Flash chamber
First Claim
Patent Images
1. A flash chamber designed for carrying a hollow tubular needle for making the puncture site, carrying coaxially therewith a catheter into a human blood vessel and receiving the spurt of blood which passes through the needle and into the flashback chamber, comprising;
- a needle hub being a hollow tubular structure opened at both ends and so configured to hold the needle at one open end thereof in fluid communication permitting flow of fluid therethrough to the other end of said hub;
a cap being a hollow elongated tubular component open at one end and closed at its other and along the inside of said cap recesses defined by spaced longitudinal ribs forming longitudinal channel-like passages between the outside of said hub structure and the inside of said cap and said cap being sized to fit over said other end of said needle hub and extend therefrom so that the open end of said cap interengages with the outer surface of said needle hub near its end most distal and is held thereto by conjugation therewith; and
axial holding means positioned on said needle hub and designed for cooperative engagement with said cap ribs to provide a predetermined position of interengagement therebetween and for forming a tortuous path first through said hollow hub and then between said hub and said cap toward the needle end of said hub to inhibit the fluid flow therethrough and transversely over said axial holding means.
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Accused Products
Abstract
A flash chamber formed of two molded components being a cap which fits over a hollow hub and conjugates therewith to form a tortuous path through the hub and then between the outside of the hub and the inside of the cap.
82 Citations
9 Claims
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1. A flash chamber designed for carrying a hollow tubular needle for making the puncture site, carrying coaxially therewith a catheter into a human blood vessel and receiving the spurt of blood which passes through the needle and into the flashback chamber, comprising;
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a needle hub being a hollow tubular structure opened at both ends and so configured to hold the needle at one open end thereof in fluid communication permitting flow of fluid therethrough to the other end of said hub; a cap being a hollow elongated tubular component open at one end and closed at its other and along the inside of said cap recesses defined by spaced longitudinal ribs forming longitudinal channel-like passages between the outside of said hub structure and the inside of said cap and said cap being sized to fit over said other end of said needle hub and extend therefrom so that the open end of said cap interengages with the outer surface of said needle hub near its end most distal and is held thereto by conjugation therewith; and axial holding means positioned on said needle hub and designed for cooperative engagement with said cap ribs to provide a predetermined position of interengagement therebetween and for forming a tortuous path first through said hollow hub and then between said hub and said cap toward the needle end of said hub to inhibit the fluid flow therethrough and transversely over said axial holding means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A flash chamber for a needle and catheter combination comprising;
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a first member generally tubular and having at one end an inside opening for receiving a needle and said opening extending to an internal surface forming a first chamber open outwardly thereof at the other end of said first member, and a second member fashioned from a transparent material to fit over and enclose the end of said first member opposite said needle extending thereover and thereabout to interengage with the outer surface of said first member near the area of said needle to define a second chamber between the outside surface of said first member and the inside surface of said second member to provide a tortuous path through said first and second chambers said second member including a lens defined by the difference in curvature of the outside of said cap and the inside tubular surface.
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Specification