CN201668541U

CN201668541U - Knee joint rotating platform prosthesis

Info

Publication number: CN201668541U
Application number: CN 201020167888
Authority: CN
Inventors: 程鸿远; 谢峰
Original assignee: Trauson Medical Instrument China Co Ltd
Current assignee: Trauson Medical Instrument China Co Ltd
Priority date: 2010-04-23
Filing date: 2010-04-23
Publication date: 2010-12-15
Anticipated expiration: 2020-04-23

Abstract

The utility model relates to a knee joint rotating platform prosthesis, which is provided with a tibia support and a tibia mat, wherein the upper end face of the tibia support and the lower end face of the tibia mat are planes; the upper end face of the tibia support is provided with two to three limit posts, wherein one limit post is a main limit post; the edge of the lower end face of the tibia mat is provided with corresponding open limit grooves, wherein one limit groove is a main limit groove; and the limit posts are arranged in the corresponding limit grooves respectively, the main limit post and the corresponding main limit groove move in the front and rear directions and are limited connection in the upper and lower directions, the other limit posts can move in the corresponding limit grooves, and the distance between the opening of the main limit groove and the inner ends of the other limit grooves is smaller than the distance between the main limit post and the other limit posts. The tibia mat can move front and back and properly rotate in a certain area, accords with the normal natural knee joint motion process of a human body, and does not cause the phenomena of over rotation, separation and the like. The knee joint rotating platform prosthesis has skilful and reasonable design and high practical value.

Description

A kind of knee joint rotation platform prosthese

Technical field

This utility model relates to a kind of medical artificial joint prosthesis, particularly a kind of knee joint rotation platform prosthese.

Background technology

Knee joint is one of the most complicated joint of human body maximum, structure, is topmost joint in the human motion process.The development of knee joint prosthesis system is apart from the history of existing decades of the present, when human body natural's knee joint causes part or all of afunction owing to reasons such as pathological changes or damages, just need to adopt knee joint prosthesis system to be replaced, to rebuild the knee joint normal function, reduce the ailing and inconvenient of patient, implement the knee joint prosthesis system replacement and can reach best therapeutic effect, can recover patient's ability to act to greatest extent.

Knee-joint prosthesis is divided into fixed platform type knee-joint prosthesis and rotation platform type knee-joint prosthesis, and fixed platform type knee-joint prosthesis adopts butterfly or circular and plane contact mode, and the joint contact face is less, and the goodness of fit is lower; And rotation platform type knee-joint prosthesis has been simulated the normal knee joint structure of human body, in articulatio femorotibialis, implant similar meniscal liner, articulatio femorotibialis adopts the disc contact, the goodness of fit is higher, reduced the contact stress of prosthese, and liner can move at intraarticular, mobility, function of joint are better, the prosthese wearing and tearing are low, meet the biomechanics characteristic of human body knee joint compound movement.

Common described rotation platform type knee-joint prosthesis comprises femoral prosthesis and rotation platform prosthese (being also referred to as the tibial plateau prosthese), femoral prosthesis is connected with distal femur by stem or screw or bonding way are installed, the rotation platform prosthese comprises tibia holder and tibia pad, the tibia holder is installed in proximal tibia, the tibia pad then is arranged between femoral prosthesis and the tibia holder, can translation or rotation in the tibia holder, tibia pad upper end matches with the articular surface of femoral prosthesis lower end, is used for simulating normal human body natural's motion of knee joint process.

The rotation platform prosthese that uses generally is divided into two kinds at present, a kind of is to be representative with the MBK of ZIMMER (Jie Mai) company rotation knee joint, the tibia pad of this rotation knee joint rotation platform prosthese is rotationally connected by the installation stem and is connected in the tibia holder, though can rotate, but can only be to be the fixedly rotation in axle center so that stem to be installed, do not meet the requirement of the interior outside asymmetric rotational of human body knee joint, do not limit for rotation simultaneously, because of excessive rotation human body is damaged easily; Another kind is with JOHNSON﹠amp; The LCS rotation knee joint of JOHNSON (Johnson ﹠ Johnson) company is representative, the tibia holder top of this rotation knee joint rotation platform prosthese is a spacing platform, the tibia pad just contacts with the tibia holder and does not have concrete fixedly connected, its motion mode meets the requirement of the interior outside asymmetric rotational of human body knee joint, but the tibia pad breaks away from the tibia holder easily, this patient after to full knee replacement can produce many risks, and may cause knuckle failure.

The utility model content

The purpose of this utility model is to provide a kind of above-mentioned shortcoming that overcomes, and simulates the knee joint rotation platform prosthese of normal human body natural's motion of knee joint process.

