METERING DEVICE FOR DISPENSING PHARMACEUTICAL FLUID FROM A RESERVOIR HAVING A SPINDLE ROD FOR DISPLACEMENT OF THE PISTON

摘要

A metering device for delivering a pharmaceutical fluid, includes a reusable part and a consumable part. The reusable part includes a housing, a control unit, a driving device, and a coupling member driven by an output wheel for transmitting a drive output to a spindle device. The consumable part includes the fluid reservoir and a piston which can be advanced by the spindle device, with the spindle device disposed on the consumable part and having a spindle, and the spindle device coupled by the coupling member to the reusable part. A force sensor disposed on the reusable part is provided for indirect pressure measurement. The metering device is configured such that after partial or complete filling, the spindle device is in the retracted state. The coupling member is axially slidably mounted and the output wheel is supported by the force sensor on a fixed base.

主权项

1. A metering device for administering liquid medication to the body of a user wherein the liquid medication is dispensable in a metered manner for the purpose of an infusion or an injection from a reservoir (A) by the advance of a plunger (K) held in the reservoir (A), the metering device (D) additionally comprising:
a) a reusable part (2) comprising a housing (3), a control unit and a driving device (M) wherein the driving device (M) has a coupling element for transfer of a drive power to a spindle device (S) for advancing the plunger (K), and the coupling element is fixedly connected to an output wheel (14) of the driving device (M) and has an axial stop (12) for the spindle device (S); b) at least one disposable part (1) comprising the reservoir (A) and the plunger (K) which is held in the reservoir and can be advanced by the spindle device (S), wherein the spindle device (S) is disposed on at least one disposable part (1) and has at least one spindle drive with a path of movement (V) per spindle drive wherein the spindle device (S) of the disposable part (1) can be coupled to the reusable part (2) via the coupling element; c) a fluid-carrying connection (F) between the reservoir (A) and the user and d) a force sensor (15) disposed on the reusable part (2) which measures a reactive force of the spindle device (S) which serves as a measure of the pressure in the reservoir (A), wherein i) the metering device is designed so that the spindle device (S) of the disposable part (1) is in the retracted state after a partial or complete filling of the reservoir (A) and thus a defined total stroke (H) of the spindle device (S) 2 [sic] which is always constant can be traveled, ii) the coupling element is supported axially with a friction bearing and the output wheel (14) is supported on a fixed base via the force sensor (15) wherein because of the fixed connection between the coupling element and the output wheel (14) when the spindle drive (S) comes to rest against the stop (12) the reactive force of the spindle device (S) acting axially on the stop (12) is directed to the force sensor (15) via the output wheel (14) so that there is a direct transfer of force from the stop (12) via the output wheel (14) to the force sensor (15).