Replacement Battery for Air Mattress (Evergreen OpalAir)

Why Pump Power Continuity Is a Clinical Requirement, Not a Convenience Feature, in Pressure Injury Management

Alternating pressure and low air loss mattress systems operate on the principle that continuous redistribution of pressure across the patient’s body surface prevents the sustained tissue compression that initiates pressure injury. The therapeutic mechanism is not passive — it requires the pump to actively cycle air between cells on a defined timing interval, typically cycling the full mattress surface every five to ten minutes. When the pump stops — for any reason, including a power interruption — the cells that are currently deflated remain deflated and the cells that are currently inflated remain inflated, and the patient’s weight is redistributed onto the static inflated cell pattern within minutes of pump stoppage. For a patient on an alternating pressure surface because of high pressure injury risk or because of existing tissue damage, the transition from a cycling surface to a static pressure pattern is not a temporary inconvenience — it is a reversion to the tissue loading condition the therapeutic surface was prescribed to prevent. Clinical guidance on pressure injury prevention identifies sustained pressure at the same anatomical points as the primary tissue damage mechanism, and the value of the alternating pressure surface is entirely contingent on the pump maintaining its cycle. Backup battery capacity is therefore a patient safety specification for the OpalAir system in any environment where mains power reliability cannot be guaranteed.

The specific vulnerability of the OpalAir system to power interruption is amplified by the patient population for whom it is typically prescribed. Alternating pressure mattresses are prescribed for patients at Stage 3 or Stage 4 risk on pressure injury assessment scales — patients who are largely immobile, cannot reposition independently, and often have compromised tissue perfusion from diabetes, peripheral vascular disease, or reduced cardiac output. For this population, the window between pump stoppage and the onset of tissue ischemia at high-pressure anatomical points — the sacrum, heels, trochanters, and occiput — is shorter than for a healthy, mobile individual. Research on tissue tolerance identifies significant pressure ischemia beginning within one to two hours of sustained loading in high-risk patients, which is well within the duration of a typical power outage event. The backup battery’s function is to bridge this window — maintaining the pump’s cycle during the power interruption and preventing the transition to static loading that could initiate tissue damage before power is restored.

Battery capacity degradation is the failure mode that makes replacement of this component a scheduled maintenance requirement rather than a reactive one. Lead-acid and lithium battery chemistries both lose capacity through charge-discharge cycling over their service life — a battery that provides the rated backup duration when new may provide only sixty or seventy percent of that duration after two years of normal standby use, and the capacity reduction accelerates as the battery ages. The critical characteristic of battery capacity degradation is that it is invisible during normal operation: the pump runs on mains power under normal conditions, and the battery remains in a charged standby state. The battery’s degraded capacity is not apparent until the first power interruption occurs and the battery’s actual remaining capacity determines whether the pump continues through the outage or stops before power is restored. In a long-term care facility with a high-risk patient population, a battery that fails during its first real outage because its capacity had degraded below functional threshold is an avoidable patient safety event. Proactive battery replacement on a defined interval — typically every two to three years depending on the battery chemistry and the facility’s power interruption history — prevents this silent degradation from becoming a therapy failure event.

The patient transport scenario is the second major battery use case that distinguishes the OpalAir battery as a clinical tool rather than a convenience accessory. Patients on therapeutic air surfaces in long-term care or acute settings are sometimes transported within the facility — between rooms, to diagnostic imaging, or to a procedure suite — while remaining on the mattress. These transport periods disconnect the pump from mains power for the duration of the move, and for a high-risk patient who cannot be repositioned during transport, the pump must continue cycling to prevent the static loading that the transport’s duration would otherwise impose. The backup battery capacity available during transport must be sufficient to cover the transport duration plus a return-to-room period — a total disconnection time that may range from thirty minutes to several hours depending on the facility’s layout and the procedure’s duration. A battery whose capacity has degraded to below the transport duration threshold prevents the patient from being transported on the therapeutic surface, forcing a decision between delaying the procedure and moving the patient to a standard surface — neither of which is the intended clinical workflow for a patient at active pressure injury risk.

Key Features

• Replacement backup battery module for the Evergreen OpalAir alternating pressure / low air loss pump unit — the power source that maintains pump cycling during mains power interruptions and patient transport
• Designed specifically for the OpalAir system — correct voltage, capacity, and connector specification for the OpalAir pump’s power interface
• Maintains alternating pressure cell cycling during backup operation — the pump continues on its defined cycle interval without interruption or cycle shortening during battery-powered operation
• Supports patient transport on the therapeutic surface — provides the disconnected-from-mains runtime needed for within-facility transport without static pressure loading
• Replacement addresses battery capacity degradation — the scheduled maintenance component that prevents silent capacity loss from producing a therapy failure event during the first real power interruption
• Easy replacement when original battery has lost capacity — installed by facility biomedical staff or qualified homecare provider without pump unit return

Benefits

• Prevents the transition from alternating to static pressure loading during power interruptions — the clinical consequence that makes backup battery capacity a patient safety specification for high-risk patients
• Maintains therapy continuity for the high-risk patient population for whom tissue ischemia can begin within one to two hours of sustained loading at high-pressure anatomical points
• Enables within-facility patient transport on the therapeutic surface without mains power — avoiding the clinical workflow disruption of moving the patient to a standard surface for procedures
• Proactive replacement on a defined interval prevents the silent capacity degradation failure mode — identifying the battery’s functional threshold before the first real outage reveals it
• Extends the service life of the OpalAir pump unit by providing a correctly specified replacement battery rather than attempting operation with a degraded original battery

Typical Applications

✓ Power outage backup — OpalAir pump units in homecare or long-term care environments where mains power interruptions occur, for patients at Stage 3 or 4 pressure injury risk for whom pump stoppage is a patient safety event ✓ Scheduled proactive replacement — battery replacement at the manufacturer-recommended service interval (typically two to three years) before capacity degradation reduces backup duration below the functional threshold ✓ Capacity-fail replacement — battery replacement after an outage event in which the battery did not sustain pump operation for the expected duration, confirming capacity has degraded below specification ✓ Within-facility patient transport — battery condition confirmation and replacement before transporting a high-risk patient on the OpalAir surface within the facility for a procedure or diagnostic imaging ✓ Homecare equipment commissioning — battery inspection and replacement when an OpalAir system is transferred to a new homecare patient, confirming backup capacity before the system enters service ✓ Long-term care facility preventive maintenance program — battery replacement included in the facility’s scheduled therapeutic surface service protocol, with replacement dates tracked per pump unit