A positioning device for medial patellofemoral ligament reconstruction surgery

Abstract

The present invention provides a positioning device for medial patellofemoral ligament reconstruction surgery, which relates to the technical field of patellar dislocation treatment. It includes a fixed component and a movable component that moves along a first direction relative to the fixed component, the fixed component is provided with a fixed end positioning claw, and the movable component is provided with a movable end positioning claw, the fixed end positioning claw and the movable end positioning claw are arranged relative to each other and are configured to be clamped at both ends of the patella; the movable component also includes a first positioning arm and a second positioning arm that are transmission-connected to the fixed component and can move along the first direction, and the first positioning arm and the second positioning arm are both provided with positioning holes; wherein, the first positioning arm and the second positioning arm are configured to follow the movable component to move along the first direction, and to position the proximal preset position of the patella through the positioning hole. It can accurately locate the preset position of the proximal end of the patella, ensure the accuracy of the subsequent establishment of the bone tunnel, improve the doctor's surgical experience, improve the doctor's work efficiency, and reduce surgical risks.

Description

Technical Field

[0001] The present invention relates to the technical field of patellar dislocation treatment, in particular to a positioning device used in medial patellofemoral ligament reconstruction surgery. Background Art

[0002] The patella is an important component of the knee joint and can slide freely on the pulley during knee flexion and extension. The medial patellofemoral ligament, referred to as MPFL, is a ligament on the medial side of the knee joint that maintains the stability of the patella in the pulley. Young people, especially women, have weaker MPFL, and knee sprains may cause patellar dislocation. At this time, the medial patellofemoral ligament is torn or loosened. If not treated properly, it may lead to repeated dislocation and recurrent patellar dislocation.

[0003] Typically, patients have loose medial patellar tissue and tense lateral tissue. Patellar dislocation may occur with even a slight trauma, or even with every knee bend, the patella may dislocate to the outside. At this time, the knee joint is extremely painful and mobility is limited, seriously affecting knee joint function and quality of life. For young people who like sports, recurrent patellar dislocation often means the end of their sports career.

[0004] Traditional surgical treatments for patellar dislocation or recurrent patellar dislocation include tibial tubercle osteotomy and transposition and femoral trochleoplasty. However, these surgeries are highly invasive and have uncertain effects, and cannot be used as routine treatments. With the rapid development of sports medicine and the widespread popularization of knee arthroscopy, a consensus has been reached that recurrent patellar dislocation should undergo medial patellofemoral ligament reconstruction.

[0005] During medial patellofemoral ligament reconstruction surgery, bone tunnels need to be established at the proximal third and half of the patella. If the bone tunnels are not positioned accurately, it may lead to an increased incidence of postoperative patellar fractures or complications such as postoperative infection. In the existing technology, there is a lack of corresponding positioning equipment that can simultaneously locate two positions during surgery, which increases the risk of surgery. Summary of the Invention

[0006] The present invention mainly provides a positioning device for medial patellofemoral ligament reconstruction surgery, which is used to solve the technical problems raised in the above background technology, such as the inability to simultaneously locate two positions of the proximal patella, resulting in inaccurate positioning of the bone tunnel and increased surgical risks.

[0007] The technical solution adopted by the present invention to solve the above technical problems is:

[0008] A positioning device for medial patellofemoral ligament reconstruction surgery includes a fixing component and a movable component that moves relative to the fixing component along a first direction, the fixing component is provided with a fixed-end positioning claw, and the movable component is provided with a movable-end positioning claw, the fixed-end positioning claw and the movable-end positioning claw are arranged opposite to each other and are configured to be clamped at both ends of the patella; the movable component also includes a first positioning arm and a second positioning arm that are transmission-connected to the fixing component and can move along the first direction, and the first positioning arm and the second positioning arm are both provided with positioning holes; wherein, the first positioning arm and the second positioning arm are configured to follow the movable component to move along the first direction, and position the proximal preset position of the patella through the positioning hole.

