Dual chamber syringe with manually actuated, chamber isolation valve

A syringe comprising:

• a substantially cylindrically shaped barrel, which defines an inner side wall, the barrel having an open proximal end, and a distal end, the distal end of the barrel including a connector defining an outlet lumen therethrough, the outlet lumen in fluid communication with an interior of the barrel, the interior defined by the open proximal end, the distal end, and the inner side wall;
• nested primary and secondary plungers, disposed within the barrel interior, respectively having primary and secondary plunger rods capable of selective translation within the barrel interior along a common axis, the primary plunger having a hollow tubular plunger rod defining a cam slot with open and closed engagement surface portions;
• a primary stopper coupled to a distal end of the primary plunger, the primary stopper having a proximal end surface facing the proximal end of the barrel and a distal end surface facing the distal end of the barrel, the primary stopper defining a through aperture between its proximal and distal end surfaces, in fluid communication with the outlet lumen;
• a secondary stopper coupled to a distal end of the secondary plunger, the secondary stopper having a distal end surface facing the distal end of the barrel;
• a rescalable valve oriented within the tubular, primary plunger rod, axially offset, along the common axis, toward the distal end of the barrel away from the distal end surface of the secondary stopper, the rescalable valve having an inlet in fluid communication with the distal end surface of the secondary stopper and an outlet in fluid communication with the through aperture of the primary stopper and the outlet lumen, the rescalable valve having a spring-loaded, reciprocating needle aligned along the common axis, the needle opening the valve in an open engagement position and the needle closing the valve in a closed engagement position, with a radially projecting cross-pin retained with the cam slot, a tip of the needle abutting a valve seat formed in the proximal end surface of the primary stopper when the cross pin is oriented in the closed engagement surface portion of the cam slot and the needle tip axially spaced away from valve seat when the cross pin is oriented in the open engagement surface portion thereof;
• a primary fluid chamber within the barrel interior, defined between the distal end surface of the primary stopper and the distal end of the barrel, volume of the primary fluid chamber being selectively variable by translation of the primary plunger rod;
• and
• a secondary fluid chamber, within the barrel interior, defined between the distal end surface of the secondary stopper and the valve inlet, in fluid communication with the valve inlet, volume of the secondary fluid chamber being selectively variable by translation of the secondary plunger rod;
• and
• wherein, when the valve is closed the secondary fluid chamber is isolated from the outlet lumen, so that translation of the primary plunger rod only aspirates fluid into or dispenses fluid out of the primary chamber, via the outlet lumen;
• and
• wherein, when the valve is open the secondary fluid chamber is in fluid communication with the outlet lumen, so that translation of the secondary plunger rod aspirates fluid into or dispenses fluid out of the secondary chamber, via the outlet lumen.