摘要目的 评价所研制的眼科强力恒磁铁系列的磁力及临床应用效果.方法 根据眼科不同部位异物摘出需要及眼部组织解剖学特征,以钕铁硼为磁源,设计并制作眼科强力恒磁铁系列,包括眼科大磁铁、眶内异物磁铁及眼内异物磁铁3个类别6个型号.将此系列磁铁用于眼部磁性异物摘出手术,观察异物摘出情况及手术并发症情况.结果 眼科恒磁铁系列经WT10A特斯拉计测量,显示有较强的磁力,眼科大磁铁Ⅰ型磁力为900 mT[1 mT(Tesla)=10 Gs(Gauss)],眼科大磁铁Ⅱ型磁力为800 mT,眶内异物磁铁磁力为450 mT,眼科笔式磁头磁力为570 mT,眼科针式磁铁磁力为30 mT.应用该系列磁铁对137例(145眼)不同部位眼部磁性异物进行手术,异物摘出成功138眼,成功率为95.17％.随访3～6个月,未发生因应用磁铁而造成的并发症.结论 眼科强力恒磁铁系列具有较强的磁力,能够顺利摘出眼睑、眶内及眼球内的磁性异物,而且手术创伤小、成功率高、并发症少.是眼部磁性异物摘出手术较好的工具.

abstractsObjective To evaluate the magnetic force and clinical efficacy of a series of ophthalmic powerful permanent magnet,which were designed and developed by the authors.Methods According to the requirements of the extraction of the foreign bodies of various location in the eye and the ocular anatomical characteristics,a series of ophthalmic powerful permanent magnet were designed.Including giant ophthalmic magnet,magnet for orbital foreign body and magnet for intraocular foreign body.Six types of magnet were made in those 3 categories.Nd-Fe-B (neodymium iron boron) was used as the magnetic sourc.Those series of magnets were used for the extraction of magnetic ocular foreign body.The procedure of foreign body extraction and surgical complications were observed.Results The ophthalmic powerful permanent magnet series showed strong magnetic force measured by WT10A teslameter.The magnetic force of type I ophthalmic magnet was 900 Tesla (mT,1 mT =10 Gs),and the force of type Ⅱ was 800 mT.The magnetic forces of the magnet for orbital foreign body,the pen type ocular magnetic head and the needle type magnet were 450 mT,570 mT and 30 mT respectively.One hundred and forty-five eyes of 137 cases with ocular magnetic foreign bodies were operated using the series of magnets.Foreign bodies were successfully removed from 138 eyes,and the success rate was 95.17％.During the follow-up of 3-6 months,no ocular complication caused by the use of magnets was found.Conclusion The ophthalmic powerful permanent magnet series have strong magnetic force.And they can smoothly extract the magnetic foreign bodies in eyelid,eyeball and orbit,with high success rate and less complications.They are ideal surgical tools for the extraction of ocular magnetic foreign bodies.