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Medical Wire Harness | Durable Cable Assemblies

Medical Wire Harnesses for Medical Devices

Medical wiring harnesses are bundled wire systems that transmit signals and power within diagnostic, therapeutic and surgical equipment.

Used in Class II and III devices, medical wire harnesses must meet strict biocompatibility, sterilization, and traceability requirements.

We manufacture each harness to minimize EMI, manage strain and maintain electrical continuity across all load and flex conditions.

WellPCB builds medical wire harnesses using RoHS compliant materials, high reliability wiring techniques and workmanship standards consistent with IPC/WHMA-A-620 and ISO 9001.

  • RoHS-compliant wire materials for medical-grade harness builds.
  • Biocompatible jackets and sterilization resistant insulation.
  • Electrical and visual inspection for wiring accuracy and signal continuity.

Wiring Harness Services for Medical Equipment and Devices

Medical wire harnesses organize and protect internal wiring in medical equipment, including monitoring equipment, diagnostic equipment and surgical systems.

Each harness must be able to withstand flexing, sterilization and reliable operation in clinical environments.

WellPCB manufactures custom wiring harness using RoHS-compliant materials, quality medical insulation and documented assembly methods.

Supported specifications include wire lengths up to 610 mm, strip lengths between 1 mm and 15 mm and conductor gauges from 36 to 12 AWG.

Each wire harness undergoes visual inspection to verify branch layout, label accuracy and connector placement.

Harness products are suitable for use in OEM medical devices that require precise wiring, biocompatibility and repeatable manufacturing.

Our Medical Wire Harness Capabilities

WellPCB manufactures OEM medical wire harness and medical cable assembly solutions for regulated medical equipment, delivering tested routing, labeled outputs, and connector terminations matched to device specifications.

Our custom wiring harness production ensures full traceability and regulatory compliance.

Each build uses verified medical wires and pin mappings documented for production traceability.

Signal Grade Wiring Harnesses

WellPCB manufactures signal grade medical wiring harnesses for diagnostic equipment requiring high EMI shielding and signal integrity.

Builds support stranded copper conductors in 26–20 AWG with PVC or TPE insulation, terminated into connectors using press-fit or crimp tooling.

Signal lines are shielded with aluminum-Mylar foil or 85% tinned copper braid, depending on frequency sensitivity.

Conductor pairs are twisted to reduce crosstalk in ECG, EKG, or imaging systems. Each harness is tested for continuity and insulation resistance using programmable harness testers with up to 128 test points.

Compact Sensor-to-Module Harnesses

We produce compact medical wire harnesses that bridge patient facing sensors to internal control modules in medical devices.

Conductor sizes from 36 AWG to 22 AWG are supported with strip lengths controlled to ±0.3 mm. Terminals are inserted into keyed housings such as Molex PicoBlade or JST ZH, with insertion force verified using fixture based seating tools.

Medical wire harness solutions include single and multi-branch configurations with visual indicator flags and routing tags.

All harnesses undergo pinout validation and crimp height checks using calibrated micrometers to ensure accuracy.

Surgical and Sterilizable Harnesses

WellPCB manufactures medical wire harnesses for surgical and patient-adjacent devices using biocompatible insulation materials such as SF302 silicone and TPE.

Jacket materials are rated for repeated autoclave cycles at 273 °F (134 °C) and meet ISO 9001 and IPC standards. Harnesses must retain jacket flexibility, strain relief adhesion, and printed label readability after up to 1,000 sterilization cycles.

ETO, gamma, and chemical disinfectant compatibility is validated through post-process inspection. Terminations use gold-plated or tin plated contacts to withstand chemical corrosion.

Internal Subsystem Harnesses

We assemble wire harnesses for internal subsystems, including pumps, motors, actuators, and solenoids, within medical devices.

Jacket types include abrasion resistant PVC rated to 221 °F (105 °C) and halogen free blends for use in enclosed spaces. Wire and cable routing paths are controlled using P-clips, adhesive-backed mounts or overmold boots.

Terminals support pitches from 2.54 mm to 6.35 mm and are housed in latch-lock or snap-fit connectors.

Our manufacturing capabilities include cable ID mapping, positional labeling, and mechanical retention testing to ensure the durability of our services.

Material Sourcing and Biocompatibility

WellPCB sources medical wires from UL and CSA-approved suppliers, offering insulation options that include SF302 silicone, medical grade PVC and TPE.

All jackets are compliant with RoHS, ISO 9001, and IPC/WHMA-A-620 standards for patient-contact and fluid-contact assemblies. Each biocompatible harness undergoes material batch traceability and documentation.

Jacket options range in hardness from Shore A 50 to 90, supporting flexibility in tight enclosures. Wire insulation and shielding are validated for cytotoxicity, sensitization and leachability across finished harness builds.

