Constrictors and X-ray generating equipment
By using a lead screw connected to a reverse-threaded nut in the collimator to drive the baffle movement, and combining it with a guide structure and position detection components, the problems of cumbersome collimator structure and low baffle opening and closing accuracy are solved, achieving more precise X-ray irradiation control and health protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING WANDONG MEDICAL TECH CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-06-30
Smart Images
Figure CN224421027U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical diagnostic and treatment equipment technology, and in particular to a beam limiter and an X-ray generating device. Background Technology
[0002] A beam limiter, also known as a "beam blocker," "beam reducer," or "beam condenser," is used to limit the irradiation range of X-rays emitted from an X-ray emitter, ensuring that the X-rays only irradiate the parts of the body that need to be examined or the lesions, thus avoiding the harm caused by excess X-rays.
[0003] However, existing beam limiters typically use a drive assembly to drive gears, synchronous pulleys, etc., to make the two baffles move synchronously, thereby adjusting the blocking range of the two baffles on the opening and thus adjusting the X-ray irradiation range. This makes the beam limiter structure relatively cumbersome, and the multi-stage transmission reduces the accuracy of the baffle opening and closing, which can easily lead to excess X-rays still irradiating non-detection parts of the human body during the detection process. Utility Model Content
[0004] This application provides a beam limiter and an X-ray generating device, which aim to improve the opening and closing accuracy of the baffle, better control the irradiation range of X-rays, and reduce the radiation dose to non-detection areas.
[0005] To address the aforementioned technical problems, embodiments of this application provide a beam limiter, comprising:
[0006] The substrate has an opening;
[0007] A drive mechanism includes a transmission assembly and a drive component. The transmission assembly includes a lead screw and two nuts. The lead screw has a first threaded portion and a second threaded portion. The first threaded portion and the second threaded portion have opposite thread directions. The two nuts are respectively threadedly connected to the first threaded portion and the second threaded portion. The drive component is drivenly connected to the lead screw.
[0008] Two baffles, each connected to one of the two said wire nuts, are configured to change the opening area of the opening under the drive of the driving mechanism; and
[0009] A guide structure is disposed on the substrate and configured to restrict the baffle to slide relative to the substrate along the axial direction of the lead screw during the rotation of the lead screw.
[0010] In some embodiments, the guide structure includes:
[0011] A first guide rail is disposed on the substrate and extends along the axial direction of the lead screw; and
[0012] Two sliders are slidably connected to the first guide rail and respectively connected to the two wire nuts.
[0013] In some embodiments, the guide structure further includes:
[0014] The second guide rail is disposed on the substrate and is respectively disposed on the opposite sides of the opening with the first guide rail. The baffle is slidably engaged with the second guide rail.
[0015] In some embodiments, the second guide rail has a recessed guide groove on its surface facing the first guide rail, and the baffle has a protrusion extending away from the substrate at one end near the second guide rail. The protrusion has an insertion part on its surface facing the second guide rail, the insertion part extending into the guide groove and slidingly engaging with the guide groove.
[0016] In some embodiments, the baffle has a flange extending away from the substrate at one end near the first guide rail, and the flange is connected to the nut.
[0017] In some embodiments, the beam limiter further includes:
[0018] A position detection component is mounted on the substrate and used to detect the position of the baffle.
[0019] In some embodiments, the position detection element is a micro switch that is triggered to generate a position detection signal when the baffle fully opens the opening.
[0020] In some embodiments, the beam limiter further includes:
[0021] Two limiting members are both mounted on the substrate; and
[0022] Two bearings are respectively installed on the two limiting members and sleeved on both ends of the lead screw;
[0023] Both of the aforementioned nutlets are located between two limiting members.
[0024] In some embodiments, the driving component includes:
[0025] Electric motor; and
[0026] A flexible coupling connects the lead screw and the output shaft of the motor.
[0027] This application also provides an X-ray generating device, including:
[0028] X-ray generator; and
[0029] In the aforementioned beam limiter, the substrate is mounted on the X-ray emitter, and the opening is aligned with the emission port of the X-ray emitter.
