The Edan SD3 is one of the most versatile and widely used handheld Dopplers in Canadian clinical practice. Built on a common platform with interchangeable waterproof probes, the SD3 system supports both fetal heart rate monitoring and peripheral vascular assessment — making it an efficient, cost-effective choice for practices that need one device to do more. Surgo stocks the full SD3 ecosystem: every device variant, every probe frequency, and every consumable you need to keep your SD3 operational.

Edan SD3 Devices

Edan SD3 Ultrasonic Fetal Doppler With Audio Recorder Playback The SD3 with Audio Recorder Playback adds a valuable layer of clinical utility to the standard fetal Doppler. In addition to real-time fetal heart rate monitoring, this model allows practitioners to record and replay audio — useful for documentation, patient education, or sharing findings with other members of the care team. Compatible with 2 MHz and 3 MHz interchangeable probes.

Edan SD3 Ultrasonic Fetal Doppler With Alkaline Battery A reliable, no-fuss fetal Doppler for clinics that prefer standard alkaline battery power. The alkaline battery configuration means the device is always ready to use without charging cycles, making it particularly well-suited to high-throughput antenatal settings or as a backup unit. Compatible with 2 MHz and 3 MHz waterproof interchangeable probes.

Edan SD3 Ultrasonic Fetal Doppler With Rechargeable Battery The rechargeable battery variant of the SD3 fetal Doppler is designed for practices focused on reducing ongoing consumable costs and environmental impact. The built-in lithium-ion battery delivers consistent power across extended use, and the device is fully compatible with the SD3's range of 2 MHz and 3 MHz waterproof interchangeable probes.

Edan SD3 Ultrasonic Vascular Doppler With 8 MHz Probe Configured for peripheral vascular assessment, this SD3 variant comes equipped with an 8 MHz probe for high-resolution evaluation of superficial vessels — including digital arteries, pedal pulses, and other distal vascular sites. Well-suited to vascular clinics, wound care settings, and diabetes management practices where precise assessment of small peripheral vessels is required.

Edan SD3 Ultrasonic Vascular Doppler With 4 MHz Probe The 4 MHz vascular configuration of the SD3 is suited to assessment of deeper peripheral vessels, including femoral, popliteal, and brachial arteries. Its deeper penetration depth makes it a practical choice for general vascular screening, ankle-brachial index (ABI) measurement, and lower limb arterial assessments across a range of clinical body habitus.

Edan SD3 Interchangeable Probes

One of the SD3's defining strengths is its interchangeable waterproof probe system — a single device body can support multiple clinical applications simply by swapping the probe. All probes below are fully compatible with the Edan SD3 platform.

2 MHz Waterproof Interchangeable Probe (For Edan SD3 Fetal Doppler) The 2 MHz probe offers deeper tissue penetration, making it the preferred choice for fetal monitoring in patients where standard 3 MHz signal acquisition is more challenging — including higher BMI presentations or cases where the fetal position makes detection more difficult.

3 MHz Waterproof Interchangeable Probe (For Edan SD3 Fetal Doppler) The 3 MHz probe is the standard frequency for routine fetal heart rate monitoring and the most commonly used probe in antenatal clinical settings. It provides clear, reliable signal detection across the majority of prenatal assessments from approximately 12 weeks gestation onward.

4 MHz Waterproof Interchangeable Probe (For Edan SD3 Vascular Doppler) A replacement or additional 4 MHz probe for SD3 vascular configurations. Suitable for deeper peripheral arterial and venous assessment, including lower limb and upper limb vessels. Ideal for practices performing ABI measurements or general vascular screening.

8 MHz Waterproof Interchangeable Probe (For Edan SD3 Vascular Doppler) A replacement or additional 8 MHz probe for high-resolution superficial vascular work. The 8 MHz frequency delivers sharper signal resolution for distal and small-calibre vessels, making it the preferred choice for podiatric, wound care, and diabetic foot assessments.

Edan SD3 Batteries & Consumables

Edan Lithium-ion Battery for SD3 Plus & SD3 Pro Dopplers A genuine OEM replacement lithium-ion battery for the Edan SD3 Plus and SD3 Pro models. Maintaining a charged, functional battery is essential for uninterrupted clinical use — keeping a spare on hand ensures your Doppler is always ready when needed. Compatible with SD3 Plus and SD3 Pro models only; confirm your device model before ordering.

Frequently Asked Questions About the Edan SD3

What makes the Edan SD3 different from other handheld Dopplers? The SD3's key advantage is its interchangeable waterproof probe system. Most handheld Dopplers come with a fixed, integrated probe — the SD3 allows a single device to switch between fetal and vascular applications, or between probe frequencies, by simply swapping the probe head. This makes it a highly cost-effective platform for practices managing more than one clinical application.

Can the Edan SD3 be used for both fetal and vascular assessments? Yes — with the appropriate probe. Fetal probes (2 MHz and 3 MHz) are used for prenatal monitoring, while vascular probes (4 MHz and 8 MHz) are designed for peripheral arterial and venous assessment. The SD3 vascular device body with both a 4 MHz and 8 MHz probe covers a broad range of vascular indications.

What is the difference between the 4 MHz and 8 MHz vascular probes? The 4 MHz probe offers deeper tissue penetration, making it suited to larger or deeper vessels such as femoral and popliteal arteries. The 8 MHz probe operates at a higher frequency for greater resolution in superficial, small-calibre vessels — such as pedal pulses and digital arteries. Many vascular practitioners keep both probes available to cover all assessment scenarios.

What is the difference between the 2 MHz and 3 MHz fetal probes? The 3 MHz probe is the standard choice for routine fetal monitoring in most clinical presentations. The 2 MHz probe's lower frequency provides deeper penetration, which can be beneficial when detecting the fetal heartbeat in patients with higher abdominal tissue depth or when the fetal position makes signal acquisition more challenging with a 3 MHz probe.

Which SD3 battery option is best — alkaline or rechargeable? This depends on your clinical environment. Alkaline batteries offer instant availability — no charging required — making them a practical choice for busy clinics, remote or visiting services, or as a backup device. The rechargeable model reduces ongoing battery costs and is better suited to high-use settings with reliable access to charging. The lithium-ion battery replacement is compatible with SD3 Plus and SD3 Pro models only.

Are the Edan SD3 probes waterproof? Yes — all SD3 interchangeable probes are waterproof, supporting thorough cleaning and disinfection between patients in line with infection control requirements.

View the full Dopplers range or browse Doppler Accessories to complete your setup.