JPH02124144A - Medical examination stand - Google Patents

Abstract

PURPOSE:To cause the width size of a top board to be as small as possible and to cause an operator to execute a work in an easy posture by fixing the top board at the time of a top board manual operation in utilizing a rack for feeding in a top board step shape, abolishing a brake and an absorbing plate and causing the width size of the top board to be small. CONSTITUTION:At the time of moving the top board manually, a clutch coil 52 of an electromagnetic clutch 4 is not current-flowing-excited, and a pinion shaft 16 and the output shaft of a motor 6 are not connected. When the operator pushes an operation switch 17 and, simultaneously, holds and operation handle 14, a brake coil 54 of an electromagnetic brake 3 is current-flowing-excited, and a brake armature 55 is separated from a permanent magnet 53. For such a reason, the rotation fixation of the pinion shaft 16 is released, and when a top board 1 is moved in an arbitrary direction, a rack 2 fixed to a top board frame 11b and the pinion shaft 16 are rotated. A subject is positioned in a prescribed position, thereafter, the operator separates the hand from the operation handle 14, then, the operation switch 17 is automatically returned to an OFF-position, the pinion shaft 16 is made unrotatable, the rack 2 cannot be moved, and thereby, the top board is fixed in such a position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an examination table for an X-ray image diagnosis system for the circulatory system, and particularly to an examination table with improved operability.

[Conventional technology]

Generally, in image diagnosis of the circulatory system, the patient is positioned by placing the patient on the top of an examination table and moving the top to a predetermined fluoroscopy and imaging position.

Normally, this movement of the top plate is performed manually by the operator, but in the case of diagnosis of blood vessels in the lower extremities, X-rays are taken to capture the flow of contrast medium injected into the blood vessels from near the thigh toward the end of the foot. In order to do this, it is necessary to move the top board in steps,
At this time, only the top plate is moved by a motor drive system.

Usually, an electromagnetic clutch is mechanically connected to this top plate step feed motor, and the clutch and the top plate are connected through a mechanism such as a rack and pinion that converts rotational motion into linear motion. That is.

When manually operating the top plate, the connection between the top plate and the motor is separated by disengaging the clutch, while when moving the top plate electrically by the motor, the clutch is connected, and the motor is started and stopped using a signal from a position detector and a control circuit. The control allows the top plate to move in steps.

By the way, for safety reasons, the top plate of this type of examination table is designed to remain fixed even when the power is turned off, and this is usually achieved by installing an iron suction plate on the top plate. , A permanent magnet with a coil wound around it is installed on the supporting base side of the examination table, and the magnetic force of the permanent magnet attracts and fixes the suction plate of the top plate.When the top plate is moved, the magnetic force of the permanent magnet is applied by the electromagnetic force of the coil. A method is used to release the suction fixation of the large plate by erasing it. An example of such a method for fixing a top plate is Utility Model Application No. 145507/1983.

[Problem to be solved by the invention]

As mentioned in 1, conventional examination tables are equipped with a drive mechanism for moving the top plate in a step-like manner and a mechanism for fixing the top plate. Among these mechanical parts, the top plate The rack for step feeding and the suction plate for fixing the top plate were attached to the underside of the top plate. However, as is well known, in order to obtain good X-ray photographs, the top plate is made of a material with excellent X-ray transparency, and a rack or suction plate is placed in the X-ray irradiation field below the top plate. Then, the image appears on the X-ray photograph, which interferes with diagnosis.

Therefore, in the conventional apparatus, as shown in FIG. 5 (I3), in order to transfer a good X-ray photograph of the subject 20 onto the film 3 in the film changer 30 installed under the top plate 1, The suction plate 40, which is suctioned and fixed to the brake 41 fixed to the rack 2 and the support base 8, is provided near the side edge of the top plate outside the X-ray irradiation area, and the width of the top plate is A method was established that included these parts.

However, when a patient is placed on an examination table, a catheter may be inserted to administer a contrast agent into the canal, or a surgical procedure may be performed, so the width of the top plate is wide. However, there were problems in terms of operability, such as the operator having to bend over during these operations, and feeling deeply fatigued if the operator continued to work for a long time.

