Bed apparatus and medical diagnostic system

Abstract

To provide a bed apparatus and a medical diagnostic system capable of reducing a capacity of an actuator while lowering a lowest height of a tabletop surface.SOLUTION: A jack arm 64 that connects a first arm 20 and a rod 58 of a pantograph arm 16 in an up-down direction is provided, an upper end part 64A of the jack arm 64 is connected to an upper end part 58A of the rod 58, and a lower end part 64B of the jack arm 64 is rotationally movably connected to a position between an intersection part 22 and an upper end part of the first arm 20.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a bed apparatus and a medical diagnostic system, and more particularly to a bed apparatus and a medical diagnostic system used in a medical imaging apparatus. [Background technology]

[0002] When a medical image of a subject is captured by a medical imaging device, a dedicated bed device installed in an examination room is used. Known medical imaging devices include a magnetic resonance imaging (MRI) device and an X-ray computed tomography (CT) device.

[0003] Patent Document 1 discloses a bed device in which a tabletop is raised and lowered by extending and retracting a jack to drive an X-shaped link mechanism.

[0004] Patent Document 2 discloses a bed device in which a middle floor (top plate) is raised and lowered by extending and retracting a telescopic cover by extending and retracting a piston rod of a hydraulic cylinder.

[0005] In the field of bed apparatuses, it is desirable to lower the height of the lowest position of the tabletop surface in order to reduce the burden on the subject. The tabletop surface is the upper surface of the tabletop on which the subject is placed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2009-297145 A [Patent Document 2] JP 2019-115980 A Summary of the Invention [Problem to be solved by the invention]

[0007] The bed device in Patent Document 1 is configured to raise and lower the tabletop by applying a thrust force in a direction inclined obliquely to the up-down direction, so it is possible to lower the height of the lowest level of the tabletop surface. However, since the thrust force required near the lowest level of the tabletop surface becomes large, there is a problem in that an actuator with a large capacity (power) is required.

[0008] On the other hand, the bed device of Patent Document 2 is configured to raise and lower the tabletop by applying a constant thrust in the vertical direction, which makes it possible to reduce the capacity of the actuator. However, since it is limited by the size of the actuator, there is a problem that the lowest height of the tabletop surface becomes high.

[0009] The present invention has been made in consideration of the above circumstances, and has an object to provide a bed apparatus and a medical diagnostic system that can reduce the capacity of the actuator while lowering the lowest height of the table top surface. [Means for solving the problem]

[0010] The invention of a first aspect of a bed device has a base member, a lifting member, a first arm member, and a second arm member connected to the first arm member at an intersection so that they can be freely rotatably connected to each other, and is equipped with an X-shaped pantograph arm that connects the lifting member to the base member so that it can be raised and lowered in the vertical direction, and an actuator that drives the pantograph arm, and the actuator has a drive source, a rod member that moves in the vertical direction by the power of the drive source, and a first connecting member that connects the rod member and the first arm member in the vertical direction, the upper end of the first connecting member is connected to the upper end of the rod member, and the lower end of the first connecting member is rotatably connected to a position between the intersection and the upper end of the first arm member.

[0011] The bed device of the first aspect is provided with a first connecting member that connects the first arm member and rod member of the pantograph arm in the vertical direction, and the upper end of the first connecting member is connected to the upper end of the rod member and the lower end of the first connecting member is rotatably connected to a position between the intersection point and the upper end of the first arm member. This makes it possible to reduce the capacity of the actuator while lowering the lowest height of the table top surface.

[0012] A bed device according to a second aspect of the present invention, in the first aspect, preferably has a second connecting member that connects the actuator and the second arm member in the vertical direction, wherein an upper end of the second connecting member is rotatably connected to a position between the intersection portion and the lower end of the second arm member, and a lower end of the second connecting member is connected to the lower end of the actuator.

[0013] The bed apparatus according to a third aspect of the present invention is in accordance with the first aspect, and preferably further comprises a horizontal movement support section that supports the actuator so as to be movable in the horizontal direction.

