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Published: May 24, 2026 Last Updated: May 26, 2026 Written by: Fonga O

Prius DynaFlow vs Joerns Dolphin: Fluid Immersion Mattress Comparison

Key Takeaways

  • If you are a discharge planner or family caregiver researching advanced pressure injury prevention, you have likely encountered both the Joerns Dolphin Fluid Immersion Simulation System and the Prius DynaFlow Immersion Mattress System. Both address Stage 1 to 4 pressure ulcer prevention and treatment. The right choice depends on the clinical situation, the care setting, and the budget.

  • The Joerns Dolphin uses a closed-loop microprocessor system that automatically conforms to the patient's body shape, simulating the effect of floating in water. It is a single-function, fully autonomic system designed specifically for the most complex wound care situations, Stage IV pressure ulcers, post-operative flaps and grafts, and spinal cord injury patients.

  • The Prius DynaFlow delivers four therapy modes in one system, immersion, low air loss, pulsation, and 3-in-1 alternation, at a more accessible price point. It is the more versatile option for facilities and home care settings where patient needs vary and multiple therapy modes are clinically useful.

  • Each is recommended for specific use cases, which are mapped clearly in the comparison and decision section below.

  • Both systems support 500 lbs at their standard 36-inch width. The DynaFlow also offers 42-inch (750 lbs) and 48-inch (1,000 lbs) wider configurations. The Dolphin offers a 42-inch ultra-wide model and a V-Matt for step deck frames.

Browse by Brand: Prius Healthcare USA | Joerns Healthcare

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Bottom Line: Both systems deliver meaningful clinical results. The Dolphin does one thing exceptionally well and requires nothing from the caregiver after power-on. The DynaFlow does more things, costs less, and gives clinicians and caregivers more options to match therapy to changing patient needs.

Prius DynaFlow Immersion Mattress System: What It Is and What It Does Best

The Prius DynaFlow is a multi-mode immersion therapy mattress system that delivers four distinct therapies from a single unit: immersion, low air loss, pulsation, and 3-in-1 alternating pressure. It is positioned as a cost-effective alternative to fluid immersion simulation systems and directly addresses the price barrier that limits access to immersion therapy.

Key Specs (Standard 36" Model):

  • Mattress Dimensions: 80"L x 36"W x 10"H
  • Weight Capacity: 500 lbs (36" model); 750 lbs (42" model); 1,000 lbs (48" model)
  • Mattress Weight: 39.6 lbs
  • Cell Count: 18 air cells, black nylon with PU coating
  • Control Unit Dimensions: 12.3"L x 6.7"W x 4.9"H
  • Control Unit Weight: 14.9 lbs
  • Voltage: 110-120V, 60Hz
  • Cycle Time: 3 to 95 minutes
  • Pressure Range: 15 to 52 mmHg (±4 mmHg)
  • Comfort Controls: 10 digital adjustable settings
  • CPR Release: Full deflation within 20 seconds
  • Foam Base: 2-inch convoluted foam for power failure support
  • Alarms: Visual and audio for bottom-out and power failure

Four Therapy Modes in One System

Immersion mode (1 to 5 minute cycles): Provides optimal pressure reduction through immersion therapy, comparable to fluid immersion simulation systems, at a lower cost.

Low air loss: Actively manages moisture and temperature at the skin interface — the microclimate management that the Dolphin requires an add-on to achieve. For patients with high moisture wound presentations, this is a meaningful built-in advantage.

Pulsation mode (60-second cycles): Simulates a gentle massage effect, improving circulation and patient comfort during extended bed rest.

3-in-1 alternating pressure: For patients who do not require immersion therapy, alternating pressure mode is available from the same unit without changing equipment.

Auto-Set and Fowler Detection

The Auto-Set function sets optimal mattress pressure based on patient height and weight entered at setup — removing manual guesswork from pressure calibration. When the head of the bed is raised, Fowler Mode detects the angle change and automatically increases cell pressure to prevent bottoming out at the sacrum. This is a practical safety feature for patients who spend extended time in elevated head positions.

Honest Limitations of the DynaFlow

Requires manual weight entry at setup. Unlike the Dolphin's fully autonomic microprocessor, the DynaFlow requires the caregiver to enter patient height and weight to initiate Auto-Set calibration. This is a simple step but it is not zero-intervention.

Active air cell system. The DynaFlow uses 18 active air cells. Active systems require monitoring and respond to power interruptions differently than closed passive systems. The 2-inch convoluted foam base provides temporary support during power failure, but ongoing therapy does not continue without power.

Not specifically clinician-designed for Stage IV post-surgical care. The DynaFlow treats Stage 1 to 4 pressure ulcers and performs well across the full spectrum. However, its clinical evidence base for the most complex post-surgical flap and graft presentations is less established than the Dolphin's.

🎯 BEST FOR: Facilities and home care settings that need multi-mode flexibility, Stage 1 to 4 pressure injury prevention and treatment, patients with high moisture wound presentations where built-in low air loss is an advantage, and any situation where a cost-effective immersion system is clinically appropriate and the Dolphin's price point is a barrier.

