Bariatric & Specialty Configurations

Wide 42-Inch Dolphin FIS Mattress

This is the 42-inch-wide Dolphin FIS therapy mattress: 42 inches across, 82 inches long, 10 inches deep. People arrive here searching for a bariatric Dolphin mattress, and the first thing to be clear about is what the extra width does and does not buy. It buys seven inches of room across. It does not buy a higher weight rating. Joerns groups the 35-inch and the 42-inch surfaces together in the same specification block at 500 lb, and publishes 1,000 lb against one configuration only — the 48-inch bariatric surface. Dolphin, Dolphin FIS, Fluid Immersion Simulation and AutoVector are registered trademarks of Joerns Healthcare LLC. We are an authorized Joerns dealer.

We are laboring this because the internet is not consistent about it, and because the consequence of getting it wrong is not a disappointment, it is a surface loaded past its rating with someone on it. If you have been quoted a capacity for a 42-inch Dolphin that sits somewhere between 500 and 1,000 lb, ask for the Joerns document it comes from. We looked, across the manufacturer’s spec sheet, its user-service manual, its product page and three independent retailer listings, and every one of them either places the 42-inch surface at 500 lb or reserves the 1,000 lb figure for the 48-inch. Above 500 lb, the answer is the 48-inch surface on a matching bariatric frame, and we would rather quote you that than sell you this.

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Scale drawing

Width and rated capacity are not the same thing

The same three figures, in words: every surface above is 82″ long, and only the width changes.

35″ × 82″: rated 500 lb — Standard Dolphin FIS, Low-Profile System
42″ × 82″: rated 500 lb — Wide 42-Inch
48″ × 82″: rated 1,000 lb — Extra-Wide 48-Inch

Wider across is not the same as higher rated. The 42-inch surface is 7 inches wider than the 35-inch and carries exactly the same 500 lb rating. The rating steps up once, at 48 inches, to 1,000 lb. Anyone quoting you a figure between the two is quoting something no Joerns document contains.

The marked column is the surface this page is about: 42″ wide, 82″ long, rated 500 lb.

Joerns states these as mattress capacities only. The bed frame underneath has its own rated load, and the combined weight must not exceed it — which is one of the things we check with you before anything ships.

Rent monthly Buy outright

Rent by the month

$X,XXX–$Y,YYY/mo

That is a placeholder, not a rate. Our monthly pricing is not published yet. Ask the order desk and you will get the real figure in writing before you commit to anything.

Billed monthly for as long as the surface is in use
Return it when the need ends, with no long-term commitment
One surface matched to the patient and the care plan

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Buy outright

Call for a quote

Purchase pricing depends on the configuration and the quantity. Ask the order desk for a written quote.

One-time price, with no monthly billing
The surface stays with the facility or the household
Warranty terms are the manufacturer’s; ask us to confirm them before you order
Often eligible for HSA or FSA funds with a Letter of Medical Necessity; your plan administrator decides.

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Models we carry

Joerns Healthcare Dolphin® FIS® Therapy Mattress, 42-inch

Shipped by freight, with the lane quoted before you order
Cleaned and function-tested before it ships
Itemized invoices for plan and facility claims

Who this rental is for, and when it is needed

Width is a clinical variable in its own right, separate from weight. A person can be well within 500 lb and still have no room to turn on a 35-inch surface — broad across the shoulders or the hips, a large abdomen that redistributes when they roll, contractures that hold an arm or a leg out from the body, or an amputation that changes how weight sits. On a narrow surface those people end up with a shoulder, an elbow or a hip riding at the edge of the mattress, which is the one place a therapy surface cannot do its job and the one place a frame rail is waiting.

The other reason is care. Repositioning someone with two caregivers, changing a dressing on a sacral wound, rolling for a bed bath or a pad change: all of it needs room on the mattress rather than room in the room. Discharge planners often specify a wider surface for exactly this and write it down as "bariatric", which is where the confusion starts — a wide surface and a high-capacity surface are two different orders and this page is the first of the two.

