Device for dispensing a liquid or a cream in small-volume drops, and an associated dispensing assembly
US5024355A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1989 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Dec 20, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/028
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present dispenser device is designed in particular for eye treatment and comprises a pump body including a pump chamber, a piston slidable within the chamber and extended beyond the chamber by a rod pierced by a channel capable of communicating with the chamber, and an endpiece fixed to the rod and having a dispensing orifice in line with the channel of the rod. In addition to the above conventional items, the dispenser has a chamber admission valve which is constituted by co-operation between the enclosure defining the pump chamber and the piston which engages therein or projects therefrom as the case may be. The co-operation is preferably via a sealing lip. This disposition makes it possible to dispense a drop whose volume as determined by the capacity of the chamber is very small. In addition, the piston is returned to its rest position with the admission valve closed by resilient means disposed between the pump body and the endpiece. This guarantees that only drop is dispensed at a time. Finally, an outlet valve is placed between the end of the channel in the rod and the dispensing orifice of the endpiece in order to ensure that a dispensed drop is slightly precompressed. T…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.