Knee joint thickness-adjustable gasket test mold

Abstract

The utility model discloses a knee joint thickness-adjustable gasket test mold, and relates to the technical field of medical instruments. A knee joint thickness-adjustable gasket test mold comprises a base used for being in contact fit with a tibial plateau; the ejection piece is located above the base, can move up and down relative to the base and is used for being in contact fit with the femoral condyle; the adjusting sliding block is arranged on the base in a sliding manner; the two ends of the connecting rod are hinged to the adjusting sliding block and the ejecting piece respectively. According to the thickness-adjustable gasket test mold for the knee joint, the sliding block is adjusted to move to drive the connecting rod to push or pull the ejector piece to move up and down relative to the base, so that the overall thickness of the gasket test mold can be adjusted, gasket test molds of different thicknesses do not need to be prepared for gasket test molds of different specifications, and in the operation process, the operation efficiency is improved. And the proper thickness of the gasket can be finally determined without disassembling and assembling the gasket test mold for many times.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a knee joint adjustable-thickness gasket test die. Background Technique

[0002] During knee joint replacement, it is necessary to osteotomize and remove the diseased or worn bone mass to facilitate the installation of artificial joint prostheses. For the diseased conditions of the general population, the thickness of the tibial replacement part of most artificial total knee joint prostheses is at least 6 mm. According to the amount of diseased bone mass removed from the tibial end by the tools used by the doctor during the operation, an artificial meniscus gasket with an appropriate thickness is selected for implantation. During the operation, the doctor uses surgical osteotomy instruments to perform horizontal osteotomy on the diseased bone mass at the proximal tibia, remove the diseased bone mass at the proximal tibia, and then install the test die of the thinnest artificial meniscus, observe the adaptation of the soft tissues around the knee joint, and perform flexion and extension movements of the knee joint. According to the evaluation, by adjusting or replacing the gaskets of the artificial meniscus test die with different thicknesses, it is confirmed that the gaps of the artificial joint prosthesis in the straight state and the flexed state are equal. Before the final replacement and installation, the thickness h of the artificial meniscus that needs to be finally replaced at the tibial end is determined to prepare for the replacement and installation of the artificial femoral joint.

[0003] In the use process of the existing knee joint adjustable-thickness gasket test die instrument, because the upper surface of some gaskets is designed with a concave arc, which matches the convex arc design of the surface of the femoral condyle, it cannot be well installed during installation. There are multiple gasket test dies with different thicknesses for one model specification, and the number of test dies will be very large. At the same time, for the existing gaskets of the same specification model, each gasket test die with a certain thickness is a piece of instrument. In the use process, when the thickness of the gasket test die is not appropriate, it needs to be taken out in turn and a gasket test die with an increased thickness is selected and placed again. In this process, the operation is cumbersome. In order to place the gasket test die with a concave arc design, it is necessary to stretch and pull the knee joint during the operation to increase the gap. Multiple stretches and pulls of the knee joint make the operation cumbersome, and it will more easily damage the soft tissues such as the ligaments around the knee joint, prolong the operation time, and increase the risk of infection, bringing great trouble to the doctor. Content of the Utility Model

[0004] The purpose of the utility model is to provide a knee joint adjustable-thickness gasket test die, which drives the adjustment slider to move through the adjustment screw, and then drives the meniscus gasket test die to lift, so as to determine the thickness of the artificial meniscus gasket.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions, including:

[0006] A knee joint adjustable-thickness gasket test die, including:

[0007] A base, which is used for contacting and cooperating with the tibial plateau;

[0008] A top piece, which is located above the base and can move up and down relative to the base, and is used for contacting and cooperating with the femoral condyle;

[0009] An adjustment slider, which is slidably arranged on the base;

[0010] A connecting rod, the two ends of which are respectively hinged to the adjustment slider and the top piece.

[0011] As a preferred solution of the above knee joint adjustable thickness spacer test mold, a lifting lug is provided on the top piece, hinge holes are provided on the adjustment slider and the lifting lug, pin shafts are respectively provided at the two ends of the connecting rod, and the pin shafts are hinged to the hinge holes.

[0012] As a preferred solution of the above knee joint adjustable thickness spacer test mold, it further includes:

[0013] A first support frame and a second support frame, the first support frame and the second support frame are spaced apart and arranged on the base;

[0014] An adjustment screw rod, the two ends of which are rotatably installed on the first support frame and the second support frame, the adjustment screw rod passes through the adjustment slider and is threadedly connected to the adjustment slider.

