Magnetic torque detection mechanism

Abstract

The utility model belongs to the technical field of magnetic resonance examination, and discloses a magnetic torque detection mechanism which comprises a rotating assembly and a moving assembly, the rotating assembly comprises a base, a limiting ring, a rotating rod and a wire spool, and the moving assembly comprises a base plate, a lead screw, a sliding plate, an electronic push-pull meter and a driving device. The device is mainly used for determining the torque generated by a medical instrument under magnetic resonance examination or in a magnetic resonance environment due to the action of a magnetic field, and derivation is carried out through a data substitution formula, so that whether the object generates the magnetic torque action under the magnetic field or not and whether the object has a torsion risk or not are judged.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic resonance inspection, and more specifically relates to a magnetic torque detection mechanism. Background Art

[0002] Magnetic resonance refers to the phenomenon of spin magnetic resonance. It has a broad meaning, including nuclear magnetic resonance, electron paramagnetic resonance or electron spin resonance. Nuclear magnetic resonance imaging, also known as spin imaging, also known as magnetic resonance imaging, uses the principle of nuclear magnetic resonance. According to the different attenuation of the released energy in different structural environments inside the material, the electromagnetic waves emitted by the external gradient magnetic field can be detected to know the position and type of the atomic nuclei that constitute the object, and the internal structural image of the object can be drawn based on this.

[0003] As we all know, once the magnetic resonance is installed, it has a huge magnetic field, which has a strong effect on magnetic metal objects entering the magnet, mainly manifested as: magneto-heating effect, displacement force and torsional force. At present, there are corresponding methods for measuring magneto-heating effect and displacement force, but there is no corresponding measurement method for magneto-torsional force. Based on this, it is necessary to develop a magneto-torsional force detection device for magnetic resonance to predict the degree of danger of metal implants entering the magnet, which has very important practical significance for the safety of magnetic resonance examination of patients with metal implants in actual clinical practice. Summary of the invention

[0004] Technical issues

[0005] The purpose of the utility model is to provide a magneto-torque detection mechanism to solve the problems raised in the above background technology.

[0006] Technical Solution

[0007] A magneto-torque detection mechanism, characterized in that it comprises a rotating component and a moving component;

[0008] The rotating assembly includes a base, a limiting ring, a rotating rod, and a winding drum;

[0009] The limiting ring is fixedly arranged at the center of the base, a rotating rod is vertically arranged inside the limiting ring, a sensor is arranged inside the rotating rod, and the sensor detects the deflection angle of the rotating rod;

[0010] The top end of the rotating rod is fixedly connected with a winding drum, a traction line is wound inside the winding drum, and the traction line connects the rotating component and the moving component;

[0011] The moving assembly includes a base plate, a lead screw, a slide plate, an electronic push-pull meter, and a driving device;

[0012] The screw is fixedly connected to the base plate through a pad and a bearing support, the pad is arranged on the base plate, the bearing support is arranged on the pad, and the screw is fixedly installed on the bearing support;

[0013] A driving device is provided at one end of the screw rod;

[0014] Guide rods are arranged on the left and right sides of the screw rod, the guide rods are fixedly connected to the pads through T-blocks, and sliders are connected to the outer walls of the screw rod and the guide rods;

[0015] The top of the sliding block is fixedly connected with a sliding plate, the top of the sliding plate is connected with an electronic push-pull meter, and the electronic push-pull meter is connected to the traction line.

[0016] Preferably, a support plate is provided on the upper side of the base, and a plurality of connecting columns distributed in an array are fixedly connected between the base and the support plate.

[0017] Preferably, a through hole is provided at the center of the support plate, and bearings matching the rotating rod are fixedly installed in the through hole and the limiting ring.

[0018] Preferably, a plurality of mounting holes for fixing the metal block are provided on the top of the winding drum.

[0019] Preferably, the guide rod can rotate in the T-block. When the driving device drives the lead screw to rotate, the slider drives the slide plate to move along the thread, thereby driving the guide rod to rotate. The thread on the guide rod can reduce the friction between the slider and the guide rod. The guide rod can support the slide plate to keep it stable when moving.

[0020] Preferably, the sensor is in communication with a driving device.

