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Medical device with sterile fluid pathway

  • US 5,395,339 A
  • Filed: 01/31/1992
  • Issued: 03/07/1995
  • Est. Priority Date: 01/31/1992
  • Status: Expired due to Term
First Claim
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1. A medical device comprising:

  • an elongate and tubular syringe barrel having interior and exterior surfaces and distal and proximal ends, the interior surface having a radially inwardly extending member positioned adjacent its proximal end;

    piston means disposed in said body member for controlling the flow of fluid into and out of said body member, said piston means being movable from a first position blocking the flow of fluid into and out of said body member to a second position allowing the flow of fluid into and out of said body member;

    a plunger rod having distal and proximal ends wherein said distal end is operatively connected to said piston means and said proximal end is disposed to extend proximally from said proximal end of said body member, said plunger rod being movable with said piston means, the plunger rod having a radially extending flexible disc member thereon such that said radially inwardly extending lip member of the syringe barrel is sealingly engaged by said flexible disc member to form a proximal barrier when said piston means is in said first position to prevent the contamination of said interior surface of said syringe barrel through the proximal end of said syringe barrel.

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