Joerns describes the technology as highly effective for the prevention and healing of pressure injuries through Stage 4 as well as for treating patients with post-operative flaps and grafts, and says it may also be used for patients whose medical condition precludes turning and repositioning, or where these interventions may be contraindicated, and for patients with spinal cord injury once the acute injury has been stabilized and the patient has been cleared by a physician. Those are the manufacturer’s indications in the manufacturer’s wording, and Joerns adds that they are guidelines to be taken only as recommendations for consideration during individual patient assessment by the clinician. The person who decides is the wound care nurse or the physician, not us and not a web page.

Situations we set this up for

A person within 500 lb who still has no room to turn on a 35-inch surface
Shoulders, hips or an abdomen that reach the edge of the current mattress
Two caregivers repositioning together and running out of mattress
Contractures or an amputation that change how the body sits on the surface
A discharge note asking for a "bariatric" surface without naming a capacity
A 42-inch bed frame already in place
A sacral or trochanteric wound that needs room to turn away from

Models and specifications

Figures below are the manufacturer's published specifications. We confirm the exact unit and its ratings with you before it ships.

Wide 42-Inch at a glance

Published specifications for Wide 42-Inch Dolphin FIS Mattress
Sleep surface	42″ × 82″
Surface depth	10″
Weight capacity	Up to 500 lb
Therapy type	Autofirm; returns to the previous setting after approximately 15 minutes
Power and battery	Sealed 12 VDC rechargeable; approximately 12 hours
Alarms	Not published
HSA and FSA	Often eligible with a Letter of Medical Necessity; your plan administrator decides

Figures are the manufacturer’s published specifications. Anything shown as "Not published" is a figure we have not confirmed in writing; ask us and we will check the spec sheet for the exact unit before it ships.

Joerns Healthcare

Dolphin® FIS® Therapy Mattress, 42-inch

The 42-inch surface is 42 inches wide by 82 inches long by 10 inches deep — 107 by 208 by 25 cm — and Joerns rates it at 500 lb, the same as the 35-inch standard mattress. Joerns’ own specification block puts both widths in the standard group at that figure. Retail listings from independent sellers describe the 42-inch as the wide surface at up to 500 lb and reserve 1,000 lb for the 48-inch. There is no Joerns document we could find stating any other capacity for this width, and we will not publish a number we cannot point to.

That 500 lb is also the mattress figure alone. Joerns footnotes every capacity in the line with the same sentence: total weight must not exceed the bed frame manufacturer’s specified load capacity. In practice the frame is usually the binding constraint, and on a 42-inch bed it is worth checking twice, because 42-inch frames are sold across a wide range of ratings and the width does not tell you the number. Send us the frame make and model with the enquiry.

The therapy is the Dolphin system as it works on every surface in the line. The AutoVector control unit — 11.5 by 12.5 by 6 inches, 10 lb — monitors the support surface more than 100 times per second for any patient movement or surface changes, in Joerns’ words, and automatically measures the specific anthropometric characteristics of the individual patient as they engage the support surface, producing an individualized immersion profile Joerns describes as creating a near neutrally buoyant state. Joerns states there is no need for direct intervention or manual entry to adjust comfort settings. That matters more on a wide surface than a narrow one: a person with a larger body shape presents a very different load map when they roll from back to side, and the system re-measures rather than holding a setting someone dialled in at delivery.

Autofirm firms the surface for transfers and care procedures and, per Joerns, returns to the previous setting after approximately 15 minutes. A quick CPR deflation valve is fitted. The cover is smooth nylon with low friction and low shear properties, breathable and moisture vapour permeable. A sealed 12 VDC rechargeable battery in the control unit gives approximately 12 hours of alternate power if the system is disconnected or the mains fail. This 10-inch standard-depth surface has no safety cell — the foam cell is a Low Profile feature and the air-filled cell a V-Matt feature, and neither belongs here.

