Novel leg fixing device for magnetic resonance examination

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a novel magnetic resonance examination leg fixing device which comprises a placement frame, a fixed mounting shell is fixedly arranged on the bottom wall of the placement frame, a first transmission assembly is arranged on the inner bottom wall of the fixed mounting shell, and guide rods are symmetrically and fixedly arranged on the bottom wall of the placement frame; a sliding mounting shell is arranged on the guide rod in a sliding mode, second transmission assemblies are arranged on the inner bottom wall of the sliding mounting shell in an array mode, pressure compensation assemblies are arranged on the second transmission assemblies, accurate fixing of ankles and thighs of a patient is achieved through the two independent transmission assemblies, and leg movement in the examination process is effectively reduced; the pressure compensation assembly automatically adjusts the pressure of the clamping plate when the legs of the patient shake, external energy input is not needed, and the fixing stability is ensured; meanwhile, the automatic pop-up sliding block designed according to the structural characteristics of the knee fossa of the human body can accurately recognize the knee position, adapt to patients of different body types and improve the imaging quality.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and specifically refers to a novel leg fixing device for magnetic resonance examination. Background Art

[0002] In magnetic resonance imaging (MRI) examinations, in order to obtain high-quality images, patients need to remain still during the examination. However, due to the long examination time, it is difficult for patients to remain still all the time, especially in the legs. Existing leg fixation devices for MRI examinations often have the following shortcomings: (1) Existing fixation devices often only provide simple fixation methods and cannot be accurately adjusted according to the body shapes of different patients. As a result, the patient's legs may still move during the examination, affecting the imaging quality; (2) Existing fixation devices are often only adjusted before the examination. Taking into account the patient's comfort, the pressure is often not too high. During the examination, when the patient's legs shake, the pressure cannot be adjusted according to the shaking to help the patient stabilize quickly. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and provides a new type of leg fixation device for magnetic resonance imaging examination. It achieves precise fixation of the patient's ankle and thigh through two sets of independent transmission components, maintains appropriate pressure to fix the patient's thigh, and effectively reduces leg movement during the examination. When the patient's legs shake, the compressed airflow completes dynamic pressure adjustment, and no external energy input is required to ensure fixation stability. The automatic pop-up slider design utilizes the structural characteristics of the human knee pit to accurately identify the knee position and adjust the clamp to accommodate patients of different body shapes.

[0004] The technical scheme adopted by the present invention is as follows: This scheme provides a new type of leg fixation device for magnetic resonance examination, including a placement frame, which serves as the basic structure of the entire device and is used to support and fix other components, while providing a stable platform for patients to perform magnetic resonance examinations. An air pump is fixedly arranged on the bottom wall of the placement frame to provide air pressure power. An adjusting cylinder is symmetrically fixedly arranged on the bottom wall of the placement frame to adjust the clamping position, which is suitable for the legs of patients of different body shapes. The cylinder body of the adjusting cylinder is connected to the exhaust port of the air pump. A groove body is symmetrically penetrated on the bottom wall of the placement frame. A fixed installation shell is fixedly arranged on the bottom wall of the placement frame. The fixed installation shell is located directly below one end of the groove body away from the adjusting cylinder. A first transmission assembly is arranged on the inner bottom wall of the fixed installation shell to drive the clamp to move toward each other. The first transmission assembly is symmetrically provided with a first splint to fix the patient's ankle to ensure the ankle The leg support is fixedly provided with a first cylinder which cooperates with the first transmission assembly for transmission and provides power for the first transmission assembly, and the cylinder body of the first cylinder is connected with the exhaust port of the air pump; a sliding mounting shell is slidably provided on the bottom wall of the placement rack, and the side wall of the sliding mounting shell is fixedly connected with the piston rod end of the adjusting cylinder; a second transmission assembly is symmetrically provided on the inner bottom wall of the sliding mounting shell for driving the clamps to move toward each other; a pressure compensation assembly is provided on the second transmission assembly for automatically adjusting the pressure of the splint when the patient's legs shake; a second splint is symmetrically provided on the pressure compensation assembly for fixing the patient's thigh to ensure that the thigh remains motionless during the examination; a second cylinder which cooperates with the second transmission assembly for transmission and provides power for the second transmission assembly is fixedly provided on the inner bottom wall of the sliding mounting shell for transmission and provides power for the second transmission assembly, and the cylinder body of the second cylinder is connected with the exhaust port of the air pump.

