Total knee joint prosthesis tibia liner test mold structure

Abstract

The utility model discloses a total knee joint prosthesis tibia pad test mold structure which comprises a pad test mold piece and an insertion piece assembly, the pad test mold piece comprises a base and a base platform protruding out of the base, and a basic insertion groove is formed in the base platform; the insertion piece assembly comprises an insertion piece, the insertion piece comprises an insertion plate and wing plates arranged on the two sides of the insertion plate, the insertion piece assembly is matched with a basic insertion groove of the liner test mold piece based on the insertion plate, after the insertion piece assembly is matched with the liner test mold, the wing plates and the base table are stacked mutually to form the stacking thickness of the liner test mold structure, and the stacking thickness is adjusted based on the thickness of the wing plates; after the insertion piece assembly is matched with the liner test mold, the stacking thickness is matched with the target required thickness of the tibial plateau test piece, and the stacking thickness can be adjusted, so that the target required thickness of the tibial plateau test piece can be conveniently adapted according to the use requirement; the problem that a knee joint pad prosthesis with the proper thickness needs to be selected according to the flexion and extension gap, and accordingly a corresponding prosthesis is made for a pad with each thickness is solved, and cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tibial pad trial molds for total knee joint prosthesis, and in particular relates to a tibial pad trial mold structure for total knee joint prosthesis. Background Art

[0002] During the total knee replacement surgery, after completing the proximal femoral and tibial osteotomies, a trial mold of the liner prosthesis needs to be inserted to confirm the appropriate flexion and extension gap, so as to select a knee liner prosthesis of appropriate thickness. The common tibial liner prosthesis trial mold is designed to make a corresponding prosthesis for each thickness of the liner. The disadvantage is that the number of prostheses is large and the production cost is high. (For example, if there are 9 types of liner prostheses from small to large, and each type has 6 thicknesses, the number of prosthesis trial molds is 6×9, and each set of surgical instruments needs to be equipped with 54 liner trial molds.) Secondly, the excessive number of prostheses during the operation also brings certain troubles to the doctor's operation. Therefore, a tibial liner trial mold structure for a total knee prosthesis is proposed. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a tibial pad trial mold structure for a total knee prosthesis, which solves the problem in the prior art that a knee pad prosthesis of appropriate thickness needs to be selected according to the flexion and extension gap, resulting in a corresponding prosthesis for each thickness of pad being made, which is costly.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A total knee prosthesis tibial liner trial mold structure, comprising:

[0006] A gasket test mold, the gasket test mold comprising a base, a base protruding from the base, and a basic slot formed on the base;

[0007] An insert assembly, the insert assembly includes an insert, the insert includes an insert plate and wing plates arranged on both sides of the insert plate, the insert assembly is based on the insert plate and the basic slot of the liner trial mold is matched, after the insert assembly is matched with the liner trial mold, the wing plates and the base are stacked on each other to construct the stacking thickness of the liner trial mold structure, the stacking thickness is adjusted based on the thickness of the wing plates; after the insert assembly is matched with the liner trial mold, the stacking thickness matches the target required thickness of the tibial plateau trial.

[0008] Further, the base comprises a first base and a second base symmetrically arranged on the base, and the basic slot is arranged between the first base and the second base;

[0009] The wing plate includes a first wing plate and a second wing plate arranged on both sides of the plug plate. After the plug assembly is matched with the gasket test mold, the first wing plate and the first base are stacked on each other, and the second wing plate and the second base are stacked on each other.

[0010] In one feasible solution, the insert assembly includes one insert.

[0011] In another feasible scheme, the insert assembly includes a plurality of the inserts, the wing plates of the plurality of the inserts have different thicknesses, the plurality of the inserts correspond to different models, and the inserts of different models are matched with the gasket test mold to construct the stacking thickness of the gasket test mold.

[0012] In yet another feasible solution, the insert assembly comprises a plurality of the inserts, the wing panels of the plurality of the inserts have the same thickness, and the plurality of the inserts are stacked and plugged.

[0013] In yet another feasible solution, the insert assembly comprises a plurality of the inserts, the wing panels of the plurality of the inserts have different thicknesses, and the plurality of the inserts are stacked and plugged together.

