涤纶膜外套式镍钛合金室间隔缺损封堵器的制作

目的 探索制作涤纶膜外套式镍钛合金室间隔缺损(ventricular septal defect,VSD)封堵器的方法.方法 按照市售常规镍钛合金VSD封堵器稍微牵拉的形状制作蜡模型,使用医用4-0缝合线在固定于编网机上的蜡模型上进行经编,制作成蜡模-涤纶膜复合体,然后脱蜡和脱脂,制成纯涤纶膜外套.将市售镍钛合金VSD封堵器置入涤纶膜外套内,膜外套两端缝合在铆钉上,多余部分用高温刀切割.结果 使用编网机可以成功编织出涤纶膜外套,其主要参数为腰部直径8 mm,两端盘片直径12 mm,并且能和直径8 mm市售镍钛合金VSD封堵器腰部和盘片完全匹配.应用缝合的方法,可以将涤纶膜外套与VSD封堵器紧密地缝合在一起.高温刀切割使两端多余涤纶线平齐、凝固,无散丝、脱线.结论 使用涤纶线经编的方法可以编织与镍铁合金VSD封堵器相匹配的涤纶膜外套,通过缝制和热切割等工艺,可以成功制作出涤纶膜外套式镍钛合金VSD封堵器.

Design and preparation of medical polyester-coated nitinol ventricular septal defect occluder

ObjectiveTo design and prepare a polyester-coated nitinol ventricular septal defect (VSD) occluder. MethodsThe shape wax model was made by slightly stretching the shape of the commercially available nitinol VSD occluder. The wax model was fixed on the weaving machine and a wax model-polyester coat compomer was made using the medical 4-0 sutures by warp knitting method. Then dewaxing and defatting were done and the polyester coat was produced. The commercially available nitinol VSD occluder was placed into the coat by sheath, with the ends of the polyester coat sutured at the VSD stainless steel rivets, and the surplus parts of both ends were cut by high-temperature knife. ResultsThe polyester coat of VSD occluder was successfully made by weaving machine and warp knitting method. Polyester coat had a waist diameter of 8 mm and a disc diameter of 12 mm, and it completely fit with the conventional nitinol VSD occluder with diameter being 8 mm. The polyester coat was sutured tightly with the VSD occluder, and the surplus parts of two ends of the VSD occluder were cut smooth by high-temperature knife, with no loosening of the wire. ConclusionThe polyester coat of nitinol VSD occluder can be woven by the weaving machine and warp knitting method, and then the polyester-coated nitinol VSD occluder can be successfully made by suture and high-temperature cutting.