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Warning: mktime() [function.mktime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 60

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 61

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止回阀兼具防虹吸及开启压力低的特点 - China Medical Device Manufacturer
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Fri, January 19th, 2018

2008年1/2月CMDM电子快讯 » 技术新知
止回阀兼具防虹吸及开启压力低的特点

SiphonSafe阀适用于婴儿和儿童患者的静脉治疗,并可用于需要对药物剂量进行精确控制的领域。
为防止液体从静脉给药装置中回流,目前市售防虹吸阀的开启压力通常在1.5至5.0 psi之间。Filtertek B.V.公司(爱尔兰,Co. Limerick,Newcastle West: www.filtertek.com )开发出了可在更低开启压力下达到同样保护效果的止回阀。SiphonSafe阀的开启压力在35 至78 cmWg之间,相当于0.5 至 1.1 psi。该产品可能会给对血管系统压力增加敏感的患者带来福音。

防虹吸阀出现于20世纪90年代中期,当时美国FDA和ECRI规定静脉给药装置中必须包含回流保护设备。重力给药装置中使用的标准阀的开启压力较低。相反地,防虹吸阀却要求有高开启压力。这就会带来很多问题,尤其是当该阀与注射泵相连时。

注射泵必须产生足够的压力,以应对液体流动前给药装置中压力的下降。Filtertek公司的产品开发工程师Kieran Costello解释道:注射泵通常都带有阻塞报警装置,如果给药装置内达到某个特定的压力,该泵便会停止工作,并发出警报。为了使带有常规防虹吸阀的泵能正常工作,就必须增高阻塞报警级别。因此,给药装置中的压力就会相应增加。 Costello说,这便会给血管易受损伤的患者及婴儿和儿童患者带来不便。高压力也削弱了医务人员对液体流动的控制程度。这给要求剂量控制精确的高效力药物的给药带来了麻烦。

Filtertek公司目前正对该阀门进行市场兴趣评估。据该公司称,一些给药装置制造商测试了该产品,并对结果表示满意。


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