A kind of patrol instrument shielding device for radiation protection detection in nuclear magnetic machine room

Abstract

The present application relates to a kind of for the radiation protection detection in nuclear magnetic machine room, including: shielding sleeve box, by diamagnetic material is made, for shielding external static magnetic field, its internal cavity shape is adapted according to the shape of the used patrol instrument;Ray detection mesh, set up on shielding sleeve box corresponding to the position of patrol instrument probe, by diamagnetic material is made, allow X or gamma ray to penetrate;Instrument data reading mesh, set up on shielding sleeve box corresponding to the position of patrol instrument display screen, by diamagnetic material is made, allow detection personnel to read data directly visually;The import and export of instrument that can be closed, be set on shielding sleeve box, and be equipped with the sealing cover made of diamagnetic material, for the input and output of patrol instrument, the sealing cover is in closed state when detecting.The present application solves the phenomenon that the radiation diagnosis and treatment machine room adjacent place is the radiation protection detection difficult to implement for nuclear magnetic resonance machine room.

Description

Technical Field

[0001] This invention relates to the field of radiation protection and radiation health technology, specifically to a shielding device for a survey instrument used in radiation protection detection in a nuclear magnetic resonance (NMR) room. Background Technology

[0002] In recent years, with the rapid development of my country's medical and health undertakings and the continuous growth of social demand, large tertiary-level hospitals have been shouldering increasingly heavy medical, teaching, scientific research, and public health tasks. To meet this challenge, many large tertiary-level hospitals have achieved leapfrog development by introducing cutting-edge equipment, expanding specialized departments, and optimizing service processes. However, this rapid development has inevitably brought about a serious practical problem—the extreme shortage of physical space in hospitals and the serious lag in the growth of their land area.

[0003] The hospital's original architectural planning and layout can no longer meet the ever-increasing demand for large-scale medical equipment in modern precision medicine. Especially in the fields of imaging diagnosis and radiotherapy, equipment such as computed tomography (CT), digital subtraction angiography (DSA), radiotherapy accelerators, and magnetic resonance imaging (MRI) have become indispensable core equipment in clinical practice. These devices are not only large in size, but their machine rooms also require thick protective walls, independent power supply and cooling systems, and extremely stringent technical requirements for the installation environment, resulting in extremely high space costs per unit.

[0004] To maximize the use of limited space, optimize treatment processes, achieve resource sharing, and reduce construction costs, hospitals often have to adopt a "compact" layout strategy when planning and renovating their facilities. Therefore, placing MRI rooms adjacent to or in the same area as other radiological diagnostic and treatment rooms (such as CT, DR, DSA, and even radiotherapy rooms) has become a common and unavoidable choice for many large hospitals due to practical constraints.

[0005] As is well known, while radiological diagnostic and treatment equipment provides convenience for human diagnosis and treatment, it also poses certain external radiation hazards from X-rays or gamma rays. To protect the occupational health of workers and minimize or eliminate potential radiation risks to the public, my country's "Regulations on the Management of Radiological Diagnosis and Treatment" requires that medical institutions regularly conduct radiation protection tests on radiological diagnostic and treatment workplaces, radioactive isotope storage sites, and protective facilities to ensure that radiation levels meet relevant regulations or standards. Furthermore, my country's occupational health standards "Radiation Protection Requirements for Radiological Diagnosis" (GBZ130-2020), "Radiation Protection Requirements for Radiotherapy" (GBZ121-2020), and "Radiation Protection Requirements for Nuclear Medicine" (GBZ120-2020) all stipulate that radiological diagnostic and treatment equipment operating rooms or sites should be regularly inspected and tested during use, with a testing cycle of one year.

[0006] Magnetic resonance imaging (MRI) rooms have extremely strict safety management regulations due to the extremely strong static magnetic field on which the equipment operates. Among them, "any ferromagnetic metal objects are strictly prohibited from entering" is a bottom line that must be strictly adhered to, because once a metal object is drawn into the magnetic field, it will become a high-speed "projectile" that poses a fatal threat to patients, medical staff, and the equipment itself.

