JP3257048B2 - Medical sleeper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical couch used for laying a subject on an X-ray CT apparatus, an MRI apparatus, or the like, which is a medical image diagnostic apparatus.

[0002]

2. Description of the Related Art Conventionally, when imaging a subject with an X-ray CT apparatus or the like, the subject lies on a specially designed medical bed. This medical couch is placed up and down and back and forth (in the height direction of the subject) with the subject lying down so that the slice plane to be imaged by the subject can be finely positioned with respect to the gantry in an X-ray CT apparatus or the like. ) To move the tabletop. Normally, when the slice plane is set, the top moves automatically according to the setting, but if you switch it to manual with a switch etc., the top can move freely and can be moved manually Can be.

[0003]

However, the conventional medical bed has a problem that the top plate can be completely freely moved at the time of manual operation, which may be dangerous or inconvenient. .

[0004] That is, since the top board is completely movable at the time of manual operation, there is a danger that the top board or a subject lying on the top board will collide with the gantry. If the top is too high or too low with respect to the tunnel section of the gantry, place the subject on the top and move the top manually to position the subject relative to the gantry. Then, because they do not enter the tunnel section, they hit each other. If the top plate is sent in particularly vigorously, it will move at a high speed and collide, thus increasing the danger.

Therefore, in order to avoid this danger, when the operator manually moves the top board, it is necessary to pay close attention to the height, position, moving speed, etc. of the top board, which is troublesome. Was.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a medical bed which is reduced in danger at the time of manual operation and which is safe so that an operator does not pay much attention.

[0007]

In order to achieve the above object, in a medical bed according to the present invention, switching between automatic and manual is possible, and at the time of automatic operation, the bed is forcibly moved by a built-in driving means and manually operated. Sometimes a top plate that can be manually moved, a detecting means for detecting the height and horizontal position of the top plate, and that the top plate is at a height and a horizontal position where there is a danger of collision during manual operation Control means for automatically determining the output from the detection means to generate a static torque in the drive means and controlling the drive means so as to apply the static torque to the top plate is provided.

[0008]

The top plate can be switched between automatic and manual, and is automatically moved by a built-in driving means at the time of automatic operation, but is manually movable at the time of manual operation. Then, the height and the horizontal position of the top plate are detected by the detecting means. The control means determines that the detected height and position of the top plate are in danger of collision, and when such a determination is made, the driving means generates a static torque to apply the static torque to the top plate. The driving means is controlled to be applied. Therefore, at the time of manual operation, when the top is moved manually, its position and height are detected, and when it is determined that the detected position and height are dangerous, the top speed is reduced. Or be stopped. As a result, at the time of manual operation, danger to the subject lying on the tabletop, such as a collision, is automatically avoided. Therefore, when the operator manually moves the top board, safety is automatically secured, so that the burden on the operator can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a medical couch 1 according to this embodiment includes a top plate 2 on which a subject 3 is laid, and a floor at a predetermined position with respect to a gantry 4 of an X-ray CT apparatus. It is installed in. The top 2 can be moved up and down in the vertical direction, and can move in the height direction of the subject 3 (the left and right direction in this figure). Therefore, although not shown in this figure, a motor for raising and lowering (stepping motor) and a motor for moving left and right (stepping motor) are provided.

FIG. 2 shows a driving system of the left / right moving motor at the time of manual operation. The motor 13 for left and right movement is mainly used in automatic operation, but is configured so that a current can be appropriately supplied from the driver circuit 12 also in manual operation. That is, the potentiometer 1 that detects the position of the top plate 2 in the left-right direction by transmitting the rotation of the motor 13 that rotates as the top plate 2 is manually moved.
4 and a potentiometer 15 for detecting the height of the top 2 are sent to the controller 11, and the controller 11 determines that the height and the position of the top 2 have reached predetermined conditions, and the driver circuit Current through motor 12
Send to Since the motor 13 is a stepping motor, when a current flows, the motor 13 generates a static torque proportional to the current.

