Device for continuous renal replacement therapy (CRRT)

Abstract

The invention relates to a device for continuous renal replacement therapy (CRRT). The device comprises a blood loop, a blood purifier, a blood pump, a dialysate loop, a dialysate pump, a controller and a flow monitor; wherein the controller is used for adjusting a solution supply pump or a dewatering pump or uttering an alarm according to results of the flow monitor in monitoring of the dialysate loop. The problem that the accuracy of a CRRT machine in a volumetric metering technology is affected by multiple factors can be solved, and the constant and precise liquid flow can be ensured in the dialysate loop.

Description

Technical field [0001] The invention relates to the field of medical technology, in particular to a continuous renal replacement therapy device. Background technique [0002] Since Dr. Kramer first applied continuous arteriovenous hemofiltration (CAVH) to the clinic in 1977, continuous renal replacement therapy (Continuous Renal Replacement Therapy, CRRT) technology has developed rapidly, and its application in critically ill patients is considered It is one of the important developments of ICU in recent years. [0003] The so-called CRRT (ie continuous renal replacement therapy) is the English abbreviation for continuous renal replacement therapy. Also known as CBP (continue blood purification); bedside blood filtration. The definition is a long-term, continuous extracorporeal blood purification therapy that uses 24 hours a day or close to 24 hours a day to replace impaired renal function. [0004] The clinical application goal of a continuous renal replacement therapy machine (C...

AI Technical Summary

Problems solved by technology

[0011] (3) When there are tiny debris flowing through the pump with the liquid, it will hang on the check valve. When there are tiny debris on the surface of the check valve, it will cause the check valve to fail to operate completely and cause a large error

However, when the speed is too low or the internal pressure of the cavity changes rapidly, the water seal effect disappears, causing the liquid to flow out of the cavity through the gap, and the volume flowing through the pump becomes smaller, and when the pump speed is too fast, the cavitation effect will occur, that is, When the plunger is retracted too quickly, the liquid cannot flow into the cavity in time, causing an instantaneous negative pressure in the cavity, causing the gas dissolved in the liquid to escape from the liquid, and a large amount of gas accumulates in the cavity, resulting in serious flow errors;

[0014] (2) The type B pump is obviously affected by the inlet and outlet pressure. During the treatment process, the height of the liquid bag connected to the outside of the machine or the smoothness of the liquid passage will directly affect the accuracy, and because the pump accuracy is also affected by the outlet pressure, During the treatment process, the pressure of each fluid channel is largely affected by the degree of blood coagulation and the patient's physical condition, so the outlet pressure of the pump cannot be guaranteed to be constant, resulting in the uncertainty of the flow error;

[0015] (3) Due to the structural characteristics of this type B pump, the only effective monitoring method is to judge the number of movements of the plunger by monitoring the number of movements of the rotating parts, so as to infer the flow of the pump, and the actual flow of the liquid cannot be directly monitored, so there are serious hidden dangers ;

[0016] (4) The gap between the plunger and the cylinder liner of this type B pump is very small, and tiny impurities and liquid crystals will cause the plunger and the cylinder liner to be stuck and unable to rotate. After the blockage, the pump body needs to be disassembled and soaked in pure water for a long time In order to ensure that the pump does not get stuck, a continuous renal replacement therapy machine (CRRT) using this technology in the market needs to keep the machine filled with liquid, that is, the cavity of the pump and the inlet and outlet are sealed with liquid, but This practice has potential safety hazards, does not meet the development direction of blood purification hygiene requirements, and cannot guarantee that the liquid will not be lost after the machine is stored for a long time

[0017] In conclusion, the existing continuous renal replacement therapy machine (CRRT) adopts the volumetric metering technology, the structure of the plunger pump is complex, the volume accuracy is affected by many factors and the control system cannot directly measure the flow change, only by monitoring the plunger pump Therefore, when the flow error occurs, the system still calculates the flow by the number of actions, which will lead to a very large error. Only when the plunger changes the mechanical structure of the pump due to mechanical or other factors, the system can make a judgment. Therefore, in the face of flow errors, the existing CRRT machine cannot respond and adjust in time, and there is a great potential safety hazard

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