[0009] Optionally, the movable component also includes a first gear group and a second gear group that are respectively connected to the fixed component in a transmission manner; the first gear group includes a first driving gear, a first driven gear and a first auxiliary gear, one end of the first driving gear is transmission-connected to the driving rack on the fixed component, the first driven gear is meshed with the other end of the first driving gear, the first auxiliary gear and the first driven gear are coaxially arranged, and the first auxiliary driven gear is meshed with the first driven rack on the first positioning arm; the second gear group includes a second driving gear, a second driven gear and a second auxiliary gear, one end of the second driving gear is transmission-connected to the driving rack on the fixed component, the second driven gear is meshed with the other end of the second driving gear, the second auxiliary gear is coaxially arranged with the second driven gear, and the second auxiliary driven gear is meshed with the second driven rack on the second positioning arm.

[0010] Optionally, the fixing assembly further includes a sliding plate extending in the first direction, the fixed end positioning claw is mounted on an end portion of the sliding plate, and the active rack is provided on the sliding plate.

[0011] Optionally, the movable component also includes a gear mounting assembly, which includes a driving gear mounting platform, a positioning plate and an auxiliary gear mounting platform connected in sequence by pins; a slide groove extending in a first direction is provided on the driving gear mounting platform, and a first mounting seat and a second mounting seat are provided on the slide groove, the sliding plate is provided in the slide groove, the first driving gear is mounted in the first mounting seat through a bearing, and the second driving gear is mounted in the second mounting seat through a bearing; the positioning plate is used to limit the first driving gear and the second driving gear; a first positioning groove and a second positioning groove are provided on the auxiliary gear mounting platform, the first auxiliary gear is mounted in the first positioning groove through a bearing, and the second auxiliary gear is mounted in the second positioning groove through a bearing.

[0012] Optionally, the first positioning arm also includes a first sliding rod, which is connected to the first driven rack; the second positioning arm also includes a second sliding rod, which is connected to the second driven rack; the driving gear mounting platform also has a first guide groove and a second guide groove parallel to each other, the first sliding rod is arranged in the first guide groove, and the second sliding rod is arranged in the second guide groove.

[0013] Optionally, a mounting groove is further provided at the bottom of the driving gear mounting platform, and the mounting groove is configured to fix the movable end positioning claw.

[0014] Optionally, a first positioning hole is provided on the first positioning arm, and the first positioning hole is configured to position the proximal third of the patella; a second positioning hole is provided on the second positioning arm, and the second positioning hole is configured to position the proximal half of the patella.

[0015] Optionally, the first positioning arm also includes a first positioning rod arranged perpendicular to the first direction, and the first positioning hole is opened on the first positioning rod; the second positioning arm also includes a second positioning rod arranged perpendicular to the first direction, and the second positioning hole is opened on the second positioning rod.

[0016] Optionally, the straight line defined by the first positioning hole and the second positioning hole is parallel to the first direction.

[0017] Optionally, the positioning device further includes a protective shell, which is sleeved on the movable component to protect parts in the movable component.

[0018] The present application provides a positioning device for medial patellofemoral ligament reconstruction surgery. By moving the movable component, the fixed end positioning claw and the movable end positioning claw are clamped at both ends of the patella. At the same time, the first positioning arm and the second positioning arm move a certain distance accordingly, thereby accurately and simultaneously positioning to the preset position of the proximal end of the patella, ensuring the accuracy of subsequent bone tunnel establishment, improving the doctor's surgical experience, improving the doctor's work efficiency, and reducing surgical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the positioning device of this application;

[0021] Figure 2 This is a schematic diagram of the internal structure of the positioning device of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the driving gear mounting platform of this application;

[0023] Figure 4 This is a schematic structural diagram of the first gear set of this application;

[0024] Figure 5 This is a schematic structural diagram of the second gear set of this application;

[0025] Figure 6 This is a schematic structural diagram of the first positioning arm and the second positioning arm of the present application.

[0026] Icons: 100 - movable assembly; 110 - movable end positioning claw; 120 - first positioning arm; 121 - first sliding rod; 122 - first driven rack; 123 - first positioning rod; 124 - first positioning hole; 130 - second positioning arm; 131 - second sliding rod; 132 - second driven rack; 133 - second positioning rod; 134 - second positioning hole; 140 - first gear set; 141 - first driving gear; 142 - first driven gear; 143 - first auxiliary gear Gear; 150-second gear set; 151-second driving gear; 152-second driven gear; 153-second auxiliary gear; 160-driving gear mounting platform; 161-first guide groove; 162-second guide groove; 163-mounting groove; 164-slide groove; 170-positioning plate; 180-auxiliary gear mounting platform; 200-fixing assembly; 210-fixed end positioning claw; 220-sliding plate; 221-driving rack; 300-protective shell; D1-first direction.

