Syringe
US4795444A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Apr 23, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/341
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A syringe having a barrel fitted with a plunger and a nozzle in which the barrel comprises PA0 a hollow cylindrical portion and a tubular portion which is thinner than the cylindrical portion and connected to one end of the cylindrical portion, PA0 the other end of said cylindrical portion is an open end, and PA0 at least a part of the cylindrical portion adjacent to the open end has a diameter larger than that of one end of the plunger to be inserted in the barrel so that air present between the end of the plunger and the top surface of a medicament in the barrel can vent through the enlarged diameter part when the plunger is pushed into the barrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.