POST 00420E : NEEDLE-FREE INJECTOR FOR MASS IMMUNIZATION CAMPAIGN
Follow-up on Posts 00405E, 00408E, 00411E and 00417E
A Call to the International Public Health Community by the Needle Free Team
at PATH
31 January 2002
___________________________________________________________________________
The Needle Free Team at PATH completely supports full field safety trials
to address the issue of cross contamination. It is for this reason that we
have asked the international public health community to weigh in on this
issue.
Field trials (such as those conducted in Brazil) are currently being
discussed with WHO, however it is important for the community to agree with
the final protocol once it is available for comments and input.
The BI-3M application was submitted to the USFDA at the request of WHO, in
order to determine the extent by which the FDA would consider contamination
and safety issues. We now ask the international public health community to
guide final determination of safety with regard to this device. The target
applications for this technology are mass immunization campaigns in the
developing world, where additional factors need to be considered beyond
what an industrial nation like the USA would consider.
With regard to the comparison with the Ped-O-Jet®, the injector design has
a completely different nozzle to patient interface. There is NO direct
contact between the nozzle orifice and the injection site in the skin, but
rather there is a single use, auto-disable barrier "cap" with a thin film
barrier placed in between the nozzle orifice and injection site. As the
injection stream passes from the nozzle orifice into the protector cap, it
passes first through the film barrier, creating a hole slightly larger than
the injection stream itself. The injection stream then passes through
several millimeters of air space (contained within the cap) before entering
the skin. The possibility of contaminants retracing the path through the
protector cap (including the small hole in the barrier film) is remote.
Darin Zehrung
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