Modularized knee joint filler implantation system with porous structure

Abstract

The invention relates to the field of lower limb joint replacement, and provides a modular knee joint filler implantation system with a porous structure, which comprises a connector, the connector comprises a connecting part and a first Morse taper outer column, the first Morse taper outer column is arranged at one end, close to a joint prosthesis, of the connector, one end of the connecting part is connected with the first Morse taper outer column, and the other end of the connecting part is connected with the second Morse taper outer column; a Morse taper inner hole is formed in the other end of the connecting part, and the first Morse taper outer column is matched with a joint prosthesis; the filler prosthesis is conical, the outer surface of the filler prosthesis is of a porous structure, the inner surface of the filler prosthesis is of a solid structure and is provided with an inner channel, the inner channel is matched with the connector, the extension handle comprises a second Morse taper outer column, an extension matching surface and an extension rod, the second Morse taper outer column is matched with the Morse taper inner hole, and the extension matching surface is circular; a threaded inner hole is formed in the end, close to the joint prosthesis, of the second Morse taper outer column. According to the invention, the condition of secondary bone mass removal caused by the placement of the filler prosthesis is reduced, and the sinking of the bone defect after filling modification is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of lower limb joint replacement, and in particular to a modular knee joint filler implantation system with a porous structure. Background Art

[0002] When the knee joint is damaged and cannot move normally, it is generally necessary to replace the damaged joint with a prosthesis to relieve the patient's pain and restore the normal function of the joint. Generally speaking, the entire knee joint is replaced by a joint replacement prosthesis. The operation involves removing the surface of the corresponding damaged bone and replacing the joint surface with a prosthetic implant. This operation to replace the knee joint with a prosthesis is called a total knee replacement.

[0003] However, primary joint replacements can also fail due to prosthesis wear, aseptic loosening, osteolysis, ligament instability, infection, trauma, etc. When the initial joint replacement surgery fails, a joint revision surgery is generally required, in which the original joint prosthesis is removed and repaired according to the components of the revision joint system. The process of removing the prosthesis will bring out the original bone and form a new bone defect area. Especially for patients with osteolysis, their stem end may have lost most of the bone. The reconstruction of the stem end directly affects the stability of the revision prosthesis after implantation, and becomes the key to the reconstruction of bone defects in revision surgery.

[0004] In recent years, porous filler prostheses have been widely used in bone defect modification surgery at the knee joint. The porous structure of the filler surface facilitates the bone growth and ingrowth of the bone tissue at the interface between the prosthesis and the bone, forming a biological fixation between the filler prosthesis and the human body. When metal fillers are currently used, the filler prosthesis and the joint prosthesis are aligned, but the actual joint bone defect position is not completely aligned with the prosthesis axis. During the operation, more bone needs to be removed or the gap needs to be filled, and the bone needs to be removed again to a certain extent. Filling the bone defect area with bone cement, or filling the position of the bone defect with a smaller pad and then filling it with bone cement, takes a long time and is laborious, and the force transmission is not good, and it is easy to loosen. Filling the defect area with a mixture of screws and bone cement is prone to screw loosening, cement and screw stress fracture, and filling failure. With porous metal fillers, the surface has a porous area that can be biologically fixed, the actual defect position is inconsistent with the filler implantation position, and the filler implantation position cannot be adjusted during the operation, resulting in more bone removal. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a modular knee filler implant system with a porous structure, which enables doctors to choose between several different types of filler prostheses, extension handles, connectors, and joint prostheses. Reduce the secondary bone removal caused by the placement of filler prostheses, and prevent the sinking of bone defects after filling and repair. A 2.5mm eccentric connector is provided, which can place the filler prosthesis more freely. The axial anti-rotation design is limited between each component, and better initial stability can be obtained; the filler prosthesis has a solid structure inside, and a trabecular porous structure is set outside. In this way, the internal structure can achieve the structural strength required for the cone fit, and can also effectively prevent bone cement from penetrating into the trabecular structure and affecting bone ingrowth; the extension handle has an extended mating surface, and screws are used to perform secondary locking fit between the components of the system.

[0006] The present invention provides a modular knee joint filler implant system with a porous structure, comprising: A connector, the connector comprising a connecting portion and a first Morse taper outer column, the first Morse taper outer column being arranged at one end of the connector close to the joint prosthesis, one end of the connecting portion being connected to the first Morse taper outer column, the other end of the connecting portion being provided with a Morse taper inner hole, the first Morse taper outer column being adapted to the joint prosthesis; A filler prosthesis, wherein the filler prosthesis is conical, and the outer surface is a porous structure to achieve initial stability after implantation; the inner surface is a solid structure, and the solid structure is provided with an inner channel, and the inner channel is adapted to the connector; An extension handle comprises a second Morse taper outer column, an extension mating surface and an extension rod, one end of the extension mating surface is connected to the second Morse taper outer column, and the other end is connected to the extension rod, the second Morse taper outer column is adapted to the Morse taper inner hole, the extension mating surface is circular, and the second Morse taper outer column is provided with a threaded inner hole at one end close to the joint prosthesis, a screw is screwed into the threaded inner hole, and the extension mating surface presses the connector and the joint prosthesis tightly.

