Byonyks X-1 APD Cycler; Byonyks Automated PD Set DS-1

The Byonyks X-1 APD Cycler is an automated peritoneal dialysis system for acute and chronic kidney disease treatment. It uses a peristaltic pump to infuse dialysate into the patient's peritoneal cavity, allows it to dwell for a physician-prescribed time, then drains the fluid. The system includes a reusable cycler unit and a sterile single-use disposable tubing set with cassette.

The Byonyks device uses a rotary peristaltic pump with stepper motor-driven valves, whereas the predicate Fresenius Liberty Cycler uses a diaphragm pump with dual stepper motors. Both achieve identical volumetric accuracy (±2% fill, ±3% drain), employ pressure sensors for safety interlocks, provide fluid warming, use loadcells for volume measurement, feature color touchscreen interfaces, and include identical safety alarms (overpressure, overtemperature, air-in-line). Both are powered by 100–240 VAC with internal lithium-ion battery backup.

ISO 10993-1:2018 (biocompatibility), IEC 60601-1:2005 (electrical safety), IEC 60601-1-2:2014 (EMC), IEC 60601-2-39 (APD-specific performance), AAMI/ANSI/ISO 10993-7:2008 (EO residuals), USP 161 (pyrogenicity), ANSI/AAMI/IEC 62304:2006 (software lifecycle), ISTA-3A (shipping), and FDA guidance on human factors validation and cybersecurity.

Although the pumping mechanism differs (peristaltic vs. diaphragm), both devices perform identically in fluid flow control, volumetric accuracy, and pressure-based safety response. The flow-rate control algorithm is functionally equivalent—both continuously monitor fluid pressure and dynamically adjust flow, terminating if high pressure is detected and resuming automatically. Safety mechanisms are identical (same alarm thresholds and types). Indications for use, intended patient population, operating environment, and electrical/physical interfaces are the same. Performance testing demonstrates the peristaltic pump achieves the same accuracy specifications. These functional and safety equivalences establish that the difference in pump technology does not introduce new risks.