WO2010123024A1 - 医用画像撮影装置用寝台 - Google Patents
医用画像撮影装置用寝台 Download PDFInfo
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- WO2010123024A1 WO2010123024A1 PCT/JP2010/057054 JP2010057054W WO2010123024A1 WO 2010123024 A1 WO2010123024 A1 WO 2010123024A1 JP 2010057054 W JP2010057054 W JP 2010057054W WO 2010123024 A1 WO2010123024 A1 WO 2010123024A1
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- WIPO (PCT)
- Prior art keywords
- upper frame
- lateral
- rail receiving
- along
- movement device
- Prior art date
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- 238000002059 diagnostic imaging Methods 0.000 title claims abstract description 12
- 238000003384 imaging method Methods 0.000 description 11
- 241000270295 Serpentes Species 0.000 description 4
- 230000003028 elevating effect Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 1
- 238000013170 computed tomography imaging Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/04—Positioning of patients; Tiltable beds or the like
- A61B6/0407—Supports, e.g. tables or beds, for the body or parts of the body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/04—Positioning of patients; Tiltable beds or the like
- A61B6/0487—Motor-assisted positioning
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
Definitions
- the present invention relates to a medical image photographing apparatus bed, and more particularly to a medical image photographing apparatus bed that can easily adjust the photographing visual field of a subject placed on a top board.
- an X-ray CT apparatus When performing CT imaging with an X-ray CT apparatus, imaging is performed around the body axis of the subject, so a wide range of imaging is required to image organs such as the heart that are off the center of the body axis, As a result, the exposure dose increases. Therefore, as one of the methods for reducing the exposure dose in the area other than the imaging target, in order to position the imaging target at a position deviated from the body axis center of the subject at the center of the range of the irradiation X-ray, There is a bed for an X-ray CT apparatus provided with a lateral movement device that moves in a direction perpendicular to the body axis direction.
- the bed for the X-ray CT apparatus of Patent Document 1 includes an upper frame between an upper frame that vertically moves a top plate on which a subject is placed and a lowermost base that moves the upper frame up and down. It is configured using a multi-stage drive mechanism comprising a lower frame provided with a mechanism for vertically moving the frame and a center base provided at the center for horizontally moving the lower frame.
- a multi-stage drive mechanism comprising a lower frame provided with a mechanism for vertically moving the frame and a center base provided at the center for horizontally moving the lower frame.
- the present invention has been made in view of the above problems, and is a bed for a medical image photographing apparatus provided with a lateral movement device that is light and has a smaller amount of deformation while suppressing an increase in the height of the bed at the bottom of the top plate.
- the purpose is to provide.
- the bed for the medical imaging apparatus is characterized in that the lifting device itself also serves as the lateral movement device, that is, the members constituting the lifting device include the lateral movement device. Specifically, it comprises a base, an upper frame that supports the top plate, and an elevating device that is positioned between the base and the upper frame and moves the upper frame up and down. And a lateral movement device that relatively moves at least two members constituting the lifting device along a lateral direction that is a direction orthogonal to the longitudinal direction of the upper frame within the top plate surface of the top plate. To do.
- the medical image photographing apparatus bed according to the present invention is characterized in that the vertical movement device itself also serves as the horizontal movement device, that is, the members constituting the vertical movement device include the horizontal movement device.
- the members constituting the vertical movement device include the horizontal movement device.
- the vertical movement device includes at least one member constituting the vertical movement device in a lateral direction that is perpendicular to the longitudinal direction of the upper frame with respect to the base in the top plate surface of the top plate. It is characterized by comprising a lateral movement device that relatively moves along.
- the horizontal moving device is medically imaged without providing an intermediate frame between the base and the upper frame. It can be added to the bed for the photographing device. Therefore, it is possible to provide a medical image photographing apparatus bed provided with a lateral movement device that is light and has a smaller amount of deformation while suppressing the height of the bed at the lowest position of the top board.
- FIG. 2 Schematic of an X-ray CT apparatus using a bed for a medical imaging apparatus according to the present invention
- the front view which shows the whole structure of the bed for medical image bed apparatuses which concerns on 1st embodiment.
- 2 is a front view showing a state where the upper frame moves vertically and rises in FIG. 2 is a side view of the upper frame as viewed from the direction a in the front view shown in FIG. 4 is a side view showing a state where the upper frame is lifted and moved leftward when the gantry is viewed in front.
- 2 is a side view when the upper frame is lowered when the upper frame is lowered as viewed from the b direction in the front view shown in FIG.
