Abstract: A device and technique utilized in body fluid aspiration which minimizes the risk of complications that normally may result from accidental puncture of internal organs. The device includes a sharp-tipped fluid aspiration needle which features cushioning means, preferably in the form of an inflatable balloon, positionable between the sharp tip of the needle and the internal organs during the aspiration procedure. The inflatable balloon is preferably connected to an end of a cannula which is, in turn, slidably positionable within the hollow needle. The cannula is in a retracted position in the needle upon insertion of the latter through the body. When the fluid is located, the cannula is advanced to a locked position beyond the sharp tip of the needle, whereupon the balloon is inflated and the fluid aspiration commenced. The inflated balloon and extended cannula ablate the sharp edge of the needle as well as minimize movement thereof during the procedure to substantially reduce the risk of accidental puncture.

Abstract: A method and apparatus for reducing the risk of contamination of individuals who handle a blood sampling needle and syringe subsequent to the taking of the sample. The apparatus includes a substantially tubular needle guard having an open end and a closed end and adapted to be fitted about the needle of the blood sampling syringe. A fluid impervious stopper or seal is affixed to the inner wall of the needle guard at a position intermediate its ends. The enclosed chamber between the seal and the closed end of the needle guard has been evacuated to a subatmospheric pressure. After the blood sample has been drawn, the user places the needle guard about the needle in such a fashion that the tip of the needle penetrates the seal so as to be enclosed within the vacuum chamber. A small amount of air or an air and blood mixture will then be drawn into the vacuum chamber from the syringe, and the entire unit may be thereaffter safely handled.