PTCA balloon catheter with small entry profile, more confident in cross complex lesions; dual-layer balloon design enables high RBP of 22atm, ensures safety use of the balloon under high pressure. Low compliance allows precise dilation and decrease vessel injury risks. It shows improved deliverability with dual-layer distal inner shaft design which improves trackability; stiff outer shaft design avoids kink under high pressure. Fluorine containing inner shaft minimize wire-balloon friction.