[0015] As a preferred solution of the above knee joint adjustable thickness spacer test mold, a first through hole and a first counterbore are provided on the first support frame, the first counterbore is located outside the first through hole, the adjustment screw rod includes a nut and a screw rod body, the screw rod body passes through the first through hole, and the nut is assembled in the first counterbore.

[0016] As a preferred solution of the above knee joint adjustable thickness spacer test mold, a second through hole and a second counterbore are provided on the second support frame, the second counterbore is located outside the second through hole, the adjustment screw rod includes a stop block, the screw rod body passes through the second through hole and the second counterbore, and the stop block is threadedly connected to the screw rod body and at least partially assembled in the second counterbore.

[0017] As a preferred solution of the above knee joint adjustable thickness spacer test mold, a height scale line is provided along the circumferential direction on the end face of the nut, the nut is assembled and connected to the first support frame, and an indicating line is provided on the first support frame.

[0018] As a preferred solution of the above knee joint adjustable thickness spacer test mold, an interface is provided on the end face of the nut, the interface is clamped with the joint of a wrench, and the wrench rotates to drive the nut to rotate.

[0019] As a preferred embodiment of the above knee joint adjustable thickness spacer test die, it further includes a limit guide sleeve and a limit guide post. One of the limit guide sleeve and the limit guide post is arranged on the base, and the other is arranged on the ejector. The limit guide post is inserted into the limit guide sleeve.

[0020] As a preferred embodiment of the above knee joint adjustable thickness spacer test die, at least two limit guide sleeves and at least two limit guide posts are respectively provided.

[0021] As a preferred embodiment of the above knee joint adjustable thickness spacer test die, at least one limit guide sleeve and at least one limit guide post are respectively arranged on both sides of the adjusting slider.

[0022] The beneficial effects of the present utility model are as follows:

[0023] For the knee joint adjustable thickness spacer test die of the present utility model, by moving the adjusting slider, the connecting rod is driven to push or pull the ejector to move up and down relative to the base, so that the overall thickness of the spacer test die can be adjusted. Therefore, it is not necessary to prepare multiple thicknesses of spacer test dies for each specification, and during the operation, it is not necessary to disassemble and assemble the spacer test die multiple times to finally determine the appropriate thickness of the spacer. Brief Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the knee joint adjustable thickness spacer test die in the embodiment of the utility model.

[0025] Figure 2 It is an exploded view of the knee joint adjustable thickness spacer test die in the embodiment of the utility model.

[0026] Figure 3 Schematic structural diagram of the base in the embodiment of the utility model.

[0027] Figure 4 Schematic structural diagram of the adjusting screw rod in the embodiment of the utility model.

[0028] Figure 5 Schematic structural diagram of the knee joint adjustable thickness spacer test die with the minimum thickness in the embodiment of the utility model.

[0029] Figure 6 Schematic structural diagram of the knee joint adjustable thickness spacer test die during the process of increasing the thickness in the embodiment of the utility model.

[0030] 1. Base; 2. Ejector; 21. Lifting lug;

[0031] 3. Adjusting slider;

[0032] 4. Connecting rod;

[0033] 5. First support frame; 51. First through hole; 52. First countersunk head groove; 53. Indicator line;

[0034] 6. Second support frame; 61. Second through hole; 62. Second countersunk head groove;

[0035] 7. Adjusting screw; 71. Nut; 711. Height scale line; 712. Interface; 72. Screw body; 73. Stopper;

[0036] 8. Limiting guide sleeve; 9. Limiting guide post; 10. Wrench. Detailed implementation mode

[0037] The following further elaborates on the utility model in conjunction with the attached drawings, so that those skilled in the art can implement it with reference to the text of the specification.

[0038] It should be understood that terms such as "having", "comprising", and "including" used herein do not exclude the presence or addition of one or other elements or their combinations.

[0039] As Figure 1-6 shown, this implementation mode provides a knee joint adjustable thickness spacer test die, which includes a base 1, a top piece 2, an adjusting slider 3, and a connecting rod 4. The base 1 is used for contact and cooperation with the tibial plateau. The top piece 2 is located above the base 1 and can move up and down relative to the base 1, and is used for contact and cooperation with the femoral condyle. The adjusting slider 3 is slidably arranged on the base 1. Both ends of the connecting rod 4 are hinged to the adjusting slider 3 and the top piece 2 respectively.

