JP2002159539A - Bed device for medical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly locate a top plate for placing a patient in a precise position with a small power. SOLUTION: The top plate 3 for placing the patient is vertically movable by a lifting device 7, and the lifting device 7 is formed of an X-arm link mechanism 24 vertically linkable and a lifting screw 47 screwed to a nut 49 the upper end of which is normally and reversely rotatably supported by the X-arm link mechanism 25 and the lower end of which is supported by the X-arm link mechanism 26 to vertically move the X-arm link mechanism 26. The lifting screw 47 is substantially vertically arranged to substantially vertically move the nut 49 by the rotation of the lifting screw 47, whereby a vertical lifting force directly acts on the X-arm link mechanism 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed apparatus for a medical apparatus.

[0002]

2. Description of the Related Art In general, a bed apparatus of a medical apparatus is configured to be movable up and down. For example, in a radiation therapy apparatus, the bed apparatus can be moved up and down so that it can be correctly positioned with respect to the irradiation position of an irradiation head. .

The bed apparatus is supported by an X-arm link mechanism that moves up and down in a horizontal state, and can be moved up and down by driving the X-arm link mechanism by an elevating device. A hydraulic type is known, as disclosed in Japanese Patent Application No. 2-161208.

[0004]

In a hydraulic lifting device, hydraulic pressure is interposed between a position at which the X-arm link mechanism is raised and lowered by a piston rod which expands and contracts by controlling a hydraulic cylinder via an electromagnetic valve. However, since the shock at the start and stop is large and makes the patient feel uncomfortable, there are aspects that are not good at fine speed control and fine adjustment, and a sudden drop due to oil leak occurs over time, There were problems such as maintenance and management being troublesome.

[0005] In recent years, there has been a tendency to arrange a bed apparatus at a low position so that an elderly person with weak feet and waist can easily get on and off. However, if the bed apparatus is arranged at a low position, the arm link of the X-arm link mechanism may be lowered. Because it is folded almost horizontally, a large amount of power is required for initial operation at startup,
This has led to a larger power source.

Accordingly, it is an object of the present invention to provide a bed apparatus for a medical apparatus which solves the above-mentioned problems.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a top plate on which a patient is placed, an upper mechanism for movably supporting the top plate, and An elevating device that supports an upper mechanism so as to be able to move up and down, and a supporting device that movably supports the elevating device, and a bed device of a medical device that includes a lower mechanism portion disposed on a base portion, wherein the elevating device has an X-shape. One of the upper ends of the X arms is fixed to the upper mechanism, and the other is slidably supported, while one of the upper ends of the X arms is constituted by a pair of intersecting left and right X arms.
One of the X arm lower ends is fixed to the lower mechanism, the other is slidably supported, respectively, and an X arm link mechanism, and the upper end is connected to one arm link of the X arm and the lower end is connected to the X arm. Drive means for supporting the other arm link and applying a stretching force in the vertical direction.

[0008] Thus, the X-arm link mechanism can vertically move up and down by applying a vertical expansion and contraction force by the driving means. At this time, even if the X-arm link mechanism is in a folded state, it can be easily raised by the vertical expansion and contraction force.

According to a second aspect of the present invention, the driving means is arranged vertically and has an upper end rotatably supported by one arm link of the X arm and a lower end provided by the other arm link of the X arm. And a vertically-long screw that is screwed up and down with a nut provided on the nut, and a drive unit that applies forward or reverse rotation power to the screw.

[0010] Thus, when the drive section applies forward or reverse rotation power to the lifting screw, the nut screwed with the lifting screw moves up and down along the lifting screw. At the same time, the top plate can be moved up and down by the vertical link movement of the X-arm link mechanism by the arm link integrated with the nut.

In this case, a smooth lifting state of the top plate without shock can be obtained by the lifting screw, and positioning can be performed at a correct position.

On the other hand, at the time of the initial operation of raising the top plate, even if the arm link is folded substantially horizontally,
Since the lifting screw rotates almost vertically, the rotation acts as a push-up force that pushes the X-arm link mechanism directly upward through the nut, so that the top plate can be raised smoothly with a small power source. Become.

According to the third aspect of the present invention, the elevating screws are arranged side by side.

[0014] Thus, the lifting screw works as a strength member on both sides, so that reliable support rigidity is ensured even when the load is biased from above.

According to a fourth aspect of the present invention, a detection mechanism for detecting a vertical movement amount of an upper mechanism corresponding to a rotation amount of a lifting screw in a transmission path for transmitting rotational power from a driving unit to the lifting screw. Incorporate a vessel.

This makes it possible to grasp the amount of vertical movement corresponding to the amount of rotation of the lifting screw. In addition, since it is incorporated in the conduction path, it is possible to obtain an advantage that a dedicated arrangement space for the detector is not required and the drive is achieved. The whole unit can be made compact.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS.

