Multi-Chamber Syringe Having a Gas Separator
First Claim
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1. A multi-chamber syringe apparatus for sequentially dispensing medical fluids, said apparatus comprising:
- a syringe barrel which is concentrically disposed about an elongated medial axis, said barrel comprising an open proximal end and a distal end having a closed interior surface about an orifice through which fluid is transferred, said surface having a substantially concave shape;
a plunger and plunger stopper combination disposed to be displaced within said barrel for dislocating fluid thereby; and
a valve assembly disposed within said barrel between said plunger stopper and said distal end to provide a proximal chamber between the valve assembly and plunger stopper and a distal chamber between the valve assembly and said interior surface;
said valve assembly comprising;
a valved stopper comprising a distal face and a hollow, grooved, cylindrical interior which opens proximally toward said plunger stopper and which communicates with said plunger stopper via fluid within the barrel, therebetween, to be displaced as the plunger stopper is displaced;
said valved stopper further comprising an operable, normally closed valve, which permits displacement of fluid therethrough only when open, and a pliable material whereby said distal face cooperatively conforms to the shape of the interior surface when forced thereupon; and
a valve actuator comprising features which are complimentary to grooves of the interior of the valved stopper whereby the actuator is securely affixed to the valved stopper and is displaced as the valved stopper is displaced;
said actuator further comprising structure for sensing impact between said distal face and said interior surface and, upon sensing the impact, reactively causes said valve to open.
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Accused Products
Abstract
A syringe is partitioned into at least proximal and distal chambers to provide a multi-chamber, sequentially dispensing syringe apparatus. The syringe includes a gas separator that prevents gas from exiting a chamber with delivered fluid.
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Citations
19 Claims
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1. A multi-chamber syringe apparatus for sequentially dispensing medical fluids, said apparatus comprising:
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a syringe barrel which is concentrically disposed about an elongated medial axis, said barrel comprising an open proximal end and a distal end having a closed interior surface about an orifice through which fluid is transferred, said surface having a substantially concave shape; a plunger and plunger stopper combination disposed to be displaced within said barrel for dislocating fluid thereby; and a valve assembly disposed within said barrel between said plunger stopper and said distal end to provide a proximal chamber between the valve assembly and plunger stopper and a distal chamber between the valve assembly and said interior surface; said valve assembly comprising; a valved stopper comprising a distal face and a hollow, grooved, cylindrical interior which opens proximally toward said plunger stopper and which communicates with said plunger stopper via fluid within the barrel, therebetween, to be displaced as the plunger stopper is displaced; said valved stopper further comprising an operable, normally closed valve, which permits displacement of fluid therethrough only when open, and a pliable material whereby said distal face cooperatively conforms to the shape of the interior surface when forced thereupon; and a valve actuator comprising features which are complimentary to grooves of the interior of the valved stopper whereby the actuator is securely affixed to the valved stopper and is displaced as the valved stopper is displaced; said actuator further comprising structure for sensing impact between said distal face and said interior surface and, upon sensing the impact, reactively causes said valve to open. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multi-chamber syringe apparatus for sequentially dispensing medical fluids, said apparatus comprising:
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a syringe barrel having an internal surface which is concentrically disposed about an elongated medial axis, said barrel surface comprising an open proximal end and a distal end having a closed interior about an orifice through which fluid is transferred; a stem and plunger combination disposed to be displaced within said barrel by application of a directional force against said stem for dislocating fluid thereby; and
a valve assembly which, when disposed within said barrel between said plunger stopper and said distal end, provides a proximal chamber between the valve assembly and plunger stopper and a distal chamber between the valve assembly and said closed interior surface;said valve assembly comprising; a valved stopper comprising a normally closed, medially disposed valve in a distal face of the stopper and a hollow, grooved, cylindrical interior which opens proximally toward said plunger and which communicates with said plunger stopper via fluid, within the barrel, said valved stopper being distally displaced toward said distal end within said barrel when acted upon by a force directionally applied toward said distal end which produces a first differential pressure and being proximally displaced away from said distal end when acted upon by an oppositely directed force of a second differential pressure; and said valved stopper further comprising structure which only opens said valve to permit fluid flow there through when said stopper is acted upon by force of a third differential pressure which is in the same direction as force from the first differential pressure, the magnitude of the third differential pressure being greater than the first differential pressure. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification