CN117796787B - Magnetic resonance imaging device - Google Patents

Abstract

The present invention relates to the technical field of tomographic scanning medical equipment, and specifically to a magnetic resonance imaging device. It includes a magnetic resonance imager, a scanning bed and a transfer vehicle, the scanning bed includes a base and a bed body, the bed body can move relative to the base, the transfer vehicle includes a vehicle body and a load-bearing plate, the load-bearing plate can slide along its own length direction, a docking joint is provided at one end of the vehicle body, a docking seam is provided on the end face of the base away from the magnetic resonance imager, and a docking mechanism is provided in the base. By docking the transfer vehicle where the patient is located with the scanning bed, the examinee can lie on the transfer vehicle for "assembly line" type inspection, and the docking joint can be inserted into the docking mechanism at any place at the docking seam. Under the action of the docking mechanism, the transfer vehicle and the scanning bed finally achieve precise alignment and connection, without deliberate alignment, to avoid jamming and equipment damage caused by improper docking.

Description

Magnetic resonance imaging device

Technical Field

The present invention relates to the technical field of tomography medical equipment, and in particular to a magnetic resonance imaging device.

Background technique

Magnetic resonance imaging has been widely used as a medical imaging device with high precision and wide application range. It is another major advancement in medical imaging after CT. When doing magnetic resonance imaging, it often takes a long time and is very inefficient due to many reasons such as cumbersome precautions. Therefore, patients need to cooperate with doctors to make preliminary preparations and cooperate with doctors to enter the device in a posture that is conducive to imaging to improve the efficiency of the examination. However, in some special cases, patients may not be able to cooperate with doctors to adjust their body positions, and some patients may even be unconscious or have difficulty in moving. In this case, they need to be transferred from the ward or other departments to the radiology scanning room by a transfer vehicle. After the transfer vehicle is in place, at least two medical staff are required to lift the patient onto the scanning bed for scanning. During the lifting process, it is easy to accidentally touch the patient, change the patient's posture, and cause further damage to the injured part. Improvements have been made in related technologies for this.

For example, a Chinese patent document with the authorization announcement CN 112618175 B discloses a transfer system for docking and transferring between a transfer vehicle and a square cabin CT. In this system, linear guide rails are set on both sides of the scanning bed, and the pallet for the patient to lie on the transfer vehicle is engaged with the transfer vehicle. After the transfer vehicle arrives at the scanning room, it moves to the top of the scanning bed through the linear guide rails, and the scanning bed rises and engages with the pallet, and then moves together to the CT scanner for scanning. Although this solution solves the trouble of medical staff carrying patients to a certain extent and realizes assembly line inspection, it cannot guarantee that the transfer vehicle can be accurately and quickly aligned with the guide rails in this solution, and medical staff need to adjust the posture and position of the transfer vehicle many times, which is troublesome to operate; at the same time, the above-mentioned solution adopts the method of up and down alignment, and the transfer vehicle is not connected to the scanning bed after it moves to the top of the scanning bed, and the position of the scanning bed cannot be reliably guaranteed, which affects the subsequent connection between the scanning bed and the transfer vehicle pallet.

The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of implication that the information constitutes the prior art already known to those skilled in the art.

Summary of the invention

In view of the deficiencies of the prior art, the present invention proposes a magnetic resonance imaging device, which can realize the alignment, connection and disengagement of a scanning bed and a transfer vehicle in the horizontal direction, has high positioning accuracy and is easy to operate.

A magnetic resonance imaging device of the present invention adopts the following technical solution: comprising:

Magnetic resonance imaging machines, which are used to scan patients;

The scanning bed includes a base and a bed body. The base is fixed to the ground, and the bed body can move relative to the base to adjust its relative position with the magnetic resonance imaging device.

The transfer vehicle comprises a vehicle body and a load-bearing plate, and the load-bearing plate can slide along its length direction, so as to be combined with the bed body and separated from the transfer vehicle after the transfer vehicle is aligned and connected with the scanning bed;

A docking joint is provided at one end of the vehicle body, and there are two docking joints which are arranged at intervals in the width direction of the transfer vehicle. A docking seam is provided on the end face of the base away from the magnetic resonance imager. A docking mechanism is provided in the base, and the docking mechanism includes a transmission structure, a connecting structure and a limiting structure. The limiting structure defines the alignment position of the scanning bed and the transfer vehicle and can control the transmission structure to stop running after being triggered. The docking joint can be inserted into the connecting structure arbitrarily from the docking seam and moved to the trigger limiting structure under the drive of the transmission structure.

