At present, except for the patented product, all others are side hole double sleeve structures. This product is an integrated cavity groove conformal structure (VK1), which is significantly ahead of double sleeves in terms of easy placement, shear resistance, non adhesion, anti clogging, negative pressure matching, flexibility, and easy pull-out. In terms of functional diversity, it absolutely surpasses the mainstream cross groove pipes and spiral groove pipes that can only be drained. This product consists of a liquid stop clamp, connecting tube, negative pressure drainage bag, cross valve, special connector, Y-shaped three-way pipe, one-way valve, locking cap, drainage catheter, and identification point.