JPS632611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a subject mounting table drive mechanism for an X-ray diagnostic apparatus such as an X-ray fluoroscopic imaging apparatus.

Conventionally, this type of imaging device has been used, for example, as shown in FIG.
As shown in FIG. 2, a large gear 2 that integrally supports a patient (subject stage 1) is rotatably provided, and a drive motor 4 is connected to this large gear 2 via a small gear 3. However, it is common to rotate or roll the patient placed on the patient table 1 into a desired posture by appropriately rotating the drive motor 4 during imaging.

However, since the large gear 2 has a relatively large diameter, this type of gear increases its weight in order to maintain its mechanical strength, and it is extremely troublesome to form teeth on the outer circumferential surface. However, the disadvantage is that the manufacturing cost is extremely high. In addition, a patient table 1 and a large gear 2 are also provided.
If the allowable rotation angle is set to 360° or more,
Another problem is that it is difficult to provide a mechanical stopper to prevent overrun due to the nature of the mechanism.

This invention was made in view of the above circumstances, and the driving part of the patient table is easy to manufacture, so costs can be reduced, and the permissible rotation angle of the patient table is 360 degrees or more. The present invention provides a patient mounting table drive mechanism for an X-ray diagnostic apparatus such as an X-ray fluoroscopic imaging apparatus, which can easily be provided with a mechanical stopper to restrict its rotation even when the apparatus is set to .

An embodiment of the present invention will be described below with reference to FIGS. 3 to 9.

In the figure, 11 is a drum, 12 is a chain wound around the outer peripheral surface of this drum 11, and 13 is this chain 1.
A sprocket 2 is meshed with the sprocket 2, a drive motor 14 rotates the drum 11 through the sprocket 13, and a patient table 15 is supported by the drum 11.

The drum 11 has a rotating shaft 11 at the axial center of one end surface.
It has a cylindrical shape with a protruding part a, and its rotating shaft 11a
is rotatably supported by a fixed frame 17 via a bearing 16 in the direction of arrow AB. Further, on the outer circumferential surface of the drum 11, a protrusion 11b having a U-shaped cross section and serving as a chain guide is formed in a spiral shape for one or more turns as shown in FIG. The chain 12 is fitted along the upper side of this protrusion 11b. In other words, the above chain 12
is guided by the protrusion 11b and wound helically around the outer peripheral surface of the drum. Further, the end of this chain 12 is made substantially coincident with the end of the protrusion 11b, and U-shaped fixtures 18, 19 are attached to this end.
The fixing members 18 and 19 are fixed to the outer peripheral surface of the drum 11 near the ends of the protrusions 11b using bolts 20, for example. Note that at least one of the fixtures 18 and 19 is connected to the chain 1
2, the fixing position can be changed as appropriate in the chain tensioning direction. On the other hand, the sprocket 13 meshes with the chain 12 at the upper end of the drum 11 in the drawing, and its axial center is connected to the drive shaft 14a of the drive motor 14. The drive motor 14 is supported so as to be slidable in the axial direction of the drum 11 in the direction of arrow CD, and the meshing position of the sprocket 13 and the chain 12 changes as the drum 11 rotates. Be able to respond to change. Further, a frame body 21 is arranged at a predetermined interval on the end face of the drum 11 so as to be able to rotate freely with its axis aligned with the drum 11, and the frame body 21 and the end face of the drum 11 are The patient placement table 15 is installed between them, and as the drum 11 rotates, the patient placement table 15 rotates together with the rotation of the drum 11. Patient A is fixed onto this patient table 15 with a band 22. 23 is a spot shot, and 24 is an X-ray tube. Both 23 and 24 are integrally supported by the patient table 15, and rotate with the rotation of the patient table 15.

With such a configuration, it is of course possible to rotate the patient table to a desired posture by rotating the drive motor, as in the conventional case, but the drive motor 14 As a means of transmitting the power of This eliminates the need for large-diameter gears that require precision and require a great deal of time and effort to manufacture, and therefore, the manufacturing cost can be significantly reduced.

Note that the winding state of the chain is not limited to the above-mentioned structure, and may be wound endlessly, for example.
In other words, if the chain is spirally wound around the outer circumferential surface of the drum, stoppers may be provided at both ends of the chain, or the fixing devices 18 and 19 of the chain 12 may function as stoppers as shown in FIG. However, even if the permissible rotation angle of the patient table 15 is set to 360° or more, it is difficult to provide a mechanical stopper as in gear drive or endless chain drive. There is no such inconvenience at all. In addition, with this configuration, the tension of the chain 12 can be adjusted simply by changing the fixing positions of the fixtures 18 and 19, so the outer diameter of the drum and the length of the chain can be adjusted compared to a chain wound endlessly. There is no need for high precision in the dimensions.

Further, in the above embodiments, a so-called rotation operation in which the spot shot 23 and the X-ray tube 24 are rotated together with the patient table has been described, but the present invention does not necessarily apply to such a system. However, the present invention is not limited to this, and includes, for example, a so-called rolling motion in which a spot shot and an X-ray tube are fixed independently of a patient table.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional example, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a side view showing an embodiment of this invention, and Fig. 4 is a sectional view taken along the line - - in Fig. 3. 5 is a side view showing the drum section of the same embodiment, FIG. 6 is a view taken in the direction of the arrow in FIG. 5, FIG. 7 is a partially enlarged view showing the same embodiment, and FIG.
9 is a partially enlarged view showing the end of the chain in the same embodiment, and FIG. 10 is a sectional view taken along the line - in FIG. 9. DESCRIPTION OF SYMBOLS 11...Drum, 12...Chain, 13...Sprocket, 14...Drive motor, 15...Patient placement table.

Claims (1)

[Claims] 1. In the patient table drive mechanism of an X-ray diagnostic device that rotates the patient table disposed in the space facing the X-ray source system and the X-ray detection system, A cylindrical member, an engaging member threaded around the outer peripheral surface of the cylindrical member for one or more turns, a gear meshed with the engaging member, and a gear connected through the gear and the engaging member. A subject mounting table drive mechanism for an X-ray diagnostic apparatus comprising a subject mounting table supported by the cylindrical member and rotating integrally with the cylindrical member.