Liquid feed bag and formed displacement liquid preparation system thereof

Abstract

The invention discloses a liquid feed bag which comprises a bag body made of a flexible material, wherein a liquid orifice used for allowing liquid to flow in and out of the bag body and an air orifice used for allowing air to flow in and out of the bag body are formed in the bag body; a liquid tube is inserted into the liquid orifice and connected with the bag body in a sealed manner; the tail end of the liquid tube stretches into the bottom of the interior of the bag body; concentrated liquor or dried powder of a corresponding amount is filled in the bag body according to the volume of the bag body and the concentration of the needed solution; the interior of the bag body is vacuumized, and when the preparation needs to be prepared, reverse osmosis water is injected into the bag body through the liquid tube. The invention further provides a displacement liquid preparation system which comprises the liquid feed bag, and a blood circuit, a blood filter, a displacement liquid circuit, a dialysate supply switch circuit and a waste liquid discharging circuit. The invention has the beneficial effects of being automatic in adjustment, high in control precision, wide in usage range, convenient to use, low in cost, stable and reliable.

Description

technical field [0001] The invention relates to the technical field of blood purification, in particular to a liquid supply bag and a replacement liquid preparation system composed of the same. Background technique [0002] Blood purification equipment is to pass the blood through the central part of a hollow fiber semi-permeable membrane that allows medium and small molecular substances to pass through, so that the prepared isotonic liquid (such as dialysate, replacement fluid, peritoneal dialysis fluid, balance fluid, etc.), Through the outside of the hollow fiber membrane, under the action of osmotic pressure and transmembrane pressure, a large amount of water and medium and small molecule toxins in the patient's body can be removed through the principles of mass, convection and ultrafiltration, and the balance of water, electrolyte and alkali-acid in the body can be maintained to achieve A therapeutic device for blood purification. The current blood purification equipme...

AI Technical Summary

Problems solved by technology

[0003] The isotonic liquid preparation of commonly used blood purification equipment has the following disadvantages: 1) The isotonic liquid needs to control the rotation of the A liquid pump, the B liquid pump and the reverse osmosis water pump through the computer system according to a fixed ratio of rotation speed, so as to achieve accurate dosing

If the rotation speeds of the three liquid pumps are slightly deviated or out of sync, the concentration of the prepared liquid will deviate greatly, which will seriously affect the effect of treatment and even the life safety of patients.

And because this kind of preparation can only adopt a fixed flow rate for proportioning, it is impossible to linearly adjust the speed and flow of the preparation; On one side of the scale, the clean replacement fluid bag is hung on the other side of the scale to balance the amount of fluid in and out. During the hemofiltration process, the machine must be stopped to change the fluid bag, which will affect the treatment time, and this process must be manually operated, which is cumbersome and prone to operational errors; 3) Two electronic scales must be used, one for the weight of the replacement fluid, and the other for the weight of the replaced waste fluid. The computer balances the electronic scale through gravity and pressure sensors, so the two electronic scales must be corrected regularly, otherwise the treatment effect will be affected ; 4) The structure of the equipment is complicated, there are many parts, it is easy to break down, and it is difficult to maintain and detect, and the reliability and stability are poor

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