FIG. 5 shows a bed apparatus 1 of a medical apparatus. The couch device 1 includes a couchtop 3 on which a patient is placed and a couchtop 3
Mechanism 5 for movably supporting the device, and upper mechanism 5
And a lower mechanism 11 that is movably supported on the base unit 9 and movably supports the elevating device 7.

An upper mechanism 5 for movably supporting the top plate 3
As shown in FIG. 1, the top plate 3 is composed of an upper table 13 and a lower table 15 which are upper and lower. The top plate 3 can be moved back and forth (arrow a) with respect to the upper table 13 by driving means (not shown). It is supported by.

The upper table 13 is supported by a driving means (not shown) so as to be movable to the left and right (up and down in FIG. 2) with respect to the lower table 15 via a bearing member 17 such as a bearing. Thereby, the top plate 3 can be slid in the front-rear direction and the left-right direction.

The elevating device 7 includes a first arm link 19
a, 19b and a second arm link 21a, 21b are crossed in an X-shape by an arm shaft 23, and a pair of left and right X-arm link mechanisms 25 and driving means 27 are provided. The upper and lower stages are configured so that a large vertical stroke can be secured in the direction.

That is, the upper and lower first and second arm links 19 formed in an X shape by the arm shaft 23
a, 19b, 21a, 21b, the upper end of the upper first arm link 19a is in a state where the sliding movement with respect to the lower table 15 constituting the upper mechanism 5 is restricted by the arm pin 29. It is pivotally mounted.

The lower end of the first arm link 19a is rotatably connected to the upper end of the lower second arm link 21b by a link arm connecting pin 31.

The upper end of the upper second arm link 19b is slidably pivoted along a guide rail 37 of the lower table 15 via a slider 35 supported by an arm pin 33, and is provided with front and rear stoppers. The movement of the slide range is regulated by P1 and P2. The lower end of the second arm link 19b is rotatably connected to the upper end of the lower first arm link 21a by an arm link connecting pin 39.

First and second upper arm links 19
a, 19b and arm link connecting pins 31, 39
The lower end of the first arm link 21a of the lower first and second arm links 21a and 21b pivotally connected via the movable table constitutes the lower mechanism section 11 via the slider 41. Front and back along the 43 guide part 43a (arrow B)
It is slidably pivoted in the direction. The lower end of the second arm link 21b is pivotally connected to the movable table 43 by the arm pin 45 such that the sliding movement of the second arm link 21b is restricted, and the X arm link mechanism 25 has a two-stage structure. ing.

Thus, the top plate 3 can be easily moved on and off.
Is set at a low position, a necessary vertical stroke is secured.

As shown in FIG. 3, the drive means 27 has a nut 49 screwed into a screw portion of a pair of vertically moving screws 47 arranged in the left and right directions in the vertical direction. The rotation power of the forward rotation or the reverse rotation is simultaneously given by the motor 51.

More specifically, a transmission gear 53 is provided on the upper end of the lifting screw 47 and is rotatably supported by the drive case 55, while the lower end of the lifting screw 47 is in a driven case 56 having a nut 49. Penetrates up and down.

As shown in FIG. 3, the transmission gear 53 meshes with a motor gear 57 of the drive motor 51 via an intermediate gear 59 to form a transmission path, and the rotational power of the motor gear 57 is distributed via the intermediate gear 59. The same power is transmitted to the left and right transmission gears 53, 53, respectively.

The drive case 55, the intermediate gear 59 and the drive motor 51 are connected to the left and right second arm links 19 on the upper side.
The upper and lower X-arm link mechanisms 25 are supported by a support bracket 61 supported at both ends of the upper and lower arms 19b and 19b, and move up and down together.

The driven case 56 is supported by the left and right first arm links 21a, 21a on the lower side, and via a nut 49 screwed with the lifting screw 47 when the lifting screw 47 rotates forward or backward. Thus, the upper second arm link 19b and the lower first arm link 21a can move up and down about the link arm.

The drive motor 51 is a motor with an electromagnetic brake, and transmits forward or reverse rotation power to a motor gear 57 via a speed reduction mechanism 63. The number of rotations of the motor gear 57 is determined by, for example, a detector 65 such as an encoder or a potentiometer acting on the transmission gear 53.
The vertical stroke of the top plate 3 corresponding to the rotation speed of the transmission gear 53 is correctly managed.

As shown in FIG. 2, the electromagnetic brake of the drive motor 51 is operated by operating a lever shaft 67 via a control wire 69 to operate an operating portion 71 as shown by an arrow. Is canceled.

Thus, even when an emergency such as a failure in which current is not supplied to the drive motor 51 occurs when the top 3 is raised, the top 3 can be lowered by its own weight.