[0027] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clear, 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 part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0032] During medial patellofemoral ligament reconstruction surgery, bone tunnels must be established at the proximal third and half of the patella. Improper positioning of the bone tunnels can increase the incidence of postoperative patellar fractures or complications such as postoperative infection. The existing technology lacks corresponding positioning equipment capable of simultaneously positioning two locations during surgery, increasing the risk of surgery. To address these issues, embodiments of the present invention provide the following technical solutions to overcome them.

[0033] Please refer to Figures 1 to 6, an embodiment of the present application provides a positioning device for medial patellofemoral ligament reconstruction surgery, including a fixing component 200 and a movable component 100 that moves relative to the fixing component 200 along a first direction D1, the fixing component 200 is provided with a fixed-end positioning claw 210, and the movable component 100 is provided with a movable-end positioning claw 110, the fixed-end positioning claw 210 and the movable-end positioning claw 110 are arranged opposite to each other and are configured to be clamped at both ends of the patella; the movable component 100 also includes a first positioning arm 120 and a second positioning arm 130 that are transmission-connected to the fixing component 200 and can move along the first direction D1, and the first positioning arm 120 and the second positioning arm 130 are both provided with positioning holes; wherein, the first positioning arm 120 and the second positioning arm 130 are configured to follow the movable component 100 to move along the first direction D1, and position the proximal preset position of the patella through the positioning hole.

[0034] Specifically, the fixed end positioning claw 210 and the movable end positioning claw 110 are respectively provided at relative positions of the fixed component 200 and the movable end positioning claw 110. The fixed end positioning claw 210 and the movable end positioning claw 110 can be clamped at both ends of the patella during surgery to fix the entire device and adapt to patellae of different lengths. The first positioning arm 120 and the second positioning arm 130 can follow the movable component 100 to move along the first direction D1 and position the proximal preset position of the patella through the positioning hole.

[0035] It can be understood that there are various forms of transmission connection between the first positioning arm 120, the second positioning arm 130 and the fixed component 200 in the present invention, which can be gear transmission, belt transmission, or chain transmission; it can be mechanical transmission, electric transmission, or magnetic transmission. It only needs to ensure that when the movable component 100 moves relative to the fixed component 200, the first positioning arm 120 and the second positioning arm 130 move with the movable component 100.

[0036] It should be noted that the transmission speed ratio of the first positioning arm 120 and the second positioning arm 130 is a certain value. At this time, the first positioning arm 120 and the second positioning arm 130 can accurately locate the required position when they move. Preferably, when it is necessary to locate the one-third position and the one-half position of the proximal end of the patella, the transmission speed ratio of the first positioning arm 120 and the second positioning arm 130 should be three to two. The present invention locates the specific position by adjusting the transmission speed ratio.

[0037] In addition, the first direction D1 of the present invention, please refer to Figure 1 , which means the direction in which the movable component 100 moves relative to the fixed component 200, and will not be repeated hereafter.

[0038] The present application provides a positioning device for medial patellofemoral ligament reconstruction surgery. By moving the movable component 100, the fixed end positioning claw 210 and the movable end positioning claw 110 are clamped at both ends of the patella. At the same time, the first positioning arm 120 and the second positioning arm 130 move a certain distance accordingly, thereby accurately and simultaneously positioning to the preset position of the proximal end of the patella, ensuring the accuracy of the subsequent establishment of the bone tunnel, improving the doctor's surgical experience, improving the doctor's work efficiency, and reducing surgical risks.

