CN112168434A

CN112168434A - Tibial prosthesis component and pressing device

Info

Publication number: CN112168434A
Application number: CN202011222839.1A
Authority: CN
Inventors: 李维健; 蒋鹏
Original assignee: Beijing Zhong An Tai Hua Science & Technology Co ltd
Current assignee: Beijing Zhong An Tai Hua Science & Technology Co ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-01-05

Abstract

The application relates to a tibial prosthesis component and a pressing-in device, and relates to the technical field of medical instruments, the tibial prosthesis component comprises a tibial tray and a tibial pad, a concave part of the tibial tray is clamped and in clearance fit with the concave part of the tibial pad, a slot is arranged on the back side surface of the tibial pad, and a hook-shaped slot communicated with the slot is arranged on the back side surface of the concave part; the press-in device comprises a main body and a movable handle, the main body comprises an installation part and a handle part connected to the rear end of the installation part, an installation cavity is formed in the installation part, a push rod moving back and forth is arranged in the installation cavity, the movable handle is hinged to the main body, one end of the movable handle stretches into the installation cavity and is movably connected with the rear end of the push rod, the movable handle can push the push rod to move forwards to stretch out the installation cavity, one end of the installation part, far away from the handle part, is provided with a slot capable of stretching into the tibial prosthesis assembly and a positioning hook. This application can reduce the not hard up risk in shin bone support later stage.

Description

Tibial prosthesis component and pressing device

Technical Field

The application relates to the field of medical equipment, in particular to a tibial prosthesis component and a pressing device.

Background

Degenerative knee joint disease, also known as knee osteoarthritis, is the most common disease of the elderly with high disability rate, and the incidence rate of the degenerative knee joint disease is obviously increased with the age of patients. In recent years, with the continuous improvement of joint implant design and the continuous improvement of surgical techniques, the clinical effect of knee joint prosthesis replacement for treating knee osteoarthritis is better and better. The tibia part of the knee joint prosthesis consists of a tibia support and a tibia pad, the tibia support and the tibia pad are usually designed by a clamping groove, the tibia support is firstly arranged in the knee joint replacement operation, and then the tibia pad is driven into the tibia support by knocking tools such as a tibia pad driver and a bone hammer.

Because the tibia support is already installed, the tibia pad is knocked and installed by adopting a knocking method, so that the tibia support is easy to shake and loosen, the possibility of later loosening of the prosthesis is caused, the revision rate of the prosthesis is improved, and great economic loss and body pain are brought to a patient.

Disclosure of Invention

To reduce the risk of loosening of the tibial tray, the present application provides tibial prosthetic components and compression devices.

In a first aspect, the present application provides a tibial prosthetic component, which employs the following technical solutions:

a tibial prosthesis component comprises a tibial tray and a tibial pad, wherein a concave part is arranged on the tibial tray, a convex part which is clamped with the concave part and is in clearance fit with the concave part is arranged on the tibial pad, a front clamping groove is arranged on the front side surface of the concave part, a rear clamping groove is arranged on the rear side surface of the concave part, a front flange which is in fit clamping fit with the front clamping groove is arranged on the front side surface of the convex part, and a rear flange which is in fit clamping fit with the rear clamping groove is arranged on the rear side surface of the convex part; the back side of the tibia pad is provided with a slot communicated with the depressed part, the back side of the depressed part is provided with a hook-shaped slot communicated with the slot, the back side of the tibia pad is provided with two grooves, and the two grooves are located on the left side and the right side of the slot.

Through adopting above-mentioned technical scheme, the bellying clearance fit of the depressed part of shin bone support and shin bone pad for can realize the assembly between preceding draw-in groove and the preceding flange, between back draw-in groove and the back flange, the slot of bellying and the hook-shaped groove of depressed part are used for cooperating the location hook of push in device, and the recess of shin bone pad is used for cooperating the pressure head of push in device.

