JPH06165776A - Driving mechanism for photographing table for ct - Google Patents

Abstract

PURPOSE:To set easily the height and the horizontal position by means of an operational button by a mechanism wherein one of the apex end parts of the lower side of an X-shaped arm supporting a photographing table is fixed and another one is horizontally movable and one of the apex parts of the upper side is freely movable horizontally and another one is linked with the table. CONSTITUTION:Shafts 24-27 crossing at right angle to the paper face are provided on apex parts of an X-shaped arm 22 supporting a photographing table 2 on a setting stage 20. The shaft 24 is fixed 23 on the setting stage 20 and the shaft 25 is movable horizontally in a guide 28. The shaft 27 is connected to the table 2 by means of a cam 32 to link with the table 2 and the shaft 26 is freely movable in a guide 29. The table 2 is elevated by means of the X-shaped arm 22 and a hydraulic actuator 21. The table is elevated from the original position of the figure and the shaft 26 is fitted into a cam 31. When the table 2 is additionally elevated, the shaft 27 is disconnected from the cam 32 and only height becomes variable. The height and the horizontal position of the table can be set easily by means of an operational button.

Description

Detailed Description of the Invention

[0001]

The present invention relates to CT (computed tomogr
aphy) for the shooting table drive mechanism.

[0002]

2. Description of the Related Art First, a part of a CT imaging procedure will be briefly described. FIG. 4 is a diagram for explaining a CT imaging procedure. In the figure, 1 is a scanning gantry having a built-in X-ray imaging apparatus, 2 is an imaging table having a double structure in which an upper part slides, and 3 is an imaging table. The drive mechanism, 4 is a patient, and 5 is instruments such as a signal cable. At the start of photographing, the height of the photographing table is the height H ₁ (about 400 mm) shown in FIG. 4A so that the patient can easily get on it.

Then, with the patient lying on the table, the table is brought as close as possible to the scanning gantry, and the height of the table is raised so that the patient is positioned at the center of the scanner opening (shown by the dotted line) of the scanning gantry. This state is shown in FIG. That is, the height of the table is set to H ₂ (about 800 mm), and the table is moved in the horizontal direction so as to narrow the space between the table and the scanning gantry (W ₁ → W ₂ ). It is necessary to move only the patient so as not to disturb the tilt movement of the scanning gantry, and to attach instruments such as the signal cable 5 to the patient, and to save time for the next procedure and to perform stable operation. This is because.

Next, the upper part of the table is slid (moved horizontally) to bring the patient's imaged part to a predetermined position of the scanner opening. This state is shown in FIG. Then, the height of the table should be h according to the individual patient.
Finely adjust within the range of (about 250 mm). This is because, for example, the height of the region to be imaged is different depending on whether the patient is a child or a fat patient, so that the imaging is started after correcting the height. Further, when photographing a plurality of parts, it is necessary to finely adjust the height of the table according to the height of each part and bring the part to be imaged to the center of the scanner opening before imaging.

As described above, the imaging table in CT imaging is moved from the position on which the patient sits (H ₁ , W ₁ ) to the position (H ₂ , W ₂ ) that has a predetermined height and is close to the scanning gantry. Moreover, it is necessary to finely adjust the height at that position. The shooting table drive mechanism 3 automatically performs such an operation.

FIG. 5 is a diagram showing an example of a conventional photographing table drive mechanism (hereinafter referred to as a device), which is configured to be driven by using an H-shaped arm 11 and a hydraulic actuator 12, and the table 2 is shown in FIG. From the state shown in FIG.
An arc is drawn to move to the state shown in (B) as indicated by a white arrow. This device has the advantage of being relatively simple to construct, but does not allow adjustment of the height of the table alone. That is, the table is designed to move in an arc, and when the height is adjusted, the position in the horizontal direction always changes, so that there is a drawback that the imaged part once determined changes.

FIG. 6 is a view showing another example of a conventional photographing table drive mechanism. As shown in FIG. 6B, the movement in the height direction is performed by an X-shaped arm 13, a guide 14 and a hydraulic actuator 12a. 6C, the horizontal movement can be performed independently by the combination of the sliding base 15 and the hydraulic actuator 12b, as shown in FIG. 6C. The adjustment does not change the horizontal position.

