Tibia osteotomy guider fixed on unicondylar femur test mold

Abstract

The utility model discloses a tibia osteotomy guider fixed on a unicondylar femur test mold. The tibia osteotomy guider comprises a fixer and an imprinting device, the fixer comprises a fixed switch and two fixed support arms, fixed feet are arranged at the two ends of each fixed support arm, the centers of the two fixed support arms are crossed and hinged, and the fixed switch is arranged at the hinged part; the curvature of the imprint device is a strip plate consistent with that of the thighbone test mold, the length direction of the imprint device is set as the length direction, two connecting blocks are connected in the sliding groove in a sliding mode, and the two connecting blocks are connected with the ends of the same sides of the two fixed supporting arms respectively; a plurality of imprinting teeth are arranged in the length direction of the imprinting device and located on the convex face of the imprinting device. The optimal longitudinal osteotomy position of the tibia can be accurately indicated, and the influence of subjective factors is reduced.

Description

Technical Field

[0001] The invention belongs to the field of medical instruments and relates to a tibial osteotomy guide fixed on a unicondylar femoral trial mold. Background Art

[0002] Knee osteoarthritis is a common degenerative disease in the elderly, with a high incidence and disability rate, and imposes a huge burden on society and patients. The tibiofemoral surface of the knee joint is divided into two joint compartments, the inner and outer compartments. Unicompartmental knee replacement is a precise replacement for unicompartmental knee osteoarthritis. It has significant advantages, such as small surgical incision, high bone preservation, short hospital stay, early bed rest, significant improvement in knee joint function and pain after surgery.

[0003] Unicompartmental knee replacement gaskets can be divided into fixed platform and mobile platform. Compared with the fixed platform procedure, mobile platform replacement requires more subjective factors from the surgeon. The purpose of this patent is to reduce this subjective influence and provide objective basis for the surgeon to perform osteotomy during the operation. The mobile platform gasket is driven by the femoral prosthesis and moves on the tibial prosthesis platform. The movement of the knee joint is very complex. The movement trajectory of the mobile platform gasket on the tibial prosthesis platform is not a simple forward and backward movement, but is accompanied by different degrees of left and right movement. Therefore, the position of the tibial prosthesis relative to the femoral prosthesis in the sagittal plane is very important. In other words, the most important thing about tibial osteotomy is the longitudinal osteotomy position, which determines the position of the side wall of the tibial prosthesis relative to the mobile platform gasket and determines whether the side wall of the tibial prosthesis will collide with the mobile platform gasket. If the mobile platform and the tibial prosthesis do not match, the mobile platform gasket will hit the side wall of the tibial prosthesis under the drive of the femoral prosthesis, resulting in consequences such as the gasket hitting the prosthesis or even the gasket dislocation.

[0004] In traditional surgery, tibial osteotomy takes precedence over femoral osteotomy. However, tibial osteotomy is affected by the surgeon's subjective consciousness and lacks objective basis, making it impossible to accurately determine the longitudinal osteotomy position of the tibia. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a tibial osteotomy guide fixed to a unicompartmental femoral trial mold, which can accurately indicate the optimal longitudinal osteotomy position of the tibia and reduce the influence of subjective factors.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A tibial osteotomy guide fixed to a unicompartmental femoral trial mold comprises a fixator and an imprinter;

[0008] The fixer includes a fixing switch and two fixing arms, both ends of the two fixing arms are provided with fixing feet, the two fixing arms are cross-hinged at the center, and a fixing switch is provided at the hinge;

[0009] The curvature of the imprinter is a long strip consistent with the femoral trial mold, and the extension direction of the imprinter is provided with an extension direction. Two connecting blocks are slidably connected in the slide groove, and the two connecting blocks are respectively connected to the ends of the same side of the two fixed arms;

[0010] A plurality of imprinting teeth are arranged in the extension direction of the imprinter, and the imprinting teeth are located on the convex surface of the imprinter.

[0011] Preferably, the two fixed arms are hinged by bolts, the fixed switch is fixed by nuts, the nuts are connected to the bolts, and the two fixed arms are located between the nuts and the bolts.

[0012] Furthermore, a rotating handle is provided on the nut.

[0013] Preferably, the fixing feet are made of hard material.

[0014] Preferably, the outside of the fixed foot is wrapped with a rubber pad.

[0015] Preferably, the fixed foot is hinged to the fixed support arm, and a torsion spring is connected between the fixed foot and the fixed support arm.