[0039] Please refer to Figures 1 to 6 In the embodiment of the present application, the movable component 100 further includes a first gear set 140 and a second gear set 150 respectively connected to the fixed component 200 in a transmission manner; the first gear set 140 includes a first driving gear 141, a first driven gear 142 and a first auxiliary gear 143, one end of the first driving gear 141 is connected to the driving rack 221 on the fixed component 200 in a transmission manner, the first driven gear 142 is meshed with the other end of the first driving gear 141, and the first auxiliary gear 143 is coaxially arranged with the first driven gear 142. The first auxiliary driven gear is engaged with the first driven rack 122 on the first positioning arm 120; the second gear set 150 includes a second driving gear, a second driven gear 152 and a second auxiliary gear 153, one end of the second driving gear is transmission-connected to the driving rack 221 on the fixed assembly 200, the second driven gear 152 is engaged with the other end of the second driving gear, the second auxiliary gear 153 is coaxially arranged with the second driven gear 152, and the second auxiliary driven gear is engaged with the second driven rack 132 on the second positioning arm 130.

[0040] Specifically, the first driving gear 141 meshes with the first driven gear 142, and the first auxiliary gear 143 is coaxially arranged with the first driven gear 142. The second driving gear meshes with the second driven gear 152, and the second auxiliary gear 153 is coaxially arranged with the second driven gear 152. When the movable assembly 100 moves relative to the fixed assembly 200, the driving rack 221 drives the first driving gear 141 and the second driving gear to rotate, further driving the first auxiliary gear 143 and the second auxiliary gear 153 to rotate. The first driven rack 122 meshes with the first auxiliary gear 143, and the second driven rack 132 meshes with the second auxiliary gear 153. Therefore, the rotation of the first auxiliary gear 143 and the second auxiliary gear 153 can respectively drive the first positioning arm 120 and the second positioning arm 130 to move.

[0041] Please refer to Figure 1 and Figure 2In the embodiment of the present application, the fixed assembly 200 further includes a sliding plate 220 extending in the first direction D1. The fixed-end positioning claw 210 is mounted on the end of the sliding plate 220. The active rack 221 is disposed on the sliding plate 220. Specifically, the active rack 221 is disposed on the sliding plate 220, and the movable assembly 100 can slide relative to the sliding plate 220. This simplifies the configuration of the fixed assembly 200 and facilitates the active rack 221 to drive the first active gear 141 and the second active gear to rotate.

[0042] Please refer to Figures 1 to 5 In an embodiment of the present application, the movable component 100 further includes a gear mounting assembly, which includes a driving gear mounting platform 160, a positioning plate 170, and an auxiliary gear mounting platform 180 connected in sequence by pins; a sliding groove 164 extending in the first direction D1 is formed on the driving gear mounting platform 160, and a first mounting seat and a second mounting seat are provided on the sliding groove 164, the sliding plate 220 is disposed in the sliding groove 164, the first driving gear 141 is mounted in the first mounting seat through a bearing, and the second driving gear is mounted in the second mounting seat through a bearing; the positioning plate 170 is used to limit the first driving gear 141 and the second driving gear 151; a first positioning groove and a second positioning groove are formed on the auxiliary gear mounting platform 180, the first auxiliary gear 143 is mounted in the first positioning groove through a bearing, and the second auxiliary gear 153 is mounted in the second positioning groove through a bearing.

[0043] Specifically, the sliding plate 220 is slidably connected within the slide slot 164. The first driving gear 141 is mounted on the first mounting seat via a bearing. One end of the first driving gear 141 is in transmission connection with the driving rack 221 on the sliding plate 220, and the other end meshes with the first driven gear 142. The first auxiliary gear 143 is mounted in the first positioning slot via a bearing. The second driving gear 151 is mounted on the second mounting seat via a bearing. One end of the second driving gear 151 is in transmission connection with the driving rack 221 on the sliding plate 220, and the other end meshes with the second driven gear 152. The second auxiliary gear 153 is mounted in the second positioning slot via a bearing. When the fixed end positioning claw 210 and the movable end positioning claw 110 are clamped at both ends of the patella during surgery, the driving gear mounting platform 160 slides on the sliding plate 220 through the sliding groove 164, so that the driving rack 221 drives the first driving gear 141 and the second driving gear 151 to rotate, and further drives the first positioning arm 120 and the second positioning arm 130 to move along the first direction D1, completing the positioning of the preset position of the patella.