Optionally, the transmission structure is a chain transmission structure, a mounting belt is slidably arranged inside the base, and the connecting structure includes a plurality of movable plates, which are arranged side by side on the mounting belt along the extension direction of the mounting belt, and the movable plates are grouped in pairs, and the ends of two movable plates in the same group that are away from each other are rotatably connected to the mounting belt, and elastic members are connected between all the movable plates and the mounting belt, and the initial elastic members cause the two movable plates in the same group to be in a closed state; a winding mechanism is arranged inside the scanning bed, and the winding mechanism can wind up the mounting belt, and then the movable plate can be reset after the scanning bed is separated from the transfer vehicle; the mounting belt runs through front and back, and an arc protrusion is arranged on the butt joint.

Optionally, the butt joint has a terminal end at one end close to the running direction of the transmission structure, and the other end is connected with an installation groove, the installation belt is slidably set between the butt joint and the installation groove, the movable plate starts from the right end of the installation belt and the total length is less than the length of the installation belt, and the end of the installation belt away from the movable plate is connected to the winding mechanism.

Optionally, the transmission structure is a belt transmission structure, and the connecting structure includes a plurality of movable plates, which are arranged side by side and surround the conveyor belt for one circle. The movable plates are grouped in pairs, and the ends of two movable plates in the same group that are away from each other are rotatably connected to the conveyor belt of the belt transmission mechanism. Elastic parts are connected between all the movable plates and the conveyor belt, and the initial elastic parts cause the two movable plates in the same group to be in a closed state; an arc protrusion is provided on the docking head.

Optionally, the limit structure is a travel switch.

Optionally, the limiting structure is a damper.

Optionally, the driving motor that drives the transmission structure to operate is a stepless speed regulating motor.

Optionally, the elastic member is a tension spring.

Optionally, both ends of the movable plate are configured as rounded structures.

Optionally, the two butt joints are symmetrically arranged relative to a center plane in the width direction of the vehicle body.

The beneficial effects of the present invention are as follows: in a magnetic resonance imaging device of the present invention, by using a method of docking the transfer cart where the patient is located and the scanning bed, the person being examined can make various preparations in advance and lie on the transfer cart for "assembly line" type inspection, thereby avoiding the time waste caused by each person being examined making various preparations after entering the inspection room, greatly improving efficiency, and avoiding the movement of patients, especially for patients with limited mobility or even losing consciousness, when facing the situation that the patient is unable to cooperate with the doctor, the inspection can still be effectively carried out; further, the docking joint can be arbitrarily inserted into the docking mechanism at the docking seam, and under the action of the docking mechanism, the transfer cart and the scanning bed can finally achieve precise alignment and connection without deliberate alignment, thereby avoiding jamming and equipment damage caused by improper docking.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG1 is a schematic diagram of the overall structure of a magnetic resonance imaging device according to the present invention;

FIG2 is a schematic diagram of a docking state of a magnetic resonance imaging device according to the present invention, in which one of the docking connectors is first inserted into a docking mechanism;

FIG3 is a schematic diagram of the structure of the transfer vehicle in the present invention;

FIG4 is a top view of the transfer vehicle of the present invention;

FIG5 is a side view of the transfer vehicle of the present invention;

FIG6 is a schematic diagram of the structure of the scanning bed in the present invention;

FIG7 is a side view of the scanning bed of the present invention;

Fig. 8 is a cross-sectional view of A-A in Fig. 7;

FIG9 is an enlarged view of point C in FIG8 ;

FIG. 10 is an enlarged view of point B in FIG. 7 .

