CN201168074Y

CN201168074Y - Customized artificial semi-knee joint

Info

Publication number: CN201168074Y
Application number: CN 200820028600
Authority: CN
Inventors: 王臻; 刘鹏; 李涤尘; 郭征; 李靖; 栗向东; 连芩
Original assignee: Fourth Military Medical University FMMU
Current assignee: Fourth Military Medical University FMMU
Priority date: 2008-03-18
Filing date: 2008-03-18
Publication date: 2008-12-24
Anticipated expiration: 2018-03-18

Abstract

A customized semi-knee joint prosthesis comprises a metal femoral condyle joint which is matched with the size and the shape of a tibial plateau, a rolling pillar which is connected with the metal femoral condyle joint to a whole is arranged in the metal femoral condyle joint, cylindrical grooves which are concentric with the rolling pillar are respectively arranged at the both sides of the rolling pillar, a rolling combination table which is provided with an intramedullary nail and matched with the rolling pillar is sheathed on the rolling pillar, side pressure boards with bosses are respectively arranged at the both sides of the rolling combination table, and the bosses of the side pressure boards are inserted in the grooves of the rolling pillar. The rolling pillar is arranged in the articular surface of the metal femoral condyle joint of the semi-knee joint prosthesis, thereby allowing the upper part of the prosthesis which is the rolling combination table and arranged on a femoral shaft and the lower part which is the articular surface of the metal femoral condyle joint to have the relative motion in a certain angle, and the lower part is relatively still to the tibial plateau within the period. Therefore, the customized semi-knee joint prosthesis can achieve the purposes of completing the whole process of knee joint flexion and reducing the wear of the prosthesis on the articular cartilage surface.

Description

A kind of customized artificial semi-knee-joint

Technical field

This utility model relates to a kind of metal prostheses that solves two leg length discrepancys, behind the damaged Reconstruction of particularly a kind of knee joint malignant bone tumor osteoarthrosis, and the metathetical customized artificial semi-knee-joint of condyle of femur lower end malignant bone tumor artificial semi-knee-joint.

Technical background

Knee joint be keep stand, bear a heavy burden, the vitals of human body essential requirements of living such as walking, also be the position that malignant bone tumor is preferably sent out.Protect the carrying out property leg length discrepancy that the limb postoperative occurs for solving, but the most frequently used in the present method for reconstructing is to use the prolonged type prosthese to rebuild. bone is damaged, but exist to need repeatedly operation, the suffered wound of patient big (but tradition prolonged type prosthese), perhaps economic cost higher, prolong shortcomings (but new type auto prolonged type prosthese) such as distance is limited, late result is imprecise.Especially under the existing medical system of China, most of patients is difficult to bear the prosthetic replacement of tens thousand of even hundreds of thousands, the expense of operation repeatedly, and is higher for the effect expectation of protecting the limb treatment simultaneously.Therefore, seek a kind of cheaply durable, painful little artificial prosthesis Therapeutic Method of wound, be of great practical significance at the treatment of knee joint malignant bone tumor.

Be positioned at the malignant bone tumor of metaphysis and epiphysis end, because articular cartilage is the barrier of tumor by local invasion and attack, therefore under the situation of having got rid of the intraarticular tumor contamination, can keep articular cartilage face corresponding with it, take the semiarthrosis displacement, thereby preserve the energy for growth of offside epiphysis.Yet the displacement short-term of simple femoral condyle prosthesis surface or simple tibial plateau prosthesis causes wearing and tearing to offside host joint end cartilage, causes bone pain for a long time, is the bottleneck of artificial semi-knee-joint research.Studies show that at the prosthetic replacement postoperative, choosing of the geometry of prosthese and material is the two big factors of influence to the lateral cartilages degree of wear, and the former is even more important.

Summary of the invention

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, a kind of patient at the distal part of femur bone tumor is provided, only replace kneed condyle of femur part during reconstruction, thereby can preserve the energy for growth of tibia epiphysis, the not isometric problem of the two lower limb of solution knee joint malignant bone tumor postoperative is to a certain degree only carried out metathetical customized artificial semi-knee-joint to a side in joint.

For achieving the above object, the technical solution adopted in the utility model is: comprise a metal condyle of femur joint that is complementary with tibial plateau size, form, a rolling pillar that is connected as a single entity with metal condyle of femur joint is set in the inside in metal condyle of femur joint, rolling pillar both sides offer one and the concentric cylindrical grooves of rolling pillar respectively, also are provided with the fixedly bridging board of artificial ligament on the rolling pillar; The rolling that has intramedullary needle that matches with the rolling pillar is sleeved on the rolling pillar in conjunction with platform, and is respectively arranged with the side guide that has boss in this rolling in conjunction with the both sides of platform, and the boss of side guide inserts in the groove of rolling pillar.

The inside of rolling pillar of the present utility model offers the posterior cruciate ligament femur condyle passage of half circular trace, the rear that is positioned at the rolling pillar of this passage, and bridging board is press-fit in posterior cruciate ligament in the passage; The upper end of rolling pillar is half-cylindrical, and rolling in conjunction with the platform inner surface is a semicolumn concave surface that matches with rolling pillar upper end half round post, and it is identical with the radius of rolling pillar upper end semicolumn in conjunction with the radius of platform to roll; Angle between rolling pillar and the metal condyle of femur joint inside panel is 85 °; Intramedullary needle is 9 ° with the angle that rolling combines the vertical of platform.

