Dental syringe safety sheath with modified duckbill valve
US5542845A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1994 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Aug 11, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C1/16
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dental syringe safety sheath having a modified duckbill valve for minimizing cross-contamination between dental patients is provided. The sheath includes a generally tubular body member having a nozzle engaging portion and a discharge portion. The nozzle engaging portion is configured to substantially fit over and cover the nozzle of a dental syringe having a discharge orifice. The discharge portion defines a fluid passageway having an inlet adjacent the discharge orifice and outlet downstream therefrom. The fluid passageway progressively narrows in cross-section between the inlet and the outlet to form a substantially wedge-shaped cavity terminating in a slit disposed between a pair of opposing sealing lips. The cross-section of the sealing lips between the ends of the slit is wider than the corresponding cross-section of the sealing lips at the lip margins. As an additional or alternative feature of the present invention, the collective width of the sealing lips measured along a discrete portion of the lips between the ends of the slit being at least as great as the length of the lips measured along the slit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.