Distal femoral osteotomy positioning device

Abstract

The present invention relates to a distal femoral osteotomy positioning device, comprising a positioning block, a spacer, and an osteotomy guide. The positioning block has a first positioning surface, the first positioning surface being used to contact the tibial osteotomy surface so that the positioning block is positioned on the tibia; the spacer has a second positioning surface opposite to the first positioning surface, the second positioning surface being used to contact the distal articular surface of the femur, and an angle is formed between the first positioning surface and the second positioning surface; the osteotomy guide has an osteotomy groove. The distal femoral osteotomy positioning device of the present invention can maintain a posterior tilt angle of 3° to 7° during tibial osteotomy so that the tibial plateau conforms to the physiological morphology of the knee joint, while reducing the situation in which the distal femoral osteotomy thickness varies due to inconsistent insertion depth of the positioning block into the knee joint, thereby maintaining the accuracy of osteotomy positioning.

Description

Technical Field

[0001] The present invention relates to the technical field of orthopedic surgery auxiliary instruments, and in particular to a distal femoral osteotomy positioning device. Background Art

[0002] The knee joint is mainly composed of the tibia, femur and patella. Physiologically, the tibial plateau has a posterior tilt angle of 3° to 7° with the ground. The principle of unicompartmental knee replacement is to restore the surgeon's knee joint shape before osteotomy and to restore the lower limb force line to the state of a healthy knee joint. In addition, the principle of knee osteotomy is to fill as much as cut, so the tibial osteotomy has a posterior tilt angle of 3° to 7°. Usually, the tibial osteotomy surface is used as the reference plane for distal femoral osteotomy. At the same time, because the prosthesis is designed so that the distal femoral osteotomy surface is parallel to the ground (horizontal plane), there is an angle of 3° to 7° between the distal femoral osteotomy surface and the tibial osteotomy surface.

[0003] However, during the osteotomy process of the traditional unicompartmental knee joint, the depth of the positioning tool inserted into the knee joint is inconsistent, resulting in inconsistent thickness of the distal femoral osteotomy, affecting the accuracy of the osteotomy position and making it difficult to ensure that the osteotomy thickness is consistent with the prosthesis thickness. Summary of the Invention

[0004] Based on this, a distal femoral osteotomy positioning device is provided to solve the problem of how to improve the accuracy of osteotomy positioning.

[0005] The present invention provides a distal femoral osteotomy positioning device, comprising:

[0006] A positioning block having a first positioning surface, wherein the first positioning surface is used to contact the tibial osteotomy surface so that the positioning block is positioned on the tibia;

[0007] a spacer block, arranged between the positioning block and the femur, the spacer block having a second positioning surface opposite to the first positioning surface, the second positioning surface being configured to contact the distal articular surface of the femur, and the first positioning surface and the second positioning surface forming an angle; and

[0008] The osteotomy guide is connected to the positioning block, and the osteotomy guide has an osteotomy groove.

[0009] The above-mentioned distal femoral osteotomy positioning device has a padding block between the positioning block and the femur, and an angle is formed between the first positioning surface of the positioning block and the second positioning surface of the padding block to compensate for the 3° to 7° posterior tilt angle of the tibial osteotomy surface. When the osteotomy groove of the osteotomy guide is used to guide the osteotomy tool to perform femoral osteotomy, the direction of the osteotomy tool performing horizontal osteotomy on the femur is basically parallel to the second positioning surface, so that when the depth of insertion into the knee joint is different, the thickness of the femoral osteotomy remains unchanged, that is, the accuracy of osteotomy positioning is maintained. Therefore, using the distal femoral osteotomy positioning device of the present application, it is possible to maintain a 3° to 7° posterior tilt angle during tibial osteotomy so that the tibial plateau conforms to the physiological morphology of the knee joint, while reducing the situation where the thickness of the distal femoral osteotomy is inconsistent due to the inconsistent depth of the positioning block inserted into the knee joint.

[0010] In one embodiment, the angle between the first positioning surface and the second positioning surface is 3° to 7°.

[0011] In one embodiment, the cushion block and the positioning block are integrally formed.

[0012] In one embodiment, the osteotomy groove is parallel to the second positioning surface.

[0013] In one embodiment, one of the cushion block and the positioning block is provided with a positioning groove, and the other one is provided with a positioning pin, and the positioning pin cooperates with the positioning groove.

[0014] In one embodiment, the number of the positioning grooves is 2 or more, the number of the positioning pins is 2 or more, and when the cushion block is connected to the positioning block, the positioning pins correspond one-to-one to the positioning grooves.

[0015] In one embodiment, the end surface of the positioning pin is inclined relative to the axis of the positioning pin.

