CN216318227U - Device for assembling tibia pad and tibia support - Google Patents

Abstract

The utility model discloses a device for assembling a tibia pad and a tibia tray, comprising: a body; an extension part extending from the body to the far side, wherein the far end of the extension part forms a stop part towards the lower part; the push rod is arranged behind the stop component, penetrates through the body and extends along the front-back direction, and the far end of the push rod is provided with a cushion block opposite to the stop component; a unidirectional drive mechanism disposed within the body for unidirectionally intermittently advancing the pusher bar distally; the upper end of the trigger is jointed with the one-way driving mechanism and used for actuating the one-way driving mechanism; and a locking member configured to hold the push rod in engagement with the one-way drive mechanism in a locked state and to enable the push rod to be disengaged from the one-way drive mechanism in an unlocked state. The trigger is pulled to actuate the one-way driving mechanism, and the push rod is pushed to assemble the tibial tray and the tibial pad between the cushion block and the stop component; the structure design of a pistol type is realized, and the operation is convenient as long as a trigger is pulled; the trigger is a lever, so that the operation is labor-saving.

Description

Device for assembling tibia pad and tibia support

Technical Field

The present invention relates to surgical instruments and, more particularly, to a device for assembling a tibial pad and a tibial tray.

Background

Arthroplasty is a well-known surgical procedure used to replace a patient's damaged natural joint with a prosthetic joint. A typical knee prosthesis includes a patella prosthetic component, a tibial tray, a femoral component, and a polymer insert or support positioned between the tibial tray and the femoral component. The tibia prosthesis comprises a metal tibia support and a plastic tibia pad, and the tibia support and the tibia pad are mutually clamped and connected. In order to firmly connect the tibial tray and the tibial pad, the clamping part of the tibial tray and the tibial pad is designed to be tight, and the problem is that a surgeon needs to exert great force to push the tibial pad into the tibial tray.

SUMMERY OF THE UTILITY MODEL

To solve at least one technical problem of the prior art, the present invention provides an apparatus for assembling a tibial pad and a tibial tray.

An apparatus for assembling a tibial pad and a tibial tray, comprising: a body; an extension part extending from the body to the far side, wherein the far end of the extension part forms a stop part towards the lower part; the push rod is arranged behind the stop component, penetrates through the body and extends along the front-back direction, and the far end of the push rod is provided with a cushion block opposite to the stop component; a unidirectional drive mechanism disposed within the body for unidirectionally intermittently advancing the pusher bar distally; the upper end of the trigger is jointed with the one-way driving mechanism and used for actuating the one-way driving mechanism; and a lock member configured to hold the push rod in engagement with the one-way drive mechanism in a locked state and configured to enable the push rod to be disengaged from the one-way drive mechanism in an unlocked state.

The beneficial effects of the embodiment are as follows: the one-way driving mechanism is actuated by pulling the trigger, so that the push rod moves forwards in a one-way manner, and the tibial tray and the tibial pad which are arranged between the cushion block and the stop component are assembled; due to the pistol type structural design, the operation of a surgeon is facilitated by pulling a trigger; the trigger is equivalent to a lever, and can push the tibial pad into the tibial tray in a labor-saving way.

In some embodiments, the outer wall of the push rod is axially arranged with ratchet teeth, the one-way drive mechanism comprises a fixed position non-return pawl and a push block movable back and forth, the push block has a driving pawl, the trigger is engaged with the push block, and in the locked state, the non-return pawl and the driving pawl are respectively engaged with the ratchet teeth. The push rod is pushed forwards by the driving pawl through the sliding push block, meanwhile, the non-return pawl prevents the push rod from retreating, the one-way intermittent transmission has the advantage, and a surgeon can stop at any time to observe the assembly state.

In some embodiments, the non-return pawl is rotatably connected to the body below the push rod, the claw head of the non-return pawl is disposed forward relative to the claw tail, the claw tail of the non-return pawl is applied with a forward force by the second spring, and in the locked state, the claw head of the non-return pawl is engaged with the ratchet; the driving pawl is rotatably connected with the push block below the push rod, the pawl head of the driving pawl is arranged in front relative to the pawl tail, the pawl tail of the driving pawl is exerted forward force by the first spring, and the pawl head of the driving pawl is meshed with the ratchet in a locking state.

