Tibia osteotomy device

Abstract

The tibial osteotomy device provided by the present invention includes an osteotomy assembly, a fixing assembly, and a measuring member. The osteotomy assembly includes an osteotomy guide plate and a mounting frame that are connected to each other. The osteotomy guide plate has an osteotomy groove, and the mounting frame is used to be fixed to the lower limb of the patient and can be telescopic. The fixing assembly is detachably connected to the osteotomy guide plate, and the measuring member is movably connected to the fixing assembly. The measuring member includes a flat portion, a first bending portion, and a second bending portion. The flat portion is in the shape of a flat plate, and the first bending portion and the second bending portion are respectively connected to opposite ends of the flat portion and bend towards the same side relative to the flat portion. For the tibial osteotomy device provided by the present invention, the measuring member is abutted against the posterior condyle of the femur, and the posterior condyle of the femur is used as a measurement reference, so that the measurement accuracy will not be affected by the wear of the tibial articular surface or the distal femoral articular surface. After the measuring member is removed, the osteotomy assembly can accurately perform tibial osteotomy.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a tibial osteotomy device. Background Art

[0002] During the unicompartmental knee arthroplasty procedure, osteotomy needs to be performed on the tibial side to install a suitable tibial prosthesis. The accuracy of osteotomy will directly affect the result of prosthesis installation.

[0003] Due to reasons such as long-term intense activities, degeneration, and osteoarthritis, the knee joint cartilage wears out, which in turn causes pain to varying degrees. Usually, the distal femur and the tibial articular surface will experience more wear. In the case of a lesion in a single compartment of the knee joint, the unicompartmental knee arthroplasty can achieve the goals of minimally invasive, small incision, less osteotomy volume, low infection rate, and rapid recovery.

[0004] Currently, the traditional tibial osteotomy method is to use a probe to refer to the lowest point of the tibial articular surface and adjust the height of the tibial osteotomy guide plate so that the osteotomy surface is located at a set distance below the lowest point of the articular surface. However, the knee joint lesions of different patients are different, and there are significant differences in the wear positions and wear degrees of the distal femur and the tibial articular surface of different patients. In the case of high wear degree of the patient, it often leads to excessive osteotomy. Moreover, the lowest point of the articular surface is difficult to capture and can only be found by relying on the doctor's experience. Its osteotomy accuracy is poor, which easily leads to inaccurate osteotomy positions. Eventually, there will be a difference between the artificial articular surface formed after installing the prosthesis and the originally healthy articular surface of the patient. Summary of the Invention

[0005] Based on this, the present invention provides a tibial osteotomy device, which effectively solves the technical problem that poor osteotomy accuracy easily leads to inaccurate osteotomy positions and affects prosthesis installation.

[0006] A tibial osteotomy device provided by the present invention includes:

[0007] An osteotomy assembly, including an osteotomy guide plate and a mounting bracket connected to each other. The osteotomy guide plate has an osteotomy groove, and the mounting bracket is used to be fixed to the lower limb of the patient and can be telescopic;

[0008] A fixing assembly, detachably connected to the osteotomy guide plate; and

[0009] A measuring member, movably connected to the fixing assembly. The measuring member includes a flat portion, a first bending portion, and a second bending portion. The flat portion is in a flat plate shape, and the first bending portion and the second bending portion are respectively connected to opposite ends of the flat portion and bend towards the same side relative to the flat portion.

[0010] In one embodiment, the radius of curvature of the first bending portion and / or the second bending portion ranges from 10 mm to 25 mm.

[0011] In one embodiment, the thickness of the straight portion of the measuring member ranges from 1 mm to 5 mm, and / or the length of the straight portion of the measuring member ranges from 1 mm to 5 mm.

[0012] In one embodiment, the fixing assembly includes a guide member and a connecting seat connected to each other. The measuring member is movably connected to the guide member, and the connecting seat is detachably connected to the osteotomy guide plate.

[0013] In one embodiment, the measuring member includes a connecting portion located at an end of the second bending portion away from the straight portion. A strip-shaped groove is formed in the connecting portion. The guide member is movably inserted through the strip-shaped groove and limits the connecting portion in the vertical direction to the connecting seat.

[0014] In one embodiment, the connecting portion is strip-shaped or rod-shaped, and the extending direction of the connecting portion is parallel to the extending direction of the straight portion.

[0015] In one embodiment, a guiding inlet is formed in the connecting portion. The guiding inlet is communicated with the strip-shaped groove. The size of the guiding inlet is larger than the width of the strip-shaped groove. The end portion of the guide member has a convex edge, and the size of the convex edge is larger than the width of the strip-shaped groove and smaller than the size of the guiding inlet.

[0016] In one embodiment, the convex edge of the guide member is threadedly connected to the guide member body.

[0017] In one embodiment, the connecting seat is provided with a fixing arm for plugging and fixing with the osteotomy guide plate.

[0018] In one embodiment, the fixing assembly further includes a pressing member and an adjusting member. The pressing member is movably connected to the connecting seat and is disposed opposite to the fixing arm. When the adjusting member is adjusted, the pressing member can move relative to the fixing arm to clamp or release the osteotomy guide plate.

