JPS6364213B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray imaging apparatus used for cardiovascular angiography, particularly coronary angiography.

Cardiovascular angiography is performed as shown in Figure 1 a and b.
It is necessary to photograph the front, side, first oblique, and second oblique positions for the axial cross section shown in figure b, and also to take images at many positions such as the front and oblique positions in the axial longitudinal cross section of figure b. Photography is required.

Conventionally, as shown in FIG. 2, this type of X-ray imaging apparatus has an X-ray tube section 60 and an X-ray image detection device, such as an image intensifier (hereinafter referred to as I), at both ends of a horizontal U-shape. An arm 62 having a section 61 (referred to as . . . ) is known. This arm 62 is rotatably supported by a shaft 64 with respect to a pedestal 63 in the direction of arrow A-A' in the figure.
By rotating the arm 62, a transverse section of the body axis is photographed. Further, the longitudinal section of the body axis is obtained by rotating the legs 66 of the bed 65 on which the subject is placed in the direction of the arrow BB' in the figure about the fulcrum Z.

In such an X-ray imaging device, there is no problem when taking a transverse section of the body axis, but when taking a longitudinal section of the body axis, the position of the subject is determined by rotating the bed 65 and the legs 66 about the fulcrum Z. I had to change. However, in cardiac angiography, it is desirable for the subject to remain as still as possible because catheters are inserted, contrast agents are injected, and the like.

In response to such demands, an X-ray photographing apparatus as shown in FIG. 3 has been proposed as an improved version of the X-ray photographing apparatus shown in FIG. The X-ray tube part 60 and the I part 61 are attached to one end of each of the double link members 67 and 68 so as to be rotatable in the direction of arrow C-C' in the figure. The ends of the arm members 69 and 70 are indicated by arrow D--
They are connected so that they can rotate in the D′ direction. and,
The arm members 69 and 70 are rotatably connected to a shaft 72 which is rotated by a pedestal 71 in the direction of arrow A--A' in the figure.

Therefore, for imaging the body axis cross section, the axis 72
For rotating the body and photographing the longitudinal section of the body,
This is accomplished by rotating both or one side of the arm members 69 and 70 clockwise or counterclockwise by a mechanism not shown. Although this X-ray imaging device can take images from various directions while keeping the subject stationary, two arm members 69 and 7
0, the overall length of the device became longer and the imaging room had to be made larger.

This invention was made based on the above circumstances, and provides an X-ray imaging device that is capable of imaging a subject while it remains stationary, and that also enables improved imaging efficiency and miniaturization of the imaging device. The purpose is to provide

Next, the present invention will be described with reference to embodiments shown in the drawings.

4 to 11 show an embodiment of the X-ray photographing apparatus of the present invention. In each figure, 1 is an X-ray photographing apparatus, and this X-ray photographing apparatus 1 has a ceiling 2 with a desired distance It is provided with a pair of guide rails 3, 3 which are spaced apart. A frame 5 is disposed on the guide rails 3, 3 so as to be able to reciprocate in the direction of the arrow F via rollers 4, 4 on the side. A frame 6 is attached, and this inner frame 6a is configured to be movable up and down in the direction of arrow E via a roller, a motor, and a lead screw (not shown). A hook-shaped support 7 is attached to the lower part of the inner frame 6a so as to be rotatable in the direction of arrow G. This support 7 incorporates a bearing (not shown), a motor, and a reducer (not shown) that enable rotation of a horizontal U-shaped arm (hereinafter simply referred to as "U arm") 8, and a shaft (not shown) fixed to the U arm 8. The U-arm 8 can be rotated in the direction of arrow H through the . And this U
One end 8a of the arm 8 is provided with an I, I part 10 via a first oblique entry mechanism 9A, and an X-ray tube 11 is provided at the other end 8b via a second oblique entry mechanism 9B.
The I, I section 10 and the X-ray tube 11 are arranged to face each other so as to sandwich the subject placed on the top plate. In the drawing, reference numeral 26 is a rotation angle meter of the U-arm 8, and reference numeral 27 is a scale plate that displays the angle of the I, the I section 10, and the X-ray tube 11 when they are obliquely entered.

