Guiding device for extending femoral screw

Abstract

The invention discloses a femur extension screw placement guide device, which relates to the technical field of medical instruments and comprises a positioning datum plate, a locking piece and a screw placement guide plate. A positioning guide hole is formed in the positioning datum plate, and a first inserting part is arranged at one end of the positioning datum plate; the two locking pieces are located at the two ends of the positioning guide hole. The two ends of the screw placement guide plate are each provided with a second inserting part, a screw placement guide hole is formed in the screw placement guide plate, and the axis of the screw placement guide hole and the axis of the positioning guide hole are located in the same plane and form an angle of 5-7 degrees. After the positioning needle penetrates through the positioning guide hole and is nailed into the femoral bone, the second inserting part is inserted into the first inserting part, and the axis of the screw placing guide hole can be perpendicular to a mechanical shaft of the femoral bone, so that the fixing needle can be nailed in perpendicular to the mechanical shaft; the positioning datum plate horizontally rotates by 180 degrees, and then the other second inserting part is inserted into the first inserting part, so that the axis of the screw placing guide hole is parallel to the nailed fixing needle, and an operator does not need to manually measure the angle.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a femoral extension nail placement guide device. Background Art

[0002] In femoral lengthening surgery, 3 to 4 pins are first inserted into the upper and lower femurs, and then the middle femur is struck until it fractures. The pins at both ends are then pulled by a bone extender to lengthen the femur as a whole. This allows the femur to be lengthened after healing. However, since the mechanical axis of the femur and the anatomical axis are usually at an angle of about 6° (e.g. Figure 5 To ensure that femoral lengthening does not affect the patient's limb balance, the inserted fixation pins are usually inserted at an angle of approximately 84° to the femoral anatomical axis. In traditional femoral lengthening surgeries, the angle between the fixation pins and the femoral anatomical axis is usually manually confirmed by the surgeon using some relatively complex measuring tools, making the implementation process relatively inconvenient. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a femoral extension nail guide device, the specific technical solution is as follows:

[0004] A femoral lengthening nail placement guide device, comprising:

[0005] A positioning reference plate, wherein a positioning guide hole is formed on the positioning reference plate along its thickness direction, the positioning guide hole is used for a positioning needle to pass through, and a first plug portion is provided at one end of the positioning reference plate;

[0006] A positioning locking structure, comprising two locking members respectively located at both ends of the positioning guide hole, the locking members being used to fix the positioning pin on the positioning reference plate;

[0007] A nail placement guide plate, wherein a second plug-in portion is respectively provided at both ends of the nail placement guide plate, and the second plug-in portion is plugged into and matched with the first plug-in portion. A nail placement guide hole is penetrated through the nail placement guide plate, and the nail placement guide hole is used for allowing the fixing needle to pass through. The axis of the nail placement guide hole and the axis of the positioning guide hole are located in the same plane and form an angle of 5 to 7 degrees between the two.

[0008] Preferably:

[0009] The first plug-in portion is a guide rod, and the guide rod extends along the length direction of the positioning reference plate;

[0010] The second plug-in portion is a guide groove, and the guide groove extends along the length direction of the nail placement guide plate.

[0011] Preferably, the two guide grooves are connected to form a guide channel.

[0012] Preferably:

[0013] A threaded hole is provided on the side of the nail placement guide plate, and the threaded hole is connected from one side of the nail placement guide plate to the guide groove, and the inner thread of the threaded hole is matched with a locking screw;

[0014] The first plug-in portion, the second plug-in portion, the threaded hole and the locking screw together constitute a bidirectional plug-in structure. The bidirectional plug-in structure is provided in two groups, and the two groups of bidirectional plug-in structures are respectively provided adjacent to the two sides of the positioning reference plate and the nail guide plate.

[0015] Preferably, the locking member is a retaining ring.

[0016] Preferably, a guide sleeve is formed on the nail placement guide plate and extends upward relative to the peripheral side portion of the nail placement guide hole.

