Alternating Pressure & Low Air Loss Mattress Systems

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Alternating Pressure Mattresses

Alternating Pressure, Low Air Loss and Lateral Rotation Support Surfaces

An alternating pressure mattress uses a pump to inflate and deflate air cells in a repeating cycle, so the points of the body bearing load change every few minutes rather than staying loaded continuously. That cyclical offloading is the mechanism, and it is fundamentally different from a static foam surface that simply spreads pressure more evenly.

Pressure injuries develop where tissue is compressed against bone for long enough to compromise perfusion. A patient who cannot reposition themselves keeps loading the same sacrum, the same heels, the same trochanters, hour after hour. A static surface lowers the peak pressure at those points. A powered alternating surface removes the load from them entirely on a cycle, which is a different order of intervention.

This collection carries 126 systems spanning overlays, full replacement mattresses, bariatric widths, low air loss configurations and lateral rotation systems, from Proactive Medical's Protekt Aire line, Drive DeVilbiss Med-Aire, Lumex Select, Wellell, Joerns and Dynarex.

→ Part of Mattresses & Support Surfaces. Also see Hospital Beds, Bariatric Beds, Bed Accessories, Positioning Wedges & Bolsters.

Overlay or Replacement System?

An overlay sits on top of an existing mattress. A replacement system takes the place of the mattress entirely. The choice affects therapeutic depth, bed height and rail geometry, and it is worth thinking through before ordering rather than after.

Overlays

Lower cost, quick to deploy, and reversible when the patient's needs change. The trade-off is depth: an overlay adds height to the bed, which reduces the effective height of your side rails and can create a rail gap that was not there before. It is also a shallower air column, so it offers less immersion for a heavier patient. Options here include the Drive 14003 Med-Aire overlay, the Dynarex 10440 DynaRest pump and pad system, and the Wellell Domus 1 bubble pad system.

Replacement systems

Deeper air columns, better immersion, no change to bed height and no new rail gap. This is the standard for anything beyond low-risk prevention. Depth matters: the Joerns Dermafloat LAL runs 10 inches deep at 500 lb SWL, which gives a heavier patient somewhere to sink to before bottoming out on the deck.

Alternating Pressure vs Low Air Loss: They Solve Different Problems

Alternating pressure cycles load off different areas of the body. Low air loss moves air across the skin surface to manage moisture and heat. These are separate mechanisms addressing separate risk factors, which is why many systems combine both.

Technology	Mechanism	Addresses
Alternating pressure	Air cells inflate and deflate on a cycle	Sustained load on bony prominences
Low air loss	Air flows through the surface across the skin	Moisture and heat at the skin interface
Lateral rotation	Surface turns the patient side to side	Patients who cannot be manually turned
Static pressure redistribution	Foam or gel spreads load over more area	Lower peak pressure for lower-risk patients

Microclimate, meaning moisture and temperature at the skin, is an independent risk factor. Skin that stays damp macerates and becomes far more vulnerable to the same pressure that intact dry skin would tolerate. If your patient is incontinent, diaphoretic or on a surface that traps heat, low air loss is addressing something alternating pressure alone will not.

Combined systems in this collection include the Lumex Select line: LS200, LS300, LS400 and LS900 AeroComfort, plus the Protekt Aire 80040DX and Wellell's ProCare Elite and Serene Air.

Lateral rotation

For patients who cannot be manually turned, or where turning requires more staff than are available, lateral rotation surfaces do the turning. The Drive LS9525 MasonAir turn-style and PreserveTech lateral rotation with on-demand low air loss cover this. Rotation is a clinical decision with its own contraindications, so it belongs in a care plan rather than as a general upgrade.

Bariatric Alternating Pressure Systems

Bariatric systems differ in three ways: wider surfaces to match bariatric bed decks, higher weight ratings, and pumps sized to fill a larger air volume without losing cycle timing. A standard pump on an oversized surface produces a cycle that is too slow to be therapeutic.

Drive's Med-Aire Plus bariatric replacement systems come in several widths at 80 inch length: the 14030, 14048, 14054 and 14060. A mattress-only version of the 14030 is available where you already have a compatible pump.

Also here: the Joerns Arise 1000 and 1000EX bariatric low air loss systems and the Wellell Domus Auto G2 bariatric system.

Compare Support Surface Options

System	Type	Notable Specification
Drive 14027M Med-Aire	Alternating pressure replacement	8 H x 36 W x 80 L inch
Drive 14029DP Med-Aire Plus	Alternating pressure replacement	8 inch depth, Plus series
Drive 14027 Med-Aire LAL	Alternating pressure plus low air loss	8 inch alternating pressure with LAL
Drive 4580P Perimeter Plus	Alternating pressure with defined perimeter	36 W x 80 L inch, firm edge
Drive BA9600-P Balanced Aire	Alternating pressure	7 H x 36 W x 80 L; 42 inch version available
Drive 14360-P Med-Aire Edge	Alternating pressure replacement	PreserveTech edge construction
Joerns Dermafloat LAL	Low air loss	10 inch depth, 500 lb SWL
Lumex LS900 AeroComfort	Alternating pressure plus low air loss	Top of the Lumex Select range
Wellell PD08503 Optima Auto	Alternating pressure	36 inch with battery backup
Wellell PD15501 Domus Auto G2	Alternating pressure	36 inch, quilted cover, 450 lb capacity
Drive LS9525 MasonAir	Lateral rotation	Turn-style rotation, 80 inch length
Wellell PP02101 Domus 2S	Heel-specific overlay	Targeted heel pressure relief

Frequently Asked Questions

How does an alternating pressure mattress work?

