Power Connectors for Pulse Oximeters
Functional Overview
Pulse oximeters are essential portable medical devices used to monitor blood oxygen saturation (SpO₂) and pulse rate. They require low power, highly stable continuous power supply, compact size, and low leakage current.
Power Connector Technical Requirements
| Item | Parameter / Requirement |
| Power Range | 1W ~ 5W |
| Voltage Output | 3.3V or 5V (common) |
| Current Requirement | Typically 100mA ~ 500mA |
| Power Supply Mode | Built-in battery + external USB charging / DC input |
| Leakage Current | ≤ 10μA, compliant with IEC 60601-1 medical safety standard |
| Mating Durability | ≥ 5,000 cycles |
| EMC Performance | High; to avoid interference with sensitive signal readings |
Recommended Connector Types
| Connector Type | Example Series | Description |
| Micro USB / USB-C | Standard USB | Common for charging/data, user-friendly, widely supported |
| JST PH / XH Series | 2.0mm / 2.54mm pitch | Low-current power delivery, reliable, compact |
| Molex PicoBlade | 1.25mm pitch | Ultra-compact, ideal for tight internal spaces |
| FPC/FFC Connectors | Flat flexible cable connectors | Space-saving, used in ultra-thin pulse oximeters |
| φ3.5mm DC Plug | Miniature DC barrel | Used for external power input in tabletop models |
Selection Recommendations
- - Choose connectors compliant with IEC 60601-1 medical safety standards
- - Use housing materials with UL94 V-0 flame retardancy and high temperature resistance
- - If patient contact is involved, materials should meet ISO 10993 biocompatibility standards
- - For portable devices, use low-profile, anti-vibration, and anti-misplug connectors
- - Consider IP-rated (dust/water-resistant) designs for enhanced durability in various environments