JPS6015557Y2 - Dialysate deaerator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dialysate degassing device that can efficiently separate and remove air bubbles (mainly air) present in the dialysate supplied to a hemodialyzer.

Generally, the dialysate supplied to a hemodialyzer is prepared by diluting and mixing the dialysate stock solution and water to a certain concentration in a dialysate supply tank, and then heating to separate and remove dissolved air in the dialysate. is being carried out.

However, the bubble separation method using heating has the disadvantage that dissolved air cannot be sufficiently separated during the winter season when the water temperature is low because the solubility of air in water increases.

If dissolved air exists in the dialysate, air bubbles are generated due to the reduced pressure when the dialysate is used under reduced pressure conditions, and these air bubbles adhere to the dialysis membrane.

Air bubbles attached to the dialysis membrane cause a decrease in dialysis performance for the following reasons.

(1) Since the liquid does not flow to the part attached to the membrane, contact between the liquid and the membrane is prevented in that part, and the effective membrane area is reduced.

(2) The flow path resistance increases because the air bubbles block the flow path.

(3) Since the liquid does not flow through the bubbles, the flow becomes uneven.

(4) If air bubbles elute to the blood side through the membrane, blood clots may occur, and if air bubbles enter the vein as they are, air embolism may occur.

Therefore, it is extremely important to separate the air dissolved in the dialysate.

The inventors of the present invention have conducted extensive research in order to provide a deaerator with a simple structure that can be installed as appropriate in the dialysate supply system that connects the existing dialysate supply tank and hemodialyzer, and which has a high degassing effect. This is what led us to the present invention.

That is, in the present invention, in a dialysate supply system connected to a dialysate storage tank, a pressure reduction branch pipe is led out from the supply system on the upstream side of the storage tank, and a pressure reduction adjustment valve and a deaeration check valve are installed in this branch pipe. A transparent short pipe and a circulation pump are sequentially connected to the dialysate reservoir, and the dialysate reservoir, the valve, the transparent short pipe, and the circulation pump are formed as a circulation circuit by the branch pipe. , a liquid level detector is provided to detect the liquid level at the upper and lower parts of the dialysate storage tank, and when the liquid level at the lower part, which is controlled in conjunction with this liquid level detector, is detected, it opens,
This dialysate deaerator is characterized in that a valve that closes when the upper liquid level is detected is attached to an exhaust pipe connected to the top of the dialysate reservoir.

The novel concept of this invention lies in the installation of a pressure reduction adjustment valve and a transparent short pipe for checking degassing on the upstream side of the circulation pump.

Based on this idea, the flow path of the circulation circuit is throttled with a pressure reduction adjustment valve such as a needle valve or a pinch valve, and the air dissolved in the dialysate is foamed under the large negative pressure generated by the nozzle effect. The advantage is that the optimum negative pressure value can be adjusted using the valve while directly viewing the state through the adjacent transparent short tube and observing the bubbling phenomenon of dissolved air.

Another novel idea of the present invention is to provide a liquid level detector that detects the liquid level at the top and bottom of the dialysate reservoir, and to connect this liquid level detector to the exhaust pipe connected to the top of the dialysate reservoir. This is due to the interlocking control of the valves that were installed.

With this idea, a large amount of gas accumulated in the dialysate reservoir can be automatically discharged, and it is possible to completely prevent the gas in the reservoir from entering the dialysate supply system again.

Next, an embodiment of the present invention will be described with reference to the drawings.

The dialysate deaerator of the present invention has a depressurizing branch pipe 2 led out from the upstream side of a dialysate supply system 1 to which a dialysate storage tank 7 is connected.
Valve 3 for pressure reduction adjustment and transparent short tube 4 for degassing check
and a circulation pump 5 are connected in sequence, and this branch pipe 2 is connected to a dialysate storage tank 7 to form a circulation circuit.

