Comparison between internal harness and external cable assembly
2026-10-19
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Internal harnesses and external cable assemblies are two major wiring solutions for medical electronic devices such as patient monitors.
Significant distinctions exist between them regarding installation position, mechanical load, material requirements and regulatory compliance.
The comparative information is listed in Table 1.
Table 1 Comparison between internal harness and external cable assembly
| Items | Internal Harness | External Cable Assembly |
|---|---|---|
| Installation Location | Inside equipment housing, enclosed | Outside device casing, exposed to users |
| Main Function | Fixed connection between internal PCBs & components | Connect main unit to external probes (SpO₂, ECG, temperature sensors) |
| Mechanical Requirements | Low repeated bending & tensile load; fixed routing | High flex resistance, tensile strength and abrasion resistance; frequent bending and pulling |
| Material & Structure | Fine electronic wires, terminals, heat shrink tube; no heavy outer jacket | Complete outer sheath, molded strain relief (SR); medical-grade materials for skin contact parts |
| Key Compliance Requirements | Basic electrical insulation safety | IEC 60601, IEC 60601-1-2 EMC, ISO 10993 biocompatibility, ISO 13485, CE if for export |
| Typical Application | Internal wiring of monitor mainboard | SpO2 cable, ECG lead wire, temperature probe cable |
Internal harnesses work in a protected environment inside the enclosure. Their design priority focuses on stable electrical transmission and space-saving layout. External cable assemblies are operated by end users directly. They need to withstand continuous mechanical stress, and medical-grade external cables must satisfy strict biocompatibility and medical electrical safety standards.
Proper selection of harness type and strict compliance with corresponding specifications are essential to ensure the safety, durability and long-term reliability of medical devices.
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