Travelling wave magnetic valveless micropump driven by rotating integrated magnetic arrays

Micro & nano letters

article

Weixiang Ye¹  Wei Zhang¹  Cheng Wang¹  Wenbin Li¹  Zhao Yue¹  Guohua Liu¹ 

[1] College of Electronic Information and Optical Engineering, Nankai University;Key Laboratory of Photo-electronic Thin Film Devices and Technology of Tianjin, Nankai University;Department of Mechanical Engineering, Columbia University

关键词: micropumps;    microchannel flow;    magnetic fluids;    neodymium compounds;    iron compounds;    travelling wave magnetic valveless micropump;    rotating integrated magnetic arrays;    microfluidics;    permanent magnetic arrays;    elastic microchannel;    liquid particles;    magnetic micropump;    driving efficiency;    piezoelectric micropump;    flow rate;    voltage 3.7 V;    power 185 mW;    pressure 1.28 kPa;    size 200 mum;    NdFeB;   

DOI  :  10.1049/mnl.2014.0022

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Background: Spinal anesthesia is a reliable and safe technique for infra-umbilical surgeries. Preservative-free 2-chloroprocaine has re-emerged for use in spinal anesthesia. We compared onset and duration of sensory block with intrathecal use of 1% 2-chloroprocaine (30 mg) or 0.5% Hyperbaric Bupivacaine (15 mg) as primary objective. Secondary objectives being onset and duration of motor block, duration of analgesia, time to return of voiding function, hemodynamic parameters and side effects.Methodology: 90 patients of age group 18-60 years, either sex, belonging to ASA physical status I/II undergoing infra-umbilical surgeries were randomly divided into two groups, 1% 2-chloroprocaine Group A (n=45) and 0.5% hyperbaric bupivacaine Group B (n=45). Each group received intrathecally either 30 mg of 2-chloroprocaine or 15 mg of hyperbaric bupivacaine 15 mg. For statistical analysis unpaired-t-test and chi-square test were used.Results: Earlier onset and shorter duration of sensory block were observed in Group A as compared to Group B respectively (p < 0.001). Similarly, onset was earlier and duration of motor block, duration of analgesia and time to return of voiding function were shorter in Group A as compared to Group B respectively (p < 0.001). Hemodynamic parameters (HR, MAP) were comparable in both groups.Conclusion: Intrathecal 1% 2-chloroprocaine 30 mg provides spinal anesthesia of adequate duration for infra-umbilical surgeries with the advantage of earlier onset and faster regression of spinal block resulting in earlier voiding with stable hemodynamics as compared to 0.5% hyperbaric bupivacaine 15 mg.

【 授权许可】

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