초록 ▼

In a seal for two compartment mixing syringe having an outer barrel with an inner barrel partially disposed therein, and a seal on the dispensing end of the inner barrel, and a plunger disposed in the inner barrel, the improvement is wherein the seal is a combination of an aperture in the dispensing

In a seal for two compartment mixing syringe having an outer barrel with an inner barrel partially disposed therein, and a seal on the dispensing end of the inner barrel, and a plunger disposed in the inner barrel, the improvement is wherein the seal is a combination of an aperture in the dispensing end of the inner barrel and a plug disposed in the aperture. The plug has a cylindrical portion of resilient and compressible material adapted to be compressibly disposed in the aperture but displaceable from the aperture by fluid pressure exerted by movement of the plunger in the inner barrel. A reduced diameter portion of the plug provides a fluid pathway between the inner barrel and the outer barrel when the cylindrical portion is displaced from the aperture by such fluid pressure. An increased diameter portion prevents the plug from passing through the aperture and into the outer barrel.

대표청구항 ▼

In a seal for a two compartment mixing syringe having an outer barrel with a cannula end and an opposite open end, and inner barrel partially disposed within the outer barrel and having an open end and an opposite dispensing end with a displaceable seal thereon, and a plunger partially disposed with

In a seal for a two compartment mixing syringe having an outer barrel with a cannula end and an opposite open end, and inner barrel partially disposed within the outer barrel and having an open end and an opposite dispensing end with a displaceable seal thereon, and a plunger partially disposed within the inner barrel, such that when pressure is applied by digital movement of the plunger into the inner barrel to a fluid contained within a first compartment defined by the plunger and the inner barrel, the displaceable seal is displaced and the fluid in the first compartment flows into and is mixed with a material in a second compartment defined by the outer barrel and the inner barrel, and by digital movement of the inner barrel within the outer barrel the resulting mixture is passed through the cannula and out of the syringe, the improvement comprising a said seal having in combination an aperture in the dispensing end of the inner barrel and a monolithic plug made of a single resilient and compressible material and disposed in the said aperture, said plug comprising: a cylindrical portion of said resilient and compressible material with a diameter such that it is compressibly disposed in said aperture and seals said aperture against fluid leakage therethrough but is displaceable from said aperture by fluid pressure exerted by digital movement of the plunger into the inner barrel; a reduced diameter portion such that when said cylindrical portion is displaced from said aperture a fluid pathway from the inner barrel to the outer barrel is provided between the aperture and the reduced diameter portion; and an increase diameter portion with a diameter greater than the diameter of the cylindrical portion such that when the cylindrical portion is displaced from said aperture and the said fluid pathway is provided, the increased diameter portion prevents the said plug from passing through said aperture and into the outer barrel; and wherein the cylindrical portion is of such a diameter that the plug is not displaceable from the aperture until substantial fluid pressure is exerted into the first compartment and when that said substantial pressure is exceeded, the cylindrical portion quickly exits the aperture and comes to an abrupt halt when the increased diameter portion contacts the inside surface of the inner barrel dispensing end, and whereby the fluid passing from the first compartment impinges against the cylindrical portion and produces a dispersed form of the fluid which, thus, improves the mixing of the fluid with the material in the second compartment.