JP2002011003A - X-ray diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray diagnostic device with a safe system preventing an X-ray tube, a ceiling plate, an imager or the like from falling down even when a transmission system, transmitting motive force from a motor which elevates X-ray tube, ceiling plate, imager and the like, is broken. SOLUTION: The motive force of a motor 8 mounted on a work 7 is transmitted to a nut 2 of a ball screw inserted to a bearing 5 through a belt 3 of a motive force transmission system, and the work elevates along a screwed rod 1. A friction plate 12 is mounted coaxially with the nut 2, and a supply voltage of a suction coil 13 fixed to the work 7, is cut according to the signal from a belt breakage detection sensor 4, and a plate 11 applies the breaks to the nut 2 through a guide 14, and stops the coaxial nut 2, and the work is prevented from falling down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus, and more particularly, to a mechanism for preventing a heavy object such as an X-ray tube, an image pickup apparatus, and a top plate from moving down.

[0002]

2. Description of the Related Art An X-ray diagnostic apparatus includes a cardiovascular diagnostic apparatus for injecting a contrast agent into blood vessels of a subject and observing and diagnosing a blood flow with an X-ray transmission image. There are gastrointestinal diagnostic devices that give a drink and perform an inspection while following the flow of a contrast agent in the digestive tract (esophagus and gastrointestinal tract). In the above X-ray diagnostic apparatus, an X-ray tube, an imaging device (an image intensifier, a TV camera, an imaging device, etc.) are arranged opposite to the top plate, and the X-ray tube and the imaging device are interlocked. Or, alone, the image is moved up, down, left, right, front and back, or rotated to perform fluoroscopic imaging.
Gastrointestinal diagnostic apparatuses include a proximity operation-type fluoroscopy table and a remote operation-type fluoroscopy table. The close-up operation type fluoroscopy table sandwiches a top plate on which a subject is to be placed, and an X-ray tube that is disposed opposite to the back side of the top plate and an imaging device (image-in) that is disposed in front of (above) the top plate. (A tensifier, a TV camera, and an operation panel) are integrally linked via a support. An operator operates an operation handle and a switch provided on an operation panel on the front side of the imaging device to move the imaging device back and forth, and move the top plate up and down and left and right by a motor. On the other hand, FIG. 5 shows a remotely operated fluoroscopic imaging table. The fluoroscopy table sandwiches a top plate 22 on which a subject is placed, and is opposed to the top plate 2.
An X-ray tube 18 is disposed in front of (upper part of) the imaging device 2, and an imaging device 23 (image intensifier, T
A V-camera, a photographing device) is arranged via a support portion, and an operator operates an operation handle of a controller (not shown) in a separate room to move the X-ray tube 18 with the collimator 19 to the support 21. Moving the X-ray tube 18 to the position where the imaging device 23 has moved, moving the imaging device 23 in the longitudinal direction behind the top 22, Further, the fluoroscopic table can be turned upside down about the rotation axis 20. On the other hand, the top plate 22 is independent of the rotation of the fluoroscopic table, the movement of the X-ray tube 18 and the imaging device 23, and is operated in accordance with a switch operation of a controller in a separate room. Can be moved by a motor. As described above, the X-ray tube 18, the imaging device 23, and the top plate 22 sandwich the subject while rotating the fluoroscopic table upside down and observing the shadow of the contrast agent of the subject on the monitor. Can be moved relatively independently, and the region of interest of the subject can be positioned at the center of the imaging device 23.

[0003]

A conventional X-ray diagnostic apparatus is constructed as described above, and comprises an X-ray tube 18, an imaging device 2,
3. The top plate 22 on which the subject is placed is a heavy object, and a ball screw and a nut are used for these lifting mechanisms. FIG. 6 shows the lifting mechanism. A motor 8 is attached to a work 7 to be moved up and down (to which an X-ray tube 18, an imaging device 23, a top plate 22 and the like are attached), and its driving force is transmitted to a nut 2 of a ball screw via a belt 3.
The nut 2 is fitted into a bearing 5 attached to the work 7, and when the nut 2 rotates, the nut 2 rotates around the screw rod 1 via the ball of the inner ring, and the screw rod 1 is fixed. Move up and down along the linear motion guides 6 provided on both sides. A ball screw replaces sliding contact with rolling contact. A number of steel balls are arranged between a screw rod 1 and a nut 2 that have a specially shaped groove, and both balls are like a male screw and a female screw. As a result, when the nut 2 is rotated, it is moved forward or backward by one pitch per rotation, like a normal screw, and a conversion from a rotary motion to a linear motion is performed. With the rotation of the screw rod 1 or the nut 2, the groove of the male screw or the groove of the female screw makes rolling contact with each steel ball. The steel balls arranged endlessly circulate in one closed circuit, and the connection between the screw rod 1 and the nut 2 is not interrupted. For this reason, the ball screw has very good transmission efficiency (90% or more), but cannot perform automatic drawing (self-locking). Therefore, when an automatic iris is required, a ratchet device and a brake device are required. Therefore, in order to prevent the work 7 from dropping, conventionally, the brake 9 was attached to the shaft of the motor 8, and after the motor 8 was stopped, the brake 9 was operated to hold the work 7. However, although the belt 3 is used in FIG. 4 as a power transmission mechanism between the motor 8 and the nut 2, if the belt 3 breaks, the nut 2 starts rotating with respect to the threaded rod 1, and as a result, However, there is a problem that the work 7 falls.

