Flow control valve assembly for syringes

  • US 5,045,055 A
  • Filed: 06/07/1990
  • Issued: 09/03/1991
  • Est. Priority Date: 10/21/1988
  • Status: Expired due to Fees
First Claim
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1. In a syringe having a flow control nozzle mounted on a proximal end of a handle and communicating through a bore in the handle with a source of fluid connected to a distal end of the handle, and flow control valve means mounted in the bore for controlling flow of the fluid to the nozzle, the improvement wherein the flow control valve means includes a tubular valve body for insertion in the bore and having an end wall with an axial port and at least one lateral port adjacent said end wall, a cavity in said valve body providing fluid communication between said ports, a valve stem mounted in said valve body cavity for axial motion relative to said axial port, said valve stem having a head extending through said axial port with an annular groove adjacent said end wall, an 0-ring removably mounted in said groove and axially movable with said head for seated engagement with said end wall around said axial port, biasing means in said cavity operatively connected between said stem and said valve body for biasing said 0-ring into said seated engagement, and finger operable means on said stem for displacing said 0-ring out of said seated engagement to afford fluid flow through said ports, said 0-ring cooperating with said end wall to provide the sole means for maintaining said stem operatively assembled with said valve body.

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