CN-122028878-A - Hinge type knee joint prosthesis

CN122028878ACN 122028878 ACN122028878 ACN 122028878ACN-122028878-A

Abstract

The invention relates to a hinged knee prosthesis comprising a femoral component (101) comprising two condyles (101 c and 101 c') and a hinge box (237), a tibial component (108), and a connecting component (150) connected to the tibial component (108) and the femoral component (101). The connecting part (150) comprises a box cover (102) connected with the femur part (101), a t-shaped joint (103) connected with the box cover (102), a pivot pin (104) connected with the t-shaped joint (103) and the box cover (102), an axial bushing (105) connected with the pivot pin (104) and the t-shaped joint (103), and an axial locking screw (106) for fixedly connecting the axial bushing (105), the pivot pin (104) and the t-shaped joint (103) with each other. The lid (102) includes a connector (201). The connection (201) is used to avoid contact between the femoral component (101) and the t-joint (103).

Inventors

Xidante Kansar
Snell Patel
NAMAN SHAH
Pragnesh Patel
Latish KV

Assignees

美利奴医疗保健有限公司

Dates

Publication Date: 20260512
Application Date: 20240905
Priority Date: 20230908

Claims (13)

1. A hinged knee prosthesis (100), comprising: A femoral component (101), the femoral component (101) comprising two condyles (101 c and 101c '), and a hinge box (237) disposed between the two condyles (101 c and 101 c'); Tibia component (108) A connecting component (150), the connecting component (150) operably connected with the tibial component (108) and the femoral component (101), the connecting component (150) comprising: -a cap (102), said cap (102) being operatively connected with said hinge box (237) of said femoral component (101), said cap (102) comprising a connecting piece (201), said connecting piece (201) extending between a sixth face (240) and a seventh face (241) of said cap (102); -a t-joint (103), said t-joint (103) being operatively connected to said lid (102); A pivot pin (104), said pivot pin (104) being operably connected to said t-joint (103) and said lid (102); an axial bushing (105), said axial bushing (105) being operatively connected to said pivot pin (104) and said t-joint (103), and -An axial locking screw (106), the axial locking screw (106) being used for fixedly connecting the axial bushing (105), the pivot pin (104) and the t-joint (103) to each other; wherein the connector (201) is for preventing the femoral component (101) from contacting the t-joint (103).
2. The hinged knee prosthesis (100) of claim 1, wherein the first face (210) of the femoral component (101) mates with the first face (211) of the cap (102), The second face (213) of the femoral component (101) mates with the second face (212) of the connector (201), the third face (239) of the femoral component (101) mates with the third face (238) of the lid (102), and the fourth face (245) of the femoral component (101) mates with the fourth face (244) of the lid (102).
3. The hinged knee prosthesis (100) of claim 1, wherein the hinged knee prosthesis (100) includes a box cap (107), wherein a fifth face (215) of the femoral component (101) mates with a first face (214) of the box cap (107), a lug (217) of the box cap (107) mates with a groove (216) of the femoral component (101), and a second face (234) of the box cap (107) mates with and is concentric with a face (221) of the pivot pin (104).
4. The hinged knee prosthesis (100) of claim 1, wherein, The t-shaped connector (103) is arranged between a sixth surface (240) and a seventh surface (241) of the box cover (102), and the fifth surface (218) of the connecting piece (201) is matched with the first surface (219) of the t-shaped connector (103); The pivot pin (104) passes through the first groove (235) of the box cover (102) and the top groove (220) of the t-shaped joint (103) and is positioned on the blind groove (236) of the box cover (102); The axial bushing (105) passes through the bottom slot (230) of the t-joint (103) and mates with the blind slot (222) of the pivot pin (104), the third face (223) of the axial bushing (105) mates with the blind slot (222) of the pivot pin (104), and the second face (224) on the lug (252) of the axial bushing (105) mates with the second face (253) of the slot on the t-joint (103); The axial locking screw (106) passes through the hole (231) of the axial bushing (105), the hole (232) of the pivot pin (104) and the hole (233) of the t-shaped joint (103), and the external thread on the face (225) of the axial locking screw (106) is interlocked with the internal thread on the hole (233) of the t-shaped joint (103), so that the axial bushing (105), the pivot pin (104) and the t-shaped joint (103) are fixedly connected with each other.
5. The hinged knee prosthesis (100) of claim 1, wherein the hinged knee prosthesis (100) includes a tibial insert (109), the tibial insert (109) disposed on the tibial component (108), the tibial insert (109) including a first face (126) and a second face (128) for mating with a third face (127) and a fourth face (129) of the t-joint (103), respectively, wherein two of the condyles (101 c and 101 c') are supported by the tibial insert (109).
6. The hinged knee prosthesis (100) of claim 5, wherein the hinged knee prosthesis (100) includes a spacer set screw (346), wherein, A bottom surface (350) of the tibial insert (109) mates with a top surface (351) of the tibial component (108); The pad set screw (346) passes through a slot (348) in the tibial pad (109) and a slot (349) in the tibial component (108), and The face (347) of the pad set screw (346) has external threads that interlock with a recess (349) of the tibial component (108) having internal threads for securing the tibial component (108) and the tibial pad (109).
7. The hinged knee prosthesis (100) of claim 1, wherein a post (352) extends perpendicularly from the tibial component (108) assembled with the axial bushing (105).
8. The hinged knee prosthesis (100) of claim 1, wherein the first face (142) of the axial bushing (105) mates with the first face (143) of the tibial component (108) to prevent the t-joint (103) from contacting the tibial component (108).
9. The hinged knee prosthesis (100) of claim 1, wherein the connecting component (150) and the tibial component (108) form a flexion bearing about a first axis, and the connecting component (150) and the femoral component (101) form a rotation bearing about a second axis, the second axis being perpendicular to the first axis.
10. The hinged knee prosthesis (100) of claim 1, wherein the cap (102) with the connector (201) is an integral part.
11. The hinged knee prosthesis (100) of claim 1, wherein the connector (201) is made of a polymeric material.
12. The hinged knee prosthesis (100) of claim 1, wherein the cap (102) is made of a polymeric material.
13. The hinged knee prosthesis (100) of claim 1, wherein the connector (201) is configured to prevent the second face (213) of the femoral component (101) in the hinged knee prosthesis (100) from contacting the first face (219) of the t-joint (103).