[0016] In one embodiment, the positioning block has a top surface opposite to the first positioning surface, and the top surface and the first positioning surface are parallel to each other.

[0017] In one embodiment, the thickness of the spacer gradually decreases in a direction approaching the osteotomy guide.

[0018] In one embodiment, the positioning block is connected to a plug-in portion, and the osteotomy guide has a slot, which is parallel to the osteotomy groove and cooperates with the plug-in portion.

[0019] In one embodiment, the extending direction of the plug-in portion is parallel to the second positioning surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0021] Figure 1 A three-dimensional diagram of a distal femoral osteotomy positioning device according to an embodiment;

[0022] Figure 2 This is a schematic diagram of the exploded structure of the positioning block and the spacer block of the distal femoral osteotomy positioning device according to one embodiment;

[0023] Figure 3 A schematic side view of the structure of a distal femoral osteotomy positioning device according to an embodiment;

[0024] Figure 4 This is a schematic structural diagram of a distal femoral osteotomy positioning device according to an embodiment when inserted into a knee joint to a certain depth;

[0025] Figure 5 This is a schematic structural diagram of a distal femoral osteotomy positioning device according to an embodiment when inserted into a knee joint at another depth. DETAILED DESCRIPTION

[0026] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive disclosure of the present invention.

[0027] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0028] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0030] Combine Figures 1 to 3 As shown, the present invention provides a distal femoral osteotomy positioning device 10 , comprising a positioning block 11 , a spacer block 12 and an osteotomy guide 13 .

[0031] The positioning block 11 has a first positioning surface 11a, and the spacer 12 is used to be placed between the positioning block 11 and the femur. The spacer 12 has a second positioning surface 12a opposite to the first positioning surface 11a. The osteotomy guide 13 is connected to the positioning block 11 and has an osteotomy groove 13a for the osteotomy tool 20 to pass through.

[0032] Combine Figure 4 and Figure 5 As shown, the first positioning surface 11a is designed to contact the tibial osteotomy surface B1, positioning the positioning block 11 on the tibia B. The second positioning surface 12a is designed to contact the distal articular surface of the femur A. The positioning block 11 and the spacer 12 thereby position the femur A at a predetermined height relative to the tibial osteotomy surface B1, facilitating subsequent osteotomy of the femur A using the osteotomy guide 13. When the osteotomy guide 13 is positioned relative to the femur A, the osteotomy groove 13a guides the osteotomy tool 20 horizontally as it performs osteotomy on the femur A.

[0033] See Figure 3 As shown, the first positioning surface 11a and the second positioning surface 12a form an angle α, thereby offsetting the posterior tilt angle β of the tibial osteotomy surface B1 (as shown in FIG. Figure 5 The angle β) formed between the tibial osteotomy surface B1 and the horizontal plane is shown so that the second positioning surface 12a is as horizontal as possible, so as to facilitate the accuracy of the subsequent osteotomy position.

[0034] Furthermore, the angle α has a value range of 3° to 7°, and the angle between the first positioning surface 11a and the second positioning surface 12a is 3° to 7°, such as 3°, 5° or 7°. This can better offset the tilt angle β of the tibial osteotomy surface B1. Specifically, the physiological tibial plateau of the human body has a tilt angle of 3° to 7° with the ground. After the tibial osteotomy is completed, the tilt angle β of the tibial osteotomy surface B1 is 3° to 7°, so as to improve the functional repair effect of the knee joint. Since the angle α between the second positioning surface 12a and the first positioning surface 11a is 3° to 7°, this angle is consistent with the tilt angle β of the tibial osteotomy surface B1, so that the second positioning surface 12a is as close to horizontal as possible. Combined with Figure 3 As shown, when the osteotomy groove 13a guides the osteotomy tool 20 to perform osteotomy on the femur A in the horizontal direction, the osteotomy tool 20 and the second positioning surface 12a are maintained as parallel as possible.

[0035] Combine Figure 4 and Figure 5 As shown, since the second positioning surface 12a is as close to horizontal as possible, and the osteotomy groove 13a can guide the osteotomy tool 20 to perform osteotomy on the femur A in the horizontal direction, even if the insertion depth of the positioning block 11 and the spacer 12 into the knee joint between the tibia B and the femur A is different (for example, the insertion depth is different from the insertion depth of the positioning block 11 and the spacer 12). Figure 4 The S shown is adjusted to Figure 5 As shown in S'), the distance between the distal articular surface of the femur A and the axis of the osteotomy groove 13a is fixed (i.e., d is equal to d') under the positioning of the second positioning surface 12a. Then, the osteotomy tool 20 keeps the amount of osteotomy of the femur A unchanged under the guidance of the osteotomy groove 13a, thereby achieving the effect of maintaining the accuracy of osteotomy positioning.