[0017] Preferably, the guide sleeve is provided with limiting screw holes on its circumference;

[0018] The number of the limiting screw hole is one, and the axis of the limiting screw hole, the axis of the nail placement guide hole, and the axis of the positioning guide hole are located in the same plane;

[0019] Or the number of the limiting screw holes is two, the two limiting screw holes are respectively located on both sides of the guide sleeve, and the axes of the limiting screw holes, the axes of the nail placement guide holes, and the axes of the positioning guide holes are located in the same plane;

[0020] Or the number of the limiting screw holes is three, and the three limiting screw holes are arranged at intervals along the circumference of the guide sleeve.

[0021] Preferably:

[0022] The outer peripheral side of the guide sleeve is inclined inwardly in a direction away from the nail placement guide plate;

[0023] The limiting screw hole is inclined along a direction close to the nail placement guide hole toward a direction close to the nail placement guide plate.

[0024] Preferably:

[0025] A handle is provided on one end of the positioning reference plate away from the first plug-in portion;

[0026] and / or the positioning pin is provided with a length scale, the scale range of the length scale being 100 to 120 mm;

[0027] And / or the number of the nail placement guide holes is one or more. If the number of the nail placement guide holes is multiple, the axes of the multiple nail placement guide holes are located in the same plane and are parallel to each other.

[0028] Preferably, a receiving groove for receiving the locking member is provided at the bottom of the positioning reference plate.

[0029] The femoral extension nail placement guide device provided by the present invention has the following beneficial effects:

[0030] 1. After the positioning pin is nailed into the femur perpendicular to the bone surface, the second plug-in portion at one end of the nail guide plate is plugged into the first plug-in portion at one end of the positioning reference plate. The axis of the nail guide hole on the nail guide plate can be perpendicular to the mechanical axis of the femur, so that the fixation pin can be directly nailed into the femur perpendicular to the mechanical axis of the femur; after the positioning reference plate is rotated horizontally 180°, the other second plug-in portion is plugged into the first plug-in portion, so that the axis of the nail guide hole can be parallel to the already nailed fixation pin, thereby facilitating the insertion of the fixation pin in another part of the femur, without the need for the surgeon to manually measure the angle.

[0031] 2. First, nail the positioning pin into the femur perpendicular to the bone surface for positioning, and then nail the fixation pin. Avoid nailing the fixation pin directly at an angle to the bone surface, which may cause the tip of the fixation pin to slip during the nailing process.

[0032] 3. After the fixation pins are inserted into the upper and lower sections of the femur, the device and positioning pins are removed. The positioning pins can form a nail hole between the two sections of the fixation pins. When the fracture is subsequently tapped, the fracture crack can extend along the nail hole, thereby preventing the fracture from spreading along the circumferential side when the fracture is tapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the three-dimensional structure of a femoral extension nail placement guide device provided in an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the three-dimensional structure of a nail placement guide plate provided in an embodiment of the present invention;

[0036] Figure 3 A cross-sectional side view of a nail placement guide plate provided in another embodiment of the present invention;

[0037] Figure 4 A cross-sectional side view of a positioning reference plate provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the installation of a fixation pin for femoral lengthening surgery in the background technology of the present invention.

[0039] Reference numerals

[0040] 100-femur; 200-mechanical axis; 300-anatomical axis; 400-bone extender;

[0041] 10- positioning needle; 20- fixing needle;

[0042] 1-positioning reference plate; 11-positioning guide hole; 12-first plug-in portion; 13-accommodating groove;

[0043] 2-positioning locking structure; 21-locking member;

[0044] 3-nail guide plate; 31-second plug-in portion; 32-nail guide hole; 33-guide sleeve; 331-limiting screw hole; 34-threaded hole;

[0045] 4-Handle. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0047] It should be noted that similar reference numerals denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in the subsequent drawings.

