Femoral posterior condyle osteotomy positioning device

Abstract

The invention discloses a femur posterior condyle osteotomy positioning device which comprises a base, a first distraction piece, a second distraction piece and a positioning piece, the base comprises a supporting part and a platform part, and the supporting part is used for being connected to the top end of a soft tissue pressure measuring device. The first distraction piece comprises a first distraction part capable of supporting the posterior condyle of the femur, and the second distraction piece comprises a second distraction part capable of supporting the posterior condyle of the femur. The positioning piece comprises a main body part and a third pivot shaft, at least two first nail holes are formed in the main body part, and the main body part is connected with the platform part through the third pivot shaft. The first distraction piece and the second distraction piece can independently support the inner side and the outer side of the thighbone posterior condyle, a user can conveniently adjust the height of the inner side and the outer side of the thighbone posterior condyle so that soft tissue tension of the inner side and the outer side of the knee joint can be balanced, the soft tissue does not need to be loosened in the positioning process, and the positioning accuracy is improved. The original mechanical property of the soft tissue can be kept.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a positioning device for femoral posterior condyle osteotomy. Background Art

[0002] Total knee arthroplasty is a very effective means for treating knee joint-related diseases. Especially for diseases such as bone wear and osteoarthritis in elderly patients, it can relieve pain for patients, enable good functional reconstruction of the patient's knee joint, improve the state of the patient's knee joint, and improve the patient's quality of life. The key to knee arthroplasty is whether the osteotomy is precise and whether the soft tissue tension is balanced, and among them, osteotomy is of utmost importance. The precision of osteotomy determines whether the soft tissue tension of the knee joint is balanced. Precise osteotomy can effectively reduce soft tissue interference and keep the soft tissues of the patient as much as possible in their original mechanical functions.

[0003] Currently, in clinical practice, femoral posterior condyle osteotomy is generally performed by relying on experience and using an auxiliary tool to externally rotate by 3°. In the knee flexion state, the auxiliary tool is installed on the tibial plateau after osteotomy. The two bottom plates of the auxiliary tool are attached to the posterior condyle. First, the size of the femoral condyle is measured. After measuring the size of the femoral condyle, the angle is adjusted using the adjustment knob on the auxiliary tool. After the angle is adjusted, fixing pins can be driven to determine the position of the four-in-one osteotomy plate. Finally, the auxiliary tool is taken out and the fixing pins are retained, and the four-in-one osteotomy plate is installed on the two retained fixing pins for posterior condyle osteotomy. This method cannot ensure whether the soft tissue tension in the flexion state is balanced after osteotomy because this osteotomy method mainly still relies on past experience to perform osteotomy after externally rotating the posterior condyle by 3°. Subsequently, the soft tissues need to be released to adjust the tension to achieve the balance of the medial and lateral soft tissue tensions in the flexion state. The released soft tissues cannot maintain their original mechanical properties and will cause damage to the patient's soft tissues.

[0004] Robot osteotomy is also a method currently used in knee arthroplasty. Using robot osteotomy, osteotomy of the distal femur, anterior and posterior condyles, and two inclined planes can be completed at one time without the need to install and use other tools in the middle, which can largely liberate doctors from the operation and is simpler to operate than traditional tools. However, robot osteotomy can only ensure the osteotomy thickness in the maximum extension position and flexion position to the greatest extent, that is, the osteotomy thickness of the distal femur and the posterior condyle, and cannot take into account the soft tissue tension. Doctors have to rely on experience to handle the soft tissues in order to ensure the reliability after the prosthesis is installed. In addition, the preoperative preparation time for robot osteotomy is long, and the operation time is not shortened compared with traditional surgery, and the learning curve is long. At the same time, the cost of robot osteotomy is high and the surgical cost is high, which is a large expenditure for both hospitals and patients. Therefore, it cannot be widely promoted at present.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a posterior femoral condyle osteotomy positioning device, which is used to solve the problem that it is difficult to maintain a balance between the inner and outer tensions of soft tissue during the posterior femoral condyle osteotomy process.

[0007] In order to achieve the above-mentioned purpose, a specific embodiment of the present invention provides a posterior femoral condyle osteotomy positioning device, which is used to cooperate with a soft tissue pressure measuring device placed on the tibial platform, and the posterior femoral condyle osteotomy positioning device includes a base, a first distraction member, a second distraction member and a positioning member, the base includes a support portion for being placed in the knee joint gap and a platform portion located outside the knee joint gap, and the support portion is used to be connected to the top of the soft tissue pressure measuring device. The first distraction member includes a first distraction portion that can controllably support the posterior femoral condyle upward, the second distraction member includes a second distraction portion that can controllably support the posterior femoral condyle upward, one of the first distraction portion and the second distraction portion is used to contact the inner side of the posterior femoral condyle, and the other is used to contact the outer side of the posterior femoral condyle. The positioning member includes a main body and a third pivot axis pivotally connected to the main body and the platform portion. The pivot plane where the main body pivots around the third pivot axis is perpendicular to the extension direction of the third pivot axis. The pivot plane where the third pivot axis pivots around the platform portion is parallel to the extension direction of the third pivot axis and perpendicular to the surface of the distal face of the femur. At least two first nail holes facing the distal face of the femur are provided on the main body. The first nail holes are for the positioning nails to pass through and guide the positioning nails into the distal face of the femur.