SUMMARY OF THE INVENTION An object of the present invention is to provide an examination table with excellent operability, in which the width of the top plate is made as small as possible, allowing the operator to work in a comfortable posture.

[Means to solve the problem]

The above objective is achieved by fixing the top plate during manual operation using a rack for feeding the top plate in a stepped manner, eliminating brakes and suction plates, and reducing the width of the top plate. be able to.

[Effect]

The examination table is equipped with a switch for selecting a top plate step feed operation, a rack is fixed to the top frame supporting the top plate on which the patient is placed, and the rack is engaged with the rack on the support side of the examination table. A pinion is provided, and a non-excited electromagnetic brake and an electromagnetic clutch are provided on the same axis, and a motor for driving the top plate step feed is provided, and its output shaft and the electromagnetic clutch are mechanically connected.

When manually operating the top plate, the electromagnetic clutch is disconnected to separate the connection between the motor and pinion shaft, and when the top plate is moved, the electromagnetic clutch is disconnected.
The rotation of the pinion shaft is unlocked by the nozzle, and when the top plate is fixed, the rotation of the pinion shaft is locked by the electromagnetic brake, preventing movement of the rank that engages with the pinion, thereby fixing the top plate in that position.

When the operator selects step-like feeding of the top board using the selection switch, the selection signal connects the electromagnetic clutch to connect the motor and the pinion shaft, and at the same time releases the rotation lock of the pinion shaft by the electromagnetic switch. , the top plate is electrically moved by a motor via the pinion and rack.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Generally, as shown in Fig. 2, an examination table has top frames 1.1a and llb on both sides of a top plate 1 on which a patient is placed, and these are supported by a support frame 8 in the direction of the circular arrow. movably supported. Further, the top plate frame 11a, 1-L
An operation handle 14 is provided on one side of the top plate 1, and the operator uses this handle to move the top plate.
Position the subject placed on top. In a normal examination table, the top plate is made of a material with excellent X-ray transparency, and when carrying out an X-ray examination with a patient on it, the
The configuration is such that no components other than the top plate 1 are present in the range that will become the radiation irradiation field so that no image appears on the X-ray photograph that would impede diagnosis.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. On the side surfaces in the width direction of the top plate 1 on which the subject 20 is placed, there are top plate frames 11a and 11b having a cross-sectional shape consisting of a recess for inserting the top plate and another recess for functioning as a guide rail. Fixed. One side of this top plate frame 1
An operation handle 14 for manually operating the top plate is fixed to 1b, and an operation switch 17 is provided on the handle 14 to fix and release the top plate when manually moving the top plate. be. This operation switch 17 has
The switch is ON only while it is pressed, and when you release the switch it automatically returns to the OFF position.

A rack 2 is fixed to the top plate frame 11b so that its longitudinal direction coincides with the longitudinal direction of the top plate, and a cam 10 is fixed to the other top plate frame 11a.

A support stand 8 is provided on the lower side of the top plate 1, and this is fixed to the upper end of a column 18. A plurality of guide rollers 13a are provided on both sides of the support base 8.

13b is fixed so that the outer diameter of the roller fits into the concave rail portion of the top plate frame 11a, llb, and on both sides of the support base 8, a plurality of other guide rollers (not shown) are installed. The top plate frames 11a and llb are fixed so as not to move in the width direction of the top plate 1.

These guide rollers allow the top plate 1 to move around the top plate frame 11a,
llb, and is supported by a support base 8 so as to be movable in its longitudinal direction.

A pinion 12 fixed to a pinion shaft 16 is engaged with the rack 2, and an electromagnetic brake 3 and an electromagnetic crack 4 attached to the support base 8 are connected to the pinion shaft 16.
The electromagnetic clutch 4 is rotatably held on the support base 8 by a bearing provided inside the electromagnetic clutch 4 and a bearing 21 provided on the support base 8.

FIG. 4 is a diagram showing the connection between the pinion shaft 16, the electromagnetic brake 3, and the electromagnetic clutch 4.