[0040] In the knee joint adjustable thickness spacer test die of this implementation mode, by moving the adjusting slider 3, the connecting rod 4 is driven to push or pull the top piece 2 to move up and down relative to the base 1, so that the overall thickness of the spacer test die can be adjusted. Therefore, it is not necessary to prepare multiple thickness spacer test dies for each specification, and during the surgical process, it is not necessary to disassemble and assemble the spacer test die multiple times to finally determine the appropriate thickness of the spacer.

[0041] Specifically, in this implementation mode, as Figure 2 shown, a lifting lug 21 is provided on the top piece 2, hinge holes are provided on the adjusting slider 3 and the lifting lug 21, pin shafts are respectively provided at both ends of the connecting rod 4, and the pin shafts are hinged to the hinge holes, thereby realizing smooth adjustment of the relative position between the top piece 2 and the base 1.

[0042] As Figure 1 and Figure 2As shown in the figure, the adjustable-thickness spacer trial mold for the knee joint of this embodiment further includes a first support frame 5, a second support frame 6, and an adjusting screw 7. The first support frame 5 and the second support frame 6 are spaced apart and arranged on the base 1. Both ends of the adjusting screw 7 are rotatably installed on the first support frame 5 and the second support frame 6. The adjusting screw 7 passes through the adjusting slider 3 and is threadedly connected to the adjusting slider 3. When the adjusting screw 7 rotates, since the adjusting slider 3 cannot rotate, the adjusting slider 3 can only move along the length direction of the adjusting screw 7. The movement of the adjusting slider 3 drives the movement of the connecting rod 4, thereby driving the top piece 2 to rise or fall relative to the base 1 through the connecting rod 4, so as to realize the adjustment of the thickness of the spacer trial mold to determine the appropriate thickness of the spacer without the need for multiple disassembly and assembly during the operation.

[0043] In this embodiment, as Figure 2 and 3 shown and locked, a first through hole 51 and a first counterbore 52 are provided on the first support frame 5. The first counterbore 52 is located outside the first through hole 51. The adjusting screw 7 includes a nut 71 and a screw body 72. The screw body 72 passes through the first through hole 51, and the nut 71 is assembled in the first counterbore 52. The nut 71 sinks into the first counterbore 52, making the structure compact and avoiding interference with other tissues due to protruding outside.

[0044] As Figure 2 and Figure 3 shown, a second through hole 61 and a second counterbore 62 are provided on the second support frame 6. The second counterbore 62 is located outside the second through hole 61. The adjusting screw 7 includes a stop block 73. The screw body 72 passes through the second through hole 61 and the second counterbore 62. The stop block 73 is threadedly connected to the screw body 72 and at least partially assembled in the second counterbore 62. In this embodiment, the diameters of both the stop block 73 and the nut 71 are larger than the diameter of the screw body 72. Therefore, it can prevent the screw body 72 from moving axially or even coming out.

[0045] As Figure 4 shown, a height scale line 711 is provided along the circumferential direction on the end face of the nut 71. The nut 71 is assembled and connected to the first support frame 5, and an indicating line 53 is provided on the first support frame 5. The thickness value of the trial mold adjustment can be determined by the change in the relative position between the indicating line 53 and the height scale line 711. The height scale line 711 can be calculated based on the pitch of the adjusting screw 7 and other factors to obtain the corresponding value.

[0046] As Figure 4 shown, an interface 712 is provided on the end face of the nut 71. The interface 712 is clamped with the joint of the wrench 10. The rotation of the wrench 10 drives the rotation of the nut 71. Among them, the interface 712 can be a hexagonal interface 712, a square interface 712, a plum blossom interface 712, etc., and the joint is correspondingly set as a joint of the corresponding shape.

[0047] In this embodiment, the meniscus spacer trial mold with adjustable thickness for the knee joint further includes a limit guide sleeve 8 and a limit guide post 9. One of the limit guide sleeve 8 and the limit guide post 9 is arranged on the base 1, and the other is arranged on the top part 2. The limit guide post 9 is inserted into the limit guide sleeve 8. The cooperation between the limit guide post 9 and the limit guide sleeve 8 can guide the up and down movement of the top part 2, avoiding unstable situations such as offset during the movement of the top part 2.

[0048] As Figure 1 and Figure 2 shown, in order to ensure the stability of the movement of the top part 2, there are at least two limit guide sleeves 8 and at least two limit guide posts 9 respectively. And at least one limit guide sleeve 8 and at least one limit guide post 9 are arranged on both sides of the adjusting slider 3 respectively. As shown in the figure, in this embodiment, there are two limit guide sleeves 8 and two limit guide posts 9, and one limit guide sleeve 8 and one limit guide post 9 arranged on both sides of the adjusting slider 3 cooperate with each other. In other embodiments, other numbers of limit guide sleeves 8 and limit guide posts 9 can be set according to the situation.

