JP2831720B2 - Dialysate preparation device - Google Patents

Description

The present invention relates to an apparatus for preparing dialysate used in artificial kidneys known as hemodialysis machines.

"Conventional technology" Since the volume of dialysate required for dialysis treatment is extremely large,
Usually, a high concentration stock solution for dialysis is diluted prior to use.

As a dialysis solution preparation device for diluting such a dialysis stock solution, an apparatus of a type in which a stock solution and a dilution water are fed at a predetermined flow rate using a metering pump and continuously mixed, and a method of measuring the stock solution, There is an apparatus of a type for diluting the mixture to a predetermined concentration in a mixing tank.

The former device using a metering pump has a built-in danger that a failure in the pump system causes an error in dilution.
On the other hand, the latter type of device which performs pre-weighing has the advantage that there is no such danger.

FIG. 5 shows a conventional example of the latter type of dialysate preparation device using a measuring tank. The apparatus includes a mixing tank 2 to which a dilution water supply path 1 is connected, an A stock solution measuring tank 4 to which an A stock solution supply path 3 is connected, and a B stock solution supply path 5.
Is connected to the B stock solution measuring tank 6 to which the. The undiluted solution measured in the measuring tanks 4, 6 is supplied to the solenoid valves 4b,
The mixture is sent to the mixing tank 2 through outflow pipes 4a and 6a provided with 6b.

To prepare a dialysate with this dialysate preparation device,
First, A and B are supplied from A and B stock solution supply channels 3 and 5 to measuring tanks 4 and 6, respectively.
Inject the stock solution. When the liquid level of the injected stock solution rises and the level switches 4c and 6c are turned on, the stock solution supply paths 3 and 5
The solenoid valves 3a and 5a are closed and the supply of the undiluted solution is stopped.
The measurement of the stock solution and the stock solution B is completed. In this way, a small amount of dilution water is poured into the mixing tank 2 from the dilution water supply path 1 while measuring the stock solution. After preparation is completed like this,
The electromagnetic valves 4b and 6b of the measuring tanks 4 and 6 are opened to inject the measured undiluted solution into the mixing tank 2. The reason why the dilution water is previously injected into the mixing tank 2 is to avoid the direct mixing of the A and B stock solutions.

After the dilution water and the undiluted solutions A and B have been injected into the mixing tank 2 as described above, additional dilution water is further injected until the liquid level of the mixing tank 2 reaches the level switch 2a. The pump 7a of the stirring pipe 7 connected to the side is operated to make the liquid in the mixing tank 2 flow, thereby promoting the mixing.

The dialysate obtained by thus uniformly mixing the dilution water and the A and B stock solutions is sent to the dialyzer by opening the solenoid valve 2c of the dialysate supply pipe 2b.

"Problem to be Solved by the Invention" In such a conventional dialysate preparation device, an outflow pipe
There is a concern that the solenoid valves 4b and 6b provided in 4a and 6a are likely to be clogged with components precipitated from the concentrated stock solution, and the measured stock solution is not completely sent to the mixing tank 2. For this reason, in the conventional dialysate preparation apparatus, it is necessary to pay attention to the maintenance between the stock solution measuring tanks 4 and 5 and the mixing tank 2 in order to keep the concentration of the dialysate stable.

In addition, the conventional dialysate preparation apparatus has been unsatisfactory because of the large number of components.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dialysate preparation device having a simple structure and higher safety.

[Means for Solving the Problems] In the dialysate preparation apparatus of the present invention, a stock solution measuring tank having an overflow section and connected to a stock solution supply line for dialysis solution is provided in a mixing tank to which a dilution water supply line is connected. The above-mentioned object is achieved by accommodating and disposing a communication pipe provided with a mixing pump between the inside of the stock solution measuring tank and the inside of the mixing tank.

[Operation] When adjusting the dialysate with the dialysate adjusting device, first, the undiluted solution is sent from the undiluted dialysis supply line to the undiluted solution measuring tank. On the other hand, dilution water is also injected into the mixing tank from the dilution water supply line. When the mixing pump in the communication pipe is operated in this state, the dilution water in the mixing tank flows into the stock solution measuring tank. Then, the stock solution stored in the stock solution measuring tank flows out of the overflow portion of the tank and flows down into the mixing tank. The undiluted solution flowing down is mixed with the dilution water in the mixing tank. When the operation of the mixing pump is continued and the circulation of the solution through the communication pipe is continued, the mixing of the dilution water and the stock solution is promoted.