In the electromagnetic clutch 4, the rotor 51 is connected to the pinion shaft 1.
A clutch armature 50 with a leaf spring 58 attached thereto is provided on the motor 6 side of the rotor 51, and is spline-coupled to the armature hub 57 so that it can be moved minutely in the longitudinal direction of the pinion shaft 16. has been done. A connecting shaft 56 is fixed to the armature hub 57 with a bearing 59b in between, and the connecting shaft 56 is connected by a coupling 5 to an output shaft of a motor 6 provided on a support base 8. On the other hand, a bearing 59a rotatably holds the pinion shaft 16 on the fixed side of the electromagnetic clutch 4.
A clutch coil 52 is provided. When this clutch coil 52 is not energized and excited, the clutch armature 50 is pulled toward the armature hub 57 by the spring force of the leaf spring 58 and is not in contact with the rerotor 51 . When the clutch coil 52 is energized and excited, the electromagnetic force attracts and fixes the clutch armature 50 to the rotor 51 against the spring force of the leaf spring 58, and this connection causes the pinion shaft 16 and the connection shaft 56 to rotate simultaneously. will begin to do this.

On the other hand, the electromagnetic brake 3 is of a non-excited type that operates when the power is cut off, and in this embodiment, a type that applies braking to rotational motion using the magnetic force of a permanent magnet is used. That is, the brake hub 60 is attached to the pinion shaft 16.
is fixed to the hub 60, and a brake armature 55 is attached to the hub 60 via a plate spring (not shown) so that it can be moved slightly only in the longitudinal direction of the pinion shaft 16.

A permanent magnet 53 and a brake coil 54 are provided on the fixed side of the electromagnetic brake 3. When this coil 54 is not energized, the brake armature 55 is attracted and fixed by the magnetic force of the permanent magnet 53, so that the brake hub The rotation of the pinion shaft 16 is fixed via the pinion shaft 60. On the other hand, when the coil 54 is energized and excited, the electromagnetic force acts to eliminate the magnetic force of the permanent magnet 53, so the connection between the brake armature 55 and the permanent magnet 53 is released, and the brake hub 60 is connected to the pinion shaft 16. Can be rotated at the same time.

An encoder 7 for detecting the motor rotation angle is attached to the motor 6, and a top plate step feed operation selection button -5 and a micro switch 9 are attached to the support base 8. ing.

This switch 9 is the star 1 whose top plate moves in steps.
- The cam]-0 is arranged so as to push the actuator of the switch 9 when it reaches the point.

Next, the operation of this embodiment will be explained.

When moving the top plate manually, the clutch coil 52 of the electromagnetic clutch 4 is not energized and therefore the pinion shaft 6 and the output shaft of the motor 6 are not connected.

While pressing the operation switch 17, the operator turns the operation handle 1-
4, the brake coil 54 of the electromagnetic brake 3 is energized and excited by the operation signal of the switch ]-7, and the brake armature 55 is separated from the permanent magnet 53. Therefore, the fixed rotation of the pinion 4i11116 is released, and when the operator moves the top plate 1 in any direction using the operating handle ]-4, the rack 2 fixed to the top frame], 1b,
A pinion shaft 1G rotates via a pinion 1-2 meshing with each rack 3.

After positioning the subject in a predetermined position, when the operator releases the hair from the operating handle 14, the operating switch 17 is automatically turned off.
When the pinion shaft 16 returns to the F position, the power supply to the brake coil 54 is cut off and the brake armature 55 is attracted and fixed by the permanent magnet 53, so that the pinion shaft 16 becomes unable to rotate. Therefore, since the rack 2 meshing with the pinion 12 cannot be moved, the top plate is fixed in that position.

FIG. 3 is a diagram for explaining the operation of the top plate step-feed movement, and the operation during the top plate step-feed movement will be explained with reference to this figure.

