JP4549359B2 - Tube pump - Google Patents

Description

  The present invention relates to a roller-type tube pump mounted on an artificial dialysis machine or the like.

JP 2006-304918 A

Even with a general-purpose tube pump, as seen in the above-mentioned patent document, various improvements have been proposed for the means for grasping the liquid feeding situation, and each has achieved a predetermined effect. There is no doubt that there is a lot of room for improvement.

Moreover, what is equipped with a tube external shape change detection sensor is known as both well-known conventional structures in the upstream and downstream of a roller rolling press part.

In order to detect the completion of the supply of the liquid in the supply bag in the system that feeds the liquid that has entered the supply bag with a tube pump, for example, an external shape change detection sensor is arranged on the suction side (upstream side), and the supply bag Since the tube is deformed by the negative pressure in the tube that is generated upstream when the supply of the liquid in the inside is completed, a configuration that detects that the supply bag has ended by detecting this is also put into practical use. Yes.

In order to monitor the blockage of the tube on the downstream side of the tube pump, for example, when an external shape change detection sensor is installed and the blockage occurs on the downstream side of the tube pump, the tube Some of them are deformed so that the sensor detects this to detect the blockage.
In addition, this external shape change detection sensor may be provided for the purpose of tube set detection.

The tube pump according to the present invention is a tube pump configured to transfer the liquid in the elastic tube by the rolling press of the roller, and includes a tube external shape change detection sensor on the downstream side of the roller rolling press, and the tube The signal of the external shape change detection sensor is configured to be a supply end detection means of the liquid in the supply bag, or

Along with the signal from the tube outer shape change detection sensor, the current waveform of the drive motor can be used as a supply end detection means for the liquid in the supply bag.

The synchronous change between the signal of the tube outer shape change detection sensor and the current waveform of the drive motor is configured to be a liquid supply end detection means in the supply bag, or

The threshold value for determining the end of the supply of the liquid in the supply bag based on the signal from the tube outer shape change detection sensor can be arbitrarily set according to the operating speed of the tube pump.

The present invention makes it possible to detect the end of the supply of the liquid in the supply bag without installing an outer shape change detection sensor on the upstream side.

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

FIG. 1 shows an outline of a configuration of an example of a medical system including a tube pump according to the present invention, and FIG. 2 shows an example of a related art configuration corresponding thereto.

As can be seen by comparing the two figures, the gist of the present invention simplifies the use of the upstream external shape change detection sensor provided in the prior art.

As understood from FIG. 1, if the tube pump continues to operate even after the supply of the liquid in the supply bag is completed, the tube pump roller 7 squeezes the tube and then synchronizes with the timing of separation from the tube. Negative pressure is generated in the downstream tube, and the output signal of the downstream outer shape change detection sensor changes to an arbitrary level of amplitude.

The current waveform of the tube pump drive motor also changes to an amplitude of an arbitrary level in synchronization with the timing when the roller 7 starts squeezing the tube.
From these, the amplitude cycle of the current waveform of the tube pump drive motor and the amplitude cycle of the downstream side external shape change detection sensor output signal coincide (synchronize) as shown in FIG.

FIG. 4 shows the relationship between the current waveform of the tube pump drive motor and the downstream outer shape change detection sensor output signal when the tube pump operating speed is low, and the downstream outer shape change detection synchronized with the current waveform of the drive motor. When the amount of change in the sensor signal and the amount of change in the current waveform of the drive motor exceed a predetermined threshold, the medical device determines that the supply of the liquid in the supply bag has ended and stops the tube pump operation. In addition, the user is notified by an alarm or the like that the supply bag is empty.

Further, although not described in detail, when the tube pump operates at a low speed, the output signal change amount of the downstream outer shape change detection sensor that appears in synchronization with the movement of the roller 7 is as shown in FIG. In addition to the motor current waveform alone, the amount of change is too small, making it difficult to determine the end of liquid supply in the supply bag, and the change in the output signal of the external shape change detection sensor is synchronized with the motor current waveform. If this is not the case, the possibility that the change will be due to disturbance increases, so the threshold for determining that the supply bag is empty is small when the tube pump speed is slow and large when it is fast. It is also effective to be able to cope with a wide speed range of the pump.

The tube pump according to the present invention realizes the supply end detection of the liquid in the supply bag in an artificial dialysis machine or the like with a simple configuration and without impairing the reliability, so that it can be used more frequently.

It is a figure which shows the example of the tube pump apparatus which concerns on this invention. It is a figure which shows the example of the conventional tube pump apparatus. It is a figure which shows the relationship between the electric current waveform of a tube pump drive motor, and a downstream external shape change detection sensor output signal. It is a figure which shows the relationship between the current waveform of a tube pump drive motor in case a tube pump drive speed is low speed, and a downstream external displacement detection sensor output signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Supply bag 2 Human body 3 Elastic tube 4 Upstream external shape change detection sensor 5 Downstream external shape change detection sensor 6 Tube pump drive electric motor 7 Roller 8 Apparatus body 9 Roller moving direction 10 Control panel 11 Electric motor 12 Determination circuit

Claims (1)

A housing having an arcuate inner peripheral surface, a drive motor integrally held in the housing, and a plurality of links that are rotatable about the arcuate inner peripheral surface of the housing, linked to the drive shaft of the drive motor. In the tube pump configured to transfer the liquid in the elastic tube guided and inserted along the arcuate inner peripheral surface of the housing by the rolling pressing of the roller,
A tube outer shape change detection sensor is provided on the downstream side of the roller rolling pressure, and the tube outer shape change detection sensor is configured to be a liquid supply end detection means in the supply bag. The signal and the current waveform of the drive motor are used as liquid supply end detection means in the supply bag, and the synchronized change between the signal of the tube outer shape change detection sensor and the current waveform of the drive motor is the liquid in the supply bag It is comprised so that it may become a supply completion | finish detection means of the tube pump characterized by the above-mentioned.

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