[0005] Furthermore, the second transmission assembly includes a second transmission gear, a second transmission rack and a second driven rack; the second transmission gear is rotatably connected to the inner bottom wall of the sliding mounting shell to ensure synchronous movement of the thigh fixed part, the second transmission rack is slidably engaged with the inner bottom wall of the sliding mounting shell, the second driven rack is slidably engaged with the inner bottom wall of the sliding mounting shell, the second transmission rack and the second driven rack are symmetrically arranged about the second transmission gear axis, the second transmission rack and the second driven rack are both meshed with the second transmission gear, and the second transmission rack and the second driven rack are fixedly provided with a connecting plate at one end away from the second transmission gear, and a sliding groove is provided on the side wall of the connecting plate close to the second transmission gear, and the side wall of any connecting plate away from the second transmission gear is fixedly connected to the piston rod of the second cylinder.

[0006] Furthermore, the pressure compensation assembly includes a compensation transmission gear, a movable transmission rack, a second support tube and a second return spring; the compensation transmission gear is coaxially connected to the top wall of the second transmission gear and serves as the core of power transmission; the movable transmission rack is slidably engaged in the slide groove, and the movable transmission rack meshes with the compensation transmission gear; the second support tube is fixedly connected to the top wall of the movable transmission rack and adjusts the fixing force in real time in response to changes in leg pressure; an air pipe is fixedly connected to the circumferential wall of the second support tube to provide an airflow path; the other end of the air pipe is fixedly connected to the inner cavity of the slide groove; the second splint is slidably connected to the inner wall of the second support tube away from the movable transmission rack; the second return spring is nested in the second support tube; the two ends of the second return spring are respectively fixedly connected to the sliding shaft of the second splint and the inner wall of the second support tube.

[0007] Furthermore, the first transmission assembly includes a first transmission gear, a first transmission rack and a first driven rack; the first transmission gear is rotatably connected to the inner bottom wall of the fixed installation shell, serving as the core of power transmission, the first transmission rack is slidably engaged and connected to the inner bottom wall of the fixed installation shell, the side wall of the first transmission rack is fixedly connected to the piston rod end of the first cylinder, receives the power of the first cylinder, and transmits it to the first transmission gear, the first driven rack is slidably engaged and connected to the inner bottom wall of the fixed installation shell, the first transmission rack and the first driven rack are both meshed with the first transmission gear, and the first support tube is fixedly provided on the top wall of the first transmission rack and the first driven rack.

[0008] Furthermore, a contact switch is fixedly provided in the first support tube, and the contact switch is electrically connected to the adjusting cylinder for detecting whether the first splint has contacted the patient's ankle to trigger the next action. The first splint is slidably connected to the inner wall of the first support tube, and a first return spring is nested in the first support tube, and both ends of the first return spring are respectively fixedly connected to the sliding shaft of the first splint and the inner wall of the first support tube.

[0009] Furthermore, a slide rail frame is fixedly provided on the top wall of the sliding mounting shell to provide a sliding track, and a release switch is fixedly provided on the inner wall of the slide rail frame. The release switch is electrically connected to the adjusting cylinder and the second cylinder to detect whether the sliding mounting shell has exceeded the patient's knee position and trigger the next action. A detection component is slidingly connected to the slide rail frame to detect the knee position.

[0010] Furthermore, the detection component includes a slider, a release spring and a driven wheel; the slider is slidably connected to the slide rail frame, a rotation groove is opened at the end of the slider away from the release switch, one end of the release spring is fixedly connected to the inner wall of the slide rail frame, the other end of the release spring is fixedly connected to the end of the slider close to the release switch, and the driven wheel is rotatably connected in the rotation groove.

