JP4491212B2 - X-ray fluoroscopic equipment - Google Patents

Description

  The present invention relates to an X-ray fluoroscopic apparatus, and more particularly to a C-arm type X-ray fluoroscopic apparatus in which an X-ray tube apparatus is disposed at one end of a C arm and an image system apparatus is disposed at the other end.

  In the C-arm X-ray fluoroscopic apparatus, while performing fluoroscopy with X-rays, the catheter is inserted into the subject and delicate operations are repeated to examine and treat the subject's digestive system and circulatory system. Is called. In this IVR technique, it is important that the operator can perform the treatment in a good posture and that there is a necessary and sufficient working space in addition to the real-time display of the image.

For real-time display of images, a video system that combines an X-ray image intensifier with a TV camera (hereinafter referred to as II-TV camera system) has been put to practical use. The intensifier has a cylindrical shape and its height is high, so it takes a lot of space, and the inner wall is heavy because lead is used to prevent X-ray leakage. Therefore, in recent years, a two-dimensional flat panel detector has begun to be used as a video system device (for example, Patent Document 1).
Japanese Patent Laid-Open No. 2001-95790

  In the prior art described in Patent Document 1 above, in an X-ray fluoroscopic apparatus configured to mount an X-ray tube and an imaging system facing each other at the tip of the C arm, the imaging system can be moved in the same direction as the X-ray radiation axis Means (slide mechanism and mounting plate) are provided.

  The present inventor has found the following problems as a result of studying the above prior art. That is, in the prior art described in Patent Document 1, as shown in FIG. 1 of Patent Document 1, the slide mechanism and the mounting plate protrude from the arc outward in the radial direction of the semicircular C-arm. In this case, there is no problem when the C-arm X-ray fluoroscope is installed in a room with a high ceiling, but when it is installed in a room with a low ceiling, the X-ray tube is connected to the back of the table. The slide mechanism and the mounting plate hit the ceiling, and when the overtube (when the imaging system is positioned on the back of the table), the slide mechanism and the mounting plate are on the floor. There is a problem of hitting. In order to avoid this, it is necessary to set the position of the table on which the subject is placed high. When the height of the table becomes high, there are problems that the subject gets on and off the table and the physical burden on the surgeon during IVR increases.

  An object of the present invention is to provide a C-arm X-ray fluoroscopic imaging apparatus that can be installed even in a room with a low ceiling, and that allows an imaging system to approach or retract from a subject. is there.

According to the first feature of the present invention, a table for placing a subject, X-ray irradiation means for irradiating the subject placed on the table with X-rays, and for the X-ray irradiation means, An X-ray transmission image detection unit that is disposed opposite to each other with the subject interposed therebetween and detects an X-ray transmission image that has passed through the subject, and is connected to the X-ray transmission image detection unit, and the X-ray transmission image detection unit An X-ray irradiation direction moving means for moving the X-ray irradiation direction, a support means comprising a substantially semicircular C-arm for connecting and supporting the X-ray irradiation means and the X-ray transmission image detection means, An X-ray fluoroscopic apparatus comprising: display means for performing image processing based on an X-ray transmitted image obtained by the X-ray transmitted image detection means and displaying an X-ray fluoroscopic image. Is a plurality of outer struts, middle struts and inner struts with different cross-sectional sizes A pulley, a belt or a sprocket, and a chain connected to the middle strut, arranged on both sides of the middle strut, and moved in conjunction with the pulley, the belt, or the sprocket and the chain, and the rack of the inner strut and the outer A pinion that is in contact with a rack of columns, and a motor that drives the pulley and belt or the sprocket and chain, and the motor drives the middle column and the inner column with respect to the outer column. An X-ray fluoroscopic apparatus characterized by the above is provided.

According to a second aspect of the present invention, there is provided an X-ray fluoroscopic apparatus in which the rack of the inner column receives the rotation of the pinion and moves relative to the rack of the outer column .

  According to the present invention, it is possible to provide a C-arm type X-ray fluoroscopic imaging apparatus that can be installed even in a room with a low ceiling and can make an imaging system approach or retreat with respect to a subject. It becomes possible.

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
FIG. 1 shows an external view of a C-arm type X-ray fluoroscopic apparatus according to the first embodiment of the present invention. However, FIG. 1 shows a case where an X-ray flat panel detector (hereinafter abbreviated as FPD (Flat Panel Detector)) is used as an imaging system device, and FIG. 1 shows C from the side of a patient table on which a subject is placed. FIG. 1 (a) shows an undertube, and FIG. 1 (b) shows an overtube.