The present invention has been made in view of such circumstances, and a power transmission mechanism from a motor for moving a heavy object such as an X-ray tube, a top plate, an imaging device, etc., to a ball screw is broken. An object of the present invention is to provide an X-ray diagnostic apparatus provided with a safe mechanism so that a heavy object does not fall even in the case of doing.

[0005]

In order to achieve the above object, an X-ray diagnostic apparatus according to the present invention uses a combination of a ball screw and a nut and has a mechanism for moving a workpiece up and down. When moving the work up and down by fixing the rod and rotating the nut, with the brake provided coaxially with the nut, or when moving the work up and down by fixing the nut and rotating the screw rod, A brake provided coaxially with the threaded rod, abnormality detecting means for detecting an abnormality in power transmission means to the threaded rod or the nut, and a circuit for operating the brake by a signal from the abnormality detecting means It is.

The X-ray diagnostic apparatus of the present invention is configured as described above, and brakes a work on which an X-ray tube, an imaging device, a top plate, and the like are mounted, in a coaxial rotation of a ball screw or a nut of an elevating mechanism for elevating the work. A mechanism is provided, and a power transmission mechanism for transmitting power from a motor is provided with an abnormality detecting means, and a circuit for operating the brake mechanism based on a signal thereof is provided. The work can be stopped by the brake to prevent the work from falling.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the X-ray diagnostic apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a view showing an elevating mechanism for elevating and moving a work 7 holding a heavy object such as an X-ray tube 18, a top plate 22, and an imaging device 23 of the X-ray diagnostic apparatus of the present invention. The lifting mechanism of the X-ray diagnostic apparatus includes an X-ray tube 18,
A work 7 for holding a heavy object such as the top plate 22 and the imaging device 23 and moving up and down along the linear motion guides 6 provided on both sides;
A motor 8 with a brake 9 mounted on the work 7, a belt 3 of power transmission means for transmitting the power of a drive shaft of the motor 8 to a nut 2 of a ball screw, and detecting that the belt 3 is broken. A sensor 4 for detecting a belt rupture as an abnormality detecting means, a ball screw portion including a nut 2 and a screw rod 1, a bearing 5 into which the nut 2 is inserted and attached to a work 7, and a friction plate 12 coaxially connected to the nut 2 And a suction coil 13 provided above the friction plate 12 and operated by receiving a signal from the belt rupture detection sensor 4, and a plate 11 sucked by the suction coil along a guide 14.

[0008] The lifting mechanism of the work 7 of the X-ray diagnostic apparatus is as follows.
Functionally, it includes a motor drive unit, a power transmission mechanism, a ball screw unit, and a brake unit. The motor drive unit includes a motor 9 and a brake 9 that is provided coaxially and operates when the operation is OFF. The power transmission mechanism includes a belt 3 having a function of transmitting the power of the drive shaft of the motor 8 to the nut 2 of the ball screw, and a belt rupture detection sensor 4 as an abnormality detecting means for detecting an abnormality when the belt 3 ruptures. And As shown in FIG. 3, the sensor 4 for detecting the breakage of the belt as the abnormality detecting means is provided with, for example, a transmission type optical sensor including a light emitting unit and a light receiving unit at a position where the belt 3 runs, and transmitting power by the output thereof. Detects an abnormality in the mechanism. The ball screw portion is a ball screw mechanism in which the screw rod 1 is fixed to the device and the nut 2 rotates. Generally, a ball screw mechanism has very good transmission efficiency (90%).
As described above, automatic squeezing (self-locking) cannot be performed. The brake unit includes a friction plate 12 coaxially connected to the nut 2, and a suction coil 13 provided on a work 7 that operates upon receiving a signal from the belt rupture detection sensor 4.
Is attracted when a voltage is applied to the attracting coil 13,
And a plate 11 for releasing the brake along the guide 14. The function of the negative operation brake 10 is provided.
The negative operation brake 10 has a mechanism for generating a friction torque by shutting off the power supply.
A voltage is applied to the suction coil 13, and the brake is released. However, when the belt 3 of the power transmission mechanism breaks,
Upon receiving a signal from the belt rupture detection sensor 4, the supply voltage of the suction coil 13 is turned off, the plate 11 descends along the guide 14, and the friction plate 12 is braked.
Since the friction plate 12 is connected to the nut 2, the rotation of the nut 2 stops, and the work stops falling.

In the above embodiment, the work 7 is raised and lowered by fixing the screw rod 1 and rotating the nut 2.
FIG. 2 shows an embodiment of a mechanism for raising and lowering the work 7 by fixing the nut 2 and rotating the screw rod 1. The lifting mechanism of the X-ray diagnostic apparatus according to the present invention includes an X-ray tube 18, a top plate 2.
2. A work 7 that holds a heavy object such as the image pickup device 23 and moves up and down along a linear motion guide 6 provided on both sides, and a motor 8 with a brake 9 attached to a fixed portion of a fluoroscopic imaging table.
A belt 3 of power transmission means for transmitting the power of the drive shaft of the motor 8 to the threaded rod 1 of the ball screw;
The sensor 4 for detecting the breakage of the belt as a failure detecting means for detecting the breakage, a ball screw portion composed of a fixing nut 2 and a rotating screw bar 1, and a fixing portion of a fluoroscopic imaging stand into which both ends of the rotating screw bar 1 are inserted. Mounted bearing 5 and rotating screw rod 1
, A suction coil 13 provided above the friction plate 12 and operated by receiving a signal from the belt rupture detection sensor 4, and a plate sucked by the suction coil along a guide 14. And 11. In the embodiment shown in FIG. 1, a brake is applied by a friction plate 12 coaxially connected to the nut 2 in response to a signal from a belt rupture detection sensor 4 of abnormality detection means for detecting that the belt 3 has been ruptured. On the other hand, in the embodiment of FIG. 2, the brake is applied by the friction plate 12 coaxially connected to the rotary screw bar 1.

FIG. 4 shows another embodiment of the lifting mechanism of the X-ray diagnostic apparatus. The lifting mechanism of the X-ray diagnostic apparatus is shown in FIG.
And the mechanism of the brake unit are different. Others have the same configuration and perform the same operation.

The brake unit includes a gear 15 coaxially connected to the nut 2 of the ball screw, and a gear 16 meshing therewith.
And a brake 17 connected to the shaft of the gear 16. The brake 17 may have the same mechanism as the brake 9 attached to the motor 8. That is, when the work 7 is raised and lowered in a normal state, the voltage of the electromagnetic coil of the brake 17 is turned on, and the brake is released. However, when the belt 3 of the power transmission mechanism breaks, the signal from the belt break detection sensor 4 is received, the voltage of the electromagnetic coil of the brake 17 is turned off, and the brake is applied. This method may be used when the brake unit cannot be coaxially arranged with respect to the nut 2.

Next, the operation of the elevating mechanism of the X-ray diagnostic apparatus, such as the X-ray tube 18, the top plate 22, and the imaging device 23, is shown in FIG.
This will be described with reference to FIG. First, the fluoroscopy table is turned upside down and the subject is placed on the tabletop 22. Then, X-ray fluoroscopy is performed in advance. At this time, the X-ray tube 18 and the imaging device 23 are moved up and down, the top plate 22 is moved up and down and left and right, and in some cases, the X-ray tube 18 is brought closer to the subject to diagnose the subject. The operator operates the operating handle so that the part is centered while observing the X-ray fluoroscopic image on the monitor of the controller. Once the X-ray is turned off, the subject is allowed to include the contrast agent in his mouth. Returning to the operation panel side of the controller in the separate room again, X-rays are emitted, and the subject is instructed to swallow the contrast agent. Observe and photograph the contrast agent flowing in the gastrointestinal tract and flowing to the relief of the inner wall on the monitor. Then, the fluoroscopic imaging table is further rotated in the horizontal direction, and the abdomen is compressed using a compression tube or the like, so that the image is taken so that the inner wall can be clearly seen. Then, the fluoroscopy table is again turned upside down, the top plate 22 is moved right and left and back and forth, the X-ray tube 18 and the imaging device 23 are moved, and the subject is instructed to be in a horizontal position. Then, an image of the diagnostic site is taken. As described above, the movement of the X-ray tube 18 and the imaging device 23, the back and forth movement of the X-ray tube 18, and the up, down, left and right movements of the table 22 on which the subject is placed are performed using the lifting mechanism of the ball screw. . During a normal operation, the brake 9 provided on the motor 8 operates, and the X-ray tube 18, the imaging device 23, and the top 22 stop. And
If there is an abnormality in the power transmission mechanism from the motor 8 during operation or when the motor 8 is stopped, the power transmission mechanism is provided coaxially with the rotating portion of the ball screw upon receiving a signal from abnormality detection means provided in the power transmission mechanism. The X-ray tube 18 and the imaging device 2 which are locked by the brake mechanism and held by the work 7
3. The top plate 22 stops in a safe state without falling.

