Electrical equipment is becoming more common in clinical Settings. Electricity plays a vital role in improving treatment outcomes and saving lives, but the use of medical devices can carry risks. Medical power supplies require low leakage currents and have strict guidelines.The leakage current limit of medical equipment is significantly lower than that of non-medical equipment. This is a security measure to protect the medical team and patients. In many parts of a hospital or medical facility, patients and staff are exposed to electrical currents, which can be fatal.

    The leakage current can pass directly through the skin (this is called a macro shock) or through a device, supply, or device (such as a pacemaker or catheter) (this is called a micro-shock). Electric shocks are especially dangerous for patients being treated in hospitals, where they may be more vulnerable.

   Applied Parts: Parts or devices that physically touch the patient or that the patient needs to touch, such as probes, electrocardiograms, operating tables, etc., for general use. It is usually used in medical electrical  equipment that is in direct contact with patients.  

According to the electrode protection law, it is divided into three types

• Type CF: This is the most stringent category, where touch parts can be directly connected to the cardiovascular system.

• Type BF: The leakage current requirement is less stringent than Type CF, and this type of contact part can be connected to the patient's body and allows connection to the patient with other contact parts.

• Type B: The minimum required contact part, this contact part can be connected to the patient's body, but no other contact part is allowed to be connected to the patient.
  

   

  According to the requirements of the regulations, the three types of system leakage current requirements are as follows:

NC=Normal Conditions / SFC=Single Fault Conditions

The above is defined for medical system equipment, in actual use, usually medical power will not directly contact the human body, so the medical power supply itself does not need to meet the specification of touch parts, but the final product system still needs to be further evaluated and confirmed according to the component category (B/BF/CF).

The leakage current of the medical power supply comes from the parasitic capacitance of the transformer itself and the Y capacitance required to comply with EMC specifications. In order for the terminal medical electrical system in direct contact with the patient to meet the required "touch part" category, the power adapter must also meet the leakage current requirements. With many years of experience in medical power supply design, UE Power Supply can provide you with cost-effective, reliable and reliable medical power supply solutions that meet the requirements of system leakage current.