[0007] A modular knee joint filler implant system with a porous structure provided according to the present invention also includes a first annular groove provided radially along the outer surface of the connecting part, a first locking fitting hole provided on the outer surface of the filler prosthesis, a locking top screw is screwed in through the first locking fitting hole to cooperate with the first annular groove, a second locking fitting hole is provided on the outer surface of the connecting part, and a second annular groove is provided radially at the top end of the second Morse taper outer column, and the locking top screw is screwed in through the second locking fitting hole to cooperate with the second annular groove.

[0008] According to the present invention, a modular knee joint filler implant system with a porous structure is provided, wherein the porous structure is a 3D printed trabecular porous structure, the inner surface is provided with an inner tapered hole, and the inner tapered hole is adapted to the connecting portion.

[0009] According to the present invention, a modular knee joint filler implant system with a porous structure is provided, which also includes that the filler prosthesis is a femoral end filler prosthesis, the cross-section of the femoral end filler prosthesis at one end away from the joint prosthesis is circular, and the cross-section gradually becomes elliptical from far to near, and U-shaped notches are provided on both sides of the end of the femoral end filler prosthesis close to the joint prosthesis, the length of the femoral end filler prosthesis is 40mm~65mm, and the short axis diameter of the cross-section of the femoral end filler prosthesis at one end close to the joint prosthesis is 20mm~26mm, and the long axis diameter is 30mm~45mm.

[0010] According to the present invention, a modular knee joint filler implant system with a porous structure is provided, which also includes that the filler prosthesis is a tibial end filler prosthesis, the cross-section of the tibial end filler prosthesis at the end away from the joint prosthesis is circular, and the cross-section gradually becomes elliptical from far to near, and V-shaped notches are provided on both sides of the end of the tibial end filler prosthesis close to the joint prosthesis. The length of the tibial end filler prosthesis is 40mm~50mm, and the short axis diameter of the cross-section of the tibial end filler prosthesis at the end close to the joint prosthesis is 28mm~35mm, and the long axis diameter is 45mm~58mm.

[0011] According to the present invention, a modular knee joint filler implant system with a porous structure is provided, which also includes that the connector is a 0mm eccentric connector at the femoral end, and the 0mm eccentric connector at the femoral end is a cylinder with a taper. The top of the first Morse taper outer column is provided with a first inner channel, and the first inner channel is provided with a through threaded hole, through which the long femoral locking nail thread locks the connector, the femoral end filler, the extension handle and the joint prosthesis.

[0012] According to the present invention, a modular knee filler implant system with a porous structure is provided, which also includes that the connector is a 2.5mm eccentric connector at the femoral end, and the central axis of the end of the 2.5mm eccentric connector at the femoral end away from the joint prosthesis is offset by 2.5mm from the central axis of the end of the 2.5mm eccentric connector at the femoral end close to the joint prosthesis, and the top of the first Morse taper outer column is provided with a second inner channel, and the second inner channel is provided with a threaded hole, and the connector and the joint prosthesis are threadedly locked by a short femoral locking nail.

[0013] According to the present invention, a modular knee joint filler implant system with a porous structure is provided, which also includes that the connector is a 0mm eccentric connector at the tibial end, the top of the first Morse taper outer column is provided with a third inner channel, and the third inner channel is provided with a through threaded hole, through which the long tibial locking nail thread locks the connector, the tibial end filler, the extension handle and the joint prosthesis.

[0014] A modular knee filler implant system with a porous structure provided by the present invention also includes that the connector is a 2.5mm eccentric connector at the tibial end, the central axis of the end of the 2.5mm eccentric connector at the tibial end away from the joint prosthesis is offset by 2.5mm from the central axis of the end of the 2.5mm eccentric connector at the tibial end close to the joint prosthesis, and the top of the first Morse taper outer column is provided with a fourth inner channel, and the fourth inner channel is provided with a threaded hole, and the connector and the joint prosthesis are threadedly locked by a short tibial locking nail.

[0015] According to the present invention, a modular knee joint filler implant system with a porous structure is provided, and the filler prosthesis is made of titanium alloy.

