Andreas Katerkamp,Volker Schumacher,Robert Klug,Martin Sippel
申请号：
US12936570
公开号：
US08551059B2
申请日:
2009.04.08
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A spinal cannula with a needle hub having a transparent area for observing the liquor flowing through a hollow cavity of the needle hub. A structure for refracting or reflecting rays of light is provided in or at the transparent area of the needle hub. The structure for refracting or reflecting rays of light may be formed as one or more prisms.
