AP measurer, thighbone osteotomy system and thighbone osteotomy method

Abstract

The invention provides an AP measurer, a thighbone osteotomy system and a thighbone osteotomy method, and relates to the technical field of thighbone osteotomy. The AP measurer comprises a base, a measuring main body, a mounting bracket and a probe, the measuring body is connected with the base and provided with first measuring scales. The mounting bracket is slidably connected to the measuring body in a first direction. The probe is slidably connected to the mounting bracket along a second direction, and the first direction is perpendicular to the second direction. A first post-parameter positioning hole is formed in the measuring main body and is used for post-parameter measurement; a first front parameter positioning hole is formed in the mounting bracket and is used for front parameter measurement; the front parameter measurement and the rear parameter measurement share a first metering scale. The AP measurer is suitable for front parameters and rear parameters and is compact in structure, one set of device can be flexibly used for different scenes, the front parameters and the rear parameters share one set of metering scales, measurement is accurate, and misoperation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of femoral osteotomy, in particular to an AP measurer, a femoral osteotomy system and a femoral osteotomy method. BACKGROUND

[0002] The existing AP (Antero Posterior) measuring device only provides a front reference or a rear reference, and the form is relatively single. Because the pin hole positions of the front reference and the rear reference are different, the osteotomy plate matched with the front reference and the osteotomy plate matched with the rear reference need to be matched respectively. In this way, if the AP measuring device is to be applied to the front reference and the rear reference at the same time, at least two AP measuring devices need to be provided, and each AP measuring device needs to be matched with a set of osteotomy plates, which leads to a doubled increase in the number and cost of the instruments used, and is not conducive to inventory and storage. Moreover, if the scheme is to be switched between the front reference and the rear reference on the spot, the AP measuring device needs to be reinstalled and fixed, which is complicated to operate, low in efficiency, and prone to confusion of the osteotomy plates for the front reference and the rear reference. SUMMARY

[0003] The purpose of the present application is to provide an AP measurer, a femoral osteotomy system and a femoral osteotomy method, and a set of AP measurers and osteotomy plates can meet two use scenarios of the front reference and the rear reference, are flexible to apply, greatly reduce the number of instruments used, reduce the cost, and avoid misoperation.

[0004] In a first aspect, the present application provides an AP measurer, comprising: a base; a measuring body connected with the base; a first measurement scale is arranged on the measuring body; a mounting bracket slidably connected with the measuring body in a first direction; a probe slidably connected with the mounting bracket in a second direction, the first direction being perpendicular to the second direction; a first rear reference positioning hole is arranged on the measuring body for rear reference measurement; a first front reference positioning hole is arranged on the mounting bracket for front reference measurement; the front reference measurement and the rear reference measurement share the first measurement scale.

[0005] In an optional embodiment, a first fixing hole is arranged on the measuring body for fixing the measuring body and a target femur.

[0006] In an optional embodiment, the base comprises a support plate protruding in the second direction, and the support plate is used to contact the posterior condyle of the target femur.

[0007] In an optional embodiment, the base and the measuring body are rotationally connected, and the angle of rotation of the base relative to the measuring body is 0-5 degrees.

[0008] In an optional embodiment, one of the base and the measuring body is provided with multiple slots, and the other is provided with a limiting post. The limiting post can be inserted into any of the slots. The limiting post is inserted into different slots to adjust the rotation angle of the base relative to the measuring body.

[0009] In an optional embodiment, the probe includes a probe and an adjustment handle, the probe being disposed at one end of the adjustment handle and used to contact the anterior condyle of the target femur; the adjustment handle is provided with a second measuring scale.

[0010] In an optional embodiment, the mounting bracket is provided with a guide hole, and the adjusting handle is movably disposed in the guide hole to move relative to the mounting bracket in a second direction.

[0011] In an optional embodiment, one of the mounting bracket and the measuring body is provided with a groove, and the other is provided with a slider, the slider being movably disposed in the groove so that the mounting bracket slides relative to the measuring body in a first direction.

[0012] In a second aspect, the present invention provides a femoral osteotomy system, including an osteotomy plate and an AP measuring device as described in any of the foregoing embodiments; The osteotomy plate is provided with a second anterior reference positioning hole and a second posterior reference positioning hole; the second anterior reference positioning hole and the first anterior reference positioning hole are respectively provided, and the second posterior reference positioning hole and the first posterior reference positioning hole are respectively provided.

[0013] In an optional embodiment, the osteotomy plate is provided with a first adjustment hole and a second adjustment hole, with a plurality of first adjustment holes located around the second anterior parameter positioning hole and a plurality of second adjustment holes located around the second posterior parameter positioning hole.

[0014] In an optional embodiment, four first adjustment holes are provided around the second front parameter positioning hole, namely a first fine adjustment hole, a second fine adjustment hole, a third fine adjustment hole and a fourth fine adjustment hole; wherein, the first fine adjustment hole and the second fine adjustment hole are located on one side of the second front parameter positioning hole, and the third fine adjustment hole and the fourth fine adjustment hole are located on the other side of the second front parameter positioning hole. The first fine-tuning hole is located to the upper left of the second front parameter positioning hole, and the second fine-tuning hole is located to the lower left of the second front parameter positioning hole; the third fine-tuning hole and the second fine-tuning hole are symmetrically arranged with respect to the second front parameter positioning hole, and the fourth fine-tuning hole and the first fine-tuning hole are symmetrically arranged with respect to the second front parameter positioning hole.

