CN118252489A - Simulation load device for assisting lower limb joint magnetic resonance imaging - Google Patents

Abstract

The present invention relates to a simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints, which comprises a head-shoulder fixation module, a foot-ankle fixation module and a sole force-applying module installed on a magnetic resonance examination bed; the head-shoulder fixation module comprises a fixed base plate, a head-neck fixation component connected to the fixed base plate and a shoulder fixation component symmetrically installed on the fixed base plate; the foot-ankle fixation module comprises a vertically arranged force transmission plate, and a side of the force transmission plate close to the head-shoulder fixation module is symmetrically installed with the foot-ankle fixation component; the sole force-applying module comprises a mounting seat and a force-applying component on the mounting seat for driving the force transmission plate to move horizontally. Compared with the prior art, the simulated weight-bearing device of the present invention can directly simulate weight-bearing on the lower limb joints and maintain the stability of the upper limbs during magnetic resonance imaging of the lower limb joints, and also has the advantages of high flexibility, high comfort, and precise force application.

Description

A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints

Technical Field

The invention relates to the technical field of medical auxiliary equipment, and in particular to a simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints.

Background technique

Radiological examinations are now widely used in clinical practice, especially in the lower limb joints, where they provide outstanding auxiliary diagnostic efficacy. These include digital radiography (DR), computer tomography (CT), and magnetic resonance imaging (MRI). The soft tissue contrast of MRI is significantly better than that of DR and CT, and is particularly suitable for the observation of joint space, ligament, cartilage, muscle, and bone injuries.

The symptoms and signs of non-tumor-related diseases of the lower limb joints are often aggravated when weight-bearing and relieved when lying down. Common clinical symptoms include knee varus and valgus, flat feet, and arthritis. Due to various reasons, the articular cartilage is worn, the balance structure of soft tissue and bone joints is destroyed, and then the lower limb joints are deformed and the force line is abnormal, causing severe pain, limited movement, fractures and other risks. Therefore, clarifying the degree of cartilage wear and joint biomechanics under weight-bearing is the key to ensuring the subsequent formulation of treatment plans.

It is reported that the most advanced open MRI in the industry is now available abroad, which can image the spine and lower limb joints under the human body's weight-bearing state. However, due to factors such as the construction technology and cost of MRI equipment and actual clinical application scenarios, the country still mostly uses traditional magnetic resonance imaging equipment, that is, a combination of an image acquisition system and an examination bed, to examine the patient in the supine position. Its disadvantage is that it cannot truly reflect the anatomical structure and functional status of the bones, muscles and joints of the lower limbs of the patient under weight-bearing conditions. If MRI photography can be performed on patients under weight-bearing conditions or simulated weight-bearing conditions, this will greatly help the accurate diagnosis and treatment of non-tumor-related diseases of the lower limb joints.

CN109171798A discloses a lower limb simulated load-bearing traction device, which includes components such as a waist belt, shoulder straps, a weight scale, a cable winch, and a foot pressure plate. It can fix the human body through the waist belt and shoulder straps and apply traction to the human body, and apply weight to the human body by adjusting the length of the traction cable. When the weight reading of the foot pressure plate matches the value of the patient standing on the weight scale of the same specification, the CT scan begins. CN116725568A discloses a CT system with a load-bearing simulation device, which includes components such as a CT inspection device, an inspection bed, various body wrapping belts, a pressure sensor, a traction device, and a control unit. It can automatically control and adjust the weight and position applied to the patient according to the patient's weight and posture, so that the patient can simulate the physiological load state of the joints when standing in a comfortable lying position, thereby obtaining more accurate CT image data. CN219397311U discloses a horizontal lower limb weight-bearing simulation device and a CT radiography system. The device includes a seat, a pressurizing platform, an electronic scale and other devices. It can bind the patient through a safety belt and a traction belt, and operate the pressurizing platform to pressurize the patient's lower limbs, so that the simulated pressure can be visually viewed through the electronic scale value to meet the specific weight-bearing requirements. The above three existing methods all only mention CT imaging. CT can scan the lower limb joints or the entire length of the lower limbs under simulated weight-bearing conditions, and later obtain relevant data through image processing and analysis. However, due to the poor soft tissue contrast, large radiation dose, ease of operation, force size and force position accuracy and many other factors, DR is still used clinically for weight-bearing radiography of the lower limb joints or the entire length of the lower limbs and MRI for anatomical structure observation.