[0016] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: Doctors can choose between several different types of filler prostheses, extension handles, connectors, and prostheses. Better placement of filler prostheses and reduction of secondary bone removal caused by placement of filler prostheses. The conical anatomical design of the filler prosthesis prevents the bone defect from sinking after the filling modification; a 2.5mm eccentric connector is provided for freer placement of the filler prosthesis. The axial anti-rotation design is limited between each component to obtain better initial stability; the filler prosthesis has a solid structure inside and a trabecular porous structure outside. In this way, the internal structural strength required for the cone fit can be achieved, and bone cement can be effectively prevented from penetrating into the trabecular structure and affecting bone ingrowth; the extension handle has an extended mating surface, and screws are used for secondary locking fit between the components of the system.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1It is a schematic diagram of a 0mm eccentric combination structure at the femoral end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of a femoral end filler prosthesis of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0021] Figure 3 It is a schematic diagram of the structure of a 0mm eccentric connector at the femoral end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0022] Figure 4 It is a schematic diagram of the extended handle structure of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0023] Figure 5 It is a schematic diagram of a 2.5 mm eccentric combination structure at the femoral end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0024] Figure 6 It is a schematic diagram of the structure of a 2.5mm eccentric connector at the femoral end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0025] Figure 7 It is a schematic diagram of a 0mm eccentric combination structure at the tibial end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0026] Figure 8 It is a schematic diagram of the structure of a tibial end filler prosthesis of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0027] Fig. 9 It is a schematic diagram of the structure of a 0mm eccentric connector at the tibial end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0028] Fig.10 It is a schematic diagram of a 2.5 mm eccentric combination structure at the tibial end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0029] Fig.11 It is a schematic diagram of the structure of a 2.5mm eccentric connector at the tibial end of a modular knee joint filler implant system with a porous structure provided by the present invention.

[0030] Reference numerals: 1. Prosthesis outer surface; 2. Prosthesis inner surface; 3. First locking fitting hole; 4. Inner tapered hole; 5. U-shaped notch; 6. First Morse taper outer column; 7. First inner channel; 8. Second inner channel; 9. First annular groove; 10. Third inner channel; 11. Connecting part; 12. Second locking fitting hole; 13. Fourth inner channel; 14. Second Morse taper outer column; 15. Outer fitting surface; 16. Threaded inner hole; 17. Extended handle; 18. Femoral end filling Filler prosthesis; 19, 0mm eccentric connector at the femoral end; 20, long femoral locking nail; 21, joint prosthesis; 22, 2.5mm eccentric connector at the femoral end; 23, short femoral locking nail; 24, 0mm eccentric connector at the tibial end; 25, long tibial locking nail; 26, filler prosthesis at the tibial end; 27, short tibial locking nail; 28, 2.5mm eccentric connector at the tibial end; 29, extension rod; 30, V-shaped notch; 31, second annular groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] Combine the following Figures 1 to 11 A modular knee filler implant system with a porous structure is described in the present invention.

[0036] The connector includes a connecting portion 11 and a first Morse taper outer column 6. The first Morse taper outer column 6 is arranged at one end of the connector close to the joint prosthesis 21. One end of the connecting portion 11 is connected to the first Morse taper outer column 6. The other end of the connecting portion 11 is provided with a Morse taper inner hole. The first Morse taper outer column 6 is adapted to the joint prosthesis 21. The filler prosthesis is conical, and the outer surface is a porous structure to achieve initial stability after implantation; the inner surface is a solid structure, and the solid structure is provided with an inner channel, and the inner channel is adapted to the connector; the inner surface is provided with an inner conical hole 4, and the inner conical hole 4 is adapted to the connecting portion 11; The extension handle 17 includes a second Morse taper outer column 14, an extension mating surface 15 and an extension rod 29. One end of the extension mating surface 15 is connected to the second Morse taper outer column 14, and the other end is connected to the extension rod 29. The second Morse taper outer column 14 is adapted to the Morse taper inner hole. The extension mating surface 15 is circular. A threaded inner hole 16 is provided at one end of the second Morse taper outer column 14 close to the joint prosthesis 21. The screw is screwed into the threaded inner hole 16, and the extension mating surface 15 presses the connector and the joint prosthesis 21.

[0037] A first annular groove 9 is provided on the outer surface of the connecting portion 11 along the radial direction of the connector, and a first locking fitting hole 3 is provided on the outer surface 1 of the filling prosthesis. The locking top screw is screwed into the first locking fitting hole 3 and cooperates with the first annular groove 9 to limit the axial freedom of the filling prosthesis and the connector; a second locking fitting hole 12 is provided on the outer surface of the connector, and a second annular groove 31 is provided on the top end of the second Morse taper outer column 14 along the radial direction. The second locking fitting hole 12 cooperates with the second annular groove 31 to limit the axial freedom of the connector and the extension handle 17.

[0038] In some embodiments of the present invention, the filler prosthesis is designed with a conical anatomical shape to prevent the bone defect from sinking after filling and modification. The filler prosthesis is a solid structure inside and a porous structure of trabeculae outside to achieve a biological fixation effect with the bone surface, with a porosity of 75% to 85%. The internal structure can achieve the structural strength required for the cone fit and can also effectively prevent bone cement from penetrating into the trabecular structure and affecting bone ingrowth.