[0036] In summary, by using the distal femoral osteotomy positioning device 10 of the present application, it is possible to maintain a posterior tilt angle β of 3° to 7° when osteotomizing the tibia B so that the tibial plateau conforms to the physiological morphology of the knee joint, while reducing the situation where the thickness of the distal femoral osteotomy amount is uneven due to the inconsistent depth of the positioning block 11 inserted into the knee joint.

[0037] Furthermore, the osteotomy groove 13a is parallel to the second positioning surface 12a, so that when the osteotomy tool 20 is used to guide the osteotomy groove 13a to perform osteotomy on the femur A in the horizontal direction, the osteotomy tool 20 is parallel to the second positioning surface 12a. At this time, the depth of the positioning block 11 and the pad 12 inserted into the knee joint will not affect the amount of osteotomy of the femur A by the osteotomy tool 20.

[0038] In some embodiments, as Figure 4 and Figure 5As shown, when the first positioning surface 11a contacts the tibial osteotomy surface B1, the second positioning surface 12a lies on a horizontal plane. Because the osteotomy tool 20, inserted into the osteotomy groove 13a, osteotomizes the femur A horizontally, the distance between the osteotomy tool 20 and the first positioning surface 11a remains constant, regardless of the depth of insertion of the positioning block 11 and the spacer 12 into the knee joint. This ensures the accuracy of the osteotomy position.

[0039] It should be noted that, although the positioning block 11 and the spacer block 12 are described separately in the distal femoral osteotomy positioning device 10, this does not limit them to being separate structural components. For example, in some embodiments, the positioning block 11 and the spacer block 12 are integrally formed. Specifically, the spacer block 12 is integrally formed with the positioning block 11. In this case, the angle between the first positioning surface 11a and the second positioning surface 12a can still offset the posterior tilt angle β of the tibial osteotomy surface B1.

[0040] In other embodiments, the positioning block 11 and the spacer 12 are two separable structural members that are detachably connected by screws or magnets. When the positioning block 11 and the spacer 12 are detachably connected, spacers 12 of different sizes can be flexibly matched to the positioning block 11 to accommodate the need to adjust the amount of osteotomy.

[0041] In some embodiments, the positioning block 11 and the cushion block 12 are aligned with each other through a positioning structure. Figure 2 As shown, the positioning block 11 is provided with a positioning groove 11c, and the pad 12 is provided with a positioning pin 12c. The positioning pin 12c cooperates with the positioning groove 11c, so that the pad 12 is stably placed on the positioning block 11 and will not easily slip off the positioning block 11, so as to maintain the positioning stability between the femur A and the tibia B after the pad 12 and the positioning block 11 are inserted into the knee joint.

[0042] It should be noted that in other embodiments, the positioning slots 11c and the positioning pins 12c may be interchanged in the spacer 12 and the positioning block 11. Specifically, the positioning pins are provided on the positioning block 11, and the positioning slots are provided on the spacer 12. The positioning pins cooperate with the positioning slots, which can also ensure a stable fit between the spacer 12 and the positioning block 11 and reduce the chance of the spacer 12 slipping off the positioning block 11.

[0043] There is no limitation on the location of the positioning groove 11c and the positioning pin 12c. As long as one of the pad 12 and the positioning block 11 is provided with a positioning groove 11c, and the other is provided with a positioning pin 12c, the positioning pin 12c cooperates with the positioning groove 11c to stably cushion the pad 12 on the positioning block 11. For example, in some embodiments, the pad 12 is provided with not only a positioning groove 11c but also a positioning pin. The positioning block 11 is provided with a positioning pin corresponding to the positioning groove on the pad 12, and the positioning block 11 is provided with a positioning groove 11c that corresponds to the positioning pin 12c on the pad 12. Thus, by utilizing the corresponding positioning grooves 11c and positioning pins 12c on the pad 12 and the positioning block 11, a stable cooperation between the pad 12 and the positioning block 11 can be achieved, thereby improving the overall positioning stability of the distal femoral osteotomy positioning device 10, so as to facilitate the stability of the subsequent osteotomy of the femur A.

[0044] Furthermore, the number of positioning grooves 11c is two or more, and the number of positioning pins 12c is two or more. When the spacer 12 is connected to the positioning block 11, the positioning pins 12c correspond one-to-one with the positioning grooves 11c. The combination of a large number of positioning grooves 11c and positioning pins 12c can enhance the mating stability between the spacer 12 and the positioning block 11. The number of positioning grooves 11c and positioning pins 12c is not limited herein.

