Multifunctional tibia pad test mold holder

Abstract

The utility model discloses a multifunctional tibia pad test mold holder, and belongs to the technical field of medical instruments. The defect that in the prior art, during traditional total knee joint replacement, a tibia liner prosthesis test mold is high in cost is overcome. A main body structure of the device comprises a main body handle, a sliding block, a connecting column, a connecting piece, a thickness adjusting knob, a base test mold and a liner test mold, the sliding block is installed on the main body handle in a sliding mode, and the thickness adjusting knob penetrates through the main body handle and then is connected with the bottom of the sliding block; the lower end of the connecting column is installed in an installation hole in the sliding block, and the upper end of the connecting column penetrates through the conversion knob and then is connected with the connecting piece. The base test mold is installed at the end of the main body handle, the liner test mold is connected with the connecting piece, and the height H between the liner test mold and the base test mold is the thickness of the tibia liner test mold. The total knee joint replacement device is mainly used for total knee joint replacement.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and more specifically, it relates to a multifunctional tibial liner mold holder. Background Technology

[0002] Total knee arthroplasty is an effective treatment for end-stage knee osteoarthritis, aiming to increase stability, range of motion, improve function, and reduce pain. Before implanting a tibial liner prosthesis, a trial fitting using tibial liner molds is necessary to determine if the selected tibial liner prosthesis model is suitable. Because tibial liner prostheses come in different thicknesses, making trial molds of the same quantity and specifications as the prosthesis would result in higher costs.

[0003] Measuring osteotomy and gap balancing are different surgical methods used by doctors in total knee replacement. The two methods differ significantly in surgical steps and requirements for surgical instruments. Measuring osteotomy has relatively fixed and simple surgical steps, but it pays less attention to the patient's soft tissue balance; gap balancing has relatively complex surgical steps, but it better takes into account the patient's soft tissue balance.

[0004] Existing tibial liner trial mold holders have several limitations: 1. They lack fine adjustment capabilities, making it impossible to precisely adjust the height of the liner trial mold, which can lead to inaccurate selection of the liner size; 2. The existing structural design is complex and inconvenient to operate, increasing surgical time and difficulty; 3. Traditional tools may not have intuitive thickness or angle indication functions, making it difficult for doctors to quickly confirm whether the settings are correct.

[0005] For example, Chinese invention patent application publication number CN 112618115 A discloses a tibial plateau support holder. After the support body is fixed by a striking head and a locking device, the handle is subjected to force by hammering, and the force is transmitted to the support body through the connecting block and the striking head. Since the striking head and the locking device apply opposite forces to the inner edge of the support body, it is difficult for gaps to be formed between the support body and the fitting surface, and it is also difficult for gaps to be formed between the support body and the snap-fit ​​surface. This makes it more difficult for the direction of the force ultimately transmitted to the top surface of the support body to change, reducing the possibility of surgical failure due to changes in the force direction of the support body. However, its shortcomings are that it cannot assess whether the thickness of the padding mold of different thicknesses is appropriate, nor can it reflect whether the soft tissue is balanced. Therefore, the doctor cannot assess whether the force on the inner and outer sides of the soft tissue is balanced, which leads to a prolongation of the operation time. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a multifunctional tibial pad mold holder.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A multifunctional tibial liner mold holder includes a main handle, a slider, a connecting post, a connector, a thickness adjustment knob, a base mold, and a liner mold. The slider is slidably mounted on the main handle, and the thickness adjustment knob is threaded to the main handle and then inserted upwards into a hole at the bottom of the slider. The lower end of the connecting post is installed in a mounting hole on the slider, and the upper end of the connecting post passes through the adjustment knob and is connected to the connector. The base mold is mounted on the end of the main handle, and the liner mold is connected to the connector. The height H between the liner mold and the base mold is the thickness of the tibial liner mold.

[0009] Preferably, the connector is provided with a connecting plate, and the liner mold is provided with a connecting groove that mates with the connecting plate. The connector is connected to the liner mold through the connecting plate and the connecting groove.

[0010] Preferably, the end of the main handle is provided with a pawl, and the base mold is installed on the main handle by a plunger and the pawl.

[0011] Preferably, the upper end of the connecting column is connected to the connecting piece via a limiting pin.