[0008] In one or more embodiments of the present invention, the base includes a first supporting portion matched with the first opening portion and a second supporting portion matched with the second opening portion.

[0009] In one or more embodiments of the present invention, a positioning column is provided on the bottom surface of the support portion, and the positioning column is used to be inserted into the positioning hole of the soft tissue pressure measuring device.

[0010] In one or more embodiments of the present invention, a coupling groove is provided on the bottom surface of the support portion, and the coupling groove is used to accommodate a force-bearing column of the soft tissue pressure measuring device.

[0011] In one or more embodiments of the present invention, a first accommodating groove for accommodating the first opening portion is provided on a top surface of the supporting portion.

[0012] In one or more embodiments of the present invention, a second accommodating groove for accommodating the second opening portion is provided on the top surface of the supporting portion.

[0013] In one or more embodiments of the present invention, both the first spreading member and the second spreading member are pivotally connected to the platform portion.

[0014] In one or more embodiments of the present invention, the femoral posterior condyle osteotomy positioning device further includes a first operating member cooperating with the first spreading member, and the first operating member can controllably drive the first spreading member to pivot.

[0015] In one or more embodiments of the present invention, the femoral posterior condyle osteotomy positioning device further includes a second operating member cooperating with the second spreading member, and the second operating member can controllably drive the second spreading member to pivot.

[0016] In one or more embodiments of the present invention, the moving direction of the first operating member is perpendicular to the first pivot axis of the first spreading member. An upper inclined surface at the proximal end of the first spreading member is formed with a first guiding surface for contacting the distal end of the first operating member, and the first guiding surface cooperates with the first operating member to convert the linear motion of the first operating member into the pivoting motion of the first spreading member.

[0017] In one or more embodiments of the present invention, the moving direction of the second operating member is perpendicular to the second pivot axis of the second spreading member. An upper inclined surface at the proximal end of the second spreading member is formed with a second guiding surface for contacting the distal end of the second operating member, and the second guiding surface cooperates with the second operating member to convert the linear motion of the second operating member into the pivoting motion of the second spreading member.

[0018] In one or more embodiments of the present invention, the first guiding surface is configured as a plane, and the end surface of the distal end of the first operating member is configured as an arc surface.

[0019] In one or more embodiments of the present invention, the second guiding surface is configured as a plane, and the end surface of the distal end of the second operating member is configured as an arc surface.

[0020] In one or more embodiments of the present invention, a connecting groove is formed at the top end of the platform portion. The bottom end of the third pivot axis is pivotally connected in the connecting groove and can also be controllably moved closer to or away from the distal surface of the femur along the connecting groove.

[0021] In one or more embodiments of the present invention, the connecting groove includes a bottom groove section and a top groove section that are connected and communicate with each other. The width of the bottom groove section is greater than the width of the top groove section.

[0022] In one or more embodiments of the present invention, a first pivot portion with a central axis parallel to the horizontal plane is formed at the bottom end of the third pivot axis, and a second pivot portion perpendicular to the first pivot portion is formed at the top end. The first pivot portion is installed in the bottom groove section, and the second pivot portion is installed in the top groove section and extends out from the top of the top groove section.

[0023] In one or more embodiments of the present invention, the main body portion includes a plurality of pairs of first nail holes arranged in pairs.

[0024] In one or more embodiments of the present invention, the posterior femoral condyle osteotomy positioning device also includes a posterior femoral condyle osteotomy plate, which is installed to the distal surface of the femur by means of positioning pins driven into the distal surface of the femur, and the posterior femoral condyle osteotomy plate includes an osteotomy groove, which is used to cooperate with an osteotomy tool to cut the posterior femoral condyle.

[0025] In one or more embodiments of the present invention, the posterior femoral condyle osteotomy positioning device also includes a posterior condyle bearing component, which is used to be placed in the knee joint space after cutting the posterior femoral condyle. The top surface of the posterior condyle bearing component is used to contact the posterior femoral condyle after osteotomy, and the bottom surface is used to contact the tibial platform. The posterior condyle bearing component includes a positioning plate that cooperates with the four-in-one osteotomy plate.

[0026] Compared with the prior art, the first distraction member and the second distraction member of the present invention can independently support the inner side and the outer side of the posterior femoral condyle, making it convenient for the user to adjust the height of the inner and outer sides of the posterior femoral condyle so that the tension of the soft tissues on the inner and outer sides of the knee joint is balanced. There is no need to loosen the soft tissues during the positioning process, and the soft tissues can retain their original mechanical properties.

[0027] Furthermore, after the tension of the soft tissues on the inside and outside of the knee joint is balanced, the osteotomy position of the posterior femoral condyle can be quickly determined through the nail holes on the positioning piece, without the need to use other auxiliary tools to measure the distance between the posterior femoral condyle and the tibial plateau to infer the osteotomy position.