A pump inflates and deflates rows of air cells on a repeating cycle, typically over several minutes, so the areas of the body bearing load change continuously. Tissue that was compressed against bone during one phase is offloaded during the next, which allows perfusion to return before ischemic damage develops. This is different from a static foam surface, which lowers peak pressure but never removes load from a given point.

What is the difference between alternating pressure and low air loss?

They address different risk factors. Alternating pressure cycles load off bony prominences. Low air loss moves air across the skin surface to manage moisture and heat, known collectively as microclimate. Damp, warm skin macerates and tolerates far less pressure than dry skin, so a patient who is incontinent or diaphoretic has a problem that alternating pressure alone does not solve. Many systems combine both technologies for that reason.

Should I choose an overlay or a replacement mattress?

Overlays cost less, deploy quickly and are reversible, but they add height to the bed, which reduces effective side rail height and can create a rail gap. They also provide a shallower air column and less immersion. Replacement systems give deeper air columns and better immersion without changing bed height or rail geometry. For anything beyond low-risk prevention, a replacement system is generally the appropriate specification.

Which support surface is right for a patient with an existing pressure injury?

Support surface selection for an existing pressure injury should follow a clinical assessment by the treating team, using a validated risk assessment tool and taking account of injury stage, location, patient mobility, moisture and nutritional status. As a general pattern, higher risk and existing injury point toward powered systems with deeper air columns and, where microclimate is a factor, low air loss. This is a care plan decision rather than a catalogue decision, and the surface is one part of a broader prevention protocol that also includes repositioning, skin inspection and nutrition.

Does an alternating pressure mattress replace repositioning?

No. Powered support surfaces reduce risk; they do not eliminate the need for a repositioning schedule, regular skin inspection and the rest of the prevention protocol. Treating a mattress as a substitute for turning is a common and consequential error. Follow your facility's protocol and the treating clinician's plan.

What is lateral rotation and when is it used?

A lateral rotation surface turns the patient side to side mechanically, used where the patient cannot be manually turned or where turning would require more staff than are available. It has clinical contraindications and is not a general upgrade over alternating pressure, so it belongs in a documented care plan. Systems in this collection include the Drive LS9525 MasonAir and the PreserveTech lateral rotation system with on-demand low air loss.

Why does mattress depth matter?

Depth determines how far a patient can immerse into the surface before bottoming out against the bed deck. A heavier patient on a shallow surface compresses the air column completely at the sacrum, at which point the therapy has effectively stopped. Deeper systems such as the Joerns Dermafloat at 10 inches provide more immersion. Check depth against patient weight rather than assuming any powered system will work.

Do I need a bariatric width system?

If the bed deck is wider than 36 inches, yes. Beyond width, bariatric systems carry higher weight ratings and use pumps sized to fill a larger air volume without stretching the cycle time. A standard pump on an oversized surface produces a cycle too slow to be therapeutic. Drive's Med-Aire Plus bariatric range and the Joerns Arise 1000 series cover this.

What happens during a power outage?

Most systems have a static or CPR mode that holds the surface inflated when the pump stops, but this is not therapy and it is not indefinite. Where power continuity is a concern, or the patient will be transported, systems with battery backup such as the Wellell PD08503 Optima Auto with battery are the option to look at. Confirm battery duration against your realistic worst case.

Are replacement covers available?

Yes, for many systems. Covers are the part that wears and the part that gets contaminated, and replacing a cover is far cheaper than replacing a mattress system. See Bed Accessories for replacement mattress covers including the Med-Aire Essential 8 cover and defined perimeter covers. Match the cover to your exact system model.

Is an alternating pressure mattress covered by insurance?

Powered support surfaces may be covered as durable medical equipment when medical necessity criteria are met and documented, typically requiring evidence of pressure injury stage, failed conservative treatment or a defined risk profile. Group classifications and documentation requirements are set by the payer and are specific. Our Medicare Part B coverage guide is a starting point, and the treating physician's documentation determines the outcome.

MediDepot Purchasing Advantages

Price Match Guarantee: found the same system for less elsewhere? We will match the verified price.
Equipment Financing: useful when a facility is standardizing support surfaces across multiple beds.
Extended Warranty: coverage on pumps running continuously, which is where these systems fail first.
Military Discount: available for qualifying military personnel, veterans and facilities.
Request a Quote: surface and frame matching, bariatric width confirmation and multi-bed facility pricing.