This is an aftermarket-compatible wide-beam Doppler ultrasound transducer designed to function as a direct replacement for the M1356A fetal ultrasound transducer used with the Philips Series 50 family of fetal monitors (cardiotocographs), including the Series 50 A (M1351A) and the Series 50 IP-2 (M1353A). It is applied externally to the maternal abdomen and uses a wide-beam Doppler ultrasound element to detect fetal heart sounds, which the host monitor then processes through its auto-correlation algorithm to produce a continuous fetal heart rate (FHR) trace. This is a compatible aftermarket part — not a Philips-manufactured product — sold and supported by IPR Medical.

Device Type
Aftermarket-compatible external wide-beam Doppler ultrasound transducer for fetal heart rate (FHR)

Replaces / Cross Reference
M1356A fetal ultrasound transducer (also referenced as part 80310120)

Compatible Monitors
Philips Series 50 A (M1351A Single and Dual Ultrasound Twins), Series 50 IP-2 (M1353A), and earlier Philips/HP M1350 series fetal monitors

Patient Population
Antepartum (from approximately 20–25 weeks gestation) and intrapartum monitoring

Connector
Keyed round multi-pin connector compatible with the US, US1, or US2/ECG socket on the Series 50 monitor

Mounting
Snap-clip belt fixing onto compatible reusable fetal monitoring belts (e.g., M1562A); transducer knob adapter (M1356-43201) optional

IPR Medical buys, sells, repairs, and stocks parts for the Philips Series 50 fetal monitor family, including aftermarket-compatible fetal ultrasound transducers for the M1356A. Contact us at 855-477-8866 or cs@iprmed.com.

The Philips Avalon Ultrasound Fetal Transducer is a state-of-the-art device designed to deliver precise and continuous monitoring of fetal heart rate and activity. This advanced transducer leverages cutting-edge ultrasound technology to ensure accurate and reliable data, which is crucial for making informed clinical decisions during labor and delivery. Its ergonomic design and lightweight construction ensure patient comfort and ease of use for healthcare providers. The Philips Avalon Ultrasound Fetal Transducer integrates seamlessly with existing Philips fetal monitoring systems, providing a cohesive and efficient workflow in maternity wards. The device features a durable, high-quality build, ensuring consistent performance even in the most demanding clinical settings. Real-time, clear displays and alerts keep healthcare providers informed of any changes in fetal status, allowing for timely interventions. The transducer’s intuitive interface simplifies setup and operation, reducing training time and enhancing overall efficiency. Invest in the Philips Avalon Ultrasound Fetal Transducer for unparalleled accuracy, reliability, and comfort in fetal monitoring.

Brand new units may be available. Please contact us directly for more information.

The Philips Avalon Toco+ MP Transducer (M2735A) is the most versatile wired Smart Transducer in the Avalon family — it measures uterine activity via external Toco, captures maternal pulse with built-in Smart Pulse, and accepts adapter cables for direct fetal ECG (DECG), maternal ECG (MECG), or intrauterine pressure (IUP). One transducer covers four measurement modes, which is why labor and delivery floors keep the M2735A on hand even when most patients are monitored externally.

The Toco+ MP connects to any of the four fetal sensor sockets on Avalon FM20, FM30, FM40, or FM50 monitors via a standard D-shaped connector. Smart Pulse is always active when the transducer is applied, feeding maternal pulse into the monitor’s Cross-Channel Verification (CCV) feature to reduce the risk of mistaking maternal pulse for fetal heart rate. When DECG, MECG, or IUP monitoring is needed, the user simply plugs the appropriate adapter cable into the transducer’s auxiliary connector — the monitor automatically detects the mode.

OEM Part Number
M2735A (989803143681)

Measurements
Toco, Smart Pulse, DECG, MECG, IUP

Compatible Monitors
Avalon FM20, FM30, FM40, FM50

Connector
D-shaped (plug-and-play to any fetal sensor socket)

Auxiliary Connector
7-pin D-type for DECG/MECG/IUP adapter cables

Smart Pulse
Built-in, no separate SpO2 or MECG sensor required

IPR Medical buys, sells, repairs, and stocks parts for the Philips Avalon Toco+ MP Transducer (M2735A). Contact us at 855-477-8866 or cs@iprmed.com.

Also available from IPR Medical:
Philips M2734A / M2734B Smart Toco MP Transducer — wired external Toco with Smart Pulse  | 
Philips Avalon Ultrasound Fetal Transducer (M2736A) — wired US transducer for external FHR  | 
Philips Avalon CL Wireless Toco+ MP (866075) — cableless equivalent  | 
Philips Avalon CL Wireless ECG/IUP (866077) — cableless DECG/MECG/IUP  | 
Philips Avalon FM50 Fetal Monitor — host monitor

The Philips Avalon CL Wireless Toco+ MP Transducer (866075) is the cableless uterine activity transducer in the Avalon CL Fetal Transducer System — measuring uterine contractions via external Toco while simultaneously capturing maternal pulse through integrated Smart Pulse technology. It also includes a multi-purpose connector that accepts maternal ECG, fetal ECG (DECG), or intrauterine pressure (IUP) sensors, making the 866075 one of the most versatile transducers on the L&D floor. Paired with the Avalon CL Base Station (866074) and Avalon FM20, FM30, FM40, or FM50 fetal monitors, it delivers the same performance as wired Smart Transducers while letting mothers walk, shower, or reposition during labor at ranges up to 100 m (300 ft) line of sight.

The 866075 is watertight for underwater monitoring, weighs only about 0.6 lbs (0.27 kg), and docks directly into the Avalon CL base station for automatic pairing and battery recharging.

IPR Medical sells, buys, repairs, and stocks parts and accessories for the Philips Avalon CL system, including transducers, base stations, belts, and replacement batteries. Contact us at 855-477-8866 or cs@iprmed.com.