[0014] In another feasible scheme, a plug-in slot is formed between the first wing plate and the second wing plate, plug-in grooves are formed on two opposite sides of the plug-in slot, and a plug-in protrusion is provided on the plug-in plate. Two adjacent plug-ins cooperate with each other through the plug-in grooves and the plug-in protrusions to realize stacked plug-in between the plug-ins.

[0015] Furthermore, a ball head spring plunger connecting hole is provided on the insert assembly, and the ball head spring plunger connecting hole is used for pre-installing the ball head spring plunger. A ball head spring plunger positioning hole is also provided on the gasket test mold. When the insert assembly and the gasket test mold are matched to the target position, the ball head of the ball head spring plunger cooperates with the ball head spring plunger positioning hole.

[0016] In an implementable solution, the first base has a first stopper protruding toward the second base, and the second base has a second stopper protruding toward the first base, and the first stopper and the second stopper are used to limit the plug-in position of the plug board.

[0017] In another feasible solution, a first wedge-shaped groove is provided on the first base, and a second wedge-shaped groove is provided on the second base, the first wedge-shaped groove and the second wedge-shaped groove are symmetrically arranged, and the first wedge-shaped groove and the second wedge-shaped groove are configured to form the basic slot.

[0018] Furthermore, the liner test mold is provided with a plurality of first weight-reducing grooves, and the insert is provided with a plurality of second weight-reducing grooves.

[0019] The utility model discloses a tibial pad trial mold structure of a total knee prosthesis, comprising a pad trial mold piece and an insert assembly, wherein the pad trial mold piece comprises a base, a base protruding from the base, and a basic slot is formed on the base; the insert assembly comprises an insert, and the insert comprises an insert plate and wing plates arranged on both sides of the insert plate, and the insert assembly matches the basic slot of the pad trial mold piece based on the insert plate, and after the insert assembly matches the pad trial mold, the wing plates and the base are stacked on each other to construct a stacking thickness of the pad trial mold structure, and the stacking thickness is adjusted based on the thickness of the wing plates; after the insert assembly matches the pad trial mold, the stacking thickness matches the target required thickness of the tibial plateau trial piece. The present application can adjust the stacking thickness, so as to facilitate the target required thickness of the tibial plateau test piece to be adapted according to the use requirements, solve the problem in the prior art that a corresponding prosthesis is made for each thickness of the pad, which requires the selection of a knee pad prosthesis of appropriate thickness according to the flexion-extension gap, reduces the high production cost caused by the excessive number of prostheses produced, and reduces the trouble caused to the doctor by the excessive number of prostheses during the operation, thereby making the total knee prosthesis tibial pad test mold more convenient to use. In addition, the present application adopts a plug-in connection method between the insert assembly and the pad test mold, which has a longer service life, more accurate positioning, and more convenient installation compared to the gasket fixed by the guide column in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0021] Figure 1 It is a schematic diagram of the overall structure of the tibial liner trial mold structure of the total knee prosthesis according to an embodiment of the utility model;

[0022] Figure 2 It is an exploded view of the tibial liner trial mold structure of the total knee prosthesis according to the embodiment of the utility model;

[0023] Figure 3 It is a plan view of a tibial liner trial mold structure of a total knee prosthesis according to an embodiment of the utility model;

[0024] Figure 4 It is a cross-sectional view of a trial mold structure of a tibial liner of a total knee prosthesis according to an embodiment of the utility model;

