HP’s inkjet tech seeks to replace hypodermic needles. CNETNews.Sept.11,2007. What else can inkjet technology be used for? Injecting drugs into humans, according to Hewlett-Packard. The company is licensing a medical patch it has developed to Ireland’s Crospon that potentially can replace hypodermic needles or pills for delivering vaccines or other types of medication to patients. The patch contains up to 90,000 microneedles per square inch, microprocessors and a thermal unit. [ See ]