CAJ | 학술논문

为检验新型瓣膜的疲劳磨损特性,采用 TH-2200型人工心瓣疲劳寿命测试仪对聚甲醛瓣叶的双叶心脏瓣膜进行加速疲劳实验,并对疲劳后的瓣膜进行扫描电镜检测,发现该瓣膜经4×108次疲劳测试后,瓣环无明显磨损,瓣叶转动灵活,心瓣正常工作,但在瓣环枢轴坑的部分位置发现少量粘附的聚甲醛颗粒,尺寸约0．1~1μm,瓣叶总磨损率为0．681％.虽然新型瓣膜疲劳实验证明了瓣膜结构设计合理,能够满足国家标准要求的疲劳寿命,但是仍需要对瓣叶材料表面进行处理,进一步提高瓣叶的耐磨性.
위검험신형판막적피로마손특성,채용 TH-2200형인공심판피로수명측시의대취갑철판협적쌍협심장판막진행가속피로실험,병대피로후적판막진행소묘전경검측,발현해판막경4×108차피로측시후,판배무명현마손,판협전동령활,심판정상공작,단재판배추축갱적부분위치발현소량점부적취갑철과립,척촌약0．1~1μm,판협총마손솔위0．681％.수연신형판막피로실험증명료판막결구설계합리,능구만족국가표준요구적피로수명,단시잉수요대판협재료표면진행처리,진일보제고판협적내마성.
In order to test the fatigue wear characteristics of the new valve,TH-2200 fatigue life tester was used for an artificial bileaflet heart valves with polyformaldehyde (POM)leaflets to have accelerated fatigue tests, surface topography was detected by scanning electron microscopy (SEM).After the 4×10 8 times fatigue tests, it was shown that no significant wear on the valve ring,valve leaflets rotated flexibility and the heart valves worked well,but a small POM pit adhesion was found in the valve ring part of the pivot position,POM parti-cles size was about 0.1-1 μm,leaflets total wear rate was 0.681%.Although the new valve fatigue test showed that the valve had reasonable structural design,which could meet the requirements of national standard fatigue life,but the valve still need to surface treatment,to improve the wear resistance of the valve leaflets.