[0014] In the bed device according to the fourth aspect of the present invention, in the first to third aspects, it is preferable that the lifting member has an escape hole for allowing the upper end of the rod member to escape upward from the lifting member when the lifting member is moved downward.

[0015] A medical diagnostic system according to a fifth aspect of the present invention includes the bed apparatus according to the first to third aspects and a medical imaging apparatus.

[0016] A sixth aspect of the present invention relates to a medical diagnostic system according to the fifth aspect, and it is preferable that the lifting member of the bed device has an escape hole for allowing the upper end of the rod member to escape upward from the lifting member when the lifting member is moved downward. Effect of the Invention

[0017] According to the present invention, it is possible to reduce the capacity of the actuator while lowering the height of the lowest level of the top plate surface. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a configuration diagram of a medical diagnostic system according to an embodiment. [Diagram 2] FIG. 2 is a perspective view showing the main components of the bed apparatus according to the embodiment. [Diagram 3] FIG. 3 is a schematic diagram of the upper frame in the highest position. [Figure 4] FIG. 4 is a schematic diagram of the upper frame in the lowest position. [Diagram 5] FIG. 5 is a schematic diagram of the upper frame when positioned at the highest height by the screw jack. [Figure 6] FIG. 6 is a schematic diagram of the upper frame when positioned at the lowest height by the screw jack. [Figure 7] FIG. 7 is a schematic diagram of a bed apparatus according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a bed apparatus and a medical diagnostic system according to the present invention will be described with reference to the accompanying drawings.

[0020] For the convenience of explaining the configurations of the bed apparatus and the medical diagnosis system of the embodiment, the scale of each element illustrated in the attached drawings may differ from the actual scale of the element. Therefore, the illustrated elements are not limited to the specific scale illustrated in the drawings.

[0021] 1 is an overall view of a medical diagnostic system 200 according to an embodiment. The medical diagnostic system 10 of this example includes a bed device 10 according to the embodiment and an MRI device 150. The MRI device 150 includes a gantry 154 having a bore 152 which is a cylindrical imaging space.

[0022] In this example, an MRI apparatus 150 is illustrated as a medical imaging apparatus, but the present invention is not limited to the MRI apparatus 150, and may be an X-ray CT apparatus, a PET (Positron Emission Tomography) apparatus, a radiotherapy apparatus, or a particle beam therapy apparatus. Hereinafter, a bed apparatus 10 according to an embodiment will be described.

[0023] As shown in Fig. 2, the bed device 10 of the embodiment includes a base 12 placed on the floor of an examination room, an upper frame 14, an X-shaped pantograph arm 16 that raises and lowers the upper frame 14 relative to the base 12, and a screw-type jack 18 that drives the pantograph arm 16. Note that Fig. 2 shows a state in which the upper frame 14 is positioned at the highest position (raised).

[0024] The configuration of the bed device 10 according to the embodiment will be described in detail below. In this specification, the description will be given using a three-dimensional Cartesian coordinate system of X, Y, and Z axes. In this case, the X-axis direction indicates the horizontal direction, the Y-axis direction indicates the horizontal direction perpendicular to the X-axis direction, and the Z-axis direction indicates the up-down direction perpendicular to the X-axis and Y-axis directions, respectively. In addition, in Fig. 2, the left side of the bed device 10 will be referred to as the X(+) direction, the right side as the X(-) direction, the front side as the Y(+) direction, the depth side as the Y(-) direction, the upper side as the Z(+) direction, and the lower side as the Z(-) direction.

[0025] As described above, the sleeping device 10 of the embodiment comprises the base 12, the upper frame 14, the pantograph arm 16 and the screw jack 18.

[0026] The base 12 and the upper frame 14 are disposed opposite each other in the Z-axis direction, and are each configured as a plate-like member having a longitudinal axis in the X-axis direction. The base 12 is an example of a base member of the present invention, and the upper frame 14 is an example of a lifting member of the present invention. In Fig. 2, other members such as a top plate attached to the upper frame 14, the pantograph arm 16, and a cover that covers the screw jack 18 are omitted from the illustration.