[0019] The tibial osteotomy device provided by the present invention includes an osteotomy assembly, a fixing assembly, and a measuring member. The measuring member is detachably connected to the osteotomy guide plate through the fixing assembly, and the measuring member is movably connected to the fixing assembly. When the tibial osteotomy device is fixed to the tibia, the measuring member can move relative to the fixing assembly to abut against the posterior condyle of the femur. Taking the posterior condyle of the femur as the measurement reference, the measurement accuracy will not be affected by the wear of the tibial articular surface or the distal femoral articular surface. And since the distance from the measurement reference point to the osteotomy groove of the osteotomy guide plate is fixed, which exactly corresponds to the osteotomy amount, the tibial osteotomy can be accurately performed by using the osteotomy assembly after the measuring member is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of the tibial osteotomy device in an embodiment;

[0022] Figure 2 is Figure 1 a side schematic diagram of the tibial osteotomy device shown in one of the usage states;

[0023] Figure 3 is Figure 1 a schematic structural diagram of the measuring member of the tibial osteotomy device shown;

[0024] Figure 4 is Figure 1 a schematic structural diagram of the fixing assembly of the tibial osteotomy device shown;

[0025] Figure 5 is Figure 1 a schematic structural diagram of the osteotomy assembly of the tibial osteotomy device shown;

[0026] FIG. 6(a) is a schematic connection structure diagram of the fixing assembly and the osteotomy guide plate of the tibial osteotomy device in an embodiment;

[0027] FIG. 6(b) is a schematic connection structure diagram of the fixing assembly and the osteotomy guide plate in another embodiment of the tibial osteotomy device;

[0028] FIG. 6(c) is a schematic connection structure diagram of the fixing assembly and the osteotomy guide plate in yet another embodiment of the tibial osteotomy device;

[0029] FIG. 6(d) is a schematic connection structure diagram of the fixing assembly and the osteotomy guide plate in yet another embodiment of the tibial osteotomy device. Detailed Implementation Manner

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manner of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 should not be construed as a limitation of the present invention.

[0032] 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0036] Referring to Figure 1 and Figure 2 As shown, a tibial osteotomy device provided by the present invention includes a measuring member 1, a fixing assembly 2 and an osteotomy assembly 3. The measuring member 1 is connected to the osteotomy assembly 3 through the fixing assembly 2. The measuring member 1 is used to measure the gap of a unicompartmental knee joint. Specifically, it measures the gap (i.e., the flexion gap) between the posterior condyle A of the femur and the articular surface B1 of the tibia B.

[0037] When using the tibial osteotomy device, the osteotomy assembly 3 is fixed to the tibia B, and the measuring member 1 is fixed in a suitable position through the fixing assembly 2, so that the measuring member 1 is inserted into the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B to measure the gap.

[0038] Combined with Figure 3 As shown, the measuring member 1 includes a first bending portion 1a1, a straight portion 1b and a second bending portion 1a2.

[0039] Among them, the straight portion 1b is generally in a flat plate shape, that is, the upper and lower surfaces of the straight portion 1b are parallel planes, and the vertical distance between the two surfaces defines the thickness of the straight portion 1b, and this thickness remains constant throughout the straight portion 1b. In this way, the lower surface of the straight portion 1b is substantially parallel to the articular surface B1 of the tibia B, which is conducive to the stable placement of the measuring member 1, and the shape of the straight portion 1b is adapted to the flexion and extension gap of the knee joint, and it is easy to locate during use.

[0040] The first bending portion 1a1 and the second bending portion 1a2 are respectively connected to opposite ends of the straight portion 1b. It should be noted that the opposite ends of the straight portion 1b refer to the two ends of the straight portion 1b in the extending direction of the measuring member 1, that is, the two ends in the length direction of the measuring member 1. The distance between the two ends of the straight portion 1b defines the length of the straight portion 1b.

[0041] The first bending portion 1a1 and the second bending portion 1a2 bend towards the same side relative to the straight portion 1b. That is to say, relative to one surface of the straight portion 1b, the first bending portion 1a1 and the second bending portion 1a2 have the same positive curvature or the same negative curvature. In this way, the first bending portion 1a1, the straight portion 1b, and the second bending portion 1a2 are integrally bowed.

[0042] Combined Figure 2 As shown, when the measuring member 1 is connected to the osteotomy assembly 3 through the fixing assembly 2, the straight portion 1b is located at the lowest position of the bowed measuring member 1. Thus, when measuring the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B, the measuring member 1 is inserted into the gap, facilitating the use of the first bending portion 1a1 and the second bending portion 1a2 at both ends of the straight portion 1b to place the straight portion 1b between the posterior condyle A of the femur and the articular surface B1 of the tibia B, such that the surface of the straight portion 1b abuts against the position of the posterior condyle A of the femur closest to the articular surface B1 of the tibia B (hereinafter referred to as the "lowest point A1"). In this way, the lowest point A1 of the posterior condyle A of the femur can be used as a measurement reference.

[0043] When the knee joint is worn, the posterior condyle A of the femur generally does not wear easily and remains relatively intact. Thus, when the measuring member 1 is inserted into the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B, such that the straight portion 1b is located between the posterior condyle A of the femur and the articular surface B1 of the tibia B for measurement, the straight portion 1b abuts against the lowest point A1 of the posterior condyle A of the femur, using the posterior condyle A of the femur as a measurement reference. In this way, the osteotomy amount measured will not be affected by uncertain factors such as the doctor's operation, the wear of the articular surface B1 of the tibia B, and the wear of the distal articular surface of the femur. Thus, the measured osteotomy amount is relatively accurate, thereby improving the accuracy of the osteotomy position.

[0044] It should be noted that the surfaces of the first bending portion 1a1 and the second bending portion 1a2 are smoothly joined to the straight portion 1b. Thus, when the measuring member 1 measures the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B, the straight portion 1b is in a low position relative to the first bending portion 1a1 and the second bending portion 1a2. Thus, by reciprocally moving the measuring member 1, the straight portion 1b can be conveniently adjusted to contact the lowest point A1 of the posterior condyle A of the femur.