Optionally, preceding draw-in groove with between the preceding flange and back draw-in groove with be the inclined plane cooperation between the back flange, and constitute the forked tail structure, the angle of the contained angle that preceding draw-in groove formed is greater than the angle of the contained angle that preceding flange formed, and the angle of the contained angle that back draw-in groove formed is the same with the contained angle that back flange formed, and is greater than the angle of the contained angle that preceding draw-in groove formed.

Through adopting above-mentioned technical scheme, the forked tail structural connection is firm, and the angle of the contained angle that preceding draw-in groove formed is less than the angle that back draw-in groove formed, the angle of the contained angle that preceding flange formed is the same with the angle of the contained angle that the back flange formed, can make things convenient for in the assembly.

Optionally, the tibial tray has a greater height in an anterior portion of the recess than in a posterior portion of the recess; the left end and the right end of the front side of the concave part are provided with splayed flaring openings, and the left end and the right end of the front side of the convex part are also provided with corresponding splayed flaring openings; the bottom surface of the concave part can be subjected to high polishing treatment; the bottom surface of the tibia support is provided with a medullary cavity rod, the medullary cavity rod is inserted into the medullary cavity of the tibia during installation, and the bottom end of the medullary cavity rod can be arranged to be of an arc structure; a pulp cavity wing fixedly connected with the bottom surface of the tibia support is fixed on the side surface of the pulp cavity rod, and the pulp cavity wing gradually narrows from top to bottom; the bottom end of the tibial tray is provided with a plurality of lugs with the same height.

Through adopting above-mentioned technical scheme, can make things convenient for in the assembly of tibial tray and tibial pad, and can strengthen the installation intensity of tibial tray and shin bone pulp chamber, prevent that the tibial tray from becoming flexible.

In a second aspect, the present application provides a press-in device, which adopts the following technical solutions:

the utility model provides an impressing device, includes main part and movable handle, the main part includes the installation department and connects the handle portion at the installation department rear end, the installation cavity has in the installation department, be provided with the push rod of back-and-forth movement in the installation cavity, movable handle is articulated with the main part through fixing the first articulated shaft in the main part, movable handle's one end stretches into the installation cavity, and with the rear end swing joint of push rod winds first articulated shaft rotates movable handle is close to handle portion, movable handle promotes movable handle stretches out the installation cavity to the forward movement of push rod, the handle portion one end of keeping away from of installation department is provided with the location hook towards the front side, the location hook can stretch into the slot of tibial prosthesis subassembly and with hook-shaped groove cooperation joint.

Through adopting above-mentioned technical scheme, when using the push in device assembly shin bone false body subassembly, earlier with the cooperation of the preceding draw-in groove of shin bone support and the preceding protruding edge of shin bone pad, then stretch into the slot of shin bone pad and with hook slot cooperation joint with push in device's location hook, it is close to handle portion to rotate movable handle again, make movable handle promote the push rod and move to the front side, to shin bone pad application of force, in the depressed part of shin bone support is impressed with the bellying of shin bone pad, can avoid the shin bone support vibrations not hard up through the mounting means installation of impressing, thereby it leads to the fact the not hard up possibility in shin bone support later stage to reduce, the repair rate of reduction false body, reduce patient.

Optionally, the activity handle stretch into installation cavity one end and seted up along its length direction and connect the slot hole, wear to be equipped with the second articulated shaft in the connection slot hole, the push rod rear end pass through the second articulated shaft with the activity handle is articulated and slides along connecting the slot hole direction.

Through adopting above-mentioned technical scheme, realize relative movement through connecting the slot hole connection between activity handle and the push rod, make the push rod can realize the linear motion of fore-and-aft direction.

Optionally, an inclined guide member is fixedly connected in the installation cavity, the guide member is inclined towards the direction close to the positioning hook, and a guide long hole in sliding fit with the guide member is formed in the push rod.

