Plastic stopper
US9289557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2012 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Mar 28, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/31521
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A stopper adapted for attachment with a plunger rod for use within a syringe barrel includes a main body portion defining an open rearward end configured to receive the plunger rod. The main body portion is manufactured from a rigid or semi-rigid polymeric material having an elastic modulus in the range of about 0.01 GPa to about 5 GPa. When fluid pressure is increased inside the syringe barrel during an injection, at least one of the following actions occurs: a) a flexible roof of the main body portion expands in a radial direction toward an inner wall of the syringe barrel; b) a first perimetrical skirt extending around an outer circumference of the main body portion is forced against an inner wall of the syringe barrel; and c) an engagement between the plunger rod and an engagement portion provided along an inner circumference of the main body portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.