[0045] The radius of curvature r of the first bending portion 1a1 may be fixed, that is, the first bending portion 1a1 is a part of an arc from a standard circle. In other embodiments, the radius of curvature r of the first bending portion 1a1 may also be unfixed.

[0046] For example, the radius of curvature r of the first bending portion 1a1 gradually decreases in the direction away from the straight portion 1b. For another example, the first bending portion 1a1 is formed by smoothly joining multiple arc segments with different radii of curvature r, so that when the measuring member 1 is moved, the straight portion 1b can be adjusted more precisely to contact the lowest point A1 of the posterior condyle A of the femur. Specifically, since the first bending portion 1a1 and the second bending portion 1a2 are bent on the same side of the straight portion 1b and protrude above the straight portion 1b, the straight portion 1b is the lowest point in the bent state of the measuring member 1. When the straight portion 1b is not adjusted to contact the lowest point A1 of the posterior condyle A of the femur, during the process of moving the measuring member 1, when the measuring member 1 remains in contact with the posterior condyle A, when different positions of the measuring member 1 contact the lowest point A1 of the posterior condyle A of the femur, the measuring member 1 will be at different heights. That is to say, when the posterior condyle A of the femur contacts the surface of the first bending portion 1a1 or the second bending portion 1a2, the measuring member 1 is offset toward the side where the articular surface B1 of the tibia B is located under the abutment of the posterior condyle A of the femur. As the measuring member 1 moves, the closest distance between the measuring member 1 and the articular surface B1 of the tibia B also changes. Only when the straight portion 1b of the measuring member 1 moves to contact the lowest point A1 of the posterior condyle A of the femur, the closest distance between the straight portion 1b of the measuring member 1 and the articular surface B1 of the tibia B will be stably determined, and at this time, the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B measured by the measuring member 1 will be more accurate.

[0047] The value range of the radius of curvature r of the first bending portion 1a1 is 10 mm to 25 mm. Taking the circular arc with the first bending portion 1a1 as the standard as an example, the radius of curvature r at any position of the first bending portion 1a1 is the same. For example, the radius of curvature r of the first bending portion 1a1 is 10 mm, 15 mm, 20 mm or 25 mm. When the first bending portion 1a1 includes a plurality of circular arc segments with different radii of curvature r, the radius of curvature r of the first bending portion 1a1 can be understood as the set of the radii of curvature of the plurality of circular arc segments included in the first bending portion 1a1. That is to say, although the radii of curvature r between the plurality of circular arc segments are different, the value range of the radius of curvature r of any one circular arc segment is still controlled within the range of 10 mm to 25 mm. For example, the first bending portion 1a1 includes three circular arc segments, and the three circular arc segments are smoothly joined to each other, and the radii of curvature r are respectively 10 mm, 15 mm and 20 mm. Or, the radii of curvature r of the three circular arc segments are respectively 10 mm, 12 mm and 18 mm. The number of circular arc segments included in the first bending portion 1a1 is not limited herein. No matter how many circular arc segments the first bending portion 1a1 includes, as long as the radius of curvature r of the circular arc segments included therein is within 10 mm to 25 mm.

[0048] Correspondingly, the value range of the radius of curvature of the second bending portion 1a2 can be 10 mm to 25 mm. The second bending portion 1a2 can be a standard circular arc, that is, the radius of curvature at any position of the second bending portion 1a2 is the same. In other embodiments, the second bending portion 1a2 can be composed of a plurality of circular arc segments with different radii of curvature. The structural form of the second bending portion 1a2 can refer to the first bending portion 1a1, and will not be elaborated herein.

[0049] In the above embodiments, by controlling the radii of curvature of the first bending portion 1a1 and the second bending portion 1a2 within 10 mm to 25 mm, the overall measuring member 1 will not be overly bent, and it is easy to insert the measuring member 1 into the gap between the femoral posterior condyle A and the articular surface B1 of the tibia B, and then the first bending portion 1a1 and the second bending portion 1a2 abut against the femoral posterior condyle A, causing the straight portion 1b to be lifted off. As a result, during the process of moving the measuring member 1, the straight portion 1b can never contact the lowest point A1 of the femoral posterior condyle A, affecting the measurement effect.

[0050] By controlling the radii of curvature of the first bending portion 1a1 and the second bending portion 1a2 within 10 mm to 25 mm, it is also beneficial to maintain sufficient bending of the first bending portion 1a1 and the second bending portion 1a2, so that the straight portion 1b is significantly at the lowest point of the bend, so that before and after the straight portion 1b contacts the femoral posterior condyle A, the position change of the measuring member 1 is more obvious, so as to accurately judge whether the straight portion 1b contacts the femoral posterior condyle A, so that when the femoral posterior condyle A is used as the measurement reference point subsequently, the osteotomy position is more accurate, and thus it is beneficial to the accurate installation and positioning of the prosthesis.

[0051] In some embodiments, in combination with Figure 3 As shown, the thickness s of the straight portion 1b of the measuring member 1 ranges from 1 mm to 5 mm, such as 1 mm, 2 mm, 3 mm, 4 mm or 5 mm, and the length m of the straight portion 1b of the measuring member 1 ranges from 1 mm to 5 mm, such as 1 mm, 2 mm, 3 mm, 4 mm or 5 mm. Thus, it meets the selection requirements for measuring the gap of most knee joints.