By connecting the depressurizing branch pipe 2 to the circulation pump 5 via the valve 3 and the transparent short pipe 4 in this manner, the bubbling phenomenon occurring in the depressurizing branch pipe 2 can be observed through the transparent short pipe 4. , This allows the valve 3 to be adjusted to set optimal pressure reduction conditions.

The transparent short tube 4 is a tube made of transparent glass or plastic, and is preferably provided with appropriate lighting to make it easier to observe the bubbling phenomenon.

In the device of the present invention, a bubbling phenomenon accompanied by a small noise is usually observed at 650 to 700 mmHg.

The flow rate of this foaming decreases when the negative pressure exceeds this level, and no foaming is observed below that level.

Therefore, the point with small noise, i.e. 650-700m
It is estimated that a reduced pressure condition of mHg is optimal.

As the pressure reducing branch pipe 2, a thick silicone tube or a PVC tube can be used.

Further, as the pressure reduction adjustment valve 3, a pinch valve, which has no risk of air intrusion, is preferable to a needle-shaped valve, which has a risk of air intrusion from the ground portion.

When using a pinch valve, it is preferable to use a thick-walled silicone tube that has elasticity and does not close due to negative pressure.

As the transparent short tube 4, the thick transparent silicone tube described above is used, but it may also be a transparent glass tube or a resin tube such as polypropylene.

The air bubbles that flow into the dialysate storage tank 7 used in the present invention accumulate in the upper part of the tank, so the liquid level in the tank gradually falls, and if this liquid level falls, there is a risk that gas will get mixed into the dialysate supply system. .

Therefore, the liquid level detector 8 (in the figure, it is a float type liquid level detector, which detects the liquid level at the upper and lower parts of the storage tank, and upper and lower liquid level detection switches are installed at both ends of the shaft that supports this float. The upper liquid level detection switch 8 of this liquid level detector is activated when the liquid level continues to fall to a predetermined level. Open the valve 9 to exhaust the gas in the tank.

When the gas is discharged from the exhaust pipe 10, the liquid level in the storage tank rises, and when the liquid level rises to a predetermined level, the lower switch of the liquid level detector is activated to close the valve and lower the liquid level in the storage tank. is under control.

Furthermore, it is preferable to install a flow path resistor such as a mesh 12 at the bottom of the dialysate reservoir to prevent air bubbles from flowing out.

Further, as the circulation pump, a known vacuum pump can be used, but it is preferable to use a pump with less liquid leakage, such as a monoscrew pump.

As mentioned above, the dialysate deaerator of the present invention has a simple structure.
In addition, the deaeration effect can be visually observed, and the gas that has accumulated in the dialysate reservoir is automatically discharged to prevent a large amount of gas from accumulating in the reservoir, making it an extremely safe and practical device. be.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a system diagram showing an embodiment of the dialysate degassing device of the present invention. 1... Dialysate supply system, 2... Branch pipe for pressure reduction, 3... Valve for pressure reduction adjustment, 4...
・Transparent short tube, 5... Vacuum pump, 7...
・Dylysate storage tank, liquid level detector, 9...
...Valve, 10...Exhaust pipe.

Claims (1)

[Scope of utility model registration request] In a dialysate supply system connected to a dialysate storage tank, a branch pipe for pressure reduction is led out from the supply system on the upstream side of the storage tank, and a valve for pressure reduction adjustment, a transparent pipe for checking deaeration, and a pressure reduction branch pipe are led out from the supply system on the upstream side of the storage tank. A circulation pump is sequentially connected to the dialysate storage tank, and the dialysate storage tank, the valve, the transparent short pipe, and the circulation pump are formed as a circulation circuit by the branch pipe, and the dialysate storage tank is connected to the dialysate storage tank. is equipped with a liquid level detector that detects the liquid level at the top and bottom, and is controlled in conjunction with this liquid level detector.
A dialysate removal device characterized in that a valve that opens when a lower liquid level is detected and closes when an upper liquid level is detected is attached to an exhaust pipe connected to the top of the dialysate storage tank. Air device.