Gap measurer and femoral extramedullary positioning osteotomy device

Abstract

The utility model discloses a gap measurer and a femoral extramedullary positioning osteotomy device.The gap measurer is used for being connected with a femoral osteotomy block and comprises at least one measuring part, and the measuring part is used for being inserted between a tibia and a medial condyle of a femur so as to measure the distance between the tibia and the medial condyle; the measuring part is used for being inserted between the tibia and the lateral condyle of the femur to measure the distance between the tibia and the lateral condyle; the measuring part comprises two first measuring faces distributed in the first direction, the two first measuring faces are used for making contact with the medial condyle and the lateral condyle in a one-to-one correspondence mode, and the first measuring faces are inwards-concave faces so that the first measuring faces on the two sides of the measuring part can be more matched with the appearance of the medial condyle and the appearance of the lateral condyle of the thighbone. The evaluation accuracy of the straightening or buckling gap between the medial condyle and the lateral condyle of the thighbone of the patient and the tibia is improved, and then the operation quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a gap measuring device and a femoral extramedullary positioning osteotomy device. BACKGROUND

[0002] Femoral distal and posterior condylar osteotomy is a crucial step in total knee arthroplasty, and the femoral extramedullary positioning osteotomy device is a necessary instrument for femoral osteotomy. After the doctor performs tibial osteotomy and femoral osteotomy on the patient, the gap measuring device of the femoral extramedullary positioning osteotomy device is usually used to evaluate whether the patient's extension or flexion gap is restored to normal.

[0003] However, the gap measuring device of the existing femoral extramedullary positioning osteotomy device is not accurate enough in evaluating the patient's extension or flexion gap, which can easily affect the quality of the operation. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a gap measuring device and a femoral extramedullary positioning osteotomy device, which aims to solve the problem that the gap measuring device of the existing femoral extramedullary positioning osteotomy device is not accurate enough in evaluating the patient's extension or flexion gap, which can easily affect the quality of the operation.

[0005] The embodiments of the present application provide a gap measuring device for connecting with a femoral osteotomy block, the gap measuring device comprising at least one measuring portion, the measuring portion being used for inserting between a tibia and an inner condyle of a femur to measure the distance between the tibia and the inner condyle, and the measuring portion being used for inserting between the tibia and an outer condyle of the femur to measure the distance between the tibia and the outer condyle.

[0006] The measuring portion comprises two first measuring surfaces distributed along a first direction, the two first measuring surfaces being used for one-to-one corresponding contact with the inner condyle and the outer condyle, and the first measuring surface being a concave surface.

[0007] In some embodiments, the measuring portion comprises a second measuring surface, and the second measuring surface is located on a side of the measuring portion away from the first measuring surface.

[0008] The second measuring surface is a plane, and the plane is used for contact with a cut plane of the tibia; or

[0009] The second measuring surface is a concave surface, and the second measuring surface is used for contact with the tibia.

[0010] In some embodiments, the two first measuring surfaces respectively have a nearest point closest to the plane, and the distance m of the two nearest points in the first direction is greater than or equal to 25 mm and less than or equal to 75 mm.

[0011] In some embodiments, each of the first measurement surfaces has a nearest point closest to the plane, and one of the nearest points is farther from the plane than the other nearest point; the first measurement surface on which the nearest point farther from the plane is used to contact the medial condyle, and the first measurement surface on which the nearest point closer to the plane is used to contact the lateral condyle.

[0012] In some embodiments, the first measurement surface comprises opposite first and second edges, and the first edge of the first measurement surface is closer to the other first measurement surface than the second edge.

[0013] The minimum distance n1 of the first edge to the plane is greater than the minimum distance n2 of the second edge to the plane.

[0014] In some embodiments, each of the first measurement surfaces has a nearest point closest to the plane, and the line connecting the two nearest points forms an angle a with the plane, which is greater than or equal to 1° and less than or equal to 9°; preferably, the line connecting the two nearest points forms an angle a with the plane, which is greater than or equal to 3° and less than or equal to 5°.

[0015] In some embodiments, the inner concave surface is a concave curved surface.