In the figure:

100. Magnetic resonance imaging device;

200, scanning bed; 201, bed body; 202, sprocket; 203, chain; 204, movable plate; 205, tension spring; 207, mounting belt; 208, damper; 209, base;

300. Transfer vehicle; 301. Vehicle body; 302. Load-bearing plate; 303. Butt joint.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

As shown in FIGS. 1 to 10 , a magnetic resonance imaging device provided by an embodiment of the present invention includes a magnetic resonance imager 100, a scanning bed 200 and a transfer vehicle 300; the magnetic resonance imager 100 is installed in the examination room of the radiology department and can scan patients. The magnetic resonance imager 100 is connected to a data processing module and a terminal display module, and the information after scanning is processed by the data processing module and then imaged through the terminal display module.

The scanning bed 200 is installed in the examination room of the radiology department. The scanning bed 200 includes a bed body 201 and a base 209. The base 209 is fixed to the ground. The bed body 201 can move relative to the base 209 to adjust its relative position with the magnetic resonance imager 100 so as to send the patient into the magnetic resonance imager 100 for scanning. In this embodiment, the bed body 201 can at least move forward and backward to send the patient into or out of the magnetic resonance imager 100. In other embodiments, the bed body 201 is configured to be able to rise and fall and move left and right to achieve fine adjustment of its relative position with the magnetic resonance imager 100. It can be understood that a control device is provided inside the base 209, and the control device is used to control the movement of the bed body 201.

The transfer cart 300 includes a cart body 301 and a load-bearing plate 302. The load-bearing plate 302 can slide along its own length direction so that after the transfer cart 300 is aligned and connected with the scanning bed 200, it can be combined with the bed body 201 and separated from the transfer cart 300; a docking joint 303 is provided at one end of the cart body 301, and there are two docking joints 303 and they are arranged at intervals in the width direction of the transfer cart 300. Furthermore, the two docking joints 303 are symmetrically arranged with respect to the center plane of the cart body 301 in the width direction, so that after the transfer cart 300 is aligned and connected with the scanning bed 200, the force is more balanced and the connection is more reliable.

A docking joint is provided on the end surface of the base 209 away from the magnetic resonance imager 100, and a docking mechanism is provided inside the base 209. The docking joint 303 can be inserted into the docking mechanism at any time from the docking joint, and the scanning bed 200 and the transfer vehicle 300 are aligned and connected under the action of the docking mechanism. Further, the docking mechanism includes a transmission structure, a connection structure and a limit structure. The limit structure defines the alignment position of the scanning bed 200 and the transfer vehicle 300 and can control the transmission structure to stop running after being triggered. The docking joint 303 can be inserted into the connection structure at any time from the docking joint and move to the trigger limit structure under the drive of the transmission structure. After the limit structure is triggered, the transmission structure is controlled to stop running, thereby enabling the scanning bed 200 and the transfer vehicle 300 to be aligned and connected. The present invention uses a method of docking the transfer cart 300 where the patient is located with the scanning bed 200, so that the person being examined can make various preparations in advance and lie on the transfer cart 300 for "assembly line" inspection, thereby avoiding the time waste caused by each person being examined entering the inspection room and making various preparations, greatly improving efficiency, and avoiding the movement of patients, especially for patients with limited mobility or even losing consciousness, when the patient is unable to cooperate with the doctor, the inspection can still be effectively carried out. Further, the docking joint 303 can be inserted into the docking mechanism at any place at the docking seam. Under the action of the docking mechanism, the transfer cart 300 and the scanning bed 200 can finally achieve precise alignment and connection without deliberate alignment, thus avoiding jamming and equipment damage caused by improper docking.

In one embodiment, the transmission structure is a chain transmission structure. It can be understood that the chain transmission structure includes a chain 203 and a sprocket 202. There are two sprockets 202, both of which are rotatable around a vertical axis and are arranged on a base 209 of a scanning bed 200. The chain 203 is wound around the two sprockets 202, one of which is connected to a driving motor and can be driven by the driving motor to rotate.