- FIG. 6 is a side view showing a state where the upper frame is lifted and moved rightward when the gantry is viewed in front.
- Partial enlarged view of a side view showing the main part of the lateral movement device One cross-sectional enlarged view at A-A ′ in FIG. Side view showing a lateral movement device according to the second embodiment.
- FIG. 10 is a cross-sectional enlarged view of B-B ′. The partially expanded view of the side view which shows the lateral movement apparatus which concerns on 3rd embodiment. The partial enlarged view of the side view which shows the lateral movement apparatus which concerns on 4th embodiment.
- Partial cross-sectional enlarged view at C-C 'in FIG. 14 is a partially enlarged cross-sectional view of a front view showing an alternative example of the mechanism shown in FIG.
- the first embodiment is an embodiment using a bed for a medical imaging apparatus (hereinafter referred to as “bed”) to which the present invention is applied to an X-ray CT apparatus.
- bed a medical imaging apparatus
- These components are shared as a vertical movement device and a horizontal movement device.
- FIG. 1 is an overall configuration diagram of an X-ray CT apparatus.
- the X-ray CT apparatus 100 in FIG. 1 is equipped with an X-ray tube device and an X-ray detector, rotates around the subject 102, detects the X-rays that have passed through the subject 102, and transmits a transmitted X-ray signal
- the X-ray CT apparatus 100 is controlled according to the imaging conditions input by the operator, the bed 103 for placing the subject 102 on the top plate and transporting it to the opening 101a of the gantry 101, and the imaging conditions input by the operator.
- a control device 104 having an image processing unit that performs imaging or receives a transmitted X-ray signal transmitted from the gantry 101 and generates a reconstructed image, and a display that displays the reconstructed image generated by the image processing unit
- a device 105 and an operation device 106 for inputting various instructions to the control device 104 are provided.
- the couch 103 is a couch to which the present invention is applied, and the control device 104 controls the up / down movement, horizontal movement, and vertical movement of the bed 103, and control of image processing and input operations.
- FIG. 2 is a front view showing the overall configuration of the medical image bed apparatus bed according to the first embodiment.
- FIG. 3 is a front view showing a state in which the upper frame in FIG. 2 moves vertically and rises.
- FIG. 4 is a side view when the upper frame is lowered as seen from the direction a in the front view shown in FIG.
- FIG. 5 is a side view showing a state in which the upper frame is lifted in FIG. 4 and moved leftward when the gantry is viewed in front.
- the bed 103 includes a top plate 1 on which a subject is placed, an upper frame 2 having a mechanism (not shown) that moves the top plate 1 in a longitudinal direction (hereinafter referred to as “longitudinal direction”), an upper frame 2 and a base 8. And a pantograph-type arm portion 22 for connecting the two.
- the arm portion 22 is configured so that the two panta arms 40 and 40 are disposed between the upper frame 2 and the base 8, and the wide and narrow directions of the panta arms 40 and 40 are parallel to the longitudinal direction of the top plate 1. Prepare and configure.
- Each punter arm 40 crosses the outer arm 5 and the inner arm 6 in a substantially X shape, and the crossing point is rotatably connected by a center pin 41.
- the upper end of the inner arm 6 is rotatably connected to the rail receiving block 15 on the upper frame 2 side by the rotating shaft 20, and the lower end is rotatably connected to the rail receiving block 16 on the base 8 side by the rotating shaft 21.
- the upper end portion of the outer arm 5 is rotatably connected to the rail receiving block 17 on the upper frame 2 side by the rotation shaft 18, and the lower end portion is rotatably connected to the fixed block 14 fixed to the upper surface of the base 8 by the rotation shaft 19. Since the center pin 41 and the rotation shafts 18, 19, 20, and 21 are shared by the two panta arms 40 and 40, the two panta arms 40 and 40 are coupled so as to be interlocked. Further, the rotary shafts 18, 19, 20, 21 may be directly connected to the upper frame and the rail receiving block, or indirectly connected via other members as in the third embodiment described later. May be.
- Two guide rails 3 and 3 are arranged in the vicinity of the left and right ends of the central portion in the longitudinal direction from the lower surface front portion of the upper frame 2, and the longitudinal direction of the top plate 1 and the axial direction of the guide rails 3 and 3 are parallel to each other. It is attached to become.
- Each guide rail 3 is fitted with rail receiving blocks 15 and 17 of each punter arm 40 and they slide along the guide rail 3.
