The safety device of the instant invention is equipped with a fluid absorbable material at the portion of the sheath that meets the tip portion of the needle so that, as the sheath is pivoted to a position in substantial alignment with the needle, whatever fluid that has been collected at the needle...http://www.google.es/patents/US5993426?utm_source=gb-gplus-sharePatente US5993426 - Fluid absorbable needle sheath
