Abstract: unnel⁃cuffed  catheter  （ TCC）  is  an  important  vascular  access  for  hemodialysis  patients.  A  full understanding of the catheter structural design and function by the clinical operator is conducive to rational selection. The article mainly introduces the  TCC  materials，  coatings，  and  body  structures.  Currently，  TCC  material  is  mainly  carbonate polyurethane， and optimized polyurethane copolymer is  the  direction of  development.  Among  catheter  coatings， antibiotic⁃ coated and silver⁃coated catheters both reported inconsistent results， and micropatterning maybe an exploratory direction to improve the surface characteristics. Catheter tips come in a variety of forms， while symmetric tip likely perform better than stepped and bifurcated tip.  The  design  of  side  holes  is  controversial，  strategies  of  size，  shape，  and  arrangement  are  still being explored. After reviewing literatures， it is still difficult to recommend a particular TCC for hemodialysis patients， and clinical operators should pay more attention to the catheter comprehensive performance when applying.

Key words: hemodialysis ,  ,  tunnel?cuffed catheter,  ,  , structural design ,  ,  function