Syringe actuation device
US5800405A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1997 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Jan 30, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/1456
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A syringe actuation device includes a housing containing a spring-biased piston that applies an actuation force to a syringe plunger inserted into the housing. A pivoting mechanism causes the piston to pivot with respect to the longitudinal axis of the housing as the piston moves along that axis to actuate the plunger, whereby the axially-directed component of the force applied by the piston to the plunger remains substantially constant throughout the stroke of the piston. In one embodiment, the device comprises an internally-threaded outer sleeve having a longitudinal opening for receiving a pre-filled syringe with an extended plunger and a distal opening through which the syringe barrel extends, and an externally-threaded cylinder, containing the piston, that threads into the proximal end of the sleeve so as to bring the piston to bear against the plunger. The pivoting mechanism comprises a tapered internal diameter of the cylinder, and a sloped spring seat on the piston. In another embodiment, the device comprises a housing that contains a piston biased by a pair of springs, and a sleeve that receives a syringe barrel, with the plunger of the syringe extending from the proximal …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.