一种新型套管针用穿刺针的设计

Design of a New Puncture Needle for Trocar

目的研制一种留置针用的新型穿刺针,克服现有穿刺针性能问题,同时能够降低生产成本,增强临床操作性。方法从设计上,用实心针丝替代传统的空心管丝,用三条切割刃口替代传统的两条切割刃口,用轴刃形式(针尖处于针丝的轴线上)替代传统的背刃或边刃,用实心丝侧边上的缺槽替代传统管材上的空心及侧孔,最终形成的新型实心穿刺针是由一段具有螺旋槽的实心钢丝构成的,断面呈有缺槽的圆形且一端呈三棱形。通过实验对刚度突变和穿刺力对比分析,体现新型穿刺针的特点和优势。结果新型实心穿刺针能够实现治疗过程中的穿刺目的,能避免传统留置针用穿刺针由于刚性突变而产生的潜在风险,特有螺旋槽结构不仅能满足观察回血情况的要求,还具有降低穿刺针直径需求的空间,即具有开发更细小规格留置针产品的潜在能力。结论新型的套管针用穿刺针,从中空到实心,不仅能够满足穿刺、观察回血的基本要求,还可以避免传统穿刺针因刚度突变带来的风险。另外,这种穿刺针还具有穿刺力更小、拓展空间更大的优势。

Objective To develop a new type of puncture needle for indwelling needle,which can overcome the performance problems of the existing puncture needle,reduce producing cost,and enhance clinical operability.Methods In this design,solid needle thread is used to replace the traditional hollow pipe thread,three cutting edges are used to replace the existing two cutting edges,and the shaft edge form(the needle tip is on the needle thread’s axis)is used to replace the original back blade or edge blade;the slot on the side of the solid core wire is used to replace the hollow and side hole on the traditional pipe.Finally,a new solid core puncture needle is formed by a section of solid core steel wire with a spiral groove,the cross-section of which is a circular slotted needle with a triangular shape at one end.Through the comparative analysis of stiffness mutation and puncture force in the experiment,the characteristics and advantages of new puncture needle are reflected.Results The new solid core needle can meet the need of puncture in the course of treatment,and can avoid the potential risk caused by the rigidity mutation of the needle used in the traditional indwelling needle,at the same time,it also has the space to reduce the demand of needle diameter,that means it has the potential to develop smaller needle products.Conclusion The new type of trocar puncture needle,from hollow to solid core,can not only meet the basic requirements of puncture and observation of blood return,but also can avoid the risk of traditional puncture needle due to stiffness mutation,the utility model also has the advantages of better performance(less puncture force)and larger expansion space.