Medical Device Including An Air Evacuation System

摘要

Medical device assemblies capable of aspirating liquid into a syringe barrel or other medical devices while evacuating any air from the syringe are described. An exemplary medical device includes a syringe barrel, plunger rod and stopper assembly having an air permeable and liquid impermeable porous portion and structure for forming a vacuum within either the stopper or the plunger rod. Described is a medical device including a syringe barrel, plunger rod and stopper assembly having an air permeable and liquid impermeable porous portion and structure for forming a vacuum within chamber between the stopper and plunger rod wherein the plunger rod includes a sealing edge and is moveable relative to the stopper. Exemplary medical devices may include a vent for allowing air that permeates through the porous portion to escape to atmosphere. Methods for aspirating a syringe barrel with a liquid are also provided.

主权项

1. A medical device comprising:
a syringe barrel including a side wall having an inside surface defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall with a tip extending distally therefrom having an open passageway in fluid communication with said chamber; a plunger rod comprising a proximal end, a distal end and a body extending from the proximal end to the distal end, the plunger rod disposed within the chamber and moveable in the proximal and distal direction within the chamber; a stopper assembly disposed within the chamber and moveable in the proximal and distal direction within the chamber, the stopper assembly forming a fluid-tight seal with the inside surface of the syringe barrel, a stopper including a distal face, a proximal end, an expandable portion adjacent to the proximal end comprising a pump body having a distal end attached to the proximal end of the stopper and a proximal end defining a plunger-engaging portion attached to the proximal end of the plunger rod, the pump body comprises a valve and a valve opening disposed at the proximal end of the pump body in fluid communication with the pump cavity, the valve configured to open upon application of a force in the distal direction on the plunger rod and close upon release of the force in the distal direction on the plunger rod; and a porous portion associated with the stopper to permit air to flow into the stopper cavity and to prevent liquid from entering the stopper cavity, the plunger rod and stopper configured to create a pressure differential between the stopper cavity and a portion of the chamber extending from the distal wall and the distal face of the stopper assembly.