In some embodiments, the locking member is configured to limit the rotation of the push rod against the push rod in a state where the ratchet is engaged with the active pawl and the check pawl; the lock member is also configured to be able to disengage the push rod to release the rotation restriction of the push rod.

In some embodiments, the push rod is a round rod and has a flat section formed on a surface thereof extending in an axial direction of the push rod, the locking member is rotatably provided on the body, the locking member includes a shift rod provided outside the body and a locking plate connected to the shift rod, an end portion of the locking plate is close to the flat section in a state where the check pawl is engaged with the ratchet, an end of the locking plate close to the flat section is provided with an arc-shaped notch facing the flat section, and the locking plate is configured to rotate around a central axis perpendicular to the flat section at a position opposite to the flat section.

In some embodiments, the locking device further comprises a limiting part, at least part of the limiting part is located in a quarter-cylinder area swept by the locking plate in the process of rotating by 90 degrees from a state that a generating line of the arc-shaped notch is perpendicular to the push rod to a state that the generating line of the arc-shaped notch is parallel to the push rod, and two side plane boundaries of the quarter-cylinder area are respectively aligned with the surfaces of the corresponding limiting parts.

In some embodiments, the deflector rod is provided with an elastically telescopic positioning pin, and the surface of the body is provided with a first positioning groove and a second positioning groove which can be in concave-convex fit with the telescopic end of the positioning pin; in a locking state, the positioning pin is matched with the first positioning groove; and in an unlocking state, the positioning pin is matched with the second positioning groove.

In some embodiments, the lower trigger part is provided with a torsion spring which applies a forward force to the lower trigger part; the upper half part of the trigger is provided with a pair of trigger arms arranged at intervals, the end parts of the trigger arms are provided with notches, the left side and the right side of the push block are provided with pins, the push block is arranged between the two trigger arms, and the pins are respectively and freely inserted into the notches of the corresponding trigger arms.

In some embodiments, the stop member comprises a first member and a second member, the second member is disposed behind the first member, the upper end of the second member is rotatably connected to the extending portion, a fixing pin is disposed at the rear side of the first member, the fixing pin passes through the second member and is provided with a limiting protrusion at the free end thereof for limiting the second member to separate from the fixing pin, and a return spring sleeved on the fixing pin is further disposed between the first member and the second member.

In some embodiments, the anterior surface of the spacer is configured in an arc that conforms to the posterior edge of the tibial pad, the spacer is made of plastic, and the spacer is snapped onto a metal base that is pinned to the anterior end of the pusher rod.

Drawings

Fig. 1 is a perspective view of a device for assembling a tibial pad and a tibial tray according to an embodiment of the present invention.

Fig. 2 is an exploded view of a device for assembling a tibial pad and a tibial tray according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of an apparatus for assembling a tibial pad and a tibial tray in accordance with an embodiment of the present invention.

Fig. 4 is a top view of a device for assembling a tibial pad and a tibial tray according to an embodiment of the present invention in an unlocked state.

Fig. 5 is a view of BB in fig. 4 in cross section.

Fig. 6 is a top view of a device for assembling a tibial pad and a tibial tray according to an embodiment of the present invention in a locked state.

Fig. 7 is a cross-sectional view of CC of fig. 6.

Description of the symbols:

the locking device comprises a body 1, an extension part 2, a push rod 3, a handle 4, a trigger 5, a locking part 6, a stop part 7, a cushion block 8, a first accommodating cavity 9, a first hole 10, a non-return pawl 11, a push block 12, an active pawl 13, a ratchet 14, a second accommodating cavity 15, a second hole 16, a first pin shaft 17, a first spring 18, a second pin shaft 19, a second spring 20, a third pin shaft 21, a trigger arm 22, a torsion spring 23, a notch 24, a pin 25, a locking plate 26, a shift lever 27, a rotating pin 28, an arc notch 29, a plain section 30, a positioning pin 31, a first positioning groove 32, a second positioning groove 33, a metal base 34, a pin 35, a first part 36, a second part 37, a fixing pin 38, a limiting protrusion 39, a return spring 40, a side wall 41, a side plate 42 and a limiting part 43

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model provides a device for assembling a tibia pad and a tibia support, which is in a pistol shape convenient to operate in appearance, and the operation of pushing the tibia pad into the tibia support is performed by pulling a trigger 5, so that the operation is simple and labor-saving.

