Knee joint replacement extramedullary positioning femoral distal osteotome

Abstract

This application relates to the field of medical device technology, specifically to an extramedullary positioning distal femoral osteotomy device for knee replacement, comprising an osteotomy plate, an axial indicator, a rotating component, and a reference plate. The osteotomy plate has a reference end face and an abutment end face, with a cutting suture and pin holes provided on the reference end face. The axial indicator is rotatably mounted on the reference end face; the rotating component is rotatably mounted on the reference end face; the reference plate is slidably mounted on the rotating component, and the reference plate can slide on the rotating component in a direction away from or close to the rotation axis of the rotating component, with the reference plate perpendicular to the reference end face. In this application, the axial indicator determines the direction of the patient's femoral axis, ensuring that the movement of the osteotomy plate is consistent with the direction of the femoral axis, thereby improving the accuracy of the cutting position during surgery. The rotating component and the reference plate allow the surgeon to adjust according to the preoperatively determined angle of the prosthesis articular surface, enabling precise matching of the cutting suture angle with the prosthesis articular surface, further improving the precision of the surgery.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to an extramedullary positioning distal femoral osteotomy device for knee replacement. Background Technology

[0002] As my country's population ages, knee replacement surgery is becoming more common. Despite the rapid development of knee prostheses, the key to the effectiveness of knee surgery still lies in surgical technique. The accuracy of the force line in knee replacement is closely related to the long-term lifespan of the prosthesis.

[0003] Traditional intramedullary femoral positioning increases the risk of intramedullary hemorrhage and is closely related to the needle insertion point, the depth of the intramedullary rod insertion, the thickness of the femoral cavity itself, and the curvature of the anterior or lateral arch of the femoral shaft.

[0004] The advantage of traditional femoral extramedullary navigation is that it does not require medullary reaming, reducing medullary cavity bleeding. Although navigation reduces errors, the operation time is longer and the learning curve is longer. Utility Model Content

[0005] The purpose of this application is to provide an extramedullary femoral osteotomy device for knee replacement, which can achieve extramedullary positioning of the distal femoral osteotomy, reducing operation time and blood loss.

[0006] To achieve the above objectives, this application provides an extramedullary femoral osteotomy device for knee replacement, comprising:

[0007] An osteotomy plate, the osteotomy plate having a reference end face and an abutting end face that is parallel to and opposite to the reference end face, the reference end face having a bone cutting suture and a nail hole penetrating the osteotomy plate;

[0008] An axial indicator is rotatably mounted on the reference end face with its rotation axis perpendicular to the reference end face.

[0009] A rotating component, which is rotatably mounted on the reference end face and whose rotation axis is perpendicular to the reference end face;

[0010] A reference plate is slidably mounted on the rotating member. The reference plate is capable of sliding on the rotating member in a direction away from or close to the rotation axis of the rotating member. The reference plate is perpendicular to the reference end face.

[0011] In an optional implementation, it further includes:

[0012] A fixed sleeve is vertically fixed to the reference end face of the osteotomy plate. The axial indicator is rotatably engaged with the fixed sleeve, and the rotating element is rotatably engaged with the fixed sleeve.

[0013] In an optional embodiment, the axial indicator includes:

[0014] A first rod and a second rod, wherein the first rod is perpendicular to the second rod, the second rod is rotatably installed in the fixed sleeve, and the first rod is parallel to the reference end face.

[0015] In an optional implementation, it further includes:

[0016] A locking element is installed on one end of the rotating member near the fixed sleeve, and the locking element enables the rotating member to be locked to the fixed sleeve.

[0017] In an optional embodiment, the locking element is a threaded rod. A locking through hole is provided on one end of the rotating element near the fixed sleeve along the radial direction of the fixed sleeve. One end of the threaded rod is threaded into the locking through hole. Rotating the threaded rod causes it to move toward the fixed sleeve, and the threaded rod abuts against the fixed sleeve to lock the rotating element with the fixed sleeve.

[0018] In an optional embodiment, the two ends of the rotating member are a first end and a second end, the rotating member rotates around the first end as the rotation center, and a limit protrusion is provided on the second end to prevent the reference plate from sliding off the second end.

