Löwenstein Prisma Smart
See your full Prisma Smart therapy data
CPAP Clarity reads the files from your Löwenstein Prisma Smart SD card and shows you everything the prisma APP leaves out: per-event AHI breakdown, pressure and leak curves, respiratory rate and volume, breath-by-breath flow limitation, and your actual machine settings.
What CPAP Clarity shows you
The Prisma Smart separates obstructive from central apneas using forced oscillation, and scores hypopneas and RERAs. CPAP Clarity shows every event with its timestamp, not just the single AHI number the prisma APP reports.
The SD card carries full pressure and leak waveforms in Löwenstein's WMEDF signal format. CPAP Clarity decodes them in your browser; our validation diffed them sample by sample against OSCAR.
Breathing rate, tidal volume, and minute ventilation, derived breath by breath from the respiratory flow channel on the card. These help you and your provider understand ventilation patterns.
When softPAP exhale relief is active, CPAP Clarity charts the inhale and exhale pressure envelopes, so you can see the relief actually working through the night.
A continuous flow limitation index, derived breath by breath from the respiratory flow channel and charted through the night. The card also records vibratory snore and flow-limitation event markers; CPAP Clarity does not display those markers yet, and says so rather than promising them.
Your Prisma Smart records its mode, pressure limits, softPAP level, softSTART ramp, tube diameter, and auto-start setting. CPAP Clarity reads them directly from the card.
Nightly usage hours, compliance percentage, consistency scoring, and weekend vs weekday patterns, far beyond the operating-hours counter on the device display.
Every Prisma Smart number CPAP Clarity shows was cross-checked against OSCAR on real contributor data: 29 comparison rows, zero out of tolerance.
How to import your data
Remove the SD card
Power the machine off. The SD card slot is on the side of the device near the base, next to the power cord connection. Push the card in until it clicks, then pull it out. Any standard full-size SD card reader works.
Insert into your computer
Plug the SD card into a USB card reader connected to your computer. You should see folders and a config file appear on the card.
Drop the folder on CPAP Clarity
Open CPAP Clarity, go to the import page, and drag the entire SD card folder onto the drop zone. Pick the top level of the card so the settings file comes along. CPAP Clarity reads everything automatically.
Frequently Asked Questions
Does CPAP Clarity work with my Prisma Smart?
Yes. CPAP Clarity fully supports the Löwenstein Prisma Smart in both its APAP and CPAP modes, the first continental-European device we added. The parser was built and validated on real contributor data and cross-checked against OSCAR with zero out-of-tolerance rows. If you have the CPAP-only prisma SOFT sibling, it shares the same device family; our validation data is from a Prisma Smart, so if a SOFT card reads oddly, tell us through the feedback page.
What does the prisma APP show compared to CPAP Clarity?
The prisma APP shows four nightly numbers: therapy duration, AHI, leakage, and a sleep quality rating, plus a diary and a PDF report. The full record (every event with its timestamp, pressure and leak waveforms, respiratory metrics) is written to the SD card and normally read only by clinicians using prismaTS software. CPAP Clarity reads that same card in your browser.
What does the Prisma Smart record on the SD card?
If an SD card is in the slot, the device saves your therapy data to it automatically. The card carries the machine's settings, per-event annotations (obstructive and central apneas, hypopneas, RERAs, flow limitation, and vibratory snore), and waveform signal files with pressure, leak, and respiratory flow. Cards from 2 GB to 32 GB work. One display note: CPAP Clarity shows the apnea, hypopnea, and RERA events on your timeline; the card's snore and flow-limitation markers are not displayed yet.
How does it tell obstructive from central apneas?
The Prisma Smart uses forced oscillation: during an apnea, the machine sends tiny pressure oscillations down the hose and reads the reflection to test whether your airway is open or closed. An open airway with no breath is scored central; a closed one is scored obstructive. The classification lands in the card's event files, and CPAP Clarity shows both counts separately.
Where is the SD card slot?
On the side of the device, near the base, next to the power cord connection. Push the card in until it clicks to seat or release it. Power the machine off before removing the card so the last session finishes writing.
Do I need the SD card, or can I use the app or cloud?
You need the SD card. The prisma APP shows summaries, and on the max variant the built-in modem sends data once a day to prisma CLOUD for your care provider, not for you. The card is the only way to read the full files yourself, and CPAP Clarity reads them without anything leaving your browser.
Does it work with my Prisma Smart plus or max?
Yes. The Prisma Smart comes in base, plus, and max variants: plus adds Bluetooth for the prisma APP, max adds an integrated modem for prisma CLOUD. All of them write the same therapy data to the SD card, which is what CPAP Clarity reads.
Is my data safe?
All processing happens in your browser. Your CPAP data never leaves your computer and is never uploaded to any server. CPAP Clarity stores your data in your browser's local storage so you can return to it later without re-importing.
Related Reading
- Löwenstein Prisma Smart: Data Access Guide : the full walkthrough of this device's data and import flow.
- How to Read Your CPAP Data : a guide to understanding every metric on your dashboard.
- What Is AHI? : the headline number, what counts as an event, and what the thresholds mean.
- Understanding Flow Limitation : the partial obstructions that do not count as scored events.