Knee joint ectropion osteotomy guide plate

Abstract

The utility model discloses a knee joint ectropion osteotomy guide plate which comprises an osteotomy template, and the inner surface of the osteotomy template is in a cambered surface shape matched with the surface of the thighbone of a human body. A fixing hole is formed in the osteotomy template, a kirschner wire penetrates through the fixing hole to connect and fix the osteotomy template and the femur together, a plurality of first tubular columns arranged side by side and second tubular columns arranged side by side are arranged on the osteotomy template, the first tubular columns are transversely arranged in the width direction of the femur, and the second tubular columns are transversely arranged in the width direction of the femur. The second tubular columns are also transversely arranged in the width direction of the thighbone, first hole channels are formed in the first tubular columns, second hole channels are formed in the second tubular columns, and the included angle between the central axis of each first hole channel and the central axis of each second hole channel is an acute angle. After two rows of Kirschner wires for fixing an osteotomy surface are driven into the osteotomy template, the osteotomy position, the osteotomy angle and the osteotomy depth cannot be lost after the osteotomy template and the Kirschner wires are removed, and the osteotomy precision in the joint is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a valgus osteotomy guide plate for knee joints. Background Art

[0002] Knee valgus is a common disease in orthopedics, often secondary to destructive diseases such as rickets, poliomyelitis, trauma and infection, resulting in maldevelopment of the femur or tibia, changing the lower limb force line, leading to uneven lengths of the two lower limbs, and thus causing pain in the affected limb, abnormal gait and appearance. Knee valgus deformity can be treated by different methods according to the patient's age, deformity condition, etc. Severe knee varus and valgus deformity patients need surgical osteotomy and orthosis. Currently, the commonly used osteotomy methods include: medial closed osteotomy of the distal femur, lateral open osteotomy of the distal femur, medial open osteotomy of the proximal tibia, lateral closed osteotomy of the proximal tibia, etc.

[0003] The accuracy of osteotomy with traditional osteotomy instruments depends on the experience of the surgeon and virtual measurement of preoperative imaging. When fluoroscopy finds that the force line correction is insufficient, additional osteotomy amount needs to be increased again, which easily leads to excessive osteotomy amount and instead increases the risk of overcorrection; in addition, after accurately determining the osteotomy position through the osteotomy groove in the prior art, a wedge-shaped bone block is intercepted by a saw blade. However, during the use of the saw blade, the femur is prone to overheating, which in turn leads to osteonecrosis. Content of the Utility Model

[0004] The purpose of the utility model is to improve and innovate in view of the disadvantages and problems in the background art, and provide a valgus osteotomy guide plate for knee joints.

[0005] A valgus osteotomy guide plate for knee joints includes an osteotomy template, and the inner surface of the osteotomy template is in an arc shape adapted to the surface of the human femur; fixing holes are formed on the osteotomy template, and Kirschner wires pass through the fixing holes to connect and fix the osteotomy template to the femur. There are multiple first tube columns arranged side by side and multiple second tube columns arranged side by side on the osteotomy template, and the multiple first tube columns are horizontally arranged along the width direction of the femur, and the multiple second tube columns are also horizontally arranged along the width direction of the femur. A first hole is formed on the first tube column, a second hole is formed on the second tube column, and the central axis of the first hole forms an acute angle with the central axis of the second hole.

[0006] Further, the osteotomy template, the first tube column and the second tube column are prepared by 3D printing.

[0007] Further, the number of the fixing holes is set to two.

[0008] Further, the number of the first tube columns is set to four.

[0009] A further solution is that the number of the second pipe columns is set to be four.

[0010] A further solution is that when the osteotomy template is fixed on the human femur, the height of one end of the first hole near the osteotomy template is lower than that of the other end of the first hole far from the osteotomy template; the height of one end of the second hole near the osteotomy template is higher than that of the other end of the second hole far from the osteotomy template.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: the 3D printing personalized osteotomy guide plate of the present utility model can greatly improve the surgical precision. The inner surface of the osteotomy template is in an arc shape adapted to the surface of the human femur. The Kirschner wire passes through the fixing hole, which is convenient for connecting and fixing the osteotomy template and the femur together, accurately positioning the osteotomy site, and accurately osteotomizing can better restore the lower limb force line and correct the imbalance of the soft tissues on the inner and outer sides of the knee joint, restoring the normal function of the joint; after driving in the Kirschner wires for fixing the osteotomy surface in two rows, removing the osteotomy template and the Kirschner wires will not cause the loss of the osteotomy position, osteotomy angle and osteotomy depth, realizing the precision of intra-articular osteotomy; after determining the osteotomy surface through two rows of Kirschner wires, using an osteotome to strike the osteotomy surface of the Kirschner wire to separate the osteotomy block, compared with cutting a wedge-shaped bone block by a saw blade, it will not cause bone necrosis due to overheating; in addition, the first pipe column and the second pipe column play a guiding role to ensure that the Kirschner wire will not deviate during the implantation process through the first hole and the second hole; the included angle between the central axis of the first hole and the central axis of the second hole is an acute angle, so that the internal dimension of the intercepted bone block is smaller than the external dimension, which is beneficial to reducing the surgical trauma and facilitating the placement of the implant. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 It is a front three-dimensional structural schematic diagram of a knee valgus osteotomy guide plate provided by an embodiment of the present invention;

[0014] Figure 2 It is a back three-dimensional structural schematic diagram of a knee valgus osteotomy guide plate provided by an embodiment of the present invention;

[0015] Reference numerals: osteotomy template 1, fixing hole 2, first pipe column 3, second pipe column 4, first hole 5, second hole 6. Detailed Embodiments

[0016] In order to make the objectives, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can 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.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific implementation manners and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0019] Please refer to Figure 1 - Figure 2 , the present utility model provides a valgus osteotomy guide plate for the knee joint, including an osteotomy template 1. The inner surface of the osteotomy template 1 is in an arc shape adapted to the surface of the human femur, which facilitates the osteotomy template 1 to be attached to the bone surface of the human femur. Two fixing holes 2 are provided on the osteotomy template 1, and Kirschner wires pass through the fixing holes 2 to connect and fix the osteotomy template 1 to the femur.

