US Patent 10183102 Hands-free breast pump

A hands-free breast pump comprises a funnel-shaped adsorption unit having an adsorption surface and a suction tank; a suction chamber having an extension part, the extension part having a connection pipe and a second suction hole formed on the lower portion of the inner peripheral surface, and a first coupling part extended downwardly from the extension part and having a third suction hole formed on the lower portion of the inner peripheral surface thereof; and a storage vessel coupled to the first coupling part in the horizontal direction with the adsorption surface to store the breast milk discharged from the backflow prevention unit therein.