[0016] The first measurement surface intersects a plane perpendicular to the second direction to form a first intersection line, and the radius of curvature R1 of the first intersection line of at least one of the first measurement surfaces is greater than or equal to 10 mm, the first direction, the second direction and the thickness direction of the measurement portion are substantially perpendicular to each other; and / or,

[0017] The first measurement surface intersects a plane perpendicular to the first direction to form a second intersection line, and the radius of curvature R2 of the second intersection line of at least one of the first measurement surfaces is greater than or equal to 10 mm.

[0018] In some embodiments, the gap measurement device comprises a connecting portion for connecting with the femoral osteotomy block, and the measurement portion is arranged at both ends of the connecting portion.

[0019] In some embodiments, the connecting portion further comprises a connecting hole for inserting a force line rod.

[0020] The embodiments of the present application also provide a femoral extramedullary positioning osteotomy device, comprising:

[0021] A femoral osteotomy block, the femoral osteotomy block is provided with a femoral osteotomy groove;

[0022] A gap measuring device, the gap measuring device is as described above, the gap measuring device is connected with the femoral osteotomy block, the gap measuring device comprises at least one measuring part, the measuring part is used for being inserted between the tibia and the two femoral condyles to measure the distance between the tibia and the two femoral condyles;

[0023] Wherein, the measuring part comprises two first measuring surfaces distributed along a first direction, the two first measuring surfaces are used for corresponding contact with the two femoral condyles, and the first measuring surface is a concave surface.

[0024] In some embodiments, the femoral osteotomy block is slidably connected with the gap measuring device along a second direction, the second direction is perpendicular to the first direction and the thickness direction of the measuring part of the gap measuring device respectively.

[0025] In some embodiments, the connecting part of the gap measuring device is provided with at least one sliding groove extending along the second direction, and the at least one sliding groove comprises two opposite inner side surfaces;

[0026] The femoral osteotomy block comprises at least one sliding block, the at least one sliding block is correspondingly and slidably installed in the at least one sliding groove, and the sliding block comprises an outer side surface opposite to the inner side surface.

[0027] Wherein, one of the inner side surface and the outer side surface is provided with a limiting groove, and the other of the inner side surface and the outer side surface is provided with a limiting part, and the limiting part is slidably installed in the limiting groove along the second direction.

[0028] The measuring part of the gap measuring device provided by the embodiment of the present application can be inserted between the tibia and the medial condyle and the lateral condyle of the femur, and the first measuring surface corresponding to the medial condyle and the lateral condyle of the femur of the measuring part is a concave surface, which can make the two side first measuring surfaces of the measuring part more adapt to the shape of the medial condyle and the lateral condyle of the femur, and is beneficial to improve the evaluation accuracy of the extension or flexion gap between the medial condyle and the lateral condyle of the femur and the tibia of the patient, and further improve the operation quality. BRIEF DESCRIPTION OF DRAWINGS

[0029] The technical scheme and other beneficial effects of the present application will be apparent through the following detailed description of the specific embodiments of the present application combined with the drawings.

[0030] Figure 1 The structure schematic diagram of one embodiment of the femoral extramedullary positioning osteotomy device, the tibia and the femur provided by the embodiment of the present application;

[0031] Figure 2 The structure schematic diagram of one embodiment of the gap measuring device provided by the embodiment of the present application;

[0032] Figure 3A sectional view of one embodiment of the gap measurer provided by the embodiment of the present application, wherein the sectioning surface is perpendicular to the second direction;

[0033] Figure 4 A sectional view of one embodiment of the gap measurer provided by the embodiment of the present application, wherein the sectioning surface is perpendicular to the first direction;

[0034] Figure 5 A sectional view of one embodiment of the extramedullary positioning osteotomy device for femur provided by the embodiment of the present application, wherein the sectioning surface is perpendicular to the second direction.

[0035] The extramedullary positioning osteotomy device for femur 20; the gap measurer 21; the measuring part 211; the first measuring surface 2111; the first edge 2112; the second edge 2113; the first intersection line 2114; the second intersection line 2115; the second measuring surface 2116; the connecting part 212; the connecting hole 2121; the sliding groove 2122; the inner side surface 2123; the limiting part 2124; the femur osteotomy block 22; the femur osteotomy groove 221; the sliding block 222; the limiting groove 223;

[0036] The femur 300; the medial condyle 310; the lateral condyle 320; the tibia 400; the first direction X; the second direction Y; the thickness direction Z. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] In the description of the present application, 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" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0042] This application provides a gap measuring device and an extramedullary femoral osteotomy positioning device. These will be described in detail below.

