title: Hydrodyamical assessment of valve prosthesis made of expanded ultra-microporous Teflon in vitro.
abstract: OBJECTIVE
  To assess the hydrodynamical performance of the valve prosthesis made of expanded ultra-microporous Teflon in vitro.
  
  
  METHODS
  Sheets of the expanded ultra-microporous Teflon were sewn onto flexible bracket to prepare artificial valve prosthesis. The leakage and steady flow of the valve prosthesis was tested in vitro with Baxter valve prosthesis as control.
  
  
  RESULTS
  The rate of leakage of this new valve prosthesis was similar to that of Baxter valve prosthesis (P>0.05), and the systolic pressure gradient of the former was much lower than control(P<0.05).
  
  
  CONCLUSIONS
  This new artificial valve prosthesis has good in vitro hydrodynamical properties, which are superior to Baxter valve.
authors.affiliation: Department of Cardiothoracic Surgery, Nanfang Hospital, First Military Medical University, Guangzhou 510515, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liang
authors.forename: Wu-Jun
authors.initials: WJ
authors.lastname: Wang
authors.forename: Kai-Can
authors.initials: KC
authors.lastname: Cai
mesh_terms: D006350:Heart Valve Prosthesis / Q000592:standards*; D011138:Polytetrafluoroethylene
chemical_list: D011138:Polytetrafluoroethylene