The technical scheme that realizes this utility model purpose is: a kind of knee joint rotation platform prosthese has tibia holder and tibia pad; The lower surface of the upper surface of described tibia holder and tibia pad is the plane, and tibia holder upper surface is provided with two to three limited posts, and one of them limited post is main limited post; The edge, lower surface of tibia pad is provided with corresponding opening stopper slot, and one of them stopper slot is main stopper slot; Each limited post is separately positioned in the corresponding stopper slot, main limited post moves with corresponding main stopper slot fore-and-aft direction, the spacing connection of above-below direction, other limited posts can move in corresponding stopper slot, and the inner distance of main stopper slot opening part and other stopper slots is less than the distance between main limited post and other limited posts.

The tibia holder upper surface of above-mentioned a kind of knee joint rotation platform prosthese is provided with three limited posts, is respectively main limited post, left limit post and right limit post, and three limited posts are isosceles triangle to be arranged, and main limited post cross sectional shape is "T"-shaped; The edge, lower surface of tibia pad is provided with three stopper slots, be respectively main stopper slot, left limit groove and right limit groove, each stopper slot is all at the lower surface of tibia pad edge opening, main stopper slot is the Long Circle open slot, left limit groove and right limit groove are " V " shape open slot, main stopper slot cross sectional shape is "T"-shaped, main limited post is arranged in the main stopper slot, the left limit post is arranged in the left limit groove, the right limit groove is arranged in the right limit groove, the inner distance of main stopper slot opening part and left limit groove is less than the distance between main limited post and the left limit post, and the inner distance of main stopper slot opening part and right limit groove is less than the distance between main limited post and the right limit post.

The main limited post of above-mentioned a kind of knee joint rotation platform prosthese is that cross sectional shape is "T"-shaped cylinder.

The fore-and-aft direction maximum displacement distance of the tibia pad of above-mentioned a kind of knee joint rotation platform prosthese in the tibia holder is 4～6 millimeters, and the tibia pad is that the maximum rotation angle in the center of circle is 14～16 degree with main limited post in the tibia holder.

The fore-and-aft direction maximum displacement distance of the tibia pad of above-mentioned a kind of knee joint rotation platform prosthese in the tibia holder is 5 millimeters, the tibia pad is that maximum angle that the center of circle laterally rotates is 12 degree with main limited post in the tibia holder, and the maximum angle that laterally rotates is 3 degree.

The utlity model has following characteristics: (1) tibia holder of the present utility model and tibia pad employing post cooperate with groove, the displacement of restriction tibia pad above-below direction, distance design between distance between the limited post and the stopper slot simultaneously, can be convenient for assembly, can prevent that again the tibia pad breaks away from the phenomenon generation of tibia holder, limited the transition of tibia pad simultaneously and rotated, it is ingenious reasonable to design; (2) to adopt cross sectional shape be "T"-shaped cylinder to this utility model master limited post, easily manufactured, spacing accurately, rotate flexibly, wearing and tearing are low; (3) maximum displacement of this utility model fore-and-aft direction is 5 millimeters, and the rotational angle outside is 12 degree, and the inboard is 3 degree, can rationally use according to human body left and right sides knee joint, meets normal human body natural's motion of knee joint process, has higher utility.

Description of drawings

For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, this utility model is described in further detail, wherein

Fig. 1 is the three-dimensional exploded perspective view of this utility model tibia pad and muscles and bones holder;

Fig. 2 is this utility model tibia pad schematic perspective view;

Fig. 3 is this utility model tibia pad front view;

Fig. 4 is the sketch map of this utility model tibia pad extreme position 1;

Fig. 5 is the sketch map of this utility model tibia pad extreme position 2;

Fig. 6 is the sketch map of this utility model tibia pad extreme position 3;

Fig. 7 is the sketch map of this utility model tibia pad extreme position 4;

The specific embodiment

(embodiment 1)

