow inside and communicates with the first central hole 211. A first injection port 2121 for injecting bone cement is provided at the lower part of the first central post 212. A first cap 213 is connected to the side of the first injection port 2121. After the bone cement fills the cavity, the port is sealed and formed. A first vent hole 216 is provided on the first base plate 21 and the first cap 213. The first vent hole 216 can discharge the gas in the cavity, which can achieve better filling of the internal cavity by the bone cement.

[0069] like Figure 9 and Figure 10 As shown, the first cover plate 3 includes a first cover plate body 31 and a first locking member 32 disposed on the side of the first cover plate body 31. The first locking member 32 can be locked and connected with the second locking part 12. The lower surface of the first cover plate body 31 is shaped like the tibial articular surface of the knee joint.

[0070] Specifically, the first locking member 32 includes a first flange 321, and a first groove 322 is formed between the lower surface of the first flange 321 and the lower surface of the first cover plate body 31. Multiple downwardly extending first latches 323 are spaced apart on the first flange 321. When the first cover plate 3 covers the opening at the upper end of the support base 1, the first protrusion 122 is embedded in the first groove 322, and the first latches 323 are engaged on the second flange 121. A first removal groove 324 is provided around the first latches 323 to facilitate the insertion of surgical tools and removal of the first cover plate 3 after the initial injection molding of the placeholder 8.

[0071] In addition, in this embodiment, the detachable connection between the first cover plate 3, the first base 2 and the support 1 can also be achieved through other means such as locking screws or pin connections.

[0072] like Figure 11 and Figure 12 As shown, the first cover plate 3, the first base 2, and the support seat 1 form the initial injection cavity 6 to produce the initial injection mold spacer 8. The spacer post 214 is used to form the connecting hole 81 of the initial injection mold spacer 8; the first central post 212 communicates with the first central hole 211 to form the first central post 82 of the initial injection mold spacer 8; the lower surface of the first cover plate body 31, which is shaped like the tibial articular surface of a knee joint, is used to form the tibial articular surface-shaped upper surface of the initial injection mold spacer 8; and the first mesh pattern 215 is used to form the mesh-shaped lower surface of the initial injection mold spacer 8.

[0073] like Figure 13 and Figure 14 As shown, the second base 4 includes a second base plate 41 and a second connecting member 42. The second base 4 is adapted to be installed inside the support base 1. Therefore, the outer contour and dimensions of the second base plate 41 are the same as the shape and dimensions of the inner contour of the cross-section of the support base 1. The second connecting member 42 is disposed on the side of the second base plate 41 and is connected to the first locking part 11. In this embodiment, the second connecting member 42 is a plurality of buckles that engage with the slot structure of the side wall of the support base 1. In other embodiments, the second connecting member 42 can be configured as a slot and the first locking part 11 can be configured as a buckle.

[0074] Specifically, a second central hole 411 is provided in the middle of the second base plate 41, and a second central column 412 is connected to the lower surface of the second base plate 41. The second central column 412 is hollow inside and communicates with the second central hole 411. The diameter of the second central hole 411 is larger than the diameter of the first central hole 211, and the internal dimensions of the second central column 412 are larger than the external dimensions of the first central column 212. A second injection port 4121 for injecting bone cement into the cavity is provided below the second central column 412. A second cap 413 is connected to the side of the second injection port 4121. After the bone cement fills the cavity, it is sealed and molded. A second vent hole 415 is provided on the second base plate 41 and the second cap 413. The second vent hole 415 can discharge the gas in the cavity, which can achieve better filling of the internal cavity by the bone cement. The upper surface of the second base plate 41 is provided with a second grid pattern 414, which includes multiple raised lines. All the raised lines are located in the same plane. The second base plate 41 does not have any structure higher than the plane where the second grid pattern 414 is located.

[0075] like Figure 15 and Figure 16 As shown, the second cover plate 5 includes a second cover plate body 51 and a second locking member 52 disposed on the side of the second cover plate body 51. The second locking member 52 can be locked and connected with the second locking part 12. The lower surface of the second cover plate body 51 has a planar structure, and the lower surface of the second cover plate body 51 is provided with a locating hole 511 and a protruding column mold 512. The column mold 512 has the same shape and size as the first central column 82.

[0076] Specifically, the second locking member 52 includes a third flange 521, and a second groove 522 is formed between the lower surface of the third flange 521 and the lower surface of the second cover plate body 51. Multiple downwardly extending second latches 523 are spaced apart on the third flange 521. The second locking part 12 includes a second flange 121 located outside the upper opening of the support base 1. A first protrusion 122 is formed between the second flange 121 and the end face of the support base 1. When the second cover plate 5 covers the upper opening of the support base 1, the first protrusion 122 is embedded in the second groove 522, and the second latches 323 are engaged with the second flange 121. A second removal groove 524 is provided around the second latches 523 to facilitate the insertion of surgical tools and removal of the second cover plate 5 after the secondary injection molding spacer 9 has been formed.

[0077] In addition, in this embodiment, the detachable connection between the second cover plate 5, the second base 4 and the support 1 can also be achieved through other means such as locking screws or pin connections.