[0007] However, when conducting radiation protection testing in radiological diagnostic and treatment facilities (such as CT, DSA, and X-ray rooms), the national standards (such as GBZ 130-2020) have clear requirements for the standardization of testing equipment. Key testing instruments, such as ionization chambers used to measure radiation dose and multichannel gamma spectrometers used to evaluate shielding effectiveness, unavoidably contain metallic materials in their core structures or critical components.

[0008] This irreconcilable contradiction leads to a real dilemma: when radiology and MRI rooms are located adjacent to each other, the strong peripheral magnetic field extends to the entrance or surrounding area of ​​the radiology room. Personnel carrying essential testing equipment containing metal face significant safety risks; however, removing or replacing the metal components with non-magnetic alternatives is either impossible or results in calibrated equipment, inaccurate results, and thus invalid test results, violating testing regulations. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a shielding device for a survey instrument used in radiation protection detection within a nuclear magnetic resonance (NMR) room, aiming to partially solve the problems of existing technologies.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a shielding device for a survey instrument used in radiation protection detection within a nuclear magnetic resonance (NMR) room, comprising: The shielding enclosure, made of antimagnetic material, is used to shield external static magnetic fields. The shape of its internal cavity is adapted to the shape of the survey instrument used. The X-ray inspection mesh, located on the shielding housing corresponding to the position of the survey instrument probe, is made of antimagnetic material, allowing X-rays or gamma rays to pass through; The instrument data reading mesh is located on the shielding box at the position corresponding to the display screen of the survey instrument. It is made of antimagnetic material and allows the testing personnel to read the data directly by visual inspection. The instrument inlet and outlet can be sealed and is located on the shielded box. It is equipped with a sealing cover made of antimagnetic material for placing and taking out the instrument. The sealing cover is in a sealed state during testing.

[0011] As a preferred technical solution, the antimagnetic material is a copper-zinc alloy, specifically a copper-zinc alloy with a zinc content of 15%-40% and a relative permeability of less than 1.

[0012] As a preferred technical solution, the aperture of the X-ray inspection mesh and the instrument data reading mesh is no more than 2 mm, and a honeycomb or array layout is adopted to ensure X-ray transmission and visual recognition while forming an effective magnetic circuit shield.

[0013] As a preferred technical solution, the sealing cover of the sealable instrument inlet and outlet is connected to the shielding box body through a hinge made of non-ferromagnetic material, and is equipped with a mechanical locking mechanism; the sealing cover and the hinge and mechanical locking mechanism connected thereto are made of copper-zinc alloy or non-magnetic plastic.

[0014] As a preferred technical solution, the size of the shielding box is the same as the dimensions of the survey instrument, and the shielding box wraps around the survey instrument.

[0015] As a preferred technical solution, a movable base is installed at the bottom of the shielding box. The movable base includes a flat plate made of non-magnetic material and casters. The wheel body and axle of the casters are made of engineering plastic or copper alloy.

[0016] As a preferred technical solution, the flat plate is equipped with a rotating device that can drive the shielding box to rotate 360°.

[0017] The power output component is a dual-axis synchronous rotary motor; the transmission and connection components include a rotating shaft assembly, which is a solid shaft made of copper alloy. One end is connected to the motor output shaft, and the other end is fixed to the housing of the shielded box via a coupling with a shaft connection structure; the support and positioning components include double-sided bracket bearing seats, including deep groove ball bearings mounted on the two side columns. The rotating shaft passes through the inner ring of the deep groove ball bearings to support the weight of the rotating shaft and the housing.

[0018] As a preferred technical solution, a remote data reading system is also included. This system includes a miniature industrial camera placed inside a shielded enclosure and aligned with the instrument data reading mesh, as well as a wired or wireless transmission module that transmits video signals to an external mobile display device. The camera and transmission module are powered by an external power source through a shielded cable passing through the shielded enclosure.

[0019] As a preferred technical solution, the side wall or bottom of the shielding box has an array of heat dissipation holes with a diameter of less than 1 mm, and is covered with an antimagnetic metal mesh.

