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1. (WO2017036965) DOSING UNIT WITH LOW RADIAL SEALING FORCES DURING STORAGE

Pub. No.:    WO/2017/036965    International Application No.:    PCT/EP2016/070200
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Aug 27 01:59:59 CEST 2016
IPC: A61M 5/315
Applicants: ROCHE DIABETES CARE GMBH
F. HOFFMANN-LA ROCHE AG
ROCHE DIABETES CARE, INC.
Inventors: NIKLAUS, Hanspeter
Title: DOSING UNIT WITH LOW RADIAL SEALING FORCES DURING STORAGE
Abstract:
The present disclosure is directed towards dosing unit (1) for use in an ambulatory infusion system, the dosing unit (1) including: a dosing cylinder (11) and a piston (12), the piston (12) being arranged inside the dosing cylinder and in a sliding displaceable manner along a displacement axis (A). The piston (12) is convertible form a storing configuration into an operational configuration, wherein a circumferential sealing member (121) of the piston (12) is mechanically relieved in the storing configuration and is in sealing and sliding engagement with a circumferential inner surface of the dosing cylinder (11) in the operational configuration. The dosing unit (1) includes a configuration switch member (3) in operative mechanical coupling with the piston (12), the configuration switch member (3) being movable relative to the piston (12) from a storing position into an operational position, thereby switching the piston configuration from the storing configuration to the operational configuration.