Syringe for injecting medication with openable and closable stopper

Abstract

A syringe assembly having a barrel for storing a medication and a stopper positioned within the barrel and having an opening, the stopper separating the proximal and distal sections of the barrel. A plunger is movable axially within the barrel. A cover extends radially from the plunger, the cover movable within the barrel from an open position to a closed position, wherein in the open position the cover exposes the opening in the stopper to enable the medication to flow within the barrel from the proximal section to the distal section and in the closed position the cover covers the opening to prevent the flow of medication from the proximal to the distal section.

1 . A syringe assembly comprising:
 a) a barrel for storing a medication, the barrel having a proximal section and a distal section;   b) a stopper positioned within the barrel and having an opening, the stopper separating the proximal and distal sections of the barrel;   c) a plunger movable axially within the barrel; and   d) a cover extending radially from the plunger, the cover movable within the barrel from an open position to a closed position, wherein in the open position the cover exposes the opening in the stopper to enable the medication to flow within the barrel from the proximal section to the distal section and in the closed position the cover covers the opening to prevent the flow of medication from the proximal section to the distal section.   
     
     
         2 . The syringe assembly of  claim 1 , wherein the plunger is rotatable to move the cover between the open and closed position. 
     
     
         3 . The syringe assembly of  claim 1 , wherein the stopper is attached to the plunger and moves axially with axial movement of the plunger. 
     
     
         4 . The syringe assembly of  claim 1 , wherein the stopper includes a body portion having a dimension greater than a dimension of the cover so the cover can freely rotate within the body portion of the stopper. 
     
     
         5 . The syringe assembly of  claim 1 , wherein the cover has an open area movable into alignment with the opening in the stopper to allow the flow of medication. 
     
     
         6 . The syringe assembly of  claim 1 , wherein the cover has an opening therethrough movable into alignment with the opening in the stopper to allow the flow of medication through the openings. 
     
     
         7 . The syringe assembly of  claim 1 , further comprising a first and second set of markings on an outer wall of the barrel to indicate a dose of fluid to be injected from the barrel, the first set of markings containing numerals facing proximally and the second set of marking containing numerals facing distally. 
     
     
         8 . The syringe assembly of  claim 1 , wherein the plunger includes a cap, the cap having an indicator to indicate alignment of an opening area or an opening in the cover with the opening in the stopper. 
     
     
         9 . The syringe assembly of  claim 1 , wherein the cover is offset from a longitudinal axis of the plunger rod. 
     
     
         10 . The syringe assembly of  claim 1 , further comprising a proximal and distal seal positioned on the plunger rod. 
     
     
         11 . The syringe assembly of  claim 1 , wherein a second medication is positioned in the distal section of the barrel, and the cover is movable to an open position to mix the second medication with the medication from the proximal section. 
     
     
         12 . The syringe assembly of  claim 1 , wherein the plunger is depressable to inject the medication from the barrel and the plunger is stored in a depressed position. 
     
     
         13 . A syringe assembly comprising:
 a) a barrel for storing a medication, the barrel having a proximal section and a distal section;   b) a stopper positioned within the barrel and having an opening, the stopper separating the proximal and distal sections of the barrel, the stopper movable axially within the barrel and having an opening, the opening selectively closable and openable to allow flow of medication from the proximal section to the distal section to provide a selected dose of medication in the distal section of the barrel; and   c) a plunger movable axially distally within the barrel to inject the medication which flowed into the distal section of the barrel from the proximal section.   
     
     
         14 . The syringe assembly of  claim 13 , further comprising a cover extending from the plunger, the plunger rotatable to move the cover from a first position covering the opening in the stopper to a second position spaced from the opening to enable flow of medication through the opening. 
     
     
         15 . The syringe assembly of  claim 13 , wherein the plunger is depressable to inject the medication from the barrel and the plunger is stored in a depressed position. 
     
     
         16 - 20 . (canceled)