Seven-crystal array for uniform fetal heart rate detection

The Avalon CL Ultrasound Transducer (866076) uses a seven-crystal piezoelectric array to capture the fetal heart rate via continuous-wave Doppler ultrasound. Six crystals are arranged around the perimeter of the sensing face with one crystal centered, positioned in equilateral triangle formations so that the acoustic beam pattern overlaps uniformly across the entire transducer face. In practical terms, this geometry means clinicians spend less time hunting for the fetal heart with the transducer — the signal is strong across a wider footprint on the maternal abdomen, which is particularly valuable during labor when the fetus moves frequently or when monitoring through higher BMIs.

Smart Transducer: onboard processing, digital transmission

Unlike legacy fetal ultrasound transducers that send raw analog signals down a cable to the monitor for processing, the 866076 is a Smart Transducer — it contains its own microprocessor and signal processing hardware. The Doppler signal is converted and processed at the transducer, then transmitted digitally to the Avalon monitor via the 866074 base station. This architecture delivers cleaner traces, better resistance to electromagnetic interference in busy L&D environments, and more consistent signal quality when multiple transducers are in use on a single patient. It also means the 866076 can be added to any compatible Avalon monitor without recalibration or channel tuning — the digital signal path is self-describing.

Twins, triplets, and automatic channel assignment

Multiple pregnancy monitoring is one of the most demanding scenarios in L&D, and the 866076 is engineered for it. Up to three 866076 transducers can be used simultaneously on a single Avalon monitor for twin or triplet monitoring, and the Avalon system assigns each transducer’s signal to FHR1, FHR2, or FHR3 automatically based on the order of placement — regardless of which base station slot or which port the transducer came from. That automation eliminates one of the most common sources of charting error in multiples monitoring. Combined with Cross-Channel Verification, which compares all active FHR signals in real time and alerts clinicians if two channels show suspiciously similar rates, the system helps prevent both MHR-FHR and fetal-fetal signal confusion.

Fetal Movement Profile for high-risk pregnancies

The 866076 supports Fetal Movement Profile (FMP), a Philips-exclusive parameter that evaluates fetal heart rate and gross body movements simultaneously and presents them as a combined profile on the Avalon monitor. FMP is particularly useful in high-risk pregnancy monitoring and non-stress test workflows, where fetal activity correlated with heart rate accelerations provides clinical assurance. Philips’ published data suggests FMP monitoring can reduce unnecessary secondary testing — which translates into fewer callbacks, fewer biophysical profiles, and better utilization of obstetric ultrasound suites.

Cableless mobility for labor and delivery

Freedom of movement during labor is linked to patient comfort, shorter labor times, and better overall experience. The 866076 eliminates the patient cable entirely — the transducer communicates wirelessly with the Avalon CL Base Station (866074) over Philips IntelliVue Instrument Telemetry at ranges up to 100 m (300 ft) in line of sight. Mothers can walk the halls, use a birthing ball, shower, or labor in a tub without losing the fetal heart rate trace. The transducer housing is fully watertight, so underwater monitoring is explicitly supported for hydrotherapy and water birth protocols.

Works with the entire Avalon FM family

The 866076 is part of the Avalon CL system and requires the Avalon CL Base Station (866074). That base station in turn connects to any fetal sensor socket on the Philips Avalon FM20, FM30, FM40, or FM50 fetal monitor — or to the rear telemetry connectors on the FM40 and FM50. Avalon fetal monitor software release J.3 or higher is required. Up to four CL transducers and two IntelliVue CL Pods can be assigned to a single base station, so a complete cableless kit can monitor twins or triplets plus maternal SpO2 and NBP simultaneously from one hub.

Automatic assignment, charging, and Transducer Finder

Setup is plug-and-play: dock the 866076 in any slot on the base station and it is automatically assigned, paired, and recharged. A green or yellow LED on the transducer confirms when it is ready for use, and the built-in blue Finder LED helps clinicians quickly identify which transducer on the patient corresponds to which trace on the monitor — critical during multiples monitoring or shift change. The internal Lithium-Ion battery powers the device wirelessly throughout labor; charge status is reported to the fetal monitor, and low-battery, out-of-battery, loss-of-radio, and malfunction alarms are all built into the Avalon CL system so clinicians are alerted before the trace is interrupted.

Patient safety and construction

The 866076 is a Type CF applied part, meaning its patient connection is rated for direct cardiac application and is defibrillation-resistant. The housing is latex-free, ergonomically contoured for maternal comfort, and sealed at the factory. The transducer is not user-serviceable for battery replacement, which requires the dedicated Philips CL transducer battery replacement tool used by authorized technicians. IPR Medical handles battery service and housing reseal in-house on customer units.

IPR Medical — sales, repairs, parts, and service

IPR Medical sells refurbished and patient-ready Philips Avalon CL transducers and base stations, and we buy surplus or decommissioned units from facilities upgrading their fetal monitoring fleet. Our service team performs battery replacements, housing seal service, crystal array inspection, front-end repair, and functional testing on the 866076 using Philips-specified procedures and test equipment. We also stock replacement belts, belt buttons, ultrasound transmission gel, and the complete Avalon CL transducer line — so a single call covers the transducer, the accessories, and the service that keeps it running.

IPR Medical buys, sells, repairs, and stocks parts for the Philips Avalon CL Wireless Ultrasound Transducer (866076). Contact us at 855-477-8866 or cs@iprmed.com.

Trademark Notice: Philips, and all other brand names, model names, and part numbers shown are trademarks of their respective owners and are used on this page only to identify the original manufacturer’s equipment offered here, consistent with nominative fair use. This listing is offered by IPR Medical, an ISO 9001:2015-certified independent service organization, and is not sponsored by, affiliated with, or endorsed by Philips.