Because this utility model is provided with a rolling pillar in artificial semi-knee-joint metal condyle of femur articular surface inside, making the prosthese upper-part that is fixed on femoral shaft promptly roll in conjunction with platform and lower member is the relative motion in certain angle of metal condyle of femur articular surface, and lower member is interior during this period static with respect to tibial plateau.When knee joint was in little flexing, the curvature movement of whole prosthese was born with the relative rolling movement of lower member inside by upper-part; And when the dark flexing of knee joint, upper-part drives lower member and continues sliding motion, thereby reaches the whole process of finishing knee sprung and reduce the purpose of prosthese to the articular cartilage surface wear.

Description of drawings

Fig. 1 is an overall structure sketch map of the present utility model;

Fig. 2 is the structural representation in this utility model condyle of femur joint 1;

Fig. 3 is the structural representation of this utility model rolling pillar 2;

Fig. 4 is the structural representation of this utility model bridging board;

Fig. 5 is that this utility model rolls in conjunction with the structural representation of platform;

Fig. 6 is that the rolling of this utility model band intramedullary pin is in conjunction with the platform structural representation.

The specific embodiment

Below in conjunction with accompanying drawing this utility model is further described.

Referring to Fig. 1,2,2,4,5,6, this utility model comprise one with the tibial plateau size, the metal condyle of femur joint 1 that form is complementary, in the inside in metal condyle of femur joint 1 upper end that is connected as a single entity with metal condyle of femur joint 1 being set is half-cylindrical rolling pillar 2, rolling pillar both sides offer one and rolling pillar 2 concentric cylindrical grooves 3 respectively, the inside of rolling pillar 2 also offers the posterior cruciate ligament femur condyle passage 9 of half circular trace, the symmetric rear that is distributed in rolling pillar 2, the gateway of this passage 9, fixedly the bridging board 8 of artificial ligament press fit over outside the posterior cruciate ligament femur condyle passage 9, thereby firm fixedly ligamentaum cruciatum is guaranteed the stability of prosthetic replacement patella.Rolling is a semicolumn concave surface that matches with rolling pillar upper end half round post in conjunction with platform 5 inner surfacies, and the radius of cam 5 is identical with the radius of rolling pillar 2 upper end semicolumns, the rolling that has intramedullary needle 4 that matches with rolling pillar 2 is sleeved on the rolling pillar 2 in conjunction with platform 5, and be respectively arranged with the side guide 7 that has boss 6 in conjunction with the both sides of platform 5 in this rolling, the boss 6 of side guide 7 inserts in the groove 3 of rolling pillars 2, thereby both can prevent that the dislocation of parts can also drive lower member when the dark flexing of knee joint up and down slides on tibial plateau.Angle between rolling pillar 2 and metal condyle of femur joint 1 inside panel is 85 °; Intramedullary needle 4 is 9 ° with the angle that rolling combines the vertical of platform 5.

Prosthese indoor design of the present utility model is a kind of be rolling friction pair promptly by intermediary rolling pillar 2, the device of the motion formed in conjunction with platform 5 of rolling.This device guarantees that knee joint is within the angle of frequent flexing, motion is born by the intravital tourelle of vacation, friction between prosthese and the tibial plateau is converted into the up and down rolling friction between the parts, and when knee joint more during the flexing of the degree of depth, upper-part drives lower member and slides on tibial plateau jointly.This device can farthest reduce the wearing and tearing of prosthese for the offside articular cartilage under the prerequisite of abarticular function.

This utility model has farthest reduced the wearing and tearing of metal prostheses to the offside articular cartilage face when solving the two leg length discrepancys in the damaged reconstruction of malignant bone tumor postoperative B﹠J back; The artificial ligament fixture is set, the stability behind the increase prosthetic replacement on prosthese; And the articular surface of prosthese lower member partly adopts the rapid shaping technique manufacturing, and is adaptive good with the offside articular surface, accomplishes the different kneed individuation demands of different patients.

Claims

1, a kind of customized artificial semi-knee-joint, it is characterized in that: comprise a metal condyle of femur joint (1) that is complementary with tibial plateau size, form, a rolling pillar (2) that is connected as a single entity with metal condyle of femur joint (1) is set in the inside in metal condyle of femur joint (1), rolling pillar both sides offer one and the concentric cylindrical grooves of rolling pillar (2) (3) respectively, also are provided with the fixedly bridging board of artificial ligament (8) on the rolling pillar (2); The rolling that has intramedullary needle (4) that matches with rolling pillar (2) is sleeved on the rolling pillar (2) in conjunction with platform (5), and be respectively arranged with the side guide (7) that has boss (6) in this rolling in conjunction with the both sides of platform (5), the boss (6) of side guide (7) inserts in the groove (3) of rolling pillar (2).

2, customized artificial semi-knee-joint according to claim 1, it is characterized in that: the inside of said rolling pillar (2) offers the posterior cruciate ligament femur condyle passage (9) of half circular trace, the rear that is positioned at rolling pillar (2) of this passage (9), bridging board (8) is press-fit in posterior cruciate ligament in the passage (9).

3, customized artificial semi-knee-joint according to claim 1, it is characterized in that: the upper end of said rolling pillar (2) is for half-cylindrical, rolling is a semicolumn concave surface that matches with rolling pillar upper end half round post in conjunction with platform (5) inner surface, and it is identical with the radius of rolling pillar (2) upper end semicolumn in conjunction with the radius of platform (5) to roll.

4, customized artificial semi-knee-joint according to claim 1 is characterized in that: the angle between said rolling pillar (2) and metal condyle of femur joint (1) inside panel is 85 °.

5, customized artificial semi-knee-joint according to claim 1 is characterized in that: said intramedullary needle (4) is 9 ° with the angle that rolling combines the vertical of platform (5).