PISTONS FOR DRUG ADMINISTRATION DEVICES

Abstract

A piston configured according to the present invention provides geometric optimizations to minimize the amplitude and variability of friction during use by maintaining low deformation under significant extrusion forces. More specifically, piston embodiments according to the present invention minimize the contact area between the piston and a syringe or chamber, while also maintaining high contact pressures to preserve container closure integrity. Furthermore, the piston embodiments are configured to have minimal or no increase in the contact area under the high loads associated with the administration of viscous products.