Joerns Dolphin FIS: What It Is and What It Does Best

The Joerns Dolphin Fluid Immersion Simulation System was originally developed for the dry transport of U.S. Navy dolphins. That origin is relevant, the technology was designed from the ground up to simulate the buoyant, pressure-free support of water immersion without using water.

The system uses a microprocessor that monitors the support surface more than 100 times per second, continuously adjusting to the patient's weight, position, and movement. The surface conforms to the body rather than forcing the body to conform to it, eliminating gradient shear forces that damage tissue and slow wound healing.

Key Specs:

  • Sizes: Standard 35"x82", Ultra Wide 42"x82", V-Matt 35"x88" (step deck)
  • Weight Capacity: 500 lbs
  • Mattress Weight: 22 lbs
  • Control Unit Weight: 10 lbs
  • Battery Backup: 12 hours
  • Warranty: 2 years on both mattress and control unit
  • Proven Across: 450,000+ patients in hospitals, long-term care, and home settings

For an in-depth clinical review of the Joerns Dolphin specifically, read our full Joerns Dolphin Fluid Immersion Simulation review.

What the Dolphin Does Best

Fully autonomic operation. The caregiver turns it on. The microprocessor does everything else — continuously, throughout the day and night. For ICU patients who cannot tolerate repositioning, ventilated patients, or home care situations where caregiver availability is limited, this zero-intervention approach is the Dolphin's most clinically valuable feature.

Stage IV and post-surgical care. The Dolphin is specifically engineered for the most complex wound care presentations, Stage IV pressure ulcers, post-operative flaps and grafts, and spinal cord injury patients once acute injuries have stabilized. It is not a general-purpose pressure management mattress.

No heat, no dehydration. Unlike air-fluidized beds that blow warm air through the mattress surface, the Dolphin uses a closed system that maintains comfortable temperature conditions. This matters for patients whose skin integrity is already compromised.

Auto-firm for transfers. The system firms up automatically to assist with patient repositioning and transfers, reducing caregiver injury risk during care activities.

Honest Limitations of the Dolphin

Single therapy mode. The Dolphin delivers fluid immersion simulation and nothing else. For patients whose needs shift — who need alternating pressure at one stage and immersion at another — switching to a different mode is not an option without changing the system.

Microclimate management requires an add-on. The clinical study cited above found significantly higher complication rates (maceration, dehiscence) with the Dolphin FIS when used without a ClimateCare microclimate cover. The Dolphin does not natively manage moisture at the skin interface the way a low air loss system does. This is a real limitation for high-moisture wound presentations.

Price. The Dolphin carries a higher price point than comparable immersion systems. This is acknowledged in the product file itself, and it is the primary reason many facilities and families explore alternatives.

🎯 BEST FOR: ICU and post-surgical patients with Stage IV pressure ulcers, post-operative flap and graft healing, and spinal cord injury patients where fully autonomic zero-intervention therapy is the clinical priority. Also suited for home care patients whose caregivers need a system that requires no ongoing adjustment.

Which One Should You Choose?

Choose the Joerns Dolphin if:

  • The patient has Stage IV pressure ulcers, post-operative flaps or grafts, or is a spinal cord injury patient
  • Fully autonomic therapy with zero caregiver adjustment is required
  • The patient cannot tolerate repositioning at all
  • Budget is secondary to getting the most established autonomic immersion system available
  • Microclimate management will be provided through a separate add-on (ClimateCare)

Choose the Prius DynaFlow if:

  • The patient has Stage 1 to 4 pressure ulcers and multi-mode therapy flexibility is clinically useful
  • Built-in low air loss for microclimate management is a priority
  • The care setting requires a cost-effective immersion alternative without sacrificing meaningful clinical function
  • A wider bariatric configuration (42" at 750 lbs or 48" at 1,000 lbs) is needed
  • The facility or home care team can manage simple Auto-Set calibration at setup

If the decision is primarily about budget: The DynaFlow delivers immersion therapy, low air loss, pulsation, and alternating pressure from a single system at a fraction of the Dolphin's cost. For most Stage 1 to 3 presentations and many Stage 4 situations, it is clinically appropriate and practically superior in terms of therapy flexibility.

If the decision is about the most complex wound presentations: The Dolphin's fully autonomic microprocessor, its closed-loop pressure monitoring more than 100 times per second, and its established clinical record across 450,000+ patients make it the more defensible choice for ICU, post-surgical, and spinal cord injury presentations where the stakes are highest.

Six Key Differences Between the DynaFlow and the Dolphin

1. Therapy modes. The DynaFlow offers four modes (immersion, low air loss, pulsation, alternating pressure). The Dolphin offers one (fluid immersion simulation).

2. Microclimate management. The DynaFlow includes built-in low air loss for moisture and temperature management. The Dolphin requires a separate ClimateCare add-on to achieve equivalent microclimate management.

3. Operation. The Dolphin is fully autonomic,  turn it on and the microprocessor handles everything. The DynaFlow requires initial Auto-Set calibration and caregiver adjustment of therapy modes.