[0027] The pantograph arm 16 has a pair of first arms 20 and a pair of second arms 24 rotatably connected to the pair of first arms 20 at an intersection 22. The pantograph arm 16 is a member that connects the upper frame 14 to the base 12 so that the upper frame 14 can be raised and lowered in the vertical (Z-axis) direction. The pantograph arm 16 is an example of a pantograph arm of the present invention.

[0028] The first arm 20 and the second arm 24 are each configured as a long plate-like member having a longitudinal axis. The first arm 20 and the second arm 24 are configured to have the same length in the longitudinal direction. The intersection 22 is set at a middle position between the first arm 20 and the second arm 24 in the longitudinal direction.

[0029] The pair of first arms 20 are disposed at positions overlapping each other in the Y-axis direction, and the pair of second arms 24 are also disposed at positions overlapping each other in the Y-axis direction. Each pair of first arms 20 and second arms 24 are disposed between the base 12 and the upper frame 14, intersecting each other in the XZ plane.

[0030] A shaft 26 aligned along the Y axis is connected to the upper ends of the pair of first arms 20 on the upper frame 14 side. This shaft 26 is rotatably connected to a bearing unit 28 fixed to the upper frame 14. In the following description, the expression "a pair" will be omitted. The same applies to other pairs of members such as the second arm 24.

[0031] A roller 30 that rotates around the Y axis is provided at the lower end of the first arm 20 on the base 12 side. This roller 30 is connected to a rail 32 fixed to the base 12 along the X axis direction so as to be rotatable and slidable in the X direction.

[0032] The first arm 20 configured in this manner is rotatable within the XZ plane about the axis 26. The first arm 20 is an example of a first arm member of the present invention.

[0033] The second arm 24 is rotatably connected to the first arm 20 at an intersection 22 via a shaft 34 along the Y axis. That is, the first arm 20 and the second arm 24 are rotatably connected to each other within the XZ plane via the shaft 34.

[0034] A shaft 36 aligned along the Y axis is connected to the lower end of the second arm 24 on the base 12 side. The shaft 36 is rotatably connected to a bearing unit 38 fixed to the base 12.

[0035] A roller 40 that rotates around the Y axis is provided at the upper end of the second arm 24 on the upper frame 14 side. This roller 40 is connected to a rail 42 fixed to the upper frame 14 along the X direction so as to be rotatable and slidable in the X direction.

[0036] The second arm 24 configured in this manner is rotatable within the XZ plane about the axis 36. The second arm 24 is an example of the second arm member of the present invention.

[0037] Here, the positional relationship of each member constituting the bed apparatus 10 will be described.

[0038] Fig. 3 is a schematic diagram of the bed apparatus 10 showing the state when the upper frame 14 is positioned (raised) at the highest height (the same state as Fig. 2). In other words, it is a schematic diagram of the bed apparatus 10 when the tabletop surface (not shown) is positioned at the highest height. Note that the screw jack 18 (see Fig. 2) is omitted from Fig. 3.

[0039] 4 is a schematic diagram of the bed apparatus 10 showing the state when the upper frame 14 is located at the lowest height (lowered). In other words, it is a schematic diagram of the bed apparatus 10 when the tabletop surface (not shown) is located at the lowest height. Note that the screw jack 18 (see FIG. 2) is not shown in FIG. 4.

[0040] 3 and 4, the first arm 20 and the second arm 24 are rotatably connected to each other at the intersection 22 via the shaft 34. As described above, the intersection 22 is set at the middle position in the longitudinal direction of each of the first arm 20 and the second arm 24. As a result, the shafts 26 and 36 are arranged on the same axis in the Z direction. Moreover, the rollers 40 and 30 are arranged at positions spaced an equal distance from the shafts 26 and 36 in the X-axis direction, and are arranged on the same axis in the Z direction.

[0041] When the pantograph arm 16 in Fig. 3 is lowered by the driving force of the screw jack 18 in Fig. 2, the rollers 40, 30 move in the X(-) direction away from the shafts 26, 36, and in conjunction with this movement, the upper frame 14 moves downward in the Z(-) direction approaching the base 12. As a result, the height of the upper frame 14 gradually decreases from the highest position in Fig. 3 to the lowest position shown in Fig. 4.