Dimensions: 42" (107 cm) W × 82" (208 cm) L × 10" (25 cm) D
Weight capacity: 500 lb — the same rating Joerns publishes for the 35-inch; mattress capacity only
Frame limit: Total weight must not exceed the bed frame manufacturer’s specified load capacity (Joerns)
Extra width: Seven inches wider across than the 35-inch standard surface
Control unit: AutoVector®, 11.5" W × 12.5" H × 6" D, 10 lb (4.5 kg)
Sensing rate: Joerns: monitors the support surface more than 100 times per second
Battery backup: Sealed 12 VDC rechargeable; approximately 12 hours
Care mode: Autofirm; returns to the previous setting after approximately 15 minutes
Emergency: Quick CPR deflation valve
Safety cell: None on this configuration — foam is Low Profile only, air-filled is V-Matt only
Electrical: 115/230 VAC, 50/60 Hz, 0.34/0.21 A
Operating conditions: 50–95 °F (10–35 °C), 30–75% RH non-condensing, IPX2
Warranty: Two years mattress, two years control unit (Joerns)

What makes it work at home

Seven inches more across

Forty-two inches wide against thirty-five. That is room to turn, room for two caregivers to work, and room for a shoulder or hip to stay on the therapy surface instead of riding the edge.

Rated 500 lb, and we say so plainly

Joerns groups the 35-inch and 42-inch surfaces at 500 lb. Only the 48-inch is rated 1,000 lb. Width and capacity are different specifications and we will not blur them to close a sale.

Re-measures as the body moves

Joerns states the AutoVector module monitors the support surface more than 100 times per second and measures the patient’s own anthropometric characteristics as they engage it. On a larger body shape, that re-measuring is the point.

Autofirm for two-caregiver repositioning

Firm the surface before a roll or a slide, then let it time out. Joerns states the system returns to the previous setting after approximately 15 minutes, so the therapy resumes on its own.

Approximately 12 hours of battery

A sealed 12 VDC rechargeable battery carries the control unit approximately 12 hours through an outage or a disconnection, and recharges once mains power returns.

Low-shear, breathable cover

Joerns describes the therapy pad fabric as smooth nylon with low friction and low shear properties, breathable and moisture vapour permeable, allowing air to circulate beneath the pad.

Delivery and setup

Width makes the fit check the important part of this order. A 42-inch surface needs a 42-inch deck: on a 36-inch frame it overhangs and is unsupported at the edges, and on a 48-inch frame it leaves several inches of gap on each side. Joerns’ warning covers exactly that second case — the risk of entrapment can arise when equipment is placed on bed frames that leave gaps of even a few inches between the therapy mattress and the head panel, foot panel and bed or side rails, and the equipment is not to be used when such gaps are present. We ask for the frame make, model, deck width and rated load before dispatch, and we check them rather than taking "it’s a wide bed" as an answer.

On the day, the existing mattress comes off, the therapy surface goes onto the deck, and the AutoVector unit hangs at the foot with hoses routed clear of the articulating sections and out of the walkway. The unit goes to a wall outlet, not a power strip. The caregiver walkthrough covers where the CPR valve is, what Autofirm does and that it times out by itself, what the battery covers, and the hand check Joerns instructs after any comfort adjustment — confirming by hand that the patient is not touching the mattress support platform. On a wide surface with two caregivers, we also walk through who stands where during a roll, because the extra width is only useful if the working room is on the side you need it.

How in-home setup and pickup work

Before we arrive

Confirm the frame deck width is 42 inches, not "wide" or "larger than standard".
Get the frame’s own rated load in writing — it is frequently lower than the mattress figure.
Have the person’s most recent charted weight, not an estimate from memory.
Leave working room on both long sides if two caregivers will reposition together.
Measure the route in: a 42-inch surface is light but bulky through a tight stair turn.
Keep a dedicated wall outlet free at the foot of the bed.
Check that rails, if used, still fit correctly against a 42-inch surface at 10 inches deep.
Keep the room within the 50–95 °F operating range Joerns publishes.