[0045] The end face of the positioning pin 12c is inclined relative to the axis of the positioning pin 12c, so that even if the positioning block 11 is inserted into the knee joint, the inclined end face of the positioning pin 12c can be used to guide the pad 12 to fit into the positioning block 11. Through this structure, the appropriate pad 12 can be flexibly replaced.

[0046] Combine Figure 2 and Figure 3 As shown, the positioning block 11 has a top surface 11b opposite to the first positioning surface 11a, and the top surface 11b and the first positioning surface 11a are parallel to each other. The thickness of this positioning block 11 is uniform, so when processing positioning blocks 11 of different specifications, they can be divided into standard parts by thickness, simplifying the processing difficulty.

[0047] In this embodiment, the thickness of the spacer 12 gradually decreases in the direction approaching the osteotomy guide 13. Specifically, the second positioning surface 12a and the bottom surface 12b (the surface of the spacer 12 facing away from the second positioning surface 12a) are arranged at an angle. It is understood that the angle is set at 3° to 7°. When the spacer 12 is matched with the positioning block 11, the angle between the second positioning surface 12a and the bottom surface 12b offsets the posterior tilt angle β of the tibial osteotomy surface B1, making the second positioning surface 12a of the spacer 12 as horizontal as possible, reducing the influence of the depth of insertion of the positioning block 11 and the spacer 12 into the knee joint on the osteotomy position, thereby improving the accuracy of the osteotomy position when the osteotomy guide 13 guides the osteotomy tool 20 to perform horizontal osteotomy on the femur A.

[0048] The positioning block 11 is connected to a plug-in portion 111, and the osteotomy guide 13 has a slot 13b that mates with the plug-in portion 111, thereby mating the osteotomy guide 13 with the positioning block 11. At this point, the osteotomy groove 13a of the osteotomy guide 13 is positioned relative to the positioning block 11. When the positioning block 11 and the spacer 12 are inserted into the knee joint to position the femur A, the osteotomy groove 13a is positioned relative to the femur A, thereby guiding the osteotomy tool 20 to perform osteotomy on the femur A.

[0049] The slot 13 b is parallel to the osteotomy groove 13 a so that when machining the osteotomy guide 13 , the machining tool does not need to be reversed, thereby ensuring machining consistency between the slot 13 b and the osteotomy groove 13 a and maintaining machining accuracy of the osteotomy guide 13 .

[0050] Furthermore, the extension direction of the plug-in portion 111 is parallel to the second positioning surface 12a, so that when the plug-in portion 111 is matched with the slot 13b, the osteotomy groove 13a parallel to the slot 13b can guide the osteotomy tool 20 to perform osteotomy on the femur A along a direction parallel to the second positioning surface 12a, and will not be affected by the depth of the positioning block 11 and the pad block 12 inserted into the knee joint, thereby improving the osteotomy accuracy.

[0051] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A distal femoral osteotomy positioning device, characterized in that: include: A positioning block having a first positioning surface, wherein the first positioning surface is used to contact the tibial osteotomy surface so that the positioning block is positioned on the tibia; a spacer block, arranged between the positioning block and the femur, the spacer block having a second positioning surface opposite to the first positioning surface, the second positioning surface being configured to contact the distal articular surface of the femur, and the first positioning surface and the second positioning surface forming an angle; and an osteotomy guide connected to the positioning block, wherein the osteotomy guide has an osteotomy groove; One of the pad and the positioning block is provided with a positioning groove, and the other is provided with a positioning pin. The positioning pin cooperates with the positioning groove, and the end face of the positioning pin is inclined relative to the axis of the positioning pin. In the direction approaching the osteotomy guide, the thickness of the pad gradually decreases.

2. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The angle formed between the first positioning surface and the second positioning surface is 3° to 7°.

3. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The cushion block has a bottom surface, the bottom surface faces away from the second positioning surface, the second positioning surface and the bottom surface are arranged at an angle, and the angle between the two is 3° to 7°.

4. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The osteotomy groove is parallel to the second positioning surface.

5. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The positioning block and the cushion block are detachably connected via screws.

6. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The number of the positioning grooves is more than 2, and the number of the positioning pins is more than 2. When the cushion block is connected to the positioning block, the positioning pins correspond to the positioning grooves one by one.

7. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The positioning block and the cushion block are detachably connected via magnetic attraction.

8. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The positioning block has a top surface opposite to the first positioning surface, and the top surface and the first positioning surface are parallel to each other.

9. The distal femoral osteotomy positioning device according to claim 1, characterized in that: The positioning block is connected with an inserting portion, and the osteotomy guide has a slot, which is parallel to the osteotomy groove and matched with the inserting portion.

10. The distal femoral osteotomy positioning device according to claim 9, characterized in that: An extending direction of the plug-in portion is parallel to the second positioning surface.

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