[0052] For different patients, the wear degree of the joint surface B1 of the tibia B may be different, and then the gap between the posterior condyle A of the femur and the joint surface B1 of the tibia B is inconsistent. Therefore, in actual operation, when the measuring member 1 is inserted into the gap between the posterior condyle A of the femur and the joint surface B1 of the tibia B and the straight portion 1b is located at the lowest point A1 of the posterior condyle A of the femur, the fitting tightness degree of the measuring member 1 between the posterior condyle A of the femur and the joint surface B1 of the tibia B will vary due to the different gaps. In this embodiment, by controlling the thickness s of the straight portion 1b of the measuring member 1 to range from 1 mm to 5 mm and the length m of the straight portion 1b of the measuring member 1 to range from 1 mm to 5 mm, a variety of models of the measuring member 1 are configured for selection. The various models of the measuring member 1 have different thicknesses and lengths, so that when in use, according to actual needs, a measuring member 1 with an appropriate thickness and length of the straight portion 1b can be selected to ensure that the gap from the posterior condyle A of the femur to the joint surface B1 of the tibia B conforms to the normal size.

[0053] In some embodiments, in combination with Figure 3 As shown, the width t of the measuring member 1 ranges from 3 mm to 15 mm, such as 3 mm, 6 mm, 9 mm, 12 mm or 15 mm. When using the measuring member 1 to find the lowest point A1 of the posterior condyle A of the femur, the width of the measuring member 1 is appropriate, so that the first bending portion 1a1 and the second bending portion 1a2 can more easily guide the straight portion 1b to the position in contact with the lowest point A1 of the posterior condyle A of the femur, avoiding the situation that due to the too narrow width t of the measuring member 1, it is easy to run out of the gap between the posterior condyle A of the femur and the joint surface B1 of the tibia B, which affects the measurement effect.

[0054] In some embodiments, in combination with Figure 4 As shown, the fixing assembly 2 includes a connecting seat 2b, a pressing member 2d and an adjusting member 2c. The measuring member 1 is movably connected to the connecting seat 2b and can be detached from the connecting seat 2b, so that a suitable model of the measuring member 1 can be replaced. At the same time, after the osteotomy amount is measured by using the measuring member 1, the measuring member 1 can be quickly detached to facilitate the subsequent osteotomy operation using the osteotomy assembly 3.

[0055] It should be noted that there are various structures for the movable connection between the measuring member 1 and the connecting seat 2b. In combination with Figure 3As shown, the measuring member 1 includes a connecting portion 1c, and the connecting portion 1c is located at one end of the second bending portion 1a2 away from the straight portion 1b. After the connecting portion 1c is connected to the connecting seat 2b, the measuring member 1 will be stably fixed to the connecting seat 2b. The connecting portion 1c as a whole can be strip-shaped or rod-shaped, or other shapes, as long as it can meet the requirements of the movable connection between the measuring member 1 and the connecting seat 2b.

[0056] Combined with Figure 3 and Figure 4 As shown, a strip-shaped groove 1c1 is formed on the connecting portion 1c, and a guiding member 2a1 is provided on the connecting seat 2b. As Figure 1 shown, the guiding member 2a1 movably passes through the strip-shaped groove 1c1, and limits the connecting portion 1c in the vertical direction to the connecting seat 2b, so that the distance between the upper surface of the straight portion 1b of the measuring member 1 and the osteotomy groove 3a1 is constant, ensuring that the osteotomy amount remains unchanged. Under the constraint of the guiding member 2a1, the connecting portion 1c can only perform translational motion or rotation relative to the connecting seat 2b through the strip-shaped groove 1c1, so as to insert the measuring member 1 into the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B.

[0057] Specifically, after the guiding member 2a1 of the connecting seat 2b is matched with the strip-shaped groove 1c1 of the connecting portion 1c, the measuring member 1 is moved relative to the connecting seat 2b to a position close to the articular surface B1 of the tibia B. By rotating the measuring member 1, the measuring member 1 is inserted into the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B, and then the measuring member 1 is translated so that the straight portion 1b is opposite to the lowest point A1 of the posterior condyle A of the femur, that is, the lowest point of the measuring member 1 is opposite to the lowest point A1 of the posterior condyle A of the femur. Since in the vertical direction, the cooperation between the guiding member 2a1 and the strip-shaped groove 1c1 limits the connecting portion 1c to the connecting seat 2b, the height of the lowest point position of the measuring member 1 relative to the connecting seat 2b in the vertical direction is determined. Thus, when the straight portion 1b of the measuring member 1 contacts the lowest point A1 of the posterior condyle A of the femur, the intact posterior condyle A of the femur can be used as a measurement reference. Furthermore, since the distance between the upper surface of the straight portion 1b of the measuring member 1 and the osteotomy groove 3a1 is constant, when the osteotomy assembly 3 is used for osteotomy operation, an accurate osteotomy amount can be obtained, and the accuracy of the osteotomy position can be improved.

[0058] It should be noted that when the connecting portion 1c is strip-shaped or rod-shaped, the extending direction of the connecting portion 1c is parallel to the extending direction of the straight portion 1b. Thus, when adjusting the movement of the measuring member 1 relative to the connecting seat 2b, the straight portion 1b remains substantially parallel to the articular surface B1 of the tibia B, so that when the straight portion 1b is adjusted to contact the lowest point A1 of the posterior condyle A of the femur, the lowest point of the posterior condyle A of the femur can be found more accurately by using the straight portion 1b, and the accuracy of the gap measurement will not be affected due to a large inclination of the straight portion 1b relative to the articular surface B1 of the tibia B.