[0015] In an optional embodiment, the distance between the first fine-tuning hole and the second front parameter positioning hole in the third direction is greater than the distance between the second fine-tuning hole and the second front parameter positioning hole in the third direction.

[0016] In an optional embodiment, the osteotomy plate is provided with a second fixing hole, which is located between the second anterior reference positioning hole and the second posterior reference positioning hole; the second fixing hole is used to fix the osteotomy plate and the target femur.

[0017] In an optional embodiment, the osteotomy plate is integrally injection molded or 3D printed; the AP measuring device and the osteotomy plate are made of plastic or metal, or a mixture of metal and plastic.

[0018] Thirdly, the present invention provides a method for femoral osteotomy, comprising: Install the AP measuring device; wherein, the distal surface of the target femur is fitted with the measuring body, and the posterior condyle of the target femur is fitted with the base; A first fixing pin is installed in the first fixing hole to fix the AP measuring instrument; Adjust the mounting bracket and probe to measure the AP value of the target femur; Select a matching femoral prosthesis and osteotomy plate based on the AP value; A second fixing pin is provided in the first front reference positioning hole or the first rear reference positioning hole; Disassemble the first fixing pin and the AP measuring instrument; Install the osteotomy plate; wherein the second fixing pin passes through the second anterior reference positioning hole or the second posterior reference positioning hole on the osteotomy plate; A third fixing screw is provided in the second fixing hole of the osteotomy plate to fix the osteotomy plate; The target femur is osteotomized using the osteotomy plate.

[0019] In an optional implementation, the step of adjusting the mounting bracket and probe to measure the AP value of the target femur includes: The indication value of the first measurement scale on the measuring body and the indication value of the second measurement scale on the probe are consistent.

[0020] The AP measuring device, femoral osteotomy system, and femoral osteotomy method provided by this invention have the following beneficial effects: This AP measuring instrument features both a first posterior reference positioning hole and a first anterior reference positioning hole, concentrating the measurement of both anterior and posterior parameters into a single AP measuring instrument. It is applicable to both anterior and posterior parameters, providing more options for clinical measurement and osteotomy procedures, offering greater flexibility in use. Switching between anterior and posterior parameters is quicker and more convenient. Furthermore, compared to existing single-type AP measuring instruments, it reduces the number of AP measuring instruments required, facilitating inventory and storage, lowering costs, and reducing the risk of confusion between anterior and posterior reference instruments, thus improving osteotomy efficiency and accuracy. In addition, the use of the same calibration scale for both anterior and posterior parameters ensures high measurement accuracy, reduces measurement errors, and further enhances measurement precision and efficiency.

[0021] The femoral osteotomy system provided in this embodiment of the invention includes the aforementioned AP measuring device. Since one AP measuring device can simultaneously meet both anterior and posterior parameter usage scenarios, only one corresponding osteotomy plate is required, reducing the number of osteotomy plates used, facilitating instrument preparation and storage, and lowering instrument costs. Furthermore, it is easy to use and operate, which helps improve osteotomy efficiency and accuracy.

[0022] The femoral osteotomy method provided in this embodiment of the invention uses the aforementioned AP measuring device. The anterior and posterior parameters share the same AP measuring device and osteotomy plate, making it flexible to use, convenient to operate, and highly efficient. It also reduces the likelihood of confusion and misuse, thereby improving osteotomy efficiency and accuracy. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the installation scenario of the AP measuring device and femur provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the AP measuring device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the femur from a first-view perspective, provided as an embodiment of the present invention. Figure 4 This is a schematic diagram of the femur from a second perspective, provided in an embodiment of the present invention. Figure 5 A first-view structural schematic diagram of the AP measuring device and femoral prosthesis in a corresponding scenario provided in an embodiment of the present invention; Figure 6 A second-view structural schematic diagram of the AP measuring device and femoral prosthesis in a corresponding scenario provided in an embodiment of the present invention; Figure 7 This is a first-view structural diagram of the AP measuring device, osteotomy plate, and femoral prosthesis provided in an embodiment of the present invention. Figure 8 This is a structural schematic diagram from a second perspective of the AP measuring device, osteotomy plate, and femoral prosthesis provided in an embodiment of the present invention. Figure 9 This is a schematic diagram of the installation scenario of the osteotomy plate and femur provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the osteotomy plate provided in an embodiment of the present invention from a first perspective. Figure 11 This is a schematic diagram of the osteotomy plate provided in an embodiment of the present invention from a second perspective. Figure 12 A schematic diagram of the osteotomy plate and femoral fixation structure before osteotomy provided in an embodiment of the present invention; Figure 13 A schematic diagram of the osteotomy plate and femoral fixation structure after osteotomy provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of the femoral prosthesis provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the femur after osteotomy, provided in an embodiment of the present invention.

