Bed device and medical diagnosis system

Abstract

The invention provides a bed device and a medical diagnosis system which can reduce the height of the lowest position of a lying board and reduce the capacity of an actuator. The bed device is provided with a jack arm (64) which connects a first arm (20) of a universal arm (16) and a rod (58) in the vertical direction, the upper end portion (64A) of the jack arm (64) is connected to the upper end portion (58A) of the rod (58), and the lower end portion (64B) of the jack arm (64) is rotatably connected to a position between an intersection portion (22) and the upper end portion of the first arm (20).

Description

Technical Field

[0001] The present invention relates to a bed device and a medical diagnosis system, and in particular to a bed device and a medical diagnosis system for a medical image pickup device. Background Art

[0002] When a medical image of a subject is captured by a medical imaging device, it is performed using a dedicated bed device installed in an examination room. As medical imaging devices, magnetic resonance imaging (MRI) devices and X-ray CT (Computed Tomography) devices are known.

[0003] Patent Document 1 discloses a bed device in which a top board is moved up and down by driving an X-shaped link mechanism by extending and retracting a jack.

[0004] Patent Document 2 discloses a bed device in which a middle bed (bed board) is moved up and down by extending and retracting a piston rod of a hydraulic cylinder to extend and retract a telescopic cover.

[0005] In the field of bed devices, it is desired to reduce the height of the lowest position of a bed surface in order to reduce the burden on a subject. The bed surface refers to the upper surface of a bed on which the subject is placed.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-297145

[0007] Patent Document 2: Japanese Patent Application Publication No. 2019-115980

[0008] The bed device of Patent Document 1 is a structure that applies thrust in a direction inclined relative to the vertical direction to raise and lower the reclining board, so that the height of the lowest position of the reclining board surface can be lowered. However, since the thrust required near the lowest position of the reclining board surface becomes larger, there is a problem that an actuator with a large capacity (power) is required.

[0009] On the other hand, the bed device of Patent Document 2 is structured to raise and lower the lying board by applying a certain thrust in the vertical direction, so the capacity of the actuator can be reduced. However, due to the limitation of the size of the actuator, there is a problem that the lowest position of the lying board surface becomes higher. Summary of the invention

[0010] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bed device and a medical diagnosis system capable of lowering the height of the lowest position of a lying surface and reducing the capacity of an actuator.

[0011] The invention of the bed device involved in the first embodiment comprises: a base component; a lifting component; an X-shaped universal arm, which has a first arm component and a second arm component that is rotatably connected to the first arm component at an intersection, and the lifting component is connected relative to the base component so that it can be lifted and lowered in the up and down directions; and an actuator that drives the universal arm, and the actuator has: a driving source; a rod component that moves in the up and down directions using the power of the driving source; and a first connecting component that connects the rod component and the first arm component in the up and down directions, the upper end of the first connecting component is connected to the upper end of the rod component, and the lower end of the first connecting component is rotatably connected to a position between the intersection and the upper end of the first arm component.

[0012] According to the bed device involved in the first embodiment, a first connecting component is used to connect the first arm component of the universal arm and the rod component in the up and down directions, and the upper end of the first connecting component is connected to the upper end of the rod component, and the lower end of the first connecting component is rotatably connected to the position between the intersection and the upper end of the first arm component. Therefore, the height of the lowest position of the lying board surface can be lowered and the capacity of the actuator can be reduced.

[0013] The bed device involved in the second embodiment of the present invention is preferably as follows: in the first embodiment, it has: a second connecting component that connects the actuator and the second arm component in the up and down direction, the upper end of the second connecting component is rotatably connected to a position between the intersection and the lower end of the second arm component, and the lower end of the second connecting component is connected to the lower end of the actuator.

[0014] The bed device according to the third aspect of the present invention is preferably as follows: in the first aspect, the bed device includes a horizontal movement support portion that supports the actuator so as to be movable in the horizontal direction.

