A tissue penetrating system includes a plurality of cartridges each with a distal port and a proximal port. A plurality of penetrating members are provided, each coupled to a cartridge and having a sharpened distal tip and a shaft portion slidably disposed within the cartridge. A seal is formed by a...http://www.google.es/patents/US7229458?utm_source=gb-gplus-sharePatente US7229458 - Method and apparatus for penetrating tissue