- Two guide rails 4 and 4 are provided in the vicinity of the left and right ends of the rear portion of the upper surface of the base 8.
- Each guide rail 4 is fitted with a rail receiving block 16 of each punter arm 40 and slides along the guide rail 4.
- the hydraulic cylinder 7 is rotatably fixed to the rotary shaft 19 at the lower end of the outer arm 5.
- the drive shaft of the hydraulic cylinder 7 is pin-joined to the inner arm 6.
- the angle between the inner arm 6 and the outer arm 5 increases and decreases, the rail receiving blocks 15 and 17 slide along the guide rail 3, and the rail receiving block 16 Slide along the guide rail 4.
- the punter arms 40 and 40 are expanded and contracted to constitute an elevating device in which the upper frame 2 moves up and down (in the direction of arrow V) with respect to the base 8.
- the motor 9 is fixed to the rail receiving block 15 by a motor support frame 35.
- the drive shaft of the motor 9 is provided with a pinion gear 11.
- a rack 13 that is screwed with the pinion gear 11 is provided along the guide rail 3 on the lower surface front side of the upper frame 2.
- the motor 9 rotates, the pinion gear 11 and the rack 13 are screwed together, and the rotational movement of the pinion gear 11 is converted into a linear movement along the rack 13.
- the motor 9 and the rail receiving block 15 (and the rail receiving block 17 in conjunction therewith) slide along the guide rail 3, and the upper frame with respect to the rail receiving block 15 and the rail receiving block 17 (and the base 8). 2 moves relatively (arrow HL1 direction).
- a vertical movement device is configured to move the top plate 1 placed on the upper frame 2 in a direction toward the opening 101a (hereinafter referred to as “vertical direction” in the present embodiment).
- FIG. 6 is a side view of the upper frame as viewed from the b direction in the front view shown in FIG.
- FIG. 7 is a side view showing a state in which the upper frame is raised in FIG. 6 and moved rightward when the gantry is viewed in front.
- FIG. 8 is a partially enlarged view of a side view showing the main part of the lateral movement device.
- FIG. 9 is an enlarged cross-sectional view taken along line AA ′ of FIG.
- a rack 23 that serves as a support member for connecting the rail receiving blocks 17 of the left and right punter arms 40, 40 and a function for transmitting driving force is provided with respect to the longitudinal direction of the upper frame 2.
- the top plate 1 is attached along a direction (hereinafter referred to as “lateral direction”) orthogonal to the top plate surface of the top plate 1.
- the motor 10 is fixed to the rotating shaft 18 by a motor support frame 34.
- a pinion gear 12 is connected to the drive shaft of the motor 10, and the pinion gear 12 is engaged with the rack 23.
- a lateral movement device is configured to move the top board 1 and the upper frame 2 in the left-right direction with respect to the opening 101a.
- the lifting device, the lateral movement device, and the vertical movement device execute the following operations by controlling the hydraulic cylinder 7, the motor 9, and the motor 10 in accordance with a control signal from the control device 104.
- the upper frame 2 moves up and moves vertically until the top plate 1 is positioned at the height of the gantry opening 101a from the lowest position.
- the angle between the inner arm 6 and the outer arm 5 changes as the hydraulic cylinder 7 extends, and the rail receiving block 16 of the inner arm 6 and the rail receiving block of the outer arm 5 change. 17 slides along the guide rails 4 and 3 to the gantry 101 side, and rises from the lowest level shown in FIGS. 2, 4, and 6 to the highest level shown in FIGS.
- each rail receiving block 16, 17 slides in the opposite direction (direction away from the gantry).
- the motor 9 rotates to rotate the pinion gear 11, and the pinion gear 11 sends the rack 13 to the gantry side and follows this.
- the top plate 1 and the upper frame 2 move forward with respect to the base 8 as shown in FIGS. 2 to 3 (in the direction of arrow HL1).
- the motor 9 rotates in the reverse direction.
- the top plate 1 is moved vertically relative to the upper frame 2 by a vertical movement device (not shown) (in the direction of arrow HL2).
- the upper frame 2 does not move vertically but only moves up and down.
- the rail receiving block 15 is fixed, and the rail receiving blocks 16 and 17 slide. Thereafter, the upper frame 2 moves laterally in order to align the center of the effective imaging range with the center of the imaging region that is shifted from the body axis (for example, the center of the heart).
