Flashback chamber for catheter
First Claim
1. An improved flashback structure for a catheter, said structure comprising;
- a main body portion including wall means defining a cavity;
a member slidably engaged on said main body portion;
means, within said cavity, defining a small cross sectional area blood path, said means defining said blood path comprising septum means defining a chamber maze within said body, an elongate hollow needle including a major forwardly extending length exteriorly of said main body portion;
means securing said hollow needle to said main body portion, said needle terminating at a sharpened distal end, and including a minor rearwardly extending length secured within said main body portion;
said hollow needle being in open communication with the interior of said flashback chamber structure cavity, whereby a fluid, such as blood, will flow through said hollow needle from said sharpened end, and into filling relation of said blood path, and said body portion including vent means to vent the blood path.
1 Assignment
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Accused Products
Abstract
A plastic catheter is disclosed with an improved flashback chamber defining structure which structure includes (a) a main body portion providing a chamber maze for an interconnection between respective maze portions to insure a sequential filling of each portion with blood for visual observation of the flow of blood; (b) a top slidable transversely fluted cover is engaged in sealing relation of the main body portion by track defining structure defined by the main body portion for advancement of the plastic catheter in a patient'"'"'s vein or artery, the cover being preferably of a transparent material to permit easy visual observation of the blood flow into the maze; and the catheter also includes a hollow needle secured to the leading end of the main body portion, the needly having flattened or oval portion captivatingly disposed in a cavity in the leading end; the cover having exterior flutes on the main body portion providing for non-slip advancement of the catheter relative to the needle, when the needle tip is in a proper location in a patient'"'"'s vein or artery; and a positive stop is provided on the cover portion to prevent the exposure of any portion of the maze during the manipulation of the catheter; so that the overall disclosed structure results in coaxial alignment of the various parts while the catheter is being advanced.
87 Citations
17 Claims
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1. An improved flashback structure for a catheter, said structure comprising;
- a main body portion including wall means defining a cavity;
a member slidably engaged on said main body portion;
means, within said cavity, defining a small cross sectional area blood path, said means defining said blood path comprising septum means defining a chamber maze within said body, an elongate hollow needle including a major forwardly extending length exteriorly of said main body portion;
means securing said hollow needle to said main body portion, said needle terminating at a sharpened distal end, and including a minor rearwardly extending length secured within said main body portion;
said hollow needle being in open communication with the interior of said flashback chamber structure cavity, whereby a fluid, such as blood, will flow through said hollow needle from said sharpened end, and into filling relation of said blood path, and said body portion including vent means to vent the blood path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- a main body portion including wall means defining a cavity;
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17. An improved flashback structure for a catheter, said structure comprising;
- a main body portion including wall means defining a cavity;
a member slidably engaged on said main body portion;
means, within said cavity, defining a small cross sectional area blood path, said means defining said blood path comprising septum means defining a chamber maze within said body, an elongate hollow needle including a major forwardly extending length exteriorly of said main body portion;
means securing said hollow needle to said main body portion, said needle terminating at a sharpened distal end, and including a minor rearwardly extending length secured within said main body portion;
said hollow needle being in open communication with the interior of said flashback chamber structure cavity, whereby a fluid, such as blood, will flow through said hollow needle from said sharpened end, and into filling relation of said blood path, and said body portion including vent means to vent the blood path, said body portion and said member including a pair of opposed mating side edge portions for sliding and sealing engagement defining mating longitudinal guide means for said slidable member.
- a main body portion including wall means defining a cavity;
Specification