[0016] Preferably, the fixing foot adopts a connecting bolt, and four threaded holes are set at corresponding positions on the femoral trial mold according to the position of the end of the fixed support arm, and the two threaded holes on the right side are in contact with the outer side of the femoral trial mold.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention uses the present invention to clarify the activity trajectory of the femoral trial mold on the tibial platform, and then performs tibial osteotomy based on the trajectory, thereby providing the surgeon with the activity trajectory of the femoral prosthesis on the tibial platform. The surgeon performs tibial osteotomy based on this trajectory, which can greatly avoid the collision between the activity platform gasket and the tibial prosthesis, so that the postoperative prosthesis can better meet the individual conditions of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the tibial osteotomy guide of the present invention;

[0020] Figure 2 This is a diagram of the tibial osteotomy guide of the present invention in use.

[0021] Among them: 1-fixer; 2-imprinter; 3-fixed switch; 4-fixed support arm; 5-fixed foot; 6-slide groove; 7-imprinting teeth. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" used in this article includes any and all combinations of one or more related listed items. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0027] like Figure 1 As shown, the tibial osteotomy guide fixed to the unicompartmental femoral trial mold according to the present invention comprises a fixator 1 and an imprinter 2.

[0028] The fixer 1 includes a fixed switch 3 and two fixed arms 4. The fixed arms 4 are single-curvature thin steel plates with a columnar fixed foot 5 at each end. A hole is set at the center of the steel plate. The two fixed arms 4 are cross-set at the center. A short bolt passes through the hole to connect the two fixed arms 4.

[0029] The fixing switch 3 is a nut with a rotating handle, the nut is connected to the bolt, the nut and the bolt clamp the two fixing arms 4 in the middle, and the two fixing arms 4 are controlled to move or fix by rotating the nut. When the nut is loosened, the two fixing arms 4 rotate around the bolt like scissors, so as to adapt to different models of femoral trial molds.

[0030] In this embodiment, the fixing foot 5 is made of hard material, and the outside of the fixing foot 5 is wrapped with a rubber pad. During the clamping process, the rubber pad can increase the friction force, and the rubber pad can be deformed to make the clamping more secure.

[0031] The imprinter 2 is a single-curvature steel plate with a slide groove 6 in the middle extension direction. Two connecting blocks are slidably connected in the slide groove 6. The two connecting blocks are respectively connected to the ends of the same side of the two fixed arms 4. The imprinter 2 is relatively fixed to the fixture 1 through the connecting blocks, so that the imprinter 2 is not affected by the opening and closing size of the fixture 1.

[0032] A plurality of imprinting teeth 7 are provided in the extension direction of the imprinter 2 , and the imprinting teeth 7 are located on the convex surface of the imprinter 2 .

[0033] The curvature of the imprinter 2 is consistent with that of the femoral trial mold, ensuring the restoration of the activity trajectory of the femoral trial mold on the tibial cartilage platform. When the fixator 1 is adapted to the width of femoral trial molds of different models, the slide groove 6 of the imprinter 2 is used to ensure that as the fixator 1 adjusts the adaptation size, the connecting block slides in the slide groove 6 of the imprinter 2 to ensure that the imprinter 2 is always on the side of the two fixed arms 4, ensuring that the tooth marks are always on the outside of the femoral trial mold, providing the activity trajectory of the outer edge of the movable platform gasket. There are protruding tooth marks on the surface of the imprinter 2, which are used to leave traces on the tibial cartilage platform. When the fixator 1 is fixed on the femoral trial mold, the patient's knee joint is moved to the maximum extent during the operation, so that the imprinter 2 will imprint the activity trajectory of the femoral trial mold on the cartilage surface of the patient's tibial plateau, providing the surgeon with a basis for longitudinal tibial osteotomy.

[0034] like Figure 2 As shown, the fixator 1 is installed at the bottom of the femoral trial mold, the ends of the two fixed arms 4 are located at the front and rear walls of the femoral trial mold, the imprinter 2 is located on the outside of the femoral trial mold, and the fixed legs are attached to the front and rear walls of the femoral trial mold. The front and rear walls of the femoral trial mold have certain edges and corners, which are relatively easier to fix. The center of the fixed arms 4 is located at the center of the bottom of the femoral trial mold. The two fixed arms 4 are opened to both sides with force so that the fixed legs squeeze the front and rear walls of the femoral trial mold, similar to applying prestress, and then the fixator 1 is fixed to the femoral trial mold by rotating the fixing switch 3, so that the two fixed arms 4 are firmly fixed to the femoral trial mold to reduce the probability of falling off.

