JPS5912905Y2 - Artificial kidney dialysate deaerator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a degassing device for separating and removing air and gas dissolved in dialysate or dilution water in an artificial kidney.

In a typical keel type artificial kidney dialysis machine, dialysate heated to a predetermined temperature is generally heated to a positive pressure of -100 to 400.
Air bubbles are generated because suction is performed at about mmHg.

Since these air bubbles intermittently flow into the pressure relief pump, the air bubbles have been recognized to cause problems such as making the pressure relief produced by the pump unstable and making the dialysis action uneven.

On the other hand, in general, few artificial kidney dialysis machines are equipped with a mechanism that actively separates and removes air bubbles and the like.

In response to this, the inventors devised a deaerator (Utility Application No. 52-32037) having a mechanism for migratively separating and removing air bubbles and the like.

This system has a discharge port at the top, an on-off valve, a passage narrowing limiter, and a deaeration pump are installed in this order in the dialysate inflow passage, and a dialysate outflow passage. This mechanism has a circulation passageway that connects the on-off valve to the inflow passageway from an outlet separate from the passageway, so that properly degassed dialysate is less affected by fluctuations in the usage amount and can be degassed in a controlled manner. This method allows the supply of air at the same temperature.

On the other hand, in this method, the dialysate inflow path is directly connected to the degassing tank via the throttle valve and degassing pump, so it is not easily affected by fluctuations in the pressure or flow rate of the dialysate being supplied. ,
Processing conditions and processing volume are unstable, making it difficult to supply properly degassed dialysate.

Furthermore, depending on the situation, the specifications of the degassing device tend to vary depending on the capacity of the installed supply device, etc.

Therefore, the present inventors have come up with the present invention, which is not affected by the inflow side, in order to take advantage of the already devised deaerator.

The present invention provides a mechanism that is not affected by the inflow side by providing an adjustment tank in the degassing device described above.

That is, it is a separated tank with an air/gas outlet at the top, one of which is a regulating tank and the other a deaeration tank, and the regulating tank has an inflow passage for dialysate or diluted water with an on-off valve. It has a conveyance passage for the dialysate to the degassing tank, in which a passage narrowing limiter and a degassing pump are installed in this order, and the passage narrowing restrictor and the degassing pump are connected to the conveying passage through a switching valve. This is an artificial kidney dialysate degassing device characterized by having a circulation path communicating between the

Therefore, in the present invention, the supplied dialysate heated to a predetermined temperature is temporarily stored in a regulating tank, and when the liquid level in the tank is adjusted, the on-off valve of the inflow passage is opened and closed to control the inflow amount.

Once the dialysate has flowed into the adjustment tank, it is sent to the deaeration tank via the passageway through the passage narrowing restrictor and the deaeration pump.
Air and gas dissolved in the dialysate are effectively separated under the high negative pressure generated between the passage narrowing restrictor and the degassing pump without being affected by the inflow side, and the generated air bubbles are removed from the outlet. At the same time as removal, the switching valve in the conveyance passage is activated when switching to the circulation passage, and when adjusting the liquid level in the deaeration tank, the deaeration pump is activated by shutting off the conveyance passage and opening the circulation passage. The degassed dialysate stored in the tank continues to circulate.

Therefore, by properly deaerating the dialysate and using the circulation passage when adjusting the liquid level, the deaeration pump can remain in operation, and since the circulation passage does not pass through the passage narrowing restrictor, it is faster than when it passes through it. The purpose of the present invention is to provide a degassing device that prevents further degassing of dialysate that has already been properly degassed since it is not maintained under a high negative pressure, and that provides stable processing conditions and processing flow rates.

Next, embodiments of the deaerator of the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 1, the tank is divided into an adjustment tank 1 and a deaeration tank 8 so that the calibration tank is in contact with each other. It flows in through the installed inflow passage 3.

The on-off valve 2 is a level meter 4 installed in the tank 1 for adjusting the liquid level.
The dialysate is maintained at a predetermined volume in the tank 1.

Once the dialysate has flowed into the adjustment tank 1, it passes through the transport passage 7 via the passage narrowing restrictor 5 and the deaeration pump 6, and is sent to the deaeration tank 8. Therefore, the effect on the side flowing into the transport passage 7 is The passage narrowing restrictor 5 is controlled only by the water head (hydrostatic pressure) in the adjustment tank 1, and is not affected by the original pressure or flow rate on the inflow side.
The deaeration conditions and processing amount of the dialysate are determined by the degree of restriction and the capacity of the deaeration pump 6.

At this time, the already heated dialysate is partially squeezed by the passage narrowing restrictor 5 and sucked by the degassing pump 6.
A stronger pressure reduction is generated between the passage narrowing restrictor 5 and the deaeration pump 6 than simply suction by the deaeration pump 6.

This does not change the fact that air and gas dissolved in the dialysate become bubbles and are effectively separated from both the temperature and pressure aspects.

The adjustment tank 1 is a tank that has a liquid level adjustment mechanism to eliminate the effects of fluctuations in pressure and flow rate on the original inflow side and to ensure stable deaeration processing and flow rate in the conveyance path 7. .

The passage narrowing restrictor 5 is a device that generates strong pressure relief, and may be any device that narrows the passage.For example, it may be a device that simply narrows the cross-sectional area of a part of the passage, but it can also be used to adjust the pressure relief. For this purpose, a throttle valve such as a needle valve is preferable.

