Method and apparatus for dialysate preparation and supply

Abstract

A liquid dispensing and feeding method is disclosed. It mainly makes use of a chamber to conduct liquor dispensing and balanced liquor feeding. The liquor dispensing and feeding device comprises a isolated chamber and assembly for dispensing. Inside the chamber, a membrane is provided to separate it at least into two spaces, with one of the space communicated with the liquor dispensing assembly to form a liquor dispensing loop. The invention can regulate the dialysate flow as needed without closing down the machine during dialysis treatment. In addition, it has simple structure, lower production cost, favorable stability.

Description

technical field [0001] The invention relates to hemodialysis medical technology, in particular to a method and device for dosing and balancing liquid supply in a dialysate circuit in hemodialysis equipment. Background technique [0002] Hemodialysis treatment is a dialyzer made by passing blood through a semipermeable membrane that can only pass through small molecule substances (such as electrolytes, small molecule nephrotoxins), so that the blood is on one side of the membrane, and the dialysate is on the other side of the membrane. The solutions on one side and both sides pass through diffusion and osmosis, that is, the solute flows from the side with high concentration to the side with low concentration, so that the medium and small molecular toxins in the blood can penetrate into the dialysate, and the electrolyte can also pass through the osmosis. It is a therapeutic device that achieves the purpose of blood purification by achieving a balance of functions. Existing h...

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Problems solved by technology

Among the above two patents, the German patent solves the problem of liquid supply balance in the dialysate circuit, but the liquid dosing needs to be realized by setting up another liquid dosing device, and it is necessary to adopt the method of synchronous liquid dosing during the liquid supply, which is based on the flow rate and flow rate. The method of dosing liquid often appears in the dialysate circuit (balance chamber), and the attenuation of any electronically controlled valve body will cause the change of flow rate and the instability of conductivity, which directly affects the treatment effect; the Japanese patent solves the problem of dosing liquid problem, and the balance of the dialysate supply can only be achieved by using another balance device. The conductivity of this liquid distribution device is relatively stable, but due to space constraints, not only increases the hardware equipment, but also needs to be synchronized with the balance device Therefore, the flow rate (flow per unit time) of the dialysate flowing through the dialyzer on the dialysate circuit is difficult to be adjusted at will

The principles of the aforementioned two patents are realized on the basis that the liquid dosing and balanced liquid supply of the dialysate circuit are completed by two devices, which leads to the mixing of reverse osmosis water and concentrated A and B dialysates during the dialysate dosing process The ratio, reverse osmosis water flow rate (dialysate flow rate), and conductivity concentration must be set in advance, and cannot be changed arbitrarily during treatment. To adjust these parameters, you must stop the machine before resetting it. It will take a long time to achieve the desired value after restarting the machine. conductivity concentration, and the shutdown operation during the dialysis process is very complicated, which may cause major medical accidents. Therefore, all existing hemodialysis equipment does not have the function of stopping and changing parameters midway, and currently with the development of hemodialysis treatment technology, The number of treatment items based on the principle of hemodialysis has increased. The flow rate of the dialysate, which is internationally recognized as 500ml / min, can no longer meet the requirements of clinical treatment, and the existing technology cannot realize the clinical dialysis process according to the patient's condition (such as blood pressure, blood pressure, etc.) Pulse) to adjust the dialysate concentration online, so clinical treatment hopes to provide hemodialysis equipment that can adjust the dialysate flow rate and conductivity concentration during the dialysis process, while the existing liquid dosing and balanced supply in the dialysate circuit are respectively The method and device implemented by two devices are difficult to meet the requirements in this respect

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