Then, when the dialysate adjusted as described above is discharged from the mixing tank, if the liquid level in the mixing tank is lower than the liquid level of the solution remaining in the raw liquid measuring tank, the raw liquid is measured by a siphon phenomenon. Since the solution in the tank flows backward through the communication pipe line and moves toward the mixing tank, the dialysate in the stock solution measuring tank is also discharged at the time when the discharging of the dialysate from the mixing tank is completed.

"Example" Hereinafter, the dialysate preparation device of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a dialysate preparation apparatus according to the present invention, which is schematically constituted by a mixing section 10, a dilution water supply section 11, and a dialysate storage section 12.

The mixing unit 10 includes a mixing tank 13, an A stock solution measuring tank 14,
It is schematically constituted by a stock solution measuring tank 15 and a communication pipeline 16. The mixing tank 13 has a dilution water supply pipe 17 for supplying dilution water from the dilution water supply section 11, a liquid supply pipe 18 for sending the prepared dialysate to the dialysate storage section 12, and a liquid having a poor concentration. A drain pipe 19 for discarding the like, an overflow pipe 20 for discarding the overflowed liquid, a cleaning liquid supply pipe 21 for supplying acetic acid for removing dirt in the mixing tank 13, and a A disinfectant supply pipe 22 for supplying a chemical for disinfection is connected. Further, inside the mixing tank 13, a mixing start level switch 13a for detecting a liquid level for starting the driving of the mixing pump 16a of the communication pipe 16 described later, and a water storage tank 31 described later
And a diluting water metering level switch 13b for detecting the liquid level at which the supply of diluting water from the liquid is stopped.

In the mixing tank 13, the undiluted solution measuring tank 1 is provided.
4,15 are housed. These undiluted solution measuring tanks 14 and 15 are box-shaped with an open top, and the upper openings are overflow portions 14a and 15a. In addition, these stock solution measuring tanks 1
4 and 15 are provided back to back, and a partition wall 23 extending upward from the overflow portions 14a and 15a is provided therebetween. These stock solution measuring tanks 14 and 15 are
It is located almost in the center of the. A stock solution measuring tank 14
The A stock solution supply line 25 is inserted into the tank, and the B stock solution supply line 26 is inserted into the B stock solution measuring tank 15. The stock solution measuring tanks 14 and 15 are provided with stock solution level switches 14b and 15b for detecting that a predetermined amount of stock solution has been injected.

These stock solution measuring tanks 14 and 15 and the mixing tank 13
A communication conduit 16 is provided between the two. Communication line 16
Is divided into two branches, and each stock solution measuring tank 1
Inserted at 4,15. And their tips reach the vicinity of the bottom of the stock solution measuring tanks 14,15. On the other hand, the other end of the communication pipe 16 is connected to the bottom plate side of the mixing tank 13. The communication pipe 16 is provided with a mixing pump 16a, and the liquid at the bottom of the mixing tank 13 is supplied to a stock solution measuring tank.
The liquid can be sent within 14,15. A magnet drive pump is used as the mixing pump 16a. The communication line 16 is provided with a concentration meter 27 for measuring the concentration of the liquid flowing through the communication line 16.

The liquid sending pipe 18 connected to the mixing tank 13 is for sending the dialysate prepared in the mixing tank 13 to a supply tank 37 of the dialysate storage unit 12 described later using a siphon phenomenon. The liquid supply pipe 18 once rises from the bottom of the mixing tank 13 to the upper part of the mixing tank 13, is drawn out of the mixing tank 13 and descends, and is supplied to the supply tank of the dialysate reservoir 12.
Guided to 37. The end of the liquid feed pipe 18 on the side of the mixing tank 13 is located below the bottom surfaces of the raw liquid measuring tanks 14 and 15. A trigger pipe 29 having an electromagnetic valve 29a can be provided between the middle part of the liquid sending pipe 18 and the bottom of the mixing tank 13. The trigger pipe 29 is obliquely connected to the liquid feed pipe 18 from above, as shown in FIG. This connection angle is set to about 60 degrees.