[0015] The bed device according to a fourth aspect of the present invention is preferably as follows: in the first to third aspects, the raising and lowering member has a retreat hole for retreating the upper end of the rod member upward from the raising and lowering member when the raising and lowering member moves downward.

[0016] A medical diagnostic system according to a fifth aspect of the present invention includes: the bed device according to the first to third aspects; and a medical imaging device.

[0017] The medical diagnosis system according to the sixth aspect of the present invention is preferably as follows: in the fifth aspect, the lifting member of the bed device has a retreat hole for retreating the upper end of the rod member upward from the lifting member when the lifting member moves downward.

[0018] Effects of the Invention

[0019] According to the present invention, the height of the lowest position of the top board surface can be lowered, and the capacity of the actuator can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a block diagram of a medical diagnosis system according to an embodiment.

[0021] Figure 2 It is a perspective view showing main components of the bed device according to the embodiment.

[0022] Figure 3 This is a schematic diagram when the upper frame is in the highest position.

[0023] Figure 4 This is a schematic diagram when the upper frame is in the lowest position.

[0024] Figure 5 This is a schematic diagram of the upper frame being at the highest height using a threaded jack.

[0025] Figure 6 This is a schematic diagram of the upper frame being at its lowest height using a threaded jack.

[0026] Figure 7 It is a schematic diagram of a bed device according to a modification.

[0027] Explanation of symbols

[0028] 10-bed device, 12-base, 14-upper frame, 16-universal arm, 18-threaded jack, 20-1st arm, 22-cross portion, 24-2nd arm, 50-motor, 58-rod, 64-jack arm, 66-jack arm, 80-retreat hole, 100-bed device, 102-linear guide, 150-MRI device, 200-medical diagnostic system. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of a bed device and a medical diagnosis system according to the present invention will be described with reference to the accompanying drawings.

[0030] In order to facilitate the description of the configuration of the bed device and the medical diagnosis system of the embodiment, the scale of each element shown in the drawings may be different from the scale of the actual element. Therefore, the elements shown in the drawings are not limited to the specific scale shown in the drawings.

[0031] Figure 1 1 is an overall diagram of a medical diagnosis system 200 according to the embodiment. The medical diagnosis system 200 of this example includes the bed device 10 according to the embodiment and an MRI device 150. The MRI device 150 includes a gantry 154 having a bore 152 as a cylindrical imaging space.

[0032] In this example, an MRI device 150 is used as a medical imaging device, but the present invention is not limited to the MRI device 150, and may be an X-ray CT device, a PET (Positron Emission Tomography) device, a radiotherapy device, or a particle beam therapy device. The bed device 10 of the embodiment will be described below.

[0033] like Figure 2 As shown, the bed device 10 of the embodiment includes: a base 12 installed on the floor of the examination room, an upper frame 14, an X-shaped universal arm 16 that moves the upper frame 14 up and down relative to the base 12, and a screw jack 18 that drives the universal arm 16. Figure 2 2 shows a state where the upper frame 14 is located (raised to) the highest position.

[0034] The structure of the bed device 10 of the embodiment is described in detail below. In this specification, the three-dimensional rectangular coordinate system of the X, Y, and Z axes is used for description. In this case, the X-axis direction refers to the horizontal direction, the Y-axis direction refers to the horizontal direction orthogonal to the X-axis direction, and the Z-axis direction refers to the up-down direction orthogonal to the X-axis direction and the Y-axis direction, respectively. Figure 2 In the description, the left side of the bed device 10 is referred to as the X(+) direction, the right side is referred to as the X(-) direction, the front side is referred to as the Y(+) direction, the back side is referred to as the Y(-) direction, the upper side is referred to as the Z(+) direction, and the lower side is referred to as the Z(-) direction.

[0035] As described above, the bed device 10 according to the embodiment includes the base 12 , the upper frame 14 , the universal arm 16 , and the screw jack 18 .