[0048] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0049] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0050] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0051] See Figures 1 to 4 This embodiment provides a femoral extension nail guide device, including a positioning reference plate 1, a positioning locking structure 2 and a nail guide plate 3.

[0052] A positioning guide hole 11 is formed through the positioning reference plate 1 along its thickness direction. The positioning guide hole 11 is used for the positioning pin 10 to pass through. A first plug-in portion 12 is provided at one end of the positioning reference plate 1 .

[0053] The positioning locking structure 2 includes two locking members 21 located at both ends of the positioning guide hole 11 , respectively. The locking members 21 are used to fix the positioning pin 10 on the positioning reference plate 1 .

[0054] A second plug-in portion 31 is provided at each end of the nail guide plate 3, and the second plug-in portion 31 is plugged into the first plug-in portion 31. A nail guide hole 32 is provided through the nail guide plate 3, and the nail guide hole 32 is used for the fixing needle 20 to pass through. The axis of the nail guide hole 32 and the axis of the positioning guide hole 11 are located in the same plane and form an angle of 5 to 7 degrees between the two.

[0055] Among them, see Figure 5 In the femoral lengthening surgery described in the background, the mechanical axis 200 of the femur 100 forms an angle of approximately 6° with the anatomical axis 300. Therefore, when inserting the anchor pins 20, they need to be tilted to an angle of approximately 84° with the anatomical axis 300. This means that the anchor pins 20 are perpendicular to the mechanical axis 200, and the multiple anchor pins 20 inserted are parallel to each other. After the anchor pins 20 are inserted, the middle of the femur 100 is hammered until a fracture occurs. The bone extender 400 then pulls the anchor pins 20 at the upper and lower sections of the femur 100, lengthening the entire femur 100. Once the femur 100 heals, the femur 100 can be lengthened.

[0056] Among them, the positioning guide hole 11 can be transitionally matched with the positioning pin 10, the diameter of the positioning pin 10 can be 2 mm, and the length can be freely selected according to the patient's body shape; the locking member 21 can be a locking structure such as a tightening ring; the nail guide hole 32 can be transitionally matched with the fixing pin 20, and its aperture can also be larger than the diameter of the fixing pin 20. If the aperture of the nail guide hole 32 is larger than the diameter of the fixing pin 20, a limiting structure can be provided in the nail guide hole 32 so that the fixing pin 20 inserted into the nail guide hole 32 is parallel to the axis of the nail guide hole 32; illustratively, the diameter of the fixing pin 20 can be selected from 2 mm, 4 mm or 6 mm, and the aperture of the nail guide hole 32 can be the same as the diameter of the fixing pin 20, or it can be fixed at 6 mm. If the aperture of the nail guide hole 32 is fixed at 6 mm, a limit screw or other structure can be screwed into the nail guide hole 32 radially to make the fixing pin 20 parallel to the axis of the nail guide hole 32; the angle between the axis of the nail guide hole 32 and the axis of the positioning guide hole 11 is preferably 6°.

