Combined dental syringe and needle shield
US5088988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3104
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A safety dental syringe of the type adapted to receive a medication cartridge therein but having a protective needle shield thereon which is movable between a retracted position wherein the needle is exposed and a locked and extended position wherein the needle is protected and the needle shield is prevented from returning to the retracted position. A collar is attached to the distal end of the dental syringe to selectively engage a key on the needle shield as the needle shield is moved between the retracted and extended positions. The needle shield slides longitudinally between the retracted and extended positions and may be rotated about the barrel of the dental syringe to lock the needle shield in the locked and extended position. A locking mechanism is disclosed which preferably includes a series of ramps and slots adapted to engage portions of the keys on the needle shield to retain the needle shield in the locked and extended position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.