Examination table

Abstract

The application relates to an examination bed, comprising a rotating base plate (1), a bed plate unit (5), a support (6), the bottom end of the support (6) being connected to the rotating base plate (1), the top end of the support (6) being connected to the bed plate unit (5), the first end of the rotating base plate (1) being provided with a rotating center (11), the rotating base plate (1) being configured to rotate around the rotating center, the second end of the rotating base plate (1) being provided with an electromagnet (2) for being attracted to or separated from an armature (3) at a set position.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a rotatable positioning examination bed for medical imaging examination and a control method thereof. Background Technology

[0002] Traditional examination tables rely on mechanical locking structures such as gear racks and pins. Frequent operation leads to irreversible wear on key components (such as latching springs and guide rail sliders)—the gap between the pins and positioning holes continuously increases, resulting in deterioration of positioning accuracy, causing image artifacts and increasing the risk of misdiagnosis. Furthermore, the mechanical locking process requires four steps: unlocking, pushing and rotating, visual alignment, and relocking. Each adjustment is time-consuming, and the discrete hole design prevents the continuous fine-tuning required in clinical practice, severely limiting diagnostic efficiency and accuracy.

[0003] Therefore, there is a need to provide an inspection bed that has a fast response speed, reliable locking, and adaptability to multi-angle positioning, in order to solve the inherent defects of mechanical locks. Utility Model Content

[0004] The purpose of this invention is to provide an examination bed that has a fast response speed, reliable locking, and is easy to use.

[0005] An examination bed of the present invention includes a rotating base plate (1), a bed board unit (5), and a support member (6). The bottom end of the support member (6) is connected to the rotating base plate (1), and the top end of the support member (6) is connected to the bed board unit (5). A rotation center (11) is provided at the first end of the rotating base plate (1), and the rotating base plate (1) is configured to rotate around the rotation center. An electromagnet (2) is provided at the second end of the rotating base plate (1) for engaging or disengaging with an armature (3) at a set position.

[0006] Optionally, the examination bed also includes a control unit for controlling the switching on and off of the current in the electromagnet (2).

[0007] Optionally, the electromagnet (2) and / or the armature (3) are provided with a first degree of freedom compensation mechanism that rotates around the Z-axis so that the attraction surfaces remain parallel at the moment of attraction; or the electromagnet (2) and / or the armature (3) are also provided with a second degree of freedom compensation mechanism that rotates around the X-axis to counteract the overturning moment caused by the lateral force.

[0008] Optionally, the armature (3) is arranged circumferentially along the outer side of the first end of the rotating base plate (1) to form multiple discrete positioning points, the number of positioning points being ≥8 and the angular interval being ≤45°.

[0009] Optionally, the armature (3) is made of soft magnetic alloy material, and its attraction surface is provided with an anti-wear coating with a coating thickness of 0.1-0.5mm.

[0010] Optionally, the armature (3) can be arranged above, below or to the side of the electromagnet (2); the switching on and off of the electromagnet (2) can enable the electromagnet and the armature (3) to attract or separate.

[0011] Optionally, a rotating caster (10) is provided at the bottom of the second end of the rotating base plate (1).

[0012] Optionally, the examination bed further includes an electromagnet bracket (12) disposed at the second end of the rotating base plate (1), wherein the electromagnet (2) is movably connected to the electromagnet bracket (12), and the electromagnet rotates relative to the X-axis of the electromagnet bracket.

[0013] Optionally, the control unit supports multi-mode triggering, including at least one of the following: a physical button; a voice control module that responds to specific frequency commands; and a light sensing module that identifies preset light signals.

[0014] Optionally, the examination bed also includes a position feedback module, which includes an angle encoder and indicator lights to display the locking angle position of the rotating base plate (1) in real time.

[0015] Optionally, the rated attraction force of the electromagnet (2) and the armature (3) can be adjusted in the range of 50N-500N, and the graded adjustment is achieved by the PWM voltage regulation circuit of the control unit.

[0016] Optionally, the second degree of freedom compensation mechanism rotating about the X-axis includes a cross-roller bearing with radial stiffness >100 N / μm and axial stiffness >50 N / μm.