[0059] Combined withFigure 1 and Figure 3 As shown, the end position of the strip groove 1c1 has an introduction port 1c2, the size of the introduction port 1c2 is larger than the width of the strip groove 1c1, and the end of the guide member 2a1 has a convex edge 2a2, the size of the convex edge 2a2 is larger than the width of the strip groove 1c1 and smaller than the size of the introduction port 1c2. The size mentioned here refers to the maximum radial size of the figure, for example, for a circle, it refers to its diameter, and for a polygon, it refers to the diameter of its circumscribed circle. When it is necessary to match the connecting part 1c with the connecting seat 2b, the guide member 2a1 is inserted into the strip groove 1c1 from the introduction port 1c2. Since the size of the convex edge 2a2 is larger than the strip groove 1c1, the guide member 2a1 can only move or rotate along the strip groove 1c1, and then the measuring member 1 can rotate or translate relative to the connecting seat 2b, so as to adjust the straight part 1b to abut against the lowest point A1 of the posterior condyle A of the femur. Under the limitation of the convex edge 2a2, the guide member 2a1 cannot be separated from the strip groove 1c1, so as to ensure the stability of the measuring member 1 during the movement and adjustment process relative to the connecting seat 2b, and to prevent the measuring member 1 from slipping off the connecting seat 2b and requiring the measuring member 1 to be reassembled, which affects the convenience of operation. When the measuring member 1 is used to complete the measurement and needs to be removed from the connecting seat 2b, it is only necessary to move the measuring member 1 to fold the guide member 2a1 at the introduction port 1c2. Since the size of the convex edge 2a2 is smaller than the introduction port 1c2, the guide member 2a1 can be withdrawn from the introduction port 1c2, thereby meeting the need to remove the measuring member 1 from the connecting seat 2b.

[0060] Furthermore, the flange 2a2 is connected to the main body of the guide member 2a1 by a thread, and after the connecting portion 1c is moved to an appropriate position, the flange 2a2 can be tightened by the thread, so that the flange 2a1 presses the connecting portion 1c of the measuring member 1 against the connecting seat 2b, locking the relative position of the measuring member 1 and the connecting seat 2b. The threaded connection is stable and reliable, and has a long service life.

[0061] The position of the inlet 1c2 can be located not only at the end of the strip groove 1c1, but also at any position in the middle of the strip groove 1c1, as long as the inlet 1c2 can accommodate the guide member 2a1 to enter the strip groove 1c1 and will not affect the constraint of the strip groove 1c1 on the convex edge 2a2 and the connection part 1c can be movably limited to the connecting seat 2b.

[0062] There may be multiple introduction ports 1c2. For example, in some embodiments, an introduction port 1c2 is provided at each end of the strip groove 1c1, so that when the guide member 2a1 needs to be fitted into the strip groove 1c1 or removed from the strip groove 1c1 through the introduction port 1c2, the introduction port 1c2 that is closer to the guide member 2a1 can be flexibly selected, thereby improving the convenience of operation and enabling the measuring member 1 to be quickly installed on or detached from the connecting seat 2b.

[0063] In other embodiments, the connection structure between the connecting portion 1c and the connecting seat 2b is not limited to the above-mentioned cooperation form of the guiding member 2a1 and the strip-shaped groove 1c1. For example, the connecting portion 1c and the connecting seat 2b are magnetically coupled to achieve the movable connection between the measuring member 1 and the connecting seat 2b, that is, it can meet the need for the measuring member 1 to move relative to the connecting seat 2b and insert into the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B. At the same time, the magnetic attraction between the connecting portion 1c and the connecting seat 2b can also improve the stability of the measuring member 1 during the movement relative to the connecting seat 2b and reduce the probability of the measuring member 1 accidentally falling off the connecting seat 2b.

[0064] Combined with Figure 1 and Figure 2 shown, the pressing member 2d is used to lock or release the connection between the connecting seat 2b and the osteotomy assembly 3 under the drive of the adjusting member 2c.

[0065] Specifically, combined with Figures 4 to 6(a) shown, the connecting seat 2b is provided with a fixed arm 2b1. The pressing member 2d is movably connected to the connecting seat 2b and is disposed opposite to the fixed arm 2b1 to form a clamping space. When adjusting the adjusting member 2c, the pressing member 2d can move relative to the fixed arm 2b1, so that the clamping space is reduced or increased to clamp or release the osteotomy assembly 3.

[0066] To facilitate the understanding of the connection structure between the connecting seat 2b and the osteotomy assembly 3, the possible structures of the osteotomy assembly 3 will be described below.

[0067] Combined with Figure 2 and Figure 5 shown, the osteotomy assembly 3 includes an osteotomy guide plate 3a and a mounting frame. The osteotomy guide plate 3a has an osteotomy groove 3a1 and is installed at the osteotomy position of the tibia B through the mounting frame. Specifically, the mounting frame can be telescoped. When performing osteotomy operations, the mounting frame is fixed to the patient's lower limb, and the position of the osteotomy guide plate 3a relative to the tibia B is adjusted by the telescoping of the mounting frame, so that the osteotomy groove 3a1 of the osteotomy guide plate 3a is aligned with the osteotomy position of the tibia B, so that the osteotomy tool can accurately perform osteotomy along the osteotomy groove 3a1.

