Patent ID: 7131961

Claim:
A needle-free injection device, comprising: a nozzle including an outlet; a fluid chamber in fluid communication with the outlet and configured to store fluid to be injected, where the needle-free injection device is configured to deliver multiple injections of fluid from the fluid chamber out through the outlet of the nozzle and into one or more injection sites; a plurality of contamination barrier patches, each contamination barrier patch being adapted to allow fluid ejected at sufficient pressure from the outlet to penetrate out through the contamination barrier patch while substantially preventing fluid splashback toward the needle-free injection device, where the contamination barrier patches are provided as an elongate tape in which the contamination barrier patches are arranged edge to edge the needle-free injection device being configured so that one contamination barrier patch is provided for each injection, and for each injection, the contamination barrier patch separates away from the needle-free injection device after delivery of the injection; and a patch feed mechanism configured to enable positioning of one of the contamination barrier patches over the outlet of the nozzle for each injection to be delivered, such that when the outlet is placed near an injection site, the contamination barrier patch is positioned between the outlet and the injection site.