Patent · US Active

Syringe piston with check valve seal

US8574201B2 · kind B2 · utility

8Cited by

193References

10Claims

0Family size

Assignee

MEDTRONIC MINIMED, INC. · US

Inventors

Sarnath Chattaraj · Simi Valley, US
Poonam S. Gulati · Tustin, US
Lance P. Hoffman · West Hollywood, US
Kiem H. Dang · Thousand Oaks, US

Key dates

Filing date	Dec 17, 2010
Grant date	Nov 5, 2013
Priority date	—
Expiry date	Jan 14, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49826
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A fluid syringe of the type used with fluid infusion devices is presented here. The fluid syringe generally includes a barrel, a piston, and a check valve seal. The barrel has an interior wall and a sealed main fluid chamber. The piston is slidably coupled within the barrel, and the piston has a piston seal forming an interference fluid seal against the interior wall. The check valve seal is coupled to the piston, and it is located between the piston seal and the main fluid chamber. The check valve seal forms an interference fluid seal against the interior wall when the piston is unloaded, and it disengages the interior wall to allow gas flow from the main fluid chamber toward the piston seal when the piston is loaded.

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