In this case, a manual operation handle (not shown) may be attached to the gear shaft 59a of the intermediate gear 59 in an emergency, and the top plate 3 may be moved up and down manually by operating the handle of the operation handle. Good.

On the other hand, the lower mechanism section 11 includes the movable table 43 and the support table described above.
3 is supported by the base 75. Movable table 43
Are rotatably supported by 360 degrees via a bearing member 77 such as a bearing.

As shown in FIG. 1, the outer periphery between the upper mechanism 5 and the lower mechanism 11 is covered with a bellows-like cover 79 so that the X-arm link mechanism 25 and the like are not directly visible from the outside. It has become.

According to the bed apparatus configured as described above,
The nut 49 that is screwed with the lifting screw 47 moves up and down along the lifting screw 47 by applying forward or reverse rotation power to the lifting screw 47 by the drive motor 51. At the same time, the first arm link 21a integrated with the nut 49 enables the top plate 3 to be moved up and down by the link motion of the arm link mechanism 25 that expands and contracts up and down. At this time, the up-and-down stroke of the top plate 3 is correctly managed by the detector 65, and a smooth up-and-down state of the top plate 3 without shock is obtained. In addition, positioning can be performed at a correct position, and the detector 65 can be compactly assembled.

On the other hand, during the initial operation of raising the top plate 3, for example, the first and second arm links 19a, 19a
Even if is folded in a substantially horizontal state, the lifting screw 47 rotates in a substantially vertical state. Therefore, the rotation is performed by connecting the first and second arm links 19 a and 19 b via the nut 49 to the arm link connecting pin 39. As a fulcrum, the push-up force is applied to directly push up the X-arm link mechanism 25. As a result, the top plate 3 can be raised smoothly with a small power source.

Further, when the patient is placed on the top 3, even if a biased load acts on one of the top 3, the pair of left and right lifting screws 47
Works as a strength member, so that stable support rigidity can be obtained.

The bed apparatus according to the present invention is typically an X-ray bed apparatus or a CT apparatus, but can be applied to any medical bed apparatus.

[0042]

As described above, according to the bed apparatus of the medical device of the present invention, the following effects can be obtained.

According to the first or second aspect of the present invention, since the vertical expansion and contraction force is applied, the X-arm link mechanism folded substantially horizontally can be smoothly raised by a small power source. At the same time, the top plate can be positioned at the correct position.

According to the third aspect of the present invention, it is possible to make the lifting screw work as a strength member, and it is possible to secure reliable support rigidity.

According to the fourth aspect of the present invention, by incorporating the detector in the transmission path, the entire drive unit can be made compact.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a main part of a bed apparatus of a medical apparatus according to the present invention.

FIG. 2 is a schematic plan view showing a main part of the treatment table.

FIG. 3 is a schematic front view in which lifting screws constituting a lifting device are arranged on the left and right.

FIG. 4 is a schematic side view of FIG. 3;

FIG. 5 is a schematic explanatory view of the entire bed apparatus of the medical apparatus.

[Explanation of symbols]

 3 Top plate 5 Upper mechanism unit 7 Lifting device 11 Lower mechanism unit 25 X arm link mechanism 19a, 19b Upper first and second arm links 21a, 21b Lower first and second arm links 27 Drive unit 47 Lifting screw 49 Nut 75 Base

Claims (4)

[Claims] A top plate on which a patient is placed, an upper mechanism movably supporting the top plate, an elevating device supporting the upper mechanism movably, and movably supporting the elevating device. In a bed apparatus for a medical device comprising a lower mechanism disposed on a base portion, the elevating device is configured as a pair of left and right X arms crossing in an X shape, and one of the upper ends of the X arms is connected to the upper mechanism. An X-arm link mechanism in which one of the X-arm lower ends is fixed to the lower mechanism and the other is slidably supported, and an upper end is fixed to the lower mechanism. A bed apparatus for a medical apparatus, comprising: a driving means for vertically extending and contracting force supported by one arm link of the X arm and a lower end portion of the other arm link of the X arm. 2. The driving device according to claim 1, wherein said driving means is vertically disposed, and has an upper end rotatably supported by one arm link of said X arm and a lower end screwed to a nut provided on the other arm link of said X arm. 2. A bed apparatus for a medical device according to claim 1, comprising a vertically long screw which fits vertically and a drive unit which applies forward or reverse rotation power to said vertically screw. 3. The bed apparatus for a medical device according to claim 2, wherein the lifting screws are arranged in parallel on the left and right sides. 4. A detector for detecting a vertical movement amount of an upper mechanism corresponding to a rotation amount of a lifting screw in a transmission path for transmitting rotation power from a driving unit to the lifting screw. The bed apparatus for a medical apparatus according to claim 2.