Choosing the right one

Choose between this and the 35-inch standard surface on room, not on weight. If the person is within 500 lb and turns comfortably on a 35-inch mattress with a hand’s width to spare at the shoulders, the narrower surface fits more frames and moves more easily. If they are within 500 lb and their shoulders, hips or abdomen reach the edge, or two people need to work on the mattress at once, the seven inches here is the whole reason to pay for a different configuration.

Choose between this and the 48-inch extra-wide surface on capacity and frame. Above 500 lb there is no decision to make: the 48-inch is the only Dolphin configuration Joerns rates at 1,000 lb, and it needs a bariatric frame to match, since Joerns describes the system as customizable to fit bed frames, including bariatric bed frames, up to 48 inches wide. Below 500 lb, going to 48 inches costs you frame options and room, so take it only if the width is genuinely needed. And if depth is the pressure point rather than width — a transfer that is marginal, a rail height that is wrong — look at the 8-inch Low Profile, which Joerns lists in a 42-inch width too and which carries the foam safety cell this 10-inch surface does not.

Paying for the rental

This surface is rented or bought privately. We do not bill Medicare, and we do not submit claims for you. The honest explanation is structural rather than commercial: Medicare sorts pressure-reducing support surfaces into three groups, fluid immersion simulation has no code in any of them, and Dolphin FIS is not an air-fluidized bed — E0194 is defined by warm filtered air driven through silicone-coated ceramic beads, and Joerns’ own claim is only that the Dolphin delivers many of the best elements of air-fluidized therapy. What a clinician can often document is Group 2. Its criteria are worth reading in full because people qualify without realizing: multiple stage 2 ulcers on the trunk or pelvis that have failed to improve over the past month while the beneficiary was on a comprehensive ulcer treatment program — which includes an appropriate Group 1 surface, regular assessment by a licensed practitioner, appropriate turning and positioning, wound care, moisture and incontinence management, and nutritional assessment and intervention; or large or multiple stage 3 or stage 4 ulcers on the trunk or pelvis; or a myocutaneous flap or skin graft for a pressure ulcer on the trunk or pelvis within the past 60 days, with a Group 2 or Group 3 surface in place immediately before a discharge in the past 30 days. A Standard Written Order has to reach the supplier before a claim is submitted.

On the private side, a mattress is a dual-purpose item, so it is not on a pre-approved HSA or FSA eligibility list on its own. What typically changes that is a Letter of Medical Necessity from a licensed clinician naming the condition, the item, why the item is needed for that condition and a duration. The plan administrator applies the IRS rules and decides; a card swipe is not substantiation and administrators routinely ask for documentation afterwards. We provide an itemised receipt showing the item, date, amount and a description suited to substantiation, and we do not draft or pre-fill the letter — that is the clinician’s document and its whole value lies in being theirs.

Insurance and funding guides

Mistakes we help people avoid

Reading "bariatric" as a capacity: On this line it is a width. The 42-inch surface carries the same 500 lb rating as the 35-inch. If the person exceeds 500 lb, this is not the right page and the 48-inch surface is.
Trusting the mattress rating over the frame rating: Joerns’ own footnote says total weight must not exceed the bed frame manufacturer’s specified load capacity. A 500 lb surface on a 400 lb frame is a 400 lb system. Get the frame number.
Putting a 42-inch surface on a 48-inch deck: Three inches of gap on each side at the hip is an entrapment risk, not a loose fit. Joerns states the equipment is not to be used where such gaps are present. Match the surface to the deck width.
Assuming the room will cope: A wider bed needs floor space on both sides if two caregivers reposition together, and it changes the clearance to a wall, a nightstand or a lift. Measure the room, not just the doorway.