- the pinion gear 12 rotates as the motor 10 attached to the rotary shaft 18 rotates, and when the rack 23 is sent to the right as shown in FIG. 7, the upper frame 2 is accompanied by the rail receiving block 17. Then, it moves laterally along the rotation axis 18 in the right direction. When moving leftward, the motor 10 rotates in the reverse direction.
- the vertical movement and the vertical movement are shared by the guide rail 3 and the rail receiving blocks 15 and 17, and the guide rail 4 and the rail receiving block 16 are shared, and the horizontal movement and the vertical movement are shared by the rail receiving block 15. And shared by 17.
- the rail receiving blocks 15 and 17 and the rotating shafts 20 and 18 are relatively moved in the lateral direction using a drive mechanism that is a combination of a pinion gear and a rack.
- the bed 103 can be moved laterally without requiring a multi-layer structure for moving the upper frame 2 vertically and horizontally.
- the vertical frame and the vertical movement drive mechanism are independent, so the position of the upper frame 2 can be freely set, and the bed 103 is maintained while maintaining the effective shooting range of the conventional bed. And a working space between the gantry 101 and the gantry 101 can be secured.
- the load from the upper frame 2 indicated by the arrow in FIG. 9 is received from the rail receiving block 17 (and 15). Because the distance to (the motor 10, the pinion gear 12, the rack 23, the rotating shaft 18, the rail receiving block 17, the motor support frame 34) is closer than the case where the lateral movement device is arranged near the base 8, The deformation (distortion) accompanying the lateral movement is reduced, and the lateral movement operation can be performed more stably.
- the subject placed on the top can be moved in the lateral direction, and X-rays to the non-imaging area can be obtained when imaging a specific area such as the heart. Irradiation can be reduced. Further, since the bed height at the lowest position is lowered, it is easier to get on and off an infant or a subject who is physically disabled. In addition, the number of parts used for the bed can be greatly reduced, the weight can be reduced, and the deformation of the movable part and the intermediate support member can be reduced.
- the bed according to the present embodiment includes a vertical movement device that vertically moves the upper frame with respect to the base, and a vertical movement device that moves the top plate with respect to the upper frame (not shown), thereby providing a gantry.
- the lateral movement device can be added without changing the height of the lowest level of the top board while keeping the distance between the bed and the bed wider. Therefore, since there is a sufficient working space between the bed and the gantry, it is easy to install the subject's head rest on the top plate and to install the C-arm X-ray fluoroscope between the bed and the gantry.
- the hydraulic cylinder 7 is used as the drive source of the lifting device, but an electric cylinder may be used instead of the hydraulic cylinder 7. Further, instead of the combination of the pinion gear and the rack, another drive mechanism such as a slide bush may be used.
- the number of the panta arms is not limited to two, and may be one.
- one punter arm may be connected to each rotating shaft, and the rotating shaft may be supported by the left and right rail receiving blocks.
- the lifting device includes the lateral movement device and the vertical movement device.
- the top plate can be laterally moved.
- the vertical movement device since the vertical movement device is not necessary, the length of the guide rail 3 is shorter than that of the first embodiment (provided only before the center in the longitudinal direction), and the upper frame 2 is replaced with the rail receiving block 17.
- An upper end portion of the outer arm 5 is rotatably connected to a fixed block fixed to the lower surface via a rotation shaft 18. Further, the motor 9, the pinion gear 11, and the rack 13 are not provided. Then, by using the lateral movement device of the first embodiment to relatively move the rotation shaft 18 and the fixed block in the lateral direction, a bed having only the lateral movement device in the lifting device can be configured.
- the second embodiment is a lateral movement device according to an alternative example of the lateral movement device of the first embodiment.
- the lateral movement device according to the second embodiment will be described with reference to FIGS.
- FIG. 10 is a side view of the lateral movement device according to the second embodiment
- FIG. 11 is an enlarged sectional view taken along line BB ′ of FIG.
- each rail receiving block 17 is provided with a through hole 17h for penetrating and supporting the rotary shaft 18, and a screw groove (not shown) screwed into the ball screw 24 is provided on the inner peripheral surface thereof.
- the motor 10 is fixed near the upper end of the outer arm 5 by the motor support frame 34.
- a driving pulley 27 is connected to the driving shaft of the motor 10.
- the ball screw 24 is also provided with a shaft side pulley 25.
- the driving pulley 27 and the shaft pulley 25 are connected by a timing belt 26.
- the motor 10 is driven to rotate, the driving pulley 27 is rotated, and this rotational motion is transmitted to the shaft pulley 25 via the timing belt 26.