The dilution water supply unit 11 includes a heating tank 30 and a water storage tank 31.
This is schematically configured. The heating tank 30 is a tank provided with a heater 32. The dilution water heated to a predetermined temperature in the heating tank 30 is sent to a water storage tank 31 by a pump 33. Water storage tank
31 is arranged above the mixing tank 13. The water storage tank 31 is provided with a level sensor 31a for detecting the lower limit position of the level of the stored dilution water and a level sensor 31b for detecting the upper limit position. The water storage tank 31 and the mixing tank 13 are connected by the dilution water supply pipe 17. The diluting water supply pipe 17 performs liquid transmission using a siphon phenomenon, similarly to the liquid transmission pipe 18. The dilution water supply pipe 17 once rises from the bottom to the top of the water storage tank 31, is drawn out of the water storage tank 31, descends, and is drawn into the mixing tank 13.
A trigger pipe 35 having an electromagnetic valve 35a is provided between the intermediate portion of the dilution water supply pipe 17 and the bottom of the water storage tank 31. The trigger pipe 35 and the dilution water supply pipe 17 are also provided with the liquid sending pipe.
Similarly to 18, as shown in FIG. 2, it is connected to the dilution water supply pipe 17 at an angle of about 60 degrees from obliquely above.

The dialysate storage section 12 is a section for temporarily storing the dialysate adjusted to a predetermined concentration in the mixing section 10 before sending the dialysate to the dialyzer. The dialysate storage unit 12 is schematically constituted by a supply tank 37 and a liquid sending line 39. Supply tank
37 is arranged below the mixing tank 13. In the supply tank 37, a warning level switch 37a that issues a warning signal when the stored amount of dialysate decreases unnecessarily, a preparation start level switch 37b that issues a signal for starting preparation of the dialysate, and a dialysate And a preparation stop level switch 37c that emits a signal for stopping the preparation. The liquid feed line 39 is connected to the bottom of the supply tank 37. The liquid sending line 39 has a concentration meter 39a for checking the concentration of the dialysate to be supplied, and a supply pump 3
9b and a valve 39c are provided. On the upstream side of the supply pump 39b of the liquid sending line 39, a drain 4 having a valve 40 is provided.
1 is connected. Further, a supply pressure adjusting line 43 is provided between the downstream side of the supply pump 39b and the supply tank 37. The supply pressure adjustment line 43 is provided with a supply pressure gauge 43a and a supply pressure adjustment valve 43b.

 Next, the operation of the dialysate preparation device will be described.

When adjusting the dialysate with this dialysate adjusting device, first, the A stock solution stored in the A stock solution storage tank 45 is supplied to the A stock solution measuring tank 14 via the A stock solution supply line 25. At the same time, the B stock solution stored in the B stock solution storage tank 46 is supplied via the B stock supply line 26 to the B stock solution measuring tank 15.
To supply. When these liquid sending amounts reach a predetermined amount, the stock solution measuring level switches 14b and 15b detect this. Then, the valves 25a and 26a of the supply lines 25 and 26 are closed.