  As shown in Fig. 1, the C-arm fluoroscopy system equipped with FPD holds C-arm 1 and C-arm 1 from below the center of C-arm 1 and rotates C-arm 1 in the A direction. The C-arm support 2 for enabling, the semi-circular C-arm 1 is arranged at the approximate center, the table 3 for placing the subject, and provided at one end of the C-arm 1, An X-ray tube 4 that irradiates X-rays in the direction in which it is placed, and a diaphragm device that is installed on the side of the subject where the subject is placed in the X-ray tube 4 and restricts the direction of X-ray irradiation to the subject 5 and FPD6, which is installed at the other end of C-arm 1 through an FPD front-rear drive unit (to be described later) and detects the X-ray image obtained through the subject, and FPD6 in the direction of the subject It is arranged so that one end of C arm 1 and FPD6 are connected to each other so that it can be moved close to or in close contact with the subject and moved in the opposite direction to the subject. F.P.D. formed by and a rear driving unit 7.

  In the C-arm type fluoroscopic apparatus equipped with F.P.D. configured as described above, the F.P.D.front-and-rear drive unit 7 is provided at a position where one end of the C-arm 1 and F.P.D.6 are connected. The F.P.D. front / rear drive unit 7 is provided so as to be located on the inner side of the outer arc of the C arm 1. Since the F.P.D. back-and-forth drive unit 7 has a telescopic arm 7 'built in, the F.P.D.6 can be moved freely toward and away from the subject. Therefore, as shown in Fig. 1 (a), when the FPD6 is moved directly above the subject, the FPD6 can be brought into contact with the subject as in the position 6 'to prevent enlargement blur. Retracting can secure the space around the subject and the table, so side view can be performed at the 6 ”position. Also, rotate the FPD6 to the opposite side of the table 3 as shown in Fig. 1 (b). In this case, since the FPD front / rear drive unit 7 does not protrude from the outer arc of the C arm 1, the isocenter of the C arm 1 can be lowered, so that the position of the table 3 can also be lowered (height H (a).) This makes it easier for the subject to get on and off the table, and for the operator to expand the work space, making it easier to work, as shown in Fig. 1 (c). Lower than when II-TV camera system is used for video system (H (b)) (H (a) <H (b)) However, in FIG.1 (c), 11 is an X-ray image intensifier, 12 is an X-ray image intensifier front-back drive part.

  Next, FIG. 2 shows a schematic diagram of the configuration of the telescopic arm 7 ′ built in the F.P.D. back-and-forth motion drive unit 7 for moving the F.P.D.6 back and forth. FIG. 2 (a) shows the state when fully contracted, FIG. 2 (b) shows the state when fully extended, and the left side is an overall view of the telescopic arm, and the right side is a CC cross-sectional view of the telescopic arm. The telescopic arm 7 ′ built in the F.P.D. back-and-forth motion drive unit 7 is mainly composed of an outer strut 17 connected to the C arm 1, an intermediate strut 18, and an inner strut 19. The front end of the inner column 19 is connected to F.P.D.6 via the slide moving unit 8. Further, 21 is fixed to the middle support 18, and a pulley and a belt or a sprocket and a chain for moving a pinion to be described later, and 22 a and 22 b are a pinion that is moved by a pulley and a belt or a sprocket and a chain 21. , 22a is in contact with the rack 17 '(not shown) of the outer column 17, 22b is in contact with the rack 19' (not shown) of the inner column 19, and 23 is a pulley and belt or sprocket. And a motor for driving the chain 21. The pulley, belt or sprocket, chain 21, and motor 23 are connected by a shaft coupling coupling, and a speed reducer (not shown) is combined according to the required torque. 22a and 22b can use friction such as rubber rings in addition to the pinion. In this case, friction plates are used as 17 ′ and 19 ′ (not shown) that support and move the outer column 17 and the inner column 19.

  By rotating the motor 23, the pulley, the belt or the sprocket, the chain 21, and the pinion (22a, 22b) rotate in conjunction with each other, and the rack 17 ′ (not shown) of the outer column 17 fixed to the C arm 1 is not shown. 2), the middle strut 18 moves by a length of 1 in the direction of the downward arrow in FIG. Similarly, the rack 19 ′ (not shown) of the inner column 19 is rotated by a pinion (22a, 22b) and has a length of 2l in the direction of the downward arrow with respect to the rack 17 ′ (not shown) of the outer column 17. Just move. In this way, the motor 23 is connected to the pulley and belt or sprocket and chain 21 connected to the middle strut 18, and two pinions (22a and 22b) are arranged at both ends so that the motor 23 can be connected to the outer strut 17 with one motor. It is possible to drive and control the two struts, the middle strut 18 and the inner strut 19. That is, the middle strut 18 and the inner strut 19 move in the direction of the downward arrow in FIG. If the amount of movement of the middle column 18 relative to the outer column 17 is “1”, the amount of movement of the inner column 19 relative to the middle column 14 is also “1”, and the total amount of movement of the inner column 19 relative to the outer column 17 is “2”. Therefore, the dimension of the telescopic arm at the maximum extension can be made about three times the length L of the outer support column 17. Since the FPD 6 is thin and lightweight, according to the present embodiment, the FPD longitudinal movement drive unit 7 has a long stroke for the forward and backward movement of the FPD 6 as described above. It is possible to fit within the radius of the arm 1.

