微动加压胫骨型髓内钉的设计和应用

目的研制一种新型的、简单的、有效的髓内内固定器械-微动加压胫骨型髓内钉(MCTIN),并分析其临床治疗特点。方法自2002年8月～2004年5月采用该钉治疗胫骨骨折33例,并进行随访。结果微动加压胫骨型髓内钉固定术后骨折全部临床愈合,愈合时间3～8个月,平均4.5个月。膝关节伸屈功能及行走正常,未发生针道感染、膝关节疼痛,无延迟愈合和不愈合,无髓内钉疲劳断裂及再骨折发生。结论该钉通过纵向与髓腔内壁紧密贴合,对髓腔内壁加压,形成多点、面弹性固定,控制骨折断端旋转及短缩,并对断端产生应力刺激,消除各种不利骨折愈合应力的干扰,固定效果可靠。同时,采取闭合穿钉最大限度地保护了骨折端的血运,为骨折愈合提供了优良的生物学环境。该器械结构合理、安全、简单、实用,经临床应用效果较好。是治疗胫骨骨折的新型髓内内固定器械。

Preparation and thixoforging of semisolid billet of AZ80 magnesium alloy

Semisolid billet of AZ80 magnesium alloy was prepared by new strain induced melt activated (new SIMA) process and thixoforging experiment was performed.The results show that after as-cast AZ80 magnesium alloy is processed by equal channel angular extrusion, microstructure is refined well due to heavy dynamic recrystallization occurring in severe plastic deformation.Compared with semisolid isothermal treatment and conventional SIMA, semisolid billet with fine and spheroidal grains are achieved in new SIMA.Thixoforging process of semisolid billet prepared by new SIMA has many advantages such as good surface quality of final component, high ability to fill cavity and net-shape.The fine and spheroidal grains and high mechanical properties such as tensile strength of 298 MPa and elongation of 28% can be developed in final part thixoforged.

带锁持续加压外固定器的研制及临床应用

目的研制一种符合骨折愈合生长规律,并能促进骨折愈合的外固定装置,用于治疗开放性长骨骨折,使其达到骨折愈合快并且固定可靠的目的。方法此外固定器采用锁定滑动设计,对骨折端能微动持续加压。自2002年1月～2006年1月,用该外固定器治疗开放性长骨骨折56例。结果53例获随访,骨折愈合时间2～5个月,平均愈合时间3.5个月。骨折全部愈合,术后针道感染4例,无深部感染及骨不愈合。结论带锁持续加压外固定器使用方便,有滑动、加压双重功能,可行静、动力固定转换,符合骨折生长规律,可促进骨折愈合,是治疗胫腓骨开放性骨折理想的外固定器之一。