Syringe assembly having disabling mechanism
US7407495B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2007 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Feb 5, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/5073
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A syringe assembly having passive disabling structure includes a barrel and a plunger rod assembly. The plunger rod assembly includes a plunger rod and a stopper connected by an indexing locking element. The number of strokes of the syringe plunger before the stopper is locked into the barrel rendering the syringe assembly unusable is determined by the number of detents on the plunger rod and stopper which engage the locking mechanism. Upon completion of the final delivery stroke, any attempt to withdraw the plunger rod from the barrel will cause the locking element to engage the barrel and trap the stopper in the barrel preventing further use of the syringe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.