[0008]

As described above, the conventional photographing table drive mechanism as described above has a drawback that the position in the horizontal direction changes in the apparatus shown in FIG. 5 when the height is adjusted. There is. Further, in the apparatus shown in FIG. 6, only height adjustment can be performed independently, but movement in the height direction and movement in the horizontal direction cannot be performed at the same time. That is, as described with reference to FIG. 4, there is a demand to move the table immediately from the initial position (H ₁ , W ₁ ) to the intermediate position (H ₂ , W ₂ ) shown in FIG. 4B. Nevertheless, this cannot be done in one operation. Further, the apparatus shown in FIG. 6 has a problem that the structure itself is complicated and the cost is high.

The present invention has been made in order to solve such a problem, and the table can be moved to an intermediate position by one operation, and the subsequent fine adjustment in the height direction can be continuously performed without the horizontal movement. It is an object of the present invention to provide an imaging table drive mechanism that can be operated by a simple and inexpensive structure.

[0010]

A photographing table driving mechanism according to the present invention comprises an installation table (20) and a photographing table (2).
And an X-shaped arm (22) having shafts (24) to (27) at each end and supported and driven by a hydraulic actuator (21), and a mounting table (20) for the X-shaped arm (22). ) Side two shafts (24), one (24) of (25) is fixed at a predetermined position of the installation base (23), and the other one can be moved horizontally on the installation base (20). As described above, the first means for mounting on the first guide (28) and the two shafts (26) and (27) of the X-shaped arm (22) on the side of the imaging table (2) are horizontally limited to a predetermined range. A second guide (29) and a third guide (29) are provided so as to be movable.
Second means to be mounted on the guide (30) of the above, when the shaft moved from one direction comes into contact with and is pushed, it is fitted and held, and the held shaft is moved in the opposite direction. A cam (3) that releases the grip when it is pressed with a certain pressure or more.
1), 32 to the second guide 29 and the third guide
The third means provided at a predetermined position of the guide (30) and the arm of the hydraulic actuator (21) are extended by a predetermined distance to move the imaging table (2) in an arc shape by the first to third means. The first movement stage for simultaneously performing the position movement in the height direction and the horizontal direction, the hydraulic actuator (2
It is characterized in that it further comprises a second movement stage in which the arm of 1) is further extended in a continuous manner to move only in the height direction.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the configuration of the present invention. In the figure, 2 is an imaging table, 20 is an installation stand, 21 is a hydraulic actuator, 22 is an X-shaped arm having a pivotal connecting portion at the center, Shafts 24 to 27 are provided at the respective ends.
Is provided. Reference numeral 23 is a fixed base for fixing the shaft 24 to the installation base 20 in a rotatable state, and 28 to 30 are guides for sliding the shafts 25 to 27 in the horizontal direction. Reference numeral 31 is a cam attached to one end of the shaft 29, 32 is a cam attached to one end of the shaft 30, and the guides 29, 30 and the cams 31, 3 are provided.
2 has the same shape.

FIG. 2 shows the cam 31 (or 3) shown in FIG.
FIG. 2 is a diagram for explaining the configuration and operation of 2), in which the cam is pressed against the pressure of the spring 33 when the shaft 26 moved from one direction (in the drawing, the right direction in the drawing) comes into contact and pushes the cam 31. Then, the shaft 26 is fitted and gripped. Further, the gripped shaft 26 is maintained as it is when the force in the opposite direction is small as shown in FIG. 2A, but as shown in FIG. Then, the spring 33 is rotated against the pulling force of the spring 33 to release the grip.