[0017] The advantages of this invention are as follows: the fixed position of the examination bed can be flexibly adjusted; when the electromagnet is engaged, the electromagnet and the armature are completely aligned without any gap, resulting in higher positioning accuracy and stable engagement; the electromagnet engagement and positioning structure is simple and easy to manufacture, and can be applied to any situation on the examination bed where the transmission of tension needs to be controlled; the electromagnet and armature engagement mechanism can transmit tension, and the transmitted tension is adjustable; the electromagnet engagement can be achieved through control methods such as switches, buttons, sound, or light, making operation more convenient and intelligent. Attached Figure Description

[0018] Figure 1 A schematic diagram of the combined examination bed provided in the embodiments of this application;

[0019] Figure 2 for Figure 1 A partially enlarged schematic diagram of the examination bed;

[0020] Figure 3 A schematic diagram of the combination of the rotating base plate, electromagnet, and armature of the examination bed provided in the embodiments of this application;

[0021] Figure 4 for Figure 3 A partially enlarged schematic diagram of the structure within the box;

[0022] Figure 5 This is a schematic diagram of the electromagnet and armature adsorption provided in an embodiment of this application. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "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 based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that if 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. If 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. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0029] Figure 1-5 This is a schematic diagram of the structure of an examination bed according to some embodiments of this specification, the examination bed being used to support the object being scanned (e.g., a patient).

[0030] An examination bed according to some embodiments of this application includes a rotating base plate 1, a bed board unit 5, and a support member 6. The bottom end of the support member 6 is connected to the rotating base plate 1, and the top end of the support member 6 is connected to the bed board unit 5. A rotation center 11 is provided at the first end of the rotating base plate 1, and the rotating base plate 1 is configured to rotate around the rotation center. An electromagnet 2 is provided at the second end of the rotating base plate 1 for engaging or disengaging with an armature 3 at a set position.

[0031] The core structure of this examination bed consists of a three-tiered load-bearing system comprised of a rotating base plate, a bed board unit, and supporting components. The rotating base plate serves as the foundation platform. Its first end rotates around a fixed axis via a rotation center (e.g., a precision bearing or pivot structure), while the second end integrates an electromagnet as a dynamic locking mechanism. The supporting components are vertically connected between the rotating base plate and the bed board unit, forming a rigid support frame that evenly distributes the patient's load to the rotating base plate. When the electromagnet is de-energized, the strong magnetic field generated by its built-in permanent magnet attracts the armature at a preset position, achieving mechanical locking of the rotating base plate through magnetic force. When energized, the magnetic field generated by the external coil and the built-in permanent magnet cancels each other out, allowing the base plate to rotate freely. In some alternative embodiments, when the electromagnet is energized, its strong magnetic field attracts the armature at a preset position, achieving mechanical locking of the rotating base plate through magnetic force; when de-energized, the magnetic force disappears, allowing the base plate to rotate freely. This design replaces traditional mechanical latches, eliminating wear and achieving millisecond-level response locking. It is especially suitable for medical examination scenarios that require frequent angle adjustments. Its contactless locking mechanism can withstand shear forces of over 500N, ensuring patient stability.

[0032] The armature 3 has an arc-shaped or circular structure, and the rotating base plate 1 has a rotation angle range of ≥180° and can be locked at any angle position. The rotation center is set as a circular hole or cylinder, and the rotating base plate 1 is suspended above the ground.

[0033] In some embodiments, the examination bed also includes a control unit (not shown) for controlling the on / off state of the current of the electromagnet 2. The control unit acts as the power center of the electromagnet, precisely regulating the current flow through a relay or solid-state switch. Its core circuit includes an overcurrent protection module and a logic controller. When a locking command is received, the current output to the electromagnet is cut off, and the attraction between the permanent magnet built into the electromagnet and the armature is achieved through the magnetic force of the permanent magnet. In another embodiment, a 24V DC current is output to the electromagnet to generate a pulling force; a release command triggers the current cutoff, causing the magnetic field to decay instantaneously. This electronic control improves efficiency by more than 90% compared to mechanical transmission, achieving a zero-physical-contact operation mode and completely avoiding component fatigue failure caused by frequent operation of traditional mechanical locks. The control signal can be remotely transmitted through a low-voltage line (≤36V), completely eliminating the risk of electric shock, and is particularly compliant with medical device safety standards. The electromagnet (2) includes a temperature sensor and an overcurrent protection circuit, which automatically cuts off the power when the temperature exceeds a set threshold (70℃-90℃) or the current is greater than 150% of the rated value.

[0034] In some embodiments, the electromagnet 2 and / or armature 3 are provided with a first degree of freedom compensation mechanism that rotates around the Z-axis, so that the contact surfaces of the two remain parallel at the moment of contact; or the electromagnet 2 and / or armature 3 are also provided with a second degree of freedom compensation mechanism that rotates around the X-axis, which is used to counteract the overturning moment caused by lateral force.