Fig. 1 is a perspective view of a device for assembling a tibial pad and a tibial tray according to some embodiments. As can be seen from fig. 1, the device for assembling a tibial pad and a tibial tray comprises a body 1, an extension 2 extending distally from the body 1, a push rod 3 extending through the body 1 and in a front-rear direction, a grip 4 and a trigger 5 disposed below the body 1, and a locking member 6. The far end of the extension part 2 forms a stop part 7 towards the lower part, the push rod 3 is arranged behind the stop part 7, and the far end of the push rod 3 is provided with a cushion block 8 opposite to the stop part 7. The body 1 has a one-way drive mechanism therein which engages the pusher rod 3 for intermittently pushing the pusher rod 3 distally in one way. The trigger 5 is engaged with a one-way drive mechanism which is triggered when the trigger 5 is pulled, causing the one-way drive mechanism to push the push rod 3 towards the stop member 7. Manual operation of the locking member 6 can bring the locking member 6 into the locked state and the unlocked state, respectively. In the locked state, the locking member 6 keeps the push rod 3 in an engaged state with the one-way driving mechanism by restraining the push rod 3, so that the one-way driving mechanism can transmit the trigger of the trigger 5 to the push rod 3 to intermittently push the push rod 3 distally in one way; in the unlocked state, the locking member 6 disengages the push rod 3, disengaging the push rod 3 from the one-way drive mechanism.

When the device is used for assembling the tibial tray and the tibial pad, the front edge of the tibial pad is put into the notch of the tibial tray in advance, then the tibial tray is backed against the stop part 7, the cushion block 8 is abutted against the rear edge of the tibial pad, and then the push rod 3 is pushed to the far side intermittently by repeatedly pulling the trigger 5, so that the tibial pad is pushed into the tibial tray step by step.

Fig. 2 shows an exploded view of some embodiments of a device for assembling a tibial pad and a tibial tray. Fig. 3 shows a longitudinal cross-section of some embodiments of the device for assembling the tibial pad and the tibial tray, i.e., section AA in fig. 4. Referring to fig. 2, the body 1 includes a side panel 41 surrounded from the front, top and back sides and a side panel 43 disposed at the two sides of the side panel, wherein the side panel 41 and the side panel 42 surround the first receiving cavity 9 shown in fig. 3. Referring to fig. 2 and 3, the front end and the rear end of the body 1 are respectively provided with first holes 10 aligned with each other, and the push rod 3 passes through the pair of first holes 10 and is in clearance fit with the first holes 10. The pair of first holes 10 keeps the push rod 3 axially movable with respect to the body 1 along the first holes 10, also limiting the translation of the push rod 3 in the radial direction of the first holes 10.

A one-way driving mechanism is arranged in the first containing cavity 9 of the body 1 and is configured to receive power input by the trigger 5 and intermittently push the push rod 3 distally in one way. For example, referring to fig. 2 and 3, the one-way driving mechanism includes a fixed non-return pawl 11 and a push block 12 movable back and forth, wherein the push block 12 has an active pawl 13. Ratchet teeth 14 are axially arranged on the outer wall of the push rod 3, and the non-return pawl 11 and the driving pawl 13 are respectively meshed with the ratchet teeth 14 to realize the engagement of the push rod 3 and the one-way driving mechanism.

Referring to fig. 3, the push block 12 is sleeved on the push rod 3, specifically, the push block 12 has a hollow second receiving cavity 15 therein, the front end and the rear end of the push block 12 are respectively provided with a second hole 16, and the push rod 3 passes through the pair of second holes 16 and is in clearance fit with the pair of second holes 16, so that the push block 12 can slide along the axial direction of the push rod 3.

Referring to fig. 2 and 3, a rotatable driving pawl 13 is disposed in the second receiving cavity 15, for example, the driving pawl 13 is rotatably connected to the push block 12 through a first pin 17 perpendicular to the axial direction of the push rod 3. The active pawl 13 is biased by a first spring 18, specifically, a first pin 17 is arranged between the head and the tail of the active pawl 13, the head of the active pawl 13 is arranged forward relative to the tail, the head of the active pawl 13 is engaged with the ratchet 14 on the push rod 3, the tail of the active pawl 13 is connected with the first spring 18, the other end of the first spring 18 is connected with the push block 12 at a position in front of the tail, so that the first spring 18 applies a forward biasing tension to the tail of the active pawl 13, and the head of the active pawl 13 has a backward biasing tendency.

