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Dual-chamber syringe & method

  • US 5,496,284 A
  • Filed: 09/27/1994
  • Issued: 03/05/1996
  • Est. Priority Date: 09/27/1994
  • Status: Expired due to Term
First Claim
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1. A medical syringe, includinga plunger having at one end a resilient seal,a barrel having a central longitudinal axis and a pair of opposed ends,said barrel having at one end an ejection port and at the other end an opening, said ejection port and opening being aligned with each other and disposed along the longitudinal axis,outer and inner telescopic tubular elements seated inside the barrel to be coaxial with said longitudinal axis,the outer tubular element being mounted in a stationary position while disposed in the barrel and the inner tubular element being movable axially within the outer tubular element,said outer tubular element and barrel forming a chamber holding a reservoir of liquid, with the outer tubular element having a fluid passageway therein that allows the liquid to flow from the chamber into the inner tubular element, andthe inner tubular element having an end nearby the injection port with a seal thereon that has an orifice therein, said inner tubular element receiving the end of the plunger with the resilient seal thereon,said resilient seal fitting snug within the inner tubular element to grip said inner tubular element and, in response to axial movement of the plunger, to move the inner tubular element between a first position where said seal with the orifice therein seals the injection port as the plunger is moved towards said injection port, preventing liquid in the chamber from passing into the inner tubular element and forcing any liquid in the inner tubular element through the orifice and out the injection port, and a second position where said seal with the orifice therein is moved to a retracted position away from the injection port, allowing liquid to flow from the chamber through the passageway and through the orifice into the inner tubular member.

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