CN216417165U discloses an MRI simulated weight-bearing device, which simulates the pressure on the shoulder and the subsequent adjustment of the pressure on the shoulder during MRI scanning by setting components such as vertical plates, limit wheels, sleeves, support rods, card plates, shift plates and screw rods. However, although the above method takes into account the imaging principle and particularity of MRI, the device uses MRI compatible materials to reduce the impact of the device on the uniformity of the magnetic field, making MRI lower limb joint photography under weight-bearing state possible, but in the process of applying pressure to the shoulder, the force will be lost during the conduction process, the force applied to the lower limb joints is not accurate enough, and there is no fixation of the upper limbs and head and shoulders, resulting in poor limb stability of the patient during the examination.

Therefore, a simulated weight-bearing device that directly applies force to the lower limb joints remains to be developed to assist in magnetic resonance imaging of the lower limb joints.

Summary of the invention

The purpose of the present invention is to provide a simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints in order to directly simulate weight-bearing on the lower limb joints and maintain the stability of the upper limbs during magnetic resonance imaging.

The purpose of the present invention can be achieved by the following technical solutions:

A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints, comprising a head-shoulder fixation module, a foot-ankle fixation module and a sole force application module installed on a magnetic resonance examination bed;

The head and shoulder fixation module includes a fixed base plate, a head and neck fixation component connected to the fixed base plate, and a shoulder fixation component symmetrically mounted on the fixed base plate;

The foot and ankle fixation module comprises a vertically arranged force transmission plate, and a foot and ankle fixation assembly is symmetrically mounted on one side of the force transmission plate close to the head and shoulder fixation module;

The sole force application module comprises a mounting seat and a force application component on the mounting seat for driving the force transmission plate to move horizontally.

Furthermore, a slot is provided on the fixed base plate, and the shoulder fixing components are provided with buckles that can slide along the slot.

Furthermore, the inner side surfaces of the head and neck fixing component and the shoulder fixing component are respectively arc surfaces adapted to the contours of the head and shoulders.

Furthermore, the inner sides of the head and neck fixing assembly and the shoulder fixing assembly are provided with sponge pads to improve the comfort during examination.

Furthermore, the ankle fixing assembly includes a pedal connected to the force transmission plate and in direct contact with the sole of the foot, and shaping sponges standing on both sides of the pedal, and straps for fixing the ankle are connected between the shaping sponges. The shaping sponge is a high-density shaping sponge.

Furthermore, the high-density shaping sponge is a polyurethane soft foam sponge of 35d-50d. Wherein d represents the weight of sponge per cubic meter, and 35d means that the weight of sponge per cubic meter reaches 35kg. The heavier the weight of sponge per cubic meter, the greater the density of the sponge and the better the supporting force.

Furthermore, the force transmission plate includes a fixed vertical plate and movable vertical plates slidably arranged at both ends of the fixed vertical plate.

Furthermore, the ankle fixing components are all arranged on the movable vertical plate, and the back of the ankle fixing components are fixedly connected with a rotating shaft penetrating the movable vertical plate, and the part of the rotating shaft extending out of the movable vertical plate is connected with a locking component.

Furthermore, the locking assembly includes a ratchet gear fixedly sleeved on the rotating shaft and a locking claw arranged on the back of the movable vertical plate. When the rotating shaft rotates to a suitable angle, the locking claw is engaged with the tooth groove of the ratchet gear to lock and fix.

Furthermore, the movable vertical plate is provided with angle scale lines corresponding to the rotation of the rotating shaft.

Furthermore, the force-applying component is a nylon cylinder, which includes a fixed portion mounted on a mounting seat and a telescopic portion connected to a side of the force transmission plate facing away from the head-shoulder fixing module.

Furthermore, the force-applying components are arranged at equal intervals, and the force-applying components are all connected to the pressurizing components through conduits.

Furthermore, the pressurizing component is an all-copper double-cylinder air compressor, which is installed in the equipment room.

Furthermore, the pressurizing components are all connected to the pressure control components.

Furthermore, the pressure control component includes a PLC controller, and the solenoid valve of the pressurizing component is controlled by the PLC controller to control the pressurizing process of the pressurizing component.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The simulated weight-bearing device of the present invention can directly simulate weight-bearing on the lower limb joints during magnetic resonance imaging by setting up the foot and ankle fixation module and the sole force application module. At the same time, the patient's upper limbs can be stabilized by setting up the head and shoulder fixation module to maintain the stability of the patient's upper limbs during examination.

(2) The simulated weight-bearing device of the present invention can reflect the anatomical structure and functional status of the patient's bones, muscles and joints under the weight-bearing state as realistically as possible when the patient is in the supine position for magnetic resonance imaging examination, thereby reducing the force loss during the pressure application process and effectively improving the accuracy of magnetic resonance imaging of the lower limb joints.