[0025] In the figure, 1-gasket test mold, 11-base, 12-base slot, 13-ball head spring plunger positioning hole, 14-first stop platform, 15-second stop platform, 2-insert sheet, 21-insert plate, 22-wing plate, 23-plug slot, 24-ball head spring plunger connecting hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In order to solve the problems existing in the prior art, the present application provides a tibial liner test mold structure for a total knee prosthesis, specifically, Figures 1 to 4As shown, the tibial pad trial structure of the total joint prosthesis includes a pad trial mold 1 and an insert assembly, and the pad trial mold 1 includes a base, a base 11 protruding from the base, and a basic slot 12 is formed on the base 11. The insert assembly is plugged into the basic slot 12 to achieve the plug-in installation of the insert assembly and the pad trial mold 1. It can be understood that the insertion between the insert assembly and the pad trial mold 1 is convenient for installation and disassembly, simplifies the installation operation, and improves the installation efficiency. Further, the insert assembly includes an insert 2, and the insert 2 includes an insert plate 21 and a wing plate 22 set on both sides of the insert plate 21. The insert assembly is matched with the basic slot 12 of the pad trial mold 1 based on the insert plate 21. After the insert assembly is matched with the pad trial mold, the wing plate 22 and the base 11 are stacked with each other to form a stacking thickness of the pad trial mold structure, and the stacking thickness is adjusted based on the thickness of the wing plate 22; after the insert assembly is matched with the pad trial mold, the stacking thickness matches the target required thickness of the tibial plateau trial. It is understandable that during the total knee replacement surgery, after completing the proximal osteotomy of the femur and tibia, a trial mold of the cushion prosthesis needs to be inserted to confirm the appropriate flexion and extension gap, so as to select a knee joint cushion prosthesis of the target required thickness. In this embodiment, the stacking degree of the cushion trial mold structure can be adjusted based on the thickness of the wing plate 22, that is, the wing plate 22 can be designed to have different thicknesses, so that when the wing plates 22 of different thicknesses are stacked with the base 11, cushion trial mold structures with different stacking thicknesses are obtained based on the wing plates 22 of different thicknesses. Therefore, the present application can adjust the thickness of the pad test mold structure based on the thickness adjustment of the insert assembly, so as to adjust the thickness of the tibial pad test mold of the total knee prosthesis according to the use requirements, solve the problem in the prior art that a knee pad prosthesis of appropriate thickness needs to be selected according to the flexion-extension gap, resulting in a corresponding prosthesis for each thickness of pad, reduce the situation of high production costs caused by too many prostheses produced, and reduce the situation of too many prostheses causing trouble to doctors during surgery, thereby making the tibial pad test mold of the total knee prosthesis more convenient to use. Specifically, the base 11 includes a first base and a second base symmetrically arranged on the base, and the basic slot 12 is arranged between the first base and the second base; the wing plate 22 includes a first wing plate and a second wing plate arranged on both sides of the insert plate 21. After the insert assembly is matched with the pad test mold, the first wing plate and the first base are stacked on each other, and the second wing plate and the second base are stacked on each other.

[0028] In an operative solution, the insert assembly includes an insert 2 .

[0029] In another feasible solution, the insert assembly includes a plurality of inserts 2. In one example, the thickness of the wing plates 22 of the plurality of inserts 2 is different, so that the plurality of inserts 2 correspond to different models. When inserts 2 of different models are matched with the gasket test mold 1, the plurality of inserts 2 of different models and the gasket test mold 1 respectively form gasket test molds 1 of different stacking degrees. Specifically, the thickness of the plurality of inserts 2 can be set in sequence based on the basic base number. For example, when the thickness of the base 11 is confirmed, the thickness of the wing plates 22 of the plurality of inserts 2 can be 2 mm, 4 mm, 6 mm, 8 mm, etc., which can be obtained by increasing the basic base number of 2 mm. Thus, the stacking thickness of the gasket test mold structure can be as shown in Table 1:

[0030] Table 1

[0031]

[0032] It can be seen that when the inserts 2 of the wing plates 22 of multiple different thicknesses are matched with the gasket test mold 1, the requirements of multiple stacking thicknesses can be met, thereby improving the scalability of the thickness of the gasket test mold structure. It is understandable that the basic base number can also be 3mm, 4mm, etc., or can be increased in multiples, etc. Specifically, it can be set based on actual needs and is not specifically limited here.

[0033] In another feasible solution, the insert assembly includes a plurality of inserts 2, the wing plates 22 of the plurality of inserts 2 have different thicknesses, and the plurality of inserts 2 are stacked and inserted. In one example, when the thickness of the base 11 is 5 mm, and the plurality of wing plates 22 with different thicknesses are 2 mm, 3 mm, and 4 mm, respectively, the stacking thickness that can be achieved by the liner trial mold structure can be as shown in Table 2 below:

[0034] Table 2

[0035]

[0036] It is understandable that inserts 2 with different wing plate 22 thicknesses can be selected to meet the requirements of the liner test mold structure for different stacking thicknesses, thereby improving the scalability of the thickness of the liner test mold structure.

