JPH069675Y2 - Tube clamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tube clamp that is used as a safety device for hemodialysis and that blocks a tube to stop the flow of liquid.

(Prior Art) Conventional tube clamps are roughly classified into two types.
In the first method, as shown in FIG. 5, when the coil of the rotary solenoid 11 is excited, the crushing tool 13 connected to the shaft of the rotary solenoid 11 by the connecting shaft 12 is rotated and held by the block 14. Tube 15 is a crushing tool 1
3 and the block 14 are crushed and crushed to be in a closed state. Alternatively, when the coil of the push-pull solenoid 16 is excited as shown in FIG. 6, the crushing tool 17 is pushed by the iron core of the push-pull solenoid 16, and the tube 15 held by the crushing tool 17 in the block 14 is received by the block 14. The part 18 is pressed and crushed.

In either case, the solenoid 1 is used to continuously close the valve.
The closed state is maintained by continuing to excite the coils 1 and 16. In any case, in order to return to the open state, when the excitation of the coils of the solenoids 11 and 16 is stopped,
In FIG. 5, the crushing tool 13 is rotated in the reverse direction by the return spring 19, and in FIG. 6, the crushing tool 17 is retracted by the spring 21 and the tube 15 is released.

The second conventional method is as shown in FIG.
When the coil of No. 2 is excited, the lock bar 23 is pulled in and disengaged from the lock groove 24 of the crushing tool 17, and the crushing tool 17 is moved to the spring 2
It is pushed by 5 to push the tube 15 against the receiving portion 18 of the block 14. In order to return to the open state, the crushing tool 17 moves against the spring 25 by pushing in the manual return means 26 provided in the block 14, and the lock groove 2
When 4 comes to the position of the lock bar 23, the lock spring 23 enters the lock groove 24 by the return spring 27, and the position of the crushing tool 17 is locked.

(Problems to be Solved by the Invention) The first method has the following problems.

(1) Power is increased by continuing to excite the solenoid coil and keeping the tube closed.

(2) By continuing to excite the solenoid coil, the heat generated by the coil will affect the surrounding parts.
If heat is transferred to the tube, there is a risk of blood in the tube clotting.

(3) As a measure against coil heat generation by continuing to excite the coil of the solenoid, add a circuit that enlarges the coil, installs a radiator, or switches the voltage applied to the coil when maintaining a closed state. However, it becomes large and complicated.

(4) A large solenoid is required because more force than the tube crushing force is required.

The second method has the following problems.

(1) The structure becomes complicated and it is easy to cause a failure.

(2) The solenoid for releasing the lock requires almost the same force as in the first method, and cannot be downsized.

(Means for Solving the Problem) The present invention utilizes a holding means of a solenoid having a permanent magnet as a means for holding a tube crushing tool in an open state, and a spring and a spring provided in the crushing tool as a means for crushing a tube. A power source that supplies pulsed electric power for releasing the holding force of the solenoid is used, and a returning means for returning the crushing tool to the holding position is provided.

Therefore, no mechanical holding means is required and the structure is simple. Further, to energize the coil of the solenoid, it is sufficient to cancel the holding force of the permanent magnet in order to release the holding, and the energizing time may be about 10 msec. Therefore, it does not cause heat generation. The solenoid has a volume ratio of less than half that of conventional solenoids and can be miniaturized.

(Operation) Due to the holding force of the solenoid having the permanent magnet, the iron core of the solenoid is at the retracted position, the tube crushing tool connected to the iron core is held at the predetermined position, and the tube is in the open state. When closing the tube, by supplying pulsed power to the coil to release the holding force of the solenoid, the spring provided in the tube crushing tool moves the crushing tool and the iron core of the solenoid in the tube direction, Crush. Further, when the tube is opened, the iron core of the solenoid is manually pushed back to a predetermined position by the returning means, the iron core is held by the attraction force of the permanent magnet of the solenoid, and the tube is opened.