(3) The shoulder fixation assembly and the ankle fixation assembly of the present invention can be adjusted according to the patient's body shape, thereby meeting the examination needs of patients of different body shapes.

(4) The ankle fixation assembly of the present invention can adjust the internal rotation or external rotation angle of the foot to meet the patient's comfort and clinical related needs.

(5) The inner side surfaces of the head and neck fixation assembly and the shoulder fixation assembly of the present invention are arc surfaces that adapt to the contours of the head and shoulders, respectively, and are both provided with sponge cushions to improve the comfort of the patient during examination.

(6) The gas pressurizing component of the present invention can make the magnetic field uniformity more stable, and at the same time, combined with the pressure control component, the applied pressure can be more precise.

(7) The simulated weight-bearing device of the present invention takes into account the imaging principle and particularity of MRI and adopts MRI-compatible materials to reduce the impact of the device on the uniformity of the magnetic field.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of an MRI examination using the simulated weight-bearing device of the present invention.

FIG. 2 is a schematic structural diagram of a head and shoulder fixation module of the present invention.

FIG. 3 is a schematic structural diagram of an ankle fixation module according to Embodiment 2 of the present invention.

FIG. 4 is a schematic diagram showing the connection between the ankle fixation module and the sole force application module of Embodiment 2 of the present invention.

FIG. 5 is a schematic structural diagram of an ankle fixation module according to Embodiment 3 of the present invention.

FIG. 6 is a schematic diagram of the back side of the ankle fixation module according to Embodiment 3 of the present invention.

FIG. 7 is a schematic diagram showing the distribution of the force-applying components of Embodiment 3 of the present invention.

Description of the markings in the figure:

1- MRI examination bed;

2-head and shoulder fixing module, 21-fixed base plate, 211-slot, 22-head and neck fixing assembly, 23-shoulder fixing assembly;

3-foot and ankle fixation module, 31-force transmission plate, 311-fixed vertical plate, 312-movable vertical plate, 313-angle scale line, 32-foot and ankle fixation assembly, 321-pedal, 322-shaped sponge, 323-binding strap, 324-rotating shaft, 325-locking assembly;

4-plantar force module, 41-mounting seat, 42-force component, 421-fixing part, 422-retractable part, 43-pressurizing component, 44-pressure control component.

Detailed ways

The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

In the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

Embodiment 1:

A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints, as shown in FIG1 , comprises a head-shoulder fixation module 2, a foot-ankle fixation module 3 and a sole force application module 4 installed on a magnetic resonance examination bed 1.

The head and shoulder fixation module 2 comprises a fixed base plate 21, a head and neck fixation assembly 22 and a shoulder fixation assembly 23. The head and neck fixation assembly 22 is connected to the long side of the fixed base plate 21, and the shoulder fixation assembly 23 is symmetrically mounted on the fixed base plate 21.

The foot and ankle fixation module 3 includes a vertically arranged force transmission plate 31 , and a foot and ankle fixation assembly 32 is symmetrically mounted on one side of the force transmission plate 31 close to the head and shoulder fixation module 2 , for fixing the patient's foot and ankle.

The sole force application module 4 comprises a mounting seat 41 mounted on the magnetic resonance examination bed 1 , and a force application component 42 for driving the force transmission plate 31 to move horizontally is mounted on the mounting seat 41 .

When the patient undergoes MRI of the lower limb joints, the patient needs to lie flat on the MRI examination bed 1. The two feet are placed in the foot and ankle fixation components 32 respectively, and the head and shoulder fixation module 2 is adjusted so that the head and shoulders are respectively placed in the head and neck fixation component 22 and the shoulder fixation component 23. According to the patient's weight, the force application component 42 is activated to apply the required simulated weight pressure to the force transmission plate 31, so that the force transmission plate 31 moves horizontally to squeeze the foot and ankle fixation component 32, thereby realizing the simulated weight-bearing condition in the standing state.

Embodiment 2:

A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints comprises a head-shoulder fixing module 2, a foot-ankle fixing module 3 and a sole force applying module 4 which are installed on a magnetic resonance examination bed 1.

