Isolation storage and intermixing syringe for medicants

摘要

This invention pertains to improvements in an intermixing syringe with isolation storage. The outer housing is similar to the conventional syringe and has a relatively constant diameter barrel with a hub at one end and wing portions at the other. A rigid insert is provided at the forward end of the housing, said insert made an air-tight fit by an O- ring. This insert includes a one-way valve to inhibit flow into the housing, a filter to remove all unwanted particles, a plurality of small passageways and a cone-like projection used to break a glass ampule in which the powder is stored prior to breaking and intermixing. A tubular member is slidably carried in this housing and contains the diluent. A plunger end closes this tubular member and a through passageway is closed at its lower end by a one-way valve that is closed when the plunger end is moved forwardly. A short passageway is also provided in the plunger end and provides flow communication for air from the outside into the tubular member. This passageway is closed by another one-way valve that is closed to the flow of diluent but open to an inflow of air when needed during the transfer of diluent to the housing.