Pharmaceutical syringe piston

US11607498B2 · kind B2 · utility

Assignee

• West Pharmaceutical Services, Inc. · US

Inventors

• Jeffrey M. Laubach · Emmaus, US
• Jurgen Brinkhues · Aachen, DE
• Heike Gruen · Aachen, DE
• Joel Worman · Palm Harbor, US
• Xia Zhao · Highland Park, US
• Jason Mattia · Downingtown, US

Key dates

• Filing date: May 31, 2022
• Grant date: Mar 21, 2023
• Expiry date: May 31, 2042

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2205/0222
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A piston to be provided within an inner wall of a barrel of a pharmaceutical syringe for dispensing medicament retained in the barrel is described. The piston includes a body defining a central face, a cylindrical portion, and an annular curved portion between the cylindrical portion and the central face portion. The piston also includes an inert film enclosing the central face portion and at least a part of the annular curved portion. The cylindrical portion and the part of the annular curved portion are together configured to maintain a fluid-tight seal with the inner wall of the barrel. A pharmaceutical syringe is described for dispensing a medicament includes a barrel configured to retain the medicament and the piston.