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Self-sticking needle assembly and method for insertion into an artery

Image Number 3 for United States Patent #5425718.

The needle assembly of the present invention includes a rigid cannula with a blunt distal end, a needle housed inside the cannula, a hub on the needle for controlling the position of the distal end of the needle with respect to the distal end of the cannula and a stop connected to the cannula for limiting the distance of travel of the distal end of the needle. The preferred embodiment may also include a spring attached to the needle hub. The present invention also encompasses methods of using the needle assembly.

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