[0037] In another feasible solution, the insert assembly includes a plurality of inserts 2, the wing plates 22 of the plurality of inserts 2 have the same thickness, and the plurality of inserts 2 are stacked and plugged. It can be understood that the wing plates 22 of the plurality of inserts 2 have the same thickness, which facilitates the control of the stacking thickness of the liner test mold structure while achieving the scalability of the thickness of the liner test mold structure.

[0038] In another feasible solution, a plug-in slot 23 is formed between the first wing plate and the second wing plate, plug-in grooves are formed on two opposite sides of the plug-in slot 23, plug-in protrusions are provided on the plug-in plate 21, and two adjacent plug-ins 2 cooperate with each other through the plug-in grooves and the plug-in protrusions to realize the stacked plug-in between the plug-ins 2. The first base has a first stopper 14 protruding in the direction close to the second base, and the second base has a second stopper 15 protruding in the direction close to the first base. The first stopper 14 and the second stopper 15 are used to limit the plug-in position of the plug-in plate 21. Furthermore, a ball head spring plunger connection hole 24 is also provided on the plug-in plate assembly, and the ball head spring plunger connection hole 24 is used to pre-install the ball head spring plunger. A ball head spring plunger positioning hole 13 is also provided on the gasket test mold 1. When the plug-in plate assembly and the gasket test mold 1 are matched to the target position, the ball head of the ball head spring plunger cooperates with the ball head spring plunger positioning hole 13. It is understandable that the insert 2 can be blocked by setting the first stopper 14 and the second stopper 15 to achieve accurate matching of the insert assembly and the gasket test mold 1 at the target position, thereby achieving accurate ejection of the ball head spring plunger. In this application, the insert assembly and the gasket test mold adopt an insert-type connection method. Compared with the gasket fixed by the guide column in the prior art, there is no need for repeated plugging and unplugging, which increases the service life of the insert assembly. In addition, this application realizes position positioning through the stopper, which makes positioning more accurate and installation more convenient.

[0039] In another feasible solution, a first wedge-shaped groove is provided on the first base, and a second wedge-shaped groove is provided on the second base. The first wedge-shaped groove and the second wedge-shaped groove are symmetrically arranged, and the first wedge-shaped groove and the second wedge-shaped groove are configured to form a basic slot 12 .

[0040] Furthermore, the liner test mold 1 is provided with a plurality of first weight-reducing grooves, and the insert 2 is provided with a plurality of second weight-reducing grooves.

[0041] The utility model discloses a tibial pad trial mold structure of a total knee prosthesis, comprising a pad trial mold piece 1 and an insert assembly, wherein the pad trial mold piece 1 comprises a base, a first base and a second base protruding from the base, the first base and the second base are symmetrically arranged, and a basic slot 12 is formed between the first base and the second base; the insert assembly comprises an insert 2, the insert 2 comprises an insert plate 21 and wing plates 22 arranged on both sides of the insert plate 21, the wing plates 22 comprise a first wing plate and a second wing plate, the insert assembly matches with the basic slot 12 of the pad trial mold piece 1 based on the insert plate 21, after the insert assembly matches with the pad trial mold, the first wing plate and the first base are stacked with each other to form a first thickness of the pad trial mold structure, the second wing plate and the second base are stacked with each other to form a second thickness of the pad trial mold structure, and the second thickness is the same as the first thickness; after the insert assembly matches with the pad trial mold, the stacking thickness of the pad trial mold piece 1 matches with the target required thickness of the tibial plateau trial piece, wherein the stacking thickness is the first thickness or the second thickness. The present application can adjust the thickness of the pad trial mold structure based on the thickness adjustment of the insert assembly, which is convenient for adjusting the thickness of the tibial pad trial mold of the total knee prosthesis according to the use requirements, and solves the problem in the prior art that a knee pad prosthesis with a suitable thickness needs to be selected according to the flexion and extension gap, resulting in a corresponding prosthesis for each pad thickness. It reduces the high production cost caused by the production of too many prostheses, and reduces the trouble caused to the doctor's operation by too many prostheses during the operation, thereby making the tibial pad trial mold of the total knee prosthesis more convenient to use.