[0025] Icons: 100-AP measuring instrument; 110-base; 111-support plate; 112-external rotation adjustment block; 113-slot; 120-measuring body; 121-first rear parameter positioning hole; 122-first fixing hole; 123-first measurement scale; 124-limiting post; 125-first holding hole; 130-mounting bracket; 131-first front parameter positioning hole; 132-guide hole; 133-second indicator line; 140-probe; 141-probe; 142-adjusting handle; 143-second measurement scale; 200-strand Bone; 210-Anterior condyle; 220-Posterior condyle; 230-Distal surface; 300-Osteotomy plate; 310-Second anterior reference positioning hole; 320-First adjustment hole; 321-First fine adjustment hole; 322-Second fine adjustment hole; 323-Third fine adjustment hole; 324-Fourth fine adjustment hole; 330-Second posterior reference positioning hole; 340-Second adjustment hole; 350-Second fixation hole; 360-Second fixation screw; 370-Reinforcing rib; 380-Third fixation screw; 390-Second holding hole; 400-Femoral prosthesis; 410-Lowest point of the anterior condyle. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 of this invention is in use. They are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical 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 invention based on the specific circumstances.

[0032] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] This invention provides an AP measuring device for use in femoral osteotomy systems. It is applicable to both anterior and posterior parameter scenarios, offering flexibility and convenience. Its simple and lightweight structure facilitates inventory and storage, reduces costs, and minimizes the risk of instrument misuse or confusion in different scenarios.

[0034] Please combine Figures 1 to 3 The AP measuring device 100 (anteroposterior measuring device) is mainly used to accurately measure the anterior and posterior parameters of the femoral condyles to match the size of the femoral prosthesis 400. The AP measuring device 100 mainly determines the anterior and posterior diameter parameters of the femoral condyles by locating the relative position and distance between the anterior condyles 210 and posterior condyles 220 of the femur 200, providing a precise basis for selecting the appropriate femoral prosthesis 400 size and determining the osteotomy amount.

[0035] The AP measuring device 100 provided in this embodiment includes a base 110, a measuring body 120, a mounting bracket 130, and a probe 140. The measuring body 120 is connected to the base 110, and the measuring body 120 is provided with a first measurement scale 123. The mounting bracket 130 is slidably connected to the measuring body 120 along a first direction. The probe 140 is slidably connected to the mounting bracket 130 along a second direction, the first and second directions being perpendicular. The probe 140 is provided with a second measurement scale 143. The measuring body 120 is provided with a first rear parameter positioning hole 121 for rear parameter measurement. The mounting bracket 130 is provided with a first front parameter positioning hole 131 for front parameter measurement. The front and rear parameter measurements share the first measurement scale 123 and the second measurement scale 143. This AP measuring device 100 is applicable to both front and rear parameters, has a compact structure, and one set of devices can be flexibly used in different scenarios. Furthermore, the front and rear parameters share a set of measurement scales, ensuring accurate measurement and avoiding misoperation.

[0036] The measuring body 120 is provided with a first fixing hole 122 for fixing the measuring body 120 and the target femur 200. This arrangement allows for adjustment of the positions of the probe 140 and the mounting bracket 130 when the measuring body 120 is in a stable state, thereby improving measurement accuracy.

[0037] The base 110 includes a support plate 111 protruding along a second direction, which is used to contact the posterior condyle 220 of the target femur 200. In this embodiment, the first direction is approximately vertical, and the second direction is approximately horizontal. The support plate 111 is flat, which can better support the target femur 200, increase the contact area between the support plate 111 and the posterior condyle 220 of the target femur 200, and improve the support stability.

[0038] It is understandable that the size of the target femur 200 varies among different patients. To ensure that the AP measuring device 100 is suitable for a wider range of patients, the base 110 is designed with a fine-tuning structure, meaning the connection angle between the base 110 and the measuring body 120 is adjustable, thereby improving the flexibility and adaptability of the AP measuring device 100. Optionally, the base 110 includes two external rotation adjustment blocks 112. The two external rotation adjustment blocks 112 are respectively connected to the measuring body 120. The support plate 111 is connected to the external rotation adjustment blocks 112. The support plate 111 and the external rotation adjustment blocks 112 can be an integral structure or separate components.

[0039] Optionally, the external rotation adjustment block 112 and the measuring body 120 are rotatably connected, with the base 110 rotating relative to the measuring body 120 at an angle of 0 to 5 degrees. For example, one of the external rotation adjustment block 112 and the measuring body 120 may have a rotating shaft with its axis parallel to the second direction, and the other may rotate around this shaft to adjust the distance between the two external rotation adjustment blocks 112, thereby adjusting the distance between the two support plates 111. This allows the two posterior condyles 220 of the femur 200 to stably contact the support plates 111, improving the stability of the femur 200 during measurement and increasing measurement accuracy.

[0040] In this embodiment, one of the base 110 and the measuring body 120 is provided with multiple slots 113, and the other is provided with a limiting post 124. The limiting post 124 can be inserted into any of the slots 113. The limiting post 124 is inserted into different slots 113 to adjust the rotation angle of the base 110 relative to the measuring body 120. Optionally, the external rotation adjustment block 112 is provided with three slots 113, and the measuring body 120 is provided with a limiting post 124. The limiting post 124 is inserted into the three slots 113 respectively for limiting connection, which can correspond to three cases where the external rotation adjustment block 112 rotates relative to the measuring body 120 by 0°, 3°, and 5°. Of course, in some other embodiments, the number and position of the slots 113 can be flexibly designed, so that there are more choices for the connection angle between the external rotation adjustment block 112 and the measuring body 120, improving the adaptability and flexibility in the measurement process.

