Why we need a microcatheter ?Superselective works for
Diagnosis (DSA, CTA)
Infusion (Drugs)
Embolization
(Glue, Microsphere, G.S., Coils)
History• 颅内血管走行 Intracranial navigation
• 在70s年代标准的微球囊导管
Calibrated microballoon catheters in the seventies
• 次优结果
Suboptimal results Kerber C. Radiology 120: 547-550, 1976
Bank WO. Radiology 139: 609- 616, 1981
Kerber CW. Am J Radiol 132: 207-212, 1979
• 主要的突破在80年代
Major breakthrough, in the 80’s
• 渐进柔软微导管的使用
Use of progressive suppleness microcatheters
• 与可操纵导丝有效转矩控制相结合
Combined with effective torque control by a steerable guidewire
Taki W, et al Proceedings of the 1st Workshop on Intravascular Surgery. Nagoya, Japan 1982: 93-95
Berenstein A:. Radiology 148: 437-441, 1983
Kikuchi Y et al:. Radiology 165:870-871,1987 
• A new catheter suitable for selective angiography, embolization, and controlled infusion of chemotherapy
• Tracker ( Target Therapeutics, Los Angeles)
Kikuchi Y et al:. Radiology 165:870-871,1987
specification• （工艺）挤压出高和低密度聚乙烯复合结构 Composite construction of extruded high- and low-density polyethylene
• 从高度柔软的末端2.7F（6,12，18cm 长）到硬的近端3.0F（1.0mm）
Graded from a highly flexible, distal 2.7-F tip (6, 12, on 18 cm long) to a stiffen 3.0-F (1.0-mm) proximal section
• 导管头尖端铂金标记
Platinum marker at the tip
• 150cm long
150 cm 长
• 带锁的适配器接口
Luer lock adapter at the hub
Kikuchi Y et al:. Radiology 165:870-871,1987
• 灌注压力80 psi psi =磅力/每平方英寸=帕斯
infusion pressure of 80 psi
• 76%造影剂 8ml/min；60%造影剂10ml/min；水 34ml/min
Delivers 76% ionic contrast medium at 8 mL/min, 60% ionic contrast medium at 10 mL /min, and water at 34 mL/ min
• 地表面摩擦
Low surface friction
• 0.018 inch 可旋转导丝
0.018- inch torque guide wire
• 塑形导管头
Shapable tip
Kikuchi Y et al:. Radiology 165:870-871,1987
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