An improved injection device has a casing containing an active substance reservoir, a cannula communicating with the reservoir, a device for inserting the cannula, and pump means for discharging the reservoir contents through the cannula. The cannula 11 is fixed relative to the casing and projects beyond...http://www.google.es/patents/US5931814?utm_source=gb-gplus-sharePatente US5931814 - Dermally affixed injection device