[0041] Optionally, the measuring body 120 is provided with a first holding hole 125, which is used to install a handle, making it convenient for the installation, transfer, and handling of the AP measuring device 100, and making the operation more convenient and efficient.

[0042] Please combine Figure 4It should be noted that, according to statistics, in a large number of knee joint anatomical cases, the distance L1 between the lowest points of the two posterior condyles 220 of the femur 200 is usually 42mm ≤ L1 ≤ 58mm. In this embodiment, the adjustable range of the external rotation adjustment block 112 can adjust the distance between the two support plates 111 from 21mm to 59mm, thereby ensuring that the lowest point of the posterior condyle 220 of the femur 200 is stably pressed on the support plate 111 in almost all patients, making it widely applicable.

[0043] Optionally, the probe 140 includes a probe 141 and an adjusting handle 142. The probe 141 is located at one end of the adjusting handle 142 and is used to contact the anterior condyle 210 of the target femur 200. The adjusting handle 142 is provided with a second measuring scale 143. In this embodiment, the first measuring scale 123 and the second measuring scale 143 are correspondingly matched.

[0044] Please combine Figure 5 and Figure 6 For example, the femoral prosthesis 400 comes in nine sizes, from 1 to 9. The first measuring scale 123 and the second measuring scale 143 each correspond to a measurement range of 1 to 9. During measurement, if the readings on the first measuring scale 123 and the second measuring scale 143 are both 1, then the corresponding femoral prosthesis 400 size 1 and osteotomy plate 300 size 1 are selected. If the readings on the first measuring scale 123 and the second measuring scale 143 are both 2, then the corresponding femoral prosthesis 400 size 2 and osteotomy plate 300 size 2 are selected; if the readings on the first measuring scale 123 and the second measuring scale 143 are both 3, then the corresponding femoral prosthesis 400 size 400 size 400 and osteotomy plate 300 size 3 are selected, and so on.

[0045] Of course, the graduation values ​​and ranges of the first measuring scale 123 and the second measuring scale 143 can be flexibly designed according to the actual specifications and models of the femoral prosthesis 400, and no specific limitations are made here.

[0046] Optionally, the mounting bracket 130 is provided with a guide hole 132, and the adjusting handle 142 is movably disposed in the guide hole 132 to move relative to the mounting bracket 130 in a second direction. Providing the guide hole 132 can ensure the smooth movement and linear movement of the adjusting handle 142, thereby improving measurement accuracy.

[0047] Optionally, one of the mounting bracket 130 and the measuring body 120 may be provided with a groove, and the other with a slider. The slider is movably disposed in the groove, allowing the mounting bracket 130 to slide relative to the measuring body 120 in a first direction. The groove and slider serve as guides, improving the smoothness of movement and linear movement of the mounting bracket 130.

[0048] It should be noted that the components of the AP measuring instrument 100 can be made of metal or plastic, or a combination of both. These components can be machined, 3D printed, or injection molded. Preferably, plastic is used, as injection molding or 3D printing is more convenient. It can be used as a disposable tool, making sterilization and disinfection easier and avoiding cross-infection and accuracy deviations caused by wear and tear from repeated use. Furthermore, plastic is low in cost, lightweight, and easy to store and transport.

[0049] It can be understood that the measurement principle of the AP measuring instrument 100 is roughly as follows: The AP measuring device 100 is used to complete the distal medullary opening and initial osteotomy of the target femur 200 after the initial osteotomy of the target femur 200, and to form a stable distal surface 230 on the target femur 200. The distal surface 230 serves as the mounting and measurement reference surface of the AP measuring device 100, and also as the reference osteotomy surface for subsequent osteotomy.

[0050] The measuring body 120 and the distal surface 230 are fitted together, and the two posterior condyles 220 of the target femur 200 are stably placed on the two support plates 111. First fixation screws (not shown) are driven into the first fixation holes 122 to fix the measuring body 120 to the distal surface 230. For better stability and fixation, there are two first fixation holes 122, located on either side of the middle of the measuring body 120, and one first fixation screw is driven into each first fixation hole 122. Of course, in other embodiments, the number and distribution of the first fixation holes 122 can be flexibly designed, and are not specifically limited here.

[0051] After fixing the measuring body 120, adjust the positions of the mounting bracket 130 and the probe 140 to ensure that the probe 141 is in contact with the anterior condyle 210 of the target femur 200. As the adjusting handle 142 moves along the second direction, the first indicator line on the mounting bracket 130 will point to different scale lines on the second measurement scale 143. As the mounting bracket 130 moves relative to the measuring body 120 along the first direction, the second indicator line 133 on the mounting bracket 130 will point to different scale lines on the first measurement scale 123. During adjustment, because the anterior condyle 210 of the target femur 200 is curved, the movement of the adjusting handle 142 along the second direction will simultaneously move the mounting bracket 130 along the first direction.

[0052] Based on the scale positions indicated by the first and second indicator lines 133, the matching femoral prosthesis model 400 is predicted. If the predicted model is femoral prosthesis 400, the scale value 3 on the first measuring scale 123 and the second indicator line 133 are aligned, and the scale value 3 on the second measuring scale 143 is finely adjusted to align with the first indicator line. At this time, the position where the probe 141 contacts the anterior condyle 210 is the lowest point 410 of the anterior condyle of femoral prosthesis 400 of model 3.