[0043] First, this application provides a gap measuring device.

[0044] Figure 1 This is a schematic diagram illustrating the structure of an embodiment of the femoral extramedullary positioning osteotomy device, tibia, and femur provided in this application. Figure 1 As shown, the femoral extramedullary positioning osteotomy device 20 is used to measure the distance between the medial condyle 310 and lateral condyle 320 of the tibia 400 and the femur 300, especially the distance between the cut plane of the tibia 400 and the medial condyle 310 and lateral condyle 320 of the femur 300.

[0045] As shown in Figure 1 and Figure 2 The femoral extramedullary osteotomy device 20 can include a femoral osteotomy block 22 and a gap measurer 21, the femoral osteotomy block 22 is provided with a femoral osteotomy groove 221. The gap measurer 21 is connected with the femoral osteotomy block 22, and is used to measure the distance between the tibia 400 and the medial condyle 310 and the lateral condyle 320 of the femur 300, especially the distance between the cut plane of the tibia 400 and the medial condyle 310 and the lateral condyle 320 of the femur 300.

[0046] In some embodiments, the gap measurer 21 can include at least one measuring part 211, which is used to be inserted between the tibia 400 and the medial condyle 310 of the femur 300 to measure the distance between the tibia 400 and the medial condyle 310, and the measuring part 211 is used to be inserted between the tibia 400 and the lateral condyle 320 of the femur 300 to measure the distance between the tibia 400 and the lateral condyle 320, so as to obtain a suitable flexion-extension gap balance to position the femoral osteotomy block 22 for femoral osteotomy.

[0047] The measuring part 211 includes two first measuring surfaces 2111 distributed along the first direction X, which are used to be in one-to-one correspondence with the medial condyle 310 and the lateral condyle 320, and the first measuring surface 2111 is a concave surface. By making the two first measuring surfaces 2111 of the measuring part 211 concave, the shape of the two first measuring surfaces 2111 can be adapted to the shape of the medial condyle 310 and the lateral condyle 320 of the femur 300, which is conducive to improving the measurement accuracy of the measuring part 211 of the gap measurer 21. The concave surface of the first measuring surface 2111 can be a concave curved surface, a concave circular surface, or a concave surface formed by a plurality of surfaces.

[0048] The measuring part 211 of the gap measurer 21 provided by the embodiments of the present application can be inserted between the tibia 400 and the medial condyle 310 and the lateral condyle 320 of the femur 300, and the first measuring surface 2111 of the measuring part 211 corresponding to the medial condyle 310 and the lateral condyle 320 of the femur 300 is a concave surface, which can make the two first measuring surfaces 2111 of the measuring part 211 more adapted to the shape of the medial condyle 310 and the lateral condyle 320 of the femur 300, which is conducive to improving the evaluation accuracy of the extension or flexion gap between the medial condyle 310 and the lateral condyle 320 of the femur 300 and the tibia 400 of the patient, and further improving the quality of the operation.

[0049] As shown in Figure 3As shown, the measuring unit 211 also includes a second measuring surface 2116, which is located on the side of the measuring unit 211 opposite to the first measuring surface 2111. In some embodiments, the second measuring surface 2116 can be a plane, which is used to contact the cut plane of the tibia 400. Since the osteotomy surface of the tibia 400 is a plane, by making the second measuring surface 2116 of the measuring unit 211 a plane, the second measuring surface 2116 of the measuring unit 211 can fit more closely to the cut plane of the tibia 400, which is beneficial to improving the accuracy of measuring the distance between the medial condyle 310 and lateral condyle 320 of the tibia 400 and the femur 300.

[0050] Alternatively, the second measuring surface 2116 of the measuring section 211 can be made concave, and the second measuring surface 2116 is used to contact the tibia 400. In this way, the contact area between the second measuring surface 2116 of the measuring section 211 and the tibia 400 can be minimized, which is beneficial to improving the accuracy of measuring the distance between the medial condyle 310 and the lateral condyle 320 of the tibia 400 and the femur 300.

