Yes, it is shooting you with a tiny bullet and sucking up the blood splash that results. The patent calls it a "micro-particle", 10µm to 250µm caliber. It can be "dart-shaped" or spherical. Muzzle velocity may be supersonic. The suggested material is gold particles held together with biodegradable glue, which is a neutral material for humans. Or maybe just a water droplet.

It seems they've tested this thing. On Google employees?