  Next, FIG. 3 shows an external view of a C-arm type X-ray fluoroscopic apparatus according to the second embodiment of the present invention. However, Figure 3 shows a C-arm fluoroscopy system equipped with an FPD as viewed from the right hand side of the subject on the table (Figure 3 (a) is under tube, Figure 3 (b) is over tube. ). According to the C-arm type X-ray fluoroscopic apparatus equipped with the FPD having the configuration shown in FIG. 3, the slide moving unit 8 is provided on the back surface of the FPD 6, so that the C-arm 1 is shown in FIGS. 1 (a) and (b). 1 (a), the position of the FPD 6 is moved by the slide moving unit 8 when the FPD 6 hits the subject in FIG. 1 (a) and the FPD 6 hits the table 3 in FIG. 1 (b). Can be slid. Therefore, after the slide, the C-arm 1 can be tilted in the A direction one more time, and photographing from an angle larger than the conventional one (for example, towne photographing) can be performed.

  Next, FIG. 4 shows a specific example (enlarged view) of the slide moving unit 8 shown in FIG. As shown in FIG. 4, the slide moving unit 8 includes a motor 24, pulleys 25a and 25b that are rotationally driven by the motor 24, a belt 26 that connects the pulleys 25a and 25b, and a male screw that rotates in conjunction with the pulley 25b. 26, a female screw 27 fitted to the male screw 26, a bearing 28, and the like. The FPD 6 is moved left and right by rotation driven by the motor 24 to the pulley 25a, from the pulley 25a to the belt 26, from the belt 26 to the pulley 25b, from the pulley 25b to the male screw 27, and from the male screw 27 to the female screw 28. And the female screw 28 moves left and right. Further, contact detectors 29 are installed at both ends of F.P.D.6, thereby detecting whether F.P.D.6 is in contact with the subject or table 3. By detecting this contact, the movement of F.P.D.6 by the motor 24 is performed in an appropriate direction. By combining the first embodiment and the second embodiment, it can be installed even in a room with a low ceiling, and the imaging system can be moved closer to or behind the subject. In addition, it is possible to provide a C-arm type X-ray fluoroscopic imaging apparatus that can perform imaging from an angle that is greatly tilted compared to the conventional art.

  The present invention is not limited to the above embodiment, and can be variously modified without departing from the gist of the present invention.

1 is an external view of a C-arm type X-ray fluoroscopic apparatus according to the present invention. F.P.D. The schematic diagram which shows the structure of the expansion-contraction arm 7 'incorporated in the back-and-forth movement drive part 7. FIG. FIG. 6 is an external view of a C-arm type X-ray fluoroscopic apparatus according to a second embodiment of the present invention. FIG. 4 is a specific example (enlarged view) of the slide moving unit shown in FIG.

Explanation of symbols

7 FPD front / rear drive unit
7 '... telescopic arm

Claims (2)

A table on which the subject is placed; an X-ray irradiating means for irradiating the subject placed on the table with X-rays; and the X-ray irradiating means arranged opposite to each other with the subject interposed therebetween. X-ray transmission image detection means for detecting an X-ray transmission image transmitted through the subject and X-ray irradiation connected to the X-ray transmission image detection means and moving the X-ray transmission image detection means in the X-ray irradiation direction Direction moving means, support means comprising a substantially semicircular C-arm for connecting and supporting the X-ray irradiation means and the X-ray transmission image detection means, and X obtained by the X-ray transmission image detection means In an X-ray fluoroscopic apparatus including a display unit that performs image processing based on a radiographic image and displays an X-ray fluoroscopic image,
The X-ray irradiation direction moving means includes a plurality of outer struts having different cross-sectional sizes, middle struts, inner struts, pulleys, belts or sprockets and chains connected to the middle struts, and both sides of the middle struts. A pinion that is arranged and moved in conjunction with the pulley and belt or the sprocket and chain, and is in contact with the rack of the inner column and the rack of the outer column, and a motor that drives the pulley and belt or the sprocket and chain X-ray fluoroscopic imaging apparatus , wherein the middle strut and the inner strut are driven by the motor with respect to the outer strut .   The X-ray fluoroscopic imaging apparatus according to claim 1, wherein the rack of the inner support column moves with respect to the rack of the outer support column in response to the rotation of the pinion.

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