[0019] In an optional embodiment, the structure between the first end and the second end of the rotating member is divided into a sliding section and an indicator section, with the sliding section closer to the second end and the indicator section closer to the first end;

[0020] The reference plate is slidably mounted on the sliding section;

[0021] The reference end face is provided with a scale corresponding to the rotation angle of the rotating component, and the projection of the indicator segment on the reference end face coincides with the scale on the reference end face.

[0022] In an optional embodiment, the sliding segment is arranged along a straight line parallel to the reference end face, and one end of the sliding segment near the indicator segment can be projected onto the reference end face. The distance between the sliding segment and the osteotomy plate in the direction of rotation of the sliding segment is H, and the minimum length of the reference plate in the direction of rotation of the sliding segment is L, where H < L, so that the osteotomy plate can prevent the reference plate from sliding from the sliding segment to the indicator segment.

[0023] In an optional embodiment, the reference plate includes two sub-plates with an observation gap between them.

[0024] In an optional embodiment, the axial indicator further includes:

[0025] A connecting plate and a third rod, one end of the connecting plate being connected to the first rod or the second rod, and the other end of the connecting plate being connected to the third rod, the third rod being parallel to the first rod.

[0026] The osteotomy device provided in this application does not require entry into the medullary cavity, thereby reducing medullary bleeding and potential trauma, which is more beneficial for the patient's postoperative recovery. The adjustable design of the rotating component and reference plate allows the surgeon to make personalized adjustments according to the patient's specific situation, adapting to different patients' femoral morphology and surgical needs. In this application, the direction of the patient's femoral axis is determined by the axial indicator, ensuring that the movement of the osteotomy plate is consistent with the direction of the femoral axis, thereby improving the accuracy of the cutting position during surgery. The setting of the rotating component and reference plate allows the surgeon to adjust according to the prosthesis articular surface angle determined before surgery, so that the angle of the cutting suture is precisely matched with the prosthesis articular surface, further improving the precision of the surgery.

[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the structure from one perspective of one embodiment of an extramedullary positioning distal femoral osteotomy device for knee replacement provided in this application;

[0030] Figure 2 A schematic diagram of the structure from one perspective of another embodiment of an extramedullary positioning distal femoral osteotomy device for knee replacement provided for the purposes of this application;

[0031] Figure 3 A two-view structural schematic diagram of another embodiment of an extramedullary positioning distal femoral osteotomy device for knee replacement provided for the purposes of this application;

[0032] Figure 4 Two-view usage diagrams of another embodiment of an extramedullary femoral osteotomy device for knee replacement provided for the purposes of this application.

[0033] icon:

[0034] 100 - Osteotomy plate; 110 - Reference end face; 120 - Osteotomy suture; 130 - Pin hole; 140 - Scale;

[0035] 200 - Axial indicator; 210 - First rod; 220 - Second rod; 230 - Third rod; 240 - Connecting plate;

[0036] 300 - Rotating component; 310 - First end; 320 - Second end; 330 - Sliding section; 340 - Indicating section; 350 - Limiting protrusion;

[0037] 400 - Reference plate; 410 - Sub-plate body; 420 - Observation gap;

[0038] 500-Fixed Sleeve;

[0039] 600 - Locking component. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] The embodiments of this application provide an extramedullary femoral osteotomy device for knee replacement surgery, used to determine the installation position of the articular surface of the knee prosthesis and the cutting position of the distal femur during knee replacement surgery. The osteotomy device provided in the embodiments of this application does not need to enter the medullary cavity, thus reducing medullary bleeding.

[0044] The extramedullary femoral osteotomy device for knee replacement includes an osteotomy plate 100, an axial indicator 200, a rotating component 300, and a reference plate 400.

[0045] like Figure 1 As shown, the osteotomy plate 100 has a reference end face 110 and an abutment end face that is parallel to and opposite to the reference end face 110. The reference end face 110 is provided with a bone cutting suture 120 and a nail hole 130 that penetrate the osteotomy plate 100.

[0046] For example, such as Figure 4 As shown, the abutment face abuts against the distal end face of the patient's femur. The distal end of the femur is the end of the femur furthest from the buttock. The abutment face and the reference face 110 are perpendicular to the radial direction of the femur.

[0047] For example, when harvesting the end of a patient's femur, the cut is made along the osteotomy suture 120.

[0048] The axial indicator 200 is rotatably mounted on the reference end face 110 with its rotation axis perpendicular to the reference end face 110. The axial indicator 200 is used to determine the direction of the patient's femoral axis. During use, the doctor manually rotates the axial indicator 200 to a direction parallel to the femoral axis, which limits the movement direction of the osteotomy plate 100 to the axial direction of the axial indicator 200 (i.e., the direction of the femoral axis) and limits the rotation direction of the osteotomy plate 100 to the circumferential direction of the rotation axis of the axial indicator 200.

[0049] like Figure 1 As shown, the rotating component 300 is rotatably mounted on the reference end face 110 and the axis of rotation is perpendicular to the reference end face 110.

[0050] like Figure 1 As shown, the reference plate 400 is slidably mounted on the rotating member 300. The reference plate 400 can slide on the rotating member 300 in a direction away from or close to the rotation axis of the rotating member 300, so that the reference plate 400 can adapt to the distal femur of different sizes. The reference plate 400 is perpendicular to the reference end face 110.

[0051] For example, such as Figure 4 As shown, reference plate 400 abuts against the articular surface of the distal femur of the patient.

[0052] For example, initially, the rotating component 300 is perpendicular to the osteotomy suture 120, and the reference plate 400 is parallel to the osteotomy suture 120. Before surgery, the angle α of the prosthesis articular surface is determined based on the X-ray. Then, the rotating component 300 is rotated so that the angle between the rotating component 300 and the perpendicular direction of the osteotomy suture is α. During the rotation of the rotating component 300 around its rotation axis, the reference plate 400 is driven to rotate around the rotation axis of the rotating component 300, thereby making the angle between the reference plate 400 and the osteotomy suture α. The reference plate 400 is then placed against the articular surface of the distal femur of the patient. The projection of the osteotomy suture on the distal femur is the point where the femur is cut. The bone screw is inserted into the screw hole 130 of the osteotomy plate 100 and fixed to the femur, thus fixing the osteotomy plate 100 to the patient's femur. Then, the surgeon inserts the osteotomy knife into the osteotomy suture 120 and cuts the patient's femur along the osteotomy suture.

[0053] In this application, the axial indicator 200 determines the direction of the patient's femoral axis, ensuring that the movement of the osteotomy plate 100 is consistent with the direction of the femoral axis, thereby improving the accuracy of the cutting position during surgery. The rotating component 300 and the reference plate 400 allow the surgeon to adjust according to the preoperatively determined prosthesis articular surface angle α, so that the angle between the cutting suture and the prosthesis articular surface is precisely matched, further improving the precision of the surgery.

[0054] The osteotomy device provided in the embodiments of this application does not require entry into the medullary cavity, thereby reducing medullary bleeding and potential trauma, which is more beneficial to the patient's postoperative recovery. The adjustable design of the rotating component 300 and the reference plate 400 allows the surgeon to make personalized adjustments according to the patient's specific situation, adapting to the femoral morphology and surgical needs of different patients.

[0055] In this application, the osteotomy device is fixed to the femur with bone screws, ensuring stability during the operation and reducing surgical risks. The reference plate 400 allows the surgeon to visually observe and adjust the cutting position, further improving the safety of the surgery.

[0056] For example, such as Figure 1 or Figure 2 As shown, the osteotomy suture 120 extends from the reference end face 110 through the osteotomy plate 100 to the abutting end face, and the depth direction of the osteotomy suture 120 is perpendicular to the reference end face 110 and the abutting end face of the osteotomy plate 100.

