West Pharmaceutical Services patented a piston manufacturing method involving molding a partially formed piston body and then molding the piston. The process includes using rubber sheets, inert film, and forming tools to create a piston with specific features like a central face portion and rib. GlobalData’s report on West Pharmaceutical Services gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on West Pharmaceutical Services, Wearable drug delivery devices was a key innovation area identified from patents. West Pharmaceutical Services's grant share as of April 2024 was 51%. Grant share is based on the ratio of number of grants to total number of patents.

Manufacturing piston using two forming tools and rubber sheets

Source: United States Patent and Trademark Office (USPTO). Credit: West Pharmaceutical Services Inc

A recently granted patent (Publication Number: US11951289B2) discloses a method for manufacturing a piston, particularly for use in syringes. The method involves a multi-step process that includes vulcanizing rubber sheets and inert films between die plates to form the piston body, joining multiple piston bodies together, and blanking out the final piston from rubber sheets. The design of the piston includes specific features such as a sealing portion, a rib, and a trim edge, all aimed at optimizing the functionality and fit of the piston within the syringe barrel. The patent also emphasizes the importance of maintaining a fluid-tight seal between the piston and the inner wall of the barrel, achieved through precise design elements and material selection.

Furthermore, the patent extends to the design of the syringe itself, highlighting the interaction between the piston and the barrel. The piston design includes a cylindrical portion, a central face portion, and an annular curved portion, all enclosed by an inert film. The specific dimensions and orientations of these components are crucial to ensuring a proper fit within the syringe barrel while maintaining a fluid-tight seal. The patent also emphasizes the minimization of contact between the inert film and the inner wall of the barrel to prevent any interference with the functionality of the syringe. Overall, the patented method and design offer a unique approach to manufacturing pistons for syringes, focusing on precision, functionality, and efficiency in the medical device industry.

To know more about GlobalData’s detailed insights on West Pharmaceutical Services, buy the report here.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.