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What Are Electromagnetic Micro-Coils?

What Are Electromagnetic Micro-Coils?

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Electromagnetic micro-coils are very tiny coils that build interaction between the electric current and the magnetic field. The making of micro-coils engages the winding of an electrically conductive wire in the shape of a helix, spiral, or coil. Nevertheless, the manufacturers determine the shapes and dimensions of the electromagnetic micro-coils based on the purpose of use. There are also multiple parameters including inductance, magnetic field strength, and resistance that impact the shape and size of the coils. A magnifying glass or microscope is essential for the coil manufacturing process because of the tiny size of the coils.

Electromagnetic micro-coils are the necessary elements of multiple devices including sensor coils, inductors, electromagnets, and transformers due to their ability to build interaction between the electric current and the magnetic field. This interaction occurs either as a result of the generation of a magnetic field by the flow of an electric current or as a result of the generation of an electric current by the involvement of an external magnetic field.

Micro-Coil Size Constraints:

There are numerous invasive medical devices where micro-coils are necessary. Fitting the micro-coils into these tiny devices is the most substantial challenge for the manufacturers. Conversely, there is a huge demand for tiny components like sensors and transducers. Therefore, for the production of very small-sized micro-coils, manufacturers need to have advanced micro-motion positioning and controlling technologies.

Manufacturing Challenges:

For the micro-coil winding process, manufacturers require ultra-fine wires of eight to nine microns in diameter. Working with these tiny wires is a great challenge for the manufacturers. The most challenging job is to build a connection between these wires and for that, custom methods and equipment are necessary.

The Connectivity Solution:

Although there are some traditional methods for connecting two wires, no method is reliable when it comes to tiny ultra-fine wires. Most manufacturers of this time utilize thermo-pressure bonding technology for the connectivity solution of the ultra-fine wires. This technology is effective to provide connectivity between both similar and dissimilar wires. You can use this technology to build a connection between an ultra-fine wire with another ten times wilder wire. This technology also helps to eliminate corrosion and strain at the joints and offers the most reliable and durable connections.

Additional Resource: What Is the Difference Between a Magnetometer, Gaussmeter, and Teslameter?

The Coil Winding Method:

The coil winding procedure is the core of the production of electromagnetic micro-coils. During this process, the job of a manufacturer is to turn the ultra-fine wires around a pin or core by using custom machinery. It is always important to maintain the tight tolerance requirements and the standard of the micro-coils.


There are limitless applications of electromagnetic micro-coils. For instance, to build the navigation and orientation sensors for multiple operations including highly accurate ablations, implanted markers, stent positioning, targeted drug delivery, targeted radiation catheters, and endoscopic manipulation. For the development of active implants including pain management devices and pacemakers, micro-coils are essential. Electromagnetic micro-coils are also competent for diagnostics, dental and orthopedic treatments, and therapeutic applications. In particular, micro-coils can also create new possibilities for future applications.

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