[0057] like Figure 1 or Figure 2As shown, in one embodiment, at least two bone-cutting sutures 120 are arranged in parallel, with adjacent bone-cutting sutures 120 spaced apart. When the cutting position of one of the bone-cutting sutures 120 is unsuitable, the surgeon can select the most suitable bone-cutting suture 120 for cutting during the operation, based on the actual situation. This design increases the flexibility of the surgery and adapts to the femoral morphology and surgical needs of different patients. When the cutting position of a certain bone-cutting suture 120 is unsuitable, the surgeon can replace it with another bone-cutting suture 120 to find a more suitable cutting position. This helps to ensure the accuracy and precision of the cutting, thereby improving the success rate of the surgery.

[0058] For example, such as Figure 1 As shown, two bone-cutting sutures 120 are provided. In another embodiment, three bone-cutting sutures 120 are provided. Of course, in other embodiments, the number of bone-cutting sutures 120 can also be other than four, five, or six.

[0059] like Figure 1 or Figure 2 As shown, in one embodiment, at least two sets of nail holes 130 are provided, each set having at least two nail holes 130, and adjacent nail holes 130 are spaced at equal intervals.

[0060] The osteotomy plate 100 is fixed to the patient's femur by bone screws. If the location of the osteotomy seam 120 is not suitable for cutting the femur, the doctor removes the osteotomy plate 100 from the bone screw and installs another screw hole 130 on the bone screw to adjust the position of the osteotomy seam 120, thereby adjusting the femur cutting position. This simplifies the adjustment process and makes the surgical operation more convenient and efficient.

[0061] The osteotomy plate 100 is fixed to the patient's femur by bone screws. The design of multiple sets of screw holes 130 provides more fixation point options, which helps to enhance the stability of the osteotomy plate 100 during surgery. This helps to reduce shaking and displacement during surgery and improves surgical safety.

[0062] For example, two sets of nail holes 130 are provided, with two nail holes 130 in each set, and the two sets of nail holes 130 are distributed sequentially along the length direction of the osteotomy suture 120. In one embodiment, two sets of nail holes 130 are provided, with three nail holes 130 in each set, and the two sets of nail holes 130 are distributed sequentially along the length direction of the osteotomy suture 120, with the nail holes 130 in the same set arranged in a triangular pattern and at equal intervals.

[0063] To enable the axial indicator 200 and the rotating component 300 to be rotatably mounted on the osteotomy plate 100, such as Figure 1 or Figure 2As shown, in one embodiment, the extramedullary positioning distal femoral osteotomy device for knee replacement also includes a fixing sleeve 500, which is vertically fixed on the reference end face 110 of the osteotomy plate 100. Exemplarily, the fixing sleeve 500 is fixed on the reference end face 110 of the osteotomy plate 100 by means of welding, snap-fitting, bolt fixing, threaded connection or adhesive.

[0064] The axial indicator 200 is rotatably engaged with the fixed sleeve 500, and the rotating component 300 is rotatably engaged with the fixed sleeve 500.

[0065] In this application, the axial indicator 200 and the rotating component 300 are vertically fixed to the reference end face 110 of the osteotomy plate 100 by the fixing sleeve 500, which ensures stability and reliability during use, thereby improving the accuracy and safety of the operation.

[0066] To ensure that the axial indicator 200 matches the direction of the femoral axis, such as Figure 1 or Figure 2 As shown, in one embodiment, the axial indicator 200 includes a first rod 210 and a second rod 220, which are arranged perpendicularly to each other. Exemplarily, the first rod 210 and the second rod 220 are fixedly connected by welding, snap-fitting, bolting, riveting, gluing, or integral molding.

[0067] The second rod 220 is rotatably installed in the fixed sleeve 500. For example, the outer wall of the second rod 220 is rotatably engaged with the inner wall of the fixed sleeve 500. The first rod 210 is parallel to the reference end face 110. During use, the first rod 210 is parallel to the patient's femoral axis.

[0068] In this application, the axial indicator 200 consists of a first rod 210 and a second rod 220, with the first rod 210 designed to be parallel to the axial direction of the patient's femur. This design ensures that the axial indicator 200 can accurately match the axial direction of the femur, providing an accurate positioning reference for the surgery and improving the precision and success rate of the operation.