[0053] It should be noted that if a significant alignment deviation is found when fine-tuning the scale value 3 on the second measuring scale 143 and aligning it with the first indicator line, or if aligning the scale value 3 on the second measuring scale 143 and the first indicator line results in a large deviation between the scale value 3 on the first measuring scale 123 and the second indicator line 133, the pre-judgment of the femoral prosthesis 400 model may be incorrect. In this case, the femoral prosthesis 400 model can be re-judged, for example, by selecting a size 2 or 4 femoral prosthesis 400. Readjust the adjustment handle 142 to align the scale value 4 on the second measuring scale 143 with the first indicator line, and simultaneously align the scale value 4 on the first measuring scale 123 with the second indicator line 133. Alternatively, adjust the adjustment handle 142 to align the scale value 2 on the second measuring scale 143 with the first indicator line, and simultaneously align the scale value 2 on the first measuring scale 123 with the second indicator line 133. By matching the optimal femoral prosthesis 400 and osteotomy plate 300 in this way, when the first and second indicator lines 133 are aligned with the same scale value, the point where the probe 141 and the anterior condyle 210 contact is the lowest point 410 of the anterior condyle of the optimal femoral prosthesis 400. This contact point is a key reference point in subsequent osteotomy operations.

[0054] Please combine Figures 7 to 8 This invention also provides a femoral osteotomy system, including an osteotomy plate 300 and an AP measuring device 100 as described in any of the foregoing embodiments. The osteotomy plate 300 and the aforementioned AP measuring device 100 must be used together. It should be noted that... Figure 7 and Figure 8 The rod-shaped structures located in the first front reference positioning hole 131 and the second front reference positioning hole 310, as well as the rod-shaped structures located in the first rear reference positioning hole 121 and the second rear reference positioning hole 330, are only used to illustrate the correspondence between the first front reference positioning hole 131 and the second front reference positioning hole 310, and the correspondence between the first rear reference positioning hole 121 and the second rear reference positioning hole 330, and do not represent actual application scenarios.

[0055] Please combine Figures 9 to 11The osteotomy plate 300 is provided with a second anterior reference positioning hole 310 and a second posterior reference positioning hole 330. The second anterior reference positioning hole 310 is correspondingly set to the first anterior reference positioning hole 131, and the second posterior reference positioning hole 330 is correspondingly set to the first posterior reference positioning hole 121. In this way, the same osteotomy plate 300 can be used for both anterior and posterior reference osteotomy scenarios. Compared with existing anterior reference osteotomy plates that are only suitable for anterior reference osteotomy and posterior reference osteotomy plates that are only suitable for posterior reference osteotomy, the structure of the osteotomy plate 300 in this embodiment can greatly reduce the number of osteotomy plates 300 used and stored in clinical practice, simplifying the use, preparation, and preliminary work of instruments.

[0056] To improve positioning effectiveness and stability, two second front parameter positioning holes 310 and two second rear parameter positioning holes 330 are provided. Two first front parameter positioning holes 131 and two first rear parameter positioning holes 121 are provided on the AP measuring instrument 100. The two second front parameter positioning holes 310 and the two first front parameter positioning holes 131 are arranged in a one-to-one correspondence, as are the two second rear parameter positioning holes 330 and the two first rear parameter positioning holes 121.

[0057] Optionally, the osteotomy plate 300 is provided with a first adjustment hole 320 and a second adjustment hole 340. Multiple first adjustment holes 320 are located around the second anterior reference positioning hole 310, and multiple second adjustment holes 340 are located around the second posterior reference positioning hole 330. It can be understood that multiple first adjustment holes 320 are provided around each second anterior reference positioning hole 310, and multiple second adjustment holes 340 are provided around each second posterior reference positioning hole 330. The arrangement of the first adjustment holes 320 and the second adjustment holes 340 provides more flexible options for clinical osteotomy operations. The positioning holes can be flexibly selected according to the actual condition of the femur 200 of different patients to ensure that the patient can maintain a balance in the flexion-extension gap and greater freedom of movement after implantation of the femoral prosthesis 400.

[0058] Optionally, each second front reference positioning hole 310 is surrounded by four first adjustment holes 320, namely a first fine-tuning hole 321, a second fine-tuning hole 322, a third fine-tuning hole 323, and a fourth fine-tuning hole 324. The first fine-tuning hole 321 and the second fine-tuning hole 322 are located on one side of the second front reference positioning hole 310, and the third fine-tuning hole 323 and the fourth fine-tuning hole 324 are located on the other side of the second front reference positioning hole 310. Taking the illustrated position as an example, simply put, the first fine-tuning hole 321 and the second fine-tuning hole 322 are located to the left of the second front reference positioning hole 310, and the third fine-tuning hole 323 and the fourth fine-tuning hole 324 are located to the right of the second front reference positioning hole 310. Specifically, the first fine-tuning hole 321 is located to the upper left of the second anterior reference positioning hole 310, and the second fine-tuning hole 322 is located to the lower left of the second anterior reference positioning hole 310; the third fine-tuning hole 323 is located to the upper right of the second anterior reference positioning hole 310, and the fourth fine-tuning hole 324 is located to the lower right of the second anterior reference positioning hole 310. The third fine-tuning hole 323 and the second fine-tuning hole 322 are symmetrically arranged with respect to the second anterior reference positioning hole 310, and the fourth fine-tuning hole 324 and the first fine-tuning hole 321 are symmetrically arranged with respect to the second anterior reference positioning hole 310. In this way, during anterior osteotomy, the anterior reference fixation screw can be flexibly selected from either the second anterior reference positioning hole 310 or any one of the four first adjustment holes 320 according to the actual situation, thereby adjusting the installation position of the femoral prosthesis 400 to ensure the balance of the flexion-extension gap in the later stage. Optionally, the distance between the first fine-tuning hole 321 and the second anterior reference positioning hole 310 in the third direction is greater than the distance between the second fine-tuning hole 322 and the second anterior reference positioning hole 310 in the third direction.