Next, the dilution water in the water storage tank 31 is supplied to the mixing tank 13. In this case, the trigger pipe connected to the dilution water supply pipe 17
The 35 solenoid valve 35a is opened and the dilution water is inserted into the downstream portion of the pipe 17. This triggers the siphon phenomenon, whereby the dilution water in the water storage tank 31 is sucked from the supply pipe 17 and flows into the mixing tank 13. The level of the dilution water injected into the mixing tank 13 rises and the mixing start level switch 13a is turned on.
Then, the mixing pump 16a of the communication pipe 16 is operated, and the solution mixing step is started. In this step, the dilution water in the mixing tank 13 is transferred to the undiluted solution measuring tank via the communication line 16.
Sent to 14,15. Then, the stock solution A and the stock solution B measured in the stock solution measuring tanks 14 and 15 flow out of the overflow portions 14a and 15a of the tanks 14 and 15 and flow down into the mixing tank 13. At this time, since the undiluted solution measuring tanks 14 and 15 are partitioned by the partition wall 23, the undiluted solution A and the undiluted solution B are mixed before being mixed with the dilution water.
The stock solutions do not mix directly. The undiluted solutions A and B thus mixed with the dilution water in the mixing tank 13 respectively. If the operation of the mixing pump 16a is continued and the circulation of the solution through the communication pipe 16 is continued, the mixing of the dilution water and the A and B stock solutions is promoted. The injection of dilution water is continued during this time. Then, when the liquid level in the mixing tank 13 rises and the dilution water measurement level switch 13b is turned on, the solenoid valve 35a of the trigger pipe 35 connected to the dilution water supply pipe 17 is closed, and the water from the water storage tank 31 is closed. The supply of dilution water is stopped. Then, when it is confirmed that the conductivity measured by the densitometer 27 provided in the communication line 16 is stabilized at a predetermined value and that the dialysate having the target concentration can be adjusted, the mixing pump 16a is stopped. Thus, the solution mixing step is completed.

Next, the dialysate discharging step is started. In this discharge step, first, the solenoid valve 29a of the trigger pipe 29 connected to the liquid feed pipe 18
Is opened, and the dialysate is inserted into the downstream portion of the liquid supply pipe 18. Then, this becomes priming, and a siphon phenomenon occurs, and the dialysate in the mixing tank 13 is rapidly sent to the supply tank 37 of the dialysate storage unit 12 through the liquid sending pipe 18. During this time, the liquid level in the mixing tank 13 drops and the stock solution measuring tank 1
When the solution level becomes lower than the liquid level of the solution remaining in the liquid tanks 4 and 15, the solution in the stock solution measuring tanks 14 and 15 flows backward through the communication pipe 16 and moves toward the mixing tank 13 due to a siphon phenomenon. As a result, when the dialysate in the mixing tank 13 is completely discharged, the dialysate in the stock solution measuring tanks 14 and 15 is also discharged. When the liquid level in the mixing tank 13 is discharged through the liquid feed pipe 18 and the trigger pipe 29 as described above, the discharge step is completed.

The dialysate sent to the supply tank 37 of the dialysate storage unit 12 as described above is temporarily stored here. Then, if necessary, it is sent to a dialysis device (not shown) at a predetermined pressure via a liquid sending line 39.

When the solution mixed in the mixing tank 13 is not at a predetermined concentration or when the solution used for cleaning and disinfecting in the mixing tank 13 is discharged from the mixing tank 13, it is connected to the drain pipe 19 of the mixing tank 13. Open the solenoid valve 47 of the trigger tube 46 and insert those solutions into the downstream part of the drain tube 19. Then, this becomes priming water, and those solutions are discharged from the drain pipe 19 in a short time by a siphon phenomenon.

As described above, in the dialysis fluid adjusting device, the undiluted solution measuring tanks 14 and 15 having the overflow sections 14a and 15a are accommodated in the mixing tank 13, and the undiluted solution measuring tanks 14 and 15 and the inside of the mixing tank 13 are mixed. In the solution mixing step, the mixing pump 16a of the communication pipe 16 is operated, and the mixing tank 1 is provided.
By sending the dilution water in 3 to the stock solution measuring tanks 14 and 15, the stock solution in the stock solution measuring tanks 14 and 15 is overflowed by the overflow sections 14a and 15a.
To the mixing tank 13 to mix the stock solution and the dilution water.

On the other hand, in the dialysate discharging step of sending the prepared dialysate to the dialysate reservoir 12, the undiluted solution measuring tank is used due to a siphon phenomenon.
The residual solution in 14 and 15 moves to the mixing tank 13 via the communication pipe 16.

Therefore, in this dialysate preparation device, the undiluted solution measuring tanks 14 and 1
There is no need for a conduit for sending the high-concentration stock solution measured in 5 to the mixing tank 13, and the problem of clogging of the solenoid valve due to deposition of stock solution components, which has conventionally been a problem, can be completely avoided. Therefore, in this dialysate preparation apparatus, the maintenance burden for keeping the dialysate concentration stable is greatly reduced.

