Dental handpiece with a check valve
US5464350A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1994 |
| Grant date | Nov 7, 1995 |
| Priority date | — |
| Expiry date | Aug 19, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K15/148
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dental handpiece has a coupling member in which a passage for delivering a coolant to a discharge nozzle at the head part is provided. In order to prevent a flow-back of contaminated fluid with bacteria past the handpiece, a check valve is provided and comprises a check valve member disposed in a recess that extends radially inward from an outer surface of the coupling member and receives a flexible portion for closing a portion of the passage. The flexible portion is such that when the fluid is turned off, a suction in the fluid line will cause the flexible member to be pressed against the base of the recess and to prevent dripping from the exit nozzle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.