A micro-catheter including an inner primary liner and a plurality of concatenated tubes is provided. The primary liner extends substantially from the proximal end to the distal end of the catheter. Each of the tubes has a respective inner surface that is fused to the outer surface of the primary liner....http://www.google.de/patents/US6186986?utm_source=gb-gplus-sharePatent US6186986 - Micro-catheters and methods of their manufacture