[0036] The base 12 and the upper frame 14 are configured as plate-like members that are arranged opposite to each other in the Z-axis direction and each has a longitudinal axis in the X-axis direction. In addition, 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. Figure 2 In the figure, other components such as a bottom plate mounted on the upper frame 14, and a cover covering the universal arm 16 and the screw jack 18 are omitted.

[0037] The universal arm 16 includes a pair of first arms 20 and a pair of second arms 24 rotatably connected to the pair of first arms 20 at a cross portion 22. The universal arm 16 is a member that connects the upper frame 14 to the base 12 so that it can be raised and lowered in the vertical (Z-axis) direction. The universal arm 16 is an example of the universal arm of the present invention.

[0038] The first arm 20 and the second arm 24 are each formed as a long plate-like member having a longitudinal axis. The first arm 20 and the second arm 24 are formed to have the same length in the longitudinal axis direction. The intersection 22 is set at the middle position of the first arm 20 and the second arm 24 in the longitudinal axis direction.

[0039] The pair of first arms 20 are arranged at positions overlapping each other in the Y-axis direction, and the pair of second arms 24 are also arranged at positions overlapping each other in the Y-axis direction. Furthermore, each pair of first arms 20 and second arms 24 are arranged between the base 12 and the upper frame 14 to intersect each other in the XZ plane.

[0040] A shaft 26 along the Y axis is connected to the upper end of the pair of first arms 20 on the upper frame 14 side. The shaft 26 is rotatably connected to a bearing unit 28 fixed to the upper frame 14. In the following description, the expression "a pair" is omitted. The same is true for another pair of components such as the second arm 24.

[0041] A roller 30 that rotates about the Y axis is provided at the lower end of the first arm 20 on the base 12 side. The roller 30 is connected to a guide rail 32 fixed to the base 12 along the X axis direction so as to be rotatable and slidable in the X direction.

[0042] The first arm 20 configured in this manner can rotate in the XZ plane using the shaft 26 as a rotation fulcrum. The first arm 20 is an example of a first arm member of the present invention.

[0043] The second arm 24 is rotatably connected via a shaft 34 along the Y axis at the intersection portion 22 intersecting the first arm 20. That is, the first arm 20 and the second arm 24 are rotatably connected to each other via the shaft 34 in the XZ plane.

[0044] A shaft 36 along the Y-axis is connected to the lower end portion 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.

[0045] A roller 40 that rotates about the Y axis is provided at the upper end of the second arm 24 on the upper frame 14 side. The roller 40 is connected to a guide rail 42 fixed to the upper frame 14 along the X direction so as to be rotatable and slidable in the X direction.

[0046] The second arm 24 configured in this manner can rotate in the XZ plane with the shaft 36 as a rotation fulcrum. The second arm 24 is an example of the second arm member of the present invention.

[0047] Here, the positional relationship between the components constituting bed device 10 will be described.

[0048] Figure 3 It indicates the state when the upper frame 14 is at (raised to) the highest height (with Figure 2 In other words, it is a schematic diagram of the bed device 10 when the lying board surface (not shown) is at the highest height. Figure 3 In the embodiment, the threaded jack 18 is omitted (refer to Figure 2 ) icon.

[0049] and, Figure 4 1 is a schematic diagram of the bed device 10 when the upper frame 14 is at (is lowered to) the lowest height. In other words, it is a schematic diagram of the bed device 10 when the lying board surface (not shown) is at the lowest height. Figure 4 In the embodiment, the threaded jack 18 is omitted (refer to Figure 2 ) icon.

[0050] like Figure 3 and Figure 4 As shown, 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 of the first arm 20 and the second arm 24 in the longitudinal direction. As a result, the shaft 26 and the shaft 36 are arranged on the same axis in the Z direction. In addition, the roller 40 and the roller 30 are arranged at positions separated by an equal distance from the shaft 26 and the shaft 36 in the X-axis direction, and are arranged on the same axis in the Z direction.