[0051] like Figure 3 As shown, the two first measuring surfaces 2111 of the measuring unit 211 each have a nearest point P to the plane. In some embodiments, the distance m between the two nearest points P in the first direction X can be greater than or equal to 25 mm and less than or equal to 75 mm, so that the lowest point of the two first measuring surfaces 2111 of the measuring unit 211 can be as close as possible to the lowest point of the medial condyle 310 of the femur 300 and the lateral condyle 320 of the femur 400, which is beneficial to improving the measurement accuracy of the measuring unit 211. The distance m between the nearest points P of the two first measuring surfaces 2111 of the measuring unit 211 in the first direction X can be 30 mm, 35 mm, 40 mm, 50 mm, 60 mm, etc.

[0052] Furthermore, one of the two closest points P can be positioned further away from the plane than the other. Moreover, the first measuring surface 2111 containing the closer closest point P is used to contact the medial condyle 310, while the first measuring surface 2111 containing the closer closest point P is used to contact the lateral condyle 320. It is understood that the distances from the medial condyle 310 and lateral condyle 320 of the femur 300 to the tibia 400 are different, and the distance from the lateral condyle 320 to the tibia 400 is smaller. By using the first measuring surface 2111 containing the closer closest point P to contact the medial condyle 310 and the first measuring surface 2111 containing the closer closest point P to contact the lateral condyle 320, the two first measuring surfaces 2111 of the measuring unit 211 can be more appropriately matched to the corresponding medial condyle 310 and lateral condyle 320, which is beneficial for improving the measurement accuracy of the measuring unit 211.

[0053] In addition, the line connecting the two closest points P and the plane can form an included angle a greater than or equal to 1° and less than or equal to 9°, so that the two first measuring surfaces 2111 of the measuring portion 211 are more adapted to the corresponding medial condyle 310 and lateral condyle 320. The line connecting the two closest points P and the plane can form an included angle a of 2°, 4°, 6°, 7°, etc.

[0054] In addition, the line connecting the two closest points P and the plane can form an included angle a greater than or equal to 1° and less than or equal to 9°, so that the two first measuring surfaces 2111 of the measuring portion 211 are more adapted to the corresponding medial condyle 310 and lateral condyle 320. The line connecting the two closest points P and the plane can form an included angle a of 2°, 4°, 6°, 7°, etc.

[0055] Continuing to refer to Figure 3 The first measuring surface 2111 includes opposite first and second edges 2112 and 2113, and the first edge 2112 of the first measuring surface 2111 is closer to the other first measuring surface 2111 than the second edge 2113. In some embodiments, the minimum distance n1 of the first edge 2112 to the plane can be greater than the minimum distance n2 of the second edge 2113 to the plane, so that the two first measuring surfaces 2111 of the measuring portion 211 are more adapted to the corresponding medial condyle 310 and lateral condyle 320, and the measurement accuracy of the measuring portion 211 is improved.

[0056] In addition, the concave surface of the first measuring surface 2111 can be a concave curved surface, and the first measuring surface 2111 intersects with a plane perpendicular to the second direction Y to form a first intersection line 2114. The radius of curvature R1 of the first intersection line 2114 of at least one first measuring surface 2111 is greater than or equal to 10 mm, and the first direction X, the second direction Y and the thickness direction Z of the measuring portion 211 are substantially perpendicular to each other. Thus, the at least one first measuring surface 2111 can be adapted to the shape of the corresponding medial condyle 310 or lateral condyle 320, and the measurement accuracy of the measuring portion 211 is higher.

[0057] It should be noted that the radius of curvature R1 of the first intersection line 2114 of the two first measuring surfaces 2111 can be greater than or equal to 10 mm, or only the radius of curvature R1 of the first intersection line 2114 of one first measuring surface 2111 can be greater than or equal to 10 mm. Of course, the former is advantageous to improve the measurement accuracy of the measuring portion 211.

[0058] In addition, as Figure 4As shown, the inner concave surface can be a concave curved surface, and the first measurement surface 2111 intersects with a plane perpendicular to the first direction X to form a second intersection line 2115, and the radius of curvature R2 of the second intersection line 2115 of at least one first measurement surface 2111 is greater than or equal to 10 mm. Thus, the at least one first measurement surface 2111 can be adapted to the shape of the corresponding medial condyle 310 or lateral condyle 320, and the measurement accuracy of the measurement part 211 is higher.

