Safety syringe
US5531692A · kind A · utility
Inventor
Key dates
| Filing date | Oct 6, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Oct 6, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/3234
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A safety syringe including a generally cylindrical needle body having first and second opposite ends, the first end being open, a needle member extending from the second end of the needle body, a plunger having a central bore and piston secured to an end of the plunger, the plunger and piston being inserted through the first end of the needle body, the piston sealingly engaging an inner surface of the needle body, a stylette having a sharp point, the stylette extending through the needle member, penetrating through and frictionally engaging the piston and extending into the central bore of the plunger, wherein the sharp point of the stylette is normally retracted into the needle member to prevent needle-stick injuries, and extends from the needle member upon applying a biasing force to the piston by depressing the plunger, whereby frictional engagement between the piston and the stylette forces the sharp point to be exposed from the needle member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.