[0035] The first degree of freedom compensation mechanism is designed for Z-axis (vertical axis) rotational deviation, allowing the electromagnet / armature to adaptively deflect ±5° in the horizontal plane. When the rotating base plate causes the electromagnet and armature planes to become non-parallel due to machining errors or foundation settlement, this mechanism automatically corrects the contact angle through elastic deformation, ensuring full contact of the suction surfaces. The second degree of freedom compensation mechanism addresses the X-axis (horizontal axis) rotation problem. It employs a high-rigidity cross-hinge structure, which absorbs overturning torque through deformation when the patient shifts and generates lateral forces, preventing local demagnetization of the electromagnet due to uneven force. This dual-degree-of-freedom compensation allows the system to tolerate installation position deviations of up to 3mm, improving the equipment's adaptability to environmental deformation.

[0036] In some embodiments, the armatures 3 are arranged circumferentially along the outer side of the first end of the rotating base plate 1, forming multiple discrete positioning points. The number of positioning points is ≥8, and the angular interval is ≤45°. The armatures are fixed on the base around the rotation center in a ring array, with more than 8 positioning points evenly distributed along a 360° circumference, and the maximum angular distance between adjacent points is 45°. This discrete layout forms a high-resolution positioning network, and when the rotating base plate moves above any armature, the electromagnet can complete the positioning and adsorption within 15ms. The 45° interval design ensures that there are at least 4 effective locking positions within a 180° rotation range, meeting the requirements for multi-angle positioning. The positioning points adopt a modular and detachable design, which facilitates the addition or reduction of the number according to the actual scenario, and can achieve a minimum angular resolution of 22.5°.

[0037] In some embodiments, the armature 3 is made of a soft magnetic alloy, and its contact surface is provided with an anti-wear coating with a coating thickness of 0.1-0.5 mm. The armature uses an Fe-Ni based soft magnetic alloy (such as 1J22), which has high saturation magnetic induction intensity (≥1.5T) and low coercivity characteristics, ensuring efficient magnetic circuit closure. The contact surface is sprayed with a 0.1-0.5 mm thick tungsten carbide ceramic coating. This thickness range has been experimentally verified to balance wear resistance and magnetic permeability: too thin a coating results in insufficient impact resistance, while too thick a coating leads to increased magnetic reluctance. The surface hardness of the coating reaches HV1200 or higher, ensuring that the wear of the armature is <5 μm after 100,000 contact tests, while maintaining a magnetic permeability of over 3000 H / m, significantly extending the life of key components.

[0038] In some embodiments, the armature 3 can be arranged above, below, or to the side of the electromagnet 2; the switching on and off of the electromagnet 2 can achieve the attraction or separation of the electromagnet and the armature 3. The topological relationship between the electromagnet and the armature has three-dimensional configurability: when the armature is located above the electromagnet, it forms a suspension-type lock; when located below, it forms a support-type lock for fixing the base to the ground; a lateral arrangement can achieve horizontal locking. This multi-directional compatible design allows the device to adapt to the spatial layout constraints of different hospitals.

[0039] In some embodiments, an annular (or disc-shaped) rotating washer 4 is also included, which may be made of non-magnetic metal or non-metallic material. One or more armatures 3 are provided on the rotating washer. Furthermore, one or two limiting blocks 7 are provided on the rotating washer to stop the rotating base plate 1.

[0040] In some embodiments, a swivel caster 10 is provided at the bottom of the second end of the rotating base plate 1. The swivel caster 10 is supported by a rotating pad 4 and can move on the rotating pad 4. The swivel caster is directly integrated into the bottom of the second end of the rotating base plate and adopts a combination structure of double-rimmed polyurethane wheels and a precision slewing bearing. The caster diameter is ≥100mm, the static load is 500kg, and when the electromagnet is released, the entire bed can be driven to rotate by medical staff applying a horizontal thrust of ≤50N. The slewing bearing has a built-in angular contact bearing, which reduces the coefficient of rotational friction to below 0.01, enabling smooth rotation for single-handed operation, while eliminating the slippage problem present in traditional rollers.

[0041] In some embodiments, an electromagnet bracket 12 is also included at the second end of the rotating base plate 1. The electromagnet 2 is movably connected to the electromagnet bracket 12, and the electromagnet rotates relative to the X-axis of the electromagnet bracket. The electromagnet bracket is a high-strength aluminum alloy casting and is rigidly fixed to the edge of the rotating base plate by four bolts. The bracket is provided with a U-shaped hinge seat, and the electromagnet housing forms an X-axis rotation pair with it through a pin, allowing the electromagnet to swing ±3° around the horizontal axis. This movable connection design compensates for the tilt of the bracket mounting surface caused by uneven ground, ensuring that the electromagnet's contact surface always automatically remains horizontal, avoiding vibration noise caused by one-sided contact.