Here, as shown in FIG. 1, the distance from the tip of the top plate 2 when the top plate 2 is at the most retracted position to the front surface of the gantry 4 is X, and the top plate 2 is the longest. Let Y be the distance to the top of the top 2 when it is in the advanced position.
Also, let A be the minimum value of the height of the tabletop 2 and B be the maximum value that is allowed for the tabletop 2 and the subject 3 to enter the tunnel section without hitting the gantry 4.

In this case, when the height of the tabletop 2 detected by the potentiometer 15 is equal to or smaller than A or equal to or larger than B, the controller 11 of FIG. 2 adjusts the potentiometer so that the static torque curve a of FIG. The driver circuit 12 is controlled in accordance with the position of the tabletop detected at 14. Accordingly, when the height of the top 2 is equal to or less than A or equal to or more than B, if the position of the top 2 approaches X, there is a risk of colliding with the gantry 4. Torque is generated in the motor 13. For this reason, a static torque is applied to the top plate 2 that has been moving freely so far, so that the top plate 2 does not move unless the force for manually moving it is increased. And avoid collisions.

When the height of the top 2 detected by the potentiometer 15 is not less than A and not more than B, the controller 11 controls the driver circuit 12 according to the position of the top detected by the potentiometer 14 to control the driver circuit 12 as shown in FIG. To obtain the static torque curve b. As a result, when the couchtop 2 and the subject 3 enter the tunnel section of the gantry 4, a certain amount of static torque is applied to the couchtop 2, and the couchtop 2 can be moved only slowly. This takes into account the anxiety generated by the subject 3 in the tunnel section of the gantry 4. Then, when the position of the top 2 approaches Y, the stationary torque is sharply increased so that the stationary state is achieved smoothly.

FIG. 4 shows a drive system of a left-right moving motor according to a second embodiment. In FIG. 4, the moving speed of the table 2 is detected by an encoder 16 connected to a motor 13 for moving left and right, the detected moving speed is input to the controller 11, and a driver circuit is provided in accordance with the detected moving speed. A current for generating a static torque is supplied from the motor 12 to the motor 13. In this case, the moving speed itself of the top plate 2 in the manual operation is detected, and the stationary torque is applied accordingly. Therefore, the moving speed is controlled, so that the speed can be controlled so as not to be a dangerous speed that may cause a collision or the like.

Since the gantry 4 may be inclined, a means for detecting the inclination angle of the gantry 4 is provided in these embodiments, and the controller 11 responds accordingly to the above-mentioned allowable height of the top plate 2. A and B may be configured to be changed.

Conventionally, this motor 13 for left and right movement is used.
Indicates that the driver circuit 12
The top plate 2 can be freely rotated in the left-right direction without being supplied with any current by being disconnected from the main body. As a result, in these embodiments, even in manual operation, As shown in FIG. 2 and FIG.
The configuration is such that a current for generating a static torque is passed from the apparatus 2, and even if the table 2 is manually moved by this configuration, the danger of collision is eliminated and the safety of the subject 3 is improved. it can.

[0017]

As described above, according to the medical couch of the present invention, when the couchtop is manually moved, the danger of colliding with the gantry can be eliminated and the safety of the subject can be improved. As a result, the safety of the subject is ensured even if the operator does not pay attention to various things, and the burden on the operator is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of one embodiment of the present invention.

FIG. 2 is a block diagram showing a drive system of a movement motor at the time of manual operation in the embodiment.

FIG. 3 is a graph showing a static torque curve in the embodiment.

FIG. 4 is a block diagram showing a driving system of a movement motor at the time of manual operation according to the second embodiment.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 bed 2 top 3 subject 4 gantry 11 controller 12 driver circuit 13 top moving motor 14 top position detecting potentiometer 15 top height detecting potentiometer 16 top moving speed detecting encoder

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61B 6/00-6/14

Claims (1)

(57) [Claims] A top plate which can be switched between automatic and manual, is forcibly moved by a built-in driving means at the time of automatic operation, and is manually movable at the time of manual operation, and detects a height and a horizontal position of the top plate. Detecting means for automatically detecting from the output of the detecting means that the top plate is at a height and a horizontal position at which there is a danger of collision during manual operation, and generating a static torque in the driving means. Control means for controlling the driving means so as to apply a static torque to the board.