The degassing pump 6 is a pump that performs vacuum suction, and includes, for example, a magnet I drive type gear pump, a monoscrew type pump for high viscosity suction, and the like.

The dialysate thus degassed is led into the deaeration tank 8, and the separated air bubbles are removed from the outlet 9.

In this case, the inlet to the tank 8 is connected to a pipe or cylinder 10 to prevent the separated air bubbles from being mixed into the degassed dialysate and sent to the dialyzer. It is further preferred if the aerated dialysate is directed upwards.

The dialysate thus degassed is stored in the deaeration tank 8 and sent to the dialyzer through the outflow passage 12 by the transfer pump 11.

On the other hand, liquid level adjustment is controlled by a level meter 13 and a switching valve 14.

That is, when the liquid level rises and the level meter 13 senses it at the set upper limit, the switching valve 14 closes the conveyance passage 7 side, opens the circulation passage 15 side, and stops the flow of dialysate from the adjustment tank 1.
The degassed dialysate stored in the deaeration tank 8 is circulated, and when the liquid level falls again and the level meter 13 senses it at the set lower limit, the switching valve 14 is activated to close the circulation passage 15 side. ,
The transport passage 7 side is opened, and the dialysate in the adjustment tank 1 is sent to the deaeration tank 8 through the transport passage 7 again.

With this mechanism, there is no need to repeatedly drive and stop the deaeration pump 6 in order to adjust the liquid level in the deaeration tank 8, so there is no negative effect on the deaeration pump 6, and in addition, the switching valve 14 Since the confluence position of the circulation passage 15 that flows into the conveyance passage 7 via the passage is between the passage narrowing restrictor 5 and the degassing pump 6, the circulation passage 15 does not pass through the passage narrowing restrictor 5. Since the dialysate is circulated, the degree of depressurization is not higher than when it is passed through, so the properly degassed dialysate is circulated without further unnecessary degassing.

In addition to further degassing if necessary or degassing through the conveyance passage 7, it is also effective to place the merging position in front of the passage narrowing restrictor 5 in order to increase the degree of degassing.

When operating this device, it is desirable that the degree of pressure relief to degas the dialysate heated to a predetermined temperature during dialysis is stronger than the pressure relief exerted during dialysis. 5 is preferably adjusted to -400 mmHg or less, and more preferably -600 mmHg or less.

To give an example of how to use this device, in a multi-person dialysate supply device, there are two ways: to degas the diluted water before mixing with the dialysate stock solution, and to degas the dialysate after mixed dilution. Yes, it can be applied in either case by changing the installation location of the deaerator.

There is nothing wrong with incorporating the mechanism of this device into each bedside monitor or connecting it as an individual device, but it is economically better to process a large capacity at the supply source as described above. There may be cases where

By using this device, which has an effective and appropriate deaeration function, it is possible to reduce the amount of oxygen, for example, from 8 to 9 pp.
By degassing the undegassed dialysate dissolved in the dialysate to reduce the amount of dissolved oxygen, preferably to 6 ppm or less, bubbles can be removed even if the dialyzer and the path leading thereto are kept under depressurized conditions. There is no generation, therefore, no air bubbles adhere to or remain in the dialysis membrane, which does not impair the dialysis performance, stabilizes the performance, and does not cause an increase in pressure loss.

Furthermore, this device has an adjustment tank in front of the deaeration tank to avoid direct fluctuations in the pressure and flow rate on the inlet side, thereby stabilizing the conditions and flow rate for proper deaeration. A circulation passage is used to ensure stable deaeration function, and to avoid repeatedly driving and stopping the deaeration pump when adjusting the liquid level in the deaeration tank, but it does not repeat deaeration unnecessarily. It is structured like this.

As described above, by exerting these effects, it is possible to make many contributions to improving the performance of artificial kidneys.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention. In the figure, 1 is a regulating tank, 2 is an inflow passage opening/closing valve, 3 is an inflow passage, 4 is a level meter, 5 is a passage narrowing limiter, 6 is a deaeration pump, 7 is a conveyance passage, 8 is a deaeration tank, 9 10 is a cylinder, 11 is a transfer pump, 12 is an outflow passage, 13 is a level meter, 14 is a switching valve, and 15 is a circulation passage.

Claims (4)

[Scope of utility model registration request] (1) It is a divided tank with an air/gas outlet 9 at the top, one side is the adjustment tank 1 and the other is the deaeration tank 8, and the adjustment tank has an inflow passage for dialysate or diluted water. It has a conveyance passage 7 to a deaeration tank in which a passage narrowing restrictor 5 and a deaeration pump 6 are installed in this order, and the deaeration tank is connected to the conveyance passage and an outflow passage of the degassed liquid to the dialyzer. 12, and further includes a switching valve 1
A degassing device for an artificial kidney dialysate, characterized in that it has a circulation passage 15 communicating between a passage narrowing limiter of the conveyance passage and a degassing pump via a passageway 4. (2) The artificial kidney dialysate degassing device according to claim 1, wherein the passageway narrowing restrictor is a device in which a portion of the cross-sectional area of the passageway is narrowed. (3) The passage narrowing restrictor is one in which a throttle valve such as a needle valve is provided in a part of the passage.
The degassing device for artificial kidney dialysate according to item 1) or item (2). (4) The divided tanks are the artificial kidney dialysate according to any one of claims (1), (2), and (3) in which the calibration volumes are in contact with each other. Deaerator.