Abstract: Ｏｂｊｅｃｔｉｖｅ：To investigate outcome and security  of percutaneous transluminal angioplasty (PTA) in tunnelcuffed catheter(TCC) replacement maintenance hemodialysis (MHD) patients with catheter dysfunction.
Ｍｅｔｈｏｄｏｌｏｇｙ：12 cases of catheter dysfunction MHD patients  from Oct 2017 to Oct 2019 admitted into the First Affiliated Hospital of Bengbu medical college were retrospectively analyzed.All of them underwent digital subtraction angiography (DSA) to clarify problem origin.Suitable balloons were chosen to dilate the lumen of original catheters or the occlusive veins,and then the original catheters were replaced.PTA was used to help catheter replacement and all patients were followed up for 6 months.
Ｒｅｓｕｌｔｓ：6 of the 12 patients were found stuck when replacing catheters.All of them had catheters removed successfully with PTA.All patients had catheter replacement successfully and dialyzed with blood flow volume>250 ml/min,and the primary catheter site patency rates of 12 patients with PTA at 3 and 6 months after surgery were 100%,75%.
Ｃｏｎｃｌｕｓｉｏｎ：PTA shows advantages of lesser trauma,better tolerance and higher success rate in patients with TCC dysfunction.It is an effective treatment for the vascular access depletion in MHD patients.

Key words: percutaneous transluminal angioplasty, catheter replacement, tunnel-cuffed catheter dysfunction, maintenance hemodialysis