JPH0898832A - Medical bed device - Google Patents

Abstract

PURPOSE: To exclude the dislocation of a top board due to the fluctuation of axle-to-axle distance by providing a pinion unit which slides the top board on a bed by rotary motion and engaged with a rack mounted on the top board and providing a guide roller to keep the axle-to-axle distance between the rack and the pinion unit constant. CONSTITUTION: A linear guide 2 to fix a sliding direction and the rack 3 sliding by engaging with a pinion 4 mounted on a bed fixing side and extending along the longitudinal direction of the top board 1 are provided on the back face of the top board 1. The pinion 4 mounted on a cabinet 4 is engaged with the rack 3, and the pinion 4 is rotated by the driving power of a motor via a belt and a pulley 6. The guide roller 8 is provided on the side part of the cabinet 5 to keep the axle-to-axle distance (backlash) between the rack 3 and the pinion 4 constant, and the guide roller 8 is rotated by coming into contact with a projected part 3a protruding over the rack 3. Moreover, a slidable guide 9 is mounted on the cabinet 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical bed apparatus used for an X-ray diagnostic apparatus or the like, and more particularly to a technique for accurately adjusting the position of a tabletop.

[0002]

2. Description of the Related Art In recent years, X-ray imaging apparatuses have been widely used as medical diagnostic apparatuses have been developed. The X-ray diagnostic apparatus injects a subject between an X-ray tube and an image intensifier which are arranged to face each other, irradiates the X-ray, and collects the X-ray after passing through the subject by the image intensifier. However, the X-ray fluoroscopic image is taken.

In such an X-ray diagnostic apparatus, an imaging method called stepping DSA (digital subtraction angiography) has recently been adopted. The DSA captures blood flow images of a plurality of parts of the subject. First, X-ray images of a plurality of imaged regions are photographed while moving the subject together with the tabletop in one direction and used as mask images. After that, a contrast agent is injected into the blood vessel of the subject, and the X-ray image of the region to be imaged is imaged again in the reverse order of the previous imaging while moving the top plate in the direction opposite to that in the mask image imaging. And make this a live image. Then, when the mask image and the live image are subtracted, only the blood vessel image is imaged.

When performing such DSA, the position of the subject must be the same during live image photography and during mask image photography. If a shift occurs in the imaging position, images other than blood vessels remain significantly in the subtracted image, and a suitable blood vessel image cannot be obtained. For this reason, the movement control of the bed top must be accurately performed.

FIG. 3 is a sectional view of a conventional medical couch device top plate, in which reference numeral 1 is a top plate and 3 is a rack.

A pinion 4 is meshed with the rack 3, and the rack 3 is rotated by rotating the pinion 4.
Slides, and along with this, the top plate 1 moves in the longitudinal direction of the top plate 1. The rotational power of the pinion 4 is supplied from the pulley 6 via a rotary shaft in the housing 5 by a drive motor or the like (not shown). The housing 5 is fixed to the bed base 7.

[0007]

However, in such a conventional medical bed apparatus as described above, the top plate 1 itself is distorted by the load of the subject when the moving distance of the top plate 1 increases. As a result, the axial distance (backlash) between the rack 3 and the pinion 4 shown in FIG. 3 is changed, and the accuracy of the movement control of the top plate 1 is reduced.

Particularly, when the top plate is projected from the bed base, backlash becomes large, and there is a problem that the positioning accuracy is lowered when the moving direction of the top plate is switched.

Further, when the stepping DSA diagnosis is performed on the bed having such a large backlash, there is a problem that a deviation between the mask image and the live image becomes large and a good subtraction image cannot be obtained.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to:
It is an object of the present invention to provide a medical bed apparatus capable of accurately controlling the movement of the tabletop.

[0011]

To achieve the above object, the present invention comprises a bed fixed to the floor and a top plate slidably mounted in the longitudinal direction of the bed. In a medical bed apparatus for placing a subject on the table and moving the subject to a desired position by sliding the table, a rack attached to the table and a rack attached to the table meshes with the rack and rotates. A pinion unit that slides the top plate by movement, a drive system that transmits rotational power to the pinion unit, and a guide roller that maintains a constant axial distance between the rack and the pinion unit. is there.

Further, in the above invention, it is desirable to further provide a slide guide for adjusting so that the positional relationship between the rack and the pinion unit becomes constant.

