Patent ID: 9289562
Filing Date: 2016-03-22
CPC Classification: A61M

Claim Text:
1. A fluid pressure actuated valve for use in a conventional medical syringe comprising a barrel having a hollow, elongated internal cylindrical surface which is contiguous to an open proximal end and to a distal end having a closed interior about an orifice through which fluid is transferred, said valve comprising: a body for disposal within the barrel for dividing the barrel into a proximally disposed chamber wherein a diluent can be disposed and a distally disposed chamber wherein a drug to be mixed can be disposed, said body being cylindrically shaped and sized to be slideably displaced along the surface and function as syringe plunger while being so displaced; said body being made from two separate parts, each part being made from syringe plunger material which is incompressible, pliant and elastic, each of said parts comprising complimentary geometry by which the two parts are joined and sealed together to become a single unit comprising a common external surface which encloses a hollow internal cavity; each of said two separate body parts further comprising a medially disposed elongated hollow tube, which comprises a hollow communicating pathway, a pathway of one tube being sized and shaped to be to be inserted to sealingly and slideably engage the other tube, thereby forming an internal closed surface for said sealed hollow cavity, said cavity being filled with compressible matter disposed at a predetermined pressure when the two parts and associated tubes are joined and to also thereby provide a common pathway for fluid flow through the valve; a displaceable stopper comprising a bulging part sized and shaped to occlude said pathway which, in a first valve-closed-state is disposed to occlude the common pathway and in a second valve-open-state is displaced from the pathway to permit fluid flow there through; and said body further comprising distal and proximal faces which interface with the distal and proximal chambers, respectively, said faces comprising thinned portions collectively providing distortable structure about said hollow cavity such that fluid pressure within said chambers at a predetermined amount greater than the predetermined pressure effects distortion of said proximal face of said body and concurrent displacement of said bulging part of said stopper part which is displaced from said pathway causing the valve to transition from the first valve-closed-state to the second valve open state permitting fluid flow through the valve.