[0057] When it is necessary to install the fixing pin 20, the positioning pin 10 can be passed through the positioning guide hole 11 first, and then the two locking pieces 21 can be passed through the needle body of the positioning pin 10 from both ends of the positioning pin 10. At this time, the locking piece 21 away from the tip of the positioning pin 10 is locked, so that a preset length can be reserved between the positioning reference plate 1 and the tip of the positioning pin 10, and the locking piece 21 close to the tip of the positioning pin 10 is temporarily not locked; then the positioning pin 10 is nailed in a direction perpendicular to the bone surface, that is, the positioning pin 10 is nailed in a direction perpendicular to the anatomical axis 300, and the depth of the positioning pin 10 nailed into the femur 100 is judged by the locked locking piece 21. When the nailing depth meets the requirement, the locking piece 21 close to the tip of the positioning pin 10 can be further locked, thereby limiting the sliding of the positioning reference plate 1 on the positioning pin 10; then the other parts of the nail guide plate 3 are tightened. A second plug-in portion 31 is plugged into the first plug-in portion 12 of the positioning reference plate 1 and fixed. At this time, the axis of the nail guide hole 32 is at an angle of 5 to 7 degrees to the axis of the positioning guide hole 11. Then, the fixing pin 20 can be inserted into the nail guide hole 32 and then the fixing pin 20 can be nailed into the femur 100; after the positioning pin 20 is nailed into a section of the femur, the locking piece 21 away from the tip of the positioning pin 10 can be unlocked, so that the positioning reference plate 1 and the nail guide plate 3 can be pulled out. After being pulled out, the positioning reference plate 1 is horizontally rotated 180 degrees and then inserted from the tail of the positioning pin 10. Then the locking piece 21 is locked again. At this time, the axis of the nail guide hole 32 is parallel to the fixed pin 20 that has been nailed in. Then, the fixing pin 20 is continued to be inserted into the nail guide hole 32 and then nailed into the femur 100, and the device and the positioning pin 10 can be removed. It should be noted that after the positioning pin 10 is driven in, when the second plug-in portion 31 is plugged into the first plug-in portion 12 , the second plug-in portion 31 must be selected according to the actual direction so that the driven fixing pin 20 can be perpendicular to the mechanical axis 200 .

[0058] Of course, when installing the fixing pin 20, you can also first secure one of the locking members 21 to the positioning pin 10, then drive the fixing pin 10 perpendicular to the bone surface into the femur 100, and then sequentially insert the positioning reference plate 1 and the other locking member 21 along the trailing end of the positioning pin 10 and secure it. The remaining steps are the same as the above installation process. The purpose of first securing one locking member 21 is mainly to facilitate the determination of the driving depth of the positioning pin 10. The specific installation method can be freely selected according to actual needs.

[0059] The femoral extension nail placement guide device provided in this embodiment has the following beneficial effects:

[0060] 1. After the positioning pin 10 is nailed into the femur 100 perpendicularly to the bone surface, the second plug-in portion 32 at one end of the nail guide plate 3 is plugged into the first plug-in portion 12 at one end of the positioning reference plate 1. The axis of the nail guide hole 32 on the nail guide plate 3 can be perpendicular to the mechanical axis 200 of the femur 100, so that the fixing pin 20 can be directly nailed into the femur 100 perpendicular to the mechanical axis 200 of the femur 100; after the positioning reference plate 1 is horizontally rotated 180°, the other second plug-in portion 32 is plugged into the first plug-in portion 12, so that the axis of the nail guide hole 32 can be parallel to the already nailed fixing pin 20, thereby facilitating the nailing of the fixing pin 20 in another section of the femur 100 without the need for the surgeon to manually measure the angle.

[0061] 2. First, nail the positioning pin 10 into the femur 100 perpendicular to the bone surface for positioning, and then nail the fixing pin 20 to avoid directly nailing the fixing pin 20 obliquely to the bone surface, which may cause the tip of the fixing pin 20 to slip during the nailing process.

[0062] 3. After the fixing pins 20 are inserted into the upper and lower sections of the femur 100, the device and the positioning pin 10 are removed. The positioning pin 10 can form a nail hole between the two sections of the fixing pin 20. When the fracture is subsequently struck, the fracture crack can extend along the nail hole, thereby preventing the bone fracture from spreading along the circumferential side when the fracture is struck.

[0063] Further, see Figure 1 The first plug-in portion 12 is a guide rod, which extends along the length direction of the positioning reference plate 1; the second plug-in portion 31 is a guide groove, which extends along the length direction of the nail guide plate 3; specifically, the guide rod and the guide groove are both perpendicular to the positioning pin 10, so that the nail guide plate 3 can move horizontally.

[0064] Furthermore, the two guide grooves are connected to form a guide channel, and the guide rod can pass through the guide channel, so that the nail guide plate 3 has a wider range of movement, which is beneficial to the distance adjustment between the fixing needle 20 and the positioning needle 10.