[0020] Compared with existing technologies, the technical solution of this application has the following beneficial effects: This invention solves the problem of difficulty in implementing radiation protection testing when the radiology diagnostic room is adjacent to the MRI room. Through this design, ionizing radiation survey instruments can enter the MRI room for testing without causing safety issues. It meets the requirements of radiation protection testing standards and specifications while eliminating potential safety hazards. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a survey instrument shielding device for radiation protection detection in a nuclear magnetic resonance (NMR) room, as proposed in this invention. Figure 2 This is a schematic diagram of the shielding sleeve structure proposed in this invention; Figure 3 This is a schematic diagram of the bottom structure of the shielding sleeve proposed in this invention.

[0022] Explanation of reference numerals in the attached drawings: Shielding box 1; X-ray inspection mesh 2; Instrument data reading mesh 3; Sealing cover 4; Locking structure 41; Heat dissipation hole array 5; Movable base 6; Flat plate 61; Caster wheel 62; Motor 7; Column 8; Rotating shaft 9; Bushing 10; L-shaped bracket 11; Gasket 12. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-3 The present invention proposes a shielding device for a survey instrument used in radiation protection detection within a nuclear magnetic resonance (NMR) room, comprising: Shielding box 1, made of antimagnetic material, is used to shield external static magnetic fields. The shape of its internal cavity is adapted to the shape of the survey instrument used. The X-ray inspection mesh 2 is opened on the shielding box 1 at the position corresponding to the probe of the survey instrument. It is made of antimagnetic material and allows X or γ rays to pass through. The instrument data reading mesh 3 is located on the shielding box 1 at the position corresponding to the display screen of the survey instrument. It is made of antimagnetic material and allows the testing personnel to read the data directly by visual inspection. The sealable instrument inlet and outlet are located on the shielded box 1 and equipped with a sealing cover 4 made of antimagnetic material for placing and removing the instrument. During testing, the sealing cover 4 is in a sealed state.

[0025] Preferably, the antimagnetic material is a copper-zinc alloy, specifically a copper-zinc alloy with a zinc content of 15%-40% and a relative permeability of less than 1. This provides shielding against magnetic fields.

[0026] Preferably, the aperture of the X-ray inspection mesh 2 and the instrument data reading mesh 3 is no larger than 2 mm, and they adopt a honeycomb or array layout to ensure X-ray transmission and visual visibility while forming an effective magnetic circuit shield.

[0027] Preferably, the sealing cover 4 of the sealable instrument inlet / outlet is connected to the shielding housing 1 body via a hinge made of non-ferromagnetic material and is equipped with a mechanical locking structure 41. The specific structural design is not shown in the figure, but those skilled in the art should understand that the mechanical locking structure 41 can be a snap-fit ​​structure, a knob-type pressing structure, or a threaded fastening structure, all of which can achieve locking and fixation. Preferably, the sealing cover 4, the hinge connected to it, and the mechanical locking structure 41 are made of copper-zinc alloy or non-magnetic plastic. Preferably, the sealing cover 4 can also be equipped with a handle for easy opening and closing, and a sealing rubber ring is also provided around the circumference of the sealing cover 4.

[0028] Preferably, an instrument fixing inner support can also be provided. The inner support is made of elastic non-magnetic material and is fixed to the bottom of the shielding box 1. It is used to adapt to and clamp different models of survey instruments, preventing them from moving or colliding during handling and testing. The fixing inner support can be designed with multiple non-magnetic plastic protrusions on the bottom to engage the survey instruments and fix them in place.

[0029] Preferably, the system also includes a remote data reading system, comprising a miniature industrial camera housed within a shielded enclosure 1 and aligned with the instrument data reading mesh 3, and a wired or wireless transmission module for transmitting video signals to an external mobile display device. The camera and transmission module are powered by an external power source via a shielded cable passing through the shielded enclosure 1. Alternatively, a special built-in battery can be used. The casing of this battery can be aluminum-plastic film (common in lithium polymer batteries), aluminum alloy, or plastic. Its internal electrodes, current collectors, etc., are all made of non-ferromagnetic materials such as lithium, carbon, copper, and aluminum. Before being put into use, the battery must undergo magnetic testing in a strong magnetic field environment to ensure it is not attracted by magnetic fields.