Through adopting above-mentioned technical scheme, guide and direction slot hole sliding fit can restrict the moving direction of push rod, exert the power that is close to the shin bone and hold in the palm the direction to the shin bone pad, make the bellying of shin bone pad imbed in the depressed part that the shin bone held in the palm more easily.

Optionally, the guide member includes two guide pins arranged at intervals, and a connecting line between the two guide pins is inclined toward the direction close to the positioning hook.

Through adopting above-mentioned technical scheme, two uide pins are less to the frictional resistance of direction slot hole inner wall, make the push rod remove easily.

Optionally, the front end of the push rod is provided with a pressure head with a U-shaped structure, and two ends of the pressure head are arranged forwards and are respectively matched and spliced with the two grooves of the tibia pad.

Through adopting above-mentioned technical scheme, the both ends of pressure head are to the recess application of force that is located the slot both sides, can make the shin bone pad atress more balanced.

Optionally, a third hinge shaft which is vertically arranged is arranged at the front end of the push rod, and the third hinge shaft is hinged to the middle of the pressure head.

Through adopting above-mentioned technical scheme, the pressure head can rotate around third articulated axle to guarantee that the both ends of pressure head can butt shin bone and application of force simultaneously.

Optionally, an elastic member is disposed between the movable handle and the handle portion of the cylinder.

Through adopting above-mentioned technical scheme, the elastic component can promote the automatic resilience of activity handle, and is convenient and use.

Optionally, the elastic element includes two elastic pieces that are included angle settings, two one end of elastic piece respectively with activity handle and handle portion fixed connection, two the other end of elastic piece is pegged graft the cooperation each other.

By adopting the technical scheme, when the two elastic sheets are bent under the pressure of the movable handle and the handle part, the generated bending stress is small, and the service life is long.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the tibial prosthesis component is assembled by using the pressing-in device, the positioning hook of the pressing-in device is matched and clamped with the tibial prosthesis component, then the movable handle is rotated, the push rod is enabled to press the convex part of the tibial pad into the concave part of the tibial tray, and the pressing-in installation mode can avoid the tibial tray from vibrating and loosening, so that the possibility of later loosening of the prosthesis is reduced, the repair rate of the prosthesis is reduced, and the economic loss and body pain of a patient are reduced;

2. the guide piece is matched with the guide long hole, so that the moving direction of the push rod can be limited, and the force close to the tibial tray is applied to the tibial pad, so that the convex part of the tibial pad is more easily embedded into the concave part of the tibial tray;

3. the both ends of pressure head are to the recess application of force that is located the slot both sides, can improve the equilibrium and the stability of shin bone pad atress.

Drawings

FIG. 1 is a schematic view of the overall construction of a tibial prosthetic component when separated;

FIG. 2 is a cross-sectional view of the tibial prosthetic component as assembled;

FIG. 3 is a schematic view of the assembly face of the tibial prosthetic component;

fig. 4 is a schematic view of the overall structure of the tibial tray;

FIG. 5 is a schematic view of the tibial prosthetic component assembled using the compression device;

FIG. 6 is a schematic view of the structure inside the mounting portion of the press-in device;

fig. 7 is an exploded view of the ram portion of the press-in device.

Description of reference numerals: 1. a tibial tray; 11. a recessed portion; 111. a front card slot; 112. a rear clamping groove; 113. a hook-shaped groove; 12. a medullary cavity rod; 13. a bump; 14. a pulp cavity wing; 2. a tibial pad; 21. a boss portion; 211. a front flange; 212. a rear flange; 213. a slot; 22. a groove; 31. a main body; 311. an installation part; 3111. a mounting cavity; 3112. a yielding groove; 312. a handle portion; 313. a positioning hook; 32. a movable handle; 321. connecting the long holes; 33. a push rod; 331. an extension portion; 332. a limiting part; 3321. a front limiting cambered surface; 333. a mounting gap; 334. a third hinge shaft; 335. a guide long hole; 34. a first hinge shaft; 35. a second hinge shaft; 36. a pressure head; 361. an intermediate portion; 362. a force application end; 363. a limiting groove; 3631. a rear limiting cambered surface; 37. a guide pin; 38. an elastic sheet.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a tibial prosthetic component. Referring to fig. 1 and 2, the tibial prosthesis component comprises a tibial tray 1 and a tibial pad 2, wherein a concave part 11 is arranged on the top surface of the tibial tray 1, a convex part 21 is arranged at the bottom of the tibial pad 2, and the concave part 11 is clamped with the convex part 21 and is in clearance fit with the convex part 21. For clarity and simplicity of expression language of the embodiments, the side of the tibial tray 1 facing the popliteal fossa is defined as the anterior side.