[0069] In this application, the second rod 220 is rotatably mounted in the fixed sleeve 500, allowing the axial indicator 200 to be flexibly adjusted according to the patient's specific femoral morphology and surgical needs. This design increases the adaptability and versatility of the osteotomer, enabling surgeons to make personalized adjustments based on different situations and ensure surgical outcomes.

[0070] In this application, the design of the axial indicator 200 simplifies the surgical procedure. The surgeon can quickly align the first rod 210 with the patient's femoral axis simply by adjusting the rotational position of the second rod 220 within the fixed sleeve 500. This design improves surgical efficiency, reduces surgical time, and lowers the patient's surgical risk.

[0071] Once the installation angle of the knee prosthesis is determined, to ensure that the rotating component 300 and the reference plate 400 maintain a preset angle relative to the osteotomy plate 100, and to ensure that the osteotomy plate 100 is accurately and properly installed on the femur, a more precise knee prosthesis installation position is cut into the femur. Figure 1 or Figure 2 As shown, in one embodiment, the extramedullary positioning distal femoral osteotomy device for knee replacement also includes a locking member 600, which is mounted on one end of the rotating member 300 near the fixed sleeve 500. The locking member 600 can lock the rotating member 300 to the fixed sleeve 500.

[0072] Locking the rotating component 300 to the fixing sleeve 500 with the locking element 600 ensures that the osteotomy plate 100 is positioned precisely on the femur. This is crucial for the installation position of the knee prosthesis, as even minor angular deviations can affect surgical outcomes and patient recovery.

[0073] For example, the locking member 600 includes a pin; a first insertion slot is provided on one end of the rotating member 300 near the fixed sleeve 500, and a plurality of second insertion slots are provided on the outer peripheral surface of the fixed sleeve 500. The pin is inserted into the first insertion slot and into one of the second insertion slots. The pin stops the rotating member 300 from rotating on the fixed sleeve 500, thereby locking the fixed sleeve 500 and the rotating member 300. The pin is inserted into different second insertion slots to adjust the rotation angle of the rotating member 300.

[0074] Unlike the locking member 600 in the above embodiments which includes a pin, in another embodiment, the locking member 600 includes a fixing clamp. The fixing clamp has two clamping plates that are hinged and arranged opposite each other, and an elastic member that drives the two clamping plates to generate relative movement or a tendency to generate relative movement. The fixing sleeve 500 is located between the jaws of the two clamping plates. The elastic member drives the two clamping plates to rotate so that the jaws close, thereby enabling the fixing clamp to clamp the fixing sleeve 500. One of the clamping plates is fixedly arranged on the rotating member 300 so that the rotating member 300 is fixedly connected to the fixing sleeve 500 through the fixing clamp.

[0075] Unlike the locking component 600 in the above embodiments, which includes a pin, as shown in the example... Figure 1 or Figure 2As shown, in one embodiment, the locking member 600 is a threaded rod. The rotating member 300 has a locking through hole on one end near the fixed sleeve 500 along the radial direction of the fixed sleeve 500. One end of the threaded rod is threaded into the locking through hole. Rotating the threaded rod causes it to move towards the fixed sleeve 500, and the threaded rod abuts against the fixed sleeve 500, thereby increasing the friction between the threaded rod and the fixed sleeve 500, so as to lock the rotating member 300 and the fixed sleeve 500.

[0076] For example, a nut is provided on the end of the threaded rod away from the fixed sleeve 500 to facilitate turning the threaded rod.

[0077] To prevent the reference plate 400 from slipping off the rotating part 300, such as Figure 1 or Figure 2 As shown, in one embodiment, the two ends of the rotating member 300 are a first end 310 and a second end 320, respectively. The first end 310 is rotatably mounted on the fixed sleeve 500, and the rotating member 300 rotates with the first end 310 as the rotation center.

[0078] For example, a sliding through hole is provided on the reference plate 400, and the second end 320 passes through the sliding through hole of the reference plate 400, so that the reference plate 400 and the second end 320 slide together.

