Device for dispensing drops of small volume, in particular for ophthalmological care
US5207659A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1992 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Apr 1, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/028
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A device for dispensing of small volume comprises a pump associated with a container of the substance to be dispensed, the pump comprising: a hollow pump body; and a piston sliding inside said pump body in sealing contact with the pump body around a circular periphery of diameter D2; wherein the pump further includes: a push rod including a central channel in which a valve seat is formed, the push rod sliding in contact with the pump body around a circular periphery of diameter D1 less than D2; a punch secured to the piston and capable of bearing in sealed manner against the valve seat; and resilient means urging the piston against the valve seat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.