Löwenstein Prisma Smart Review: Data Access Guide

What Is the Löwenstein Prisma Smart?

The Löwenstein Prisma Smart is an auto-titrating CPAP (APAP) machine manufactured by Löwenstein Medical, a German device maker best known in continental Europe for hospital-grade ventilation equipment. The Prisma Smart is the consumer-facing member of the Prisma line, which also includes the Prisma Line bilevel and Prisma CR adaptive variants sold into sleep clinics.

Outside the United States, the Prisma Smart is a common prescription. You will see it in Germany, Austria, Switzerland, the Netherlands, Belgium, Croatia, the Czech Republic, and across Scandinavia. Distributors in the UK (Intus Healthcare among them) sell it to private-pay patients. In the US it is not a mass-market device, which is why most online CPAP communities are ResMed-dominated and most data tools historically ignored it.

If you received a Prisma Smart from your sleep clinic and wondered why the usual apps (myAir, SleepHQ) do not speak to it, the answer is simple: those apps are tied to ResMed hardware. Löwenstein ships its own clinician and patient apps (prismaCONNECT and Prisma APP), but neither gives you the kind of deep-dive a data-curious user wants.

CPAP Clarity now fully reads Prisma Smart SD card data client-side, free, with no account. Your data never leaves your browser.

Who Is the Prisma Smart For?

The Prisma Smart is a solid mid-range APAP for adults diagnosed with obstructive sleep apnea. It is a typical prescription when your sleep clinic either carries the Löwenstein line or ran a specific trial that pointed at this device. Clinicians praise it for the SoftPAP pressure-relief algorithm (Löwenstein's equivalent of ResMed EPR) and its quiet operation.

If you live in continental Europe and your clinic asked you to use the Prisma Smart, you are getting a machine that is functionally equivalent to a ResMed AirSense 10 AutoSet or a Philips DreamStation 2 Auto. All three devices do the same core job: detect apneas and hypopneas, adjust pressure to respond, and log everything for review.

Never change your own pressure settings based on anything you read in a data tool. Prescription adjustments are a conversation for your clinician, who has access to the clinical data view and your medical context.

What the Prisma Smart Records

Every night, the Prisma Smart writes a structured bundle to its SD card. The root of the card contains a plain-JSON configuration file (config.pscfg), a binary summary (statistic.psstat), a cloud-upload envelope, and a per-device logs directory. Inside a serial-numbered folder, each date gets its own subdirectory with one or more sub-session pairs: an XML event file (event_NNN.xml) and a companion waveform file (signal_NNN.wmedf) in a Löwenstein variant of the European Data Format.

CPAP Clarity parses the JSON configuration and the XML events right now. You see:

Apnea-Hypopnea Index (AHI): Events per hour of usage, the headline therapy number.

Event counts: Obstructive apneas, central apneas, unclassified apneas, hypopneas, RERAs (respiratory effort related arousals), flow-limitation events, and vibratory snore markers, all mapped to Löwenstein's event taxonomy via the same ID scheme the OSCAR project uses.

Pressure set-points: Minimum and maximum APAP pressure from your prescription, plus the SoftPAP relief floor (PSoft and PSoft minimum).

Therapy mode: APAP (standard), CPAP, or other modes the device supports.

Usage duration: Total nightly usage in hours and minutes, summed across sub-sessions when you take the mask off and put it back on.

Machine settings: Tube diameter, ramp behavior, auto start, SoftPAP mode.

The waveform files (per-minute pressure, flow, leak, and respiratory signals) are decoded by OSCAR and land in CPAP Clarity's next release. For now, the AHI donut, event counts, and pressure range give you enough to have a real conversation with your sleep clinician.

What You Will Not See in This Release

Waveform-derived metrics (continuous leak rate, tidal volume, minute ventilation, respiratory rate, and the time-of-night chart) are scheduled for the next CPAP Clarity release. These require decoding the Löwenstein .wmedf signal files, which sit in a vendor-specific EDF layout. The dashboard displays an amber notice explaining this on any Prisma Smart session.

Your headline numbers (AHI, usage, event counts, pressure set-points) are already fully correct and cross-checked against OSCAR. The limitation is visual polish, not numeric accuracy.

How to Import Your Prisma Smart Data

1. Power off the Prisma Smart and unplug it from the wall. Remove the humidifier chamber if you have one attached.
2. Eject the SD card from the side of the machine. Newer Prisma Smart units ship with a card labeled in hundreds of megabytes.
3. Plug the SD card into your computer (a USB SD reader or the built-in card slot on most laptops).
4. Open cpapclarity.com and drag the entire SD card folder onto the import zone on the home page. Select the whole SD card, not just the 0025220666/ therapy folder. The import needs the root-level config.pscfg to identify your device.
5. The dashboard loads. You will see a "Löwenstein Prisma Smart" label in the machine-settings card, your AHI for the most recent night, and a list of every session CPAP Clarity found on the card.

If your browser cannot read the folder, try a different SD reader or a different browser. iOS users: the whole-folder import works on iOS 17 and newer Safari. Android users: Chrome handles Löwenstein bundles the same way it handles ResMed and BMC bundles.

What the Numbers Mean

AHI under 5 is considered well-controlled therapy. AHI 5 to 15 is mild residual disease. AHI above 15 warrants a conversation with your clinician about whether the therapy is working. See AHI: what is a good score? for the full clinical framing.