See Fig. 1 to Fig. 7, the utlity model has tibia holder 1 and tibia pad 2; The lower surface of the upper surface of tibia holder 1 and tibia pad 2 is the plane, tibia holder 1 upper surface is provided with three limited posts 3, be respectively main limited post 31, left limit post 32 and 33, three limited posts 3 of right limit post and be the isosceles triangle arrangement, main limited post 31 is "T"-shaped cylinder for cross sectional shape; The edge, lower surface of tibia pad 2 is provided with three stopper slots 4, be respectively main stopper slot 41, left limit groove 42 and right limit groove 43, each stopper slot 4 is all at the lower surface of tibia pad 2 edge opening, main stopper slot 41 is the Long Circle open slot, left limit groove 42 and right limit groove 43 are " V " shape open slot, main stopper slot 41 cross sectional shapes are "T"-shaped, main limited post 31 is arranged in the main stopper slot 41, main limited post 31 moves with corresponding main stopper slot 41 fore-and-aft directions, the spacing connection of above-below direction, left limit post 32 is arranged in the left limit groove 42 and can moves in groove, right limit groove 43 is arranged in the right limit groove 43 and can moves in groove, the fore-and-aft direction maximum displacement distance of tibia pad 2 in tibia holder 1 is 5 millimeters, tibia pad 2 is 12 degree with main limited post 31 maximum angle that to be the center of circle rotate to a side in tibia holder 1, the maximum angle that rotates to opposite side is 3 degree, main stopper slot 41 opening parts and left limit groove 42 inner distances are less than the distance between main limited post 31 and the left limit post 32, and main stopper slot 41 opening parts and right limit groove 43 inner distances are less than the distance between main limited post 31 and the right limit post 33.

Because present tibia pad 2 mostly is an elastomeric material, in when assembling as long as tibia pad 2 is placed on relevant position in the tibia holder 1, knock installation then, tibia pad 2 takes place to be connected in the tibia holder 1 after the slight elasticity distortion, in normal moving process the limited post of tibia pad can be subjected to muscles and bones holder stopper slot restriction and and main stopper slot, " T " of post connects restriction and can't break away from, but can in certain zone, move forward and backward and suitable rotation, when meeting normal human body natural's motion of knee joint process and transition can not take place rotate, phenomenons such as disengaging.

Claims

1. a knee joint rotation platform prosthese has tibia holder (1) and tibia pad (2); It is characterized in that: the lower surface of the upper surface of described tibia holder (1) and tibia pad (2) is the plane, and tibia holder (1) upper surface is provided with two to three limited posts (3), and one of them limited post (3) is main limited post (31); The edge, lower surface of tibia pad (2) is provided with corresponding opening stopper slot (4), and one of them stopper slot (4) is main stopper slot (41); Each limited post (3) is separately positioned in the corresponding stopper slot (4), main limited post (31) moves with corresponding main stopper slot (41) fore-and-aft direction, the spacing connection of above-below direction, other limited posts (3) can move in corresponding stopper slot (4), and the inner distance of main stopper slot (41) opening part and other stopper slots (4) is less than the distance between main limited post (31) and other limited posts (3).

2. a kind of knee joint rotation platform prosthese according to claim 1, it is characterized in that: described tibia holder (1) upper surface is provided with three limited posts (3), be respectively main limited post (31), left limit post (32) and right limit post (33), three limited posts (3) are isosceles triangle to be arranged, and main limited post (31) cross sectional shape is "T"-shaped; The edge, lower surface of tibia pad (2) is provided with three stopper slots (4), be respectively main stopper slot (41), left limit groove (42) and right limit groove (43), each stopper slot (4) is all at the lower surface edge opening of tibia pad (2), main stopper slot (41) is the Long Circle open slot, left limit groove (42) and right limit groove (43) are " V " shape open slot, main stopper slot (41) cross sectional shape is "T"-shaped, main limited post (31) is arranged in the main stopper slot (41), left limit post (32) is arranged in the left limit groove (42), right limit groove (43) is arranged in the right limit groove (43), the inner distance of main stopper slot (41) opening part and left limit groove (42) is less than the distance between main limited post (31) and the left limit post (32), and the inner distance of main stopper slot (41) opening part and right limit groove (43) is less than the distance between main limited post (31) and the right limit post (33).

3. a kind of knee joint rotation platform prosthese according to claim 1 and 2 is characterized in that: described main limited post (31) is "T"-shaped cylinder for cross sectional shape.

4. a kind of knee joint rotation platform prosthese according to claim 3, it is characterized in that: the fore-and-aft direction maximum displacement distance of described tibia pad (2) in tibia holder (1) is 4～6 millimeters, and it be that the maximum rotation angle in the center of circle is 14～16 to spend that tibia pad (2) is gone up with main limited post (31) in tibia holder (1).

5. a kind of knee joint rotation platform prosthese according to claim 4, it is characterized in that: the fore-and-aft direction maximum displacement distance of described tibia pad (2) in tibia holder (1) is 5 millimeters, it is that the maximum angle that rotate to a side in the center of circle is 12 degree that tibia pad (2) is gone up with main limited post (31) in tibia holder (1), and the maximum angle that rotates to opposite side is 3 degree.