A single-use indicator is provided and is particularly well suited for use with a surgical catheter device. The indicator includes an absorbent filament or wick which is placed in a transparent or translucent indicator lumen of a multi-lumen catheter. The lumen is provided with at least one side port....http://www.google.com.au/patents/US8157747?utm_source=gb-gplus-sharePatent US8157747 - Single-use indicator for a surgical instrument and a surgical instrument incorporating same