[0013]

The X-ray diagnostic apparatus of the present invention is constructed as described above, and uses the power from the motor for lifting and lowering the work on which the X-ray tube, the imaging device, the top plate, etc. are mounted, and the rotating part of the ball screw. The power transmission means for transmitting to the power transmission means is provided with detection means for detecting an abnormality, and the signal is used to operate the brake mechanism mounted coaxially with the rotation of the ball screw.
Even if an abnormality occurs in the power transmission means, the power transmission means is stopped by the brake, the work can be prevented from dropping, and the device can be operated safely. And since a brake mechanism is arrange | positioned coaxially with the rotating part of a ball screw, the number of component parts can be reduced. Also, since there is no extra transmission means between the rotating part of the ball screw and the brake part, the moment of inertia of the rotating system can be reduced, and as a result, the vertical movement speed and position of the work can be controlled with high accuracy.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of an X-ray diagnostic apparatus of the present invention.

FIG. 2 is a diagram showing an embodiment of a screw rod rotation system of the X-ray diagnostic apparatus of the present invention.

FIG. 3 is a view showing a structure of a position of a sensor for detecting a belt breakage of the X-ray diagnostic apparatus of the present invention.

FIG. 4 is a diagram showing another embodiment of the X-ray diagnostic apparatus of the present invention.

FIG. 5 is a diagram for explaining a part that performs a vertical movement operation of each part of the X-ray diagnostic apparatus.

FIG. 6 is a view showing a vertically moving mechanism of a conventional X-ray diagnostic apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Screw rod 2 ... Nut 3 ... Belt 4 ... Belt break detection sensor 5 ... Bearing 6 ... Linear motion guide 7 ... Work 8 ... Motor 9 ... Brake 10 ... Negative operation brake 11 ... Plate 12 ... Friction plate 13 ... Suction coil 14 Guide 15 Gear 16 Gear 17 Brake 18 X-ray tube 19 Collimator 20 Rotating shaft 21 Column 22 Top plate 23 Imaging device 24 Base

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Yoshida, inventor, Shimadzu Corporation, Nishinokyo Kuwahara-cho, Nakagyo-ku, Kyoto (72) Inventor Tadahiko Nakahara, Shimadzu Corporation, Shizuzu, Nishi-no-Kyowacho, Nakagyo-ku, Kyoto, Japan (72) 72) Inventor Takayasu Masayasu 1 in Nishi-no-Kyowa-cho, Nakagyo-ku, Kyoto, Shimazu Works, Ltd. (72) Inventor Takayoshi Okamura 1 in Nishi-no-Kyowabara-cho, Nakagyo-ku, Kyoto Co., Ltd. ▲ Taku ▼ Jin 1 Kuwabaracho, Nishinokyo, Nakagyo-ku, Kyoto, Japan Inside Shimadzu Corporation (72) Inventor Shojiro Yamaguchi 1 Kuwaharacho, Nishinokyo-ku, Kyoto, Japan F-term inside Shimadzu Corporation 3J058 AA43 AA47 AA53 AA68 AA78 AA88 BA60 BA80 CC13 CC72 CC77 CD24 DB29 FA50 4C093 AA01 CA33 EC13 EC52 EC58 ED04

Claims (1)

[Claims] In an X-ray diagnostic apparatus having a mechanism for moving a work up and down using a combination of a ball screw and a nut, when the work is moved up and down by rotating a nut by fixing a screw rod, the nut and the nut are moved. When moving the work vertically by fixing the nut and rotating the screw rod with the brake provided coaxially,
A brake provided coaxially with the screw rod, abnormality detection means for detecting an abnormality of power transmission means to the screw rod or the nut, and a circuit for operating the brake by a signal from the abnormality detection means. An X-ray diagnostic apparatus comprising: