JP3514043B2 - X-ray fluoroscope - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray fluoroscopic apparatus having a bed rotatable about a horizontal axis. 2. Description of the Related Art A conventional X-ray fluoroscopic apparatus 101 shown in FIGS.
An X-ray tube 110 above the couch 102, an image intensifier 111 below the couch 102,
A frame 103 supporting both ends of the bed 102, a sector gear 104 fixed to the support frame 103,
A base 106 for rotatably supporting a center of rotation of the gear 104 about a horizontal axis 105 along a direction perpendicular to the longitudinal direction of the bed 102, a pinion 108 meshing with the gear 104, and a driving motor 109 for the pinion 108 And The X-ray tube 110 is connected to the support frame 10.
3 is supported via a support 112. Between the bed 102 and the image intensifier 111, a plurality of X-ray films in a magazine are automatically sent one by one to a fluoroscopy position one by one, and at the same time, a photographing device 113 for automatically collecting the X-ray films after the shooting. Is arranged. When the pinion 108 is reciprocally driven to rotate, the gear 104 is rotated, and the bed 102 is reciprocally oscillated about a horizontal axis 105. By swinging in one direction, the upper surface of the bed 102 is vertically aligned,
The subject on the couch 102 can be in an upright position. Further, by swinging in the other direction, the head side (left side in FIG. 4) of the subject on the bed 102 can be lower than the foot side. The support position of the gear 104 by the base 106 is below the support frame 103, and the length of the bed 102 is set so that the gear 104 does not interfere with the bed 102, the photographing device 113, the fluoroscopic photographing mechanism, and the like. The direction is closer to one side (the right side in FIG. 3). In the above configuration, when the bed 102 is swung until the subject on the bed 102 is in the upright position, the support frame 103 is moved from the center of rotation of the gear 104 so that the floor does not interfere with the floor. The dimension B to one end of 103 is limited. On the other hand, the longitudinal dimension of the bed 102 needs to be longer than the height of the subject. Therefore, the gear 1
A dimension D from the rotation center of 04 to the other end of the support frame 103 is longer than a dimension B to one end. If the dimension D from the center of rotation of the gear 104 to the other end of the support frame 103 becomes longer, the bed 102
The inclination angle for making the upper subject's head side lower than the foot side cannot be made sufficiently large. In order to increase the inclination angle, it is necessary to increase the height dimension C from the floor surface to the rotation center of the gear 104. However, when the height dimension C is increased, the gear 104 is supported below the support frame 103 in the above configuration.
The height from the floor to the upper surface of the bed 102 becomes excessive. Therefore, by supporting the gear 104 at a position away from the support frame 103 in a direction perpendicular to the longitudinal direction of the bed, the height dimension C can be increased without increasing the height from the floor to the upper surface of the bed 102. Can be increased. However, if the support position of the gear 104 is simply separated from the support frame 103, the gear 1
A bearing mechanism for supporting the bed 04 protrudes largely from the support frame 103 in a direction perpendicular to the longitudinal direction of the bed. Therefore, the size of the device in the direction perpendicular to the longitudinal direction of the bed becomes excessively large, and there is a problem that the device cannot be installed in a narrow space. Further, by moving the support frame 103 in the longitudinal direction of the bed 102 in conjunction with the rotation of the gear 104, interference between the support frame 103 and the floor can be avoided, but the mechanism becomes extremely complicated. It will be expensive. FIGS. 5 and 6 show another conventional X-ray fluoroscopic apparatus 101 'different from the above-mentioned conventional example. The difference from the above-mentioned conventional example is that first, the support frame 10 is perpendicular to the longitudinal direction of the bed.
At a position distant from 3, an auxiliary frame 103 ′ is integrated with the support frame 103. The auxiliary frame 103 'is rotatably supported by an auxiliary base 106' integrated with the base 106 about a horizontal axis 105 'extending in a direction perpendicular to the longitudinal direction of the bed. Also,
The gear 104 is not supported at the center of rotation,
A groove is formed in the gear 104 along a circle concentric with the horizontal shaft 105 ′, and the inner peripheral surface of the groove serves as a guide surface 120, and the gear 104 is supported by the rollers 121 via the guide surface 120. Is done. Roller 121 is base 1
06. Thereby, the gear 10
4 is rotatable about its horizontal axis 105 '. The position where the roller 121 is supported by the base 106 and the position of the horizontal shaft 105 ′, which is the center of rotation of the gear 4, are away from each other from the perspective imaging position along the direction perpendicular to the longitudinal direction of the bed. Other parts are the same as those of the above-mentioned conventional example, and the same parts are denoted by the same reference numerals. In the case of this conventional example, the gear 10 can be moved from the floor surface without increasing the height from the floor to the upper surface of the bed 102.
The height dimension up to the rotation center of No. 4 can be increased. However, the gear 104 is supported by the base 106 near one edge along the longitudinal direction of the bed 102, and the auxiliary frame 103 'is connected to the auxiliary base 106' near the other edge.
Supported by the camera, the X
There is a problem that operations from a direction perpendicular to the longitudinal direction of the bed such as setting of a film magazine for supplying a line film and approaching a subject on the bed 102 are obstructed. An object of the present invention is to provide an X-ray fluoroscopic apparatus capable of solving the above problems. According to the present invention, there is provided an X-ray irradiating means, a support frame for a bed, a gear fixed to the support frame, and a rotation center portion of the gear in a longitudinal direction of the bed. In an X-ray fluoroscopic apparatus including a base rotatably supported on a horizontal axis center along a right angle direction and a reciprocating rotation driving means for the gear, the rotation center portion of the gear extends along a direction perpendicular to the longitudinal direction of the bed. The gear is supported by the base at a position away from the support frame, and the gear has a guide surface formed along a circle concentric with the rotation center of the gear, and a rolling element that supports the gear via the guide surface is provided. The gear is supported by the base so as to be rotatable about an axis parallel to the rotation axis of the gear, and the supporting position of the rolling element by the base is more horizontal than the supporting position of the rotation center portion of the gear by the base. With respect to the support frame, the position where the rolling element is supported by the base and the position where the rotation center of the gear is supported by the base are separated to the same side from the fluoroscopy position along the direction perpendicular to the longitudinal direction of the bed. It is characterized by having. According to the structure of the present invention, the center of rotation of the gear is supported at a position away from the support frame along a direction perpendicular to the longitudinal direction of the bed, so that it can be supported below the support frame. The height from the floor to the center of rotation of the gear can be increased without increasing the height from the floor to the upper surface of the bed. In addition to supporting the gear at the center of rotation, the gear is supported by a rolling element via a guide surface concentric with the center of rotation, and the two supporting positions are spaced apart from each other in the horizontal direction, so that the gear rotates. The axial dimension of the bearing mechanism that supports the center portion at the base can be shortened, so that the bearing mechanism can be prevented from protruding significantly from the support frame in a direction perpendicular to the longitudinal direction of the bed. Furthermore, since the support position of the rolling element by the base is set closer to the support frame in the horizontal direction than the support position of the rotation center of the gear by the base, the support portion of the rolling element by the base is It is possible to prevent the gear from being projected from the support frame in a direction perpendicular to the longitudinal direction of the bed, more than the support portion of the rotation center portion of the base. In addition, the support position by the base of the rolling element and the support position by the base of the rotation center of the gear are separated on the same side from the perspective imaging position along the direction perpendicular to the longitudinal direction of the bed, so that both support positions are On the side opposite to the arrangement, it is possible to prevent the operation of the bed from a direction perpendicular to the longitudinal direction of the bed. Embodiments of the present invention will be described below with reference to the drawings. The X-ray fluoroscopic apparatus 1 shown in FIGS.
The support frame 3 supports the bed 2, an X-ray tube (X-ray irradiating means) 10 arranged above the bed 2, and an image intensifier 11 arranged below the bed 2. . The support frame 3 includes a main body 3a, a bed connecting portion 3b at both ends of the main body 3a, and a main body 3a.
And a column connecting portion 3c at the upper center of the bed, supporting both ends of the bed 2 via the bed connecting portion 3b.
The X-ray tube 10 is supported via a support 12 connected to the X-ray tube c. A sector gear 4 is fixed to the main body 3a of the support frame 3. The center of rotation of the gear 4 is a base 6
As a result, it is supported rotatably about the horizontal axis 5 along the front-rear direction. A drive motor 9 for a pinion 8 that meshes with the gear 4 is built in the base 6. Between the couch 2 and the image intensifier 11, a plurality of X-ray films in a magazine are automatically sent one by one to a fluoroscopy position one by one, and at the same time, a photographing device 13 for automatically collecting the X-ray films after the photographing is automatically collected. Are supported by the support frame 3. A known device can be used as the flash photography device 13. When the pinion 8 is driven to reciprocate, the gear 4 is rotated, and the bed 2 is reciprocally oscillated about the horizontal shaft 5. By swinging in one direction, the upper surface of the couch 2 can be vertically aligned, and the subject on the couch 2 can be set up. Further, by swinging in the other direction, the head side (left side in FIG. 2) of the subject on the bed 2 can be lower than the foot side. The rotation center of the gear 4 is supported by the base 6 at a position away from the support frame 3 at right angles to the bed in the longitudinal direction. That is, the gear 4
A first extension portion 4b extending from the gear body 4a so as to be separated from the support frame 3 along a direction perpendicular to the bed longitudinal direction, and a first extension portion extending upward from the tip of the first extension portion 4b. 2 extension part 4c. The second extension portion 4c is attached to the base 6 via a support shaft 22 rotatable about the horizontal axis 5. The support shaft 22 is supported by the base 6 via a bearing (not shown). On one side surface of the gear body 4a, a groove 31 is formed along a circle concentric with the horizontal shaft 5, and an inner peripheral surface of the groove 31 is a guide surface 31a. That is, the guide surface 31 a follows a circle concentric with the rotation center of the gear 4. The gear 4 is supported by two rollers (rolling elements) 41 via the guide surface 31a. That is, each roller 41 is inserted into the groove 31 and its horizontal shaft 5
Is supported by the base 6 so as to be rotatable about an axis parallel to the axis. The support position of the roller 41 by the base 6 is closer to the support frame 3 in the horizontal direction than the support position of the rotation center of the gear 4 by the base 6. Further, the support position of the roller 41 by the base 6 and
The support position of the rotation center of the gear 4 by the base 6 is separated from the see-through photographing position on the same side (the right side in FIG. 1) along the direction perpendicular to the longitudinal direction of the bed. An anti-sway roller 45 is mounted on the base 6 so as to be rotatable about the vertical axis, and the anti-sway roller 45 is applied to the other side surface of the gear body 4b. This prevents the gear 4 from swinging in the direction perpendicular to the longitudinal direction of the bed. According to the above configuration, the rotation center of the gear 4 is supported at a position away from the support frame 3 along a direction perpendicular to the longitudinal direction of the bed, so that the gear 4 can be supported below the support frame 3. In comparison, the height from the floor to the center of rotation of the gear 4 can be increased without increasing the height from the floor to the upper surface of the bed 2. This allows
With a simple, reliable and low-cost structure, the inclination angle for making the subject's head side on the bed 4 lower than the foot side is made sufficiently large to make it convenient for imaging. be able to. In addition to supporting the gear 4 at the center of rotation, the gear 4 is supported by rollers 41 via a guide surface 31a concentric with the center of rotation, and the two supporting positions are separated from each other in the horizontal direction. The axial dimension of the bearing mechanism that supports the rotation center of the gear 4 on the base 6 can be shortened, so that the bearing mechanism can be prevented from protruding significantly from the support frame 3 in the direction perpendicular to the longitudinal direction of the bed. That is, the length of the gear 4 supported by the base 6 (L in FIG. 1) can be made as small as possible. Furthermore, the roller 4
The support position of the base 6 is closer to the support frame 3 in the horizontal direction than the support position of the center of rotation of the gear 4 by the base 6, so that the roller 41
Can be prevented from protruding from the support frame 3 in the direction perpendicular to the longitudinal direction of the bed from the support portion of the base 6 at the center of rotation of the gear 4. Thereby, the X-ray fluoroscopic apparatus 1 can be installed in a small space. Further, the support position of the roller 41 by the base 6 and the support position of the rotation center of the gear 4 by the base are separated to the same side from the fluoroscopic position along the direction perpendicular to the longitudinal direction of the bed. On the side opposite to the position where the two support positions are arranged, it is possible to prevent an operation such as setting the X-ray film magazine of the apparatus 13 for rapid photography from a direction perpendicular to the longitudinal direction of the bed. The present invention is not limited to the above embodiment. For example, the guide surface formed on the gear is not limited to the one formed by the inner peripheral surface of the groove, but may be formed by, for example, a step surface formed on the side surface of the gear. According to the present invention, the height from the floor to the upper surface of the bed is not increased, and the size in the direction perpendicular to the longitudinal direction of the bed is not increased. With an inexpensive structure, the inclination angle for making the subject's head side on the bed lower than the foot side can be made sufficiently large to make it convenient for imaging, and in a narrow space. X-ray fluoroscopy apparatus suitable for installation in a room can be provided. Further, it is possible to prevent the operation of setting the X-ray film magazine of the apparatus for photographing at a speed from a direction perpendicular to the longitudinal direction of the bed to improve the photographing efficiency, etc.

[Brief description of the drawings] FIG. 1 is a side view of an X-ray fluoroscopic apparatus according to an embodiment of the present invention. FIG. 2 is a front view of the X-ray fluoroscopic apparatus according to the embodiment of the present invention. FIG. 3 is a side view of a first conventional X-ray fluoroscopic apparatus. FIG. 4 is a front view of a first conventional X-ray fluoroscopic apparatus. FIG. 5 is a side view of a second conventional X-ray fluoroscopic apparatus. FIG. 6 is a front view of a second conventional X-ray fluoroscopic apparatus. [Explanation of symbols] 2 sleeper 3 Support frame 4 gear 6 Base 10 X-ray tube 31a Guide surface 41 rollers

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61B 6/04

Claims (1)

(57) [Claims 1] The X-ray irradiating means, the support frame of the bed, the gear fixed to the support frame, and the rotation center of the gear are arranged in a direction perpendicular to the longitudinal direction of the bed. An X-ray fluoroscopic apparatus comprising a base rotatably supported about a horizontal axis along the axis and a reciprocating rotation driving means for the gear, wherein the rotation center of the gear is supported along a direction perpendicular to the longitudinal direction of the bed. The gear is provided with a guide surface along a circle concentric with the rotation center of the gear, supported by the base at a position away from the frame, and a rolling element that supports the gear via the guide surface is
The rolling element is supported by the base so as to be rotatable about an axis parallel to the rotation axis of the gear, and the supporting position of the rolling element by the base is more horizontal than the supporting position of the rotation center portion of the gear by the base. The position where the rolling element is supported by the base and the position where the rotation center of the gear is supported by the base are separated from the fluoroscopic imaging position on the same side along a direction perpendicular to the longitudinal direction of the bed. X-ray fluoroscope.