A mounting belt 207 is slidably arranged inside the base 209, and the connection structure includes a plurality of movable plates 204, which are arranged side by side on the mounting belt 207 along the extension direction of the mounting belt 207. The movable plates 204 are grouped in pairs, and the ends of the two movable plates 204 in the same group that are away from each other are rotatably connected to the mounting belt 207. Elastic members are connected between all the movable plates 204 and the mounting belt 207, and the initial elastic members cause the two movable plates 204 in the same group to be in a closed state, that is, the gap between the ends of the two movable plates 204 in the same group that are close to each other is the smallest; the total length of all the movable plates 204 is less than the length of the mounting belt 207, and a winding mechanism is arranged inside the scanning bed 200, which can be used for the mounting belt 207. The mounting belt 207 is wound up, and then the movable plate 204 can be reset after the scanning bed 200 is separated from the transfer vehicle 300. The mounting belt 207 penetrates front and back, so that the docking joint 303 passes through the movable plate 204 and the mounting belt 207 and is then inserted into the adjacent sleeve of the chain transmission structure; the docking joint 303 is a plate-like structure vertically arranged to extend front and back (the direction of entering and exiting the magnetic resonance imager 100 is the front and back direction), and arc protrusions are arranged on both side surfaces in the width direction of the docking joint 303. The arc protrusions enable the docking joint 303 to be inserted into the two movable plates 204 of the same group to connect the scanning bed 200 with the transfer vehicle 300, and can be pulled out to disconnect the scanning bed 200 from the transfer vehicle 300.

Preferably, in this embodiment, the butt joint has a terminal end at one end (on the right side in the figure) close to the running direction of the transmission mechanism, and is penetrated by a mounting groove at the other end (on the left side in the figure), and the mounting belt 207 is slidably arranged between the butt joint and the mounting groove, and the movable plate 204 starts from the right end of the mounting belt 207 and has a total length less than the length of the mounting belt 207, and the end of the mounting belt 207 away from the movable plate 204 is connected to the winding mechanism; in other embodiments, the butt joint can also be arranged to have mounting grooves penetrated on both sides, the movable plate 204 is located in the middle of the mounting belt 207 and has a total length less than the length of the mounting belt 207, one end of the mounting belt 207 is connected to the winding mechanism so that it can be actively retracted and unreeled, and the other end of the mounting belt 207 is connected to the wire wheel so that it can be passively retracted and unreeled. More specifically, slideways are provided for the upper and lower limiting surfaces of the joint and the mounting groove, and the mounting belt 207 is slidably arranged in the slideways; the mounting belt 207 is made of a material with a certain supporting force to facilitate the installation of the movable plate 204, such as rubber; in the same group of movable plates 204, a protrusion is provided on the top of one of the movable plates 204 (the left movable plate 204 in the figure) for connecting the elastic member, and the other end of the elastic member is connected to the right side wall of the mounting belt 207 (the mounting belt 207 is provided with an avoidance recess for installing the elastic member); a protrusion is provided on the bottom of the other movable plate 204 (the right movable plate 204 in the figure) for connecting the elastic member, and the other end of the elastic member is connected to the left side wall of the mounting belt 207. The preferred elastic member in this embodiment is a tension spring 205.

When the magnetic resonance imaging device of the present invention is in use, the patient is located on the transfer cart 300, and the medical staff uses the transfer cart 300 to transport the patient to the examination room (the transfer cart 300 has universal wheels), and then docks the transfer cart 300 with the scanning bed 200. The medical staff can push the transfer cart 300 so that the docking joint 303 of the transfer cart 300 is inserted into the docking joint. Two docking joints 303 can be inserted at the same time, or one docking joint 303 can be inserted first. If two docking joints 303 are inserted at the same time, the transfer cart 300 and the scanning bed 200 may need to be relatively aligned more, and the alignment requirement will inevitably limit the freedom of operation. Therefore, the docking joint 303 on the right side of the transfer cart 300 can be inserted into the docking joint using the state of Figure 2.

The butt joint 303 pushes a group of movable plates 204 to open them, and the two tension springs 205 of the group of movable plates 204 are extended to enlarge the gap between the two movable plates 204. When the arc protrusion of the butt joint 303 passes through the gap of the group of movable plates 204, the two tension springs 205 are reset, and the gap between the group of movable plates 204 becomes smaller, preventing the butt joint 303 from falling out. In order to facilitate the insertion of the butt joint 303 into the gap between the two movable plates 204, both ends of the movable plates 204 are set to rounded structures.