[0059] It should be noted that the radius of curvature R2 of the second intersection line 2115 of the two first measurement surfaces 2111 can be greater than or equal to 10 mm, or only the radius of curvature R2 of the second intersection line 2115 of one first measurement surface 2111 can be greater than or equal to 10 mm. Of course, the former is advantageous to improve the measurement accuracy of the measurement part 211.

[0060] In some embodiments, the gap measuring device 21 can include a connecting part 212 for connecting with the femoral osteotomy block 22, and both ends of the connecting part 212 are provided with a measurement part 211. Thus, the sizes or models of the measurement parts 211 at both ends of the connecting part 212 can be different, so as to select different sizes or models of the measurement parts 211 for measurement according to different patients. Alternatively, the sizes or models of the measurement parts 211 at both ends of the connecting part 212 can be the same, so as to prolong the service life of the gap measuring device 21, and when one of the measurement parts 211 is damaged or fails, the other measurement part 211 can be used for measurement.

[0061] In some embodiments, the connecting part 212 further includes a connecting hole 2121 for inserting a force line rod. By inserting the force line rod into the connecting hole 2121, the force line rod can be conveniently connected with the connecting part 212, and the operation is very convenient, which is advantageous to improve the surgical efficiency. Specifically, the connecting hole 2121 can penetrate through the connecting part 212 along the first direction X. The number of the connecting holes 2121 is multiple. The multiple connecting holes 2121 are sequentially distributed along the second direction Y.

[0062] The embodiments of the present application also provide a femoral extramedullary positioning osteotomy device, which includes a femoral osteotomy block. The specific structure of the femoral osteotomy block is referred to the above-mentioned embodiments. Since the femoral extramedullary positioning osteotomy device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0063] Specifically, the femoral extramedullary positioning osteotomy device 20 can include a femoral osteotomy block 22 and a gap measuring device 21. The femoral osteotomy block 22 is provided with a femoral osteotomy groove 221. The structure of the gap measuring device 21 can refer to the above-mentioned embodiments, and the gap measuring device 21 is connected with the femoral osteotomy block 22.

[0064] In some embodiments, the femoral bone block 22 can be slidably connected with the gap measurer 21 along a second direction Y, which is substantially perpendicular to the first direction X and the thickness direction Z of the measuring portion of the gap measurer 21 respectively. Thus, after the measuring portion 211 of the gap measurer 21 is inserted between the articular surface and the lateral condyle 320 and the medial condyle 310 of the femur 300, the femoral bone block 22 can be moved along the second direction Y to approach the femur 300, so as to position the femoral bone block 22 more accurately.

[0065] In some embodiments, as shown in Figs. 2 and 3, the connecting portion 212 of the gap measurer 21 can be provided with at least one sliding groove 2122 extending along the second direction Y. The femoral bone block 22 comprises at least one sliding block 222, which is slidably installed in the at least one sliding groove 2122 one by one, so as to stably slidably connect the femoral bone block 22 with the connecting portion 212 of the gap measurer 21 along the second direction Y. Figure 2 Figure 5 In some embodiments, as shown in Figs. 2 and 3, the connecting portion 212 of the gap measurer 21 can be provided with at least one sliding groove 2122 extending along the second direction Y. The femoral bone block 22 comprises at least one sliding block 222, which is slidably installed in the at least one sliding groove 2122 one by one, so as to stably slidably connect the femoral bone block 22 with the connecting portion 212 of the gap measurer 21 along the second direction Y.

[0066] In some embodiments, as shown in Figs. 2 and 3, the connecting portion 212 of the gap measurer 21 can be provided with at least one sliding groove 2122 extending along the second direction Y. The femoral bone block 22 comprises at least one sliding block 222, which is slidably installed in the at least one sliding groove 2122 one by one, so as to stably slidably connect the femoral bone block 22 with the connecting portion 212 of the gap measurer 21 along the second direction Y.

[0067] In some embodiments, as shown in Figs. 2 and 3, the connecting portion 212 of the gap measurer 21 can be provided with at least one sliding groove 2122 extending along the second direction Y. The femoral bone block 22 comprises at least one sliding block 222, which is slidably installed in the at least one sliding groove 2122 one by one, so as to stably slidably connect the femoral bone block 22 with the connecting portion 212 of the gap measurer 21 along the second direction Y.