[0028] In addition, when the main body pivots around the third pivot axis, the distance between the main body and the inner and outer sides of the femoral distal surface can be adjusted. When the main body pivots around the platform portion following the third pivot axis, the main body can be fitted with the femoral distal surface, so as to facilitate the subsequent driving of the positioning nail into the femoral distal surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a three-dimensional structural diagram of a posterior femoral condyle osteotomy positioning device in one embodiment of the present invention;

[0031] Figure 2 It is a side structural diagram of a posterior femoral condyle osteotomy positioning device in one embodiment of the present invention;

[0032] Figure 3 It is a cross-sectional structural diagram of a posterior femoral condyle osteotomy positioning device in one embodiment of the present invention;

[0033] Figure 4 It is an exploded structural diagram of a posterior femoral condyle osteotomy positioning device in one embodiment of the present invention;

[0034] Figure 5 It is a partial exploded structural diagram of a posterior femoral condyle osteotomy positioning device in one embodiment of the present invention;

[0035] Figure 6 It is a three-dimensional structural diagram of the first spreading member and the second spreading member in one embodiment of the present invention;

[0036] Figure 7 An exploded structural diagram of a base and a positioning member in one embodiment of the present invention;

[0037] Figure 8 An exploded structural diagram of a positioning member in one embodiment of the present invention;

[0038] Figure 9 A three-dimensional structural diagram of a posterior condylar osteotomy plate in one embodiment of the present invention;

[0039] Figure 10 It is a three-dimensional structural diagram of a posterior condyle bearing member in one embodiment of the present invention;

[0040] Figure 11 This is a working diagram of a posterior femoral condyle osteotomy positioning device in one embodiment of the present invention;

[0041] Figure 12 This is a working state diagram of a posterior femoral condyle osteotomy positioning device in one embodiment of the present invention;

[0042] Figure 13 This is a working state diagram of a posterior condylar osteotomy plate in one embodiment of the present invention;

[0043] Figure 14 This is a schematic diagram of the posterior femoral condyle after osteotomy;

[0044] Figure 15 1 is a diagram showing the working state of the posterior condyle bearing member in one embodiment of the present invention.

[0045] Description of Main Reference Numerals: 1. Base, 11. Support Portion, 111. First Support Portion, 1111. First Accommodating Groove, 112. Second Support Portion, 1121. Second Accommodating Groove, 12. Platform Portion, 121. Connecting Groove, 1211. Bottom Groove Segment, 1212. Top Groove Segment, 13. Limiting Portion, 131. First Limiting Portion, 1311. First Limiting Groove, 1312. First Threaded Hole, 132. Second Limiting Portion, 1321. Second Limiting Groove, 1322. Second Threaded Hole, 14. Positioning Post, 141. First Positioning Post, 142. Second Positioning Post, 15. Combining Groove, 151. First Combining Groove, 152. Second Combining Groove, 2. First Expanding Member, 21. First Expanding Portion, 22. First Pivoting Portion, 221. First Axle Hole, 23. First Driving Portion, 231. First Guiding Surface, 24. First Pivoting Shaft, 3. Second Expanding Member, 31. Second Expanding Portion, 32. Second Pivoting Portion, 321. Second Axle Hole, 33. Second Driving Portion, 331. Second Guiding Surface, 34. Second Pivoting Shaft, 4. Positioning Member, 41. Main Body Portion, 411. Flat Plate, 412. Protrusion, 4121. First Nail Hole, 42. Third Pivoting Shaft, 421. First Pivoting Portion, 422. Second Pivoting Portion, 43. Handle, 5. First Operating Member, 51. First Stud Portion, 52. First Ball Portion, 6. Second Operating Member, 61. Second Stud Portion, 62. Second Ball Portion, 7. Posterior Condylar Osteotomy Plate, 71. Second Nail Hole, 72. Osteotomy Groove, 8. Posterior Condylar Bearing Member, 81. Positioning Plate, a. Distal Femoral Surface, b. Posterior Condyle of Femur, c. Tibial Plateau. Detailed Embodiment

[0046] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0048] The term "proximal end" refers to the end close to the user when the user operates the femoral posterior condylar osteotomy positioning device during the operation, and the term "distal end" refers to the end far from the user when the user operates the femoral posterior condylar osteotomy positioning device during the operation.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0050] In one embodiment, with reference to Figures 1 to 4 As shown, the present invention provides a femoral posterior condyle osteotomy positioning device. During knee joint replacement, the knee joint is in a flexed state, the angle between the femur and the tibia is approximately 90°, and a femoral distal surface a has been formed on the femur and a tibial plateau c has been formed on the tibia through an osteotomy tool. At this time, the angle between the surface of the femoral distal surface a and the tibial plateau c is approximately 90°. A soft tissue pressure measuring device is placed on the tibial plateau c. After the femoral posterior condyle osteotomy positioning device is matched with the soft tissue pressure measuring device, the soft tissue tension on the inner and outer sides of the knee joint can be measured through the soft tissue pressure measuring device. The soft tissue pressure measuring device can be a measuring device that can be purchased on the market or a measuring device that can be self-manufactured according to the existing technology. Specifically, the knee joint soft tissue pressure measuring device described in the Chinese patent with the publication number CN111419253A can be selected.

[0051] The femoral posterior condyle osteotomy positioning device includes a base 1, a first spreader 2, a second spreader 3, a positioning member 4, a first operating member 5 and a second operating member 6 assembled into one body. The base 1 includes a support portion 11 for placing into the knee joint space and a platform portion 12 located outside the knee joint space. The support portion 11 is used to connect to the top of the soft tissue pressure measuring device. Both the first spreader 2 and the second spreader 3 are connected to the base 1. The first spreader 2 and the second spreader 3 can both move upward relative to the support portion 11 of the base 1 to change the distance between the first spreader 2 and the second spreader 3 and the support portion 11, and their movement states are independent of each other. When the support portion 11, the first spreader 2 and the second spreader 3 are placed into the knee joint space together, the first spreader 2 and the second spreader 3 can lift the femoral posterior condyle b to expand the flexion space of the knee joint. One of the first spreader 2 and the second spreader 3 contacts the inner side of the femoral posterior condyle b, and the other contacts the outer side of the femoral posterior condyle b. Whether the soft tissue tension on the inner and outer sides of the femoral posterior condyle b is balanced can be detected through the soft tissue pressure measuring device. If the soft tissue tension on the inner and outer sides is unbalanced, the height of the inner and outer sides of the femoral posterior condyle b spread by the first spreader 2 and the second spreader 3 can be adjusted to adjust the soft tissue tension on the inner and outer sides.

