Patent · US Active

Syringe spring retainer

US8021333B2 · kind B2 · utility

45Cited by

17References

16Claims

0Family size

Assignee

UNITRACT SYRINGE PTY LTD · AU

Inventors

Joseph Hermes Kaal · Maitland, AU
Craig Stephen Thorley · Maitland, AU

Key dates

Filing date	Mar 19, 2004
Grant date	Sep 20, 2011
Priority date	—
Expiry date	Feb 23, 2028

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61M2005/3231
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A spring retainer (60) for a syringe (10) that has a barrel (40), a plunger (20), a spring (90) and a retractable needle (50) that can couple with the plunger for spring-driven retraction of the coupled needle and plunger. The spring retainer has first (70) and second (80) body members that cooperate to releasably maintain the spring in a compressed state until the plunger is coupled to the retractable needle after depression of the plunger to deliver the fluid contents of the syringe. Depression of the plunger triggers rotational disengagement of the first and second body members to allow decompression of the spring which forces retraction of the needle into the barrel. Rotational disengagement of the first and second body members also assists rotation of the plunger into a final, inoperable position.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.