Blood collecting syringe
First Claim
1. A blood collecting syringe comprisinga cylindrical barrel having a duct at a distal end for connection to a blood sampling system;
- a hollow deformable stopper defining a discard chamber therein and being slidably mounted in said barrel to move between a first position adjacent said distal end and a retracted position spaced therefrom to define a specimen collecting chamber therebetween;
a valve in a distal end of said stopper to permit a flow of fluid into said stopper; and
a plunger slidably mounted in said barrel and connected to said stopper, said plunger being movable between a first position compressing said stopper into a longitudinally collapsed state and a second position remote from said distal end of said barrel to move said stopper into said retracted position whereby upon movement of said plunger from said first position toward said second position thereof and expansion of said stopper from said collapsed state, fluid from a blood collecting system connected to a patient is drawn into said discard chamber in said stopper and upon movement of said stopper from said first position thereof fluid from the sampling system is drawn into said specimen collecting chamber.
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Accused Products
Abstract
The blood collecting syringe is constructed for coupling with an arterial blood sampling system. In one embodiment, upon retraction of a plunger, a collapsed hollow deformable stopper expands to draw any air bubble and fluid into a small discard chamber within the stopper. Continued retraction of the plunger causes the stopper to also retract thereby forming a specimen collecting chamber within the distal end of the barrel for receiving whole blood from the sampling system. In another embodiment, the plunger has a cap mounted within a hollow stopper so that upon movement of the cap from a forward position within the stopper to a retracted position within the stopper, a discard chamber is formed within the stopper while at the same time, any air bubble and fluid is drawn into the discard chamber. Subsequent movement of the plunger also causes retraction of the nozzle thereby opening up a blood specimen collecting chamber. In each embodiment, an anti-blood clotting agent is disposed between a distal face stopper and the barrel for dissolving in a blood specimen drawn into the specimen collecting chamber.
66 Citations
15 Claims
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1. A blood collecting syringe comprising
a cylindrical barrel having a duct at a distal end for connection to a blood sampling system; -
a hollow deformable stopper defining a discard chamber therein and being slidably mounted in said barrel to move between a first position adjacent said distal end and a retracted position spaced therefrom to define a specimen collecting chamber therebetween; a valve in a distal end of said stopper to permit a flow of fluid into said stopper; and a plunger slidably mounted in said barrel and connected to said stopper, said plunger being movable between a first position compressing said stopper into a longitudinally collapsed state and a second position remote from said distal end of said barrel to move said stopper into said retracted position whereby upon movement of said plunger from said first position toward said second position thereof and expansion of said stopper from said collapsed state, fluid from a blood collecting system connected to a patient is drawn into said discard chamber in said stopper and upon movement of said stopper from said first position thereof fluid from the sampling system is drawn into said specimen collecting chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A blood collecting syringe comprising
a cylindrical barrel having a duct at a distal end for connection to a blood collecting system; -
a hollow stopper defining a discard chamber therein and being slidably mounted in said barrel to move between a first position adjacent said distal end and a retracted position spaced therefrom to define a specimen collecting chamber therebetween; a valve in a distal end of said stopper to permit a flow of fluid into said stopper; and a plunger slidably mounted in said barrel and having a cap at a distal end slidably mounted within said stopper, said plunger being movable between a first position with said cap disposed in a forward position within said stopper and a second position with said cap disposed in a retracted position within said stopper to define a discard chamber within said stopper and to draw a flow of fluid from a blood collecting system connected to a patient into said discard chamber, said plunger being movable between said second position thereof and a third position to move said stopper from said first position thereof to said retracted position thereof to draw a flow of fluid from the sampling system into said specimen collecting chamber. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification