초록 ▼

An electric breast pump utilizes an electric motor to drive a piston vacuum pump to draw a negative pressure or suction up to 250 mm Hg at a flexible collapsible breast cup. The suction cycles between the set maximum and atmospheric under the control of a magnetic valve that is opened and closed by

An electric breast pump utilizes an electric motor to drive a piston vacuum pump to draw a negative pressure or suction up to 250 mm Hg at a flexible collapsible breast cup. The suction cycles between the set maximum and atmospheric under the control of a magnetic valve that is opened and closed by a vacuum sensor. The valve opens and closes a bypass to atmosphere. The speed of the electric motor can be selectively varied to increase the frequency of the suction cycles, which can vary between 20 to 44 cycles per minute. The breast cup collapses during a part of each cycle to simulate the peristaltic action of a suckling infant.

대표청구항 ▼

1. A breast pump for extracting breast milk from a human teat, comprising:a motor; a vacuum pump driven by said motor; a flexible plastic breast cup connected to the vacuum pump by a tube; a bypass valve for venting the suction created in the breast cup to atmosphere; and a vacuum sensor for sensing

1. A breast pump for extracting breast milk from a human teat, comprising:a motor; a vacuum pump driven by said motor; a flexible plastic breast cup connected to the vacuum pump by a tube; a bypass valve for venting the suction created in the breast cup to atmosphere; and a vacuum sensor for sensing the suction in the breast cup and opening the bypass valve when maximum suction is sensed, and closing the bypass valve when the suction is released.