[0030] In this embodiment, the beam limiter drives a lead screw to rotate via a drive assembly, which in turn drives two synchronous lead nuts to move, thereby moving two baffles to control the opening area. This simplifies the beam limiter's structure. Furthermore, the first and second threaded portions directly on the lead screw drive the two lead nuts to move, i.e., the baffles are driven by threaded transmission. This improves the opening and closing accuracy of the two baffles, thereby better controlling the X-ray irradiation range, reducing the radiation dose to non-detection areas, protecting the health of inspection personnel, and simultaneously increasing the radiation intensity within the detection area, improving imaging contrast and clarity. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is a schematic diagram of the structure of the beam limiter provided in the embodiments of this application;
[0033] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0034] Figure 3 for Figure 1 Enlarged view of point B in the middle.
[0035] Explanation of reference numerals in the attached figures:
[0036] 1000, constraint limiter; 100, base plate; 100a, opening; 200, drive mechanism; 210, transmission assembly; 211, lead screw; 2111, first threaded part; 2112, second threaded part; 212, nut; 220, drive assembly; 221, motor; 222, flexible coupling; 300, baffle; 310, protrusion; 320, insertion part; 330, flange; 400, guide structure; 410, first guide rail; 420, slider; 430, second guide rail; 430a, guide groove; 500, position detection component; 510, micro switch; 600, limiting component; 700, bearing. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0038] A beam limiter, also known as a "beam blocker," "beam reducer," or "beam condenser," is used to limit the irradiation range of X-rays emitted from an X-ray emitter, ensuring that the X-rays only irradiate the parts of the body that need to be examined or the lesions, thus avoiding the harm caused by excess X-rays.
[0039] However, existing beam limiters typically use a drive assembly to drive gears, synchronous pulleys, etc., to make the two baffles move synchronously, thereby adjusting the blocking range of the two baffles on the opening and thus adjusting the X-ray irradiation range. This makes the beam limiter structure relatively cumbersome, and the multi-stage transmission reduces the accuracy of the baffle opening and closing, which can easily lead to excess X-rays still irradiating non-detection parts of the human body during the detection process.
[0040] To resolve the above issues, please refer to [link / reference]. Figure 1 This application provides a collimator 1000 and an X-ray generating device. The X-ray generating device includes an X-ray generator and the collimator 1000. The X-ray generator can be enclosed or open, and no specific limitation is made here. Based on function, the X-ray generating device can be a diagnostic device such as a conventional X-ray machine, a mammography machine, or a gastrointestinal machine, or a therapeutic device such as a deep X-ray therapy machine, and no specific limitation is made here. Based on shape, the X-ray generating device can be vertical or horizontal, and no specific limitation is made here.
[0041] Specifically, an X-ray generator includes a high-voltage generator and an X-ray tube. The high-voltage electric field of the high-voltage generator accelerates electrons to obtain a high-speed electron stream. The high-speed electron stream strikes the target surface of the X-ray tube and is decelerated by the Coulomb field of the atomic nucleus. The energy is converted into X-rays (bremsstrahlung radiation) and thermal energy.
[0042] Please see Figure 1 The beam limiter 1000 includes a substrate 100, a drive mechanism 200, two baffles 300, and a guide structure 400. The substrate 100 has an opening 100a and is mounted on an X-ray emitter. Specifically, the substrate 100 is mounted on an X-ray tube, and the opening 100a is aligned with the outlet of the X-ray tube to achieve precise control of the X-ray irradiation range. The opening 100a can be circular or square, and no specific limitation is made here.
[0043] Please see Figure 1The drive mechanism 200 includes a transmission assembly 210 and a drive assembly 220. The transmission assembly 210 includes a lead screw 211 and two nuts 212. The lead screw 211 has a first threaded portion 2111 and a second threaded portion 2112, with the threads of the first threaded portion 2111 and the second threaded portion 2112 having opposite directions of rotation. The two nuts 212 are threadedly connected to the first threaded portion 2111 and the second threaded portion 2112, respectively. The drive assembly 220 is drively connected to the lead screw 211. It can be understood that the first threaded portion 2111 and the second threaded portion 2112 are arranged along the axial direction of the lead screw 211, and one of the first threaded portion 2111 and the other of the second threaded portion 2112 is a left-hand thread and the other is a right-hand thread. The drive assembly 220 can be a stepper motor 221, a servo motor 221, etc., and no specific limitation is made here.
[0044] Two baffles 300 are respectively connected to two wire nuts 212, so that the wire nuts 212 can drive the corresponding baffles 300 to move. The baffles 300 can be made of lead and its alloys, tungsten and its alloys, or bismuth and its alloys, as long as the material has high X-ray absorption capacity, structural stability, and safety; no specific limitation is made here. The two baffles 300 are configured to change the opening area of the opening 100a under the drive of the drive mechanism 200. The opening area of the opening 100a can be understood as the overlap area between the gap between the two baffles 300 and the opening 100a. The baffles 300 can be set on the side of the substrate 100 closer to the X-ray generator, or on the side of the substrate 100 away from the X-ray generator; no specific limitation is made here.