[0039] According to a modular knee joint filler implant system with a porous structure provided by the present invention, a first annular groove 9 is provided on the outer surface of the connector along the radial direction of the connector, and a locking top screw is screwed into the first locking fitting hole 3 and cooperates with the first annular groove 9 to lock the filler prosthesis and the connector, thereby limiting the axial freedom of the filler prosthesis and the connector.

[0040] According to a modular knee joint filler implant system with a porous structure provided by the present invention, the filler prosthesis includes a femoral end filler prosthesis 18 and a tibial end filler prosthesis 26. The connector includes a femoral end 0mm eccentric connector 19, a femoral end 2.5mm eccentric connector 22, a tibial end 0mm eccentric connector 24 and a tibial end 2.5mm eccentric connector 28.

[0041] Embodiment 1: like Figure 1 As shown, the present invention provides a modular knee joint filler implant system with a porous structure, including a femoral end filler prosthesis 18, a femoral end 0mm eccentric connector 19 and an extension handle 17, which is applied to a femoral end 0mm eccentric combination structure.

[0042] like Figure 2 As shown, the femoral end filler prosthesis 18 is conical, and the outer surface 1 of the filler prosthesis is a porous structure to achieve initial stability after implantation; the inner surface 2 of the filler prosthesis is a solid structure, and the inner surface 2 of the filler prosthesis is provided with an inner tapered hole, which is compatible with the first Morse taper outer column 6; the porous structure is a 3D printed trabecular porous structure, and the solid structure is provided with an inner channel, which is compatible with the connector, and the outer surface 1 of the filler prosthesis is provided with a first locking fitting hole 3, which is used to screw in the locking top screw, and the femoral end filler The cross-section of the end of the prosthesis 18 far from the joint prosthesis 21 is circular, and the cross-section gradually becomes elliptical from far to near. The end of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is provided with a U-shaped notch 5, and the U-shaped notch 5 is used to solve the interference between the femoral end filler prosthesis 18 and the femoral medullary cavity; the length of the femoral end filler prosthesis 18 is 40mm~65mm, and the short axis diameter of the cross-section of the end of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is 20mm~26mm, and the long axis diameter is 30mm~45mm.

[0043] Technicians in this field can choose to set the length of the femoral end filler prosthesis 18 to 40mm, 45mm, 55mm, 65mm, etc. as needed, and the short axis diameter of the cross-section of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is 20mm, 22mm, 24mm, 26mm, etc., and the long axis diameter is 30mm, 35mm, 40mm, 45mm, etc.

[0044] Preferably, the length of the femoral end filler prosthesis 18 is 50 mm, the short axis diameter of the cross section of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is 23 mm, and the long axis diameter is 38 mm.

[0045] like Figure 3 As shown, the femoral end 0mm eccentric connector 19 includes a connecting portion 11 and a first Morse taper outer column 6. The first Morse taper outer column 6 is arranged at one end of the femoral end 0mm eccentric connector 19 close to the joint prosthesis 21. One end of the connecting portion 11 is connected to the first Morse taper outer column 6. The other end of the connecting portion 11 is provided with a Morse taper inner hole. The first Morse taper outer column 6 is adapted to the joint prosthesis 21. A first inner channel 7 is provided at the top end of the first Morse taper outer column 6. The first inner channel 7 is provided with a through threaded hole for screwing in and locking the long femoral locking nail 20. A first annular groove 9 is arranged in the middle of the connecting portion 11 and cooperates with the first locking matching hole 3 to limit the axial freedom of the femoral end filler prosthesis 18 and the femoral end 0mm eccentric connector 19.

[0046] like Figure 4 As shown, the extension handle 17 includes a second Morse taper outer column 14, an extension mating surface 15 and an extension rod 29. One end of the extension mating surface 15 is connected to the second Morse taper outer column 14, and the other end is connected to the extension rod 29. The second Morse taper outer column 14 is adapted to the Morse taper inner hole. The extension mating surface 15 is circular. The second Morse taper outer column 14 is provided with a threaded inner hole at one end close to the joint prosthesis 21. The screw is screwed into the threaded inner hole, and the extension mating surface 15 presses the connector and the joint prosthesis 21, and the connector and the filler prosthesis. The top of the second Morse taper outer column 14 is provided with a second annular groove 31 in the radial direction. The second locking mating hole 12 is matched with the second annular groove 31 to limit the axial freedom of the connector and the extension handle 17.

[0047] The 0mm eccentric connector 19 at the femoral end is matched with the joint prosthesis 21 through the first Morse taper outer column 6, and the extension handle 17 is matched with the Morse taper inner hole through the second Morse taper outer column 14, so that the extension handle 17 is connected to the 0mm eccentric connector 19 at the femoral end, and the femoral end filler prosthesis 18 is connected to the 0mm eccentric connector 19 at the femoral end through the inner tapered hole 4, and the long femoral locking nail 20 is screwed in and locked through the first inner channel 7.

