Multi-functional Active Catheter

为了在血管中进行诊断和治疗的目的，已经开发了可以在血管中移动并到达身体中的某个部分（例如，大脑内部）的有源导管。基于半导体微加工的微机械加工已被应用于它们的制造。主动导管中分布有许多形状记忆合金（SMA）线圈，可以像蛇一样灵活地弯曲。还开发了导管用传感器，开发了具有用于通信和控制的集成电路的有源导管（外径为2.3mm），因此仅需要三根公共引线。还开发了不仅能弯曲而且能伸展和扭转的多功能有源导管（外径1.4 mm）。多功能有源导管采用电镀和其他工艺批量制造。此外，使用蚀刻的薄SMApla制造了有源导丝（外径0.5 mm） ...更多信息 te.主动导管的外筒采用薄的内衬线圈，主动导管的传感器也已研制成功。一个是位于有源导管末端的前视超声成像仪（外径3 mm），用于辅助导航。研制了一种用于超声波脉冲传输的热继电器。对压电材料（PZT）的微细加工进行了研究。采用硅熔模工艺，以微加工硅为模具烧结PZT，成功地实现了PZT的压电特性，并采用硅深反应离子刻蚀（RIE）工艺制作了光纤端部有薄膜片的光纤精细（外径125 μm）压力传感器。在主动导管末端制作三轴磁场传感器，以了解导管尖端在体内的位置和方向，利用紫外连续激光器进行激光辅助化学气相沉积（CVD），实现微组装和选择性金属化。这些研究成果在一次脑血管内治疗会议上得到了医生们的高度评价。少

Active catheters which can move in a blood vessel and reach some part in a body(for example inside a brain) have been developed for the purpose of diagnosis and therapy in a blood vessel. Micromachining based on a semiconductor micro fabrication has been applied for their fabrication. Many actuators made of shape memory alloy(SMA) coil rare distributed in the active catheter and hence it can bend flexibly like a snake. Sensors for the catheters have been developed as well.Active catheters(2.3 mm in outer diameter) having integrated circuits for communication and control and hence needs only three common lead wires have been developed. Multi-functional active catheters( 1.4 mm in outer diameter) which can not only bend but also extend and twist have been also developed. The Multi-functional active catheters have been fabricated in batch process using electroplating and other processes. Furthermore active guide wires(0.5 mm in outer diameter) have been fabricated using etched thin SMApla … More te. Thin outer tube having liner coil was fabricated for the active catheter.Sensors for the active catheters have been developed. One is a forward looking ultrasound imager (3 mm in outer diameter)at the end of the active catheter to assist their navigation. Thermal micro relay as a multiplexer for the transmitting ultrasonic pulse has been developed. Micromachining of a piezoelectric material(PZT) has been studied. Silicon lost mold process for the PZT which uses micromachined silicon as a mold for sintering was developed and achieved piezoelectric characteristics successfully.Fiber optic fine(125 μm in outer diameter) pressure sensor which has a thin diaphragm at the end of a optical fiber was fabricated by applying silicon deep reactive ion etching(RIE). Three axis magnetic field sensor was fabricated at the end of en active catheter was fabricated to know the position and the direction of the catheter tip in the body.Laser assisted chemical vapor deposition(CVD) using ultraviolet CW laser was developed for micro assembly and selective metalization. These research results presented in a conference for the therapy inside brain blood vessel were highly evaluated by medical doctors. Less