对称式单支点离心泵心脏辅助装置特性  

A Monopivot Centrifugal Blood Pump with Symmetric Structure: Preliminary Study

作　　者：李国荣[1] 田步升 陈海丰 朱晓东[1] 

机构地区：[1]中国医学科学院,中国协和医科大学心血管病研究所,阜外心血管病医院,北京100037 [2]长治市久安人工心脏科技开发有限公司,山西长治046000

出　　处：《中国医疗器械信息》2018年第1期44-46,126,共4页China Medical Device Information

基　　金：山西省重点研发计划(指南)项目(项目编号:201703D321030)

摘　　要：目的:分析对称式亚悬浮离心泵心脏辅助装置提高血泵的抗血栓性的可行性。方法:设计对称式亚悬浮离心泵。离心泵壳分为前端的离心泵筒和后端的叶片腔,叶轮由前端的转子柱和后端的叶片连接构成。叶片腔的后壁中心设置导流椎体,顶端设置支点球和支点球窝形成机械支点支撑叶轮尾端;叶轮转子柱前端设置径向磁悬浮环,与离心泵筒前端的径向悬浮共同形成径向永磁轴承。叶轮为直叶片且以中心对称辐射状排列,离心叶轮、离心泵壳、泵入口及泵出口均为左、右对称结构。文章中研制了两种样机,叶片直径分别为15和17mm,叶轮转子柱直径均为8.5mm,长56mm,离心泵筒外径20mm内径12mm。叶轮叶片采用5叶片式,宽度8mm。叶片腔内径25mm,长9mm。所有血液接触面均采用医用钛合金包被。泵总长度68mm,总重量87g。结果:径向永磁轴承稳定维持叶轮前端的径向悬浮和轴向位置,无论顺时针和逆时针旋转,离心泵均可产生相同的流体输出。在100mm Hg输出压力条件下离心泵可产生5L/min流量。直径17mm叶轮和15mm叶轮的转速分别为7000r/min和8500r/min。总输入功率分别约为8.3和8.1w,改变叶轮旋转方向可在大约2s内重新达到稳定输出,在此期间输出压力和流量显著下降。叶轮转换方向时可使离心泵功耗短暂增加至11W,随后回复至8W左右。结论:对称结构磁悬浮离心泵流体力学特性可满足左心辅助需要,流体力学特性在改变旋转方向条件下不变,转子-叶轮体交替旋转的驱动策略可行。Objective： A symmetric monopivot centrifugal pump（SMCP） is proposed and evaluated in this study. Methods： The pump hull of the SMCP is formed by a circular impeller house connecting to an entrance tube. A rotor-impeller, a rotor bar linked to a four-blades impeller, is located inside the pump hull with the axis aligned, and supported by a mechanical pivot at rear and a passive magnetic suspending bearing at front. The clearance of the rotor bar and the inner wall of the entrance tube serves as the fow path conducting blood from inlet mouth into the impeller house. The pump hull, the outlet cannula and the rotor-impeller with its straight blades are all arranged symmetrically about the longitudinal section plan of the pump. This geometric symmetry make possible for the impeller to rotate either in clockwise or anticlockwise direction, producing identical hydraulic output. A prototype was fabricated and evaluated in a mock circulation with water. The rotor bar is 8.5mm in diameter and 76mm in lengthen while the entrance tube with an inner diameter of 12mm and an outer diameter of 20mm, and the impeller house is 25mm in diameter. Two types of impeller with diameter measuring 15mm and 17mm respectively were fabricated for comparative study, both with blades width of 8mm. The total length of the pump is 68mm, weighting around 87g. Result： The passive radial magnetic bearing provided steady suspension for the rotor-impeller in its front. As anticipated, the pump exhibited identical hydrodynamic performance no matter what is the impeller rotational direction. The pump could produce 5L/min fow rate against a pressure head of 100mmHg, respectively at 7000r/min for the 17mm impeller and at 8500r/min for the 15mm impeller. The power supply is about 8.3 and 8.1W respectively. The reversion of impeller rotational direction could be completed within about 2 second, with a temporarily pressure descending and fow stop. The fow rate and head pressure reached steady state again within about 3 second. The power supply rai

关 键 词：心脏辅助装置 磁悬浮 离心血泵 人工心脏 心功能衰竭 

分 类 号：R541.6[医药卫生—心血管疾病]