[0048] Embodiment 2: like Figure 5 As shown, the present invention provides a modular knee joint filler implant system with a porous structure, including a femoral end filler prosthesis 18, a femoral end 2.5mm eccentric connector 22 and an extension handle 17, which is applied to a femoral end 2.5mm eccentric combination structure.

[0049] like Figure 2 As shown, the femoral end filler prosthesis 18 is conical, and the outer surface 1 of the filler prosthesis is a porous structure to achieve initial stability after implantation; the inner surface 2 of the filler prosthesis is a solid structure, and the inner surface 2 of the filler prosthesis is provided with an inner tapered hole, which is compatible with the first Morse taper outer column 6; the porous structure is a 3D printed trabecular porous structure, and the solid structure is provided with an inner channel, which is compatible with the connector, and the outer surface 1 of the filler prosthesis is provided with a first locking fitting hole 3, which is used to screw in the locking top screw, and the femoral end filler The cross-section of the end of the prosthesis 18 far from the joint prosthesis 21 is circular, and the cross-section gradually becomes elliptical from far to near. The end of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is provided with a U-shaped notch 5, and the U-shaped notch 5 is used to solve the interference between the femoral end filler prosthesis 18 and the femoral medullary cavity; the length of the femoral end filler prosthesis 18 is 40mm~65mm, and the short axis diameter of the cross-section of the end of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is 20mm~26mm, and the long axis diameter is 30mm~45mm.

[0050] Technicians in this field can choose to set the length of the femoral end filler prosthesis 18 to 40mm, 45mm, 55mm, 65mm, etc. as needed, and the short axis diameter of the cross-section of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is 20mm, 22mm, 24mm, 26mm, etc., and the long axis diameter is 30mm, 35mm, 40mm, 45mm, etc.

[0051] Preferably, the length of the femoral end filler prosthesis 18 is 50 mm, the short axis diameter of the cross section of the femoral end filler prosthesis 18 close to the joint prosthesis 21 is 23 mm, and the long axis diameter is 38 mm.

[0052] like Figure 6 As shown, the femoral end 2.5mm eccentric connector 22 includes a connecting portion 11 and a first Morse taper outer column 6. The first Morse taper outer column 6 is arranged at one end of the femoral end 2.5mm eccentric connector 22 close to the joint prosthesis 21. One end of the connecting portion 11 is connected to the first Morse taper outer column 6. The other end of the connecting portion 11 is provided with a Morse taper inner hole. The first Morse taper outer column 6 is adapted to the joint prosthesis 21. The end of the femoral end 2.5mm eccentric connector 22 away from the joint prosthesis 21 is offset by 2.5mm from the central axis of the end of the femoral end 2.5mm eccentric connector 22 close to the joint prosthesis 21. After the end of the femoral end 2.5mm eccentric connector 22 close to the joint prosthesis 21 is matched with the joint prosthesis 21, the end of the femoral end 2.5mm eccentric connector 22 away from the joint prosthesis 21 and the femoral end filler prosthesis can be matched at any position in the 360° direction at an axial radius of 2.5mm. The first Morse taper outer column 6 is provided with a second inner channel 8, and the second inner channel 8 is provided with a threaded hole for screwing in and locking the short femoral locking nail. When the femoral end 2.5mm eccentric connector 22 is connected, the femoral end filler prosthesis can be placed more freely. The first annular groove 9 is provided at the end of the connecting part 11 away from the joint prosthesis, and cooperates with the first locking matching hole 3 to limit the axial freedom of the femoral end filler prosthesis 18 and the femoral end 2.5mm eccentric connector 22.

[0053] like Figure 4 As shown, the extension handle 17 includes a second Morse taper outer column 14, an extension mating surface 15 and an extension rod 29. One end of the extension mating surface 15 is connected to the second Morse taper outer column 14, and the other end is connected to the extension rod 29. The second Morse taper outer column 14 is adapted to the Morse taper inner hole. The extension mating surface 15 is circular. The second Morse taper outer column 14 is provided with a threaded inner hole at one end close to the joint prosthesis 21. The screw is screwed into the threaded inner hole, and the extension mating surface 15 presses the connector and the joint prosthesis 21, and the connector and the filler prosthesis. The top of the second Morse taper outer column 14 is provided with a second annular groove 31 in the radial direction. The second locking mating hole 12 is matched with the second annular groove 31 to limit the axial freedom of the connector and the extension handle 17.

[0054] The 2.5mm eccentric connector 22 at the femoral end is matched with the joint prosthesis 21 through the first Morse taper outer column 6, and the extended handle 17 is matched with the Morse taper inner hole through the second Morse taper outer column 14, so that the extended handle 17 is connected to the 2.5mm eccentric connector 22 at the femoral end, and the femoral end filler prosthesis 18 is connected to the 2.5mm eccentric connector 22 at the femoral end through the inner tapered hole 4, and the short femoral locking nail 23 is screwed in and locked through the second inner channel 8.