[0042] 4 is raised by the driving force of the screw jack 18 in FIG. 2, the rollers 40, 30 move in the X(+) direction toward the shafts 26, 36, and in conjunction with this movement, the upper frame 14 moves upward in the Z(+) direction away from the base 12. As a result, the height of the upper frame 14 gradually increases from the lowest position in FIG. 4 to the highest position shown in FIG. 3.

[0043] Next, the screw jack 18 (see FIG. 2) that drives the pantograph arm 16 will be described.

[0044] Fig. 5 is a schematic diagram of the bed device 10 showing the state when the upper frame 14 is located at the highest position by the driving force of the screw jack 18. Fig. 6 is a schematic diagram of the bed device 10 showing the state when the upper frame 14 is located at the lowest position by the driving force of the screw jack 18. The screw jack 18 is an example of the actuator of the present invention.

[0045] As shown in FIGS. 5 and 6, the screw jack 18 includes a motor 50, a reducer 52, a cylinder 54, a nut 56, and a rod 58.

[0046] The motor 50 and the reducer 52 are mounted on a base 60 of the screw jack 18. The base 60 is a member that supports the lower end of the screw jack 18. The cylinder 54 is connected to the reducer 52. The nut 56 is configured integrally with the cylinder 54. The rod 58 is inserted into the cylinder 54, and has a thread groove (not shown) formed on its outer circumferential surface that screws into the thread groove of the nut 56. The motor 50 is an example of a drive source of the present invention, and the rod 58 is an example of a rod member of the present invention.

[0047] The motor 50 is mounted on the base 12 so that a rotating shaft 62, indicated by a dotted line in Figures 5 and 6, is aligned along the X-axis. The reducer 52 converts the rotation of the rotating shaft 62 around the X-axis into rotation around the Z-axis, reduces the speed, and transmits the rotation to the cylinder 54. In this example, a reducer having a worm gear is exemplified as the reducer 52, but a reducer having a bevel gear, for example, may also be applied.

[0048] The cylinder 54 is connected to the reducer 52 so that its longitudinal axis (central axis) is aligned with the Z axis, and rotates about the Z axis by the rotational force about the Z axis converted and reduced by the reducer 52. When the cylinder 54 rotates, a nut 56 provided coaxially with the cylinder 54 (Z axis) rotates in the same direction about the Z axis.

[0049] When the nut 56 is rotated forward and backward around the Z axis by the cylinder 54, the rod 58 moves up and down (expands and contracts) along the Z axis due to the feeding action of the thread groove of the nut 56 and the thread groove of the rod 58. Note that since the rod 58 is connected to the first arm 20 via a jack arm 64 described below, it moves up and down without rotating together with the nut 56.

[0050] The screw jack 18 configured in this manner makes it possible to raise and lower the upper frame 14 by applying a constant thrust in the vertical direction through the extension and contraction of the rod 58. Therefore, it is possible to reduce the capacity (power) compared to an actuator that raises and lowers the upper frame by applying a thrust in a direction obliquely inclined relative to the vertical direction (for example, the actuator in Patent Document 1).

[0051] The bed device 10 of the embodiment also has jack arms 64 and 66.

[0052] The jack arm 64 is a member that connects the rod 58 and the first arm 20 in the up-down direction (Z-axis direction). The jack arm 66 is a member that connects the screw jack 18 (base 60) and the second arm 24 in the up-down direction (Z-axis direction). The jack arm 64 is an example of a first connecting member of the present invention, and the jack arm 66 is an example of a second connecting member of the present invention.

[0053] The jack arm 64 is configured as a plate-like member having a longitudinal axis in the Z-axis direction.

[0054] The jack arm 64 has an upper end 64A connected to the upper end 58A of the rod 58. The jack arm 64 has a lower end 64B connected to an intermediate position 68 between the intersection 22 (see FIG. 2) and the upper end of the first arm 20 via a shaft 70 along the Y axis so as to be rotatable.