RERA events show up in Prisma data because the firmware detects respiratory-effort arousals separately from apneas and hypopneas. RERAs do not contribute to the AHI number but they do count toward the respiratory disturbance index if your clinician uses that.

Pressure range (for example, 6 to 14 cmH2O) is the window your prescription allows the machine to auto-titrate inside. You should see the machine spending most of the night at a fairly steady pressure if your therapy is dialed in.

SoftPAP Standard with a PSoft of 6 means the machine drops pressure by a small amount when you exhale, to make the therapy feel less like breathing against a wall. This is a comfort feature, not a clinical parameter.

Settings Explained

Therapy mode. APAP is the default. The Prisma Smart can also run in fixed-pressure CPAP mode if your clinician prescribed it.

Pressure min and max. The boundary of the auto-titration window. Your clinician sets these based on your sleep-study titration results.

SoftPAP. The Löwenstein equivalent of ResMed's EPR. "Standard" means a gentle pressure drop on exhale; "Off" means constant pressure.

Soft start / ramp. The machine starts at a lower pressure and climbs to the therapy range over the configured ramp time (typically 30 minutes). Used by people who need to fall asleep before full therapy pressure arrives.

Auto start. When on, the machine begins therapy automatically when you breathe into the mask. When off, you press the power button.

Tube type. Recorded in centimeters of internal diameter. A 2.2 cm tube is the standard Löwenstein heated tube; a 1.9 cm is the slim hose variant.

None of these should be changed without your clinician's involvement.

Mask Compatibility

The Prisma Smart uses a standard 22 mm heated-tube connector at the machine end, which means it works with essentially any mass-market CPAP mask. Popular choices that pair cleanly include:

• ResMed AirFit P10 nasal pillow cushion (opens in new tab) for side sleepers who want minimal mask contact
• ResMed AirFit P30i nasal pillow cushion (opens in new tab) with hose-on-top routing for active sleepers
• ResMed AirFit F30i full face cushion (opens in new tab) for mouth breathers or higher-pressure nights
• Fisher & Paykel Brevida / Simplus and Philips DreamWear (DME-only in most US markets)

If you are new to CPAP and want help picking a mask style, try the Mask Finder Quiz to narrow down pillow, nasal, or full-face by breathing pattern and sleep position.

How the Prisma Smart Compares

Feature	Prisma Smart	ResMed AirSense 11	BMC G3 A20
Therapy modes	APAP, CPAP	APAP, CPAP, VAuto (11)	APAP, CPAP
Pressure relief	SoftPAP	EPR (Easy-Breathe)	Reslex
SD card format	JSON + XML + EDF variant	Proprietary EDF	Proprietary binary
Home market	Germany / EU	US / UK / EU	China / EU
Data in CPAP Clarity	AHI, events, pressure, settings (MVP)	Full (waveforms, timeline)	Full (waveforms, timeline)
Native app	prismaCONNECT, Prisma APP	myAir	None
US availability	Limited	Primary	Limited

If you live in the US and have a choice, most sleep clinics prescribe ResMed because the US supply chain is easier. If your European clinic prescribed the Prisma Smart, it is a good device and CPAP Clarity now gives you the same browser-based data workflow other brand owners have had for years.

Where to Buy

The Prisma Smart itself is not a consumer direct-purchase device in most markets. You get one through a sleep clinic or a licensed DME provider. If a clinician pointed you toward Löwenstein for a private-pay purchase, the manufacturer's patient portal has product information, the official clinician locator, and a list of regional distributors:

Löwenstein Medical (patient portal)

Accessories and Supplies

The machine is DME-channel only in the US, but the accessories and supplies you actually replace every few months are standard and work with any 22 mm CPAP setup. These are the items Prisma Smart owners end up buying most often:

• Universal 6 ft CPAP hose (opens in new tab) if your heated tube fails or you want a spare for travel
• Fleece hose cover (opens in new tab) to cut down on condensation ("rainout") in cooler rooms
• CPAP mask cleaning wipes (opens in new tab) for daily cushion maintenance
• SanDisk 32 GB microSDHC card (opens in new tab) if you need to replace the SD card that ships with the device
• Wellue O2Ring overnight pulse oximeter (opens in new tab) if you want to track SpO2 alongside your CPAP data

The Prisma Smart itself is not stocked on Amazon US, so we do not carry a direct Amazon link for the machine. If US distribution changes or additional verified regional distributors sign on, we will update this section.

When to Talk to Your Doctor

Bring your data to your clinician if you notice any of the following trends across multiple nights:

• AHI consistently above 5 despite therapy hours above 4.
• Max pressure hitting your prescribed ceiling every night.
• Frequent central apneas (if the Prisma Smart starts reporting them, your therapy may need an adaptive-servo device instead).
• Daytime sleepiness returning even though therapy numbers look normal.

CPAP Clarity is a data-visibility tool, not a diagnostic tool. Anything above is a conversation starter, not a prescription change.

Get Started with CPAP Clarity

Drop your Prisma Smart SD card folder into the home page to get your first dashboard. No account, no upload, no data leaves your browser. If you have questions or if something in your data does not look right, the feedback page goes to a real person.

Some links in this article are affiliate links. If you purchase through them, we may earn a small commission at no extra cost to you. This supports CPAP Clarity and keeps the site free. See our full disclaimer.

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Further reading:

• Understanding Your AHI Score
• CPAP Mask Finder Quiz
• BMC G3 A20 Review, a fellow non-US APAP with a similar data-access story