[0011] The beneficial effects achieved by the present invention using the above structure are as follows: (1) Two sets of independent transmission components are used to precisely fix the patient's ankle and thigh, respectively, effectively reducing the movement of the patient's legs during the MRI examination. The sliding connection between the second support tube and the second splint is used to sense the shaking of the patient's legs, and the airflow is used to push the sliding movable transmission rack, which can automatically increase the pressure when shaking, thereby reducing the movement of the patient's legs during the examination and improving the clarity and quality of the imaging. (2) The design of the second support tube and the second splint allows the clamp to be automatically tightened by the airflow when the patient's legs shake. By using the built-in airflow, when the second splint is under pressure, the second splint slides into the second support tube, compressing the gas in the tube. The gas flows into the slide groove through the air tube, pushing the movable transmission rack to slide toward the compensation transmission gear, thereby driving the splints to continue to move toward each other, achieving a tighter fixation. No external energy input is required, and it is completely triggered by the natural movement of the patient's legs. (3) Taking advantage of the structural characteristics of the human body, namely that the knee pit is lower than the muscle area on both sides of the knee, an automatically pop-up slider is designed. When the slider contacts the calf and moves to the knee pit, it automatically pops out, which can accurately identify the patient's knee position and complete the positioning of the sliding mounting shell at the same time, ensuring that the splint can be accurately moved to the back of the knee, and the position of the clamp can be adjusted according to the patient's height and leg length, thereby adapting to the needs of patients of different body shapes to achieve fixation of the thigh. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a top-down perspective structural diagram of a novel leg fixation device for magnetic resonance imaging proposed by the present invention; Figure 2 This is a bottom-up stereoscopic structural schematic diagram of a novel leg fixation device for magnetic resonance imaging proposed by the present invention; Figure 3 for Figure 1 A partial enlarged view of the middle part; Figure 4 This is a schematic structural diagram of the first transmission assembly proposed by the present invention; Figure 5 This is a schematic cross-sectional structure diagram of a first support tube according to a second embodiment of the present invention; Figure 6The structure diagram of the second transmission assembly proposed by the present invention is as follows Figure 1 ; Figure 7 The structure diagram of the second transmission assembly proposed by the present invention is as follows Figure 2 ; Figure 8 The cross-sectional structure diagram of the second transmission assembly proposed by the present invention is as follows: Figure 1 ; Fig. 9 The cross-sectional structure diagram of the second transmission assembly proposed by the present invention is as follows: Figure 2 ; Fig.10 The cross-sectional structure diagram of the detection assembly proposed by the present invention is shown in FIG. Figure 2 .

[0013] Among them, 1. placement rack, 11. air pump, 12. adjusting cylinder, 13. trough body, 14. slide rail rack, 141. release switch, 2. fixed installation shell, 21. first transmission assembly, 211. first transmission gear, 212. first transmission rack, 213. first driven rack, 214. first support tube, 2141. contact switch, 2142. first return spring, 22. first clamp, 23. first cylinder, 3. sliding installation shell, 31. second transmission assembly, 311. second transmission gear, 312. second transmission rack, 313. second driven rack, 314. connecting plate, 315. slide groove, 32. pressure compensation assembly, 321. compensation transmission gear, 322. movable transmission rack, 323. second support tube, 324. second return spring, 325. air pipe, 33. Second clamping plate, 34. Second cylinder, 4. Detection assembly, 41. Sliding block, 411. Rotation slot, 42. Release spring, 43. Driven wheel.

