Hand-operated syringe pumping system

US6405897B1 · kind B1 · utility

Assignee

• Automatic Bar Controls, Inc. · US

Inventors

• Antonio J. Jepson · Dixon, US
• Juha K. Salmela · Citrus Heights, US

Key dates

• Filing date: Oct 3, 2000
• Grant date: Jun 18, 2002
• Expiry date: Oct 3, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B67D2001/0827
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A dispensing apparatus includes a chamber cavity having an inlet with an inlet check valve and an outlet with an outlet check valve. The outlet check valve is openable to permit flow substantially only in a direction from the chamber cavity out through the outlet check valve. The inlet check valve is openable to permit flow substantially only in a direction through the inlet check valve into the chamber cavity. A plunger is movable in the chamber. When the plunger is moved from a dispense position to a fill position away from the outlet and inlet check valves, it opens the inlet check valve and closes the outlet check valve and draw fluid through the inlet check valve into the chamber cavity. When the plunger is moved from the fill position to the dispense position toward the outlet and inlet check valves, it closes the inlet check valve and opens the outlet check valve and dispense fluid from the chamber cavity out through the outlet check valve. The outlet check valve is configured to close in a delayed fashion when the plunger moves from the dispense position to the fill position to allow a drawback flow from the outlet into the chamber cavity to prevent leakage and buildup of f…