[0051] If Figure 3 Universal arm 16 utilizes Figure 2 The driving force of the screw jack 18 is used to lower the rollers 40 and 30, and the rollers 40 and 30 move in the X (-) direction away from the shafts 26 and 36. In conjunction with this movement, the upper frame 14 moves downward in the Z (-) direction close to the base 12. As a result, the height of the upper frame 14 is increased from Figure 3 The highest position of Figure 4 The least significant bits are shown becoming progressively lower.

[0052] And, if Figure 4 Universal arm 16 utilizes Figure 2 The driving force of the screw jack 18 is used to lift the upper frame 14. The rollers 40 and 30 move in the X (+) direction relative to the shafts 26 and 36, and the upper frame 14 moves upward in the Z (+) direction away from the base 12 in conjunction with the movement. As a result, the height of the upper frame 14 is increased from Figure 4 The lowest position of Figure 3 The most significant bits shown become progressively higher.

[0053] Next, the threaded jack 18 (refer to Figure 2 ) for explanation.

[0054] Figure 5This is a schematic diagram of bed device 10 showing a state in which upper frame 14 is located at the highest position by the driving force of screw jack 18 . Figure 6 1 is a schematic diagram showing the bed device 10 in a state where 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 an actuator of the present invention.

[0055] like Figure 5 and Figure 6 As shown, the threaded jack 18 includes a motor 50 , a speed reducer 52 , a cylinder 54 , a nut 56 , and a rod 58 .

[0056] The motor 50 and the speed reducer 52 are mounted on the base 60 of the screw jack 18. The base 60 is a component that supports the lower end of the screw jack 18. The cylinder 54 is connected to the speed reducer 52. The nut 56 is integrally formed with the cylinder 54. The rod 58 is inserted into the cylinder 54, and a thread groove (not shown) that is screwed with the thread groove of the nut 56 is formed on the outer peripheral surface. In addition, the motor 50 is an example of a driving source of the present invention, and the rod 58 is an example of a rod member of the present invention.

[0057] Motor 50 Figure 5 and Figure 6 The rotating shaft 62 shown by the dotted line is mounted on the base 60 along the X-axis. The speed reducer 52 converts and reduces the rotation of the rotating shaft 62 around the X-axis into a rotation around the Z-axis and transmits it to the cylinder 54. In this example, a speed reducer having a worm gear is exemplified as the speed reducer 52, but it can also be applied to a speed reducer having a bevel gear, for example.

[0058] The cylinder 54 is connected to the reducer 52 in such a manner that the longitudinal axis (central axis) is along the Z axis, and rotates about the Z axis using the rotational force about the Z axis converted and reduced by the reducer 52. When the cylinder 54 rotates, the nut 56 provided on the same axis (Z axis) as the cylinder 54 rotates in the same direction about the Z axis.

[0059] When the nut 56 is rotated forward and reversely about the Z axis by the cylinder 54, the rod 58 moves up and down (extends and retracts) along the Z axis by the feed action based on the thread groove of the nut 56 and the thread groove of the rod 58. In addition, the rod 58 is connected to the first arm 20 via the jack arm 64 described later, so it does not rotate with the nut 56 and move up and down.

[0060] According to the threaded jack 18 thus constructed, the upper frame 14 can be moved up and down by applying a certain thrust in the vertical direction through the extension and retraction of the rod 58. Therefore, compared with an actuator that applies a thrust in a direction inclined relative to the vertical direction to raise and lower the upper frame (for example, the actuator of Patent Document 1), its capacity (power) can be reduced.

[0061] Furthermore, bed device 10 according to the embodiment includes jack arms 64 and 66 .

[0062] The jack arm 64 is a member that connects the rod 58 and the first arm 20 in the vertical 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 vertical direction (Z-axis direction). In addition, the jack arm 64 is an example of the first connecting member of the present invention, and the jack arm 66 is an example of the second connecting member of the present invention.

[0063] The jack arm 64 is configured as a plate-shaped member having a longitudinal axis in the Z-axis direction.