[0021] Preferably, the calculation method is based on the calculation formula in ASTM F2213-17 standard, and the calculation formula is as follows:

[0022] τ magnetic =r×(FF f )

[0023] in:

[0024] τ magnetic = Maximum magnetic induction torque;

[0025] r = radius of the test fixture pulley;

[0026] F = maximum measured force of the equipment;

[0027] F f = Friction of the rotating platform without product loading.

[0028] Preferably, the driving device controls the screw rod to rotate, thereby controlling the slide plate to perform uniform linear motion.

[0029] Preferably, the traction line is in a vertically stretched state to ensure that the left and right pulling forces of the electronic push-pull meter are in the same straight line.

[0030] Beneficial Effects

[0031] Compared with the prior art, the utility model has the following features and improvements:

[0032] 1. When the metal block implant enters the magnetic field, the long axis of the magnetic resonance detection device will be aligned along the direction of the magnetic field, thus generating a deflection force, which we call torsion. The torque generated is called torque. If the maximum torque is less than the product of the maximum size of the metal block implant and its gravity, then the magneto-torque is less than the maximum gravitational torque generated by gravity. Here, the maximum radius of the gravitational torque is taken as the maximum size, that is, L = r*f, r is the maximum size, and f is the gravity of the object. In this case, we can assume that this object will not generate magneto-torque in this magnetic field, and there is no risk of twisting, that is, it is considered safe.

[0033] 2. The device is mainly used to determine the torque generated by the magnetic field on medical devices undergoing MRI examinations or in MRI environments. By substituting data into the formula for deduction, it is possible to determine whether the object produces a magneto-torque effect under this magnetic field and whether there is a risk of twisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the shaft side structure of the utility model;

[0035] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0036] Figure 3 This is a front view structural schematic diagram of the utility model;

[0037] Figure 4 It is a schematic diagram of the top view structure of the utility model;

[0038] Figure 5 It is a right side structural schematic diagram of the utility model.

[0039] Explanation of the numbers in the figure: 1. Base; 2. Base plate; 3. Limiting ring; 4. Rotating rod; 5. Winding reel; 6. Pull line; 7. Metal block; 8. Pad; 9. Bearing support; 10. Screw rod; 11. Driving device; 12. Slider; 13. Electronic push-pull meter; 14. Support plate; 15. Connecting column; 16. Through hole; 17. Bearing; 18. Mounting hole; 19. T-block; 20. Guide rod; 21. Slide plate. DETAILED DESCRIPTION

[0040] The detection device for magnetic resonance examination in this embodiment is as follows Figure 1-5 As shown, it includes a base 1 and a base plate 2, the base 1 is provided with a rotating component, and the base plate 2 is provided with a moving component;

[0041] The rotating assembly includes a limit ring 3 fixedly connected to the center of the base 1, a rotating rod 4 is vertically arranged in the limit ring 3, a sensor is arranged in the rotating rod 4, a winding drum 5 is fixedly connected to the top of the rotating rod 4, and a traction line 6 is wound in the winding drum 5, a metal block 7 is arranged on the top of the winding drum 5, and a plurality of mounting holes 18 for fixing the metal block 7 are opened on the top of the winding drum 5, a support plate 14 is arranged on the upper side of the base 1, a plurality of connecting columns 15 in an annular array and distributed at equal intervals are fixedly connected between the base 1 and the support plate 14, a through hole 16 is opened in the center of the support plate 14, and a bearing 17 adapted to the rotating rod 4 is fixedly installed in the through hole 16 and the limit ring 3;

[0042] The rotating component in the device is placed in the magnetic resonance detection device. With the cooperation of the moving components, the electronic push-pull meter 13 drives the winding disk 5 to rotate through the traction wire 6, and further drives the metal block 7 fixedly connected to the top of the winding disk 5 to rotate. The bearing 17 is made of ceramic material and the traction wire 6 is made of nylon material.