[0045] Please see Figure 1 A guide structure 400 is disposed on the substrate 100 and configured to restrict the baffle 300 to slide relative to the substrate 100 along the axial direction of the lead screw 211 during the rotation of the lead screw 211. In essence, the guide structure 400 is used to fix the movement trajectory of the baffle 300 and prevent the baffle 300 from rotating under the influence of the lead screw 211. The guide structure 400 can restrict the lead screw nut 212 to slide along the axial direction of the lead screw 211 by connecting with it, thereby restricting the baffle 300 to slide along the axial direction of the lead screw 211. Alternatively, the guide structure 400 can be directly connected to the baffle 300 to restrict the baffle 300 to slide along the axial direction of the lead screw 211; no specific limitation is made here. The guide structure 400 can be disposed on the side of the opening 100a closer to the substrate 100 or on the side of the opening 100a farther from the substrate 100; no specific limitation is made here.
[0046] Understandably, both the nut 212 and the baffle 300 will slide relative to the substrate 100 along the axial direction of the lead screw 211 under the constraint of the guide structure 400. The first threaded portion 2111 and the second threaded portion 2112 have opposite thread directions, so that when the lead screw 211 rotates, the two nuts 212 move closer or further away from each other relative to the substrate 100 along the axial direction of the lead screw 211. Thus, the two nuts 212 respectively drive the two baffles 300 to move closer or further away from each other relative to the substrate 100 along the axial direction of the lead screw 211. Therefore, by controlling the rotation direction of the lead screw 211, the opening area of the opening 100a can be changed by controlling the two baffles 300 to move closer or further away from each other.
[0047] The drive mechanism 200, baffle 300, and guide structure 400 can be located on the same side of the substrate 100 or on different sides of the substrate 100, without specific limitations. Preferably, the drive mechanism 200, baffle 300, and guide structure 400 are all located on the same side of the substrate 100. This avoids the need to open clearance holes on the substrate 100 for the guide structure 400 to pass through, thereby reducing the cost of the limiter 1000.
[0048] For ease of understanding, the first threaded portion 2111 is located to the right of the second threaded portion 2112, and the lead screw 211 rotates clockwise. The nut 212 connected to the first threaded portion 2111 moves to the right. When the drive assembly 220 drives the lead screw 211 to rotate clockwise, the nut 212 connected to the first threaded portion 2111 moves to the right relative to the substrate 100, and drives the corresponding baffle 300 to move to the right relative to the substrate 100. The nut 212 connected to the second threaded portion 2112 moves to the left relative to the substrate 100, and drives the corresponding baffle 300 to move to the left relative to the substrate 100, so that the two baffles 300 move away from each other to increase the opening area of the opening 100a.
[0049] When the drive assembly 220 drives the lead screw 211 to rotate counterclockwise, the nut 212 connected to the first threaded portion 2111 moves to the left relative to the substrate 100, and drives the corresponding baffle 300 to move to the left relative to the substrate 100. The nut 212 connected to the second threaded portion 2112 moves to the right relative to the substrate 100, and drives the corresponding baffle 300 to move to the right relative to the substrate 100, so that the two baffles 300 move toward each other to reduce the opening area of the opening 100a.
[0050] In this embodiment, the beam limiter 1000 drives the lead screw 211 to rotate via the drive assembly 220, thereby driving the two synchronous nuts 212 to move, which in turn moves the two baffles 300 to control the opening area of the opening 100a. This simplifies the structure of the beam limiter 1000. Furthermore, by directly providing a first threaded portion 2111 and a second threaded portion 2112 on the lead screw 211, the two nuts 212 are driven to move, i.e., the baffles 300 are driven by a threaded transmission. This improves the opening and closing accuracy of the baffles 300, thereby better controlling the size of the X-ray irradiation range, reducing the radiation dose to non-detection areas, protecting the health of the detection personnel, and simultaneously increasing the radiation intensity within the detection area, improving imaging contrast and clarity.