[0055] Embodiment 3: like Figure 7 As shown, the present invention provides a modular knee joint filler implant system with a porous structure, including a tibial end filler prosthesis 26, a tibial end 0mm eccentric connector 24 and an extension handle 17, which is applied to a tibial end 0mm eccentric combination structure.

[0056] like Figure 8As shown, the tibial end filler prosthesis 26 is conical, and the outer surface 1 of the filler prosthesis is a porous structure to achieve initial stability after implantation; the inner surface 2 of the filler prosthesis is a solid structure, and the inner surface 2 of the filler prosthesis is provided with an inner tapered hole, which is compatible with the first Morse taper outer column 6; the porous structure is a 3D printed trabecular porous structure, and the solid structure is provided with an inner channel, which is compatible with the connector, and the outer surface 1 of the filler prosthesis is provided with a first locking fitting hole 3, which is used to screw in the locking top screw, and the tibial end filler prosthesis is provided with a first locking fitting hole 3. The cross-section of the end of 26 away from the joint prosthesis 21 is circular, and the cross-section gradually becomes elliptical from far to near. V-shaped notches 30 are provided on both sides of the end of the tibial end filler prosthesis 26 close to the joint prosthesis 21. The V-shaped notches 30 are used to resolve the interference between the joint prosthesis 21 and the tibial end filler prosthesis 26. The length of the tibial end filler prosthesis 26 is 40mm~50mm, and the short axis diameter of the maximum cross-section of the tibial end filler prosthesis 26 close to the joint prosthesis 21 is 28mm~35mm, and the long axis diameter is 45mm~58mm.

[0057] Technicians in this field can choose to set the length of the tibial end filler prosthesis 26 to 40mm, 42mm, 48mm, 50mm, etc. as needed, and the short axis diameter of the cross-section of the tibial end filler prosthesis 26 close to the joint prosthesis 21 is 28mm, 30mm, 34mm, 35mm, etc., and the long axis diameter is 45mm, 35mm, 40mm, 58mm, etc.

[0058] Preferably, the length of the tibial end filler prosthesis 26 is 45 mm, the maximum cross-sectional minor axis diameter of the end of the tibial end filler prosthesis 26 close to the joint prosthesis 21 is 32 mm, and the major axis diameter is 50 mm.

[0059] like Fig. 9 As shown, the tibial end 0mm eccentric connector 24 includes a connecting portion 11 and a first Morse taper outer column 6. The first Morse taper outer column 6 is arranged at one end of the tibial end 0mm eccentric connector 24 close to the joint prosthesis 21. One end of the connecting portion 11 is connected to the first Morse taper outer column 6. The other end of the connecting portion 11 is provided with a Morse taper inner hole. The first Morse taper outer column 6 is adapted to the joint prosthesis 21; the first Morse taper outer column 6 is provided with a third inner channel 10, and the third inner channel 10 is a threaded through hole, through which the tibial end 0mm eccentric connector 24, the tibial end filler prosthesis 26, the extension handle 17 and the joint prosthesis 21 are threadedly locked by the long tibial locking nail 25, and is used for secondary locking between the tibial end filler prosthesis 26 and the joint prosthesis 21. The first annular groove 9 is arranged in the middle of the connecting portion 11 and cooperates with the first locking fitting hole 3 to limit the axial freedom of the tibial end filler prosthesis 26 and the tibial end 0mm eccentric connector 24.

[0060] like Figure 4As shown, the extension handle 17 includes a second Morse taper outer column 14, an extension mating surface 15 and an extension rod 29. One end of the extension mating surface 15 is connected to the second Morse taper outer column 14, and the other end is connected to the extension rod 29. The second Morse taper outer column 14 is adapted to the Morse taper inner hole. The extension mating surface 15 is circular. The second Morse taper outer column 14 is provided with a threaded inner hole at one end close to the joint prosthesis 21. The screw is screwed into the threaded inner hole, and the extension mating surface 15 presses the connector and the joint prosthesis 21, and the connector and the filler prosthesis. The top of the second Morse taper outer column 14 is provided with a second annular groove 31 in the radial direction. The second locking mating hole 12 is matched with the second annular groove 31 to limit the axial freedom of the connector and the extension handle 17.

[0061] The 0mm eccentric connector 24 at the tibial end is matched with the joint prosthesis 21 through the first Morse taper outer column 6, and the extension handle 17 is matched with the Morse taper inner hole through the second Morse taper outer column 14, so that the extension handle 17 is connected to the 0mm eccentric connector 24 at the tibial end, and the tibial end filler prosthesis 26 is connected to the 0mm eccentric connector 24 at the tibial end through the inner tapered hole 4, and the long tibial locking nail 25 is screwed in and locked through the third inner channel 10.

[0062] Embodiment 4: like Fig.10 As shown, the modular knee joint filler implant system with a porous structure provided by the present invention includes a tibial end filler prosthesis 26, a tibial end 2.5mm eccentric connector 28 and an extension handle 17, which is applied to a tibial end 2.5mm eccentric combined structure.