As shown in Figure 2, the head and shoulder fixation module 2 includes a fixed base plate 21, a head and neck fixation assembly 22 and a shoulder fixation assembly 23. The head and neck fixation assembly 22 is connected to the long side of the fixed base plate 21, and the shoulder fixation assembly 23 is symmetrically mounted on the fixed base plate 21. A card slot 211 is provided on the fixed base plate 21, and the shoulder fixation assembly 23 is provided with a buckle that can slide along the card slot 211, so as to be adjusted according to the different body shapes of the patient to better improve the stability of the upper limbs. The inner side surfaces of the head and neck fixation assembly 22 and the shoulder fixation assembly 23 are respectively curved surfaces that adapt to the contours of the head and shoulders, and the inner side surfaces of the head and neck fixation assembly 22 and the shoulder fixation assembly 23 are provided with sponge cushions to improve the comfort of the patient during the examination. The head and shoulder fixation module 2 can be connected to the magnetic resonance examination bed 1 through the fixed slots at the bottom of the head and neck fixation assembly 22 and the shoulder fixation assembly 23 to improve the stability during the magnetic resonance examination.

As shown in FIG3 , the foot and ankle fixation module 3 includes a vertically arranged force transmission plate 31, and two foot and ankle fixation components 32 are symmetrically installed on one side of the force transmission plate 31 close to the head and shoulder fixation module 2, which are used to fix the feet of the patient under examination. The foot and ankle fixation component 32 includes a pedal 321 that is in direct contact with the sole of the foot and a shaping sponge 322 standing on both sides of the pedal 321, and a strap 323 for fixing the ankle is connected between the shaping sponge 322. The shaping sponge selected in this embodiment is a high-density polyurethane soft foam sponge, specifically a 40d high-density polyurethane soft foam sponge, which has both good comfort and support performance.

As shown in FIG4 , the sole force module 4 includes a mounting base 41 fixedly mounted on the magnetic resonance examination bed 1, and a force component 42 for driving the force transmission plate 31 to move horizontally is mounted on the mounting base 41. The force component 42 of this embodiment is a nylon cylinder, and the fixed portion 421 of the nylon cylinder is mounted on the mounting base 41, and the telescopic portion 422 of the nylon cylinder is connected to the side of the force transmission plate 31 away from the head and shoulder fixing module 2. In this embodiment, multiple nylon cylinders are arranged at equal intervals, and each nylon cylinder is connected to a pressurizing component 43 in the equipment room through a conduit, which is used to drive the nylon cylinder to apply force to the force transmission plate 31. The pressurizing component 43 of this embodiment is an all-copper double-cylinder air compressor.

Embodiment 3:

The present embodiment provides a simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints. The distance between the foot and ankle fixation components 32 can be adjusted according to the patient's body shape. The foot and ankle fixation components 32 can also be rotated to adjust the internal rotation or external rotation of the patient's ankle to meet the patient's comfort and clinical related needs.

As shown in Fig. 5-7, the difference from the second embodiment is that the force transmission plate 31 of the present embodiment includes a fixed vertical plate 311 and a movable vertical plate 312 slidably arranged at both ends of the fixed vertical plate 311. The ankle fixing components 32 are all arranged on the movable vertical plate 312, and the back of the ankle fixing components 32 is fixedly connected with a rotating shaft 324 that penetrates the movable vertical plate 312, and the part of the rotating shaft 324 that extends out of the movable vertical plate 312 is connected with a locking component 325. The locking component 325 includes a ratchet gear 3251 fixedly sleeved on the rotating shaft 324 and a locking claw 3252 arranged on the back of the movable vertical plate 312. When the rotating shaft 324 rotates to a suitable angle, the locking claw 3252 is engaged with the tooth groove of the ratchet gear 3251 to lock and fix. The movable vertical plate 312 is provided with an angle scale line 313 corresponding to the rotation of the rotating shaft 324, and the top of the pedal 321 of the ankle fixing assembly 32 is also connected with a conical indicator arrow, which is convenient for quantitatively observing the actual angle of the foot internal rotation or external rotation. The fixed vertical plate 311, the movable vertical plate 312, the rotating shaft 324 and the locking assembly 325 of this embodiment are all made of high-strength nylon plastic material without metal.

Embodiment 4:

The present embodiment provides a simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints and a specific method of using the device. The simulated weight-bearing device of the present embodiment comprises a head-shoulder fixation module 2, a foot-ankle fixation module 3 and a sole force application module 4 installed on a magnetic resonance examination bed 1, wherein the specific setting of the head-shoulder fixation module 2 refers to Example 2, and the specific setting of the foot-ankle fixation module 3 refers to Example 3.

The plantar force module 4 includes a mounting base 41 fixedly mounted on the magnetic resonance examination bed 1, on which is mounted a nylon cylinder (force component 42) for driving the force transmission plate 31 to move horizontally. The fixed part 421 of the nylon cylinder is mounted on the mounting base 41, and the telescopic part 422 of the nylon cylinder is connected to the force transmission plate 31.