[0052] The positioning member 4 is pivotally connected to the base 1. During the surgical procedure, it is located outside the knee joint space and is used to determine the position where the positioning pin is inserted into the distal end surface a of the femur. The first operating member 5 and the second operating member 6 are also connected to the base 1. The first operating member 5 cooperates with the first spreading member 2 and is responsible for controlling the movement state of the first spreading member 2. The second operating member 6 cooperates with the second spreading member 3 and is responsible for controlling the movement state of the second spreading member 3.

[0053] In one embodiment, referring to Figures 1 to 5 As shown, the base 1 includes a support portion 11, a platform portion 12, and a limiting portion 13 that are integrally formed and arranged in sequence from far to near. The support portion 11 is used to be placed into the knee joint space and is placed on the top of the soft tissue pressure measuring device. The platform portion 12 and the limiting portion 13 are located outside the knee joint space. The platform portion 12 is used to connect the first spreading member 2 and the second spreading member 3, and is also used to support the positioning member 4 that can move up and down relative to it. The limiting portion 13 is composed of a first limiting portion 131 and a second limiting portion 132. The first limiting portion 131 is used to install the first operating member 5 and limit its moving direction. The second limiting portion 132 is used to install the second operating member 6 and limit its moving direction, facilitating the user to control the first operating member 5 and the second operating member 6 from outside the knee joint space.

[0054] The support portion 11 is composed of a first support portion 111 and a second support portion 112. The first support portion 111 and the second support portion 112 are configured as plate-like structures and are spaced apart to avoid the soft tissues in the knee joint space. Moreover, the first support portion 111 cooperates with the first spreading member 2, and the second support portion 112 cooperates with the second spreading member 3.

[0055] The bottom surface of the support portion 11 is provided with positioning posts 14 that cooperate with the soft tissue pressure measuring device. The positioning posts 14 are used to be inserted into the positioning holes of the soft tissue pressure measuring device. Specifically, the positioning posts 14 are composed of a first positioning post 141 and a second positioning post 142. The first positioning post 141 is arranged on the bottom surface of the first support portion 111, and the second positioning post 142 is arranged on the bottom surface of the second support portion 112. The number of the first positioning post 141 and the second positioning post 142 can be set according to the number of the positioning holes of the soft tissue pressure measuring device.

[0056] The bottom surface of the support portion 11 is provided with a coupling groove 15 that cooperates with the soft tissue pressure measuring device. The coupling groove 15 is used to accommodate the force-receiving column of the soft tissue pressure measuring device. After the coupling groove 15 is combined with the force-receiving column, the acting force can be transmitted between the support portion and the force-receiving column, facilitating the measurement of soft tissue tension by measuring elements such as strain gauges that cooperate with the force-receiving column. The coupling groove 15 is specifically composed of a first coupling groove 151 and a second coupling groove 152. Among them, the first coupling groove 151 is recessed in the bottom surface of the first support portion 111, and the second coupling groove 152 is recessed in the bottom surface of the second support portion 112. The number of the first coupling groove 151 and the second coupling groove 152 can be set according to the number of the force-receiving columns of the soft tissue pressure measuring device.

[0057] In one embodiment, referring to Figures 4 to 6 As shown, the first spreader 2 is pivotally connected to the platform portion 12, and the distance between the first spreader 2 and the first support portion 111 is adjusted by pivotal movement.

[0058] The first spreader 2 includes a first spreading portion 21, a first pivot portion 22, and a first driving portion 23 that are integrally connected and arranged in sequence from far to near. The first spreading portion 21 is configured as a plate-like structure and is used to be placed into the knee joint space and cooperate with the first support portion 111 to expand the knee joint space. A first accommodation groove 1111 penetrating through it is provided on the top surface of the first support portion 111. The shape of the first accommodation groove 1111 is adapted to the shape of the first spreading portion 21, and is used to accommodate the first spreading portion 21 in the first accommodation groove 1111, facilitating the simultaneous placement of the first support portion 111 and the first spreading portion 21 into the knee joint space. A first shaft hole 221 is opened on the first pivot portion 22, and a first pivot shaft 24 connected to the platform portion 12 is arranged in the first shaft hole 221. The first driving portion 23 is bent downward relative to the first spreading portion 21 and extends into a first limit groove 1311 at the bottom end of the first limiting portion 131.

[0059] A first threaded hole 1312 communicating with the first limit groove 1311 is recessed in the end face of the proximal end of the first limiting portion 131, and the first operating member 5 is screwed into the first threaded hole 1312 from the proximal end of the first threaded hole 1312. The moving direction of the first operating member 5 is perpendicular to the first pivot shaft 24. During the process of the first operating member 5 moving along the first threaded hole 1312, the first operating member 5 approaches the first driving portion 23, and the first ball portion 52 successively contacts the first guiding surface 231 and the upper inclined surface of the first driving portion 23. While the first ball portion 52 climbs along the upper inclined surface of the first driving portion 23, it drives the proximal end of the first spreader 2 to sink and the distal end to rise.