[0063] like Figure 8 As shown, the tibial end filler prosthesis 26 is conical, and the outer surface 1 of the filler prosthesis is a porous structure to achieve initial stability after implantation; the inner surface 2 of the filler prosthesis is a solid structure, and the inner surface 2 of the filler prosthesis is provided with an inner tapered hole, which is compatible with the first Morse taper outer column 6; the porous structure is a 3D printed trabecular porous structure, and the solid structure is provided with an inner channel, which is compatible with the connector, and the outer surface 1 of the filler prosthesis is provided with a first locking fitting hole 3, which is used to screw in the locking top screw, and the tibial end filler prosthesis is provided with a first locking fitting hole 3. The cross-section of the end of 26 away from the joint prosthesis 21 is circular, and the cross-section gradually becomes elliptical from far to near. V-shaped notches 30 are provided on both sides of the end of the tibial end filler prosthesis 26 close to the joint prosthesis 21. The V-shaped notches 30 are used to resolve the interference between the joint prosthesis 21 and the tibial end filler prosthesis 26. The length of the tibial end filler prosthesis 26 is 40mm~50mm, and the short axis diameter of the maximum cross-section of the tibial end filler prosthesis 26 close to the joint prosthesis 21 is 28mm~35mm, and the long axis diameter is 45mm~58mm.

[0064] Technicians in this field can choose to set the length of the tibial end filler prosthesis 26 to 40mm, 42mm, 48mm, 50mm, etc. as needed, and the short axis diameter of the cross-section of the tibial end filler prosthesis 26 close to the joint prosthesis 21 is 28mm, 30mm, 34mm, 35mm, etc., and the long axis diameter is 45mm, 35mm, 40mm, 58mm, etc.

[0065] Preferably, the length of the tibial end filler prosthesis 26 is 45 mm, the maximum cross-sectional minor axis diameter of the end of the tibial end filler prosthesis 26 close to the joint prosthesis 21 is 32 mm, and the major axis diameter is 50 mm.

[0066] like Fig.11 As shown, the 2.5mm eccentric connector 28 at the tibial end includes a connecting portion 11 and a first Morse taper outer column 6. The first Morse taper outer column 6 is arranged at one end of the 2.5mm eccentric connector 28 at the tibial end close to the joint prosthesis 21. One end of the connecting portion 11 is connected to the first Morse taper outer column 6. The other end of the connecting portion 11 is provided with a Morse taper inner hole. The first Morse taper outer column 6 is adapted to the joint prosthesis 21. A fourth inner channel 13 is provided at the top of the first Morse taper outer column 6. The fourth inner channel is a threaded matching threaded hole. The 2.5mm eccentric connector 28 at the tibial end and the joint prosthesis 21 are threadedly locked by a short tibial locking nail 27, and are used for secondary locking between the tibial end filler prosthesis 26 and the joint prosthesis 21. The first annular groove 9 is arranged at one end of the connecting portion 11 away from the joint prosthesis, and cooperates with the first locking matching hole 3 to limit the axial freedom of the tibial end filler prosthesis 26 and the 2.5mm eccentric connector 28 at the tibial end.

[0067] like Figure 4 As shown, the extension handle 17 includes a second Morse taper outer column 14, an extension mating surface 15 and an extension rod 29. One end of the extension mating surface 15 is connected to the second Morse taper outer column 14, and the other end is connected to the extension rod 29. The second Morse taper outer column 14 is adapted to the Morse taper inner hole. The extension mating surface 15 is circular. The second Morse taper outer column 14 is provided with a threaded inner hole at one end close to the joint prosthesis 21. The screw is screwed into the threaded inner hole, and the extension mating surface 15 presses the connector and the joint prosthesis 21, and the connector and the filler prosthesis. The top of the second Morse taper outer column 14 is provided with a second annular groove 31 in the radial direction. The second locking mating hole 12 is matched with the second annular groove 31 to limit the axial freedom of the connector and the extension handle 17.

[0068] The 2.5mm eccentric connector 28 at the tibial end is matched with the joint prosthesis 21 through the first Morse taper outer column 6, and the extension handle 17 is matched with the Morse taper inner hole through the second Morse taper outer column 14, so that the extension handle 17 is connected to the 2.5mm eccentric connector 28 at the tibial end, and the tibial end filler prosthesis 26 is connected to the 2.5mm eccentric connector 28 at the tibial end through the inner tapered hole 4, and the short tibial locking nail 27 is screwed in and locked through the fourth inner channel 13.

