Adapter for human breast pumps
An air circuit is disclosed that communicates with a cycling, bi-directional or intermittent pressure source, splitting the output of the pressure source into two channels. One channel continues to cycle bi-directional or intermittent pressure, and a second channel employs a one-way valve allowing output of vacuum only. In one embodiment, this circuit can be used to actuate unidirectional, pulsating human breast milk expression devices that use vacuum to draw milk, while massaging the breast with pulsating pressure. The air circuit preferably includes an additional one-way valve, which is located upstream of the one-way negative pressure valve, for relief of excess positive pressure within the circuit. The negative channel output of the air circuit can contain a pressure regulation apparatus for end-user control of negative pressure to the expression devices.
1. An air circuit for a pump that produces bi-directional or intermittent negative air pressure and at least one express kit that requires either bi-directional or intermittent negative air pressure and unidirectional negative air pressure, the express kit having a breast cup, a liner in the breast cup and a milk collection device, the liner and breast cup forming a pulsation chamber that receives the air pressure, the liner and breast forming a vacuum chamber that receives the vacuum, the air circuit comprising:
an inlet for connection to the pump;
at least one first output providing from the inlet a bi-directional or intermittent negative air pressure output for the pulsation chamber; and
at least one second output producing from the inlet a unidirectional vacuum for the vacuum chamber.
2. The air circuit of claim 1 , comprising a one-way valve that converts the air pressure of the pump into the vacuum of the second output.
3. The air circuit of claim 1 , comprising a check valve that exhausts positive pressure from the inlet as needed.
4. The air circuit of claim 1 , comprising a vacuum control valve.
5. The air circuit of claim 1 , comprising a filter in the inlet, for preventing contamination.
6. The air circuit of claim 1 , comprising a filter in the second output.
7. The air circuit of claim 1 , comprising two express kits.