[0068] Taking the tibia B as a reference, the osteotomy guide plate 3a is a structural member for guiding the osteotomy tool to perform osteotomy operations on the tibia B. The osteotomy groove 3a1 penetrates through the front and rear sides of the osteotomy guide plate 3a, that is, the osteotomy groove 3a1 penetrates through the two side surfaces of the osteotomy guide plate 3a in the osteotomy direction. Thus, when the osteotomy guide plate 3a is installed at the osteotomy position of the tibia B, the osteotomy tool can pass through the osteotomy groove 3a1 to perform osteotomy operations on the tibia.

[0069] When performing osteotomy using a tibial osteotomy device, before operating the osteotomy component 3 for osteotomy, the measuring component 1 needs to be installed on the osteotomy component 3 using the connecting seat 2b to measure the gap between the posterior condyle A of the femur and the articular surface B1 of the tibia B, and find the lowest point of the posterior condyle A of the femur, so that the osteotomy component 3 can perform osteotomy at the correct position. After the measuring component 1 completes the measurement, the measuring component 1 is no longer needed. At this time, the connecting seat 2b can be removed from the osteotomy component 3 to use the osteotomy component 3 for subsequent osteotomy operations. Thus, the connecting seat 2b together with the measuring component 1 can be flexibly installed or disassembled for adaptive selection during different operation processes.

[0070] The connection between the connecting seat 2b and the osteotomy component 3 can be through Figures 6(a) to 6(d) any one of the structures shown in

[0071] Referring to Fig. 6(a), in the embodiment where the fixing component 2 includes a connecting seat 2b, a pressing component 2d, and an adjusting component 2c, the pressing component 2d is rotatably connected to the connecting seat 2b through a rotating shaft 2e. When it is necessary to connect the connecting seat 2b to the osteotomy guide plate 3a of the osteotomy component 3, the fixing arm 2b1 of the connecting seat 2b extends into the osteotomy groove 3a1 of the osteotomy guide plate 3a. By operating the adjusting component 2c, the pressing component 2d is rotated around the rotating shaft 2e, so that a partial structure of the osteotomy guide plate 3a near the upper wall surface of the osteotomy groove 3a1 is clamped and fixed between the pressing component 2d and the fixing arm 2b1, thereby stably connecting the connecting seat 2b to the osteotomy guide plate 3a and completing the installation between the measuring component 1 and the osteotomy component 3. When it is necessary to disconnect the connecting seat 2b from the osteotomy component 3, only need to operate the adjusting component 2c to make the pressing component 2d rotate in the reverse direction around the rotating shaft 2e to release the clamping of the osteotomy guide plate 3a, so that the fixing arm 2b1 of the connecting seat 2b can be withdrawn from the osteotomy groove 3a1.

[0072] The adjusting component 2c can be a bolt. The adjusting component 2c is threadedly connected to the connecting seat 2b and abuts against the pressing component 2d. The position where the adjusting component 2c abuts against the pressing component 2d is on the side of the pressing component 2d where the rotating shaft 2e is provided and away from the fixing arm 2b1. Thus, when tightening the adjusting component 2c to make the adjusting component 2c perform a screwing movement relative to the connecting seat 2b, the adjusting component 2c can adjust the abutment against the pressing component 2d, so that the pressing component 2d rotates around the rotating shaft 2e to clamp and fix the osteotomy guide plate 3a or release the clamping of the osteotomy guide plate 3a.

[0073] In some other embodiments, the adjusting member 2c may be a pressing structure, which drives the pressing member 2d to rotate around the rotating shaft 2e by pressing to clamp and fix the osteotomy guide plate 3a. For example, the adjusting member 2c is inserted through the connecting seat 2b, and when the pressing adjusting member 2c abuts against the pressing member 2d to rotate around the rotating shaft 2e until the osteotomy guide plate 3a is clamped, the adjusting member 2c can lock the relative position with the connecting seat 2b through a limiting convex rib (not shown in the figure), so that the pressing member 2d and the fixed arm 2b1 are kept clamped and fixed to the osteotomy guide plate 3a, so as to enable the stable connection between the connecting seat 2b and the osteotomy guide plate 3a. When it is necessary to remove the connecting seat 2b, only need to move the adjusting member 2c to make the limiting convex rib disengage from the cooperation with the connecting seat 2b, so that the adjusting member 2c reduces or releases the pressing force on the pressing member 2d, so that the pressing member 2d no longer presses tightly against the osteotomy guide plate 3a, so that the fixed arm 2b1 of the connecting seat 2b can be removed from the osteotomy groove 3a1, thus completing the removal operation of the connecting seat 2b.

[0074] Continuing to refer to FIG. 6(a), the cross section of the pressing member 2d is L-shaped, including a clamping arm 2d1 and a resisting arm 2d2 that are vertically connected. So as to facilitate setting the rotating shaft 2e of the pressing member 2d near the connection between the clamping arm 2d1 and the resisting arm 2d2, so that when the adjusting member 2c moves relative to the connecting seat 2b and the adjusting member 2c abuts against the resisting arm 2d2, the pressing member 2d can have sufficient torque under the abutment of the adjusting member 2c, so that a large clamping force can be obtained between the clamping arm 2d1 and the fixed arm 2b1, so as to stably clamp and fix the osteotomy guide plate 3a, so that the installation stability between the measuring member 1 and the osteotomy guide plate 3a can be improved, so that during the measurement process of the measuring member 1, it is not easy for the connecting seat 2b and the osteotomy assembly 3 to become loose, so as to ensure that when the lowest point A1 of the femoral posterior condyle A contacts the measuring member 1, the distance between the lowest point A1 of the femoral posterior condyle A and the osteotomy groove 3a1 remains unchanged, which is beneficial to improving the accuracy of the osteotomy position.

