Patent ID: 6290682
Filing Date: 2001-09-18
Classification: A61M,F16K

Abstract:
An infusion set having a container for liquid medicine, which is connected to a drip chamber by a feed-line and a differential pressure valve, the dip chamber connected by a further feed-line to a front end with a roller clamp, and a syringe connected to a differential pressure valve, characterized in that the differential pressure valve having a housing, a diaphragm disk retained about the perimeter thereof by the housing, a first inlet associated with an outlet annular ridge and in fluid communication with the diaphragm disk, and a second inlet in fluid communication with the diaphragm and the outlet annular ridge and the first inlet annular ridge, wherein the differential pressure valve is configured as a 3-way check valve by the first inlet being connected to the container for the liquid medicine and the second inlet being configured for the connection to the syringe whereby under normal valve operation is not sealingly engaging the first inlet annular ridge and the outlet annular ridge such that the first inlet is in fluid communication with the outlet, and when pressure is created by the syringe between the first inlet annular ridge and the outlet annular ridge the diaphragm sealingly engages in the first inlet annular ridge, and when negative pressure is created by the syringe between the first inlet annular ridge and the outer annular ridge the diaphragm sealingly engages the outlet annular ridge.