[0060] Referring to Figure 5 and Figure 6As shown, a first guiding surface 231 for contacting the distal end of the first operating member 5 is formed at the proximal end of the first driving portion 23 (i.e., the proximal end of the first spreading member 2). The first guiding surface 231 is specifically formed at the upper inclined surface at the proximal end of the first driving portion 23. The first guiding surface 231 is configured as a plane and has an angle with the horizontal plane. When the end surface of the proximal end of the first driving portion 23 is parallel to the horizontal plane, the angle between the first guiding surface 231 and the horizontal plane is approximately 38°. The first guiding surface 231 cooperates with the first operating member 5 to convert the linear motion of the first operating member 5 into the pivoting motion of the first spreading member 2.

[0061] The first operating member 5 includes a first stud portion 51 and a first ball portion 52 provided at the distal end of the first stud portion 51. The first stud portion 51 is threadedly connected to the first threaded hole 1312. The first ball portion 52 makes the end surface of the distal end of the first operating member 5 form an arc surface. When the arc surface cooperates with the first guiding surface 231, it can reduce the friction between the first operating member 5 and the first driving portion 23 and reduce the operation difficulty of lifting the posterior condyle b of the femur upward.

[0062] In other alternative embodiments, the first ball portion 52 can also be set to a structure similar to an ellipsoidal portion or a hemispherical portion, etc., which can also form an arc surface at the distal end of the first operating member 5.

[0063] A hexagonal hole that can cooperate with a hexagonal wrench is provided at the end surface of the proximal end of the first stud portion 51, which is convenient for the user to turn the first operating member 5.

[0064] In one embodiment, referring to Figures 4 to 6 As shown, the second spreading member 3 is similar in structure to the first spreading member 2 and is basically symmetrically arranged.

[0065] The second spreading member 3 includes a second spreading portion 31, a second pivoting portion 32, and a second driving portion 33 that are integrally connected and arranged in sequence from far to near. The second spreading portion 31 is configured as a plate-like structure for being placed into the knee joint space. A second receiving groove 1121 penetrating through the top surface of the second supporting portion 112 is provided. The shape of the second receiving groove 1121 is adapted to the shape of the first spreading portion 21 for receiving the second spreading portion 31 in the second receiving groove 1121, which is convenient for simultaneously placing the second supporting portion 112 and the second spreading portion 31 into the knee joint space.

[0066] A second shaft hole 321 is provided on the second pivoting portion 32, and a second pivot shaft 34 connected to the platform portion 12 is arranged in the second shaft hole 321. The second driving portion 33 bends downward relative to the second spreading portion 31 and extends into the second limiting groove 1321 at the bottom end of the second limiting portion 132.

[0067] A second threaded hole 1322 communicating with the second limiting groove 1321 is recessed in the end face at the proximal end of the second limiting portion 132. The second operating member 6 is screwed into the second threaded hole 1322 from the proximal end of the second threaded hole 1322. The moving direction of the second operating member 6 is perpendicular to the second pivot shaft 34. During the process of the second operating member 6 moving along the second threaded hole 1322, the second operating member 6 approaches the second driving portion 33, and the second spherical portion 62 successively contacts the second guiding surface 331 and the upper inclined surface of the second driving portion 33. While the second spherical portion 62 climbs along the upper inclined surface of the second driving portion 33, the proximal end of the second spreading member 3 sinks, and the distal end rises.

[0068] Referring Figure 5 and Figure 6 As shown, a second guiding surface 331 for contacting the distal end of the second operating member 6 is formed at the proximal end of the second driving portion 33 (i.e., the proximal end of the second spreading member 3). The second guiding surface 331 is specifically formed at the upper inclined surface at the proximal end of the second driving portion 33. The second guiding surface 331 is configured as a plane and has an angle with the horizontal plane. When the end face of the proximal end of the second driving portion 33 is parallel to the horizontal plane, the angle between the second guiding surface 331 and the horizontal plane is approximately 38°. The second guiding surface 331 cooperates with the second operating member 6 to convert the linear motion of the second operating member 6 into the pivoting motion of the second spreading member 3.

[0069] The second operating member 6 includes a second stud portion 61 and a second spherical portion 62 provided at the distal end of the second stud portion 61. The second stud portion 61 is threadedly connected to the second threaded hole 1322. The second spherical portion 62 makes the end face at the distal end of the second operating member 6 form an arc surface. When the arc surface cooperates with the second guiding surface 331, the friction between the second operating member 6 and the second driving portion 33 can be reduced, and the operation difficulty of lifting the posterior condyle b of the femur upward can be lowered.

[0070] In other alternative embodiments, the second spherical portion 62 can also be set to a structure similar to an ellipsoidal portion or a hemispherical portion, etc., which can also form an arc surface at the distal end of the second operating member 6.

[0071] A hexagonal hole capable of cooperating with a hexagonal wrench is provided in the end face at the proximal end of the second stud portion 61, which is convenient for the user to screw the second operating member 6.

[0072] In other alternative embodiments, the first spreading member 2 can also be moved upward by a threaded connection method. Specifically, a first screw rod threadedly connected to the first spreading member 2 can be provided outside the knee joint space. The central axis of the first screw rod is parallel to the vertical direction. When the first screw rod is rotated, the first spreading member 2 can be driven to move upward and lift the posterior condyle b of the femur.