[0042] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A tibial liner trial mold structure for a total knee prosthesis, characterized in that: include: A gasket test mold (1), the gasket test mold (1) comprising a base, a base (11) protruding from the base, and a basic slot (12) formed on the base (11); An insert assembly, the insert assembly comprising an insert (2), the insert (2) comprising an insert plate (21) and wing plates (22) arranged on both sides of the insert plate (21), the insert assembly matching the insert plate (21) with the base slot (12) of the liner test mold (1), after the insert assembly matches the liner test mold, the wing plates (22) and the base (11) are stacked with each other to construct a stacking thickness of the liner test mold structure, the stacking thickness is adjusted based on the thickness of the wing plates (22); after the insert assembly matches the liner test mold, the stacking thickness matches the target required thickness of the tibial plateau test mold.

2. The tibial liner trial mold structure of the total knee prosthesis according to claim 1, characterized in that: The base (11) comprises a first base and a second base symmetrically arranged on the base, and the basic slot (12) is arranged between the first base and the second base; The wing plate (22) comprises a first wing plate and a second wing plate arranged on both sides of the plug plate (21); after the plug plate assembly is matched with the gasket test mold, the first wing plate and the first base are stacked together, and the second wing plate and the second base are stacked together.

3. The tibial liner trial mold structure of the total knee prosthesis according to claim 1, characterized in that: The insert piece assembly comprises an insert piece (2).

4. The tibial liner trial mold structure of the total knee prosthesis according to claim 1, characterized in that: The insert assembly comprises a plurality of inserts (2), the wing plates (22) of the plurality of inserts (2) having different thicknesses, the plurality of inserts (2) corresponding to different models, and the inserts (2) of different models are matched with the gasket test mold (1) in a single manner to construct the stacking thickness of the gasket test mold (1).

5. The tibial liner trial mold structure of the total knee prosthesis according to claim 2, characterized in that: The insert sheet assembly comprises a plurality of insert sheets (2), the wing panels (22) of the plurality of insert sheets (2) have the same thickness, and the plurality of insert sheets (2) are stacked and plugged.

6. The tibial liner trial mold structure of the total knee prosthesis according to claim 2, characterized in that: The insert sheet assembly comprises a plurality of insert sheets (2), the wing panels (22) of the plurality of insert sheets (2) have different thicknesses, and the plurality of insert sheets (2) are stacked and plugged.

7. The tibial liner trial mold structure of the total knee prosthesis according to claim 5 or 6, characterized in that: A plug-in slot (23) is formed between the first wing plate and the second wing plate, plug-in slide grooves are formed on two opposite sides of the plug-in slot (23), and a plug-in protrusion is provided on the plug-in plate (21). Two adjacent plug-ins (2) cooperate with each other through the plug-in slide grooves and the plug-in protrusions to achieve stacked plug-in between the plug-ins (2).

8. The tibial liner trial mold structure of the total knee prosthesis according to claim 1, characterized in that: The insert assembly is also provided with a ball head spring plunger connection hole (24), and the ball head spring plunger connection hole (24) is used to pre-install the ball head spring plunger. The gasket test mold (1) is also provided with a ball head spring plunger positioning hole (13). When the insert assembly and the gasket test mold (1) are matched to the target position, the ball head of the ball head spring plunger cooperates with the ball head spring plunger positioning hole (13).

9. The tibial liner trial mold structure of the total knee prosthesis according to claim 2, characterized in that: The first base has a first stop platform (14) protruding in a direction close to the second base, and the second base has a second stop platform (15) protruding in a direction close to the first base. The first stop platform (14) and the second stop platform (15) are used to limit the plugging position of the plug board (21).

10. The tibial liner trial mold structure of the total knee prosthesis according to claim 2, characterized in that: The first base is provided with a first wedge-shaped groove, and the second base is provided with a second wedge-shaped groove. The first wedge-shaped groove and the second wedge-shaped groove are symmetrically arranged, and the first wedge-shaped groove and the second wedge-shaped groove constitute the basic slot (12).

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