[0013]

According to the present invention constructed as described above, the axial distance between the rack and the pinion unit can be kept constant by the guide roller and the slide guide. Therefore, it becomes possible to prevent the top plate from being displaced due to the change in the axial distance.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a top view showing the configuration of the medical bed apparatus of the present invention. In the figure, a linear guide 2 for fixing the sliding direction on the back surface of the top plate 1, and a rack 3 that slides by engaging with a pinion 4 mounted on the bed fixing side.
Is provided. Further, the pulley 6 is connected to the motor 12 via the belt 11. 1 (B) relates to an embodiment of the present invention, and is a view showing a cross section taken along the line AA in FIG. 2, and FIG. 1 (A) shows a pinion unit (consisting of a pinion 4 and a housing 5) and a rack 3. It is an upper surface enlarged view which shows a connection state.

As shown in FIG. 1A, a rack 3 is attached to the top plate 1 along the longitudinal direction of the top plate 1, and the rack 3 meshes with a pinion 4 attached to a housing 5. ing. Then, the pulley 6 is connected to the motor 1 via the belt 11.
The rotary power transmitted to the pulley 6 is transmitted to the pinion 4 via the housing 5. Then, when the rack 3 is rotated, the rack 3 slides, and along with this, the top plate 1 moves in the longitudinal direction. Further, reference numeral 2 is a linear guide for stabilizing the moving direction of the top plate 1.

The motor 5 and the pulley 6 are arranged on the same horizontal plane with respect to the top plate 1, and are arranged so that the belt 11 is not easily loosened even if the pulley 6 moves in the vertical direction.

In this embodiment, in order to keep the axial distance (backlash) between the rack 3 and the pinion 4 constant, a guide roller 8 is attached to the side of the housing 5, and the guide roller 8 is attached to the side of the housing 5. 8 contacts the protrusion 3a protruding from the rack 3 and rotates. At this time, since the guide roller 8 acts so as to press the rack 3 toward the pinion 4 side, the distance between the axes does not increase. Therefore, it is possible to prevent the top plate position from fluctuating due to the change in the axial distance, and it becomes possible to perform the position control of the top plate 1 with high accuracy.

Further, a slide guide 9 is attached to the housing 5, and the slide guide 9 is fixed to the bed base 7. The slide guide 9 functions to shift the mounting position of the housing 5 by following the positional deviation of the rack 3 in the vertical direction (vertical direction of the top plate 1). That is, when the load is applied to the top plate 1 and the rack 3 acts to separate from the pinion 4, the slide guide 9 slides in the direction of the arrow N, so that the pinion 4 follows the shift of the rack 3.

According to such a configuration, the rack 3
The axial distance between the pinion 4 and the pinion 4 can be maintained more accurately, and the accuracy of the movement control of the top plate 1 is improved. Further, the slide guide may be composed of rollers and rails.

[0020]

As described above, according to the present invention,
Since the axial distance between the pinion and the rack can be kept constant, the accuracy of the movement control of the top plate is improved. In this way, a bed with less backlash when moving the top,
By using the X-ray bed apparatus that performs the stepping DSA, there is an effect that a positional deviation between the live image and the mask image is eliminated and a clear blood flow image can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a top plate of the present invention.

FIG. 3 is a configuration diagram showing a conventional example.

[Explanation of symbols]

1 Top plate 2 Linear guide 3 Rack 4
Pinion 5 Housing 6 Pulley 7 Bed base 8 Guide roller 9 Slide guide 11 Belt 12 Motor

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location A61G 13/12 13/02 7344-4C A61G 13/00 D

Claims (2)

[Claims] 1. A bed, which comprises a bed fixed to the floor and a top plate slidably mounted in the longitudinal direction of the bed, a subject is placed on the top plate, and the top board slides. In a medical couch device for moving a subject to a desired position, a rack attached to the couchtop, a pinion unit attached to the couch that meshes with the rack and slides the couchtop by rotational movement, and the pinion unit. A drive system for transmitting rotational power to the guide roller, and a guide roller for maintaining a constant axial distance between the rack and the pinion unit,
A medical couch device comprising: 2. The medical bed apparatus according to claim 1, further comprising a slide guide for adjusting the positional relationship between the rack and the pinion unit so as to be constant.