[0044] Please refer to Figure 1 、 Figure 2 and Figure 6In an embodiment of the present application, the first positioning arm 120 further includes a first sliding rod 121, which is connected to the first driven rack 122; the second positioning arm 130 further includes a second sliding rod 131, which is connected to the second driven rack 132; the driving gear mounting platform 160 also has a first guide groove 161 and a second guide groove 162 parallel to each other, the first sliding rod 121 is arranged in the first guide groove 161, and the second sliding rod 131 is arranged in the second guide groove 162.

[0045] Specifically, the first sliding rod 121 is slidably connected within the first guide slot 161 and moves along a first direction D1. The first sliding rod 121 is connected to the first driven rack 122 via a connecting rod. The first driven rack 122 meshes with the first auxiliary gear 143. When the first auxiliary gear 143 rotates, it drives the first driven rack 122 to move, and further drives the first sliding rod 121 to move along the first direction D1 within the first guide slot 161, so that the first movable arm completes the positioning of the patella. The second sliding rod 131 is slidably connected within the second guide slot 162 and moves along a second direction. The second sliding rod 131 is connected to the second driven rack 132 via a connecting rod. The second driven rack 132 meshes with the second auxiliary gear 153. When the second auxiliary gear 153 rotates, it drives the second driven rack 132 to move, and further drives the second sliding rod 131 to move along the second direction within the second guide slot 162, so that the second movable arm completes the positioning of the patella. It should be noted that the first sliding rod 121 and the first guide groove 161 are slidingly connected, and the second sliding rod 131 and the second guide groove 162 are slidingly connected, so that the first positioning arm 120 and the second positioning arm 130 can move more stably, thereby preventing the position deviation of the first positioning arm 120 and the second positioning arm 130.

[0046] Please refer to Figures 1 to 3 In the embodiment of the present application, a mounting groove 163 is further provided at the bottom of the driving gear mounting platform 160 , and the mounting groove 163 is configured to fix the movable end positioning claw 110 .

[0047] Specifically, a mounting groove 163 is provided on one end of the bottom of the driving gear mounting platform 160 near the fixed assembly 200, and the movable end positioning claw 110 is installed in the mounting groove 163 to make the movable end positioning claw 110 more stable and facilitate the replacement of the movable end positioning claw 110. When the movable end positioning claw 110 is damaged during use, it is only necessary to replace a new movable end positioning claw 110 and install it in the mounting groove 163, thereby enhancing the replaceability of the positioning device parts.

[0048] Please refer to Figure 1 Figure 2 and Figure 6 In an embodiment of the present application, a first positioning hole 124 is provided on the first positioning arm 120, and the first positioning hole 124 is configured to position the proximal one-third of the patella; a second positioning hole 134 is provided on the second positioning arm 130, and the second positioning hole 134 is configured to position the proximal one-half of the patella. The first positioning arm 120 also includes a first positioning rod 123 arranged perpendicular to the first direction D1, and the first positioning hole 124 is provided on the first positioning rod 123; the second positioning arm 130 also includes a second positioning rod 133 arranged perpendicular to the first direction D1, and the second positioning hole 134 is provided on the second positioning rod 133.

[0049] Specifically, the first positioning rod 123 is connected to the first sliding rod 121 and is arranged perpendicular to the first direction D1. A first positioning hole 124 is opened on the first positioning rod 123. The first positioning hole 124 is used to locate the proximal one-third position of the patella. The second positioning rod 133 is connected to the second sliding rod 131 and is arranged perpendicular to the first direction D1. A second positioning hole 134 is opened on the second positioning rod 133. The second positioning hole 134 is used to locate the proximal one-half position of the patella.

[0050] In the embodiment of the present application, a straight line defined by the first positioning hole 124 and the second positioning hole 134 is parallel to the first direction D1 .

[0051] Specifically, the straight line defined by the first positioning hole 124 and the second positioning hole 134 needs to be parallel to the first direction D1 to ensure that, during the positioning process, the first positioning hole 124 and the second positioning hole 134 are always located on the central axis of the patella, further improving the positioning accuracy.

[0052] In an embodiment of the present application, the positioning device further includes a protective shell 300 , which is sleeved on the movable component 100 to protect parts in the movable component 100 .

