Patent ID: 8439891

Claim:
A method for starting an IV in a peripheral vein, which comprises providing a device having i) a first reservoir of a local anaesthetic and a second reservoir of a buffer, wherein said reservoir is disposed within a body of a syringe, said syringe with piston and barrel; ii) a hypodermic needle having a first outside diameter, a fluid receiving end and a needle tip; iii) a trocar having an inside diameter incrementally greater than said first outside diameter of said hypodermic needle, said trocar having a lancing tip; iv) a cannula having an inside diameter configured for slidably fitting over said trocar and detachably attaching to an adaptor on said barrel; wherein said hypodermic needle is coaxially nested inside said trocar with said needle tip projecting anteriorly therefrom and slidingly retractable therethrough, and said trocar is coaxially nested inside said cannula with said lancing tip projecting anteriorly therefrom and slidingly retractable therethrough; and, providing instructions to a) first mix said local anaesthetic and said buffer, thereby forming a buffered anaesthetic mixture; b) then insert said needle tip under the skin of a subject in need of an IV and, using said plunger, inject via said fluid receiving end a wheal of said buffered anaesthetic mixture thereunder; c) then slidingly retract said needle tip of said hypodermic needle into said trocar, thereby enclosing said needle tip; d) then insert said lancing tip of said trocar into a vein at an IV site selected on said subject in proximity to said wheal, said wheal for anesthetizing said IV site; e) detaching said cannula from said syringe and withdrawing said trocar from said vein, while leaving said cannula in place; and f) slidingly retracting said trocar into said body of said syringe, thereby enclosing said lancing tip.