[0075] The connecting seat 2b and the osteotomy guide plate 3a of the osteotomy assembly 3 may also not adopt a clamping and fixing connection method. For example, the connecting seat 2b and the osteotomy assembly 3 are connected by means of plug-in fit.

[0076] For example, in another embodiment, as shown in FIG. 6(b), the connecting seat 2b is provided with a plug-in block 2f. The plug-in block 2f is inserted and matched with the osteotomy groove 3a1 of the osteotomy guide plate 3a, so that the connecting seat 2b is stably connected to the osteotomy guide plate 3a. With this structural arrangement, the connecting seat 2b can also meet the need for convenient disassembly and assembly between the measuring member 1 and the osteotomy guide plate 3a. When measurement is required, the measuring member 1 is quickly installed on the osteotomy guide plate 3a by using the connecting seat 2b. Thus, when adjusting the measuring member 1 so that the straight portion 1b contacts the lowest point A1 of the posterior condyle A of the femur, the measuring member 1 is removed, and the osteotomy cutter is guided by the osteotomy groove 3a1 of the osteotomy guide plate 3a, and osteotomy can be performed at an accurate position, avoiding the influence of inaccurate measurement on the osteotomy position accuracy when using the worn joint surface B1 of the tibia B as a reference.

[0077] For another example, as shown in FIG. 6(c), in some other embodiments, the plug-in fit between the connecting seat 2b and the osteotomy guide plate 3a may not utilize the osteotomy groove 3a1 of the osteotomy guide plate 3a. Specifically, the connecting seat 2b is provided with two clamping arms 2g arranged at intervals. The gap between the two clamping arms 2g can accommodate the osteotomy guide plate 3a, so that the osteotomy guide plate 3a is inserted and fixed between the two clamping arms 2g. In this way, the measuring member 1 can be fixed to the osteotomy guide plate 3a through the connecting seat 2b, and then the relative position between the measuring member 1 and the osteotomy guide plate 3a can be determined, that is, the relative position between the measuring member 1 and the osteotomy groove 3a1 is determined. The osteotomy position measured by the measuring member 1 will be consistent with the position where the subsequent osteotomy cutter passes through the osteotomy groove 3a1 for osteotomy. Since in the embodiments of the present invention, when the measuring member 1 measures the osteotomy position, it uses the contact between the straight portion 1b and the lowest point A1 of the posterior condyle A of the femur as a reference, the measured osteotomy position will not be affected by the wear of the joint surface B1 of the tibia B. This tibia osteotomy device is overall more convenient to operate and the osteotomy position is relatively accurate.

[0078] In some other embodiments, as shown in FIG. 6(d), a plug-in portion 2h is provided at one end of the connecting seat 2b far from the guiding portion, and a jack 3a2 is formed on the osteotomy guide plate 3a. The plug-in portion 2h is matched with the jack 3a2, so that the connecting seat 2b is fixed to the osteotomy guide plate 3a.

[0079] It should be noted that the jack 3a2 can penetrate the side wall of the osteotomy groove 3a1 to communicate with the osteotomy groove 3a1, so that the plug-in portion 2h of the connecting seat 2b and the jack 3a2 have as large a mating depth as possible, improving the connection stability between the connecting seat 2b and the osteotomy guide plate 3a.

[0080] For the detachable connection form between the connecting seat 2b and the osteotomy guide plate 3a, other structures can also be adopted, as long as when the osteotomy guide plate 3a is mounted on the tibia through the mounting bracket, the connecting seat 2b can detachably assemble the measuring member 1 to the osteotomy guide plate 3a.

[0081] The fixing assembly 2 provided by the present application has reliable locking and a small volume. During adjustment, it will not be interfered by the patient's lower limb and will also block the operator's line of sight less, which is more conducive to surgical operation.

[0082] In some embodiments, as shown in Figure 5 the mounting bracket includes a clamping portion 3e, a cross bar 3d and a lifting assembly, and the clamping portion 3e is connected to the cross bar 3d. As shown in Figure 2 the clamping portion 3e is used for clamping and fixing to the ankle joint B2. The osteotomy guide plate 3a is connected to the cross bar 3d through the lifting assembly, and under the adjustment of the lifting assembly, the osteotomy guide plate 3a can be moved to a suitable position to meet the osteotomy requirement.

[0083] In some embodiments, the lifting assembly includes a sleeve 3b and a vertical rod 3c. The sleeve 3b is slidably sleeved on the vertical rod 3c. One of the sleeve 3b and the vertical rod 3c is connected to the cross bar 3d, and the other is connected to the osteotomy guide plate 3a. Thus, by using the telescopic movement between the sleeve 3b and the vertical rod 3c, the height of the osteotomy guide plate 3a relative to the clamping portion 3e in the vertical direction can be adjusted. Since the clamping portion 3e is clamped and fixed at the ankle joint B2, the osteotomy guide plate 3a can move up and down relative to the joint surface B1 of the tibia B under the adjustment of the lifting assembly to meet the osteotomy requirement.

[0084] It should be particularly noted that since the measuring member 1 can be connected to the osteotomy guide plate 3a through the fixing assembly 2, when the lifting assembly adjusts the up and down movement of the osteotomy guide plate 3a, the measuring member 1 will move up and down together, and then the height of the measuring member 1 can be adjusted. Since the measuring member 1 can move back and forth or rotate horizontally relative to the fixing assembly 2 relative to the tibia B, the measuring member 1 can finally be adjusted to contact the lowest point A1 of the posterior condyle A of the femur, so as to use the posterior condyle A of the femur as a reference standard for measuring the osteotomy position.