[0051] Please see Figure 1 as well as Figure 2 In some embodiments, the guide structure 400 includes a first guide rail 410 and two sliders 420. The first guide rail 410 is disposed on the substrate 100 and extends along the axial direction of the lead screw 211. The two sliders 420 are slidably connected to the first guide rail 410 and are respectively connected to two nuts 212. This arrangement, by connecting the sliders 420 to the nuts 212, better restricts the nuts 212 to slide along the axial direction of the lead screw 211. It is understood that the first guide rail 410 is disposed on the periphery of the lead screw 211. The first guide rail 410 can be disposed between the lead screw 211 and the substrate 100, or it can be disposed on the side of the lead screw 211 near or away from the opening 100a. Preferably, the first guide rail 410 is disposed between the lead screw 211 and the substrate 100, which fully utilizes the space between the substrate 100 and the lead screw 211 and facilitates the connection of the sliders 420 to the first guide rail 410 and the nuts 212.
[0052] The slider 420 and the nut 212 can be integrally formed or detachably connected; no specific limitation is made here.
[0053] Further, please refer to Figure 1 The guide structure 400 also includes a second guide rail 430, which is disposed on the substrate 100 and is respectively disposed on opposite sides of the opening 100a with the first guide rail 410. The baffle 300 is slidably engaged with the second guide rail 430. With this configuration, one end of the baffle 300 is restricted by the nut 212, the slider 420 and the first guide rail 410 to slide along the axial direction of the lead screw 211, and the other end of the baffle 300 is restricted by the second guide rail 430 to slide along the axial direction of the lead screw 211. This makes the baffle 300 more stable during sliding and prevents the baffle 300 from swinging in the direction of approaching or moving away from the substrate 100 during sliding.
[0054] In some embodiments, the substrate 100 is provided with a trapezoidal track extending along the axial direction of the lead screw 211 to form a second guide rail 430. The trapezoidal track is provided through the baffle 300 in the direction close to it, and the two opposing walls are provided close to each other in the direction close to the baffle 300. The baffle 300 is provided with a trapezoidal portion corresponding to the trapezoidal track. The trapezoidal portion is located inside the trapezoidal track. The baffle 300 is limited in the direction close to or away from the substrate 100 by the cooperation between the trapezoidal portion and the trapezoidal track.
[0055] Please see Figure 3 In some embodiments, the second guide rail 430 has a recessed guide groove 430a on its surface facing the first guide rail 410. The baffle 300 has a protrusion 310 extending away from the substrate 100 at one end near the second guide rail 430. An insertion portion 320 is provided on the surface of the protrusion 310 facing the second guide rail 430, extending into the guide groove 430a and slidingly engaging with it. This configuration effectively limits the baffle 300 in the direction of approaching or moving away from the substrate 100 by engaging the insertion portion 320 with the guide groove 430a. Simultaneously, the protrusion 310 reduces the gap between the baffle 300 and the substrate 100, allowing the baffle 300 to better block the opening 100a and reduce the amount of X-rays leaking out from the gap between the baffle 300 and the substrate 100. The plug portion 320 can be integrally formed with the protrusion 310, or the plug portion 320 can be detachably installed on the protrusion 310 by screws, without any specific limitation.
[0056] Please see Figure 2 In some embodiments, the end of the baffle 300 near the first guide rail 410 is provided with a flange portion 330 extending in a direction away from the substrate 100, and the flange portion 330 is connected to the nut 212. This configuration, by connecting the flange portion 330 to the nut 212, reduces the gap between the baffle 300 and the substrate 100, thereby allowing the baffle 300 to better block the opening 100a and reduce the amount of X-rays leaking out from the gap between the baffle 300 and the substrate 100.
[0057] The flange 330 and the nut 212 can be connected by welding or by threaded connection; no specific limitation is made here.
[0058] Please see Figure 1 In some embodiments, the beam limiter 1000 further includes a position detection element 500, which is mounted on the substrate 100 and used to detect the position of the baffle 300. This configuration allows the position of the baffle 300 to be detected by the position detection element 500, thereby better controlling the movement of the baffle 300 to a designated position and thus better adjusting the X-ray irradiation range.
[0059] The position detection element 500 can detect the position of the baffle 300 by infrared detection or by a Hall sensor in conjunction with a magnetic component; no specific limitation is made here. The position detection element 500 can be positioned on the side of the lead screw 211 that is axially close to or far from the drive assembly 220, or it can be positioned on the side of the opening 100a that is close to or far from the lead screw 211; no specific limitation is made here.