[0069] The beneficial effects of the present invention are: enabling doctors to choose between several different types of filler prostheses, extension handles, connectors, and joint prostheses. Better placement of filler prostheses, reducing secondary bone removal caused by placement of filler prostheses. The conical anatomical design of the filler prosthesis prevents sinking after the bone defect is filled and modified; a 2.5mm eccentric connector is provided to allow for freer placement of the filler prosthesis. The axial anti-rotation design is limited between each component to obtain better initial stability; the filler prosthesis has a solid structure inside and a trabecular porous structure outside. In this way, the structural strength required for the cone fit can be achieved inside, and bone cement can be effectively prevented from penetrating into the trabecular structure and affecting bone ingrowth; the extension handle has an extended mating surface, and screws are used to perform secondary locking fit between the components of the system.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular knee joint filler implant system with a porous structure, characterized in that: include: A connector, the connector comprising a connecting portion and a first Morse taper outer column, the first Morse taper outer column being arranged at one end of the connector close to the joint prosthesis, one end of the connecting portion being connected to the first Morse taper outer column, the other end of the connecting portion being provided with a Morse taper inner hole, the first Morse taper outer column being adapted to the joint prosthesis; A filler prosthesis, wherein the filler prosthesis is conical and has a porous outer surface to achieve initial stability after implantation; The inner surface is a solid structure, the solid structure is provided with an inner channel, and the inner channel is adapted to the connector; An extension handle comprises a second Morse taper outer column, an extension mating surface and an extension rod, one end of the extension mating surface is connected to the second Morse taper outer column, and the other end is connected to the extension rod, the second Morse taper outer column is adapted to the Morse taper inner hole, the extension mating surface is circular, and the second Morse taper outer column is provided with a threaded inner hole at one end close to the joint prosthesis, a screw is screwed into the threaded inner hole, and the extension mating surface presses the connector and the joint prosthesis tightly.

2. A modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The outer surface of the connecting part is provided with a first annular groove along the radial direction of the connecting part, the outer surface of the filling prosthesis is provided with a first locking fitting hole, and a locking top screw is screwed in through the first locking fitting hole to cooperate with the first annular groove. The outer surface of the connecting part is provided with a second locking fitting hole, and the top end of the second Morse taper outer column is provided with a second annular groove along the radial direction, and the locking top screw is screwed in through the second locking fitting hole to cooperate with the second annular groove.

3. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The porous structure is a 3D printed trabecular porous structure, and the inner surface is provided with an inner tapered hole, and the inner tapered hole is adapted to the connecting portion.

4. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The filler prosthesis is a femoral end filler prosthesis, the cross-section of the end of the femoral end filler prosthesis away from the joint prosthesis is circular, and the cross-section gradually becomes elliptical from far to near, and U-shaped notches are provided on both sides of the end of the femoral end filler prosthesis close to the joint prosthesis. The length of the femoral end filler prosthesis is 40mm to 65mm, and the short axis diameter of the cross-section of the end of the femoral end filler prosthesis close to the joint prosthesis is 20mm to 26mm, and the long axis diameter is 30mm to 45mm.

5. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The filler prosthesis is a tibial end filler prosthesis, the cross-section of the end of the tibial end filler prosthesis away from the joint prosthesis is circular, and the cross-section gradually becomes elliptical from far to near, and V-shaped notches are provided on both sides of the end of the tibial end filler prosthesis close to the joint prosthesis. The length of the tibial end filler prosthesis is 40mm~50mm, and the short axis diameter of the cross-section of the end of the tibial end filler prosthesis close to the joint prosthesis is 28mm~35mm, and the long axis diameter is 45mm~58mm.

6. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The connector is a 0mm eccentric connector at the femoral end, which is a cylindrical body with a taper. The top of the first Morse taper outer column is provided with a first inner channel, and the first inner channel is provided with a through threaded hole, through which the long femoral locking nail thread locks the connector, the femoral end filler, the extension handle and the joint prosthesis.

7. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The connector is a 2.5mm eccentric connector at the femoral end, and the central axis of the end of the femoral end 2.5mm eccentric connector away from the joint prosthesis is offset by 2.5mm from the central axis of the end of the femoral end 2.5mm eccentric connector close to the joint prosthesis. The top of the first Morse taper outer column is provided with a second inner channel, and the second inner channel is provided with a threaded hole, and the connector and the joint prosthesis are threadedly locked by a short femoral locking nail.

8. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The connector is a 0mm eccentric connector at the tibial end. The top of the first Morse taper outer column is provided with a third inner channel. The third inner channel is provided with a through threaded hole, through which the long tibial locking nail thread locks the connector, the tibial end filler, the extension handle and the joint prosthesis.

9. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The connector is a 2.5mm eccentric connector at the tibial end, and the central axis of the end of the 2.5mm eccentric connector at the tibial end away from the joint prosthesis is offset by 2.5mm from the central axis of the end of the 2.5mm eccentric connector at the tibial end close to the joint prosthesis. The top of the first Morse taper outer column is provided with a fourth inner channel, and the fourth inner channel is provided with a threaded hole, and the connector and the joint prosthesis are threadedly locked by a short tibial locking nail.

10. The modular knee joint filler implant system with a porous structure according to claim 1, characterized in that: The filler prosthesis is made of titanium alloy.

Images