[0059] Optionally, if the second front reference positioning hole 310 is taken as position 0, among the four first adjustment holes 320, the upper left hole is at position -2, the lower left hole is at position +1, the upper right hole is at position -1, and the lower right hole is at position +2.

[0060] Similarly, each second rear parameter positioning hole 330 is surrounded by four second adjustment holes 340, which are located at the upper left, lower left, upper right and lower right of the second rear parameter positioning hole 330, respectively. Their distribution and function are similar to those of the first adjustment hole 320, and will not be described in detail here.

[0061] Optionally, the osteotomy plate 300 is provided with a second fixation hole 350, which is located between the second anterior reference positioning hole 310 and the second posterior reference positioning hole 330; the second fixation hole 350 is used to fix the osteotomy plate 300 and the target femur 200. To improve the reliability and stability of the fixation of the osteotomy plate 300, two second fixation holes 350 are provided. The two second fixation holes 350 are respectively located on both sides of the middle part of the osteotomy plate 300.

[0062] Optionally, the osteotomy plate 300 is provided with a second holding hole 390, which is used to install a handle to facilitate the installation, transfer, and removal of the osteotomy plate 300, making the operation more convenient and efficient.

[0063] Optionally, the osteotomy plate 300 can be injection molded as a single piece or 3D printed; the osteotomy plate 300 can be made of plastic or metal, or partially of metal and partially of plastic. It is understandable that if the osteotomy plate 300 is made of plastic, it will be lower in cost, lighter in weight, and easier to carry and transport. It also allows for aseptic packaging and storage, facilitates inventory preparation, can be used only once, is safe and hygienic, reduces the risk of cross-infection from repeated use, and avoids precision deviations caused by wear and tear from repeated use. To ensure the structural strength of the osteotomy plate 300, reinforcing ribs 370 are designed at the opening locations, and the thickness of the osteotomy plate 300 is increased in the areas with the openings.

[0064] It should be noted that the osteotomy plate 300 also has multiple osteotomy grooves for determining the osteotomy angle and amount. Optionally, metal can be used in the osteotomy grooves, while plastic can be used in the remaining areas. This way, the metal material in the osteotomy grooves can prevent the generation of debris during osteotomy, improving the reliability of the osteotomy and reducing the risk of infection.

[0065] It should be noted that the global incidence of degenerative joint diseases such as osteoarthritis and rheumatoid arthritis is rising significantly, and joint replacement surgery (such as knee and hip replacement) has become the mainstream treatment for end-stage joint diseases, with the annual surgical volume increasing at a rate of approximately 5%-10% per year. Currently in China, with the increasing aging population, the number of knee implants is increasing year by year, reaching 600,000 by 2025. Meanwhile, emerging markets with well-developed medical infrastructure are extending joint surgery to second- and third-tier cities, further expanding the demand for surgical tools. However, traditional reusable tools present challenges in infection control, surgical efficiency and turnover pressure, and the risk of instrument wear and performance degradation. In this embodiment, disposable AP measuring devices 100 and osteotomy plates 300 are used, which avoids the risk of infection caused by incomplete sterilization, ensures consistent instrument performance, eliminates wear or functional deviations caused by reuse, and reduces instrument counting time, thereby shortening the interval between procedures and improving the safety and predictability of complex surgeries.

[0066] It is worth noting that in this embodiment, the main body of the osteotomy plate 300 is made of plastic, which can be injection molded in one piece, facilitating processing and manufacturing. To reduce costs, it is not convenient to add additional adjustment structures, such as cam structures and elastic elements, to the osteotomy plate 300 for transmission adjustment. By designing multiple first adjustment holes 320 to fine-tune the position of the second front parameter positioning hole 310, and multiple second adjustment holes 340 to fine-tune the position of the second rear parameter positioning hole 330, the structure is simple, the operation is convenient, and the cost is lower.

[0067] This invention also provides a method for femoral osteotomy at 200°, which mainly includes the following steps: Please combine Figure 1 First, install the AP measuring device 100. The distal surface 230 of the target femur 200 is attached to the measuring body 120, and the posterior condyle 220 of the target femur 200 is attached to the base 110. The two posterior condyles 220 are located on the two support plates 111 of the base 110 respectively.

[0068] Secure the AP measuring device 100. A first fixing pin is provided in the first fixing hole 122 to fix the measuring body 120 onto the distal end face 230.