[0012] Preferably, the main handle is provided with a groove, and the slider is slidably mounted on the groove.

[0013] Preferably, the side of the main handle is provided with a thickness scale line, and the side of the slider is provided with a pointer that works in conjunction with the thickness scale line.

[0014] Preferably, the connector is provided with angle markings, and the connecting post is provided with indicator lines that cooperate with the angle markings.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model can change the distance between the liner mold and the base mold by adjusting the thickness adjustment knob, thereby simulating liner molds of different thicknesses. It can evaluate whether the extension / flexion gap is appropriate during surgery. Only one liner mold is needed for each model, which can greatly reduce the number of liner molds, save instrument costs, and simplify the operation steps when adjusting the thickness of the same model of liner.

[0017] 2. The function can be switched during surgery by adjusting the conversion knob. When the conversion knob is turned to the dotted line position (i.e., the lower end face of the connector is pressed against the bottom), the connector position is locked, and the liner mold will not tilt due to uneven force on the inner and outer sides. At this time, only the appropriate thickness of the liner mold of different thicknesses can be evaluated. When the conversion knob is turned to the solid line position (i.e., the lower end face of the conversion knob is close to the slider), the liner mold will tilt according to the force on the inner and outer soft tissues. The indicator line on the connecting post and the angle scale on the connector will reflect the balance of the soft tissues in real time. The doctor can evaluate whether the force on the inner and outer sides is balanced. At this time, the doctor can release the soft tissues on both sides of the patient appropriately according to the real-time display, thereby achieving the balance of the inner and outer soft tissues. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view of the present invention;

[0020] Figure 3 This is the front view of the present invention;

[0021] Figure 4 This is the left view of the present invention;

[0022] Figure 5 for Figure 4 Sectional view of AA.

[0023] In the diagram: 1. Main handle; 2. Slider; 3. Limit screw; 4. Limit pin; 5. Connecting post; 6. Conversion knob; 7. Connector; 8. Thickness adjustment knob; 9. Piston; 10. Base mold; 11. Gasket mold; 101. Groove; 102. Claw; 103. Thickness scale line; 201. Mounting hole; 202. Pointer; 501. Indicator line; 701. Connecting plate; 702. Angle scale line; 801. Limit groove; 1101. Connecting groove. Detailed Implementation

[0024] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0025] Example 1:

[0026] like Figure 1-4As shown, a multifunctional tibial liner test mold holder includes a main handle 1, a slider 2, a connecting post 5, a connector 7, a thickness adjustment knob 8, a base mold 10, and a liner mold 11. The slider 2 is slidably mounted on the main handle 1, and the thickness adjustment knob 8 is threaded to the main handle 1 and then inserted upwards into a hole at the bottom of the slider 2. The lower end of the connecting post 5 is installed in a mounting hole 201 on the slider 2, and the upper end of the connecting post 5 passes through a conversion knob 6 and is connected to the connector 7. The base mold 10 is mounted on the end of the main handle 1, and the liner mold 11 is connected to the connector 7. The height H between the liner mold 11 and the base mold 10 is the thickness of the tibial liner mold. Specifically, the end of the main handle 1 is provided with a claw 102, and the base mold 10 is mounted on the main handle 1 via a plunger 9 and the claw 102. The main handle 1 is provided with a groove 101, and the slider 2 is slidably mounted on the groove 101. The upper end of the connecting post 5 is connected to the connecting piece 7 via the limiting pin 4, and the conversion knob 6 is threadedly connected to the connecting post 5.

[0027] Specifically, after the thickness adjustment knob 8 is connected to the main handle 1 through a threaded connection, it passes through the light hole of the slider 2. After the limiting screw 3 is fixed with the corresponding threaded hole of the slider 2, its front end cooperates with the limiting groove 801 on the thickness adjustment knob 8, thereby realizing the relative fixation of the slider 2 and the thickness adjustment knob 8. The side of the slider 2 is provided with a limiting screw 3. The function of the limiting screw 3 is to fix the slider 2 and the thickness adjustment knob 8 relative to each other. When the thickness adjustment knob 8 is rotated, the slider 2 can move up and down.