[0073] Similarly, a second screw rod similar to the structure of the first screw rod can also be provided, and the second spreading member 3 can be driven to move upward and lift the posterior condyle b of the femur by rotating the second screw rod.

[0074] In one embodiment, referring to Figure 3 , Figure 7 and Figure 8 as shown, the positioning member 4 is pivotally connected to the top end of the platform portion 12. At least two first nail holes 4121 are formed in the positioning member 4 and face the distal femoral end surface a. The first nail holes 4121 are for positioning nails to pass through and guide the positioning nails into the distal femoral end surface a. The positioning member 4 can be controllably pivoted around its connection with the platform portion 12 to fit the distal femoral end surface a.

[0075] The positioning member 4 includes a main body portion 41 and a third pivot shaft 42. The third pivot shaft 42 is configured in a T-shaped structure. Its bottom end forms a first pivot portion 421 with a central axis parallel to the horizontal plane, and its top end forms a second pivot portion 422 perpendicular to the first pivot portion 421. A connection groove 121 is formed at the top end of the platform portion 12. The cross-section of the connection groove 121 is generally T-shaped. The connection groove 121 is composed of a bottom groove section 1211 and a top groove section 1212. Among them, the bottom groove section 1211 of the connection groove 121 is relatively wider and is used to accommodate and install the first pivot portion 421. The top groove section 1212 of the connection groove 121 is relatively narrower and is used to accommodate and install the second pivot portion 422, and allows the second pivot portion 422 to extend out of the connection groove 121 from its top. It should be noted that the widths of the above bottom groove section 1211 and top groove section 1212 refer to their horizontal widths in the cross-sectional view as shown in Figure 3 as shown.

[0076] The main body portion 41 includes a flat plate 411 and two protrusions 412 protruding upward from the flat plate 411. The flat plate 411 is connected to the second pivot portion 422 of the third pivot shaft 42. First nail holes 4121 are provided on both of the two protrusions 412. A handle 43 is further provided at the proximal end of the flat plate 411. The user can quickly fine-tune the position of the main body portion 41 through the handle 43.

[0077] According to the above structural design, the pivot plane where the main body portion 41 pivots around the third pivot shaft 42 is perpendicular to the extension direction of the third pivot shaft 42, that is, the main body portion 41 can pivot substantially on the horizontal plane to adjust the distances between the main body portion 41 and the inner and outer sides of the distal femoral end surface a.

[0078] The pivot plane where the third pivot shaft 42 pivots around the platform portion 12 is parallel to the extension direction of the third pivot shaft 42 and perpendicular to the surface of the distal femoral end surface a. When the main body portion 41 follows the third pivot shaft 42 to pivot, the main body portion 41 can be made to fit the distal femoral end surface a, so as to facilitate driving the positioning nail into the distal femoral end surface a subsequently.

[0079] One end of the connecting groove 121 penetrates through the end face of the distal end of the platform portion 12. The first pivot portion 421 of the third pivot shaft 42 can be controllably moved along the connecting groove 121, so that the main body portion 41 approaches or moves away from the distal femoral end face a, and the distance between the main body portion 41 and the distal femoral end face a is adjusted.

[0080] The main body portion 41 includes three pairs of first nail holes 4121. The two first nail holes 4121 of each pair are respectively used for the inner side and the outer side facing the distal femoral end face a. Moreover, the heights of the two first nail holes 4121 of each pair are different.

[0081] Corresponding size markings are provided at each pair of first nail holes 4121. Different size markings represent different sizes of the knee joint extension gap. The size markings can be specifically set to 18mm, 19mm, and 20mm respectively.

[0082] Refer to Figure 9 and Figure 10 As shown, the femoral posterior condyle osteotomy positioning device further includes a posterior condyle osteotomy plate 7 and a posterior condyle carrier 8 which are separately arranged from the above structure.

[0083] An osteotomy groove 72 and at least two second nail holes 71 are provided on the posterior condyle osteotomy plate 7. When the posterior condyle osteotomy plate 7 is installed on the distal femoral end face a, the distance between the upper edge of the osteotomy groove 72 and the tibial plateau c is the knee joint flexion gap. The second nail holes 71 are arranged in one-to-one correspondence with the first nail holes 4121. The second nail holes 71 are used to cooperate with the positioning nails after they are driven into the distal femoral end face a, and the osteotomy groove 72 is used to cooperate with an osteotomy tool to cut the femoral posterior condyle b.

[0084] In addition, it should be noted that the sizes corresponding to the size markings of the above first nail holes 4121 are not equal to the distances between the first nail holes 4121 and the tibial plateau c. What the size markings of the first nail holes 4121 actually represent is: after driving the positioning nails into the distal femoral end face a through the first nail holes 4121, and then installing the corresponding posterior condyle osteotomy plate 7 on the distal femoral end face a through the positioning nails, the distance (knee joint flexion gap) between the upper edge of the osteotomy groove 72 and the tibial plateau c at this time is equal to the size (knee joint extension gap) corresponding to the size markings of the first nail holes 4121.

