A needle cover is disclosed which includes an elongate rigid tubular housing having a generally cylindrical central bore. A hollow frusto-conical shaped needle guide, which gradually reduces in diameter toward the distal end of the cover is located within the housing and effectively separates the fore...http://www.google.com/patents/US5085647?utm_source=gb-gplus-sharePatent US5085647 - Rigid needle cover with needle sealing plug and method of manufacture thereof