[0030] Preferably, the side wall or bottom of the shielding box 1 has a heat dissipation hole array 5, the hole diameter is less than 1 mm, and it is covered with an antimagnetic metal mesh.

[0031] Preferably, a movable base 6 is installed at the bottom of the shielding housing 1. The movable base 6 includes a flat plate 61 made of non-magnetic material and casters 62. The wheel body and axle of the casters 62 are made of engineering plastic or copper alloy. This facilitates the movement of the device.

[0032] Preferably, the plate 61 is equipped with a rotating device that can be connected to the shielding box body. After connection, the shielding box body can be rotated by rotating the rotating device, allowing the detection hole to be aligned with the top, side, or bottom. This enables detection from the top, side, and bottom. Preferably, the plate 61 is provided with a cutout, allowing detection of the bottom when the shielding box body is rotated to face the bottom.

[0033] Preferably, the rotating device includes: Power output component: The power output component is a dual-axis synchronous rotary motor 7, which can be a DC geared motor 7. It provides the power for tilting, and the dual-axis design can synchronously drive the transmission mechanisms on both sides to ensure the stability of the box when tilting (avoiding tilting caused by single-sided drive).

[0034] Transmission and connection components: including the rotating shaft 9 assembly, which can be a solid copper alloy shaft with one end connected to the output shaft of the motor 7, and the other end fixed to the housing via a coupling in a "shaft connection structure". In this way, the power of the motor 7 is transmitted to the housing, making it the direct force-bearing component that drives the housing to rotate.

[0035] Support and positioning components: including double-sided bracket bearing housings, including deep groove ball bearings mounted on the two side columns 8, with the rotating shaft 9 passing through the inner ring of the bearings. These components support the weight of the rotating shaft 9 and the housing, reducing friction during tilting and ensuring smooth 360° continuous rotation.

[0036] Control components: The control circuit board includes integrated modules: a motor 7 driver chip, a microcontroller, and a power management module. It receives remote control / button signals and controls the forward, reverse, start / stop, and speed of motor 7. It also includes an encoder for "fixed-point rotation," allowing it to stop at positions such as 90° / 180°. A power supply module is also included to provide a stable power supply to motor 7 and the control circuit.

[0037] Preferably, the "shaft-connected structure" of the housing is a transition component used to connect the rotating shaft 9 and the housing. Its core function is to transmit the flipping torque and securely fix the housing, while also adapting to the installation requirements of dual-side drive. The specific structure includes the following components symmetrically distributed on both sides of the housing: The single-sided structure comprises three core parts: One type is the bushing 10 assembly, a cylindrical sleeve with an inner diameter matching the diameter of the rotating shaft 9. For example, if the rotating shaft 9 has a diameter of Φ12mm, the inner diameter of the bushing 10 is 12.1mm, with a small gap reserved for easy assembly. It can be made of hard ABS engineering plastic. The bushing 10 has a set screw hole and a locking knob on its side wall (the knob is screwed in to tighten the rotating shaft 9). Some designs will add knurled / rubber anti-slip pads to the inner wall of the bushing 10 to prevent slippage when flipping.

[0038] Secondly, there is a box body fixing component, an "L-shaped" bracket 11 that is perpendicularly connected to the bushing 10 (fitting against the side wall of the box body); the fixing component can be integrally injection molded with the side wall of the box body; or 2-4 screw holes can be pre-drilled on the surface of the fixing component, and it can be locked and fixed to the side wall of the box body by self-tapping screws.

[0039] Thirdly, there is a cushioning pad 12, which can be made of soft silicone with a thickness of 2-3mm; it is attached to the mating surface between the fixing base and the box body; it cushions the vibration during flipping and prevents the side wall of the box body from being scratched.