[0085] The posterior condyle bearing member 8 is used to be inserted into the knee joint after cutting the posterior condyle b of the femur. The posterior condyle bearing member 8 is roughly an I-shaped structure, that is, the posterior condyle bearing member 8 is composed of a top plate, a bottom plate, and a vertical plate connecting the top plate and the bottom plate. The top surface of the posterior condyle bearing member 8 is used to contact the posterior condyle b of the femur after osteotomy, and the bottom surface is used to contact the tibial plateau c. A positioning plate 81 that matches the four-in-one osteotomy plate is formed on the posterior condyle bearing member 8. The positioning plate 81 is used to insert the four-in-one osteotomy plate, and then the four-in-one osteotomy plate is temporarily fixed on the posterior condyle bearing member 8, so that the anterior condyle of the femur, the medial condyle of the femur, and the lateral condyle of the femur are osteotomized laterally. In addition, the top plate and the bottom plate of the posterior condyle bearing member 8 are close to the side of the soft tissue and are provided with a avoidance groove for avoiding the soft tissue.

[0086] The positioning plate 81 can be arranged at any position of the posterior condyle bearing member 8, as long as the positioning plate 81 is ensured to be located outside the knee joint space.

[0087] Preferably, the positioning plate 81 can be disposed on the top plate of the posterior condyle bearing component 8 and formed integrally with the top plate.

[0088] Reference Figures 11 to 15 As shown, the steps of using the posterior femoral condyle osteotomy positioning device provided by the present invention are as follows:

[0089] A. Preparatory steps before positioning the posterior femoral condyle osteotomy

[0090] (1) Measure the extension gap L (the distance between the distal femoral surface a and the tibial plateau c) when the knee is in extended state.

[0091] (2) Adjust the knee joint to a flexed state and place a soft tissue pressure measurement device on the tibial plateau c.

[0092] B. Steps for positioning the posterior femoral condyle osteotomy

[0093] (1) The first supporting part 111, the second supporting part 112, the first distracting part 21 and the second distracting part 31 are placed into the knee joint gap, and the first supporting part 111 and the second supporting part 112 are connected to the top end of the soft tissue pressure measuring device.

[0094] (2) The first operating member 5 and the second operating member 6 are respectively screwed, and one of the first distraction portion 21 and the second distraction portion 31 contacts the inner side of the posterior femoral condyle b, and the other contacts the outer side of the posterior femoral condyle b, and the two distraction portions support the inner side and the outer side of the posterior femoral condyle b upward.

[0095] (3) Determine whether the tension on the inner and outer sides of the knee joint is balanced based on the measurement data of the soft tissue pressure measuring device. If the tension is balanced, stop screwing the first operating member 5 and the second operating member 6; if the tension is not balanced, adjust the degree of distraction on the corresponding side of the posterior femoral condyle b according to the tension difference until the tension on the inner and outer sides of the knee joint is balanced.

[0096] (4) After the tension on the inside and outside of the knee joint is balanced, drive the two positioning pins into the pin holes marked with corresponding scales. For example, if L = 18 mm, drive the two positioning pins into the two pin holes marked with a size of 18 mm.

[0097] (5) The first supporting portion 111, the second supporting portion 112, the first distracting portion 21 and the second distracting portion 31 are removed from the knee joint gap, and the positioning member 4 is removed simultaneously, leaving two positioning pins on the distal end surface a of the femur.

[0098] (6) Align the two second nail holes 71 of the posterior condyle osteotomy plate 7 with the two positioning nails on the distal surface a of the femur, and install the posterior condyle osteotomy plate 7 onto the two positioning nails. At this time, the upper edge of the osteotomy groove 72 of the posterior condyle osteotomy plate 7 is the osteotomy position of the posterior condyle b of the femur.

[0099] C. Osteotomy steps of the posterior femoral condyle

[0100] (1) Insert the saw blade of the osteotomy tool into the upper edge of the osteotomy groove 72 of the posterior condyle osteotomy plate 7 to perform osteotomy on the posterior femoral condyle b.

[0101] (2) After the osteotomy of the posterior femoral condyle b is completed, the posterior condyle osteotomy plate 7 is removed, and the positioning pins are removed from the distal surface a of the femur.

[0102] D. Osteotomy steps for other parts of the femur

[0103] (1) The posterior condyle bearing component 8 is placed in the knee joint space so that its top surface contacts the posterior femoral condyle b after osteotomy and its bottom surface contacts the tibial plateau c.

[0104] (2) Align the positioning groove of the four-in-one osteotomy plate with the positioning plate 81 of the posterior condyle bearing component 8 and install the four-in-one osteotomy plate onto the posterior condyle bearing component 8.

[0105] (3) The osteotomy positions of the anterior femoral condyle, medial femoral condyle, and lateral femoral condyle are determined using the four-in-one osteotomy plate, and osteotomy tools are used to perform osteotomy on the above-mentioned sites.