[0043] The moving component includes two pads 8 fixedly connected to the base plate 2, a bearing support 9 fixedly installed at the center of the pad 8, a screw 10 fixedly installed on the bearing support 9, a driving device 11 for providing rotational power to the screw 10 is provided at one end of the screw 10, a slider 12 is threadedly connected to the outer wall of the screw 10, a slide plate 21 is fixedly connected to the top of the slider 12, an electronic push-pull meter 13 is fixedly connected to the top of the slide plate 21, and the electronic push-pull meter 13 is fixedly connected to the traction line 6, and T-shaped blocks 19 fixedly connected to the pad 8 are provided on both sides of the bearing support 9, and guide rods 20 passing through the slider 12 are fixedly installed on the T-shaped blocks 19.

[0044] The output shaft of the driving device 11 drives the screw rod 10 to rotate through the coupling. The screw rod 10 drives the slide plate 21 fixedly connected to its top through the slider 12, and the electronic push-pull meter 13 fixedly connected to the top of the slider 21 to move. During the movement, the electronic push-pull meter 13 is always in a uniform motion state. A T-shaped block 19 and a guide rod 20 are provided to prevent the screw rod 10 from rotating when driving the slider 12 to move.

[0045] When the metal block 7 implant enters the magnetic field, the long axis of the magnetic resonance detection device will be aligned along the direction of the magnetic field, thereby generating a deflection force, which we call torsion, and the torque generated is called torque. If the maximum torque is less than the product of the maximum size and weight of the metal block 7 implant, then the magneto-torque is less than the maximum gravitational torque generated by gravity. Here, the maximum radius of the gravitational torque is taken as the maximum size, that is, L=r*f, r is the maximum size, and f is the gravity of the object. In this case, we can assume that this object will not generate magneto-torque under this magnetic field, and there is no risk of twisting, that is, it is considered safe. This device is mainly used to determine the torque generated by the magnetic field of medical devices undergoing magnetic resonance examinations or in a magnetic resonance environment. By substituting data into the formula for deduction, it is possible to determine whether this object generates magneto-torque under this magnetic field and whether there is a risk of twisting.

[0046] The specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A magneto-torque detection mechanism, characterized in that: It includes a rotating component and a moving component; The rotating assembly includes a base, a limiting ring, a rotating rod, and a winding drum; The limiting ring is fixedly arranged at the center of the base, a rotating rod is vertically arranged inside the limiting ring, a sensor is arranged inside the rotating rod, and the sensor detects the deflection angle of the rotating rod; The top end of the rotating rod is fixedly connected with a winding drum, a traction line is wound inside the winding drum, and the traction line connects the rotating component and the moving component; The moving assembly includes a base plate, a lead screw, a slide plate, an electronic push-pull meter, and a driving device; The screw is fixedly connected to the base plate through a pad and a bearing support, the pad is arranged on the base plate, the bearing support is arranged on the pad, and the screw is fixedly installed on the bearing support; A driving device is provided at one end of the screw rod; Guide rods are arranged on the left and right sides of the screw rod, the guide rods are fixedly connected to the pads through T-blocks, sliders are connected to the outer walls of the screw rod and the guide rod, and threads are arranged on the screw rod and the guide rod; The top of the sliding block is fixedly connected with a sliding plate, the top of the sliding plate is connected with an electronic push-pull meter, and the electronic push-pull meter is connected to the traction line.

2. A magneto-torque detection mechanism according to claim 1, characterized in that: A support plate is arranged on the upper side of the base, and a plurality of connecting columns distributed in an array are fixedly connected between the base and the support plate.

3. A magneto-torque detection mechanism according to claim 2, characterized in that: A through hole is provided at the center of the support plate, and bearings matching the rotating rod are fixedly installed in the through hole and the limiting ring.

4. The magneto-torque detection mechanism according to claim 1, characterized in that: The top of the winding drum is provided with a plurality of mounting holes for fixing the metal block.

5. The magneto-torque detection mechanism according to claim 1, characterized in that: The guide rod can rotate within the T-block.

6. The magneto-torque detection mechanism according to claim 1, characterized in that: The sensor is connected to the driving device.

7. The magneto-torque detection mechanism according to claim 1, characterized in that: The driving device controls the screw rod to rotate, thereby controlling the slide plate to perform uniform linear motion.

8. The magneto-torque detection mechanism according to claim 1, characterized in that: The traction line is in a vertical stretching state, ensuring that the left and right pulling forces of the electronic push-pull meter are in the same straight line.

Images