[0014] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] Example 1: Please refer to Figure 1-Figure 9The present embodiment provides a novel leg fixing device for magnetic resonance examination, including a placing frame 1, an air pump 11 is fixedly arranged on the bottom wall of the placing frame 1, an adjusting cylinder 12 is symmetrically fixedly arranged on the bottom wall of the placing frame 1, the cylinder body of the adjusting cylinder 12 is connected to the exhaust port of the air pump 11, a groove body 13 is symmetrically penetrated through the bottom wall of the placing frame 1, a fixed installation shell 2 is fixedly arranged on the bottom wall of the placing frame 1, the fixed installation shell 2 is located just below the end of the groove body 13 away from the adjusting cylinder 12, a first transmission assembly 21 is arranged on the inner bottom wall of the fixed installation shell 2, a first clamping plate 22 is symmetrically arranged on the first transmission assembly 21, and a first clamping plate 22 is fixedly arranged on the inner bottom wall of the fixed installation shell 2. A first cylinder 23 is provided which is in transmission cooperation with the first transmission assembly 21. The cylinder body of the first cylinder 23 is communicated with the exhaust port of the air pump 11. The first transmission assembly 21 includes a first transmission gear 211, a first transmission rack 212 and a first driven rack 213. The first transmission gear 211 is rotatably connected to the inner bottom wall of the fixed installation shell 2. The first transmission rack 212 is slidably engaged with the inner bottom wall of the fixed installation shell 2. The side wall of the first transmission rack 212 is fixedly connected to the piston rod end of the first cylinder 23. The first driven rack 213 is slidably engaged with the inner bottom wall of the fixed installation shell 2. The first transmission rack 212 and the first driven rack 213 are slidably engaged with the inner bottom wall of the fixed installation shell 2. The driven rack 213 is meshed with the first transmission gear 211, and the first support tube 214 is fixedly provided on the top wall of the first transmission rack 212 and the first driven rack 213, and the first clamping plate 22 is fixedly provided on the first support tube 214; a sliding mounting shell 3 is slidably provided on the bottom wall of the placement rack 1, and the side wall of the sliding mounting shell 3 is fixedly connected to the piston rod end of the regulating cylinder 12, and a second transmission assembly 31 is symmetrically provided on the inner bottom wall of the sliding mounting shell 3, and the second transmission assembly 31 includes a second transmission gear 311, a second transmission rack 312 and a second driven rack 313; the second transmission gear 311 is rotatably connected to the sliding mounting shell On the inner bottom wall of the body 3, the second transmission rack 312 is slidably engaged with the inner bottom wall of the sliding mounting shell 3, and the second driven rack 313 is slidably engaged with the inner bottom wall of the sliding mounting shell 3. The second transmission rack 312 and the second driven rack 313 are symmetrically arranged about the second transmission gear 311 axis. The second transmission rack 312 and the second driven rack 313 are meshed with the second transmission gear 311. The second transmission rack 312 and the second driven rack 313 are fixedly provided with a connecting plate 314 at one end away from the second transmission gear 311. A sliding groove 315 is provided on the side wall of the connecting plate 314 close to the second transmission gear 311. Figure 5As shown, the right connecting plate 314 is fixedly connected to the piston rod of the second cylinder 34 away from the side wall of the second transmission gear 311; the second transmission assembly 31 is provided with a pressure compensation assembly 32, and the pressure compensation assembly 32 is symmetrically provided with a second clamping plate 33, and the pressure compensation assembly 32 includes a compensation transmission gear 321, a movable transmission rack 322, a second support tube 323 and a second return spring 324; the compensation transmission gear 321 is coaxially connected to the top wall of the second transmission gear 311, the movable transmission rack 322 is slidably engaged and connected in the slide groove 315, the movable transmission rack 322 meshes with the compensation transmission gear 321, and the second support tube 323 is fixedly connected On the top wall of the movable transmission rack 322, an air pipe 325 is fixedly connected to the circumferential wall of the second support tube 323, and the other end of the air pipe 325 is fixedly connected to the inner cavity of the slide groove 315, and the second clamping plate 33 is slidably connected to the inner wall of the second support tube 323 away from the movable transmission rack 322, and the second return spring 324 is nested in the second support tube 323, and the two ends of the second return spring 324 are respectively fixedly connected to the sliding shaft of the second clamping plate 33 and the inner wall of the second support tube 323; a second cylinder 34 that cooperates with the second transmission assembly 31 is fixedly provided on the inner bottom wall of the sliding installation housing 3, and the cylinder body of the second cylinder 34 is connected to the exhaust port of the air pump 11; In this embodiment, the patient lies on the placement frame 1 with his legs placed above the slot body 13, the air pump 11 is started to supply air, the first cylinder 23 pushes the first transmission rack 212 to slide toward the first transmission gear 211, and under the action of the first transmission gear 211, the first transmission rack 212 is simultaneously driven to move toward each other, and the symmetrically arranged first splints 22 are driven to move toward each other to fix the patient's ankle, and then the adjustment cylinder 12 drives the sliding mounting shell 3 to slide away from the fixed mounting shell 2 until the sliding mounting shell 3 moves to a position beyond the knee, the second cylinder 34 pushes the connecting plate 314 fixedly connected to the second transmission rack 312 and the second transmission rack 312 to slide toward the first transmission gear 211, and under the action of the second transmission gear 311, the second driven rack 313 and the connecting plate fixedly connected to the second driven rack 313 are simultaneously driven. 314 move toward each other, driving the symmetrically arranged second splint 33 to move toward each other, maintaining appropriate pressure to fix the patient's thigh. When the patient's leg shakes, pressure is applied to the second splint 33 on one side to push the second splint 33 and the second splint 33 to slide into the second support tube 323, compressing the gas in the second support tube 323. The airflow in the second support tube 323 flows into the slide groove 315 through the air pipe 325. The airflow drives the movable transmission rack 322 to slide toward the compensation transmission gear 321. Under the action of the compensation transmission gear 321, the movable transmission rack 322 on the other side is driven to slide toward the compensation transmission gear 321, driving the symmetrically arranged second splint 33 to continue to move toward each other, thereby more tightly fixing the patient's leg, helping the patient's leg to stabilize, and reducing image blur or artifacts caused by movement.