[0068] In the above embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0069] ​The gap measuring device and the femoral intramedullary positioning bone cutting device provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment description is only used to help understand the technical solutions of the present application and the core ideas thereof. It should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features thereof can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A gap measurer for use in connection with a femoral bone cut, characterized in that, The gap measurer comprises at least one measuring portion for being inserted between a tibia and an inner condyle of a femur to measure a distance between the tibia and the inner condyle, and for being inserted between the tibia and an outer condyle of the femur to measure a distance between the tibia and the outer condyle. The measuring portion comprises two first measuring surfaces distributed along a first direction, the two first measuring surfaces being used for corresponding contact with the inner condyle and the outer condyle respectively, and the first measuring surface being a concave surface.

2. The gap measuring device according to claim 1, wherein The measuring portion comprises a second measuring surface located on a side of the measuring portion away from the first measuring surface. The second measuring surface is a plane used for contact with a cut plane of the tibia; or The second measuring surface is a concave surface used for contact with the tibia.

3. The gap measuring device according to claim 2, wherein The two first measuring surfaces each have a closest point closest to the plane, and a distance m between the two closest points in the first direction is greater than or equal to 25 mm and less than or equal to 75 mm.

4. The gap measuring device of claim 2, wherein The two first measuring surfaces each have a closest point closest to the plane, and one of the closest points is farther away from the plane than the other closest point; the first measuring surface on which the closest point farther away from the plane is used for contact with the inner condyle, and the first measuring surface on which the closest point closer to the plane is used for contact with the outer condyle.

5. The gap measuring device of claim 2, wherein The first measuring surface comprises opposite first and second edges, and the first edge of the first measuring surface is closer to the other first measuring surface than the second edge. The minimum distance n1 from the first edge to the plane is greater than the minimum distance n2 from the second edge to the plane.

6. The gap measuring device of claim 2, wherein The two closest points form an included angle a with the plane, and the included angle a is greater than or equal to 1° and less than or equal to 9°.

7. The gap measuring device according to claim 6, wherein The two closest points form an included angle a with the plane, and the included angle a is greater than or equal to 3° and less than or equal to 5°.

8. The gap measuring device of claim 1, wherein The concave surface is a concave curved surface. The first measuring surface intersects a plane perpendicular to a second direction to form a first intersection line, and a radius of curvature R1 of the first intersection line of at least one first measuring surface is greater than or equal to 10 mm, the first direction, the second direction and a thickness direction of the measuring portion are substantially perpendicular to each other; and / or The first measuring surface intersects a plane perpendicular to the first direction to form a second intersection line, and a radius of curvature R2 of the second intersection line of at least one first measuring surface is greater than or equal to 10 mm.

9. The gap measuring device according to any one of claims 1 to 8, wherein The gap measurer comprises a connecting portion for being connected with a femoral osteotomy block, and both ends of the connecting portion are provided with the measuring portion.

10. The gap measuring device of claim 9, wherein the gap measuring device is configured to measure the gap between the first and second surfaces when the first and second surfaces are in contact with each other. The connecting portion further comprises a connecting hole for inserting a force line rod.

11. A femoral extramedullary positioning osteotomy device, comprising: It comprises: a femoral osteotomy block provided with a femoral osteotomy groove; a gap measurer according to any one of claims 1 to 10, which is connected with the femoral osteotomy block.

12. The femoral extramedullary positioning osteotomy device of claim 11 wherein, The femoral bone block is slidably connected with the gap gauge along a second direction, which is perpendicular to the first direction and a thickness direction of a measuring portion of the gap gauge.

13. The femoral extramedullary positioning osteotomy device of claim 12 wherein, The connecting portion of the gap gauge is provided with at least one sliding groove extending along the second direction, and the at least one sliding groove comprises two opposite inner side surfaces; The femoral bone block comprises at least one sliding block, and the at least one sliding block is slidably installed in the at least one sliding groove one by one, and the sliding block comprises an outer side surface opposite to the inner side surface. One of the inner side surface and the outer side surface is provided with a limiting groove, and the other of the inner side surface and the outer side surface is provided with a limiting portion, and the limiting portion is slidably installed in the limiting groove along the second direction.

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