[0060] Specifically, please refer to Figure 2 The position detection element 500 is a micro switch 510. The position detection element 500 is triggered to generate a position detection signal when the baffle 300 is fully opened at the opening 100a. With this configuration, when the baffle 300 is fully opened at the opening 100a, the micro switch 510 is triggered to generate a position detection signal. The controller can be configured to receive the detection signal and control the drive assembly 220 to stop working based on the detection signal. This avoids the drive assembly 220 from continuously working when the baffle 300 is fully opened at the opening 100a, which would cause the two nuts 212 to disengage from the first threaded portion 2111 and the second threaded portion 2112.
[0061] The micro switch 510 can be triggered by the baffle 300, the slider 420, or the nut 212; no specific limitations are made here.
[0062] Please see Figure 1 as well as Figure 2 In some embodiments, the clamp limiter 1000 further includes two limiting members 600 and two bearings 700. The two limiting members 600 are both mounted on the base plate 100, and the two bearings 700 are respectively mounted on the two limiting members 600 and sleeved on both ends of the lead screw 211; wherein, the two lead nuts 212 are both located between the two limiting members 600.
[0063] With this configuration, two bearings 700 are sleeved at both ends of the lead screw 211 and cooperate with two limiting members 600 to limit the lead screw 211 without affecting its rotation. Both nuts 212 are located between the two limiting members 600, which can prevent the nuts 212 from detaching from the lead screw 211 when sliding along its axial direction.
[0064] Please see Figure 1In some embodiments, the drive assembly 220 includes a motor 221 and a flexible coupling 222, which connects the lead screw 211 and the output shaft of the motor 221. This configuration, where the output shaft of the motor 221 is connected to the lead screw 211 via the flexible coupling 222, effectively reduces additional stress on the output shaft and lead screw 211, preventing wear and tear. It also effectively prevents motor 221 from malfunctioning due to sudden overload, reducing maintenance costs. Furthermore, it reduces direct contact between the lead screw 211 and the output shaft of the motor 221, buffering vibration transmission and thus reducing noise.
[0065] In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0067] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0068] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0069] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A beam stop, characterized by, include: The substrate has an opening; A drive mechanism includes a transmission assembly and a drive component. The transmission assembly includes a lead screw and two nuts. The lead screw has a first threaded portion and a second threaded portion. The first threaded portion and the second threaded portion have opposite thread directions. The two nuts are respectively threadedly connected to the first threaded portion and the second threaded portion. The drive component is drivenly connected to the lead screw. Two baffles are respectively connected to the two said wire nuts, and the two said baffles are configured to change the opening area of the opening under the drive of the drive mechanism; as well as A guide structure is disposed on the substrate and configured to restrict the baffle to slide relative to the substrate along the axial direction of the lead screw during the rotation of the lead screw.
2. The beam stop of claim 1, wherein, The guiding structure includes: A first guide rail is disposed on the substrate and extends along the axial direction of the lead screw; and Two sliders are slidably connected to the first guide rail and respectively connected to the two wire nuts.
3. The beam stop of claim 2, wherein, The guiding structure also includes: The second guide rail is disposed on the substrate and is respectively disposed on the opposite sides of the opening with the first guide rail. The baffle is slidably engaged with the second guide rail.
4. The beam stop of claim 3, wherein, The second guide rail has a recessed guide groove on its surface facing the first guide rail. The baffle has a protrusion extending away from the substrate at one end near the second guide rail. The protrusion has an insertion part on its surface facing the second guide rail. The insertion part extends into the guide groove and slides with the guide groove.
5. The beam dump of claim 2, wherein, The baffle has a flange extending away from the substrate at one end near the first guide rail, and the flange is connected to the nut.
6. The beam dump of claim 2, wherein, Also includes: A position detection component is mounted on the substrate and used to detect the position of the baffle.
7. The beam stop of claim 6, wherein, The position detection device is a micro switch, which is triggered to generate a position detection signal when the baffle fully opens the opening.
8. The beam limiter according to any one of claims 1-7, characterized in that, Also includes: Both limiting members are mounted on the substrate; as well as Two bearings are respectively installed on the two limiting members and sleeved on both ends of the lead screw; Both of the aforementioned nutlets are located between two limiting members.
9. The beam limiter according to any one of claims 1-7, characterized in that, The driving component includes: Electric motor; and A flexible coupling connects the lead screw and the output shaft of the motor.
10. An X-ray generating device, characterized in that, include: X-ray generator; as well as The beam limiter as described in any one of claims 1-9, wherein the substrate is mounted on the X-ray emitter, and the opening is aligned with the emission port of the X-ray emitter.