[0017] Embodiment 2: This embodiment is based on the above embodiment, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Fig.10In this embodiment, a contact switch 2141 is fixedly provided in the first support tube 214, and the contact switch 2141 is electrically connected to the regulating cylinder 12. The first clamping plate 22 is slidably connected to the inner wall of the first support tube 214, and a first return spring 2142 is nested in the first support tube 214. The two ends of the first return spring 2142 are respectively fixedly connected to the sliding shaft of the first clamping plate 22 and the inner wall of the first support tube 214; a slide rail frame 15 is fixedly provided on the top wall of the sliding mounting housing 3, and a release switch 15 is fixedly provided on the inner wall of the slide rail frame 15. 1. The release switch 151 is electrically connected to the regulating cylinder 12, and the slide rail frame 15 is slidably engaged with a detection assembly 4; the detection assembly 4 includes a slider 41, a release spring 42, and a driven wheel 43; the slider 41 is slidably connected to the slide rail frame 15, and a rotation groove 411 is provided at one end of the slider 41 away from the release switch 151, one end of the release spring 42 is fixedly connected to the inner wall of the slide rail frame 15, and the other end of the release spring 42 is fixedly connected to one end of the slider 41 close to the release switch 151, and the driven wheel 43 is rotatably connected in the rotation groove 411; The patient's legs are placed on the slot body 13, so that the driven wheel 43 contacts the patient's calf, the slider 41 is pushed into the inside of the slide rail frame 15, pressing the release switch 151, and after starting the air pump 11, the first cylinder 23 pushes the first transmission rack 212 to slide toward the first transmission gear 211. Under the action of the first transmission gear 211, the first transmission rack 212 is driven to move toward each other, and the symmetrically arranged first splints 22 are driven to move toward each other. When the first splint 22 contacts the patient's limbs, the first splint 22 continues to slide in the first support tube 214 until it contacts the contact switch 2141, completing the fixation of the patient's ankle, and at the same time starting the adjustment cylinder 12 to drive the sliding mounting shell 3 to slide away from the fixed mounting shell Body 2, since the human knee fossa is lower than the muscle areas on both sides of the knee, after the driven wheel 43 reaches the knee fossa, the conflict with the human leg is released, the release spring 42 pushes the slider 41 away from the slide rail frame 15, the release switch 151 pops up, the adjustment cylinder 12 stops, and the second cylinder 34 is started. The second cylinder 34 pushes the connecting plate 314 fixedly connected to the second transmission rack 312 and the second transmission rack 312 to slide toward the first transmission gear 211. Under the action of the second transmission gear 311, the second driven rack 313 and the connecting plate 314 fixedly connected to the second driven rack 313 are driven to move toward each other, and the symmetrically arranged second splints 33 are driven to move toward each other, and the appropriate pressure is maintained to complete the fixation of the patient's thigh.

[0018] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A novel leg fixing device for magnetic resonance examination, comprising a placing frame (1), an air pump (11) being fixedly provided on the bottom wall of the placing frame (1), an adjusting cylinder (12) being symmetrically fixedly provided on the bottom wall of the placing frame (1), a cylinder body of the adjusting cylinder (12) being connected to an exhaust port of the air pump (11), characterized in that: A groove body (13) is symmetrically provided on the bottom wall of the placement rack (1), a fixed installation shell (2) is fixedly provided on the bottom wall of the placement rack (1), the fixed installation shell (2) is located directly below the end of the groove body (13) away from the regulating cylinder (12), a first transmission assembly (21) is provided on the inner bottom wall of the fixed installation shell (2), a first clamping plate (22) is symmetrically provided on the first transmission assembly (21), a first cylinder (23) that cooperates with the first transmission assembly (21) in transmission is fixedly provided on the inner bottom wall of the fixed installation shell (2), and the cylinder body of the first cylinder (23) is connected to the exhaust port of the air pump (11). A sliding mounting shell (3) is slidably arranged on the bottom wall of the placement rack (1), the side wall of the sliding mounting shell (3) is fixedly connected to the piston rod end of the regulating cylinder (12), a second transmission assembly (31) is symmetrically arranged on the inner bottom wall of the sliding mounting shell (3), a pressure compensation assembly (32) is arranged on the second transmission assembly (31), a second clamping plate (33) is symmetrically arranged on the pressure compensation assembly (32), a second cylinder (34) that cooperates with the second transmission assembly (31) in transmission is fixedly arranged on the inner bottom wall of the sliding mounting shell (3), and the cylinder body of the second cylinder (34) is connected to the exhaust port of the air pump (11).