[0020] There are multiple first tube columns 3 arranged side by side and multiple second tube columns 4 arranged side by side on the osteotomy template 1. Moreover, the multiple first tube columns 3 are horizontally arranged along the width direction of the femur, and the multiple second tube columns 4 are also horizontally arranged along the width direction of the femur. A first hole 5 is provided on the first tube column 3, and a second hole 6 is provided on the second tube column 4. When the osteotomy template 1 is fixed to the human femur, Kirschner wires are successively drilled into the first hole 5 and the second hole 6 to position the osteotomy surface, and at the same time, accurately position the osteotomy angle and the osteotomy depth; moreover, after removing the osteotomy template 1 and the Kirschner wires, the osteotomy position, the osteotomy angle and the osteotomy depth will not be lost, realizing the precision of intra-articular osteotomy.

[0021] The included angle between the central axis of the first hole 5 and the central axis of the second hole 6 is an acute angle. Specifically, when the osteotomy template 1 is fixed to the human femur, the height of the first hole 5 at the end close to the osteotomy template 1 is lower than the height of the first hole 5 at the end far from the osteotomy template 1; the height of the second hole 6 at the end close to the osteotomy template 1 is higher than the height of the second hole 6 at the end far from the osteotomy template 1. Such a setting can make the internal size of the intercepted bone block smaller than the external size, which is beneficial to reducing surgical trauma and facilitating the placement of implants.

[0022] The osteotomy template 1, the first tube column 3, and the second tube column 4 are prepared by 3D printing. Specifically, before the operation, the angle of deformity can be accurately measured through digital orthopedics technology, a tibial bone model can be established, the osteotomy site and angle can be simulated on a computer, the osteotomy site, osteotomy depth, and correction angle can be accurately positioned, the osteotomy guide plate 1, the first tube column 3, and the second tube column 4 can be designed and 3D printed, realizing the precision of intra-articular osteotomy.

[0023] Preferably, the number of the first tube columns 3 is set to four; the number of the second tube columns 4 is also set to four.

[0024] The working principle of the present utility model: During actual use, a medial approach to the distal thigh is taken during the operation, the skin and deep fascia are incised, the space between the vastus medialis and the adductor magnus is bluntly dissected, and the distal femur and the medial femoral condyle are exposed. The posterior femoral muscle group is bluntly dissected, and a muscle baffle is inserted. During the operation, the medial femoral condyle part is fully exposed. The 3D printed osteotomy template 1 is slid on the medial femoral condyle until the template is at the most fitting position on the femur or at the position with the lowest potential energy and the most stability. Then, a Kirschner wire for fixing the osteotomy template 1 is drilled, and then Kirschner wires are successively drilled into the femur through the first hole 5 and the second hole 6, leaving about 1 cm of hinge to avoid completely cutting off the bone on the opposite side, retaining the bone cortex on the opposite side. Then, the Kirschner wires and the osteotomy template 1 are removed, and an osteotome is used to strike the osteotomy surface of the Kirschner wire to separate the osteotomy block. The supporting osteotomy steel plate is placed in the appropriate position, holes are drilled and the depth is measured in sequence, and appropriate screws are screwed in. The wedge-shaped bone block is trimmed into bone particles, and bone grafting is performed on the posterior side of the femur.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 utility model.

[0026] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0027] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The mention of "embodiments" in this text means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0028] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A knee valgus osteotomy guide, characterized in that: The osteotomy template (1) comprises an inner surface of which is in an arc shape adapted to the surface of a human femur; a fixing hole (2) is provided on the osteotomy template (1), and a Kirschner wire is passed through the fixing hole (2) to connect and fix the osteotomy template (1) to the femur; a plurality of first tube columns (3) and a second tube column (4) are arranged side by side on the osteotomy template (1), and the plurality of first tube columns (3) are arranged transversely along the width direction of the femur, and the plurality of second tube columns (4) are also arranged transversely along the width direction of the femur; a first channel (5) is provided on the first tube column (3), and a second channel (6) is provided on the second tube column (4), and the included angle between the central axis of the first channel (5) and the central axis of the second channel (6) is an acute angle.

2. The knee valgus osteotomy guide according to claim 1, characterized in that: The osteotomy template (1), the first tubular column (3) and the second tubular column (4) are prepared by 3D printing.

3. The knee valgus osteotomy guide according to claim 1, characterized in that: The number of the fixing holes (2) is two.

4. The knee valgus osteotomy guide according to claim 1, characterized in that: The number of the first pipe columns (3) is four.

5. The knee valgus osteotomy guide according to claim 1, characterized in that: The number of the second pipe columns (4) is four.

6. The knee valgus osteotomy guide according to claim 1, characterized in that: When the osteotomy template (1) is fixed on a human femur, the height of the first channel (5) close to one end of the osteotomy template (1) is lower than the height of the first channel (5) away from one end of the osteotomy template (1); and the height of the second channel (6) close to one end of the osteotomy template (1) is higher than the height of the second channel (6) away from one end of the osteotomy template (1).

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