[0065] Further, see Figure 2 :

[0066] A threaded hole 34 is provided on the side of the nail placement guide plate 3. The threaded hole 34 is connected to the guide groove from one side of the nail placement guide plate 3. The internal thread of the threaded hole 34 is matched with a locking screw.

[0067] The first plug-in portion 12, the second plug-in portion 31, the threaded hole 34 and the locking screw together constitute a bidirectional plug-in structure. There are two groups of bidirectional plug-in structures, which are respectively arranged adjacent to the two sides of the positioning reference plate 1 and the nail guide plate 3.

[0068] Among them, the threaded hole 34 can be set on the side arm or top of the nail placement guide plate 3, and the threaded hole 34 can also be set on the side of the nail placement guide plate 3 near its end position. The locking screw can be a flat-bottomed screw. When the guide rod is inserted into the guide groove, it is only necessary to tighten the locking screw in the threaded hole 34 adjacent to the positioning reference plate 1 to fix the nail placement guide plate 3 on the guide rod.

[0069] Further, see Figure 1 , the locking member 21 is a retaining ring.

[0070] Among them, in the embodiment provided in this embodiment, the locking piece 21 away from the tip of the positioning needle 10 can be integrally connected to the positioning reference plate 1, or the locking piece 21 close to the tip of the positioning needle 10 can be integrally connected to the positioning reference plate 1, or both locking pieces 21 are integrally connected to the positioning reference plate 1.

[0071] Further, see Figure 2 The side portion of the nail guide plate 3 relative to the nail guide hole 32 extends upward to form a guide sleeve 33, thereby increasing the length of the nail guide hole 32.

[0072] Furthermore, a limiting screw hole 331 is provided on the circumference of the guide sleeve 33 .

[0073] The number of the limiting screw hole 331 can be one, and the axis of the limiting screw hole 331, the axis of the nail guide hole 32 and the axis of the positioning guide hole 11 are located in the same plane.

[0074] Alternatively, there may be two limiting screw holes 331 , which are located on both sides of the guide sleeve 33 , and the axes of the limiting screw holes 331 , the pin guide hole 32 , and the positioning guide hole 11 are located in the same plane.

[0075] When the number of limiting screw holes 331 is one or two, it is only necessary to screw the screw into one limiting screw hole 331 to limit the diameter of the fixing pin 20 that can pass through the nail guide hole 32; when the fixing pin 20 passes through the nail guide hole 32, the screw can support the side wall of the fixing pin 20 and push the fixing pin 20 toward the side of the nail guide hole 32, so that the fixing pin 20 remains parallel to the axis of the nail guide hole 32; if the number of limiting screw holes 331 is two, it is only necessary to screw the screw into the limiting screw hole 331 on the side away from the positioning pin 10.

[0076] Alternatively, the number of limiting screw holes 331 may be three, with the three limiting screw holes 331 spaced apart along the circumference of the guide sleeve 33. If there are three limiting screw holes 331, the screws screwed into the limiting screw holes 331 must be flat-bottomed screws to ensure that the fixing pin 20 inserted into the nail guide hole 32 is parallel to the axis of the nail guide hole 32.

[0077] Further, see Figure 3 In another embodiment provided in this embodiment, the outer peripheral side of the guide sleeve 33 is inclined inwardly in a direction away from the nail guide plate 3.

[0078] The limiting screw hole 331 is inclined from a direction close to the nail placement guide hole 32 to a direction close to the nail placement guide plate 3 .

[0079] Specifically, the guide sleeve 33 forms an approximately truncated cone structure, and the axis of the limiting screw hole 331 can be perpendicular to the generatrix of the truncated cone structure, so that the limiting screw hole 331 is tilted upward, making it easier for the operator to screw the screw into the limiting screw hole 331.

[0080] Furthermore, in the examples provided in this embodiment:

[0081] A handle 4 is provided on the end of the positioning reference plate 1 away from the first plug-in portion 12 to facilitate operation by the operator.