[0079] like Figure 1 and Figure 2 As shown, a limiting protrusion 350 is provided on the second end 320. For example, the cross-sectional area of ​​the limiting protrusion 350 perpendicular to the length direction of the rotating member 300 is greater than the cross-sectional area of ​​the sliding through hole of the reference plate 400. The limiting protrusion 350 prevents the reference plate 400 from sliding off the second end 320.

[0080] For example, the limiting protrusion 350 is fixedly disposed on the second end 320 by means of welding, snap-fitting, gluing or integral molding.

[0081] To more accurately determine the rotation angle of the rotating component 300, such as Figure 1 or Figure 2 As shown, in one embodiment, the structure between the first end 310 and the second end 320 of the rotating member 300 is divided into a sliding section 330 and an indicator section 340, with the sliding section 330 close to the second end 320 and the indicator section 340 close to the first end 310.

[0082] like Figure 1 or Figure 2 As shown, reference plate 400 is slidably mounted on sliding section 330.

[0083] like Figure 1 or Figure 2As shown, a scale 140 corresponding to the rotation angle of the rotating member 300 is provided on the reference end face 110, and the projection of the indicator segment 340 on the reference end face 110 coincides with the scale 140 on the reference end face 110. The rotation angle of the rotating member 300 can be obtained according to the scale 140 corresponding to the position of the indicator segment 340.

[0084] In this application, the operator only needs to observe the overlap between the projection of the indicator segment 340 on the reference end face 110 and the scale 140 to quickly determine the rotation angle without complicated calculations or additional measuring tools.

[0085] like Figure 1 or Figure 2 As shown, in one embodiment, the end of the indicator segment 340 is smaller than the width of the indicator segment 340, so that the projection of the indicator segment 340 on the reference end face 110 is more consistent with the scale 140 on the reference end face 110, thereby improving the accuracy of measuring the rotation angle of the rotating member 300.

[0086] In this application, the rotating member 300 is divided into a sliding section 330 and an indicating section 340, and the rotation angle is measured by utilizing the coincidence of the projection of the indicating section 340 on the reference end face 110 with the scale 140. This design can more accurately determine the rotation angle of the rotating member 300. The end of the indicating section 340 is smaller than its width, resulting in a higher degree of fit between the projection and the scale 140, further improving the measurement accuracy.

[0087] like Figure 2 and Figure 3 As shown, in one embodiment, the sliding segment 330 is arranged along a straight line parallel to the reference end face 110, and one end of the sliding segment 330 near the indicator segment 340 can be projected onto the reference end face 110.

[0088] The distance between the sliding section 330 and the osteotomy plate 100 along the rotation axis of the sliding section 330 is H, and the minimum length of the reference plate 400 along the rotation axis of the sliding section 330 is L, where H < L. This design ensures that the osteotomy plate 100 can prevent the reference plate 400 from sliding from the sliding section 330 to the indicator section 340. This design ensures the stability and consistency of the mechanical structure during sliding and rotation.

[0089] like Figure 1 or Figure 2 As shown, in one embodiment, the reference plate 400 includes two sub-plates 410 with an observation gap 420 between them. During surgery, the surgeon can directly view the osteotomy site through the observation gap 420, ensuring the osteotomy operation matches the preoperative plan, thereby improving surgical precision.

[0090] For example, the size of the observation gap 420 can be set according to the actual needs of the surgical procedure.

[0091] like Figures 2 to 4 As shown, in one embodiment, the axial indicator 200 further includes a connecting plate 240 and a third rod 230. One end of the connecting plate 240 is connected to the second rod 220, and the other end of the connecting plate 240 is connected to the third rod 230. The third rod 230 is parallel to the first rod 210.

[0092] During use, measuring the femoral axis direction through the third rod 230 and the first rod 210 can provide more comprehensive measurement data, reduce errors caused by a single measurement, and further improve the accuracy of the measurement.

[0093] In another embodiment, one end of the connecting plate 240 is connected to the first rod 210, and the other end of the connecting plate 240 is connected to the third rod 230.