Further, since the dialysis fluid preparation device has a simple structure, the number of components can be reduced, and the production cost can be reduced.

In addition, in this dialysate preparation device, the dilution water supply pipe 17 provided with the trigger pipes 35 and 29 and the liquid feed pipe 18 provide a water storage tank 31.
The liquid is sent from the mixing tank 13 to the mixing tank 13 and from the mixing tank 13 to the supply tank 37 using the siphon phenomenon, so that a small amount of priming water is sent to the dilution water supply pipe 17 through the trigger pipes 35 and 29. Simply insert into the downstream part of tube 18, each tube 17,1
8 can generate a large amount of flow.

Therefore, in this dialysate preparation device, small-diameter solenoid valves 35a, 29a of the trigger tubes 35, 29 can be used, and the structure of the device can be simplified and the manufacturing cost can be reduced.

(Other Embodiments) FIGS. 3 and 4 show a trigger tube 35 of a dialysate preparation device.
This shows another example of the structure of the connecting portion between the feed pipe 17 and the dilution water supply pipe 17, or the trigger pipe 29 and the liquid feed pipe 18. (In the following description, the connection structure between the liquid feed pipe 18 and the trigger pipe 29 will be described.) In the connection structure shown in FIG. 3, the distal end portion of the trigger pipe 29 connected to the liquid feed pipe 18 at a right angle. Are bent in an L-shape.

In the connection structure shown in FIG. 4, a T-shaped side pipe 49 is continuously provided on the side surface of the liquid sending pipe 18, and a trigger 29 whose tip is bent in an L shape is inserted into the side pipe 49. Have been. A ring 50 is fitted to the tip of the trigger pipe 29, and the opening area of the liquid feed pipe 18 is formed to be small at this portion.

Even when these connection structures are adopted, the first embodiment
The same operation and effect as those of the dialysis solution preparation device can be obtained.

[Effect of the Invention] As described above, the dialysate preparation device of the present invention has a stock solution measuring tank having an overflow section and connected to a stock dialysate supply line in a mixing tank to which a dilution water supply line is connected. And a communication pipe provided with a mixing pump between the stock solution measuring tank and the mixing tank. In the solution mixing step, the mixing pump is operated by operating the communication pipe in the communication pipe. By sending the dilution water in the tank to the stock solution measuring tank, the stock solution in the stock solution tank flows down from the overflow section into the mixing tank, so that the stock solution and the dilution water can be mixed.

On the other hand, in the dialysate discharge step of sending the prepared dialysate to the dialysate reservoir, the residual solution in the undiluted solution measuring tank moves to the mixing tank via the communication pipe by a siphon phenomenon.

Therefore, in the dialysate preparation apparatus of the present invention, a pipe line for feeding the measured stock solution to the mixing tank is not required at all, and it is possible to completely avoid the trouble that the space between the measuring tank and the mixing tank is clogged by precipitation of the stock solution component. Therefore, in the dialysate preparation device of the present invention, the maintenance burden for maintaining the dialysate concentration stable is greatly reduced.

Also, the dialysis fluid preparation device of the present invention has a simple structure, so that the number of components can be reduced, and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the dialysate preparation apparatus of the present invention, FIGS. 2 to 4 are cross-sectional views showing a connection structure of a trigger pipe to a dilution water supply pipe or a liquid feed pipe, and FIG. FIG. 2 is a configuration diagram showing a main part of a conventional dialysate preparation device. 13 ... mixing tank, 14 ... A stock solution measuring tank, 14a ...
Overflow section, 15 …… B stock solution measuring tank, 15a ……
Overflow section, 16: communication conduit, 16a: mixing pump, 17: dilution water supply pipe, 25: A stock solution supply line, 26 ... B stock solution supply line.

Claims (1)

(57) [Claims] 1. A stock solution measuring tank having an overflow section and connected to a stock dialysis solution supply line is accommodated in a mixing tank to which a dilution water supply line is connected. A dialysis fluid preparation device, characterized in that a communication pipe provided with a mixing pump is disposed between the dialysis fluid preparation device and the dialysis fluid preparation device.