Referring to fig. 1 and 2, the front side of the recessed portion 11 is curved, the front side of the recessed portion is provided with a front locking groove 111, the rear side of the recessed portion is provided with a rear locking groove 112, the front side of the protruding portion 21 is provided with a front flange 211 engaged with the front locking groove 111, and the rear side of the protruding portion is provided with a rear flange 212 engaged with the rear locking groove 112. The front clamping groove 111 is matched with the front flange 211 through an inclined plane, and the rear clamping groove 112 is matched with the rear flange 212 through an inclined plane, so that a dovetail structure is formed.

During installation, the anterior flange 211 is snapped into the anterior slot 111 and then a force is applied to the posterior side of the tibial pad 2 in an anterior direction to snap the posterior flange 212 into the posterior slot 112 with clearance between the recess 11 and the projection 21.

Referring to fig. 1 and 2, a slot 213 is formed in the middle of the rear side of the tibial pad 2, and the slot 213 communicates with the recess 11 of the tibial tray 1. The rear side of the recess 11 is formed with a hook groove 113, and the hook groove 113 is communicated with the insertion groove 213. Two grooves 22 are further formed in the rear side of the tibia pad 2, the two grooves 22 are arc-shaped grooves 22, and the two grooves 22 are symmetrically arranged on the left side and the right side of the slot 213.

Referring to fig. 2 and 3, to facilitate the installation of the convex portion 21 of the tibial pad 2 into the concave portion 11 of the tibial tray 1, the following arrangement may be made for the tibial prosthetic component: the angle of the included angle formed by the front clamping groove 111 is 1-2 degrees larger than that formed by the front flange 211, the angle of the included angle formed by the rear clamping groove 112 is the same as that formed by the rear flange 212, and is larger than that formed by the front clamping groove 111, for example, the angle of the included angle formed by the front clamping groove 111 is set to be 30 degrees, the angle of the included angle formed by the front flange 211 is 28 degrees, and the angle of the included angle formed by the front flange 211 and that formed by the rear flange 212 are both set to be 80 degrees; the tibial tray 1 has a greater height in the anterior portion of the recess 11 than in the posterior portion of the recess 11; the left end and the right end of the front side surface of the concave part 11 are provided with splayed flaring openings, and the left end and the right end of the front side surface of the convex part 21 are also provided with corresponding splayed flaring openings; the bottom surface of the recessed portion 11 may also be highly polished, which facilitates assembly and reduces wear in the later period.

Referring to fig. 4, the bottom surface (i.e., the side facing away from the tibial pad 2) of the tibial tray 1 is provided with a medullary cavity rod 12, the medullary cavity rod 12 is inserted into the medullary cavity of the tibia during installation, and the bottom end of the medullary cavity rod 12 can be arranged in an arc structure to avoid stress concentration on the inner wall of the medullary cavity during installation. The side surface of the marrow cavity rod 12 is fixed with a marrow cavity wing 14, the marrow cavity wing 14 is fixedly connected with the bottom surface of the tibia support 1, the marrow cavity wing 14 is gradually narrowed from top to bottom, so that the tibia support 1 is convenient to be in taper press fit with the marrow cavity bone surface after being arranged in the marrow cavity. The bottom end of the tibial tray 1 is also provided with a plurality of convex blocks 13, and the heights of the convex blocks 13 are the same, so that the thickness of the bone cement smeared between the bottom surface and the bone surface of the tibial tray 1 is uniform and consistent.

