Nested blunt/sharp injection assembly

A medical injection device, comprising:

• a. a substantially hollow, sharp needle permanently attached to a needle hub;
• b. an adapter mounted on said needle hub for attaching said needle hub to a medication delivery system;
• c. a substantially rigid blunt cannula enclosing said needle and releasably attached to said needle hub at a first end, said blunt cannula tapering to a blunt opening at a second end opposite from said first end;
• d. a sharp vial access tip attached to said opening at said second end of said blunt cannula and;
• e. a sealing means for creating a seal between said sharp needle and said blunt cannula for drawing liquid simultaneously through both said sharp needle and said blunt cannula.

A method for accessing a liquid medicament contained in a vial sealed with an elastomeric stopper without the danger of creating a needle core, and subsequently administering the medicament, using an injection device which includes a substantially hollow, sharp needle permanently attached to a needle hub, an adapter mounted on said needle hub for attaching said needle hub to a syringe, a substantially rigid blunt cannula enclosing said needle and releasably attached to said needle hub at a first end using a sealing means for creating a liquid seal between the sharp needle and the blunt cannula, said blunt cannula tapering to a blunt opening at a second end opposite from said first end, and, a sharp vial access tip attached to said opening at said second end of said blunt cannula, the method comprising the steps of:

• a. attaching the injection device to a syringe using the adapter;
• b. inserting said sharp vial access tip and blunt cannula through the elastomeric stopper on the sealed vial;
• c. forcing fluid through said blunt cannula and sharp needle using said syringe as a part of the process of filling the syringe with the liquid injectant;
• and,
• d. withdrawing said blunt cannula from said vial, thus removing and leaving said vial access tip behind in said vial.

A method for accessing a liquid medicament contained in a vial sealed with an elastomeric stopper without the danger of creating a needle core, and subsequently administering the medicament, using an injection device which includes a substantially hollow, sharp needle permanently attached to a needle hub, an adapter mounted on the needle hub for attaching the needle hub to a syringe, a substantially rigid blunt cannula enclosing the needle and releasably attached to the needle hub at a first end using a sealing means for creating a liquid seal between the sharp needle and the blunt cannula, the blunt cannula tapering to a blunt opening at a second end opposite from the first end, and, a sharp vial access tip attached to the opening at the second end of the blunt cannula, the method comprising the steps of:

• a. attaching the injection device to a syringe using the adapter;
• b. inserting the sharp vial access tip and the blunt cannula through the elastomeric stopper on the sealed vial;
• c. forcing fluid through the blunt cannula and sharp needle using the syringe as a part of the process of filling the syringe with the liquid injectant;
• d. withdrawing the blunt cannula from the vial, thus removing and leaving the vial access tip behind in the vial;
• e. removing the blunt cannula from the needle hub, thereby exposing the sharp needle;
• and
• f. using the sharp needle to penetrate flesh whereby the injectant can be delivered.