After the docking joint 303 is inserted into the docking seam, it will enter the gap between the two adjacent sleeves of the chain 203. The operator will start the drive motor to make the sprocket 202 and the chain 203 start to transmit. Because the docking joint 303 is inserted in the gap of the chain 203, it will move with the chain 203. Since the docking joint 303 is inserted in the gap of the adjacent sleeves of the chain 203, during the movement of the chain 203, the transfer vehicle 300 will gradually swing to the state of Figure 1, and the joint on the left side of the transfer vehicle 300 will also enter the docking seam and will not fall out.

In this process, since the docking joint 303 is inserted into the gap between the adjacent movable plates 204, the movement of the transfer vehicle 300 will drive the installation belt 207 where the movable plate 204 is located to move together, and the installation belt 207 is unwound.

After the transporter 300 is aligned, it gradually moves to the right. When the transporter 300 moves to the docking joint 303 and triggers the limit structure, it means that the transporter 300 and the scanning bed 200 have been aligned. The limit structure controls the driving motor of the transmission structure to stop rotating, and the docking is completed. After that, the medical staff starts the motor on the transporter 300 to move the load-bearing plate 302 toward the bed body 201. The load-bearing plate 302 and the bed body 201 are provided with mutually matching guide rails. When the load-bearing plate 302 and the bed body 201 are completely assembled, the position of the scanning bed 200 relative to the magnetic resonance imaging device can be adjusted to synchronously send the bed body 201 and the load-bearing plate 302 into the magnetic resonance imaging device 100 for detection and imaging. It should also be noted that a locking structure is provided between the bed body 201 of the scanning bed 200 and the load-bearing plate 302 of the transfer vehicle 300. After the bed body 201 and the load-bearing plate 302 are combined, they can be locked to prevent the bed body 201 and the load-bearing plate 302 from moving relative to each other during the inspection process. The locking structure can be a spring pin or other structure that can achieve locking.

After the test is completed, the bed body 201 and the load-bearing plate 302 withdraw from the magnetic resonance imaging device 100, and the load-bearing plate 302 returns to the vehicle body 301. The transfer vehicle 300 is pulled backward to remove the joint from the gap of the movable plate 204, and the winding mechanism is started to wind up the mounting belt 207, so that all the movable plates 204 are reset, and the next patient can be tested.

In other embodiments, different from the above embodiments, the chain drive structure in the docking mechanism can be replaced with a belt drive structure. It can be understood that the belt drive structure includes a pulley and a conveyor belt. There are two pulleys and both are rotatable around a vertical axis and are arranged on the base 209 of the scanning bed 200. The conveyor belt is wound around the two pulleys, one of which is connected to a drive motor and can be rotated under the drive of the drive motor.

That is to say, the transmission structure is a belt transmission structure, and the connection structure includes a plurality of movable plates 204, which are arranged side by side and circle around the conveyor belt. The movable plates 204 are arranged in pairs, and the ends of the two movable plates 204 in the same group that are away from each other are rotatably connected to the conveyor belt of the belt transmission mechanism. Elastic parts are connected between all movable plates 204 and the conveyor belt, and the initial elastic parts cause the two movable plates 204 in the same group to be in a closed state; a circular arc protrusion is arranged on the docking joint 303, and when in use, the docking joint 303 is inserted into the movable plate 204 from any position of the docking joint. Driven by the conveyor belt and the movable plate 204, the docking joint 303 drives the transfer vehicle 300 to move to align with the scanning bed 200, and the conveyor belt stops rotating to complete the docking. After the inspection is completed, the transfer vehicle 300 can be withdrawn, because the movable plate 204 rotates in a ring with the conveyor belt, so there is no need to reset the movable plate 204.

In a further embodiment, the limit structure is a travel switch. When the docking head 303 touches the limit switch, the driving motor of the transmission structure is triggered to stop, thereby completing the docking.

In other embodiments, the limiting structure can also be a damper 208. The damper 208 is configured to align the scanning bed 200 with the transfer cart 300 when it is compressed to a preset position. When the docking head 303 touches the damper 208, as the transmission structure continues to rotate, the docking head 303 continues to move and compress the damper 208. When the position of the damper 208 reaches the specified position, the drive motor of the transmission structure is triggered to stop, and the docking is completed. Setting the limiting structure as the damper 208 can play a certain shock-absorbing and buffering role, preventing the impact caused by the stopping of the rotating cart when the scanning bed and the transfer cart 300 are aligned, making the patient feel as comfortable as possible, and reducing the impact on the patient.