After completing the pre-X-ray imaging work such as inserting a catheter for contrast medium injection into the subject 20 placed on the top plate 1,
When the operator presses the selection button ]-5, the clutch coil 52 is energized and excited by this signal, and the output shaft of the motor 6 and the pinion shaft 16 are mechanically connected. Thereafter, when the operator presses a set switch on the operating table (not shown), the motor 6 rotates and the top plate 1 moves via the pinion ]2 and rack 2 to the position where the cam ]0 pushes the actuator of the micro switch 9. , the rotation of the motor 6 is stopped by a signal from the microswitch 9. This is the star 1 point of stepwise feeding, and at this position the film changer 30 is placed at the bottom of the top plate as shown in FIG. The positional relationship between the film changer 30 and the top plate 1 in the width direction of the top plate is as shown in FIG. 5(A).

When the operator presses a start switch on the operating table (not shown), contrast imaging is performed from the vicinity of the thigh into the blood vessels of the lower limbs of the subject 20 through the inserted catheter in accordance with a preset system control sequence. The agent is injected, X-rays are irradiated within the range of angle θ in FIG. 3, and an X-ray photograph is taken on the film 31 in the film changer 30.

After that, in order to follow the flow of the contrast medium in the blood vessels, the top plate 1-
The film changer 3o repeats automatically moving and stopping in steps by the two dimensions shown in the figure, and the film changer 3o moves in response to the movement.
The film 31 inside is also replaced with a new unexposed film, and X-ray photography is performed at each stop position. The step movement of the top plate here is performed by detecting a signal from an encoder 7 provided on the motor 6 and controlling the motor rotation by a control circuit.

The feed amount P per step of the top plate is generally determined by the average height of the subject and the film size, and the time required to repeat the step movement is determined by the average blood flow velocity in the blood vessels of the lower extremities. In the example, the feed amount P is approximately 2
The fourth lesson is movement.

The stop is repeated four times at approximately 2 second intervals.

Although the present invention has been specifically explained above based on the embodiments, for example, the rack 2 and pinion]-2 may be replaced with a toothed belt and a toothed pulley, and linear motion and rotational motion can be converted by that mechanism. good.

〔Effect of the invention〕

According to the present invention, since the examination table is constructed and operated as described above, it is possible to fix and release the fixation of the top plate when manually moving the top plate using the drive mechanism for step-like movement of the top plate. Since the width dimension of the handle can be reduced, the operator can perform X-ray diagnostic work such as inserting a catheter into the patient in a comfortable posture, improving operability. This also has the effect of increasing diagnostic efficiency.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the configuration of an examination table according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a diagram for explaining the step-like movement of the top plate, and Fig. 4 is A sectional view for explaining the operation of the electromagnetic clutch and the electromagnetic brake, FIG.
5(B) is a diagram illustrating a conventional example. FIG. 1... Top plate, 2... Rack, 3... Electromagnetic brake, 4... Electromagnetic clutch, 5... Coupling, 6...
...Motor, 7...Encoder, 8...Support stand, 9
...Micro switch, 10...Cam, lla, l
lb...Top plate frame, 12...Pinion, 13a, 13
b...Guide roller, 14...Operation handle, 15
... Selection button, 16... Pinion shaft, 17... Operation switch, 18... Support column, 20... Subject, 21...
・Bearing, 30... Film changer, 31... Film, 4o... Adsorption plate, 41... Brake, 50
...Clutch armature, 51...Rotor, 52
...Clutch coil, 53...Permanent magnet, 54...
・Brake coil, 55...brake armature,
56... Connection shaft, 57... Armature hub, 58
...Plate spring, 59a, 59b...Bearing, 60...
brake hub. Meguchi 20 Meguchi 3 Figure 4 - Mouth

Claims (1)

[Claims] 1. In an examination table comprising a fixed support stand and a movable top plate on the support stand, the top plate can be moved either manually or electrically. An electric motor and a rotating shaft are provided, a rotating brake is provided on the rotating shaft, and an appropriate transmission mechanism is provided to convert the rotational motion of the rotating shaft into linear motion of the top plate, and the electric motor and the rotating shaft are connected to each other by a clutch. The top plate is connected through the crack, and the top plate is switched between manual and electric operation by the operation of the crack, and the movement of the top plate is fixed by braking the rotation of the rotating shaft with the rotary brake. A medical examination table.