The embodiment of the application also discloses a press-in device. Referring to fig. 5 and 6, the press-in device includes a main body 31 and a movable handle 32. The main body 31 includes a mounting portion 311 and a handle portion 312, two ends of the mounting portion 311 face in the front-rear direction, a rear end of the mounting portion 311 is connected with one end of the handle portion 312, the mounting portion and the handle portion can be integrally formed, and an acute included angle is formed between the movable handle 32 and the handle portion 312. The front end of the mounting part 311 is fixedly connected with a positioning hook 313, the positioning hook 313 is arranged forwards, can extend into the slot 213 of the tibial pad 2 of the tibial prosthesis component, and is matched and clamped with the hook-shaped slot 113 of the tibial tray 1. The inside of installation department 311 has installation cavity 3111, and the front end of installation department 311 is seted up intercommunication installation cavity 3111 and external opening (not shown in the figure), is provided with push rod 33 in installation cavity 3111, and the both ends of push rod 33 are towards fore-and-aft direction respectively, and push rod 33 can be in installation cavity 3111 back-and-forth movement, and the front end of push rod 33 can stretch out installation cavity 3111 through the opening.

Referring to fig. 6, a first hinge shaft 34 is fixedly installed in the installation cavity 3111, the first hinge shaft 34 is transversely disposed and perpendicular to the push rod 33, the movable handle 32 is hinged to the installation part 311 through the first hinge shaft 34, and both ends of the movable handle 32 can rotate around the first hinge shaft 34. One end of the movable handle 32 extends into the mounting cavity 3111 and is movably connected with the rear end of the push rod 33, the end is provided with a connection long hole 321 along the length direction, a second hinge shaft 35 parallel to the first hinge shaft 34 penetrates through the connection long hole 321, and the rear end of the push rod 33 is hinged with the movable handle 32 through the second hinge shaft 35 and can slide along the connection long hole 321. Rotating the movable handle 32 about the first hinge shaft 34 toward the handle portion 312, the movable handle 32 can push the push rod 33 to move the protrusion opening forward in the mounting cavity 3111.

Referring to fig. 6 and 7, the front end of the push rod 33 is provided with an extending portion 331 and a limiting portion 332 extending forward, the extending portion 331 and the limiting portion 332 are disposed up and down with a mounting gap 333 left therebetween, and the front side of the limiting portion is provided with a front concave limiting arc surface 3321. The front end of the push rod 33 is further provided with a pressure head 36, the pressure head 36 comprises a middle part 361 and force applying ends 362 integrally connected with the left side and the right side of the middle part 361, and the two force applying ends 362 and the middle part 361 are connected into a U-shaped structure. The middle portion 361 of the ram 36 is disposed in the mounting gap 333, the two force applying ends 362 are disposed forward and respectively correspond to the two recesses 22 of the tibial prosthetic component, and the front ends of the two force applying ends 362 may be disposed in an arc-shaped configuration that is adapted to the two recesses 22. The mounting portion 311 has relief grooves 3112 formed on both sides of the opening thereof to relieve the two force applying ends 362 of the ram 36.

Referring to fig. 6 and 7, a vertically arranged third hinge shaft 334 is mounted on the extension 331, the middle portion 361 of the pressing head 36 is hinged with the push rod 33 through the third hinge shaft 334, and the pressing head 36 can rotate around the third hinge shaft 334, so that two force application ends 362 of the pressing head can simultaneously abut against the two grooves 22 of the tibial tray 1, and the tibial tray 1 is balanced in force. The middle part 361 of the pressure head 36 is provided with a limiting groove 363, the limiting groove 363 is matched and clamped with the limiting part 332 of the push rod 33, the side surface facing the rear side in the limiting groove 363 is a rear limiting cambered surface 3631, and the rear limiting cambered surface 3631 is abutted with the front limiting cambered surface 3321 to limit the rotation amplitude of the pressure head 36.

