Patent ID: 9205198
Filing Date: 2015-12-08
Classification: A61J,A61M,B05B,B65D,G01F

Abstract:
1. A multiple dose syringe comprising: a first valve defining a first valve opening pressure; a storage chamber for storing multiple doses of a substance therein, and a storage chamber outlet for dispensing multiple doses of the stored substance therethrough; a second valve in fluid communication with the storage chamber outlet and defining a second valve opening pressure; a compression surface movable between first and second positions; a compression chamber, the compression surface and the first valve being located at opposing ends of the compression chamber and defining the compression chamber therebetween; wherein (i) movement of the compression surface in a direction from the first position toward the second position creates a pressure differential across the first valve exceeding the first valve opening pressure and dispenses a dose of substance in the compression chamber through the first valve and out of the syringe, and (ii) movement of the compression surface in a direction from the second position toward the first position creates a pressure differential across the second valve exceeding the second valve opening pressure and causes another dose of substance to flow from the storage chamber through the second valve and into the compression chamber; and a connector located on a distal end of the syringe downstream of the first valve and adapted to connect an administering member thereto for administering the dispensed dose of substance to a patient; wherein the first valve includes a relatively rigid valve seat, an elastic valve member that engages the valve seat and forms a normally closed, axially-elongated valve seam that substantially prevents the passage of substance therethrough when a pressure differential across the first valve is less than the first valve opening pressure, and allows the passage substance therethrough when a pressure differential across the first valve exceeds the first valve opening pressure; at least one of (i) the elastic valve member defines a progressively decreasing wall thickness in a direction from an inlet toward an outlet of the valve seam, and (ii) the valve seat defines a progressively increasing width or diameter in a direction from the inlet toward the outlet of the valve seam; and the first valve is configured to maintain the compression chamber and any substance therein sealed from the ambient atmosphere throughout dispensing of substance through the outlet of the valve seam; and wherein the outlet of the valve seam is in fluid communication with at least one of (i) the connector; and (ii) an administering member connected to the connector without any structure therebetween.