Double-cavity balance fluid supply system with fluid preparation functions for purifying blood

Abstract

The invention discloses a double-cavity balance fluid supply system with fluid preparation functions for purifying blood. The double-cavity balance fluid supply system comprises a blood circuit, a blood filter, a substitution fluid circuit, a dialysis fluid supply switching circuit and a waste fluid drain circuit. A first inlet of the blood filter is communicated with an outlet of the dialysis fluid supply switching circuit and the arteries of a human body via the blood circuit, and a first outlet of the blood filter is communicated with the veins of the human body via the blood circuit; a second inlet of the blood filter is communicated with an outlet of the substitution fluid circuit via the dialysis fluid supply switching circuit, and fluid can be outwardly drained from a second outlet of the blood filter via the dialysis fluid supply switching circuit and the waste fluid drain circuit; the dialysis fluid supply switching circuit comprises at least two supply circuits, and the various supply circuits are alternately communicated with the second inlet of the blood filter or closed to the second inlet of the blood filter and can be alternately communicated with the second outlet of the blood filter or closed to the second outlet of the blood filter, so that continuous supply structures can be switched over. The double-cavity balance fluid supply system has the advantages of automatic adjustment, high control precision, convenience in use, stability and reliability.

Description

technical field [0001] The invention relates to the technical field of blood purification, in particular to a dual-chamber liquid distribution and balanced liquid supply system for blood purification. 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 ...

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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