Next, the first oblique entry mechanism 9A will be explained in detail with reference to FIGS. 5 to 7. One end 8a of the U-arm 8
Two pairs of rollers 12a and 12b are provided at a desired interval on the side wall of the U-arm 8.
A rack 13 is provided in the upper part of one end 8a along the longitudinal direction. At one end 8a of this U-arm 8, a first outer frame 14 holds a guide rail 14a provided on the inner wall between a pair of rollers 12a and 12b of one end 8a of the U-arm 8, and moves in the direction of arrow _I1 . It is configured to be able to reciprocate. A motor 15 is disposed on the top of the first outer frame 14 . Rotating shaft 15a of this motor 15
is connected to the worm 16a of the worm box 16 via a coupling 15b. A worm wheel 17a of a rotating shaft 17, which is pivotally supported on the first outer frame 14 via a bearing 14b, is engaged with the worm 16a of the worm box 16, and a number of teeth are provided at both ends of the rotating shaft 17. _Z1 ,
Gears 18a and 18b designated as _Z2 are respectively attached. This one gear 18a meshes with a rack 13 attached to one end 8a of the U-arm 8. The other gear 18b meshes with a rack 19a of a first sliding member 19, which will be described later, via a gear 22. A rotating shaft 14c is pivotally supported at the lower part of the first outer frame 14 via a bearing 14d. A lower part of a first support member 20 is attached to this rotating shaft 14c, and the above-mentioned I and I portions 10 are attached to the outside of this first support member 20, and the I portion 10 is vertically guided inside. rail 2
It is equipped with 0a. the first outer frame 1
A first sliding member 19 is connected to one side of 4 via guide members 21a and 21b provided at a desired interval.
is arranged so as to be able to reciprocate in the direction of arrow _G1 .
At the top of this first sliding member 19 is a rack 19a.
A gear 18b of the rotary shaft 17 is meshed with the rack 19a via the gear 22, and as the outer frame 14 moves by an amount _D1 , a first sliding movement occurs. The amount of movement of member 19 is d ₁
It's just that you're starting to move extra. Further, the first sliding member 19 is provided with a long hole 19b extending in the longitudinal direction near one end.
A roller 23 provided on the side of the first outer frame 14 is fitted into the inside of the roller 9b. A roller 19c is attached to the other end of the first sliding member 19, and this roller 19c is inserted into the elongated hole 2 of the cover 28.
8a and is fitted into a guide rail 20a provided on the support member 20. In the drawing, 24 is an optical system, 25 is a TV camera, 28 and 29 are covers, and 4
9 is a cine camera.

Next, to explain the operation in which the I and I portions 10 enter obliquely, the I and I portions 10 in FIG.
When entering the oblique state shown in FIG. b, first, the motor 15 disposed on the upper part of the first outer frame 14 is rotated, and the worm 16a connected to the rotating shaft 15a via the coupling 15b is rotated. This rotation of the worm 16a causes the gears 18a and 18b of the rotating shaft 17 to be connected via the worm wheel 17a.
will each rotate. As a result, since the gear 18a of the rotating shaft 17 is meshed with the rack 13 attached to the one end 8a of the U-arm 8, the gear 18a rolls along the rack 13, and the first outer frame 14 moves toward the guide rail. 14a and a pair of rollers 12a, 12b, respectively, along one end 8a of the U-arm 8. Meanwhile, at the same time, the gear 18b of the rotating shaft 17
A guide member 21a is provided on the side of the outer frame 14,
The first sliding member 1 disposed via 21b
Since the racks 19a of 9 are engaged, the first sliding member 19 moves in the same direction as the moving direction of the first outer frame 14, and this first sliding member 19
Since the amount of movement of the first outer frame 14 is larger than the amount of movement of the first outer frame 14 by _d1 ,
The first support member 20 having a rotational axis 17 pivotally supported by the first outer frame 14 rotates clockwise by α angle and tilts as a fulcrum. At this time, the first support member 20 is connected to the inner guide rail 20.
a and the roller 19c fitted thereto.

In this way, if the intersection of the rotation center line of the U-arm 8 and the beam line of the X-ray tube 11 and I, I section 10 in FIG. The center point b ₁ of axis 17 is b′ ₁
At this point, the center point c ₁ of the roller 19c fixed to the first sliding member 19 moves from c′ ₁ to c″ ₁ .

