GB2550924A — Improvements in or relating to transdermal delivery

USPTO Abstract

A needle delivery device (10) comprises a needle assembly (4, 5), a drive mechanism (2, 3) and a contact member (6). The drive mechanism (2, 3) includes a drive member (2) which is linearly moveable upon rotation of the drive member (2), preferably with a screw thread formation driven by a motor. The contact member (6) is positioned between and abutting the needle assembly (4, 5) and the drive member (2). The contact member (6) may have a low friction surface and is configured to provide only linear motion to the needle assembly (4, 5) upon rotation of the drive member (2) so as to drive movement of the needle assembly (4, 5) between a distal and proximal direction relative to the needle delivery device (10). Also claimed is a plunger for a syringe, where the plunger rod 21 is flexible and connected at one end to an actuator 26. The syringe and needle may be combined in a single auto injector, optionally with an electronic controller unit, which may provide multiple injections at various depths.