Referring to fig. 6, an inclined guide member is further fixedly connected in the mounting cavity 3111, the guide member may be two guide pins 37, the two guide pins 37 are spaced apart from each other and perpendicular to the push rod 33, a connecting line between the two guide pins 37 is inclined in a direction approaching to the positioning hook 313, a guide long hole 335 is formed in the push rod 33 along the length direction thereof, and the two guide pins 37 are fitted in the guide long hole 335, so that the push rod 33 moves in the inclined direction of the guide member. The indenter 36 can apply a pushing force to the tibial pad 2 in a direction toward the tibial pad 2, which makes it easier for the posterior flange 212 of the tibial pad 2 to snap into the posterior socket 112 of the tibial tray 1.

Referring to fig. 6, an elastic member, which may be a spring sheet 38, a spring, or the like, is disposed between the movable handle 32 and the handle portion 312. In this application, the elastic member includes two elastic pieces 38, and a certain included angle is formed between the two elastic pieces 38. The ends of the two elastic sheets 38 far away from each other can be fixedly connected with the movable handle 32 and the handle part 312 through screws respectively, and the ends of the two elastic sheets 38 close to each other are inserted through the protrusions and the grooves 22 and can rotate relatively. After the movable handle 32 approaches the handle part 312, the two elastic sheets 38 can push the movable handle 32 to reset, so that the use is convenient, and the two elastic sheets 38 can be rotatably inserted to generate smaller bending stress and have longer service life.

The assembly of the tibial prosthetic component using the compression device is performed as follows: firstly, the front flange 211 of the tibia pad 2 is clamped into the front clamping groove 111 of the tibia tray 1, and the positioning hook 313 of the pressing-in device is inserted into the slot 213 of the tibia pad 2 and clamped with the hook groove 113; then, the movable handle 32 is rotated, the push rod 33 pushes the pressing head 36 to move towards the oblique front direction close to the positioning hook 313 under the restriction of the two guide pins 37, so that the two force applying ends 362 of the pressing head 36 are respectively inserted into the two grooves 22 of the tibial pad 2, and simultaneously, force is applied to the tibial pad 2, the rear flange 212 of the tibial pad 2 is pressed into the rear clamping groove 112 of the tibial tray 1, and the assembly of the tibial pad 2 and the tibial tray 1 is completed. The installation mode of impressing can avoid the shank to hold in the palm 1 vibrations not hard up to reduce and cause not hard up the possibility in knee joint prosthesis later stage, reduce the revision rate of prosthesis, reduce patient's economic loss and health wound and pain.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a tibial prosthesis subassembly, includes tibial tray (1) and tibial pad (2), be provided with depressed part (11) on tibial tray (1), tibial pad (2) be provided with depressed part (11) joint and clearance fit's bellying (21), its characterized in that: the front side surface of the concave part (11) is provided with a front clamping groove (111), the rear side surface of the concave part is provided with a rear clamping groove (112), the front side surface of the convex part (21) is provided with a front flange (211) matched and clamped with the front clamping groove (111), and the rear side surface of the convex part is provided with a rear flange (212) matched and clamped with the rear clamping groove (112); the back side of the tibia pad (2) is provided with an insertion groove (213) communicated with the concave portion (11), the back side of the concave portion (11) is provided with a hook-shaped groove (113) communicated with the insertion groove (213), the back side of the tibia pad (2) is provided with two grooves (22), and the two grooves (22) are located on the left side and the right side of the insertion groove (213).