[0106] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0107] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A posterior femoral condyle osteotomy positioning device, the posterior femoral condyle osteotomy positioning device is used to cooperate with a soft tissue pressure measuring device placed on a tibial plateau (c), characterized in that: The posterior femoral condyle osteotomy positioning device comprises: A base (1) comprising a support portion (11) for placement in the knee joint gap and a platform portion (12) located outside the knee joint gap, wherein the support portion (11) is used to be connected to the top end of the soft tissue pressure measuring device; A first distraction member (2) and a second distraction member (3), wherein the first distraction member (2) comprises a first distraction portion (21) which can controllably distract the posterior condyle (b) of the femur upward, and the second distraction member (3) comprises a second distraction portion (31) which can controllably distract the posterior condyle (b) of the femur upward, wherein one of the first distraction portion (21) and the second distraction portion (31) is used to contact the inner side of the posterior condyle (b) of the femur, and the other is used to contact the outer side of the posterior condyle (b) of the femur; A positioning member (4), comprising a main body (41) and a third pivot axis (42) pivotally connected to the main body (41) and the platform (12); the pivot plane of the main body (41) when pivoting around the third pivot axis (42) is perpendicular to the extension direction of the third pivot axis (42); the pivot plane of the third pivot axis (42) when pivoting around the platform (12) is parallel to the extension direction of the third pivot axis (42) and perpendicular to the surface of the distal end face (a) of the femur; at least two first nail holes (4121) facing the distal end face (a) of the femur are provided on the main body (41); the first nail holes (4121) are for the positioning nails to pass through and guide the positioning nails into the distal end face (a) of the femur.

2. The posterior femoral condyle osteotomy positioning device according to claim 1, characterized in that: The base (1) comprises a first supporting portion (111) matched with the first opening portion (21) and a second supporting portion (112) matched with the second opening portion (31); and / or, The bottom surface of the support portion (11) is provided with a positioning column (14), and the positioning column (14) is used to be inserted into a positioning hole of a soft tissue pressure measuring device; and / or, The bottom surface of the support portion (11) is provided with a coupling groove (15), and the coupling groove (15) is used to accommodate a force-bearing column of a soft tissue pressure measuring device; and / or, The top surface of the support portion (11) is provided with a first accommodating groove (1111) for accommodating the first opening portion (21); and / or, The top surface of the support portion (11) is provided with a second accommodating groove (1121) for accommodating the second opening portion (31).

3. The posterior femoral condyle osteotomy positioning device according to claim 1, characterized in that: The first spreading member (2) and the second spreading member (3) are both pivotally connected to the platform portion (12).

4. The posterior femoral condyle osteotomy positioning device according to claim 3, characterized in that: The posterior femoral condyle osteotomy positioning device further comprises a first operating member (5) matched with the first distraction member (2), wherein the first operating member (5) can controllably drive the first distraction member (2) to pivot; The posterior femoral condyle osteotomy positioning device further comprises a second operating member (6) matched with the second distraction member (3), and the second operating member (6) can controllably drive the second distraction member (3) to pivot.

5. The posterior femoral condyle osteotomy positioning device according to claim 4, characterized in that: The moving direction of the first operating member (5) is perpendicular to the first pivot axis (24) of the first spreading member (2); the upper inclined surface of the proximal end of the first spreading member (2) is formed with a first guide surface (231) for contacting the distal end of the first operating member (5); the first guide surface (231) cooperates with the first operating member (5) to convert the linear motion of the first operating member (5) into the pivotal motion of the first spreading member (2); The moving direction of the second operating member (6) is perpendicular to the second pivot axis (34) of the second spreading member (3); the upper inclined surface of the proximal end of the second spreading member (3) is formed with a second guide surface (331) for contacting the distal end of the second operating member (6); the second guide surface (331) cooperates with the second operating member (6) to convert the linear motion of the second operating member (6) into the pivotal motion of the second spreading member (3).

6. The posterior femoral condyle osteotomy positioning device according to claim 5, characterized in that: The first guide surface (231) is configured as a plane, and the end surface of the distal end of the first operating member (5) is configured as a curved surface; The second guide surface (331) is configured as a plane, and the end surface of the distal end of the second operating member (6) is configured as a curved surface.

7. The posterior femoral condyle osteotomy positioning device according to claim 1, characterized in that: A connecting groove (121) is provided at the top of the platform portion (12), and the bottom end of the third pivot shaft (42) is pivotally connected in the connecting groove (121) and can also be controlled to approach or move away from the distal end surface (a) of the femur along the connecting groove (121).

8. The posterior femoral condyle osteotomy positioning device according to claim 7, characterized in that: The connecting groove (121) comprises a bottom groove section (1211) and a top groove section (1212) which are connected to each other, and the width of the bottom groove section (1211) is greater than the width of the top groove section (1212); The third pivot shaft (42) has a first pivot portion (421) whose central axis is parallel to the horizontal plane at the bottom end, and a second pivot portion (422) perpendicular to the first pivot portion (421) at the top end, wherein the first pivot portion (421) is installed in the bottom slot section (1211), and the second pivot portion (422) is installed in the top slot section (1212) and is led out from the top of the top slot section (1212).

9. The posterior femoral condyle osteotomy positioning device according to claim 1, characterized in that: The posterior femoral condyle osteotomy positioning device also includes a posterior femoral condyle osteotomy plate (7), which is installed on the distal femoral surface (a) by means of a positioning nail driven into the distal femoral surface (a), and the posterior femoral condyle osteotomy plate (7) includes an osteotomy groove (72), and the osteotomy groove (72) is used to cooperate with an osteotomy tool to cut the posterior femoral condyle (b).

10. The posterior femoral condyle osteotomy positioning device according to claim 1, characterized in that: The posterior femoral condyle osteotomy positioning device also includes a posterior condyle bearing member (8), which is used to be inserted into the knee joint gap after cutting the posterior femoral condyle (b). The top surface of the posterior condyle bearing member (8) is used to contact the posterior femoral condyle (b) after osteotomy, and the bottom surface is used to contact the tibial platform (c). The posterior condyle bearing member (8) includes a positioning plate (81) that matches the four-in-one osteotomy plate.

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