Single use disposable needleless injector
US5334144A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1992 |
| Grant date | Aug 2, 1994 |
| Priority date | — |
| Expiry date | Oct 30, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/583
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A single use needleless hypodermic injector includes an elongate housing with a proximal end, a distal end, an axis and a hollow bore therethrough. The housing has a reservoir at the distal end with a generally cylindrical chamber for containing an injectable liquid. The chamber has a axis aligned with the housing longitudinal axis. The chamber has a first open end adjacent the housing with a resilient stopper mounted therein. The reservoir has a distal second end with an orifice in fluid communication with the chamber. The resilient stopper seals the chamber and ejects the liquid from the chamber, forming a stream at the orifice when the stopper is moved distally in the chamber. The injector has an piston mounted for axial movement within the housing bore and elements to axially bias the piston distally within the bore. The piston has an armed position wherein it is positioned proximally within the bore. The injector has elements to retain the piston in the armed position and to release the piston from the armed position. When the injector release elements are released, the piston moves distally to engage and move the resilient stopper distally, ejecting the liquid in the chamber …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.