[0064] The upper end portion 64A of the jack arm 64 is connected to the upper end portion 58A of the rod 58. The jack arm 64 is connected so that its lower end portion 64B can be rotatably connected to the cross portion 22 (see FIG. 2 ) via a shaft 70 along the Y axis. Figure 2 ) and an intermediate position 68 between the upper end of the first arm 20.

[0065] That is, in the bed device 10 of the embodiment, as a structure for transmitting the thrust of the threaded jack 18 to the upper frame 14, a structure (hereinafter referred to as a "thrust offset structure") is adopted in which the thrust is transmitted from the upper end 58A of the rod 58 to the middle position 68 offset in the Z (-) direction via the jack arm 64. 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 middle position 68 corresponds to the length of the offset.

[0066] The intermediate position 68 includes a range that is substantially considered to be the intermediate position. Furthermore, the position where the shaft 70 is set is not limited to the intermediate position 68, and can be any position between the intersection 22 and the upper end of the first arm 20, for example, it can be a position deviated from the range that is substantially considered to be the intermediate position toward the shaft 34 side or the shaft 26 side.

[0067] The jack arm 66 is configured as a plate-shaped member having a longitudinal axis in the Z-axis direction.

[0068] The lower end 66B of the jack arm 66 is connected to the base 60 supporting the lower end of the screw jack 18. In addition, the jack arm 66 is connected so that the upper end 66A thereof is rotatably connected to the cross section 22 (see FIG. 1 ) via a shaft 74 along the Y axis. Figure 2 ) and an intermediate position 72 between the lower end of the second arm 24.

[0069] That is, the bed device 10 of the embodiment adopts the following structure (hereinafter referred to as "suspended swing support structure"): the screw jack 18 is suspended and supported from the middle position 72 of the second arm 24 via the jack arm 66, and the screw jack 18 is supported to be rotatable around the Y axis around the shaft 74.

[0070] Thus, the threaded jack 18 moves up and down in conjunction with the lifting and lowering action of the universal arm 16 and can move along the X-axis direction without changing its posture, that is, when the longitudinal axis of the rod 58 is along the Z-axis.

[0071] In addition, the intermediate position 72 includes a range that is substantially considered to be the intermediate position. Furthermore, the position where the shaft 74 is set is not limited to the intermediate position 72, and can be a position between the intersection 22 and the lower end of the second arm 24, for example, it can be a position deviated from the range that is substantially considered to be the intermediate position toward the shaft 34 side or the shaft 36 side.

[0072] Several comparative examples (Comparative Examples 1 and 2) are compared with the embodiment. When describing the configuration of the bed device of Comparative Examples 1 and 2, the same or similar components as those of the bed device 10 of the embodiment are denoted by the same reference numerals and described without showing them in the drawings.

[0073] [Comparative Example 1]

[0074] Comparative Example 1 is a bed device in which an upper end portion 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 operation of the rod 58 .

[0075] [Comparative Example 2]

[0076] Comparative Example 2 is a bed device in which the upper end portion 58A of the rod 58 is connected to the middle position 68 of the first arm 20 , and the universal arm 16 is raised and lowered by the extension and retraction of the rod 58 , thereby indirectly raising and lowering the upper frame 14 .

[0077] Compared with the bed devices of the above-mentioned comparative examples 1 and 2, the bed device 10 of the embodiment adopts 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 position that is at least lower than that of comparative example 1 by an amount corresponding to the offset length. Furthermore, since the stroke length of the rod 58 can be extended by an amount corresponding to the offset length, the upper frame 14 can be moved downward to a lower position than that of comparative example 2.

[0078] Therefore, according to the embodiment of the bed device 10, a jack arm 64 is adopted to connect the first arm 20 of the universal arm 16 and the rod 58 in the up and down directions, 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 the position between the intersection 22 and the upper end of the first arm 20, so that the height of the lowest position of the lying board surface can be lowered, and the capacity of the threaded jack 18 can be reduced (optimized).