[0094] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0095] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An extramedullary femoral osteotomy device for knee replacement, characterized in that, include: Osteotomy plate (100), the osteotomy plate (100) has a reference end face (110) and an abutment end face that is parallel to and opposite to the reference end face (110). The reference end face (110) is provided with a bone cutting suture (120) and a nail hole (130) that penetrate the osteotomy plate (100). An axial indicator (200) is rotatably mounted on the reference end face (110) and the axis of rotation is perpendicular to the reference end face (110); A rotating component (300) is rotatably mounted on the reference end face (110) and its rotation axis is perpendicular to the reference end face (110); A reference plate (400) is slidably mounted on the rotating member (300). The reference plate (400) is capable of sliding on the rotating member (300) in a direction away from or close to the rotation axis of the rotating member (300). The reference plate (400) is perpendicular to the reference end face (110).

2. The extramedullary femoral osteotomy device for knee replacement according to claim 1, characterized in that, Also includes: A fixed sleeve (500) is vertically fixed on the reference end face (110) of the osteotomy plate (100). The axial indicator (200) is rotatably engaged with the fixed sleeve (500), and the rotating member (300) is rotatably engaged with the fixed sleeve (500).

3. The extramedullary femoral osteotomy device for knee replacement according to claim 2, characterized in that, The axial indicator (200) includes: The first rod (210) and the second rod (220) are arranged perpendicularly to each other. The second rod (220) is rotatably installed in the fixed sleeve (500). The first rod (210) is parallel to the reference end face (110).

4. The extramedullary femoral osteotomy device for knee replacement according to claim 2, characterized in that, Also includes: A locking element (600) is mounted on one end of the rotating element (300) near the fixed sleeve (500), and the locking element (600) enables the rotating element (300) to lock with the fixed sleeve (500).

5. The extramedullary femoral osteotomy device for knee replacement according to claim 4, characterized in that, The locking member (600) is a threaded rod. The rotating member (300) has a locking through hole on one end near the fixed sleeve (500) along the radial direction of the fixed sleeve (500). One end of the threaded rod is threaded into the locking through hole. Rotating the threaded rod causes it to move toward the fixed sleeve (500), and the threaded rod abuts against the fixed sleeve (500) to lock the rotating member (300) with the fixed sleeve (500).

6. The extramedullary femoral osteotomy device for knee replacement according to claim 1, characterized in that, The two ends of the rotating member (300) are a first end (310) and a second end (320), respectively. The rotating member (300) rotates with the first end (310) as the rotation center. A limiting protrusion (350) is provided on the second end (320). The limiting protrusion (350) prevents the reference plate (400) from slipping off the second end (320).

7. The extramedullary femoral osteotomy device for knee replacement according to claim 6, characterized in that, The structure between the first end (310) and the second end (320) of the rotating member (300) is divided into a sliding section (330) and an indicator section (340), the sliding section (330) being close to the second end (320) and the indicator section (340) being close to the first end (310); The reference plate (400) is slidably mounted on the sliding section (330); The reference end face (110) is provided with a scale (140) corresponding to the rotation angle of the rotating member (300), and the projection of the indicator segment (340) on the reference end face (110) coincides with the scale (140) on the reference end face (110).

8. The extramedullary femoral osteotomy device for knee replacement according to claim 7, characterized in that, The sliding segment (330) is arranged along a straight line parallel to the reference end face (110). One end of the sliding segment (330) near the indicator segment (340) can be projected onto the reference end face (110). The distance between the sliding segment (330) and the osteotomy plate (100) along the rotation axis of the sliding segment (330) is H. The minimum length of the reference plate (400) along the rotation axis of the sliding segment (330) is L, where H < L, so that the osteotomy plate (100) can prevent the reference plate (400) from sliding from the sliding segment (330) to the indicator segment (340).

9. The extramedullary femoral osteotomy device for knee replacement according to claim 1, characterized in that, The reference plate (400) includes two sub-plate bodies (410) with an observation gap (420) between them.

10. The extramedullary femoral osteotomy device for knee replacement according to claim 1, characterized in that, The axial indicator (200) also includes: A connecting plate (240) and a third rod (230) are provided. One end of the connecting plate (240) is connected to the first rod (210) or the second rod (220), and the other end of the connecting plate (240) is connected to the third rod (230). The third rod (230) is parallel to the first rod (210).

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