[0082] And / or the positioning needle 10 is provided with a length scale, the scale range of the length scale is 100-120 mm, so as to adapt to patients of different body shapes and facilitate the operator to select the locking position of the locking piece 21 on the positioning needle 10.

[0083] And / or the number of nail placement guide holes 32 is one or more. If the number of nail placement guide holes 32 is multiple, the axes of the multiple nail placement guide holes 32 are located in the same plane and are parallel to each other; exemplarily, the number of nail placement guide holes 32 is three, and the three nail placement guide holes 32 are evenly distributed along the length direction of the nail placement guide plate 3, and the axes of the three nail placement guide holes 32 are parallel to each other.

[0084] Further, see Figure 4The bottom of the positioning reference plate 1 is provided with a receiving groove 13 for accommodating the locking member 21. The locking member 21 at the bottom of the positioning reference plate 1 can be accommodated in the receiving groove 13, so that the bottom of the positioning reference plate 1 fits the surface of the patient's thigh and the axis of the positioning guide hole 11 is perpendicular to the bone surface of the femur 100.

[0085] Principle description:

[0086] When it is necessary to install the fixing pin 20, first pass the positioning pin 10 through the positioning guide hole 11, and then pass the two locking pieces 21 through the needle body of the positioning pin 10 from both ends of the positioning pin 10. At this time, the locking piece 21 away from the tip of the positioning pin 10 is locked, so that a preset length can be reserved between the positioning reference plate 1 and the tip of the positioning pin 10, and the locking piece 21 close to the tip of the positioning pin 10 is temporarily not locked; then the positioning pin 10 is nailed in a direction perpendicular to the bone surface, that is, the positioning pin 10 is nailed in a direction perpendicular to the anatomical axis 300, and the depth of the positioning pin 10 nailed into the femur 100 is judged by the locked locking piece 21. When the nailing depth meets the requirement, the locking piece 21 close to the tip of the positioning pin 10 is further locked, thereby limiting the sliding of the positioning reference plate 1 on the positioning pin 10; then one of the nail guide plates 3 is screwed in A second plug-in portion 31 is plugged into the first plug-in portion 12 of the positioning reference plate 1 and fixed. At this time, the axis of the nail guide hole 32 is at an angle of 5 to 7 degrees to the axis of the positioning guide hole 11. Then, the fixing pin 20 can be inserted into the nail guide hole 32 and then the fixing pin 20 can be nailed into the femur 100; after the positioning pin 20 is nailed into a section of the femur, the locking piece 21 away from the tip of the positioning pin 10 is unlocked, so that the positioning reference plate 1 and the nail guide plate 3 are pulled out. After being pulled out, the positioning reference plate 1 is horizontally rotated 180 degrees and then inserted from the tail of the positioning pin 10, and then the locking piece 21 is locked again. At this time, the axis of the nail guide hole 32 is parallel to the fixed pin 20 that has been nailed in. Then, the fixing pin 20 is continued to be inserted into the nail guide hole 32 and then nailed into the femur 100, and the device and the positioning pin 10 can be removed. It should be noted that after the positioning pin 10 is driven in, when the second plug-in portion 31 is plugged into the first plug-in portion 12 , the second plug-in portion 31 must be selected according to the actual direction so that the driven fixing pin 20 can be perpendicular to the mechanical axis 200 .

[0087] When installing the fixing pin 20, you can also first fix one of the locking parts 21 on the positioning pin 10, and then nail the fixing pin 10 into the femur 100 perpendicular to the bone surface, and then insert and fix the positioning reference plate 1 and the other locking part 21 along the tail end of the positioning pin 10 in turn. The remaining steps are the same as the above installation process.