[0069] Perform AP measurement. Adjust the mounting bracket 130 and probe 140 to measure the AP value of the target femur 200; it is necessary to ensure that the indication value on the first measuring scale 123 on the measuring body 120 and the indication value on the second measuring scale 143 on the probe 140 are consistent. The probe 141 of the probe 140 is always in contact with the anterior condyle 210, and the contact point between the probe 141 and the anterior condyle 210 is the lowest point 410 of the anterior condyle of the matching femoral prosthesis 400. Select the matching femoral prosthesis 400 model and osteotomy plate 300 based on the AP value. Select anterior or posterior osteotomy according to the clinical plan.

[0070] A second fixation screw 360 is installed in either the first anterior reference positioning hole 131 or the first posterior reference positioning hole 121. If anterior osteotomy is selected, the second fixation screw 360 is installed in the first anterior reference positioning hole 131. If posterior osteotomy is selected, the second fixation screw 360 is installed in the first posterior reference positioning hole 121.

[0071] Remove the first retaining pin and AP measuring device 100. The second retaining pin 360 remains on the distal face 230.

[0072] Please combine Figure 9 Install the osteotomy plate 300. Select the corresponding model of osteotomy plate 300 and install it onto the distal face 230. The second fixation pin 360 passes through the second anterior reference positioning hole 310 or the second posterior reference positioning hole 330 on the osteotomy plate 300. It can be understood that for anterior osteotomy, the second anterior reference positioning hole 310 on the osteotomy plate 300 is aligned with the second fixation pin 360 for installation. For posterior osteotomy, the second posterior reference positioning hole 330 on the osteotomy plate 300 is aligned with the second fixation pin 360 for installation.

[0073] Please combine Figure 12 A third fixing pin 380 is installed in the second fixing hole 350 of the osteotomy plate 300 to fix the osteotomy plate 300 to the distal surface 230 of the target femur 200, thus creating a stable osteotomy reference for subsequent osteotomy operations.

[0074] Please combine Figures 13 to 15 Finally, the target femur 200 is osteotomized using the osteotomy plate 300. It can be understood that, based on the structure of the femoral prosthesis 400, four osteotomy surfaces A, B, C, and D need to be formed on the femur 200. Thus, there are five mounting surfaces in total: the four osteotomy surfaces and the distal surface 230. These five mounting surfaces mate with the femoral prosthesis 400, and the femoral prosthesis 400 also has five corresponding mounting surfaces a, b, c, d, and e. The one-to-one correspondence between the five mounting surfaces and the five mounting surfaces ensures the stable installation of the femoral prosthesis 400, allowing it to be stably installed onto the femur 200, completing the joint replacement.

[0075] In summary, the AP measuring device 100, femoral osteotomy system 200, and femoral osteotomy method provided by the present invention have the following beneficial effects, including: The AP measuring instrument 100 is equipped with both a first posterior reference positioning hole 121 and a first anterior reference positioning hole 131, concentrating the measurement of both anterior and posterior references into a single AP measuring instrument 100. This allows for the application of both anterior and posterior references, providing more options for clinical measurement and osteotomy procedures, and offering greater flexibility in use. Switching between anterior and posterior references is quicker and more convenient. Furthermore, compared to existing single-type AP measuring instruments 100, it reduces the number of AP measuring instruments required, facilitating inventory and storage, lowering costs, and reducing the likelihood of confusion between anterior and posterior reference instruments, thus improving osteotomy efficiency and accuracy. In addition, the use of the same set of calibration scales for both anterior and posterior references ensures high measurement accuracy, reduces measurement errors, and further enhances measurement precision and efficiency.

[0076] The femoral osteotomy system provided in this embodiment includes the aforementioned AP measuring device 100. Since one AP measuring device 100 can simultaneously meet both anterior and posterior parameter usage scenarios, only one corresponding osteotomy plate 300 is needed. This osteotomy plate 300 can also be used for both anterior and posterior parameter osteotomies. By combining the anterior and posterior parameter osteotomy plates 300 into one unit, the structure is simple and lightweight, reducing the number of osteotomy plates 300 used, facilitating instrument preparation and storage, and lowering instrument costs. Furthermore, it is easy to use and operate, which helps improve osteotomy efficiency and accuracy.

[0077] The femoral osteotomy method provided in this embodiment of the invention uses the aforementioned AP measuring device 100. The anterior and posterior parameters share the AP measuring device 100 and the osteotomy plate 300. It is flexible in use, convenient in operation, and highly efficient in operation. It is less likely to cause confusion or misuse, thus improving osteotomy efficiency and accuracy and helping to improve the yield of joint replacement.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of the present invention.

Claims

1. An AP measuring device, characterized in that, include: Base (110); A measuring body (120) is connected to the base (110); the measuring body (120) is provided with a first measuring scale (123). Mounting bracket (130) is slidably connected to the measuring body (120) along a first direction. A probe (140) is slidably connected to the mounting bracket (130) along a second direction, the first direction and the second direction being perpendicular; the probe (140) is provided with a second measuring scale (143). The measuring body (120) is provided with a first rear parameter positioning hole (121) for rear parameter measurement; the mounting bracket (130) is provided with a first front parameter positioning hole (131) for front parameter measurement; the front parameter measurement and the rear parameter measurement share the first measurement scale (123) and the second measurement scale (143).

2. The AP measuring device according to claim 1, characterized in that, The measuring body (120) is provided with a first fixing hole (122) for fixing the measuring body (120) and the target femur (200).

3. The AP measuring device according to claim 1, characterized in that, The base (110) includes a support plate (111) protruding along a second direction, the support plate (111) being used to contact the posterior condyle (220) of the target femur (200).

