1. Introduction
The YONKER Fetal Doppler YK 90 B is a portable device designed to detect and monitor fetal heart rate. It allows expectant parents to listen to their baby's heartbeat from approximately the 16th week of pregnancy. This device features an integrated transducer, an LCD display for heart rate readings, and a built-in speaker for clear audio output. Please read this manual thoroughly before use to ensure safe and effective operation.
Image 1.1: The YONKER Fetal Doppler YK 90 B main unit, showing the integrated transducer, LCD display, and control buttons.
2. Safety Information
- This device is intended for home use and should not replace regular medical examinations by a healthcare professional.
- Consult your doctor if you have any concerns about your pregnancy or the fetal heart rate readings.
- Do not use the device for prolonged periods. Limit sessions to a few minutes.
- Keep the device out of reach of children.
- Use only the recommended coupling gel. Do not use other substances that may damage the transducer.
- Do not immerse the device in water or other liquids.
3. Package Contents
Upon opening the package, please verify that all components are present and undamaged:
- YONKER Fetal Doppler YK 90 B Main Unit
- Integrated 2.0 MHz Transducer
- User Manual (this document)
- Coupling Gel (may be included depending on package)
Image 3.1: The YONKER Fetal Doppler YK 90 B and its user manual within the retail packaging.
4. Device Components
Familiarize yourself with the different parts of your Fetal Doppler YK 90 B:
- Main Unit: Contains the LCD display, control buttons, and speaker.
- LCD Display: Shows the fetal heart rate (BPM) and battery status.
- Power Button: Turns the device on and off.
- Volume Buttons: Adjusts the audio output level.
- Integrated Transducer: Emits and receives ultrasound waves to detect the fetal heartbeat.
- Speaker: Outputs the audible fetal heartbeat sound.
- Battery Compartment: Located on the back of the main unit.
Image 4.1: Various angles of the YONKER Fetal Doppler YK 90 B, highlighting the battery compartment and overall design.
5. Setup
5.1 Battery Installation
- Locate the battery compartment cover on the back of the main unit.
- Gently slide or lift the cover to open the compartment.
- Insert the required batteries (typically AA or AAA, check the compartment for markings) ensuring correct polarity (+/-).
- Replace the battery compartment cover securely.
5.2 Powering On/Off
- To turn on the device, press and hold the Power button until the LCD display illuminates.
- To turn off the device, press and hold the Power button again until the display turns off.
6. Operation
6.1 Preparing for Use
- Ensure the device has fresh batteries installed.
- Apply a small amount of coupling gel to your lower abdomen, or directly onto the transducer surface. The gel is essential for good signal transmission.
- Lie down in a comfortable position.
6.2 Finding the Fetal Heartbeat
- Turn on the Fetal Doppler.
- Place the transducer flat against your skin, over the area where you expect to find the heartbeat. For pregnancies around 16-20 weeks, this is typically low on the abdomen, just above the pubic bone.
- Slowly and gently move the transducer across your abdomen, applying light pressure. Listen carefully for a fast, galloping sound, which indicates the fetal heartbeat.
- Adjust the volume using the volume buttons as needed.
- Once the heartbeat is detected, hold the transducer steady to get a stable reading on the LCD display. The display will show the fetal heart rate in beats per minute (BPM).
6.3 Interpreting Readings
A normal fetal heart rate typically ranges between 120 and 160 BPM. Variations can occur. If you have any concerns about the heart rate detected, or if you cannot find a heartbeat, contact your healthcare provider.
7. Maintenance and Storage
7.1 Cleaning
- After each use, wipe any remaining coupling gel from the transducer and your skin with a soft, dry cloth or tissue.
- Clean the main unit and transducer with a soft, damp cloth. Do not use abrasive cleaners, alcohol, or solvents.
- Ensure the device is completely dry before storing.
7.2 Storage
- Store the Fetal Doppler in a cool, dry place, away from direct sunlight and extreme temperatures.
- If the device will not be used for an extended period, remove the batteries to prevent leakage and damage.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound or weak sound | Low volume setting, insufficient gel, incorrect transducer placement, low batteries. | Increase volume, apply more gel, reposition transducer, replace batteries. |
| No heart rate displayed | Insufficient gel, incorrect transducer placement, too early in pregnancy, device malfunction. | Apply more gel, reposition transducer, ensure you are past 16 weeks of pregnancy. If problem persists, contact support. |
| Device does not turn on | Dead or incorrectly installed batteries. | Replace batteries with new ones, ensuring correct polarity. |
If you experience issues not listed here or if troubleshooting steps do not resolve the problem, please contact customer support.
9. Specifications
| Feature | Detail |
|---|---|
| Model | YK 90 B |
| Brand | Yonker |
| Transducer Frequency | 2.0 MHz |
| Display | LCD |
| Integrated Speaker | Yes |
| ASIN | B087C6F84C |
| First Available Date | March 6, 2021 |
10. Warranty and Support
Your YONKER Fetal Doppler YK 90 B is backed by a warranty provided by Adalu Ingeniería S.A. de C.V. This includes a One-to-One Warranty, meaning if the equipment fails, it will be replaced at no additional cost. This warranty is valid exclusively for purchases made through Adalu Ingeniería S.A. de C.V.
For warranty claims, technical support, or any inquiries regarding your device, please contact Adalu Ingeniería S.A. de C.V. directly. Their contact information can typically be found on your purchase receipt or the seller's page on the platform where the product was acquired.
Image 10.1: Information regarding the authorized distributor and warranty details for Yonker products.