Micro USB Male to Four 4.0mm Female Snap Electrode Lead Wire with Molded Strain Relief
A single compact device connector and four electrode terminations: that is the defining layout of this custom Micro USB electrode cable. It brings a Micro USB male interface to four individual 4.0mm female snap connectors, allowing compatible TENS, EMS and physiotherapy equipment to connect with snap-type electrode accessories through one cable assembly.
The molded strain-relief (SR) areas are an important part of the design. They support the transitions from the main cable to the outgoing leads, where repeated handling and cable movement need to be considered. The photographed design is a reference configuration; pin assignment, branch layout, cable material and finished dimensions are specified for the customer's equipment.
A Micro USB Connector Used as a Device-Specific Electrode Interface
The Micro USB male end provides a compact way to mate with a controller that has the corresponding socket. On this cable, the connector shape should not be confused with a general-purpose USB charging or data connection. Its contact assignment is defined by the electrotherapy device, and plugging it into unrelated USB equipment does not establish compatibility.
Before a replacement or OEM version is produced, the mating connector, orientation and wiring table should be checked against the actual controller. When the device uses another interface or requires fewer electrode terminations, a 2.5mm Mono to Dual 4.0mm Female Snap Electrode Cable offers a different two-output cable architecture.
Four Snap Connections Without Assuming Four Independent Channels
Each of the four branch ends terminates in a 4.0mm female snap for engagement with a corresponding electrode stud. This lets the electrode pads be detached from the lead wire, while the four visible terminations remain organized within the same assembly.
Four snap ends describe the physical connections, not necessarily four independently controlled outputs. Whether the device uses two stimulation pairs, shared contacts or another channel arrangement must be determined from its pinout. Snap fit also needs to be checked against the intended electrode pads: the nominal 4.0mm size alone is not enough to confirm retention and electrical contact.
For other snap-type electrode cables and matching accessories, see TENS & EMS Cables & Electrode Accessories.
Where the Molded SR Construction Matters
On a four-lead electrode cable, the breakout and connector exits are natural bending points. The molded SR sections help guide each lead away from the joint, while the selected conductor and jacket determine how the assembly behaves during routing, packing and repeated handling.
A sample review should pay attention to how the leads leave the molded section, whether the branch lengths reach their intended electrode locations without excessive pull, and whether the connector overmolds interfere with adjacent pads. These are more useful checks than relying on cable length alone.
Configuration Points for OEM Development
Device-side interface: Micro USB male, wired to the approved controller pin assignment.
Electrode terminations: Four 4.0mm female snap connectors.
Branch identification: Lead colors, markers and grouping can follow the device wiring drawing.
Strain relief: Molded SR structure at specified cable transitions and connector exits.
Cable construction: Total length, individual branch lengths, conductor size, jacket material and color selected for the project.
Documentation: Sample, pinout table, controlled drawing, labeling and packaging defined before repeat orders.
From the Mating Sample to a Repeatable Four-Lead Assembly
For a new controller project, the most useful starting materials are the Micro USB mating-socket information, channel and pinout definitions, a sample of the intended electrode pads and a sketch of where the four leads need to reach. From these, Heymed Medical can work through connector fit, SR positioning, conductor selection and branch dimensions before preparing samples.
Once a sample is approved, the agreed details become the manufacturing reference for molding, assembly, continuity inspection, lead identification and packaging. More complex interface changes can be reviewed under our Custom Medical Cable Assemblies service.
The cable should only be used with equipment and electrodes whose mechanical and electrical interfaces have been checked for the intended application.
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