Nested Molded Piston Parts For Multi-Chamber Syringes
AssigneeThome Intellectual Property Holdings, LLC
InventorsGale Harrison Thorne, JR., Gale Harrison Thorne
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Abstract
Nested piston apparatus is disclosed for making free pistons used to provide multi-chamber mixing and sequential delivery syringes within conventional syringe barrels. Each such syringe comprising one or more free pistons made according to the instant invention whereby syringe contents are selectively kept disparate until acted upon by forced displacement of an associated plunger rod. As well, nested piston apparatus is disclosed for using nested piston apparatus as multiple free pistons for making triple chamber syringes.
Claims11
A nested piston apparatus system comprising:
- a conventional medical syringe comprising a piston rod, a piston rod piston and an associated elongated barrel;
- and
- at least one nested piston apparatus disposed within said barrel, each said apparatus comprising a plurality of pistons nested together to thereby comprise a single free piston which when disposed in said barrel divides a single chamber within said barrel into a proximal and a distal chamber, each of said pistons comprising structure which is not conducive to being formed as part of another piston within the apparatus;
- each said apparatus comprising a distal piston and a proximal piston wherein each of said distal and proximal pistons comprise at least one wiping ring;
- at least one of said plurality of pistons comprising a valve which is normally closed such that fluid within the barrel distal from the free piston is kept disparate from fluid proximal from the free piston and is selectively opened to be permissive to fluid flow from a more proximal chamber.
A nested piston dual-chamber piston apparatus which is provided unfilled and dry to a user, each such chamber being maintained in a sterile state while being filled with a liquid medication within a potentially contaminating environment for later use as a syringe which dispenses only liquids.
Dependencies are inferred from the claim text.