Andre Larsen,Lasse Wengel Christoffersen,Mikael Andersen,Jan Harald Preuthun
申请号：
US13497472
公开号：
US20120271249A1
申请日:
2010.09.20
申请国别(地区):
US
年份:
2012
代理人:
摘要：
A regular metallic, cylindrical tubular needle cannula (1) is subjected to a metal etching liquid (21) in the inside lumen (4) thereby increasing the inside diameter and enhancing the flow properties while maintaining the outside appearance. The inside diameter is only increased over a controlled length (7) of the full length of the needle cannula (1) leaving sufficient length and wall thickness to also taper the outside diameter.
