At Bobinados Osés, we are a custom common mode choke manufacturer specialising in the design and manufacture of electromagnetic solutions for OEMs in the healthcare sector.
We develop personalised inductive components for medical equipment, diagnostic systems, electromedical devices and life-support platforms that require high levels of safety and reliability.
Our experience allows us to be involved from the engineering phase through to series production. We design solutions adapted to each application to meet the electromagnetic compatibility, industrial traceability and electrical safety requirements demanded by the medical industry.
Are you developing a new piece of healthcare equipment? Contact our technical team and we'll assess the best solution for your project.
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What is a common mode choke
A common mode choke for medical devices is an electromagnetic component designed to block high-frequency currents, reduce interference and improve the electromagnetic compatibility of sensitive electronic systems. Depending on the application, it can also be referred to as a drain coil or filter inductor.
Its main function is to limit the spread of electromagnetic noise without generating additional leakage currents that could compromise patient safety. For this reason, it has become an essential element in numerous medical systems and demanding electronic equipment.
| Field of application | Name | Function |
|---|---|---|
| Electromedicine | Drain coil | Protection of sensitive circuits |
| Electromagnetic compatibility | Common mode choke | EMI interference suppression |
| Industrial electronics | Filter inductor | Control of electrical disturbances |
As a custom common mode choke manufacturer, we develop solutions adapted to the electrical, mechanical and regulatory requirements of each project. This ability to customize optimises equipment performance and improves EMC behaviour from the earliest design stages.
Our solutions also help protect sensitive circuits, increase operational stability and reinforce patient safety in critical applications.
The medical design challenge: filtering noise without exceeding leakage current
Las fuentes de alimentación conmutadas utilizadas en equipos médicos generan ruido electromagnético de alta frecuencia. Este fenómeno puede afectar al funcionamiento de sistemas electrónicos sensibles y dificultar el cumplimiento de los requisitos EMC.
Switch-mode power supplies used in medical equipment generate high-frequency electromagnetic noise. This can affect the operation of sensitive electronic systems and make it harder to meet EMC requirements.
The problem becomes especially complex in N+1 redundant power systems used in operating theatres, intensive care units and life-support platforms. In these applications, several power supplies combined can push leakage currents close to the limits set by IEC 60601-1.
Custom common mode chokes solve this design paradox. These components block electromagnetic noise without diverting current towards the patient, helping to meet electromagnetic compatibility requirements and medical safety limits at the same time.
As a common mode choke for medical devices, our components are developed alongside engineering departments to build optimised filtering architectures. Each design is adapted to the operating frequency, available space and the specific requirements of the application.
Our custom chokes also reduce reliance on inefficient standard solutions in advanced healthcare applications, helping to achieve higher levels of performance and safety.
Need to improve the electromagnetic compatibility of your medical equipment? Send us your project specifications and we'll carry out a personalised technical analysis.
Redundant medical power systems (N+1)
Redundant systems guarantee operational continuity in applications where downtime isn't acceptable. In these environments, a common mode choke for medical devices helps reduce common-mode noise and keep leakage current within the limits required by regulation.
These chokes help improve system operational stability and simplify EMC validation processes. Their use is especially relevant in equipment intended for intensive care and other critical applications.
RF cable traps in MRI systems
MRI scanners generate high-intensity electromagnetic fields. These fields can induce unwanted currents in certain conductive elements.
Chokes used in RF cable traps help prevent localised heating and reduce the risk of patient burns. As a custom common mode choke manufacturer, we develop personalised solutions adapted to the specific characteristics of each MRI system.
High-sensitivity monitoring and diagnostic equipment
Clinical monitoring and diagnostic equipment works with extremely sensitive signals. A small interference can affect measurement quality and compromise the accuracy of results.
A common mode choke for medical devices helps reduce electrical disturbance and improve signal stability. Our custom chokes also help optimise the performance of monitoring, diagnostic and biomedical instrumentation systems.
Added value: we deliver the complete electromechanical subassembly
At Bobinados Osés, we don't just supply the component. As a custom common mode choke manufacturer, we deliver complete electromechanical subassemblies ready to integrate into production.
Our supplies can include:
- Common mode choke
- Drain coil
- EMI-shielded wiring
- Sealed connectors
- Specialised soldering
- Traceability laser marking
- Electrical and dimensional verification
This approach reduces assembly times, avoids errors during integration and simplifies supplier management.
Our local manufacturing in Navarra also brings advantages that medical OEMs particularly value:
- Fast prototype development
- Flexibility for design changes
- Short and long production runs
- Less logistical dependency
- Full traceability for regulatory audits
As a filter inductor manufacturer, we deliver solutions ready to validate, certify and integrate into the final product. Our expertise in electromagnetic design lets us optimise both electrical performance and mechanical integration.
Electromagnetic solutions for medical technology manufacturers
Common mode chokes are part of a wider range of electromagnetic solutions used in advanced medical applications.
Beyond acting as a custom common mode choke manufacturer, we develop electromagnets, solenoids, electromagnetic actuators and custom electromechanical assemblies for medical technology manufacturers.
Our experience in electromagnetic filtering for medical equipment allows us to work on projects where safety, operational stability and reliability are critical factors. We design specific electromagnetic filtering solutions for medical equipment aimed at reducing interference and improving EMC compatibility.
As a common mode choke for medical devices supplier, we take part in projects where regulatory compliance and electromagnetic performance are decisive for product certification.
As a filter inductor manufacturer, we also develop components adapted to particularly demanding electrical and regulatory requirements, guaranteeing efficient integration into next-generation medical devices.
Frequently asked questions about common mode chokes
What is a common mode choke and what is it used for?
A common mode choke for medical devices is an inductive component designed to block electromagnetic noise, improve electromagnetic compatibility and protect sensitive electronic circuits.
What's the difference between a common mode choke and a Y-capacitor?
Y-capacitors divert interference to ground. Common mode chokes block electromagnetic disturbances without significantly increasing leakage current.
What advantage does a nanocrystalline core offer over ferrite?
Nanocrystalline cores offer high magnetic permeability and excellent common-mode noise suppression in demanding applications.
Why are common mode chokes critical in medical equipment?
Because they help meet EMC requirements and IEC 60601-1 leakage current limits at the same time. This improves patient safety and system reliability.
Looking for a custom common mode choke manufacturer for your next project?
If you're looking for a manufacturer able to develop fully personalised solutions for medical applications, Bobinados Osés has a team specialised in electromagnetism, industrial manufacturing and custom design ready to help.
