One step catheter advancement automatic needle retraction system
First Claim
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1. A catheter and needle introducer assembly, comprising:
- a barrel defining a barrel lumen and having a proximal end and a distal end with an opening therein;
a catheter having a proximal end and a distal end;
a catheter hub affixed to the proximal end of the catheter;
a needle disposed in the catheter and having a sharp distal tip and a proximal end;
a needle hub affixed to the proximal end of the needle and disposed in the barrel lumen;
at least one flexible arm affixed to the needle hub such that in a first position the flexible arm engages the barrel and the sharp distal tip of the needle extends distally of the distal end of the barrel through the opening coaxially within the catheter;
a spring having a proximal end and a distal end, the spring engaging the barrel and the needle hub to urge the needle hub toward the proximal end of the barrel; and
a chamber separate from and movable with respect to the needle hub and the barrel disposed inside the distal portion of the needle hub and coaxially about the needle, the chamber having a proximal portion and a distal portion with the proximal portion having a smaller outer diameter than the distal portion so in the first position the distal portion is adjacent to the flexible arm to urge the flexible arm into engagement with the barrel and in a second position the proximal portion is adjacent to the flexible arm and allows the flexible arm to move out of engagement with the barrel.
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Abstract
The one step catheter advancement automatic needle retraction system of this invention includes a generally hollow barrel, a needle hub which can include a flashback chamber disposed in the barrel, a secondary flashback chamber disposed in the barrel, a biasing mechanism for retracting the needle into the barrel and a clip associated with the secondary flashback chamber for engaging a catheter hub. The needle hub in conjunction with the secondary flashback chamber retain the needle in the extended position against the force of the biasing mechanism until the catheter has been advanced a certain distance from the distal end of the barrel.
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Citations
12 Claims
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1. A catheter and needle introducer assembly, comprising:
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a barrel defining a barrel lumen and having a proximal end and a distal end with an opening therein; a catheter having a proximal end and a distal end; a catheter hub affixed to the proximal end of the catheter; a needle disposed in the catheter and having a sharp distal tip and a proximal end; a needle hub affixed to the proximal end of the needle and disposed in the barrel lumen; at least one flexible arm affixed to the needle hub such that in a first position the flexible arm engages the barrel and the sharp distal tip of the needle extends distally of the distal end of the barrel through the opening coaxially within the catheter; a spring having a proximal end and a distal end, the spring engaging the barrel and the needle hub to urge the needle hub toward the proximal end of the barrel; and a chamber separate from and movable with respect to the needle hub and the barrel disposed inside the distal portion of the needle hub and coaxially about the needle, the chamber having a proximal portion and a distal portion with the proximal portion having a smaller outer diameter than the distal portion so in the first position the distal portion is adjacent to the flexible arm to urge the flexible arm into engagement with the barrel and in a second position the proximal portion is adjacent to the flexible arm and allows the flexible arm to move out of engagement with the barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A catheter and needle introducer assembly, comprising:
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a barrel defining a barrel lumen and having a proximal end and a distal end with an opening therein; a catheter having a proximal end and a distal end; a catheter hub affixed to the proximal end of the catheter; a needle disposed in the catheter and having a sharp distal tip and a proximal end; a needle hub defining a flashback chamber affixed to the proximal end of the needle; a means engaging the barrel and the needle hub for biasing the needle hub toward the proximal end of the barrel; a means for retaining the needle hub adjacent to the distal end of the barrel; and a means for allowing the means for biasing to force the needle hub toward the proximal end of the barrel.
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12. A catheter and needle introducer assembly, comprising:
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a catheter having a proximal end and a distal end; a catheter hub affixed to the proximal end of the catheter; a needle disposed in the catheter and having a sharp distal tip and a proximal end; a needle hub affixed to the proximal end of the needle; a needle shield disposed between the needle hub and the catheter hub; and a clip operatively connected to the needle shield and engaging the catheter hub.
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Specification