2. The tibial prosthetic component of claim 1, wherein: preceding draw-in groove (111) with between preceding flange (211) and back draw-in groove (112) with be the inclined plane cooperation between back flange (212), and constitute the forked tail structure, the angle of the contained angle that preceding draw-in groove (111) formed is greater than the angle of the contained angle that preceding flange (211) formed, and the angle of the contained angle that back draw-in groove (112) formed is the same with the contained angle that back flange (212) formed, and is greater than the angle of the contained angle that preceding draw-in groove (111) formed.

3. The tibial prosthetic component of claim 1, wherein: the height of the tibial tray (1) at the front side part of the recess (11) is larger than that at the back side part of the recess (11); the left end and the right end of the front side of the concave part (11) are provided with splayed flaring openings, and the left end and the right end of the front side of the convex part (21) are also provided with corresponding splayed flaring openings; the bottom surface of the concave part (11) can be subjected to high polishing treatment; a marrow cavity rod (12) is arranged on the bottom surface of the tibia support (1), the marrow cavity rod (12) is inserted into a marrow cavity of a tibia during installation, and the bottom end of the marrow cavity rod (12) can be arranged into an arc structure; a medullary cavity wing (14) fixedly connected with the bottom surface of the tibia support (1) is fixed on the side surface of the medullary cavity rod (12), and the medullary cavity wing (14) is gradually narrowed from top to bottom; the bottom end of the tibia support (1) is provided with a plurality of lugs (13) with the same height.

4. A press-in device characterized in that: including main part (31) and activity handle (32), main part (31) include installation department (311) and connect handle portion (312) at installation department (311) rear end, installation cavity (3111) have in installation department (311), be provided with push rod (33) of back-and-forth movement in installation cavity (3111), activity handle (32) are articulated with main part (31) through first articulated shaft (34) of fixing on main part (31), installation cavity (3111) is stretched into to the one end of activity handle (32), and with the rear end swing joint of push rod (33), wind first articulated shaft (34) rotate activity handle (32) are close to handle portion (312), activity handle (32) promote push rod (33) move forward and stretch out installation cavity (3111), the handle portion (312) one end of keeping away from of installation department (311) is provided with location hook (313) towards the front side, the positioning hook (313) can extend into the slot (213) of the tibial prosthesis component of claim 1 and is matched and clamped with the hook-shaped groove (113).

5. Press-in device according to claim 4, characterised in that: the one end of activity handle (32) that stretches into installation cavity (3111) has seted up along its length direction and has connected slot hole (321), wear to be equipped with second articulated shaft (35) in connecting slot hole (321), push rod (33) rear end pass through second articulated shaft (35) with activity handle (32) are articulated and slide along connecting slot hole (321) direction.

6. Press-in device according to claim 4, characterised in that: the mounting cavity (3111) is internally and fixedly connected with an inclined guide piece, the guide piece inclines towards the direction close to the positioning hook (313), and the push rod (33) is provided with a guide long hole (335) in sliding fit with the guide piece.

7. Press-in device according to claim 6, characterised in that: the guide piece comprises two guide pins (37) which are arranged at intervals, and a connecting line between the two guide pins (37) inclines towards the direction close to the positioning hook (313).

8. Press-in device according to claim 4, characterised in that: the front end of the push rod (33) is provided with a pressure head (36) with a U-shaped structure, and two ends of the pressure head (36) are arranged forwards and are respectively matched and spliced with the two grooves (22) of the tibia pad (2).

9. The press-in device according to claim 8, characterized in that: the front end of the push rod (33) is provided with a third hinge shaft (334) which is vertically arranged, and the third hinge shaft (334) is hinged with the middle of the pressure head (36).

10. Press-in device according to claim 4, characterised in that: the utility model discloses a handle, including main part (31), activity handle (32) with be provided with the elastic component between handle portion (312) of main part (31), the elastic component includes two shell fragment (38) that are the contained angle setting, two the one end of shell fragment (38) respectively with activity handle (32) and handle portion (312) fixed connection, two the other end of shell fragment (38) is the cooperation of pegging graft each other.