Strain Relief and Termination

We implement mechanical strain relief features across all WellPCB wire harness assemblies using overmolded boots, adhesive wraps, and cable clamps.

Termination processes include automated and semi-automated crimping with force monitoring and crimp height tolerances held to ±0.05 mm.

Connector retention is verified through pull testing and go/no-go engagement checks. Wire harness and cable assembly inspection includes verifying bend radius and positioning for stress relief.

Connector bodies are keyed and locked using tactile or mechanical interlock features for vibration resistance.

Low Profile and Miniature Harnesses

WellPCB builds low profile wire harnesses for handheld, portable, and embedded medical devices using ultra flexible 28 to 36 AWG conductors.

Harness products include micro-pitch terminal sets (≤2.00 mm), flat routing for tight enclosures, and bendable branch paths with a spacing of 3 mm or less.

Medical wire harnesses must pass form-fit tests using routing templates and mockups. All terminations are checked for mechanical clearance, connector mating force, and retention.

Labeling is done using etched sleeves or low profile adhesive tabs to support miniature packaging.

Prototyping and Volume Manufacturing

WellPCB supports medical harness builds from prototype development through lot-based manufacturing.

OEMs can submit cable drawings, connector specifications, and pinout tables for harness builds governed by traceability and inspection standards.

Harness or cable assembly lots are serialized with label maps, inspection logs and documented test results.

Lead times for medical wire harness prototyping begin at 2 to 3 weeks and are confirmed on a project-by-project basis.

All builds are validated through continuity, insulation resistance, and pinout verification using multipoint testers.

Why Choose WellPCB for Your Medical Wire Harness?

WellPCB produces medical wire harnesses entirely in house, from wire cutting and terminal crimping to connector mating, testing, and labeling.

By controlling every step on-site, including material sourcing and inspection, we reduce coordination delays and prevent traceability gaps. Each build is processed, verified and documented within a single facility to meet the strict reliability and regulatory demands of medical equipment OEMs.

One-Stop Wire Harness Manufacturing for Medical Equipment

WellPCB delivers full-service medical wire harness production, from sourcing medical wires and verifying pinouts to final harness and connector assembly.

This vertically integrated process eliminates vendor fragmentation and supports rapid transition from BOMs or 3D drawings to finished medical equipment builds.

The consolidated workflow preserves traceability across wire routing, connector mating, and final inspection, reducing risk during scale-up for OEMs in regulated medical environments.

Certified ISO 9001 Process Control and Assembly Workflows

WellPCB’s wire harness production operates under ISO 9001:2015-certified manufacturing systems that cover wire cutting, terminal crimping, insulation displacement, and connector mating.

Every operation is backed by traceable documentation and linked inspection points to confirm lot consistency.

These certified workflows control material tolerances, stripping lengths, and crimp force calibration across high volume wire harness assemblies used in monitoring systems and diagnostic medical devices.

RoHS-Compliant Harness Materials

We source connectors and materials through global distributors including Arrow, Mouser, and Avnet. All medical wires and jackets used in WellPCB harnesses are built from RoHS-compliant materials, including halogen free and low smoke options compatible with sterilization.

For patient-adjacent or in-contact builds, jackets can be specified to meet ISO 9001 biocompatibility standards.

High-Density Wire Routing and Miniaturized Layouts

WellPCB supports dense wire harness configurations using 36–28 AWG medical wires routed to miniature sensors and fine pitch connector interfaces. Automated cutting, crimping, and bundling maintain uniform harness geometries across lot runs.

All builds are labeled using shrink tubing or permanent ID tags and validated for spacing and bend radius compliance, ensuring compliance with the packaging demands of embedded medical equipment and diagnostic platforms.

IPC/WHMA-A-620 Assembly Standards for Medical Harness Builds

Every WellPCB wire harness is manufactured to IPC/WHMA-A-620 Class 3 standards for high-reliability medical applications.

These standards define conductor preparation, insulation stripping, crimp height tolerances, and mechanical pull testing.

In addition to workmanship criteria, all assemblies are validated for long term performance through continuity testing, insulation resistance measurements, and connector retention checks conducted after sterilization and flex cycle simulation.

These procedures confirm that each harness maintains electrical and mechanical integrity over its expected service life in medical field conditions.

Lot-Based Documentation, Compliance Records, and Retention Tracking

Each medical wire harness build is assigned a serialized lot number linked to traceable inspection records, pinout diagrams, and component sourcing logs.

Compliance documentation is archived with each project to support regulatory audits, OEM process validation, and long term serviceability requirements.

Harness records include labeling maps, test result sheets, and quality acceptance logs, which are maintained in accordance with regulated medical equipment documentation standards.

Our Medical Harness Manufacturing Process

At WellPCB, we manufacture medical wire harness assemblies using tightly controlled production steps that meet the quality systems and procedures required within the medical industry. Every process is traceable, repeatable, and designed to support OEM documentation requirements for FDA submission requirements.