- the shaft-side pulley 25 rotates, the shaft-side pulley 25 and the ball screw 24 rotate together, and along the axial direction of the ball screw 24, the ball screw 24 and the rail receiving blocks 17, 17 are connected to the shaft of the ball screw 24. Move relative to the direction (lateral direction). As a result, the upper frame 2 moves in the horizontal direction integrally with the rail receiving block 17.
- FIG. 12 is a partially enlarged view of a side view showing the lateral movement device according to the third embodiment.
- the lateral movement device according to the third embodiment is a lateral movement in which the rotating shaft 18 of the panta arm 40 and the rail receiving block 17 provided on the lower surface of the upper frame 2 are connected via a guide rail 28 along the lateral direction. Device.
- the rotating shaft 18 constituting the lifting device and the rail receiving block 17 constituting the lifting device and the longitudinal movement device are shared as parts of the lateral movement device.
- the rail receiving block has a function as a rotary bearing.
- the rail receiving block does not function as a rotary bearing.
- the outer frame 5 rotates.
- the rotating shaft 18 and the rail receiving block 17 are directly connected, but in this embodiment, the rotating shaft 18 and the rail receiving block 17 are lateral guides described later. It is indirectly connected via a rail.
- the lateral movement device includes guide rails 28 on the upper surfaces of the left and right ends of the rotating shaft 18, and rails at the lower ends of the rail receiving blocks 17, 17. Grooves 17a, 17a are provided along the lateral direction. As the guide rail 28 travels along the rail grooves 17a and 17a, the rail receiving block 17 and the rotary shaft 18 are relatively moved in the lateral direction. Furthermore, in the lateral movement device according to the present embodiment, a rack 23 that connects the left and right rail receiving blocks 17, 17 is provided.
- the motor 10 is fixed by a motor support frame 34 at a substantially central portion in the axial direction of the rotary shaft 18.
- a pinion gear 12 is connected to the drive shaft of the motor 10, and the pinion gear 12 is engaged with the rack 23.
- the fourth embodiment is a lateral movement device corresponding to another aspect of the lateral movement device using guide rails, in which the guide rail and the rail receiving block in the third embodiment (FIG. 12) are arranged upside down. It is a mobile device.
- the rotating shaft 18 and the rail receiving block 17 are directly connected.
- the rotating shaft 18 and the rail receiving block 17 are lateral guides described later. It is indirectly connected via a rail, a lateral rail receiving block and a support block.
- FIG. 13 is a partially enlarged view of a side view showing the lateral movement device according to the fourth embodiment
- FIG. 14 is an enlarged partially sectional view taken along line C-C ′ of FIG.
- the lateral movement guide rail 28 is fixed to the support frame 29 that connects the left and right rail receiving blocks 17 to each other.
- the rail receiving block 30 attached to the guide rail 28 is fixed to the rotary shaft 18 via support blocks 32 and 33.
- the rack 23 is fixed to the support frame 29 along the longitudinal direction of the support frame.
- the motor 10 is fixed by a motor support frame 34 to a support block 32 that penetrates and supports the rotary shaft 18.
- a pinion gear 12 is connected to the drive shaft of the motor 10, and the pinion gear 12 is engaged with the rack 23.
- the motor 10 rotates, the pinion gear 12 rotates, and the rack 23 is sent out, and the support frame 29 is sent out in conjunction with this.
- the rail receiving block 30 moves along the guide rail 28, whereby the support frame 29 and the rail receiving block 17, the support frames 32 and 33, and the rotary shaft 18 move relatively in the lateral direction.
- the upper frame 2 moves laterally.
- the load of the upper frame 2 indicated by the arrow in the figure is guided through the guide rail 3 and the rail receiving block 17 and the support frame 29, and the guide rail 28 and the rail receiver directly below. It is transmitted to the block 30 and further directly transmitted to the rotary shaft 18 via the support blocks 32 and 33.
- the lateral movement device By configuring the lateral movement device in this way, the lateral movement device can be configured with the minimum necessary members, and the support structure becomes robust, and the deformation of the support structure portion is reduced to improve the accuracy of the drive mechanism. Can be planned.
- the load support portions are interposed via intermediate frame-like support structures with different load application positions such as the multistage structure in the known example. Therefore, since the load can be directly transmitted directly to the structure portion directly below, the deformation of the support structure portion accompanying the up-and-down movement and the vertical movement can be reduced as much as possible.