[0055] That is, the bed device 10 of the embodiment employs a structure for transmitting the thrust of the screw jack 18 to the upper frame 14 from the upper end 58A of the rod 58 to an intermediate position 68 offset in the Z(-) direction via the jack arm 64 (hereinafter referred to as a "thrust offset structure"). Here, the distance between the connection point between the upper end 64A of the jack arm 64 and the upper end 58A of the rod 58 and the connection point between the lower end 64B of the jack arm 64 and the intermediate position 68 corresponds to the offset length.

[0056] The intermediate position 68 includes a range that is substantially recognized as the intermediate position. The position at which the shaft 70 is provided is not limited to the intermediate position 68, but may be any position between the intersection 22 and the upper end of the first arm 20, and may be, for example, a position shifted toward the shaft 34 side or the shaft 26 side from the substantially recognized range.

[0057] The jack arm 66 is configured as a plate-like member having a longitudinal axis in the Z-axis direction.

[0058] The jack arm 66 has a lower end 66B connected to the base 60 that supports the lower end of the screw jack 18. The jack arm 66 has an upper end 66A connected to an intermediate position 72 between the intersection 22 (see FIG. 2) and the lower end of the second arm 24 via a shaft 74 along the Y axis so as to be rotatable.

[0059] That is, the bed device 10 of the embodiment adopts a structure in which the screw jack 18 is suspended and supported from the intermediate position 72 of the second arm 24 via the jack arm 66, and the screw jack 18 is supported rotatably around the Y axis centered on the axis 74 (hereinafter referred to as a "suspended and rotatable support structure").

[0060] This allows the screw jack 18 to move up and down in conjunction with the lifting and lowering movement of the pantograph arm 16, while still being able to move along the X-axis direction without changing its posture, i.e., with the longitudinal axis of the rod 58 remaining aligned along the Z-axis.

[0061] The intermediate position 72 includes a range that is substantially recognized as the intermediate position. The position at which the shaft 74 is provided is not limited to the intermediate position 72, but may be any position between the intersection 22 and the lower end of the second arm 24, and may be, for example, a position shifted toward the shaft 34 side or the shaft 36 side from the substantially recognized range.

[0062] Below, several comparative examples (Comparative Examples 1 and 2) will be compared with the embodiment. Note that when describing the configuration of the bed device of Comparative Examples 1 and 2, illustrations will be omitted, but the same reference numerals will be used to denote the same or similar members as those of the bed device 10 of the embodiment.

[0063] Comparative Example 1 Comparative Example 1 is a bed apparatus in which an upper end 58A of a rod 58 is connected to an upper frame 14, and the upper frame 14 is directly moved up and down by the extension and contraction of the rod 58.

[0064] Comparative Example 2 Comparative example 2 is a bed device in which the upper end 58A of the rod 58 is connected to an intermediate position 68 of the first arm 20, and the pantograph arm 16 is raised and lowered by the extension and contraction of the rod 58, thereby indirectly raising and lowering the upper frame 14.

[0065] In contrast to the bed devices of Comparative Examples 1 and 2, the bed device 10 of the embodiment employs a thrust offset structure using a jack arm 64. As a result, the bed device 10 of the embodiment can move the upper frame 14 downward to a lower position by at least the offset length compared to Comparative Example 1. In addition, since the stroke length of the rod 58 can be made longer by the offset length, the upper frame 14 can be moved downward to a lower position compared to Comparative Example 2.

[0066] Therefore, according to the embodiment of the bed device 10, a jack arm 64 is provided that connects the first arm 20 of the pantograph arm 16 and the rod 58 in the vertical direction, and the upper end 64A of the jack arm 64 is connected to the upper end 58A of the rod 58, and the lower end 64B of the jack arm 64 is rotatably connected to a position between the intersection 22 and the upper end of the first arm 20.This makes it possible to reduce (optimize) the capacity of the screw jack 18 while lowering the height of the lowest point of the table top surface.

[0067] Furthermore, the bed device 10 of the embodiment employs a hanging and rotating support structure using a jack arm 66. This allows the upper frame 14 to be further lowered by the distance (gap) in the Z-axis direction between the screw jack 18 (base 60) and the base 12 in Fig. 3. This allows the lowest height of the table top surface to be further lowered.