In a further embodiment, when the limiting structure is the damper 208, the driving motor that drives the transmission structure is a stepless speed regulating motor. After the docking joint 303 touches the damper 208, as the damper 208 is compressed, the load gradually increases, which can appropriately reduce the rotation speed of the driving motor, thereby reducing the moving speed of the scanning bed 200 when the scanning bed 200 and the transfer vehicle 300 are about to be aligned, reducing the impact caused by the emergency stop, and further reducing the impact on the patient.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A magnetic resonance imaging device, comprising: Magnetic resonance imaging machines, which are used to scan patients; The scanning bed includes a base and a bed body. The base is fixed to the ground, and the bed body can move relative to the base to adjust its relative position with the magnetic resonance imaging device. The transfer vehicle comprises a vehicle body and a load-bearing plate, and the load-bearing plate can slide along its own length direction, so as to be combined with the bed body and separated from the transfer vehicle after the transfer vehicle is aligned and connected with the scanning bed; A docking joint is provided at one end of the vehicle body, and there are two docking joints which are arranged at intervals in the width direction of the transfer vehicle. A docking joint is provided on the end face of the base away from the magnetic resonance imager. A docking mechanism is provided in the base, and the docking mechanism includes a transmission structure, a connection structure and a limit structure. The limit structure defines the alignment position of the scanning bed and the transfer vehicle and can control the transmission structure to stop running after being triggered. The docking joint can be inserted into the connection structure at will from the docking joint and moved to the trigger limit structure under the drive of the transmission structure. The transmission structure is a chain transmission structure, a mounting belt is slidably arranged inside the base, and the connection structure includes a plurality of movable plates, which are arranged side by side on the mounting belt along the extension direction of the mounting belt, and the movable plates are grouped in pairs, and the ends of the two movable plates in the same group that are away from each other are rotatably connected to the mounting belt, and elastic members are connected between all the movable plates and the mounting belt, and the initial elastic members cause the two movable plates in the same group to be in a closed state; a winding mechanism is arranged inside the scanning bed, and the winding mechanism can wind up the mounting belt, and then reset the movable plate after the scanning bed is separated from the transfer vehicle; the mounting belt runs through front and back, and an arc protrusion is arranged on the butt joint; The butt joint has a terminal end at one end close to the running direction of the transmission structure, and the other end is penetrated and connected with an installation groove. The installation belt is slidably arranged between the butt joint and the installation groove. The movable plate starts from the right end of the installation belt and the total length is less than the length of the installation belt. The end of the installation belt away from the movable plate is connected to the winding mechanism. 2. A magnetic resonance imaging device according to claim 1, characterized in that the transmission structure is a belt transmission structure, the connecting structure includes a plurality of movable plates, the plurality of movable plates are arranged side by side and surround the conveyor belt for one circle, the movable plates are grouped in pairs, the ends of two movable plates in the same group that are away from each other are rotatably connected to the conveyor belt of the belt transmission mechanism, elastic parts are connected between all movable plates and the conveyor belt, and the initial elastic parts cause the two movable plates in the same group to be in a closed state; an arc protrusion is arranged on the butt joint. 3. A magnetic resonance imaging device according to claim 1, characterized in that the limiting structure is a travel switch. 4 . The magnetic resonance imaging device according to claim 1 , wherein the limiting structure is a damper. 5. A magnetic resonance imaging device according to claim 4, characterized in that the driving motor for driving the transmission structure to operate is a stepless speed regulating motor. 6. A magnetic resonance imaging device according to claim 1 or 2, characterized in that the elastic member is a tension spring. 7. A magnetic resonance imaging device according to claim 1 or 2, characterized in that both ends of the movable plate are configured as rounded structures. 8. A magnetic resonance imaging device according to claim 1, characterized in that the two butt joints are symmetrically arranged with respect to a center plane in a width direction of the vehicle body.