Therefore, according to Figure 6a, ₁ = L, _{1 1} = H ₁ , ₁ ′ ₁ = D, ′ ₁ ″ ₁
= d ₁ , the following relationship holds: H ₁ /L ₁ =Z ₂ /Z ₁ =d ₁ /D ₁ (1).

Furthermore, to explain the second oblique entry mechanism 9B with reference to FIGS. 8 to 11, two pairs of rollers 30a and 30b are arranged at a desired interval on the three side walls of the other end 8b of the U-arm 8. Also, U arm 8
A rack 31 is provided along the longitudinal direction at the lower part of the other end 8b. A guide rail 32a provided on the inner wall of the second outer frame 32 is connected to the other end 8b of the U-arm 8.
It is configured to be able to reciprocate in the direction of arrow _I2 by being held between a pair of rollers 30a and 30b. A motor 33 is arranged at the bottom of this second outer frame 32. The rotating shaft 33a of this motor 33 is connected to the warm box 3 via a coupling 33b.
It is connected to the No. 4 worm 34a. A worm wheel 35a of a rotary shaft 35, which is pivotally supported on the second outer frame 32 via a bearing 32b, is engaged with the worm 34a of the worm box 34. Gears 36a and 36b with numbers ₃ and ₄ are respectively attached. This one gear 36a meshes with a rack 31 attached to the other end 8b of the U-arm 8. Further, the other gear 36b meshes with a rack 37a of a second sliding member 37, which will be described later, via a gear 38. A rotating shaft 32c is pivotally supported on the upper part of the second outer frame 32 via a bearing 32d. A second support member 3 is attached to this rotating shaft 32c.
The X-ray tube 11 is attached to the outside of this second support member 39, and a vertical guide rail 39a is attached to the inside of the second support member 39.
Equipped with: A second sliding member 37 is disposed on one side of the second outer frame 32 so as to be able to reciprocate in the direction of arrow _G2 via guide members 40a and 40b provided at a desired interval. . A rack 37a is formed at the lower part of the second sliding member 37, and the gear 3 is attached to the rack 37a.
8, the gear 36b of the rotating shaft 35 is engaged with the gear 36b of the rotating shaft 35, and as the second outer frame 32 moves by a moving amount D2, the second sliding member ₃₇ moves by a moving amount _d2.
I'm starting to move an extra minute. Also,
The second sliding member 37 has a long hole 37b extending in the longitudinal direction near one end, and a roller 41 provided on the side of the second outer frame 32 is inserted into the long hole 37b. It is fitted. A roller 37c is attached to the other end of the second sliding member 37, and this roller 37c passes through a long hole 42a of the cover 42 and fits into a guide rail 39a provided on the second support member 39. are combined. In addition, 4 in the drawing
3 is a movable X-ray diaphragm, and 49 is a cover.

Next, the operation of oblique entry of the X-ray tube 11 will be explained.
When changing the X-ray tube 11 from the vertical state shown in FIG. 9a to the oblique state shown in FIG. 9b, first rotate the motor 33 disposed at the bottom of the second outer frame 32, The worm 34a connected via the coupling ring 33b is rotated. This rotation of the worm 34a causes the gears 36a and 36b of the rotating shaft 35 to rotate via the worm wheel 35a. As a result, since the gear 36a of the rotating shaft 35 is meshed with the rack 31 attached to the other end 8b of the U-arm 8, the gear 36a rolls along the rack 31, and the second outer frame 32 is used as a guide. Rail 32a and pair of rollers 3
0a and 30b, respectively, and slide along the other end 8b of the U-arm 8. Meanwhile, at the same time, the gear 36b of the rotating shaft 35 is engaged with the rack 37a of the second sliding member 37, which is disposed on the side of the second outer frame 32 via the guide members 40a, 40b. Second sliding member 3
7 moves in the same direction as the moving direction of the second outer frame 32, and the amount of movement of this second sliding member 37 is larger than the amount of movement of the second outer frame 32 by _d2 . , a second having an X-ray tube 11
The support member 39 rotates clockwise by an angle α and tilts about the rotating shaft 32c pivotally supported by the second outer frame 32 as a fulcrum. At this time, the second support member 39 is inclined via the inner guide rail 39a and the roller 37c fitted thereto.

In this way, if the intersection of the rotation center line of the U-arm 8 and the beam line of the X-ray tube 11 and I, I section 10 in FIG. The center point b ₂ of the axis 32c is
At point _b'2 , the center point _c2 of the roller 37c fixed to the second sliding member 37 moves from _c'2 to _c''2 .

Therefore, from Figure 9a, ₂ = L ₂ , _{2 2} = H ₂ , ₂ ′ ₂ = D ₂ , ′ ₂ ″ ₂
= d ₂ , then the following relationship holds: H ₂ /L ₂ =Z ₄ /Z ₃ =d ₂ /D ₂ ...(2) Therefore, from equations (1) and (2), L ₂ /L ₁ = H ₂ /H ₁ =Z ₂ /Z ₁ =Z ₄ /Z ₃ ...(3) holds.

In the apparatus, I, I part 10 and X-ray tube 11
In order to arrange the gears 18a and 18a to face each other using the diagonal insertion mechanism using the rack and gears described above,
(Z ₁ ) or gear 44 meshing with gear 36a (Z ₃ )
a and 44b are provided to transmit this rotation to potentiometers 45 and 45b.
5 and 45b send signals to the motors 15 and 33, thus forming a servo mechanism in which the I, I section 10 and the X-ray tube 11 follow each other while facing each other. Incidentally, although the above-mentioned embodiment shows a tilting device in one direction, the tilting device is not limited to this and can also be tilted in the opposite direction by rotating the motor in the reverse direction.

In addition to this servo mechanism tracking method,
For example, as shown in FIG. 12, gears 18a and 36a having the number of teeth _Z1 and _Z3 and chain wheels 46a and
6b, respectively, and both chain wheels 46a, 46
In b, an endless chain 47 arranged along the U-arm 8 is stretched across a chain wheel 48, and while the endless chain 47 makes I, the I part 10 and the X-ray tube 11 face each other, It may be configured to follow. In this case, one of the driving members of the I, I part 10, or the oblique entry mechanism of the X-ray tube 11 can be omitted.

It should be noted that each of the above embodiments is merely an example, and it goes without saying that each member can be replaced with another member having the same function.

Since the present invention is constructed as described above, the entire apparatus is compact and the imaging room can be made small. It is possible to image a transverse section and a longitudinal section along the body axis while the subject remains stationary, and it is economical because the imaging efficiency can be significantly improved. Moreover, it has excellent effects such as being able to supply highly reliable products at low cost.

[Brief explanation of drawings]

FIGS. 1a and 1b are explanatory diagrams showing the time of X-ray imaging of a human body, FIGS. 2 and 3 are front views showing examples of different conventional X-ray imaging apparatuses, and FIG. 5 is a side view of the same, and FIGS. 6a and 6b are enlarged front views of the oblique entry mechanism before and after oblique entry of the I and I portions, respectively;
Fig. 7 is a side view of the same, Fig. 8 is a plan view of the same, Figs. FIG. 11 is a plan view of the same, and FIG. 12 is a schematic explanatory diagram showing another embodiment of the follow-up transmission mechanism of the present invention. 1... X-ray imaging device, 2... Ceiling, 5... Frame, 8...
U arm, 9A, 9B...Slanted entry mechanism, 10...I, I
Part, 11...X-ray tube, 12a, 12b...roller, 1
4... Outer frame, 15... Motor, 16... Warm box, 17... Rotating shaft, 18a, 18b... Gear, 19... First sliding member, 20... Supporting member, 3
0a, 30b...Roller, 32...Outer frame, 3
3... Motor, 34... Warm box, 35... Rotating shaft, 36a, 36b... Gear, 37... Second sliding member, 39... Support member, 41... Roller, 42... Cover, 43... X-ray movable aperture, 47 ...Endless chain.

Claims (1)

[Claims] 1. A pedestal that is movable along a rail installed on the ceiling surface, a support rotatably supported by this pedestal, a bifurcated arm whose one end is rotatably supported by this support, and these two a first oblique entry mechanism having a support member that is slidably provided at one end of the forked arm and tilts during movement; and a first oblique entry mechanism that is slidably provided at the other end of the forked arm and that tilts when moved. a second oblique entry mechanism having a support member that
The X-ray image detection device and the X-ray tube are equipped with an X-ray image detection device attached to the support member of the first oblique entry mechanism and an X-ray tube attached to the support member of the second oblique entry mechanism. An X-ray photographing apparatus characterized in that the X-ray imaging apparatus is disposed facing each other so as to sandwich a subject placed on a top plate.