A backflow protector in a breast pump functions as a barrier, typically featuring a flexible silicone diaphragm, designed to separate the milk collection kit from the pump motor. This component is engineered to remain completely dry during use, which dictates the cleaning protocols. Unlike other pump parts that contact milk, backflow protectors should not be washed or submerged in water.
The Purpose of Backflow Protectors
Backflow protectors are a defining feature of a “closed system” breast pump, ensuring the air pathway remains isolated from the milk collection system. This isolation is achieved through the diaphragm, which seals the tubing and prevents milk, condensation, or water vapor from flowing backward toward the motor. The protector allows air pressure changes to travel to the flange without liquid contact.
Maintaining this physical separation is important for both hygiene and the longevity of the pumping unit. The barrier function prevents the motor from becoming a collection point for moisture or contaminants.
Handling and Inspecting the Protector Components
Users should focus on inspecting and handling the backflow protector, as washing is strictly contraindicated. The parts that require regular washing include flanges, bottles, and valves, which have direct milk contact. After each pumping session, gently disassemble the protector to check the internal components for any signs of moisture or milk residue.
If condensation is visible on the silicone diaphragm or the plastic housing, the pieces must be laid out separately on a clean surface to air-dry completely. The exterior of the housing can be wiped with a clean, dry cloth if needed, but the parts should never be rinsed or submerged. Complete dryness is required before reassembling the unit or storing it.
If milk has accidentally entered the backflow protector, cleaning it is usually ineffective and may damage the delicate silicone. Manufacturers strongly recommend replacing the backflow protector entirely. Replacement ensures the barrier integrity is maintained and prevents the spread of contaminants into the air pathway.
The Dangers of Moisture and Contamination
Ignoring the instruction to keep the backflow protector dry introduces two risks related to hygiene and equipment. When moisture or residual milk becomes trapped inside the protector or the tubing, it creates an optimal environment for microbial proliferation. This damp, dark space allows for the growth of mold or bacteria.
These contaminants can then be aerosolized by the pump’s air flow and drawn into the milk collection system. If liquid breaches the protector and travels through the tubing, it can directly compromise the pump motor. Moisture within the motor can lead to internal corrosion or electrical shorting, diminishing the pump’s performance and leading to permanent equipment failure.