[0042] In some implementations, the control unit supports multi-mode triggering, including at least one of the following: a physical button; a voice control module that responds to specific frequency commands; and a light sensing module that identifies preset light signals. The control unit integrates a multi-modal triggering interface: the physical button uses an IP67-rated emergency stop switch; the voice control module is equipped with a microphone array with noise reduction algorithms, capable of recognizing sound wave commands at 2kHz ± 10%; and the light sensing module decodes 800-1000nm pulsed light signals via an infrared sensor. The three systems operate independently, and any trigger signal can activate the control logic, ensuring operational reliability in noisy operating room environments or when medical staff's hands are contaminated. The system response delay is <100ms.

[0043] In some embodiments, the second degree-of-freedom compensation mechanism rotating about the X-axis includes a cross-roller bearing with a radial stiffness >100 N / μm and an axial stiffness >50 N / μm. The core component of the second degree-of-freedom compensation mechanism is the cross-roller bearing, whose special raceway design enables a radial stiffness of 120 N / μm (i.e., 120 N of force is required for every micrometer of deformation) and an axial stiffness of 60 N / μm. This ultra-high stiffness characteristic ensures that when a patient suddenly moves, generating a 300 N·m overturning moment, the bearing deformation is controlled within 5 μm, thereby maintaining the change in the electromagnet's engagement surface clearance <0.01 mm and completely avoiding accidental disengagement due to mechanical deformation.

[0044] Another embodiment of this application discloses a rotation control method for an examination bed, applied to the examination bed described above, characterized by the following steps: receiving a rotation command and controlling the electromagnet 2 to de-energize and release the armature 3; detecting that the rotating base plate 1 has moved to the target angle; triggering the electromagnet 2 to be energized or de-energized, and then engaging and locking it after adaptive adjustment by a degree-of-freedom compensation mechanism.

[0045] This control method achieves precise three-stage operation based on the aforementioned examination bed hardware: First, it receives rotation commands from buttons / sound / light signals, and the control unit activates the electromagnet current to achieve millisecond-level release; the encoder monitors the rotation angle in real time, and the electromagnet is de-energized when the rotation enters the target angle range of ±2°; during the magnetic attraction process, the degree-of-freedom compensation mechanism automatically corrects mechanical deviations, ultimately locking within the target angle range of ±0.5°. The entire process takes less than 3 seconds, improving efficiency by more than 5 times compared to traditional manual locking, and achieving an angle repeatability accuracy of ±0.1°, meeting the positional accuracy requirements for imaging examinations.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An examination bed, characterized in that: It includes a rotating base plate (1), a bed board unit (5), and a support member (6). The bottom end of the support member (6) is connected to the rotating base plate (1), and the top end of the support member (6) is connected to the bed board unit (5). The first end of the rotating base plate (1) is provided with a rotation center (11). The rotating base plate (1) is configured to rotate around the rotation center. The second end of the rotating base plate (1) is provided with an electromagnet (2) for engaging or disengaging with an armature (3) at a set position.

2. The examination bed according to claim 1, characterized in that: The examination bed also includes a control unit for controlling the switching on and off of the current in the electromagnet (2).

3. The examination bed according to claim 1, characterized in that: The electromagnet (2) and / or armature (3) are provided with a first degree of freedom compensation mechanism that rotates around the Z-axis so that the attraction surfaces of the two remain parallel at the moment of attraction; or the electromagnet (2) and / or armature (3) are also provided with a second degree of freedom compensation mechanism that rotates around the X-axis to counteract the overturning moment caused by the lateral force.

4. The examination bed according to claim 1, characterized in that: The armature (3) is arranged circumferentially along the outer side of the first end of the rotating base plate (1) to form multiple discrete positioning points. The number of positioning points is ≥8 and the angle interval is ≤45°.

5. The examination bed according to claim 1, characterized in that: The armature (3) is made of soft magnetic alloy material, and its contact surface is provided with an anti-wear coating with a coating thickness of 0.1-0.5mm.

6. The examination bed according to claim 1, characterized in that: The armature (3) can be arranged above, below or to the side of the electromagnet (2); the switching on and off of the electromagnet (2) can realize the attraction or separation of the electromagnet and the armature (3).

7. The examination bed according to claim 1, characterized in that: The bottom of the second end of the rotating base plate (1) is provided with a rotating caster (10).

8. The examination bed according to claim 1, characterized in that: It also includes an electromagnet bracket (12) disposed at the second end of the rotating base plate (1), wherein the electromagnet (2) is movably connected to the electromagnet bracket (12), and the electromagnet rotates relative to the X-axis of the electromagnet bracket.

9. The examination bed according to claim 2, characterized in that: The control unit supports multi-mode triggering, including at least one of the following: Physical buttons; The voice control module responds to specific frequency commands; The light sensor module identifies preset light signals.

10. The examination bed according to claim 1, characterized in that: It also includes a position feedback module, which includes an angle encoder and indicator lights to display the locked angle position of the rotating base plate (1) in real time.

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