Referring to fig. 2 and 3, the check pawl 11 is rotatably disposed in the first receiving cavity 9 of the body 1, for example, the check pawl 11 is rotatably connected to the body 1 by a second pin 19 perpendicular to the axial direction of the push rod 3. The non-return pawl 11 is biased by a second spring 20, specifically, a second pin 19 is provided between the head and the tail of the non-return pawl 11, the head of the non-return pawl 11 is disposed forward relative to the tail, the head of the non-return pawl 11 is engaged with the ratchet 14 on the push rod 3, and the tail of the non-return pawl 11 is connected to the second spring 20, and the other end of the second spring 20 is connected to the body 1 at a position forward of the tail, so that the second spring 20 applies a forward biasing tension to the tail of the non-return pawl 11, and the head of the non-return pawl 11 has a rearward biasing tendency.

During the process that the pushing block 12 is pushed forwards by the trigger 5, the active pawl 13 is meshed with the ratchet 14 on the push rod 3, the push rod 3 is pushed forwards by the pushing block 12, the check pawl 11 is stirred by the ratchet 14 to rotate and is disengaged from the ratchet 14, and therefore the check pawl 11 does not prevent the movement of the push rod 3. During the reverse movement of the pushing block 12, the non-return pawl 11 is engaged with the ratchet 14 to prevent the push rod 3 from moving backwards, and the driving pawl 13 is rotated by the ratchet 14 and disengaged from the ratchet 14, so that the pushing block 12 can move backwards while the push rod 3 is kept still.

The grip 4 is fixed to the body 1 and extends downward of the body 1, and the trigger 5 is rotatably provided on the body 1 in front of the grip 4. Specifically, the trigger 5 is pivotally connected to the body 1 by a third pin 21 extending in the left-right direction, and the trigger 5 is configured as a lever that pivots about the third pin 21. The lower half of the trigger 5 is longer than the upper half for saving effort in operation. The upper half of the trigger 5 projects from the bottom of the body 1 into the first receiving chamber 9. The upper half of the trigger 5 is a pair of spaced trigger arms 22, and a third pin 21 passes through the pair of trigger arms 22. The lower half of the trigger 5 is provided with a torsion spring, specifically, a torsion spring 23 is sleeved on the third pin 21, one end of the torsion spring 23 is abutted against the rear side of the trigger 5, and the other end is abutted against the front side of the grip 4, so that a forward force is applied to the lower half of the trigger 5. When the external force is removed after the trigger 5 is pulled, the torsion spring 23 resets the trigger 5.

Referring to FIG. 3, the upper end of the trigger 5 is configured to engage the push block 12, allowing the trigger 5 to rotate to move the push block 12. Specifically, the end of the trigger arm 22 of the trigger 5 is provided with a notch 24, the left and right sides of the push block 12 are provided with pins 25, the push block 12 is interposed between the two trigger arms 22, and the pins 25 are respectively inserted freely into the notches 24 of the corresponding trigger arms 22. Since the push block 12 is fitted over the push rod 3 and the push rod 3 is restrained in the vertical direction thereof, the push block 12 is also restrained in the direction perpendicular to the push rod 3, so that the trigger 5 and the push block 12 can always maintain this engagement. The engagement of the trigger 5 with the push block 12 allows the pin 25 to move within the notch 24, thereby allowing the rotational movement of the trigger 5 to be converted into linear movement of the push rod 3. In some embodiments, the range of rotation of the trigger 5 is configured to advance the push rod 3 one ratchet tooth 14 pitch per trigger 5 pull. The stroke of the pusher 12 is related to the angular range of rotation of the trigger 5, and the extension of the notch 24 along the length of the trigger arm 22 limits the angular range of rotation of the trigger 5, so that the length of the notch 24 can be selected to achieve a desired advance step of the push rod 3.

When the trigger 5 is not actuated, the torsion spring 23 biases the trigger 5 in an initial state with the push block 12 against the rear end of the body 1. When the trigger 5 is pulled, the trigger 5 rotates counterclockwise around the third pin 21, and the trigger arm 22 pushes the push block 12 forward, so as to push the push rod 3 forward.

