Anesthetic Syringe

Abstract

A syringe assembly for dispensing medicine from a cartridge having a diaphragm and a piston opposite the diaphragm. The assembly includes a barrel having a hollow interior, an open proximal end, a closed distal end, and an outlet. The assembly also includes a cartridge receiver slidably receivable in the hollow interior of the barrel. The receiver includes an interior space for receiving the cartridge, an access needle extending into the interior space for puncturing the diaphragm of the cartridge. The access needle directs fluid to the barrel outlet. The cartridge receiver includes a plunger rod movable into the interior space of the cartridge receiver for engaging the piston of the cartridge to selectively force medicine in the cartridge through the access needle.

1 - 20 . (canceled) 
     
     
         21 . A syringe assembly comprising:
 a barrel having an interior wall, an exterior wall, a proximal end, a distal end, the interior wall, exterior wall, proximal end, and distal end defining an interior volume of the barrel, and an annular magnification element surrounding the exterior wall of the barrel;   a delivery needle extending distally from the distal end of the barrel; and   a plunger rod movable within the interior volume defined by the barrel to eject a liquid through the delivery needle.   
     
     
         22 . The syringe assembly of  claim 21 , further comprising a cartridge receiver within the interior volume of the barrel, the cartridge receiver including an interior for receiving a cartridge having a diaphragm and a piston. 
     
     
         23 . The syringe assembly of  claim 22 , further comprising an access needle having a proximal delivery point to penetrate the diaphragm of the cartridge, and a distal delivery point extending into a barrel outlet adaptor for dispensing the liquid. 
     
     
         24 . The syringe assembly of  claim 22 , wherein the plunger rod extends into an interior of the cartridge receiver for engagement with the piston of the cartridge. 
     
     
         25 . The syringe assembly of  claim 22 , wherein the cartridge receiver includes an opening for loading the cartridge into the interior of the cartridge receiver and a cover for selectively covering the opening to retain the cartridge in the interior space. 
     
     
         26 . The syringe assembly of  claim 22 , further comprising an access adapter within the cartridge for engaging the delivery needle. 
     
     
         27 . The syringe assembly of  claim 21 , wherein the plunger rod includes a thumb ring for manipulating the syringe assembly. 
     
     
         28 . The syringe assembly of  claim 21 , wherein the barrel further comprises a finger flange extending outward from the exterior wall of the barrel. 
     
     
         29 . The syringe assembly of  claim 28 , wherein the finger flange extends radially outward from the proximal end of the barrel. 
     
     
         30 . The syringe assembly of  claim 21 , wherein the annular magnification element is polished for magnifying the contents of the barrel. 
     
     
         31 . The syringe assembly of  claim 21 , wherein the annular magnification element is convex for magnifying the contents of the barrel. 
     
     
         32 . The syringe assembly of  claim 23 , further comprising a quick release coupling to engage or disengage the delivery needle to the barrel. 
     
     
         33 . The syringe assembly of  claim 21 , wherein the annular magnification element surrounds the barrel adjacent to the delivery needle for monitoring flashback flowing backward through the delivery needle. 
     
     
         34 . The syringe assembly of  claim 31 , wherein the convex annular magnification element surrounds the barrel adjacent to the cartridge and the diaphragm for monitoring flashback flowing backward through the delivery needle. 
     
     
         35 . The syringe assembly of  claim 21 , wherein the barrel is formed of a transparent material. 
     
     
         36 . The syringe assembly of  claim 22 , wherein the cartridge is formed of a transparent material. 
     
     
         37 . The syringe assembly of  claim 22 , wherein the diaphragm is formed of a transparent material. 
     
     
         38 . The syringe assembly of  claim 21 , wherein the annular magnification element is molded integrally with the barrel. 
     
     
         39 . The syringe assembly of  claim 22 , wherein the cartridge receiver further comprises an exterior having a plurality of spaced ribs for engaging the interior wall of the barrel. 
     
     
         40 . The syringe assembly of  claim 22 , wherein the piston is positioned at a proximal end of the cartridge. 
     
     
         41 . The syringe assembly of  claim 22 , wherein the diaphragm is positioned at a distal end of the cartridge. 
     
     
         42 . The syringe assembly of  claim 22 , wherein the cartridge receiver further comprises a cap for sealably engaging the interior wall of the barrel.