DEVICE FOR ADMINISTERING A FLUID PRODUCT

摘要

An infusion apparatus (1) for the administration of a medication from a reservoir (2) with a plug (4) moveable along a central axis in a distal direction for ejection, the apparatus comprising; a housing (5) and a drive mechanism and a force sensor (85) and a transfer element (56); wherein the drive mechanism comprises a first (51) and a second (52) conveying element, the second conveying element (52) to advance the plug (4) in the reservoir (2) in said distal direction, the first conveying element (51) limited for axial movement relative to the housing but rotatable in both senses to facilitate an ejecting or resetting movement of the second conveying element (52); wherein the force sensor (85) is arranged in the central axis between a part of the housing and the proximal end of the drive mechanism and wherein the transfer element (56) is axially stacked between the force sensor (85) and the first conveying element (51) such that the force sensor (85) bears axial forces exerted by the ejection movement; characterized in that the second conveying element (52) moves the transfer element away from the first conveying element (51) against the bias of a restoring force such that the force sensor (85) bears axial forces exerted by the resetting movement.