[0088] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0089] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A femoral extension nail guide device, characterized in that: include: A positioning reference plate (1), wherein a positioning guide hole (11) is provided on the positioning reference plate (1) along its thickness direction, the positioning guide hole (11) is used for allowing a positioning needle (10) to pass through, and a first plug-in portion (12) is provided at one end of the positioning reference plate (1); A positioning locking structure (2) comprising two locking members (21) respectively located at both ends of the positioning guide hole (11), wherein the locking members (21) are used to fix the positioning needle (10) on the positioning reference plate (1); A nail placement guide plate (3), wherein a second plug-in portion (31) is respectively provided at both ends of the nail placement guide plate (3), and the second plug-in portion (31) is plugged into and matched with the first plug-in portion (31). A nail placement guide hole (32) is provided through the nail placement guide plate (3), and the nail placement guide hole (32) is used for allowing a fixing needle (20) to pass through. The axis of the nail placement guide hole (32) and the axis of the positioning guide hole (11) are located in the same plane and form an angle of 5 to 7 degrees between the two.

2. The femoral lengthening nail guide device according to claim 1, characterized in that: The first plug-in portion (12) is a guide rod, and the guide rod extends along the length direction of the positioning reference plate (1); The second plug-in portion (31) is a guide groove, and the guide groove extends along the length direction of the nail placement guide plate (3).

3. The femoral lengthening nail guide device according to claim 2, characterized in that: The two guide grooves are connected to form a guide channel.

4. The femoral lengthening nail guide device according to claim 3, characterized in that: The side of the nail placement guide plate (3) is provided with a threaded hole (34), the threaded hole (34) is connected to the guide groove from one side of the nail placement guide plate (3), and the internal thread of the threaded hole (34) is matched with a locking screw; The first plug-in portion (12), the second plug-in portion (31), the threaded hole (34) and the locking screw together form a bidirectional plug-in structure. The bidirectional plug-in structure is provided in two groups, and the two groups of bidirectional plug-in structures are respectively provided adjacent to the two sides of the positioning reference plate (1) and the nail guide plate (3).

5. The femoral lengthening nail guide device according to claim 1, characterized in that: The locking member (21) is a retaining ring.

6. The femoral lengthening nail guide device according to claim 1, characterized in that: A guide sleeve (33) is formed on the nail placement guide plate (3) by extending upward from a peripheral portion relative to the nail placement guide hole (32).

7. The femoral lengthening nail guide device according to claim 6, characterized in that: The guide sleeve (33) is provided with a limiting screw hole (331) on its circumferential side; The number of the limiting screw hole (331) is one, and the axis of the limiting screw hole (331), the axis of the nail guide hole (32), and the axis of the positioning guide hole (11) are located in the same plane; Or the number of the limiting screw holes (331) is two, the two limiting screw holes (331) are respectively located on both sides of the guide sleeve (33), and the axes of the limiting screw holes (331), the axes of the nail guide holes (32), and the axes of the positioning guide holes (11) are located in the same plane; Or the number of the limiting screw holes (331) is three, and the three limiting screw holes (331) are spaced apart along the circumference of the guide sleeve (33).

8. The femoral lengthening nail guide device according to claim 7, characterized in that: The outer peripheral side of the guide sleeve (33) is inclined inwardly in a direction away from the nail placement guide plate (3); The limiting screw hole (331) is inclined from a direction close to the nail placement guide hole (32) to a direction close to the nail placement guide plate (3).

9. The femoral lengthening nail guide device according to claim 1, characterized in that: A handle (4) is provided on the positioning reference plate (1) at one end away from the first plug-in portion (12); And / or the positioning needle (10) is provided with a length scale, and the scale range of the length scale is 100 to 120 mm; And / or the number of the nail placement guide holes (32) is one or more. If the number of the nail placement guide holes (32) is multiple, the axes of the multiple nail placement guide holes (32) are located in the same plane and are parallel to each other.

10. The femoral lengthening nail guide device according to claim 5, characterized in that: The bottom of the positioning reference plate (1) is provided with an accommodating groove (13) for accommodating the locking member (21).

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