In this embodiment, a total of 6 nylon cylinders are provided. A nylon cylinder is provided on each of the two movable vertical plates 312 and the fixed vertical plate 311, so that the nylon cylinders are evenly distributed while ensuring uniform force transmission, and the thrust of the nylon cylinders is directly transmitted to the force transmission plate 31. Each nylon cylinder is connected to the all-copper double-cylinder air compressor (pressurization component 43) in the equipment room through a rubber conduit. The air compressor is connected to a pressure control component 44 with a PLC controller. The pressure control component 44 can control the solenoid valve of the air compressor and can adjust the intake time and frequency of the compressed air of the air compressor, and convert the working pressure of the cylinder into the thrust of the cylinder according to the piston area of the cylinder and the working pressure of the cylinder, thereby indirectly controlling the pressure and time applied by the force transmission plate 31 to the patient's foot.

When a patient needs to undergo magnetic resonance imaging of the lower limb joints, the specific examination steps are as follows:

1. Weigh yourself and determine the amount of pressure to be applied.

2. Lie flat on the MRI bed 1, place both feet in the foot and ankle fixation components 32, tie the straps 323, and adjust the head and shoulder fixation module 2 so that the head and shoulders are respectively in the head and neck fixation component 22 and the shoulder fixation component 23, and connect the head and shoulder fixation module 2 and the MRI bed 1 to the fixed slots to ensure the stability of the upper limbs.

3. The distance between the ankle fixation components 32 can be adjusted according to the patient's body shape. The ankle fixation components 32 can also be rotated to adjust the internal rotation or external rotation of the patient's foot to meet the needs of different examinations.

4. Adjust the position of the nylon cylinder so that it is evenly dispersed, turn on the air compressor in the equipment room, and adjust the intake time and frequency of the compressed air through the pressure control component 44. Control the pressure applied by the nylon cylinder to the ankle fixation component 32 to be equivalent to one's own body weight to simulate the actual load-bearing condition in a standing position, and then perform a magnetic resonance examination.

The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims (10)

1. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints, characterized in that it comprises a head-shoulder fixation module (2), a foot-ankle fixation module (3) and a sole force application module (4) installed on a magnetic resonance examination bed (1); The head and shoulder fixing module (2) comprises a fixing base plate (21), a head and neck fixing component (22) connected to the fixing base plate (21), and a shoulder fixing component (23) symmetrically mounted on the fixing base plate (21); The foot and ankle fixation module (3) comprises a vertically arranged force transmission plate (31), and a foot and ankle fixation component (32) is symmetrically mounted on a side of the force transmission plate (31) close to the head and shoulder fixation module (2); The sole force application module (4) comprises a mounting seat (41) and a force application component (42) on the mounting seat (41) for driving the force transmission plate (31) to move horizontally. 2. According to claim 1, a simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints is characterized in that a slot (211) is provided on the fixed base plate (21), and the shoulder fixing components (23) are provided with buckles that can slide along the slot (211). 3. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 1, characterized in that the inner side surfaces of the head and neck fixation component (22) and the shoulder fixation component (23) are curved surfaces adapted to the contours of the head and shoulders respectively; The inner sides of the head and neck fixing component (22) and the shoulder fixing component (23) are both provided with sponge cushions. 4. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 1, characterized in that the ankle fixation assembly (32) includes a pedal (321) connected to the force transmission plate (31) and in direct contact with the sole of the foot and a shaping sponge (322) standing on both sides of the pedal (321), and a strap (323) for fixing the ankle is connected between the shaping sponges (322). 5. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 1, characterized in that the force transmission plate (31) includes a fixed vertical plate (311) and a movable vertical plate (312) slidably arranged at both ends of the fixed vertical plate (311). 6. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 5, characterized in that the ankle fixation components (32) are all arranged on the movable vertical plate (312), and the back of the ankle fixation components (32) are fixedly connected with a rotating shaft (324) passing through the movable vertical plate (312), and the part of the rotating shaft (324) extending out of the movable vertical plate (312) is connected with a locking component (325). 7. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 6, characterized in that the movable vertical plate (312) is provided with an angle scale line (313) corresponding to the rotation of the rotating shaft (321). 8. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 1, characterized in that the force-applying component (42) is a nylon cylinder, which includes a fixed portion (421) mounted on a mounting seat (41) and a telescopic portion (422) connected to a side of the force transmission plate (31) facing away from the head-shoulder fixation module (2). 9. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 8, characterized in that the force-applying components (42) are arranged at equal intervals, and the force-applying components (42) are all connected to a pressurizing component (43) through a catheter. 10. A simulated weight-bearing device for assisting magnetic resonance imaging of lower limb joints according to claim 9, characterized in that the pressurizing components (43) are all connected to the pressure control components (44).