[0040] The final assembly form is that the "shaft connection structure" on both sides will be respectively fitted onto the left and right rotating shafts 9. After being fixed by the locking knob, the box is horizontally suspended between the two rotating shafts 9. At this time, when the rotating shafts 9 rotate, they will directly drive the box to rotate synchronously through the bushing 10 + fixing parts, achieving a smooth 360° rotation.

[0041] Preferably, not shown in the figure, the shielding box 1 can also adopt a modular design, consisting of at least two parts connected by non-magnetic quick-release buckles or non-magnetic bolts, to facilitate the adaptation of different sizes of monitoring instruments or for internal maintenance and cleaning. Here, the box can be designed as two spliced ​​parts; after the monitoring instrument is placed, it is fixed by quick-release buckles. The specific structure can be described in words by those skilled in the art, and is not specifically limited in the figure here.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shielding device for a survey instrument used in radiation protection detection within a nuclear magnetic resonance (NMR) room, characterized in that, include: The shielding enclosure, made of antimagnetic material, is used to shield external static magnetic fields. The shape of its internal cavity is adapted to the shape of the survey instrument used. The X-ray inspection mesh, which is opened on the shielding box at the position corresponding to the probe of the survey instrument, is made of antimagnetic material and allows X-rays or gamma rays to pass through. The instrument data reading mesh is located on the shielding box at the position corresponding to the display screen of the survey instrument. It is made of antimagnetic material and allows the testing personnel to directly read the data visually. The instrument inlet and outlet are sealed on the shielded box and equipped with a sealing cover made of antimagnetic material for placing and removing the instrument. The sealing cover is in a sealed state during testing.

2. The survey instrument shielding device according to claim 1, characterized in that, The antimagnetic material is a copper-zinc alloy, specifically a copper-zinc alloy with a zinc content of 15%-40% and a relative permeability of less than 1.

3. The survey instrument shielding device according to claim 1, characterized in that, The aperture of the X-ray detection mesh and the instrument data reading mesh is no larger than 2 mm, and they adopt a honeycomb or array layout to ensure X-ray transmission and visual visibility while forming an effective magnetic circuit shield.

4. The survey instrument shielding device according to claim 1, characterized in that, The sealing cover of the sealable instrument inlet and outlet is connected to the shielding box body by a hinge made of non-ferromagnetic material and is equipped with a mechanical locking mechanism; the sealing cover and the hinge and mechanical locking mechanism connected thereto are made of copper-zinc alloy or non-magnetic plastic.

5. The survey instrument shielding device according to claim 1, characterized in that, The size of the shielding box is the same as the dimensions of the survey instrument, and the shielding box covers the survey instrument from all sides.

6. The survey instrument shielding device according to claim 5, characterized in that, The bottom of the shielding box is equipped with a movable base, which includes a flat plate made of non-magnetic material and casters. The casters' wheel bodies and axles are made of engineering plastics or copper alloys.

7. The survey instrument shielding device according to claim 6, characterized in that, The plate is equipped with a rotating device that can drive the shielding box to rotate 360°.

8. The survey instrument shielding device according to claim 6, characterized in that, The rotating device includes: a power output component, a transmission and connection component, and a support and positioning component; the power output component is a dual-axis synchronous rotary motor; the transmission and connection component includes a rotating shaft assembly, which is a solid shaft made of copper alloy, one end of which is connected to the motor output shaft, and the other end is fixed to the housing body of the shielding box via a coupling; the support and positioning component includes double-sided bracket bearing seats, including deep groove ball bearings mounted on the two side columns, and the rotating shaft passes through the inner ring of the deep groove ball bearing to support the weight of the rotating shaft and the housing body.

9. The survey instrument shielding device according to claim 1, characterized in that, It also includes a remote data reading system, which includes a miniature industrial camera placed inside a shielded enclosure and aligned with the instrument data reading mesh, and a wired or wireless transmission module that transmits video signals to an external mobile display device. The camera and transmission module are powered by an external power source through shielded cables passing through the shielded enclosure.

10. The survey instrument shielding device according to claim 1, characterized in that, The shielding box has an array of heat dissipation holes on its side wall or bottom. The holes have a diameter of less than 1 mm and are covered with an antimagnetic metal mesh.

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