The lock member 6 is rotationally switched between the locked state and the unlocked state. Rotating the locking member 6 by 90 ° clockwise or counterclockwise can switch the locking member 6 back and forth between the locked state and the unlocked state. In the locked state, the locking member 6 restricts rotation of the push rod 3 while maintaining the push rod 3 in engagement with the active pawl 13 and the non-return pawl 11, and incrementally pushing the tibial pad into the tibial tray by repeatedly pulling the trigger 5. In the unlocked state, locking member 6 releases the constraint on pushrod 3, and the user can rotate pushrod 3 to disengage pushrod 3 from active pawl 13 and non-return pawl 11, and manually push pushrod 3 backwards to remove the tibial tray from the device.

Figure 4 illustrates a top view of the device in an unlocked state in some embodiments. Fig. 5 is a partial cross-sectional view of BB in fig. 4. Figure 5 illustrates a top view of the device in a locked state in some embodiments. Fig. 6 is a partial cross-sectional view of section CC in fig. 5. Referring to fig. 2, the push rod 3 is a round rod, and its surface has a flat cut surface 30 extending in the axial direction in addition to the ratchet 14 arranged in the axial direction. Referring to fig. 2, the locking member 6 includes a locking piece 26 located inside the body 1 and a lever 27 located on the surface of the body 1, and one end of the locking piece 26 is connected to one end of the lever 27 through a rotating pin 28. The locking element 6 is rotatably arranged on the body 1, in particular the pivot pin 28 extends through the wall of the body 1 in a direction perpendicular to the plane 30 and can be rotated relative to the body 1 about the central axis of the pivot pin 28, so that the rotational movement of the lever 27 can bring the locking tab 26 to rotate about the central axis of the pivot pin 28. With continued reference to fig. 2 and 3, the locking tab 26 extends along its rotation axis toward the planar section 30, and the end of the locking tab 26 is adjacent to the planar section 30 and forms an arc-shaped notch 29 facing the planar section 30. When the lever 27 is rotated, the locking piece 26 rotates about a central axis perpendicular to the plane 30 at a position opposite to the plane 30 to keep the end of the locking piece 26 rotatable close to the plane 30. The inner wall of the arc-shaped notch 29 is cylindrical, so that the arc-shaped notch 29 defines a generatrix, and the generatrix of the arc-shaped notch 29 can be switched between two states of being parallel to the push rod 3 and being perpendicular to the push rod 3 by rotating the locking piece 26. Referring to fig. 7, the locking member 6 is configured such that when the push rod 3 is engaged with the driving pawl 13 and the check pawl 11, respectively, and the locking piece 26 is rotated until the generatrix of the arc-shaped notch 29 is perpendicular to the axial direction of the push rod 3, the end plane portions of the locking piece 26 are completely opposed to the flat cut surfaces 30 and abut against each other, and the push rod 3 is restricted from rotating against the flat cut surfaces 30, thereby holding the push rod 3 in the engaged state with the driving pawl 13 and the check pawl 11. Referring to fig. 6, the locking member 6 is further configured such that when the locking piece 26 is rotated until the generatrix of the arc-shaped notch 29 is parallel to the axial direction of the push rod 3, the arc-shaped notch 29 of the locking piece 26 is matched with the circular outer contour of the push rod 3, the end planar portion of the locking piece 26 is no longer opposite to the planar surface 30, gaps are formed between the end portions of the locking piece 26 and the push rod 3, and the locking piece 26 is separated from the push rod 3 to release the rotation restriction of the push rod 3, so that the push rod 3 can rotate freely.

The locking member 6 is configured to rotate within an angular range of 0-90 deg., the two extreme positions of rotation corresponding to the locked state and the unlocked state, respectively. When locking and unlocking, a user only needs to rotate the locking component 6 to the limit position, and whether the locking component 6 rotates in place does not need to be judged from the rotation angle. The device further comprises a limiting portion 43 for limiting the range of the rotation angle of the locking member 6 to 0-90 deg.. In the locking state, the generatrix of the arc notch 29 is perpendicular to the axial direction of the push rod 3; in the unlocked state, the generatrix of the arc-shaped notch 29 is parallel to the axial direction of the push rod 3. That is, the lock piece 26 is rotated clockwise or counterclockwise by 90 ° to switch the lock member 6 between the locked state and the unlocked state. During rotation of the locking tab 26 through 90 °, the area swept by the locking tab 26 in space forms two quarter-cylindrical regions. Part or all of the stopper portion 43 is located in one of the quarter-cylindrical regions, and the side plane boundaries of the quarter-cylindrical region are aligned with the corresponding stopper portion surfaces, respectively. For example, referring to fig. 3, 5 and 7, the limiting portion 43 is a cylindrical pin, one end of the cylindrical pin is connected to the side plate 42 on the right side of the body 1, the other end of the cylindrical pin extends to the left of the quarter-cylindrical area, the end of the cylindrical pin extends to one side plane boundary of the quarter-cylindrical area, and the side wall of the cylindrical pin is tangent to the other side plane boundary of the quarter-cylindrical area, so that the cylindrical shape can limit the rotation of the locking plate 26 within the range of 0-90 °.