Description

Hinge type knee joint prosthesis Technical Field The present invention relates to a knee joint prosthesis. More particularly, the present invention relates to a hinged knee prosthesis and method of assembling the same. Background The knee joint includes a distal femur, a proximal tibia, and a patella. The knee joint is a synovial joint, and has a complex structure, and is connected with the distal femur, the proximal tibia and the patella through two joints, namely a tibiofemoral joint and a patellofemoral joint. The distal femur and proximal tibia constitute a tibiofemoral joint, and the distal femur and patella constitute a patellofemoral joint. In addition, soft tissues such as ligaments and tendons help stabilize the knee during flexion of the joint. However, over time, the knee joint may become worn, damaged, or diseased. For example, osteoarthritis can severely damage articular cartilage within the tibiofemoral and/or patellofemoral joints, resulting in pain from direct bone-to-bone contact and dislocation of the knee joint. This requires surgical intervention, including resecting portions of the distal femur, proximal tibia and patella, and replacing the resected bone with one or more prostheses. The procedure for replacing the patellofemoral and tibial femoral joints is commonly referred to as Total Knee Arthroplasty (TKA) or total knee replacement. For patients with severe defects in stable soft tissue, especially severe slackening or complete resections of the collateral ligaments, a hinged knee prosthesis is required. Conventional hinged knee prostheses provide a1 degree of freedom hinge about which the knee may flex. While they provide the necessary knee stability, normal knee motion is also limited, accompanied by pain, thereby affecting the quality of life of the patient. Accordingly, there is a need to develop hinged knee prostheses that provide additional degrees of freedom to help simulate certain aspects of natural knee motion. Disclosure of Invention The present invention relates to a hinged knee prosthesis. The hinged knee prosthesis includes a femoral component including two condyles and a hinge box disposed between the two condyles, a tibial component, and a connecting component operably connected to the tibial component and the femoral component. The connecting component includes a cap operably coupled with the hinge box of the femoral component. The lid includes a connector extending between a sixth face and a seventh face of the lid. The connecting part further comprises a t-shaped joint, a pivot pin, an axial bushing and an axial locking screw, wherein the t-shaped joint is in operable connection with the box cover, the pivot pin is in operable connection with the t-shaped joint and the box cover, the axial bushing is in operable connection with the pivot pin and the t-shaped joint, and the axial locking screw is used for enabling the axial bushing, the pivot pin and the t-shaped joint to be in fixed connection with each other. The connector is for preventing the femoral component from contacting the t-joint. The above features and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings. Drawings The foregoing summary, as well as the following detailed description of exemplary embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, the drawings show an exemplary structure of the invention. However, the invention is not limited to the specific methods and apparatus disclosed herein. Moreover, it will be appreciated by those skilled in the art that the drawings are not drawn to scale. Fig. 1 is an assembled view of a hinged knee prosthesis 100 in one or more exemplary embodiments of the present invention. Fig. 2A is an exploded view 200a of the components of the hinged knee prosthesis 100 in one or more exemplary embodiments of the present invention. Fig. 2B is an exploded view 200B of the connecting member 150 in a hinged knee prosthesis in one or more exemplary embodiments of the present invention. Fig. 3 is an exploded view 300 of a tibial component of a hinged knee prosthesis, in accordance with one or more exemplary embodiments of the present invention. Fig. 4 is a flow chart illustrating a method 400 for assembling a hinged knee prosthesis in one or more exemplary embodiments of the invention. Detailed Description Before describing the present disclosure in detail, certain words and phrases used in this patent document will be defined, the terms "include" and "comprise" and their derivatives each mean inclusion without limitation thereto, the terms "or" having inclusion, meaning and/or, "connected to" and their derivatives may mean inclusion, inclusion in, interconnection with, inclusion in, connection to, or connection with, connection to, communication with, co-operation with, interleavin