2. The novel leg fixation device for magnetic resonance imaging according to claim 1 is characterized in that: The second transmission assembly (31) comprises a second transmission gear (311), a second transmission rack (312) and a second driven rack (313); the second transmission gear (311) is rotatably connected to the inner bottom wall of the sliding mounting shell (3); the second transmission rack (312) is slidably engaged and connected to the inner bottom wall of the sliding mounting shell (3); the second driven rack (313) is slidably engaged and connected to the inner bottom wall of the sliding mounting shell (3); the second transmission rack (312) is rotatably engaged and connected to the inner bottom wall of the sliding mounting shell (3); The second driven rack (313) and the second transmission gear (311) are meshed with each other; the second transmission gear (312) and the second driven rack (313) are both fixedly provided with a connecting plate (314) at one end away from the second transmission gear (311); a sliding groove (315) is provided on a side wall of the connecting plate (314) close to the second transmission gear (311); and the side wall of any connecting plate (314) away from the second transmission gear (311) is fixedly connected to the piston rod of the second cylinder (34).

3. The novel leg fixation device for magnetic resonance imaging according to claim 2 is characterized in that: The pressure compensation assembly (32) comprises a compensation transmission gear (321), a movable transmission rack (322), a second support tube (323) and a second return spring (324); the compensation transmission gear (321) is coaxially rotatably connected to the top wall of the second transmission gear (311), the movable transmission rack (322) is slidably engaged in the slide groove (315), the movable transmission rack (322) meshes with the compensation transmission gear (321), and the second support tube (323) is fixedly connected to the top wall of the movable transmission rack (322). The second support tube (323) is fixedly connected with an air pipe (325) on its circumferential wall, and the other end of the air pipe (325) is fixedly connected with the inner cavity of the slide groove (315). The second clamping plate (33) is slidably connected to the inner wall of the second support tube (323) away from the movable transmission rack (322). The second return spring (324) is nested in the second support tube (323), and the two ends of the second return spring (324) are fixedly connected to the sliding shaft of the second clamping plate (33) and the inner wall of the second support tube (323) respectively.

4. The novel leg fixation device for magnetic resonance imaging according to claim 3 is characterized in that: The first transmission assembly (21) comprises a first transmission gear (211), a first transmission rack (212) and a first driven rack (213); the first transmission gear (211) is rotatably connected to the inner bottom wall of the fixed installation housing (2); the first transmission rack (212) is slidably engaged with the inner bottom wall of the fixed installation housing (2); the side wall of the first transmission rack (212) is fixedly connected to the piston rod end of the first cylinder (23); the first driven rack (213) is slidably engaged with the inner bottom wall of the fixed installation housing (2); the first transmission rack (212) and the first driven rack (213) are both meshed with the first transmission gear (211); and a first support tube (214) is fixedly provided on the top walls of the first transmission rack (212) and the first driven rack (213).

5. The novel leg fixation device for magnetic resonance imaging according to claim 4 is characterized in that: A contact switch (2141) is fixedly provided inside the first support tube (214), and the contact switch (2141) is electrically connected to the regulating cylinder (12). The first clamping plate (22) is slidably connected to the inner wall of the first support tube (214). A first return spring (2142) is nested inside the first support tube (214), and two ends of the first return spring (2142) are respectively fixedly connected to the sliding shaft of the first clamping plate (22) and the inner wall of the first support tube (214).

6. The novel leg fixation device for magnetic resonance imaging according to claim 5 is characterized in that: A slide rail frame (15) is fixedly provided on the top wall of the sliding mounting housing (3), a release switch (151) is fixedly provided on the inner wall of the slide rail frame (15), the release switch (151) is electrically connected to the regulating cylinder (12), and a detection component (4) is slidably engaged with the slide rail frame (15).

7. The novel leg fixation device for magnetic resonance imaging according to claim 6 is characterized in that: The detection assembly (4) comprises a slider (41), a release spring (42) and a driven wheel (43); the slider (41) is slidably connected to the slide rail frame (15); an end of the slider (41) away from the release switch (151) is provided with a rotation groove (411); one end of the release spring (42) is fixedly connected to the inner wall of the slide rail frame (15); the other end of the release spring (42) is fixedly connected to an end of the slider (41) close to the release switch (151); and the driven wheel (43) is rotationally connected in the rotation groove (411).

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