Retractable-needle cannula insertion set

摘要

An introducer needle assembly comprises: a hollow needle having a proximal end and a sharp distal end; a hollow handle having a proximal end and a distal end; a needle hub connected to the proximal end of the hollow needle and slidably disposed in the hollow handle; a spring operably connected to the needle hub; a latch operably engaging the needle hub selectively to maintain the needle hub adjacent to the distal end of the hollow handle against the bias of the spring; and flashback chamber fixedly connected to the hollow handle so the needle and the needle hub are movable with respect to the flashback chamber and the flashback chamber is in fluid communication with the hollow needle for receiving blood from within the hollow needle and wherein the flashback chamber does not move with respect to the hollow handle when the needle hub is moved proximally in the hollow handle. <IMAGE>