- the length of the rotating shaft 18 can be shortened as compared with each of the above-described embodiments, the width of the lower structure portion (fixed side) of the lateral movement device can be further shortened to reduce the size of the device. .
- FIG. 15 is a partial cross-sectional enlarged view of a front view showing an alternative example of the mechanism shown in FIG.
- the height of the mechanism is slightly increased in the height direction.
- the height of the mechanism can also be reduced by means such as arranging two guide rails 28 and 28 and a rail receiving block 30 in parallel on the front and rear sides. By arranging the two guide rails 28 and 28 and the rail receiving blocks 30 and 30 in parallel, the upper load can be distributed and supported evenly, reducing the height of the mechanism, as in FIG. The load of the upper frame 2 can be directly supported.
- a lateral movement device is added without changing the minimum level height, and the subject is placed on the top 1.
- the subject can be moved in the lateral direction while being placed.
- the horizontal movement device can have a multi-stage structure (the height of the lifting device and the vertical movement device, the thickness of the horizontal movement device).
- the number of parts can be greatly reduced, the weight can be reduced, and the amount of deformation of the movable part and the intermediate support member can be reduced.
- the lateral movement device is provided at the rear portion of the upper frame 2, but the lateral movement device may be provided on the front side of the upper frame 2, that is, on the rail receiving block 15 and the rotating shaft 20. Further, in each of the above-described embodiments, one lateral movement device is provided on either the front or rear side. However, one lateral movement device may be provided on each of the front and rear sides, and a total of two lateral movement devices may be provided. Good.
- a punter arm is used as the arm portion 22.
- the upper frame is obtained by rotating the arm in parallel with a fixed block fixed to the base.
- the above-described embodiments may also be applied to a cobra arm type bed that moves up and down while moving 2 vertically. Since the cobra arm is a device that vertically moves the upper frame 2 according to the rotation angle of the arm, by applying the present invention to the cobra arm, the vertical movement device can be provided with a lateral movement device.
- the rail receiving block and the rotating shaft are relatively moved by using the lateral movement device.