[0049] As Figure 5 and Figure 6 shown, during use, rotate the adjusting screw 7. Use the wrench 10 to rotate the adjusting screw 7 to make the distance between the top part 2 and the base 1 the smallest. Then put the meniscus spacer trial mold with adjustable thickness for the knee joint into the knee joint. Then rotate the adjusting screw 7, and the adjusting slider 3 drives the connecting rod 4 to rotate, making the distance between the top part 2 and the base 1 gradually increase. By performing knee joint flexion and extension movements and evaluating the surrounding soft tissues, confirm the distance between the top part 2 and the base 1. This distance is the appropriate trial mold thickness. Then, the adjusting screw 7 can be rotated again to make the distance between the top part 2 and the base 1 the smallest, and then the meniscus spacer trial mold with adjustable thickness for the knee joint can be taken out.

[0050] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the description and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. An adjustable-thickness knee joint spacer trial mold, characterized in that Comprising: A base (1) for contacting and cooperating with the tibial plateau; A top piece (2) located above the base (1), capable of moving up and down relative to the base (1), for contacting and cooperating with the femoral condyle; An adjusting slider (3) slidably arranged on the base (1); A connecting rod (4) whose two ends are respectively hinged to the adjusting slider (3) and the top piece (2).

2. The trial mold of the knee joint adjustable thickness spacer according to claim 1, characterized in that: The top piece (2) is provided with a lifting lug (21), the adjusting slider (3) and the lifting lug (21) are provided with hinge holes, and both ends of the connecting rod (4) are respectively provided with pin shafts, and the pin shafts are hinged to the hinge holes.

3. The trial mold for the knee joint adjustable thickness spacer according to claim 1, wherein: Further comprising: A first support frame (5) and a second support frame (6), the first support frame (5) and the second support frame (6) are spaced apart and arranged on the base (1); An adjusting screw rod (7) whose two ends are rotatably installed on the first support frame (5) and the second support frame (6), the adjusting screw rod (7) passes through the adjusting slider (3) and is threadedly connected to the adjusting slider (3).

4. The trial mold of the knee joint adjustable thickness spacer according to claim 3, characterized in that: The first support frame (5) is provided with a first through hole (51) and a first countersunk head groove (52), the first countersunk head groove (52) is located outside the first through hole (51), the adjusting screw rod (7) includes a nut (71) and a screw rod body (72), the screw rod body (72) passes through the first through hole (51), and the nut (71) is assembled in the first countersunk head groove (52).

5. The trial mold of the knee joint adjustable thickness spacer according to claim 4, characterized in that: The second support frame (6) is provided with a second through hole (61) and a second countersunk head groove (62), the second countersunk head groove (62) is located outside the second through hole (61), the adjusting screw rod (7) includes a stop block (73), the screw rod body (72) passes through the second through hole (61) and the second countersunk head groove (62), and the stop block (73) is threadedly connected to the screw rod body (72) and at least partially assembled in the second countersunk head groove (62).

6. The trial die for the knee joint adjustable thickness spacer according to claim 4, characterized in that: The end face of the nut (71) is provided with height scale lines (711) along the circumferential direction, the nut (71) is assembled and connected to the first support frame (5), and the first support frame (5) is provided with an indicating line (53).

7. The trial mold for the knee joint adjustable thickness spacer according to claim 4, characterized in that: An interface (712) is provided on the end face of the nut (71), the interface (712) is clamped with the joint of a wrench (10), and the wrench (10) rotates to drive the nut (71) to rotate.

8. The trial mold of the adjustable-thickness knee joint spacer according to claim 1, characterized in that, Further comprising a limit guide sleeve (8) and a limit guide post (9), one of the limit guide sleeve (8) and the limit guide post (9) is arranged on the base (1), and the other is arranged on the top piece (2), and the limit guide post (9) is inserted into the limit guide sleeve (8).

9. The trial mold for the knee joint adjustable thickness spacer according to claim 8, characterized in that, The limit guide sleeve (8) and the limit guide post (9) are respectively at least two.

10. The trial mold for the knee joint adjustable thickness spacer according to claim 9, characterized in that, At least one limit guide sleeve (8) and at least one limit guide post (9) are respectively arranged on both sides of the adjusting slider (3).

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