4. Width options. The Dolphin is available in 35", 42", and V-Matt 35"x88" configurations. The DynaFlow is available in 36", 42", and 48" widths with capacities from 500 to 1,000 lbs.

5. Weight. The Dolphin mattress weighs 22 lbs. The DynaFlow mattress weighs 39.6 lbs. For home care delivery and installation, the Dolphin is lighter.

6. Price. The DynaFlow is a cost-effective alternative. The Dolphin carries a premium price. Both are available through MedShopDirect — call 833-499-4450 for current pricing.

What Fluid Immersion Therapy Actually Does

Standard foam and alternating pressure mattresses manage pressure by redistributing it across the sleep surface. Fluid immersion therapy goes further, it allows the patient's body to sink into the surface so that weight is distributed across the largest possible contact area, reducing peak interface pressure at bony prominences.

The National Pressure Injury Advisory Panel (NPIAP) identifies pressure redistribution as a foundational element of pressure injury prevention and treatment. Immersion therapy, where the support surface conforms to the body rather than the body conforming to the surface, delivers the highest level of pressure redistribution currently available in mattress-based systems.

According to the Wound, Ostomy and Continence Nurses Society (WOCN), advanced support surfaces including immersion and fluid-based systems are recommended for patients with existing Stage 3 or Stage 4 pressure injuries, or those at very high risk due to compromised tissue perfusion, limited mobility, or post-surgical fragility.

Both the Joerns Dolphin and the Prius DynaFlow deliver immersion therapy. They differ significantly in how they deliver it, what else they offer, and what they cost.

The Clinical Evidence Behind Fluid Immersion Simulation

A randomized controlled trial comparing fluid immersion simulation to air-fluidized bed therapy for post-operative pressure ulcer care , published in Wound Repair and Regeneration by researchers at Northwestern University, provides the most direct clinical evidence available for the Joerns Dolphin FIS system.

The study enrolled 80 patients with Stage III or IV pressure ulcers undergoing surgical flap closure and randomized them between the Joerns Dolphin FIS system and an air-fluidized bed. Key findings were as follows.

Flap closure success at 14 days was similar between groups, the two systems performed equivalently on the primary outcome. However, complications were significantly higher in the FIS group without microclimate management (40% vs. 17%). When a ClimateCare microclimate cover was added to the FIS group mid-study, complications dropped from 71% to 16% and matched air-fluidized bed outcomes. Nurse and patient acceptability scores were similar across both groups.

The study was financially supported by Joerns Healthcare LLC. This is a relevant disclosure for interpreting the results.

The clinical takeaway is that FIS technology, as used in the Joerns Dolphin, is clinically equivalent to air-fluidized bed therapy for post-operative flap management when paired with adequate microclimate management. Without microclimate control, complications from moisture and maceration increase significantly.

Frequently Asked Questions

What is the difference between the Prius DynaFlow and the Joerns Dolphin?

The Joerns Dolphin is a single-mode, fully autonomic fluid immersion simulation system designed for Stage IV wounds and post-surgical care. The Prius DynaFlow delivers four therapy modes, immersion, low air loss, pulsation, and alternating pressure, at a more accessible price. The Dolphin requires no caregiver adjustment after power-on. The DynaFlow requires initial weight/height entry for Auto-Set calibration.

Which is better for Stage 4 pressure ulcers?

Both treat Stage 4 pressure ulcers. The Joerns Dolphin has the more established clinical record for this presentation, particularly for post-operative flap and graft management. The Prius DynaFlow treats Stage 1 to 4 ulcers effectively and adds built-in low air loss for microclimate management that the Dolphin requires an add-on to provide.

Is the Prius DynaFlow a good alternative to the Joerns Dolphin?

Yes. The DynaFlow delivers comparable immersion therapy with additional modes (low air loss, pulsation, alternating pressure) at a lower price point. For facilities and families where the Dolphin's price is a barrier, the DynaFlow is a clinically appropriate alternative for most pressure injury presentations.

Does the Joerns Dolphin have microclimate management?

Not natively. Clinical research found significantly higher complication rates (maceration, dehiscence) when the Dolphin was used without a ClimateCare microclimate cover. Adding ClimateCare to the FIS system resolved those complications and matched air-fluidized bed outcomes. The Prius DynaFlow includes built-in low air loss for microclimate management.

What weight capacity does each system support?

Both the Joerns Dolphin (standard 35" model) and the Prius DynaFlow (standard 36" model) support 500 lbs. The DynaFlow also offers 42-inch (750 lbs) and 48-inch (1,000 lbs) configurations. The Dolphin offers a 42-inch ultra-wide model.

Can these systems be used in home care?

Yes. Both systems are used in home healthcare settings. The Dolphin's 22 lb mattress and compact 10 lb control unit install easily on home hospital beds. The DynaFlow's hanging bracket fits all bed types. Both require a power source and a compatible hospital bed frame.

Does the Joerns Dolphin require caregiver intervention?

Minimal. The caregiver powers on the system before placing the patient. The built-in microprocessor monitors and adjusts continuously from that point, no manual repositioning or adjustment is required. This fully autonomic operation is one of the Dolphin's most clinically valuable features for high-acuity patients.