[0053] Specifically, the protective shell 300 is mounted on the movable component 100 to ensure that the first gear set 140 and the second gear set 150 are not touched or damaged by the outside world during rotation, thereby extending the service life of the gear set and further extending the service life of the positioning device.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A positioning device for medial patellofemoral ligament reconstruction surgery, characterized in that: The positioning device includes a fixed component and a movable component that moves relative to the fixed component along a first direction, the fixed component is provided with a fixed end positioning claw, the movable component is provided with a movable end positioning claw, the fixed end positioning claw and the movable end positioning claw are arranged opposite to each other and are configured to clamp at both ends of the patella; The movable assembly further includes a first positioning arm and a second positioning arm that are transmission-connected to the fixed assembly and capable of moving along the first direction, and the first positioning arm and the second positioning arm are both provided with positioning holes; The movable assembly further comprises a first gear set and a second gear set respectively connected in transmission with the fixed assembly; The first gear set includes a first driving gear, a first driven gear and a first auxiliary gear, one end of the first driving gear is transmission-connected to the driving rack on the fixed assembly, the first driven gear is meshed with the other end of the first driving gear, the first auxiliary gear is coaxially arranged with the first driven gear, and the first auxiliary gear is meshed with the first driven rack on the first positioning arm; The second gear set includes a second driving gear, a second driven gear and a second auxiliary gear, one end of the second driving gear is transmission-connected to the driving rack on the fixed assembly, the second driven gear is meshed with the other end of the second driving gear, the second auxiliary gear is coaxially arranged with the second driven gear, and the second auxiliary gear is meshed with the second driven rack on the second positioning arm; The first positioning arm is provided with a first positioning hole, which is located at one-third of the proximal end of the patella; the second positioning arm is provided with a second positioning hole, which is located at one-half of the proximal end of the patella; The first positioning arm and the second positioning arm are configured to follow the movable component to move along the first direction, and to position the proximal third of the patella through the first positioning hole, and to position the proximal half of the patella through the second positioning hole.

2. The positioning device according to claim 1, characterized in that The fixing assembly further includes a sliding plate extending in the first direction, the fixed end positioning claw is mounted on the end of the sliding plate, and the active rack is provided on the sliding plate.

3. The positioning device according to claim 2, characterized in that The movable assembly further comprises a gear mounting assembly, which comprises a driving gear mounting platform, a positioning plate and an auxiliary gear mounting platform connected in sequence by pins; The driving gear mounting platform is provided with a slide groove extending in a first direction, and a first mounting seat and a second mounting seat are provided on the slide groove, the sliding plate is provided in the slide groove, the first driving gear is mounted in the first mounting seat via a bearing, and the second driving gear is mounted in the second mounting seat via a bearing; The positioning plate is used to limit the first driving gear and the second driving gear; The auxiliary gear mounting platform is provided with a first positioning groove and a second positioning groove. The first auxiliary gear is mounted in the first positioning groove via a bearing, and the second auxiliary gear is mounted in the second positioning groove via a bearing.

4. The positioning device according to claim 3, characterized in that The first positioning arm further includes a first sliding rod, and the first sliding rod is connected to the first driven rack; The second positioning arm further includes a second sliding rod, and the second sliding rod is connected to the second driven rack; The driving gear mounting platform is further provided with a first guide groove and a second guide groove which are parallel to each other. The first sliding rod is arranged in the first guide groove, and the second sliding rod is arranged in the second guide groove.

5. The positioning device according to claim 3, characterized in that The bottom of the driving gear mounting platform is further provided with a mounting groove, and the mounting groove is configured to fix the movable end positioning claw.

6. The positioning device according to claim 1, characterized in that The first positioning arm further includes a first positioning rod disposed perpendicular to the first direction, and the first positioning hole is formed on the first positioning rod; The second positioning arm further includes a second positioning rod disposed perpendicular to the first direction, and the second positioning hole is formed on the second positioning rod.

7. The positioning device according to claim 6, characterized in that A straight line defined by the first positioning hole and the second positioning hole is parallel to the first direction.

8. The positioning device according to claim 1, characterized in that The positioning device further comprises a protective shell, which is sleeved on the movable assembly to protect parts in the movable assembly.

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