[0085] In some embodiments, the lifting assembly is slidably connected to the cross bar 3d. Thus, when the lifting assembly moves along the cross bar 3d, the distance between the osteotomy guide plate 3a and the tibia can be adjusted, and finally the end face of the osteotomy groove 3a1 of the osteotomy guide plate 3a on the side for the osteotomy tool to pass through is basically in contact with the bone surface at the osteotomy position, so as to improve the stability during osteotomy operation.

[0086] As shown in Figure 2As shown, when performing tibial osteotomy using the tibial osteotomy device of the present invention, first flex the knee joint by 90 degrees, so that the articular surface B1 of the tibia B is opposite to the posterior femoral condyle A. By adjusting the position of the osteotomy guide plate 3a, the connecting seat 2b drives the measuring member 1 to move together, and by adjusting the rotation or forward and backward movement of the measuring member 1 relative to the connecting seat 2b, finally make the flat part 1b of the measuring member 1 abut against the lowest point A1 of the posterior femoral condyle A. According to the tightness of the measuring member 1 in the flexion gap of the knee joint, judge the wear amount of the articular surface B1 of the tibia B, and replace the measuring member 1 with an appropriate thickness of the flat part 1b so that the flat part 1b just fills the flexion gap of the knee joint. Continue to finely adjust the height of the osteotomy guide plate 3a. When the flat part 1b of the measuring member 1 abuts against the lowest point A1 of the posterior femoral condyle A and the tightness of the measuring member 1 in the flexion gap of the knee joint is moderate, it means that the accurate osteotomy position has been found. This is because after the measuring member 1 is connected to the osteotomy guide plate 3a through the connecting seat 2b, the relative position between the flat part 1b of the measuring member 1 and the osteotomy groove 3a1 of the osteotomy guide plate 3a is fixed, which just corresponds to the osteotomy amount of the supporting prosthesis. Therefore, the position where the osteotomy groove 3a1 is located is adapted to the osteotomy position determined by the measuring member 1. At this time, remove the connecting seat 2b and the measuring member 1, and use an osteotomy tool to perform osteotomy on the tibia along the osteotomy groove 3a1 of the osteotomy guide plate 3a. Since in this tibial osteotomy device, the measurement of the osteotomy position takes the lowest point A1 of the posterior femoral condyle A as the reference point, and the posterior femoral condyle A usually does not show wear, therefore, the osteotomy position of this tibial osteotomy device is relatively accurate and will not be affected by the wear of the articular surface B1 of the tibia B on the osteotomy position accuracy.

[0087] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0088] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A tibial osteotomy device, characterized in that, comprising: an osteotomy assembly including an osteotomy guide plate and a mounting bracket connected to each other, the osteotomy guide plate having an osteotomy groove, and the mounting bracket being used for fixing to the lower limb of a patient and being capable of telescoping; a fixing assembly detachably connected to the osteotomy guide plate; and a measuring member movably connected to the fixing assembly, the measuring member including a straight portion, a first bending portion and a second bending portion, the straight portion being in a flat plate shape, the first bending portion and the second bending portion being respectively connected to opposite ends of the straight portion and bending towards the same side relative to the straight portion, when the tibial osteotomy device is fixed to the tibia, the measuring member can move relative to the fixing assembly to abut against the posterior condyle of the femur.

2. The tibial osteotomy device according to claim 1, characterized in that, the value range of the radius of curvature of the first bending portion and / or the second bending portion is 10 mm to 25 mm.

3. The tibial osteotomy device according to claim 1, characterized in that, the value range of the thickness of the straight portion of the measuring member is 1 mm to 5 mm, and / or, the value range of the length of the straight portion of the measuring member is 1 mm to 5 mm.

4. The tibial osteotomy device according to claim 1, characterized in that, the fixing assembly includes a guide member and a connecting seat connected to each other, the measuring member is movably connected to the guide member, and the connecting seat is detachably connected to the osteotomy guide plate.

5. The tibial osteotomy device according to claim 4, characterized in that, the measuring member includes a connecting portion located at an end of the second bending portion away from the straight portion, a strip-shaped groove is formed in the connecting portion, the guide member is movably inserted through the strip-shaped groove, and the connecting portion is vertically limited to the connecting seat.

6. The tibial osteotomy device according to claim 5, characterized in that, the connecting portion is in a strip shape or a rod shape, and the extending direction of the connecting portion is parallel to the extending direction of the straight portion.

7. The tibial osteotomy device according to claim 6, characterized in that, a guiding inlet is formed in the connecting portion, the guiding inlet is communicated with the strip-shaped groove, the size of the guiding inlet is larger than the width of the strip-shaped groove, an edge is provided at an end of the guide member, and the size of the edge is larger than the width of the strip-shaped groove and smaller than the size of the guiding inlet.

8. The tibial osteotomy device according to claim 7, characterized in that, the edge of the guide member is connected to the main body of the guide member by a thread.

9. The tibial osteotomy device according to claim 4, characterized in that, the connecting seat is provided with a fixing arm for plugging and fixing to the osteotomy guide plate.

10. The tibial osteotomy device according to claim 9, characterized in that, the fixing assembly further includes a pressing member and an adjusting member, the pressing member is movably connected to the connecting seat and is arranged opposite to the fixing arm, when the adjusting member is adjusted, the pressing member can move relative to the fixing arm to clamp or release the osteotomy guide plate.

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