A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
A61M5/142—Pressure infusion, e.g. using pumps
A61M5/14212—Pumping with an aspiration and an expulsion action