4. The AP measuring device according to claim 1, characterized in that, The base (110) and the measuring body (120) are rotatably connected, and the base (110) rotates relative to the measuring body (120) at an angle of 0 to 5 degrees.

5. The AP measuring device according to claim 4, characterized in that, Of the base (110) and the measuring body (120), one is provided with multiple slots (113) and the other is provided with a limiting post (124). The limiting post (124) can be inserted into any of the slots (113). The limiting post (124) is inserted into different slots (113) to adjust the rotation angle of the base (110) relative to the measuring body (120).

6. The AP measuring device according to claim 1, characterized in that, The probe (140) includes a probe (141) and an adjustment handle (142). The probe (141) is located at one end of the adjustment handle (142) and is used to contact the anterior condyle (210) of the target femur (200). The adjustment handle (142) is provided with the second measurement scale (143).

7. The AP measuring device according to claim 6, characterized in that, The mounting bracket (130) is provided with a guide hole (132), and the adjusting handle (142) is movably disposed in the guide hole (132) to move relative to the mounting bracket (130) in a second direction.

8. The AP measuring instrument according to any one of claims 1 to 7, characterized in that, Of the mounting bracket (130) and the measuring body (120), one is provided with a groove and the other is provided with a slider. The slider is movably disposed in the groove so that the mounting bracket (130) slides relative to the measuring body (120) in a first direction.

9. A femoral osteotomy system, characterized in that, Includes an osteotomy plate (300) and an AP measuring device as described in any one of claims 1-8; The osteotomy plate (300) is provided with a second anterior reference positioning hole (310) and a second posterior reference positioning hole (330); the second anterior reference positioning hole (310) and the first anterior reference positioning hole (131) are respectively provided, and the second posterior reference positioning hole (330) and the first posterior reference positioning hole (121) are respectively provided.

10. The femoral osteotomy system according to claim 9, characterized in that, The osteotomy plate (300) is provided with a first adjustment hole (320) and a second adjustment hole (340), with a plurality of first adjustment holes (320) located around the second anterior reference positioning hole (310) and a plurality of second adjustment holes (340) located around the second posterior reference positioning hole (330).

11. The femoral osteotomy system according to claim 10, characterized in that, The second front parameter positioning hole (310) is surrounded by four first adjustment holes (320), namely a first fine adjustment hole (321), a second fine adjustment hole (322), a third fine adjustment hole (323), and a fourth fine adjustment hole (324); wherein the first fine adjustment hole (321) and the second fine adjustment hole (322) are located on one side of the second front parameter positioning hole (310), and the third fine adjustment hole (323) and the fourth fine adjustment hole (324) are located on the other side of the second front parameter positioning hole (310); The first fine-tuning hole (321) is located to the upper left of the second front parameter positioning hole (310), and the second fine-tuning hole (322) is located to the lower left of the second front parameter positioning hole (310); the third fine-tuning hole (323) and the second fine-tuning hole (322) are symmetrically arranged with respect to the second front parameter positioning hole (310), and the fourth fine-tuning hole (324) and the first fine-tuning hole (321) are symmetrically arranged with respect to the second front parameter positioning hole (310).

12. The femoral osteotomy system according to claim 11, characterized in that, The distance between the first fine-tuning hole (321) and the second front reference positioning hole (310) in the third direction is greater than the distance between the second fine-tuning hole (322) and the second front reference positioning hole (310) in the third direction.

13. The femoral osteotomy system according to claim 9, characterized in that, The osteotomy plate (300) is provided with a second fixing hole (350), which is located between the second anterior reference positioning hole (310) and the second posterior reference positioning hole (330); the second fixing hole (350) is used to fix the osteotomy plate (300) and the target femur (200).

14. The femoral osteotomy system according to claim 9, characterized in that, The osteotomy plate (300) is integrally molded by injection molding or 3D printing; the AP measuring device and the osteotomy plate (300) are made of plastic or metal, or a mixture of metal and plastic.

15. A method for femoral osteotomy, characterized in that, include: Install the AP measuring device; wherein the distal surface (230) of the target femur (200) is attached to the measuring body (120), and the posterior condyle (220) of the target femur (200) is attached to the base (110); A first fixing pin is provided in the first fixing hole (122) to fix the AP measuring device; Adjust the mounting bracket (130) and probe (140) to measure the AP value of the target femur (200); Select a matching femoral prosthesis (400) and osteotomy plate (300) based on the AP value. A second fixing pin (360) is provided in the first front reference positioning hole (131) or the first rear reference positioning hole (121); Disassemble the first fixing pin and the AP measuring instrument; Install the osteotomy plate (300); wherein the second fixation pin (360) passes through the second anterior reference positioning hole (310) or the second posterior reference positioning hole (330) on the osteotomy plate (300). A third fixing screw (380) is provided in the second fixing hole (350) of the osteotomy plate (300) to fix the osteotomy plate (300); The target femur (200) is osteotomized using the osteotomy plate (300).

16. The femoral osteotomy method according to claim 15, characterized in that, In the step of adjusting the mounting bracket (130) and probe (140) to measure the AP value of the target femur (200): The indication value of the first measurement scale (123) on the measuring body (120) and the indication value of the second measurement scale (143) on the probe (140) are consistent.

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