[0079] Furthermore, the bed device 10 of the embodiment adopts a suspension rotation support structure using the jack arm 66. As a result, the upper frame 14 can be further lowered and moved. Figure 3 The distance (gap) in the Z-axis direction between the screw jack 18 (base 60) and the base 12 is equivalent to the distance (gap). Therefore, the height of the lowest position of the lying board surface can be further reduced.

[0080] And, if Figure 6 As shown, the upper frame 14 has a retreat hole 80 (refer to Figure 2 ), the escape hole 80 is used to allow the upper end portion 58A of the rod 58 to escape upward from the upper frame 14 when the upper frame 14 moves in the downward direction.

[0081] By providing the escape hole 80 in the upper frame 14 , the stroke length of the rod 58 can be extended by the length of the rod 58 protruding from the upper frame 14 in the Z(+) direction. This can further reduce the lowest position height of the lying surface.

[0082] In addition, the length of the rod 58 protruding from the escape hole 80 is preferably set according to the gap between the upper frame 14 and a top plate (not shown) provided on the upper surface side of the upper frame 14 .

[0083] Hereinafter, modifications of the bed device of the present invention will be described.

[0084] Figure 7 Schematic diagram showing a modified example of the bed device of the present invention. Figure 7 The variation shown is similar to Figures 2 to 6 The differences between the illustrated embodiments will be described below.

[0085] First, the bed device 10 of the embodiment adopts a suspension rotation support structure using a jack arm 66. In contrast, Figure 7The illustrated variation of the bed-raising device 100 adopts the following structure (hereinafter referred to as "sliding structure"): the threaded jack 18 (base 60) is mounted on the linear guide 102, and the threaded jack 18 is set to be able to slide freely along the X-axis (horizontal) direction using the linear guide 102. This point is a difference, and the other structures are the same. In addition, the linear guide 102 is an example of the horizontal movement support part of the present invention.

[0086] In addition, the linear motion guide 102 is provided on the base 12. As the linear motion guide 102, a known linear motion guide which is a commercially available product can be applied.

[0087] according to Figure 7 In the bed device 100, the threaded jack 18 slides in the X (+) direction and the X (-) direction in conjunction with the lifting and lowering action of the upper frame 14.

[0088] Even in the Figure 7 In the case of a sliding structure as in the bed device 100 of the present invention, since a thrust offset structure using the jack arm 64 is adopted, the height of the lowest position of the lying board surface can be lowered similarly to the bed device 10 of the embodiment, and the capacity of the screw jack 18 can be reduced.

[0089] As mentioned above, although embodiment of the bed device which concerns on this invention was demonstrated, this invention can make several improvements or modifications within the range which does not deviate from the summary of this invention.

Claims

1. A bed device, comprising: Base components; Lifting components; An X-shaped universal arm having a first arm member and a second arm member rotatably connected to the first arm member at an intersection, and the lifting member is connected to the base member so as to be able to be lifted and lowered in the vertical direction; and an actuator, driving the universal arm, The actuator has: Driving source; a rod member that moves in an up-down direction using power from the driving source; and The first connecting member connects the rod member and the first arm member in the up-down 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.

2. The bed device according to claim 1, comprising: The second connecting member connects the actuator and the second arm member in the up-down direction, the upper end of the second connecting member is rotatably connected to a position between the intersection and the lower end of the second arm member, and the lower end of the second connecting member is connected to the lower end of the actuator.

3. The bed device according to claim 1, comprising: The horizontal movement support portion supports the actuator so as to be movable in the horizontal direction.

4. The bed device according to any one of claims 1 to 3, wherein: The lifting member has a retraction hole for causing the upper end portion of the rod member to retract upward from the lifting member when the lifting member moves in a downward direction.

5. A medical diagnostic system comprising: The bed device according to any one of claims 1 to 4; and Medical imaging device.

6. The medical diagnostic system according to claim 5, wherein: The lifting member of the bed device has a retreat hole for allowing the upper end of the rod member to retreat upward from the lifting member when the lifting member moves in a downward direction.

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