Patent ID: 8690550

Claim:
A valveless membrane micropump, comprising: a substrate; a vibration membrane disposed corresponding to the substrate and having a vibrating portion; a vibration chamber, formed between the vibrating portion and the substrate, comprising at least one chamber inlet and at least one chamber outlet; at least one flow guide, situated between the vibrating portion and the substrate, extending in a direction perpendicular to the substrate and adjacent to the vibration chamber, guiding a fluid within the vibration chamber to flow in order to provide a positive net flow rate toward the at least one chamber outlet; at least one fluid inlet; at least one fluid outlet; at least one inlet rectifier connecting the at least one chamber inlet to the at least one fluid inlet; at least one outlet rectifier connecting the at least one chamber outlet to the at least one fluid outlet; and an actuator connected to the vibration membrane to reciprocate the vibrating portion, enabling the fluid to flow into the vibration chamber via the at least one fluid inlet and flow out of the vibration chamber via the at least one fluid outlet, wherein when viewed in a direction of oscillation perpendicular to a plane of the vibration membrane, the actuator extends over and overlaps the vibration chamber and the at least one flow guide.