Multi-functional Active Catheter

主动导管可以在血管中移动并到达身体的某些部位（例如大脑内部），已被开发用于血管的诊断和治疗。基于半导体微加工的微机械加工已被应用于它们的制造。许多由形状记忆合金（SMA）线圈制成的驱动器很少分布在主动导管中，因此它可以像蛇一样灵活弯曲。导管的传感器也被开发出来了。有源导管（外径2.3毫米）具有用于通信和控制的集成电路，因此只需要三根普通引线。多功能主动导管（外径1.4 mm）不仅可以弯曲，还可以伸展和扭转。采用电镀和其他工艺批量制备了多功能活性导管。此外，有源导丝（外径0.5 mm）已使用蚀刻薄SMApla制造。为主动导管制作了带有内衬线圈的薄外管。有源导管的传感器已经开发出来。一种是在主动导管末端安装前视超声成像仪（外径3毫米），以辅助导尿管导航。热微继电器是一种用于传输超声脉冲的多路复用器。对压电材料的微加工进行了研究。开发了以微加工硅为烧结模具的PZT硅失模工艺，成功地实现了压电特性。采用硅深反应离子刻蚀（RIE）技术制备了外径为125 μm的光纤精密压力传感器，该传感器在光纤末端有一个薄膜片。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。研究了紫外连续波激光辅助化学气相沉积（CVD）技术用于微组装和选择性金属化。这些研究成果在最近举行的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