~ ~ ~
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 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 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 60

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

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 62

Deprecated: Function ereg_replace() is deprecated in /var/www/custom/archive.cmdm/article.php on line 102
模拟骨骼的新型材料应用于生物医学植入物领域 - China Medical Device Manufacturer
CMDM

- English | 中文

Wed, January 17th, 2018

2010年9月CMDM电子快讯 » 技术新知
模拟骨骼的新型材料应用于生物医学植入物领域

一种“金属泡沫”具有与骨骼相似的弹性模量,它可以促进生物医学植入物的开发,以防止骨骼排斥反应。排斥反应在更硬质的植入物材料(如钛)中较为常见。北卡罗来纳州立大学(美国北卡罗来纳州,Raleigh;www.ncsu.edu)的研究人员开发出了这种金属泡沫,其质量较固体铝轻,可以采用100%的铁或铁和铝的合金制成。

研究人员报道称这种新型复合泡沫除具有高能量吸收能力和轻质特点外,其“弹性模量”也与骨骼类似。据科学家称,泡沫的粗糙表面还可以促进植入物中骨骼的生长,改善植入物的强度。本文的作者之一——北卡罗来纳州立大学机械和航天工程学系副教授兼生物医学工程系成员Afsaneh Rabiei说道,弹性模量的测量单位是千兆帕(GPa),它是生物医学植入物至关重要的参数。

Rabiei解释说,“当整形或牙科植入物置入体内替代骨骼或部分骨骼时,它需要与其周围的骨骼一样承担重量。如果植入物的弹性模量远高于骨骼的弹性模量,则植入物将会取代骨骼的负重功能,从而导致周围的骨骼坏死。这会使植入物放松,导致其最终失效。这种现象称为‘压力防护’。此时,患者将需要进行补救性手术替换植入物。我们的复合泡沫可与周围骨骼完美契合,以防止压力防护。”

为帮助您了解骨骼的弹性模量和传统植入物的弹性模量之间的差异,骨骼的弹性模量在10至30 GPa之间,而钛的模量近100 GPa。新型复合泡沫的模量与骨骼一致,它的孔隙较多,因此相对较轻。

“金属泡沫的粗糙表面将与周围的新生骨骼形成良好的接合,使体液进入其表面孔隙内,”Rabiei说。“这将增加植入物在体内的机械稳定性和强度。”

版权所有 © 2005-2010 医疗设计和制造OEM (CMDM) 本网站所有内容,如未获书面同意,不得以任何形式转载和节录。违反上述声明者,我方将依法追究法律责任。

本期其他技术新知

- 主页 | 当期杂志 | 订阅 | 联系方式 | 关于我们 -©2011 汇科传讯集团 医疗设计和制造OEM 版权所有.