- the upper connecting member including the rail receiving block and the rotating shaft, and the arm portion of the panta arm or the cobra arm. Can be moved laterally even if they are moved relative to each other.
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Abstract
Description
第一実施形態は、X線CT装置に本発明を適用した医用画像撮影装置用寝台(以下「寝台」という。)を用いた実施形態であり、寝台の昇降装置としてパンタアームを用い、パンタアームの構成部品を縦移動装置及び横移動装置として共用する。
図1に基づいてX線CT装置1の全体構成について説明する。図1は、X線CT装置の全体構成図である。図1のX線CT装置100は、X線管装置やX線検出器を搭載して被検体102の周囲を回転させ、被検体102を透過したX線を検出して透過X線信号を送信するガントリ101と、被検体102を天板上に載置してガントリ101の開口部101aへ搬送する寝台103と、操作者が入力した撮影条件に従って、X線CT装置100を制御し、X線撮影を行ったり、ガントリ101から送信された透過X線信号を受信して再構成画像を生成する画像処理部を備えた制御装置104と、画像処理部により生成された再構成画像を表示する表示装置105と、制御装置104に対して各種指示を入力するための操作装置106とを備える。寝台103は、本発明が適用された寝台であり、制御装置104は、寝台103の昇降動や横移動及び縦移動の制御、及び画像処理や入力操作の制御を行う。
次に図2乃至図5に基づいて、寝台103に備えられた昇降装置について説明する。図2は、第一実施形態に係る医用画像寝台装置用寝台の全体構成を示す正面図である。図3は、図2において上部フレームが縦移動し、上昇した状態を示す正面図である。図4は、図2に示した正面図をa方向から見た上部フレームが下降したときの側面図である。図5は、図4において上部フレームが上昇し、ガントリを正面に見て左方向へ移動した状態を示す側面図である。
レール受けブロック15には、モータ9がモータ支持フレーム35により固定される。モータ9の駆動軸には、ピニオンギア11が備えられる。また、上部フレーム2下面前側には、案内レール3に沿って、ピニオンギア11と螺合するラック13が備えられる。モータ9が回転すると、ピニオンギア11とラック13とが螺合し、ピニオンギア11の回転運動がラック13に沿った直線運動に変換される。そして、モータ9とレール受けブロック15(及びそれに連動してレール受けブロック17)が案内レール3に沿ってスライドし、レール受けブロック15及びレール受けブロック17(及び基台8)に対し、上部フレーム2が相対的に移動する(矢印HL1方向)。これらにより、上部フレーム2に載置された天板1が開口部101aに向う方向(以下、本実施形態で「縦方向」という)への移動を行う縦移動装置が構成される。
次に、図6から図9に基づいて横移動装置について説明する。図6は、図2に示した正面図をb方向から見た上部フレームが下降したときの側面図である。図7は、図6において上部フレームが上昇し、ガントリを正面に見て右方向へ移動した状態を示す側面図である。図8は、横移動装置の要部を示す側面図の一部拡大図である。図9は、図8のA-A’における一断面拡大図である。
次に本実施形態に係る寝台103の動作について説明する。昇降装置、横移動装置、縦移動装置は、制御装置104からの制御信号に従って油圧シリンダ7、モータ9、モータ10が制御されて以下の各動作を実行する。
第二実施形態は、第一実施形態の横移動装置の一代替例に係る横移動装置である。以下図10、図11に基づいて、第二実施形態に係る横移動装置について説明する。図10は、第二実施形態に係る横移動装置の側面図であり、図11は、図10のB-B’における一断面拡大図である。
以下、図12に基づいて第三実施形態に係る横移動装置について説明する。図12は、第三実施形態に係る横移動装置を示す側面図の一部拡大図である。第三実施形態に係る横移動装置は、パンタアーム40の回転軸18と、上部フレーム2の下面に備えられたレール受けブロック17とを横方向に沿った案内レール28を介して連結した横移動装置である。この横移動装置では、昇降装置を構成する回転軸18と、昇降装置及び縦移動装置を構成するレール受けブロック17とを、横移動装置の部品として共用する。第一、第二実施形態では、レール受けブロックは回転軸受としての機能を有していたが、第三実施形態ではレール受けブロックは回転軸受としては機能せず、代わりに、回転軸18に対して外側フレーム5が回転する。また、第一、第二実施形態では、回転軸18とレール受けブロック17とは直接的に連結されるが、本実施形態では、回転軸18とレール受けブロック17とは、後述する横方向案内レールを介して間接的に連結される。
第四実施形態は、案内レールを使用した横移動装置の別態様に相当する横移動装置であって、第三実施形態(図12)における案内レールとレール受けブロックが上下逆の配置となる横移動装置である。なお、第一、第二実施形態では、回転軸18とレール受けブロック17とは直接的に連結されるが、本実施形態では、回転軸18とレール受けブロック17とは、後述する横方向案内レールと横方向レール受けブロックと支持ブロックとを介して間接的に連結される。
Claims (11)
- 基台と、
天板を支持する上部フレームと、
前記基台と前記上部フレームとの間に位置し、前記上部フレームを昇降動させる昇降装置と、を備え、
前記昇降装置は、その昇降装置を構成する少なくとも二部材を前記天板の天板面内において前記上部フレームの長手方向と直交する方向である横方向に沿って相対移動させる横移動装置を備える、
ことを特徴とする医用画像撮影装置用寝台。 - 前記横移動装置は、前記昇降装置の上端部に備えられる、
