Rotary pump driven medicament delivery device

US11566618B2 · kind B2 · utility

Assignee

• MEDICO INVEST AG

Inventors

• Jochen Gabriel · Stuttgart, DE
• Herbert Bechtold · Ehningen, DE

Key dates

• Filing date: Aug 16, 2018
• Grant date: Jan 31, 2023
• Expiry date: Sep 23, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05C2251/02
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A rotary pump is presented for use in a medicament delivery device, where the pump has a back plate having an inner surface and a rotor housing is positioned adjacent to the back plate having a peripheral wall. A front plate support is connected to the back plate and a flexible front plate is positioned between the front plate support and the rotor housing. The pump is rotated using a planetary gear transmission, where an eccentric shaft is operatively connected to the planetary gear mechanism. A rotor is rotationally fixed to the eccentric shaft and movably positioned within the rotor housing. The rotor has three lobes, where each lobe has two peripheral curved surfaces sharing a common apex, where a first portion of each peripheral surface adjacent to the apex defines a non-smooth curve.