Next, the overall operation will be described with reference to FIG. In the initial position where the length of the protruding arm of the actuator 21 is the shortest, as shown in FIG. 3A, the shaft 25 and the shaft 26 can freely move horizontally, and the shaft 27 and the cam 32 can move freely. And the photographing table 2 moves in accordance with the movement of the shaft 27. Therefore, when the protruding arm of the actuator 21 is extended in this state, the imaging table 2 moves diagonally upward in a circular arc as shown by the dotted arrow in FIG.
_2. Shaft 26 when horizontal movement distance (L) is reached
Is fitted to the cam 31, and the shaft 26 cannot freely move horizontally. This position is the intermediate position. As described above, the reason for moving the imaging table 2 closer to the gantry by moving it in an arc is that it is convenient for the patient to easily get in and out of the gantry if the table is far from the gantry main body, and because the patient moves back and forth at the same time as moving up and down. In addition, it is necessary to provide a certain distance between the gantry body and the table mounting base due to the fact that the patient's movement time to the inspection position can be shortened and the relationship between the tilt mechanism of the gantry body and the attachment position of accessories is necessary. This is because without exercise, the total length of the table must be long and the slide amount of the table top must be large, and the weight of the table must be increased, resulting in deterioration of mechanical strength and high cost.

When the protruding arm of the actuator 21 is further extended, a force is applied to the shaft 27 by the operation of closing the opening angle of the X-shaped arm 22, and the shaft 27 is released from the fitting of the cam 32, as shown in FIG. 3 (C). It becomes a state. In this state, since the shaft 25 and the shaft 27 on one side can freely move horizontally, even if the protruding arm of the actuator 21 further extends, the photographing table 2
Does not change its horizontal position, only its height position. Needless to say, the operation opposite to the above operation is performed by driving the actuator 21 in the opposite direction and contracting the protruding arm.

[0015]

As described above, the photographing table drive mechanism of the present invention moves the photographing table in an arc shape up to the intermediate position, and then makes subsequent fine adjustments in the height direction without horizontal movement. There is an effect that the operation can be performed by one operation of the hydraulic actuator, and the operator can move the patient according to the purpose by one button operation of up and down.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining the configuration and operation of the cam shown in FIG.

FIG. 3 is a diagram showing the overall operation of the embodiment.

FIG. 4 is a diagram for explaining a CT imaging procedure.

FIG. 5 is a diagram showing an example of a conventional imaging table drive mechanism.

FIG. 6 is a diagram showing another example of a conventional imaging table drive mechanism.

[Explanation of symbols]

 2 Photography table 20 Installation stand 21 Hydraulic actuator 22 X type arm 23 Fixed stand 24-27 Shaft 28-30 Guide 31, 32 Cam

Claims (1)

[Claims] 1. A CT (computed tomography) imaging in which an imaging table is lifted from an initial position to a predetermined height and horizontally moved in the direction of a scanning gantry to an intermediate position, and movement in the height direction is performed at this intermediate position. In a table drive mechanism, an X-shaped arm (22) having shafts (24) to (27) at each end between an installation table (20) and an imaging table (2) and supported and driven by a hydraulic actuator (21). ) Is provided, and one of the two shafts (24) and (25) of the X-arm (22) on the installation base (20) side of the scanning gantry (1) side is fixed to a predetermined position of the installation base. (23), a first means for mounting the other on the first guide (28) so as to be horizontally movable on the installation table (20), and a photographing table of the X-shaped arm (22). Two shafts (26) on the (2) side Each 27 a so as to be movable by a predetermined length in the horizontal direction each second guide (2
9), a second means to be attached to the third guide (30), when the shaft moving from one direction comes into contact and is pushed, this shaft is fitted and gripped, and also gripped. Cams (31), (32) that release the grip when the shaft is pushed in the opposite direction by a force of a certain pressure or more are provided at predetermined positions of the second guide (29) and the third guide (30). Third means, by extending the arm of the hydraulic actuator (21) by a predetermined distance, the photographing table (2) is moved in an arc shape by the above-mentioned first to third means to move the position in the height direction and the horizontal direction. Simultaneously performed, a first moving stage in which the photographing table is set to the intermediate position, and a second moving stage in which the arm of the hydraulic actuator (21) is further extended continuously to perform only the moving in the height direction, CT imaging table characterized by Drive mechanism.