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Intravenous catheter introducing device with a flashback member

  • US 20070088278A1
  • Filed: 07/17/2006
  • Published: 04/19/2007
  • Est. Priority Date: 07/26/2005
  • Status: Abandoned Application
First Claim
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1. An intravenous catheter introducing device comprising:

  • a needle cannula having a front segment terminating at a tip end, and a rear connecting segment opposite to said front segment;

    a flashback member having front and rear ends opposite to each other in a longitudinal direction, and a surrounding wall which interconnects said front and rear ends, said surrounding wall including a rear wall portion which is proximate to said rear end, and which cooperates with said rear end to define a flashback chamber with an accommodation space confined thereby, said flashback chamber being configured such that volume of said accommodation space is variable upon application of a manual force to said flashback chamber, and such that, by virtue of varying the volume of said accommodation space with the manual force acting on said flashback chamber, a reduced pressure is created in said accommodation space to place said flashback chamber in a ready position, where said tip end is permitted to search for a vein of a patient for taking a blood sample after said tip end has pierced into skin of the patient, while a first biasing force acting on said flashback chamber is generated as a result of a pressure difference between the reduced pressure and a pressure of an ambient atmosphere; and

    a front wall portion which is opposite to said rear wall portion in the longitudinal direction, and which is proximate to said front end, said front wall portion being associable with said rear connecting segment such that said flashback chamber is fluidly communicated with said needle cannula;

    a pressure counteracting member disposed to resist said first biasing force so as to permit said flashback chamber to be held in the ready position without the manual force once said tip end has pierced into the skin in search of the vein;

    a catheter hub which defines therein a duct that permits extension of said front segment of said needle cannula therethrough; and

    a tubular catheter having a proximate segment which is inserted into said duct, and a distal segment which extends from said proximate segment and which surrounds and sheathes said front segment of said needle cannula while permitting said tip end to project forwardly of said distal segment for piercing the skin.

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