[0078] like Figure 17 and Figure 18 As shown, the second cover plate 5, the second base 4, and the support 1 form two injection cavities 7 to produce the secondary injection mold spacer 9. The second central column 412 communicates with the second central hole 411 and mates with the protruding column mold 512 on the second cover plate body 51. It is used to form the second central column 92 and the assembly hole 93 of the secondary injection mold spacer 9. The second central column 92 is hollow and communicates with the assembly hole 93, suitable for mates with the first central column 82 of the primary injection mold spacer 8. The spacer hole 511 is used to form the connecting column 91 of the secondary injection mold spacer 9. The connecting hole 81 formed in the primary injection mold spacer 8 at the location of the spacer column 214 and the connecting column 91 formed in the secondary injection mold spacer 9 at the location of the spacer hole 511 can be interlocked. The second grid pattern 414 is used to form the grid-like lower surface of the primary injection mold spacer 9.

[0079] This embodiment also provides a method for manufacturing a tibial spacer for the knee joint. The tibial spacer for the knee joint is manufactured using the mold for manufacturing a tibial spacer for the knee joint as described above. The manufacturing method includes the following steps:

[0080] Making the initial injection mold spacer 8: Push the first base 2 into the support base 1 from the lower end and lock it into the appropriate slot. Cover the upper opening of the support base 1 with the first cover plate 3 and lock it in place to form a closed initial injection cavity 6. Inject bone cement into the initial injection cavity 6 through the bone cement injection hole 2121 of the first base 2. Cover it with the first sealing cap 213 to seal it. After molding is completed, remove the first cover plate 3 and the first base 2 and demold the initial injection mold spacer 8 to obtain the initial injection mold spacer 8 product.

[0081] Fabrication of the secondary injection molding spacer 9: If the thickness of the initial injection molding spacer 8 is found to be too small during implantation, a secondary injection molding process is required to fabricate the secondary injection molding spacer 9 to meet surgical requirements. The second base 4 is pushed into the support base 1 from its lower end and locked in place. The second cover plate 5 is placed over the upper opening of the support base 1 and locked in place, forming a secondary injection cavity 7. Bone cement is injected into the secondary injection cavity 7 through the bone cement injection hole 4121 of the second base 4. The second sealing cap 413 is then placed on top to seal the cavity. After molding is complete, the second cover plate 5 and the second base 4 are removed, and the secondary injection molding spacer 9 is demolded to obtain the secondary injection molding spacer 9 product.

[0082] Assemble the secondary injection mold spacer 9 and the primary injection mold spacer 8: Assemble the secondary injection mold spacer 9 below the primary injection mold spacer 8. At this time, the connecting post 91 of the secondary injection mold spacer 9 is inserted into the connecting hole 81 of the primary injection mold spacer 8, and the first central post 82 of the primary injection mold spacer 8 is inserted into the second central post 92 through the assembly hole 93 of the secondary injection mold spacer 9, forming a complete tibial spacer for the knee joint.

[0083] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold for manufacturing a tibial spacer for a knee joint, characterized by, The utility model relates to a kind of injection mold, including support seat (1), first base (2), first cover plate (3), second base (4) and second cover plate (5); The support seat (1) is cylindrical structure, both ends are open, the first base (2) and the second base (4) can be respectively detachably arranged in the support seat (1), and the first base (2) and the second base (4) can be respectively adjusted in the installation height in the support seat (1), the first cover plate (3) and the second cover plate (5) can be respectively detachably arranged in the opening of the upper end of the support seat (1); When the first cover plate (3) is installed in the opening of the upper end of the support seat (1), the first base (2) is installed into the support seat (1), the first cover plate (3), the first base (2) and the support seat (1) form a first injection cavity (6) to form a first injection positioner (8); When the second cover plate (5) is installed in the opening of the upper end of the support seat (1), the second base (4) is installed into the support seat (1), the second cover plate (5), the second base (4) and the support seat (1) form a second injection cavity (7) to form a second injection positioner (9); The second injection positioner (9) is suitable for being installed below the first injection positioner (8) to increase the thickness of the first injection positioner (8); The first base (2) includes a first bottom plate (21), the upper surface of the first bottom plate (21) is provided with a position column (214), the middle part of the first bottom plate (21) is provided with a first center hole (211), the lower surface of the first bottom plate (21) is connected with a first middle column (212), the first middle column (212) is hollow inside and communicates with the first center hole (211); the position column (214) is used for forming a connecting hole (81) of the first injection positioner (8); the first middle column (212) communicates with the first center hole (211) and is used for forming a first center column (82) of the first injection positioner (8); The second base (4) includes a second bottom plate (41), the middle part of the second bottom plate (41) is provided with a second center hole (411), the lower surface of the second bottom plate (41) is connected with a second middle column (412), the second middle column (412) is hollow inside and communicates with the second center hole (411), the second cover plate (5) includes a second cover plate body (51), the lower surface of the second cover plate body (51) is a plane structure, and the lower surface of the second cover plate body (51) is provided with a position hole (511) and a protruding column die (512); The second center column (412) cooperates with the second center hole (411) and the column die (512) to form the second center column (92) and the assembly hole (93) of the secondary injection-molded spacer (9), the second center column (92) is hollow inside and communicates with the assembly hole (93), and is suitable for cooperating with the first center column (82) of the primary injection-molded spacer (8); the spacer hole (511) is used for forming the connecting column (91) of the secondary injection-molded spacer (9), and the connecting hole (81) formed by the primary injection-molded spacer (8) at the position of the spacer column (214) and the connecting column (91) formed by the secondary injection-molded spacer (9) at the position of the spacer hole (511) can be inserted into each other.

2. The fabrication mold for a knee tibial spacer according to claim 1, wherein, The side wall of the support seat (1) is provided with at least two first locking parts (11) arranged in the axial direction of the support seat (1), and the first locking parts (11) can be locked and connected with the first base (2) or the second base (4).

3. The fabrication mold for a knee tibial spacer according to claim 2, wherein, The outer periphery of the upper end opening of the support seat (1) is provided with a second locking part (12), and the second locking part (12) can be locked and connected with the first cover plate (3) or the second cover plate (5).

4. The fabrication mold for a knee tibial spacer according to claim 3, wherein The first base (2) comprises a first connecting piece (22), the outer contour and size of the first bottom plate (21) are the same as the shape and size of the cross-sectional inner contour of the support seat (1), the first connecting piece (22) is arranged on the side surface of the first bottom plate (21), and the first connecting piece (22) is connected with the first locking part (11). The second base (4) comprises a second connecting piece (42), the outer contour and size of the second bottom plate (41) are the same as the shape and size of the cross-sectional inner contour of the support seat (1), the second connecting piece (42) is arranged on the side surface of the second bottom plate (41), and the second connecting piece (42) is connected with the first locking part (11).

5. The manufacturing mold of the knee tibial spacer according to claim 4, wherein The aperture of the second center hole (411) is larger than the aperture of the first center hole (211), and the inner dimension of the second center column (412) is larger than the outer dimension of the first center column (212).

6. The fabrication mold for a knee tibial spacer according to claim 5, wherein, The lower part of the first center column (212) is provided with a first injection port (2121) for injecting bone cement into a cavity, and a first cover (213) is connected to the side of the first injection port (2121), and the first cover (213) is provided with a first air hole (216). The lower part of the second center column (412) is provided with a second injection port (4121) for injecting bone cement into a cavity, and a second cover (413) is connected to the side of the second injection port (4121), and the second cover (413) is provided with a second air hole (415).

7. The fabrication mold for a knee tibial spacer according to claim 5, wherein, The upper surface of the first bottom plate (21) is provided with a first grid pattern (215) comprising a plurality of lines, and the plurality of lines are located in the same plane, the height of the occupying column (214) is higher than the plane where the first grid pattern (215) is located, the upper surface of the second bottom plate (41) is provided with a second grid pattern (414), the second grid pattern (414) comprises a plurality of lines, and the plurality of lines are located in the same plane, and the second bottom plate (41) is not provided with a structure higher than the plane where the second grid pattern (414) is located.

8. The fabrication mold for a knee tibial spacer according to claim 7, wherein, The first cover plate (3) comprises a first cover plate body (31) and a first locking piece (32) arranged on the side of the first cover plate body (31), the first locking piece (32) can be locked and connected with the second locking part (12), and the lower surface of the first cover plate body (31) is in the shape of a knee tibial articular surface; the second cover plate (5) comprises a second locking piece (52) arranged on the side of the second cover plate body (51), the second locking piece (52) can be locked and connected with the second locking part (12), and the column mode (512) has the same shape and size as the first center column (82).

9. The fabrication mold for a knee tibial spacer according to claim 8, wherein, The first locking piece (32) comprises a first flange (321), a first recess (322) is formed between the lower surface of the first flange (321) and the lower surface of the first cover plate body (31), a plurality of downward extending first buckles (323) are arranged on the first flange (321) at intervals, the second locking part (12) comprises a second flange (121) arranged outside the upper end opening of the support seat (1), a first protrusion (122) is formed between the second flange (121) and the end surface of the support seat (1), when the first cover plate (3) covers the opening at the upper end of the support seat (1), the first protrusion (122) is embedded in the first recess (322), and the first buckle (323) is clamped on the second flange (121).

10. A method for manufacturing a tibial spacer for a knee joint, characterized in that, The mold for manufacturing the knee tibial occupying device of any one of claims 1-9 is manufactured, comprising the following steps: Manufacturing the primary injection molding occupying device (8): assembling the first cover plate (3) to the upper end opening of the support seat (1), installing the first base (2) at a suitable position inside the support seat (1), and injecting bone cement; Manufacturing the secondary injection molding occupying device (9): assembling the second cover plate (5) to the upper end opening of the support seat, installing the second base (4) at a suitable position inside the support seat (1), and injecting bone cement; Assembling the secondary injection molding occupying device (9) below the primary injection molding occupying device (8) to form a complete knee tibial occupying device.

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