[0028] In this embodiment, the required type of liner mold 11 is installed onto the connector 7, and the claw 102 and plunger 9 on the main handle 1 can be reliably fixed with the corresponding structure on the base mold 10. The height H formed by the liner mold 11 and the base mold 10 is the thickness of the tibial liner mold. Figure 5 As shown, H can be freely adjusted by rotating the thickness adjustment knob 8, and the thickness scale line 103 pointed to by the pointer 202 is the current thickness value of H.

[0029] Example 2:

[0030] A multifunctional tibial liner test mold holder differs from Embodiment 1 in that the connector 7 is provided with a connecting plate 701, and the liner test mold 11 is provided with a connecting groove 1101 that cooperates with the connecting plate 701. The connector 7 is connected to the liner test mold 11 through the connecting plate 701 and the connecting groove 1101.

[0031] Furthermore, the side of the main handle 1 is provided with a thickness scale line 103, and the side of the slider 2 is provided with a pointer 202 that works in conjunction with the thickness scale line 103. The connector 7 is provided with an angle scale line 702, and the connecting post 5 is provided with an indicator line 501 that works in conjunction with the angle scale line 702.

[0032] When it is necessary to adjust the thickness of the tibial pad mold, rotate the thickness adjustment knob 8 to move the slider 2 upward. The slider 2, through the connector 7, moves the pad mold 11 upward. The position of the thickness scale line 103 pointed to by the pointer 202 on the slider 2 is the current thickness value of H. That is, by rotating the thickness adjustment knob 8, H can be freely adjusted between 9 and 23 mm.

[0033] like Figure 3 As shown, if the conversion knob 6 is turned to the dotted line position (i.e., the lower end face of the connector 7 is pressed against the bottom), the connector 7 is locked, and the padding mold 11 will not tilt due to uneven force on the inner and outer sides. At this time, it is only possible to assess whether the thickness of the padding mold 11 of different thicknesses is appropriate. If the conversion knob 6 is turned to the solid line position (i.e., the lower end face of the conversion knob 6 is close to the slider 2), the connector 7 is not locked, and the padding mold 11 will tilt due to uneven force on the inner and outer sides. The indicator line 501 on the connecting post 5 and the angle scale line 702 on the connector 7 reflect the balance of the soft tissue in real time. The doctor can release the soft tissue on both sides of the patient appropriately according to the real-time display, thereby achieving the balance of the inner and outer soft tissue.

Claims

1. A multi-functional tibial spacer template holder characterized by: The utility model relates to a tibial pad test mould, including main body handle (1), slider (2), connecting column (5), connecting piece (7), thickness adjusting knob (8), base test mould (10) and gasket test mould (11), slider (2) slidingly installs on main body handle (1), and thickness adjusting knob (8) is connected with main body handle (1) after screw thread and goes into the hole in the bottom of slider (2) upward, the lower end of connecting column (5) is installed in the mounting hole (201) on slider (2), and the upper end of connecting column (5) is connected with connecting piece (7) after penetrating conversion knob (6), base test mould (10) is installed in the end of main body handle (1), gasket test mould (11) is connected with connecting piece (7), and the height H between gasket test mould (11) and base test mould (10) is tibial pad test mould thickness.

2. The multi-functional tibial shim block holder of claim 1, wherein: Connecting piece (7) is provided with connecting plate (701), and gasket test mould (11) is provided with connecting groove (1101) matched with connecting plate (701), and connecting piece (7) is connected with gasket test mould (11) through connecting plate (701) and connecting groove (1101).

3. The multi-functional tibial shim block holder of claim 2, wherein: The end of main body handle (1) is provided with claw (102), and base test mould (10) is installed on main body handle (1) through plunger (9) and claw (102).

4. The multi-functional tibial shim block holder of claim 1, wherein: The upper end of connecting column (5) is connected with connecting piece (7) through limiting pin (4).

5. The multi-functional tibial shim block holder of claim 4, wherein: Main body handle (1) is provided with recess (101), and slider (2) is slidably installed on recess (101).

6. The multi-functional tibial spacer template holder of any of claims 1-5, wherein: The side of main body handle (1) is provided with thickness scale line (103), and the side of slider (2) is provided with pointer (202) matched with thickness scale line (103).

7. The multi-functional tibial shim block holder of claim 6, wherein: Connecting piece (7) is provided with angle scale line (702), and connecting column (5) is provided with indicating line (501) matched with angle scale line (702).

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