[0068] Also, as shown in FIG. 6, the upper frame 14 has an escape hole 80 (see FIG. 2) for allowing the upper end 58A of the rod 58 to escape upward from the upper frame 14 when the upper frame 14 is moved downward.

[0069] By providing the escape hole 80 in the upper frame 14, the stroke length of the rod 58 can be increased by the length of the rod 58 protruding in the Z(+) direction from the upper frame 14. This makes it possible to further lower the lowest height of the top plate surface.

[0070] The length of the rod 58 protruding from the escape hole 80 is preferably set in accordance with the gap between the upper frame 14 and a top plate (not shown) provided on the upper surface side of the upper frame 14 .

[0071] Modifications of the bed apparatus of the present invention will now be described.

[0072] 7 is a schematic diagram showing a modified example of the bed apparatus of the present invention. The differences between the modified example shown in FIG. 7 and the embodiment shown in FIG.

[0073] First, the bed device 10 of the embodiment employs a hanging and rotating support structure using a jack arm 66. In contrast, the bed device 100 of the modified example shown in Fig. 7 employs a structure (hereinafter referred to as a "slide structure") in which a screw jack 18 (base 60) is mounted on a linear guide 102, and the linear guide 102 is used to allow the screw jack 18 to slide freely in the X-axis (horizontal) direction. This is the only difference, and the other configurations are the same. The linear guide 102 is an example of a horizontal movement support section of the present invention.

[0074] The linear guide 102 is installed on the base 12. As the linear guide 102, a known linear guide that is commercially available can be used.

[0075] According to the bed apparatus 100 of FIG. 7, the screw jack 18 slides in the X(+) direction and the X(-) direction in conjunction with the lifting and lowering movement of the upper frame 14.

[0076] Even when a sliding structure is adopted as in the bed device 100 of Figure 7, a thrust offset structure using a jack arm 64 is adopted, so that it is possible to reduce the capacity of the screw jack 18 while lowering the lowest height of the table top surface as in the bed device 10 of the embodiment.

[0077] Although the embodiment of the bed apparatus according to the present invention has been described above, the present invention may be improved or modified in several ways without departing from the gist of the present invention. [Explanation of symbols]

[0078] 10 Sleeping device 12 Base 14 Upper frame 16 Panther Arm 18 Screw Jack 20 First Arm 22 Intersection 24 Second Arm 50 Motor 58 Rod 64 Jack Arm 66 Jack arm 80 Relief hole 100 Bed System 102 Linear guide 150 MRI machine 200 Medical Diagnostic Systems

Claims

1. A base member; A lifting member; an X-shaped pantograph arm including a first arm member and a second arm member rotatably connected to the first arm member at an intersection thereof, the pantograph arm connecting the lifting member to the base member so as to be liftable in the vertical direction; An actuator that drives the pantograph arm; Equipped with The actuator comprises: A driving source; a rod member that moves up and down by the power of the drive source; a first connecting member that connects the rod member and the first arm member in the up-down direction, the first connecting member having an upper end connected to an upper end of the rod member and a lower end connected to a position between the intersection portion and the upper end of the first arm member so as to be rotatable; having Sleeping device.

2. a second connecting member that connects the actuator and the second arm member in the up-down direction, the upper end of the second connecting member being rotatably connected to a position between the intersection portion and a lower end of the second arm member, and the lower end of the second connecting member being connected to a lower end of the actuator; The sleeper apparatus according to claim 1 .

3. A horizontal movement support part that supports the actuator so as to be movable in a horizontal direction. The sleeper apparatus according to claim 1 .

4. the lifting member has an escape hole for allowing an upper end of the rod member to escape upward from the lifting member when the lifting member is moved downward; The bed apparatus according to any one of claims 1 to 3.

5. A bed device according to any one of claims 1 to 3, A medical imaging device; A medical diagnostic system comprising:

6. the lifting member of the bed device has an escape hole for allowing an upper end of the rod member to escape upward from the lifting member when the lifting member is moved downward; The medical diagnostic system of claim 5.

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