When something else is the better choice

If the person weighs more than 500 lb, this is the wrong surface and we will say so rather than take the order — the 48-inch extra-wide configuration is the only one Joerns rates at 1,000 lb, and it needs a frame to match. If the frame is not 42 inches across, this is also the wrong surface until the frame changes. Beyond fit: if no clinician has asked for an advanced therapy surface, ask the wound care nurse or the discharge planner whether a covered Group 2 powered surface is the appropriate step first. Group 2 is the tier Medicare’s criteria are actually written around, it may cost the household nothing, and if it is clinically right for this person then it is right whatever it does to our order book. You should also know that Aetna’s Clinical Policy Bulletin 0430 lists fluid immersion simulation among items it considers experimental, investigational or unproven, names the Dolphin FIS system specifically, and describes it as institutional equipment that is inappropriate for home use, on the basis that evidence of its effectiveness in the home setting is insufficient. We think the equipment does real work, but that is a published payer position and you are entitled to see it before you commit. Last: a wider therapy surface does not reduce how often someone needs turning, checking or feeding. It makes the turning possible on the mattress. The care plan still belongs to the care team.

Urgent order

Discharge tomorrow? Tell us before you commit to a date.

Send the order desk the patient’s weight, the therapy the care team has specified and the ship-to address. We will come back to you with what is in stock, what the freight lane looks like and what can realistically arrive in time, before you promise anything to the family.

Weight and height of the patient
Therapy the care team has specified
Ship-to address and dock or door access
Date the surface has to be in the room

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Wide 42-Inch: common questions

Is the 42-inch Dolphin FIS a bariatric mattress?

It is the wide surface, not the high-capacity one. Joerns groups the 35-inch and 42-inch widths in the same specification block at 500 lb, and publishes 1,000 lb for the 48-inch configuration only. So a 42-inch surface gives seven inches more room across at the standard rating. If the person is above 500 lb, the 48-inch extra-wide surface is the one to ask about.

How much weight does the 42-inch surface hold?

Five hundred pounds, per Joerns. That is the mattress capacity only. Joerns’ footnote applies to every capacity it publishes: total weight must not exceed the bed frame manufacturer’s specified load capacity. Check the frame’s own rating, because on a wide bed it is often lower than the mattress figure and it is the number that governs.

I was quoted a higher capacity for a 42-inch Dolphin. Who is right?

Ask for the Joerns document. We checked the manufacturer’s spec sheet, its user-service manual and its product page, plus three independent retailer listings; all of them either place the 42-inch at 500 lb or attach the 1,000 lb figure to the 48-inch. If someone has paperwork from Joerns showing something else for a specific unit, we would want to see it before shipping that unit, and so should you.

Will a 42-inch mattress fit our bed?

Only if the deck is 42 inches. On a narrower frame it overhangs unsupported; on a wider one it leaves gaps. Joerns states the risk of entrapment can arise when equipment is placed on bed frames leaving gaps of even a few inches between the therapy mattress and the head panel, foot panel and bed or side rails, and that the equipment is not to be used when such gaps are present. Send us the frame make and model.

Does the wider surface work differently?

No. It runs on the same AutoVector control unit with the same behavior Joerns describes across the line: monitoring the support surface more than 100 times per second, measuring the individual patient’s anthropometric characteristics as they engage it, and requiring no direct intervention or manual entry to adjust comfort settings. Autofirm returns to the previous setting after approximately 15 minutes.

Does this model have a safety cell?

No. Joerns documents a foam based safety cell for Low Profile therapy mattress models only, and an air-filled safety cell for V-Matt models only, both as protection against bottoming out in the event of a power failure that exceeds battery life. This is a 10-inch standard-depth surface and it has neither. What it has is approximately 12 hours of battery backup in the control unit.

Can I get 42 inches of width at a lower height?

Yes. Joerns lists the Low Profile therapy mattress in 35, 42 and 48 inch widths at 8 inches deep, and Low Profile models are the ones fitted with the foam safety cell. If a transfer is marginal or rail height is a concern, ask about the 42-inch Low Profile rather than this 10-inch surface.

Can I rent rather than buy?

Yes — this configuration has a published monthly rental band, shown on this page. Purchase is quoted separately. Which makes sense usually turns on how long the surface is needed and whether the situation is a recovery with an end date or an ongoing care arrangement. Ask for both in writing and compare them against the expected duration.

Rent or buy the Wide 42-Inch

Tell us who it is for, the date it has to be in the room and where it ships to. We will confirm the model, the price both ways and the freight lane before you commit.

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