SonoStar SM-90 fetal monitor, angled screen body with the paper compartment printing a trace

Product Details

SM-90 Fetal Monitor

SM-90

Fetal monitor: 7-inch colour touch screen folding 90 degrees, built-in 152 mm printer, fetal heart rate and contraction curves, waterproof probe.

Brand: SonoStar
Price: On request
Probe frequency: 1.0 MHz; dedicated digital signal processing unit; measurement range 50-210 bpm
Connection: Self-contained 7-inch touch screen and built-in printer, works standalone; connects to an obstetric central station
Charging: See specifications
Category: ECG Monitor

Request a quote

Product overview

The SM-90 covers the stages of labour, including the antenatal period and delivery, for both fetus and mother, and can be connected to an obstetric central station. The unit is light, takes little space and is simple to operate: the settings are straightforward and are stored automatically.

Fetal heart rate, contraction pressure and fetal movement are shown as figures and as curves. The 7-inch TFT colour touch screen folds through 90 degrees, and a 152 mm thermal printer is built in. DSP signal processing identifies and measures the fetal heart rate in real time.

The fetal probe has a built-in fetal stimulation function under patent, is waterproof and is highly sensitive. More than 12 hours of data are stored and can be replayed and printed, and records can be annotated for particular and clinical patients. Fetal movement is detected automatically. Acoustic output is low; the ultrasonic intensity of this model is given in the specifications.

Technical specifications

Specifications

Positioning

Item	Data
Use	Monitoring through the stages of labour, including the antenatal period and delivery, for fetus and mother
Networking	Connects to an obstetric central station

Main features

Item	Data
Body	Light, space-saving, simple to operate
Interface	Fetal heart rate, contraction pressure and fetal movement as figures and curves
Settings	Straightforward setup, stored automatically
Alarms	Alarm system included
Screen	7-inch TFT colour touch screen, folds through 90 degrees
Printer	Built-in 152 mm thermal printer
Signal processing	DSP technology identifies and measures the fetal heart rate in real time
Fetal probe	Built-in fetal stimulation function under patent; waterproof and highly sensitive
Data storage	More than 12 hours stored, replayed and printed
Record annotation	Annotation of records for particular and clinical patients
Acoustic output	Low output; intensity of this model stated below
Fetal movement	Detected automatically

Fetal heart rate

Item	Data
Probe	Multi-crystal, wide beam, pulsed operation, high sensitivity
Ultrasonic intensity	Below 5 mW/cm²
Frequency	1.0 MHz
Signal processing	Dedicated digital signal processing unit
Measurement range	50-210 bpm
Alarm range	Upper 160, 170, 180, 190 bpm; lower 90, 100, 110, 120 bpm
Maximum audio output	1.5 W

Contraction pressure

Item	Data
Measurement range	0-100 pressure units

Maternal SpO₂ and pulse rate

Item	Data
SpO₂ range	70 to 99 percent
SpO₂ accuracy	Plus or minus 3 percent
Pulse rate range	30-240 bpm
Pulse rate accuracy	Plus or minus 2 bpm

Non-invasive blood pressure

Item	Data
Systolic	6.7-32.0 kPa (50-240 mmHg)
Mean	3.4-26.6 kPa (25-200 mmHg)
Diastolic	2.0-24.0 kPa (15-180 mmHg)
Accuracy	Plus or minus 1.1 kPa (8 mmHg) or 5 percent of the reading, whichever is greater
Pulse rate range	40-240 bpm
Pulse rate accuracy	Plus or minus 2 bpm or 5 percent of the reading, whichever is greater
Operation	Manual start and stop of NIBP measurement

Display

Item	Data
Content	Fetal heart rate curve, contraction pressure curve, fetal movement marks, doctor event marks, time, volume and monitoring status; can be frozen and replayed

Power and physical data

Item	Data
Power	AC 100-240 V, 50/60 Hz, or 16.8 V lithium battery
Consumption	Below 20 W
Dimensions	350 x 320 x 85 mm (length x width x height)
Net weight	3.5 kg
Operating temperature	Plus 5 to plus 40 degrees C
Operating humidity	Below 85 percent
Operating pressure	86-106 kPa
Transport and storage temperature	Minus 10 to plus 55 degrees C
Transport and storage humidity	Below 93 percent
Transport and storage pressure	86-106 kPa

Acoustic output and consumables

Item	Data
Acoustic output limits	To IEC1157 (1992): negative peak pressure no more than 1 MPa, beam intensity no more than 20 mW/cm², spatial peak temporal average intensity no more than 100 mW/cm²
Intensity of this model	No more than 5 mW/cm²
Couplant gel	Viscous water-based compound, non-irritant and non-sensitising to skin, chemically stable, bacteriostatic

Options

Item	Data
Options	Maternal SpO₂, heart rate, NIBP and temperature; maternal ECG and respiratory rate; twin monitoring interface with twin fetal heart rate measurement; built-in network and PC connection; fetal acoustic stimulation (FAS)

Specifications updated 2026-11-01

Typical applications

The application scenarios on this page describe the device based on its technical data and configuration. The actual scope of application is the one stated in the product registration certificate. Follow your institution's procedures and the instructions for use.

Setting / department	Typical use	Configuration note
Bedside during labour	Fetal heart rate, contraction and movement on one screen	7-inch touch screen folding through 90 degrees, built-in thermal printer
Maternal parameters together	SpO₂, blood pressure and pulse rate alongside the fetal heart rate	Maternal SpO₂, pulse rate and NIBP as standard
Twin monitoring (optional)	Two fetal heart rates monitored separately	Twin interface and fetal acoustic stimulation optional

Usage and selection notes

The SM-90 belongs to the ECG and monitoring series.

The actual scope of application is the one stated in the product registration certificate. Please confirm the model and configuration with our product department.

For contraindications and precautions, refer to the instructions for use. The device must be operated by a licensed physician with the relevant qualifications.
The technical data on this page is taken from the product technical documentation; where it has been updated, the latest version applies. The listed departments and application scenarios describe the device based on its technical data, and the actual scope of application is the one stated in the product registration certificate. This page makes no claim about clinical outcome and does not constitute clinical guidance.