Development of manufacturing system of micro medical forceps as 0.3mm in diameter aiming

1. 本研究的目的和背景内窥镜由于其微创的特性，在医学检查和治疗中越来越普遍。许多类型的内窥镜治疗医疗设备是可用的，其中，最常用的是镊子。目前产钳的尺寸在1.2mm以上，开发制造更多的小尺寸产钳，如0.3mm，将有助于微医疗。此外，镊子价格总体较高，其中一个原因可归因于制造方法。目前钳子零件都是通过切割或金属去除工艺制造的。通过用模具成形代替这些方法，稳定的低成本供应应该是可能的。本研究的目的是为了降低制造成本，实现夹具的小型化，开发一种模具成形的制造方法。本研究针对医用镊子，设计了钳爪部分（尺寸分别为0.3mm和1.0mm）、形状设计、强度分析和模具成型工艺。将0.3mm、1.0mm颌面微钳与其他部件完全组装，并确认其功能。通过以上案例分析，得出以下结论：(1)针对通常最难成形的颚形零件，提出了一种采用级进模的模具成形方法，实验表明该方法是可行的。(2)提出了一种校正颌骨形状的方法。(3)提出了一种评估颚部强度的方法。(4)尝试了一种用弹簧环、摩擦焊装配钳子的方法。在此基础上，提出了自动装配方法。在今后的工作中，需要对实际医疗中使用镊子时出现的问题进行审查。

1. Purpose and Back ground of this researchMedical examinations and treatments using endoscopes are becoming increasing common due to their minimally invasive nature. Many types of medical devices for endoscopic therapy are available, and of these, forceps are most frequently used. The size of forceps is over 1.2mm, and then development of fabrication on more small sized forceps such as 0.3mm will contribute for micro medical treatment. Furthermore, the forceps prices are on the whole high, and one of the reasons for this can be attributed to the manufacturing method. Currently forceps parts are made by cutting or metal removal process. By replacing these methods with die forming, stable supply at low costs should be possible. The object of this research is developing a manufacturing method of forceps by die forming method in order to reducing the manufacturing cost and miniaturization.2. Research resultsIn this study, for medical forceps, grasping jaw part (size is 0.3mm and 1.0mm), shape design, strength analysis, and die forming procedures are planned. Micro forceps of with 0.3mm, 1.0mm jaw was completely assembled with the other parts and their function were confirmed. Furthermore followings are obtained as the results of above case study.(1) For the jaw which is usually most difficult to form, a. die forming method using a progressive die was proposed, and experiments showed that the method is feasible.(2) A method for correcting the jaw shape was proposed.(3) A method for evaluating the strength of the jaw was proposed.(4) A method for assembling forceps using spring ring, friction welding is tried. Furthermore automatic assembling method is proposed.In future works, problems occurring in actual medical treatments using forceps will need to be reviewed.