(Embodiment) FIG. 1 and FIG. 2 show a first embodiment of the present invention. The block 14 holds the tube 15 and contacts the side surface of the tube 15 or approaches the side surface of the tube 15, and the block 14 receives the receiving portion 1.
8 are provided. The receiving portion 18 through the tube 15
A crushing tool 17 is provided on the block 14 so as to face and to move back and forth. Further, the block 14 is provided with a manual return button 31 in parallel with the crushing tool 17. The crushing tool 17 is pushed toward the receiving portion 18 and the tube 15
A spring 32 for crushing is provided. The end of the crushing tool 17 opposite to the receiving portion 18 is connected to the iron core 34 of the solenoid 33 having a permanent magnet by a connecting shaft 35. Further, the connecting shaft 35 is provided with a manual return arm 36. The solenoid 33 having a permanent magnet has a permanent magnet inside, and in a state where the iron core 34 is retracted, the iron core 34 comes into contact with the permanent magnet to be attracted and held, and the coil is excited so as to cancel the holding force. 34 is projected.

Further, in the coil of the solenoid 33 having a permanent magnet,
A power supply (not shown) that supplies pulsed power is connected.

The crushing tool 17 is separated from the receiving portion 18 in a state where the iron core 34 of the solenoid 33 having a permanent magnet is drawn and attracted to the permanent magnet, and the tube 15 is held in a non-crushed state.

When closing the tube 15, the holding force of the solenoid 33 having a permanent magnet is released by supplying pulsed power to the coil of the solenoid 33 having a permanent magnet, and the coil 32 is crushed by the spring 32 provided in the crushing tool 17. The tool 17 and the iron core 34 move in the direction in which the tube 15 is crushed, and crush the tube 15 into the receiving portion 18. The tube 15 is closed by the spring 32.

Further, in order to return the tube to the open state, by pushing the manual return button 31, the manual return arm 36 provided on the connecting shaft 35 moves around the fulcrum shaft 37 and the crushing tool connected by the connecting shaft 35. 17 and the iron core 34 move toward the solenoid 33 having a permanent magnet, and when the iron core 34 reaches a predetermined position, the iron core 34 is attracted to the permanent magnet and the open state is maintained.

A second embodiment of the present invention is shown in FIGS. 3 and 4. When the tube 15 is closed, pulsed power is supplied to the coil of the solenoid 33 having a permanent magnet to release the holding force of the solenoid 33 having a permanent magnet. Therefore,
The crushing tool 13 and the rotating fitting 38 are provided by a spring 39 provided between the rotating fitting 38 provided on the crushing tool 13 and the block 14.
The iron core 34 connected by the connecting plate 41 moves counterclockwise to close the tube 15.

Further, in order to return the tube 15 to the open state, the manual return means 42 provided in the crushing tool 13 is rotated in the clockwise direction so that the iron core 34 connected to the rotary fitting 38 is moved toward the solenoid 33 having a permanent magnet. Move to, iron core 34
When reaches the predetermined position, the iron core 34 is attracted to the permanent magnet and the open state is maintained.

(Effect of device) As described above, according to this device, when the tube is kept open by the attraction force of the solenoid having the permanent magnet, and when the tube is closed, the pulsed electric power for releasing the attraction force is instantaneously applied. The supply closes the tube with a spring. Also, as a means for returning to the open state, as a means for manually moving the iron core connected to the tube crushing tool to a predetermined position, by pushing back or rotating the crushing tool, the iron core is attracted to and retained by the permanent magnet. ,
Open the tube. Therefore, there are the following effects.

(1) Power consumption can be reduced.

(2) It is safe because the coil generates less heat.

(3) The coil can be downsized.

(4) The structure is simple and there are few failures.

[Brief description of drawings]

1 is a perspective view showing a first embodiment of the tube clamp of the present invention, FIG. 2 is a side view of FIG. 1 with a partial cross section, and FIG. 3 is a second embodiment of the tube clamp of the present invention. The front view shown in FIG. 4 is a plan view of FIG.
FIGS. 6, 6 and 7 are side views showing a conventional tube clamp.

Claims (1)

[Scope of utility model registration request] 1. A tube used for hemodialysis is closed,
In a tube clamp for stopping the flow of liquid, a holding solenoid having a permanent magnet, a spring for drawing out the iron core of the holding solenoid, a means for crushing the tube by the spring, and a returning means for returning the iron core to the holding position. A tube clamp having a power source for supplying pulsed electric power to the holding solenoid to release the holding solenoid.