Hypodermic syringe needle guard
US5334155A · kind A · utility
Inventor
Key dates
| Filing date | Apr 6, 1993 |
| Grant date | Aug 2, 1994 |
| Priority date | — |
| Expiry date | Apr 6, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/3257
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A needle guard for a hypodermic syringe to prevent repuncture by a used needle. The needle guard comprises a flexible double-walled membrane which is shaped to define a closed toroidal chamber which, under atmospheric pressure, is conical in shape and defines a hollow interior with an opening thereto for passage of the needle. The toroidal chamber is partially evacuated and folded inwardly upon itself with a needle passing through the opening for normal use of the needle. Upon release of the partial vacuum, the entrance of air into the toroidal chamber effects expansion of the needle guard into the shape of a cone with the needle contained within the hollow interior thereof so that needle-stick or re-use of the needle may be prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.