The shift lever 27 extends in a direction perpendicular to the generatrix of the arc-shaped notch 29. When the shift lever 27 is rotated to extend laterally, the locking member 6 is in an unlocked state, as shown in fig. 4; when the shift lever 27 is rotated by 90 ° to extend rearward, the lock member 6 is in a locked state, as shown in fig. 6. The locking element 6 is arranged in such a way that it is more adapted to the operating habits of the surgeon in the housing. Of course, the angle and the extension direction of the shift lever 27 in the locked state may have other configurations.

Further, referring to fig. 2, the locking member 6 further includes an elastically stretchable positioning pin 31, and the surface of the body 1 is further provided with a first positioning groove 32 and a second positioning groove 33 that can be in concave-convex fit with a stretching end of the positioning pin 31. The first and second positioning grooves 32 and 33 may be tapered so that the positioning pin 31 can be moved away from the positioning grooves when the locking member 6 is rotated with a slight force. The first detent 32 corresponds to the locked state and the second detent 33 corresponds to the unlocked state. A positioning pin 31 is provided at one end of the shift lever 27 in parallel with the pivot pin 28, and the positioning pin 31 can rotate around the pivot pin 28 when the shift lever 27 is rotated. When the locking member 6 is rotated to the locking state, the positioning pin 31 is just rotated to the first positioning groove 32; when the locking member 6 is rotated to the unlocked state, the positioning pin 31 is just rotated to the second positioning groove 33. The positioning pin 31 can indicate whether the locking member 6 is rotated in place, and can maintain the locking member 6 in a locked or unlocked state after being in place.

In fig. 3, the driving pawl 13 and the check pawl 11 are disposed below the push rod 3, the ratchet 14 and the flat surface 30 are disposed at opposite sides of the push rod 3, respectively, and the locking member 6 is disposed at an upper portion of the body 1. In some embodiments, the locking member 6 may also be disposed on the side of the body 1 with the flat cut face 30 disposed at 90 ° relative to the ratchet teeth 14.

The anterior surface of the spacer 8, opposite the stop member 7, is configured in an arc that conforms to the posterior edge of the tibial pad. Referring to fig. 1 and 2, the spacer 8, which may be made of plastic, is snapped onto a metal base 34, the metal base 34 being attached to the front end of the pusher 3. The metal base 34 is not completely rigidly connected to the push rod 3, for example, the metal base 34 is connected to the push rod 3 by a pin 35, so that the metal base 34 can be loosened to a slight extent.

Referring to fig. 1, the stop member 7 includes a first member 36 and a second member 37, wherein the first member 36 is made of metal and is integrated with the extension portion 2. The second member 37, which may be made of plastic, is disposed behind the first member 36, and the upper end of the second member 37 is rotatably connected to the extension 2. The rear side of the first part 36 is provided with a fixing pin 38, the fixing pin 38 passes through the second part 37 and is provided with a stopper projection 39 at the free end of the fixing pin 38 for restricting the second part 37 from being detached from the fixing pin 38. A return spring 40 is also provided between the first part 36 and the second part 37, which spring is fitted over the fixing pin 38. The stop part 7 is used for stopping the gasket, and when the gasket is pushed in, a doctor is provided with an observation of whether the gasket is pushed in or not, and the pushing effect of the gasket can be observed.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the utility model.

