Non-coring fill needle
A non-coring needle that includes a sharpened and hardened tip having a tapered back region against which a length of tubing is pressed and welded, brazed or soldered. A Luer Lock hub may be attached to the other end of the tubing.
1. A non-coring needle which comprises:
a metal tip that has a front portion and a back portion, said front portion being tapered toward a sharpened end and said back portion having a reverse taper;
a length of metallic tubing abutting said reverse tapered back portion, said tubing and said reverse tapered back portion of said tip being joined by welding, brazing or soldering; and
a cross-hole through at least one wall of said tubing near the said tip.
2. A non-coring needle as recited in claim 1 where said tip is cylindrical and the maximum outside diameter of said tip is larger than the outside diameter of said tubing.
3. A non-coring needle as recited in claim 2 wherein said length of tubing has a central axis and the outer diameter of said weld, braze or solder is less than the outer diameter of said tip.
4. A non-coring needle as recited in claim 1 wherein said cross-hole passes through both sides of said tubing.
5. A non-coring needle as recited in claim 1 and further including a hub attached to said tubing at the end opposite said tip.
6. A non-coring needle as recited in claim 4 where said hub is of the Luer-Lock type.
7. A non-coring needle as recited in claim 1 where said tip has been hardened.
8. A non-coring needle as recited in claim 1 wherein said welding is accomplished without filler.