Two-dose syringe
US4439184A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | May 3, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3132
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A syringe for delivering two separated bodies of fluid comprising: a first piston for separating the two bodies of fluid; a second piston for pushing the two bodies of fluid out of the syringe; and a fluid chamber having a no-pass zone in which the pistons can slide and which has a cross section that each of the pistons substantially fills, preventing the passing of fluid around the pistons when they are in the no-pass zone, an output zone to direct fluid pushed out of the syringe by the pistons, and a bypass zone, for receiving the first piston, which connects the no-pass and output zones and which has a cross section that the first piston is unable to fill, so that when the first piston enters the bypass zone the fluid between the first and second pistons can pass around the first piston to the output zone. In a preferred embodiment the bypass zone has ridges projecting in from its wall, which push portions of the first piston away from that wall, allowing fluid to flow around the first piston; the output portion forms a nozzle designed to fit into, and make a seal with, a urethra; and the two bodies of fluid are a lubricating antiseptic and a lubricating anesthetic for use in pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.