CRRT is used in medicine, especially in nephrology, as a continuous renal replacement therapy (CRRT). CRRT is also used in patients with non-renal diseases who need to adjust the stability of the internal environment, and the treatment mode of CRRT is based on the molecular weight of the products to be removed, and decides whether to remove water by static-venous hemodiafiltration, continuous static-venous hemodiafiltration, dialysis and ultrafiltration, usually in two modes: connecting arterial and venous lines or venous and venous lines, among which continuous static-venous hemodiafiltration is more common. is more common.