Claims (10)

1. An apparatus for assembling a tibial pad and a tibial tray, comprising:

a body;

an extension extending distally from the body, a distal end of the extension forming a stop feature downward;

the push rod is arranged behind the stop component, penetrates through the body and extends along the front-back direction, and a cushion block opposite to the stop component is arranged at the far end of the push rod;

a unidirectional drive mechanism disposed within the body for unidirectionally intermittently advancing the pusher bar distally;

the upper end of the trigger is jointed with the one-way driving mechanism and used for actuating the one-way driving mechanism; and

a lock member configured to hold the push rod in engagement with the one-way drive mechanism in a locked state and configured to enable disengagement of the push rod from the one-way drive mechanism in an unlocked state.

2. The device for assembling a tibial pad and a tibial tray of claim 1, wherein the push rod has ratchet teeth axially disposed on an outer wall thereof, the one-way drive mechanism comprises a fixed position non-return pawl and a forward and backward movable push block having a driving pawl, the trigger is engaged with the push block, and in the locked state, the non-return pawl and the driving pawl are respectively engaged with the ratchet teeth.

3. The device for assembling a tibial pad and a tibial tray of claim 2, wherein said non-return pawl is rotatably connected to said body below said push rod, a nose of said non-return pawl is disposed forward relative to a tail of said non-return pawl, a tail of said non-return pawl is urged forward by a second spring, and in said locked state, said nose of said non-return pawl engages said ratchet; the driving pawl is rotatably connected with the push block below the push rod, the claw head of the driving pawl is arranged forward relative to the claw tail, the claw tail of the driving pawl is exerted forward force by a first spring, and in the locking state, the claw head of the driving pawl is meshed with the ratchet.

4. The device for assembling a tibial pad and a tibial tray of claim 2, wherein said locking member is configured to limit said push rod from swiveling against said push rod in a state where said ratchet is engaged with said active pawl and said non-return pawl; the lock member is also configured to be capable of disengaging the push rod to release the rotation restriction of the push rod.

5. The device for assembling a tibial pad and a tibial tray according to claim 2 or 4, wherein the push rod is a round rod and has a flat cut surface formed on a surface thereof extending in an axial direction of the push rod, the locking member is rotatably provided on the body, the locking member includes a shift lever provided outside the body and a locking plate connected to the shift lever, an end of the locking plate is close to the flat cut surface in a state where the non-return pawl is engaged with the ratchet, an end of the locking plate close to the flat cut surface is provided with an arc-shaped notch facing the flat cut surface, and the locking plate is configured to rotate about a central axis perpendicular to the flat cut surface at a position opposite to the flat cut surface.

6. The device for assembling a tibial pad and a tibial tray according to claim 5, further comprising a stopper portion, at least a portion of which is located in a quarter-cylindrical area swept by the locking plate during a rotation of 90 ° from a state in which the generatrix of the arc-shaped notch is perpendicular to the push rod to a state in which the generatrix of the arc-shaped notch is parallel to the push rod, and both side plane boundaries of the quarter-cylindrical area are aligned with the surfaces of the stopper portion respectively.

7. The device for assembling a tibial pad and a tibial tray according to claim 5, wherein said stem has a resiliently retractable detent pin thereon, said body surface having a first detent groove and a second detent groove capable of engaging said retractable end of said detent pin; in the locked state, the positioning pin is matched with the first positioning groove; in the unlocked state, the positioning pin is matched with the second positioning groove.

8. The device for assembling a tibial pad and a tibial tray according to claim 2, wherein the lower half of the trigger is provided with a torsion spring that applies a forward force to the lower half of the trigger; the upper half part of the trigger is provided with a pair of trigger arms arranged at intervals, the end parts of the trigger arms are provided with notches, the left side and the right side of the push block are provided with pins, the push block is arranged between the two trigger arms, and the pins are respectively and freely inserted into the notches corresponding to the trigger arms.

9. The device for assembling a tibial pad and a tibial tray according to any one of claims 1 to 4, wherein the stop member comprises a first member and a second member, the second member is disposed behind the first member, an upper end of the second member is rotatably connected to the extension portion, a fixing pin is disposed on a rear side of the first member, the fixing pin passes through the second member and is provided with a stopper protrusion at a free end thereof to restrict the second member from being detached from the fixing pin, and a return spring fitted over the fixing pin is further disposed between the first member and the second member.

10. The device for assembling a tibial pad and a tibial tray according to any one of claims 1-4, wherein the anterior surface of the spacer is configured in an arc shape to fit the posterior edge of the tibial pad, the spacer is made of plastic, the spacer is snapped onto a metal base, and the metal base is attached to the anterior end of the pusher by a pin.

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