[0035] The method for using the tibial osteotomy guide includes the following steps:

[0036] S1, patients undergoing unicompartmental hip replacement surgery, with femur osteotomized and tibia untreated, select a suitable femoral trial mold.

[0037] S2, such as Figure 2 As shown, the femoral trial mold is installed on the femoral condyle that has undergone osteotomy, the fixing switch 3 is loosened, the fixing foot 5 is tightly fitted to the front and rear walls of the femoral trial mold, the imprinter 2 is flush with the outer side of the femoral trial mold, the center of the fixing arm 4 is located at the center of the bottom of the femoral trial mold, and the fixing switch 3 is tightened.

[0038] S3, move the patient's knee joint so that the teeth marks of the imprinter 2 leave a trace on the tibial plateau cartilage surface, which is the movement trajectory of the lateral edge of the mobile platform gasket. The surgeon performs longitudinal tibial osteotomy based on this.

[0039] In another embodiment of the present application, the fixed foot 5 is made of a hard material, the outside of the fixed foot 5 is wrapped with a rubber pad, the fixed foot 5 is hinged to the fixed support arm 4, and a torsion spring is connected between the fixed foot 5 and the fixed support arm 4. The torsion spring always gives the fixed foot 5 a force to fold toward the fixed support arm 4, so that the fixed foot 5 always clamps both sides of the bone test mold to improve the clamping stability.

[0040] In another embodiment of the present application, the fixing foot 5 adopts a connecting bolt, and four threaded holes are set at corresponding positions on the femoral trial model according to the end position of the fixed support arm 4, and the two threaded holes on the right side are in contact with the outer side of the femoral trial model.

[0041] When installing the guide, loosen the fixing switch 3, make the end position of the fixing arm 4 correspond to the position of the threaded hole, use the connecting bolt to fix the fixing arm 4 at the threaded hole, and the center of the fixing arm 4 is located at the center position of the bottom of the femoral trial mold. Tighten the fixing switch 3 to complete the installation.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A tibial osteotomy guide fixed to a unicompartmental femoral trial mold, characterized in that: It comprises a fixer (1) and an imprinter (2); The fixer (1) comprises a fixed switch (3) and two fixed arms (4), both ends of the two fixed arms (4) are provided with fixed feet (5), the two fixed arms (4) are cross-hinged at the center, and the fixed switch (3) is provided at the hinge. The curvature of the imprinter (2) is a long strip plate consistent with the femoral test mold, and the extension direction of the imprinter (2) is provided with an extension direction. Two connecting blocks are slidably connected in the slide groove (6), and the two connecting blocks are respectively connected to the ends of the same side of the two fixed arms (4); A plurality of imprinting teeth (7) are arranged in the extension direction of the imprinter (2), and the imprinting teeth (7) are located on the convex surface of the imprinter (2).

2. The tibial osteotomy guide fixed to the unicompartmental femoral trial mold according to claim 1, characterized in that: The two fixed support arms (4) are hinged by bolts, and the fixed switch (3) is fixed by nuts, the nuts are connected with the bolts, and the two fixed support arms (4) are located between the nuts and the bolts.

3. The tibial osteotomy guide fixed to the unicompartmental femoral trial mold according to claim 2, characterized in that: A rotating handle is arranged on the nut.

4. The tibial osteotomy guide fixed to the unicompartmental femoral trial mold according to claim 1, characterized in that: The fixing foot (5) is made of hard material.

5. The tibial osteotomy guide fixed to the unicompartmental femoral trial mold according to claim 1, characterized in that: The outside of the fixed foot (5) is wrapped with a rubber pad.

6. The tibial osteotomy guide fixed to the unicompartmental femoral trial mold according to claim 1, characterized in that: The fixed foot (5) is hinged to the fixed support arm (4), and a torsion spring is connected between the fixed foot (5) and the fixed support arm (4).

7. The tibial osteotomy guide fixed to the unicompartmental femoral trial mold according to claim 1, characterized in that: The fixing foot (5) adopts a connecting bolt, and four threaded holes are arranged at corresponding positions on the femoral trial mold according to the end position of the fixing support arm (4), and the two threaded holes on the right side are fitted to the outer side of the femoral trial mold.

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