ことを特徴とする請求項1に記載の医用画像撮影装置用寝台。 - 前記昇降装置は、
前記基台に対する垂直方向の高さが可変であるアーム部と、
前記アーム部の上端部を、前記上部フレームに接続する上部接続部と、
前記アーム部の下端部を、前記基台に接続する下部接続部と、を備え、
前記横移動装置は、前記上部接続部を構成する少なくとも二つの部材を前記横方向に沿って相対移動させる、又は前記上部接続部と前記アーム部とを前記横方向に沿って相対移動させる駆動機構を備える、
ことを特徴とする請求項2に記載の医用画像撮影装置用寝台。 - 前記上部接続部は、前記上部フレームの下面に固定された前記長手方向に沿った移動を規制する案内レールと、前記案内レールに沿って前記長手方向に移動するレール受けブロックと、前記レール受けブロックと前記アーム部の上端部とを連結する回転軸と、を備え、
前記横移動装置の駆動機構は、前記レール受けブロックと前記回転軸とを前記横方向に沿って相対移動させる、
ことを特徴とする請求項3に記載の医用画像撮影装置用寝台。 - 前記上部接続部は、前記上部フレームの下面に少なくとも二つの前記案内レール及び前記レール受けブロックを備え、
前記駆動機構は、少なくとも二つの前記レール受けブロックを連結する横方向ラックと、前記回転軸に固定された横駆動装置と、前記横駆動装置の駆動軸に連結されて回転し、前記横方向ラックにかみ合わされた第一ピニオンギアと、を備える、
ことを特徴とする請求項4に記載の医用画像撮影装置用寝台。 - 前記上部接続部は、前記上部フレームの下面に少なくとも二つの前記案内レール及び前記レール受けブロックを備え、
前記レール受けブロックのそれぞれには、前記回転軸を挿入する貫通孔を備え、
前記駆動機構は、前記回転軸を構成するボールネジと、前記貫通孔の内面に備えられた前記ボールネジと螺合するネジ溝と、前記アーム部に固定された横駆動装置と、前記横駆動装置の駆動軸に連結された第一プーリと、前記ボールネジに備えられた第二プーリと、前記第一プーリと前記第二プーリとを連結し、前記横駆動装置の駆動力を伝達するタイミングベルトと、を備える、
ことを特徴とする請求項4に記載の医用画像撮影装置用寝台。 - 前記上部接続部は、前記上部フレームの下面に少なくとも二つの前記案内レール及び前記レール受けブロックを備え、
前記横移動装置は、前記回転軸と前記レール受けブロックとの間に、前記レール受けブロックの前記横方向に沿った移動を規制する横方向案内レールを備え、
前記駆動機構は、前記少なくとも二つのレール受けブロックを連結する横方向ラックと、前記回転軸に固定された横駆動装置と、前記横駆動装置の駆動軸に回転可能に連結され、前記横方向ラックにかみ合わされた第一ピニオンギアと、を備える、
ことを特徴とする請求項4に記載の医用画像撮影装置用寝台。 - 前記上部接続部は、前記上部フレームの下面に少なくとも二つの前記案内レール及び前記レール受けブロックを備え、
前記横移動装置は、前記少なくとも二つのレール受けブロックを連結する支持部材と、前記支持部材に備えられ、前記横方向に沿った移動を規制する横方向案内レールを備え、 前記駆動機構は、前記支持部材に前記横方向に沿って備えられた横方向ラックと、前記回転軸に固定され、前記横方向案内レールに沿って移動する横方向レール受けブロックと、前記横方向レール受けブロックに固定された横駆動装置と、前記横駆動装置の駆動軸に連結され、前記横方向ラックにかみ合わされた第一ピニオンギアと、を備える、
ことを特徴とする請求項4に記載の医用画像撮影装置用寝台。 - 前記昇降装置は、前記上部フレームを、前記基台に対し前記上部フレームの長手方向に沿って相対移動させる縦移動装置を更に備える、
ことを特徴とする請求項1に記載の医用画像撮影装置用寝台。 - 前記アーム部は、第一アームと第二アームとを略X字状に交叉させ、その交叉する部位をセンターピンにより回転可能に連結して、前記長手方向に沿って広狭するパンタアームであり、
前記上部接続部は、前記案内レールと、その案内レールに沿って移動する二つの前記レール受けブロックと、各レール受けブロックと前記第一アームの上端部及び前記第二アームの上端部とを接続する二つの前記回転軸と、を備え、
前記昇降装置は、前記上部フレームを、前記基台に対し前記上部フレームの長手方向に沿って相対移動させる縦移動装置を更に備え、その縦移動装置は、前記長手方向に沿って前記案内レールに備えられた縦方向ラックと、二つの前記レール受けブロックの一方に備えられた縦駆動装置と、その縦駆動装置の駆動軸に回転可能に連結され、前記縦方向ラックにかみ合わされた第二ピニオンギアとを備える、
ことを特徴とする請求項4に記載の医用画像撮影装置用寝台。 - 基台と、
天板を支持する上部フレームと、
前記基台と前記上部フレームとの間に位置し、前記上部フレームをその長手方向に沿って移動させる縦移動装置と、備え、
前記縦移動装置は、その縦移動装置を構成する少なくとも一部材を、前記基台に対して前記上部フレームの長手方向に前記天板の天板面内において直交する方向である横方向に沿って相対移動させる横移動装置を備える、
ことを特徴とする医用画像撮影装置用寝台。
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Also Published As
Publication number | Publication date |
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CN102413768A (zh) | 2012-04-11 |
US8578529B2 (en) | 2013-11-12 |
US20120023671A1 (en) | 2012-02-02 |
JP5670317B2 (ja) | 2015-02-18 |
CN102413768B (zh) | 2014-05-14 |
JPWO2010123024A1 (ja) | 2012-10-25 |
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