Power
classifications, applied parts that are not conductive and can be connected to earth. Type BF: This covers applied parts that are electrically connected to the patient. These must be floating and separated from the earth. (It doesn’t cover anything that is in direct contact with the patient heart). Type CF: This is the most stringent classification as it covers devices that are directly connected to the cardiac and intravenous systems.
A typical solution for a CF requirement would be to use a BF rated AC/DC unit then in the second stage of the electrical circuitry, you can utilise a CF rated dc/ dc converter to provide the extra safety insulation required.
Both BF and CF systems are required to supply extra isolation, to provide protection for the patient to ground.
Format choice
The other major choice is whether you want the power supply as an external source be that a plugtop unit or desktop in line unit, or one that is enclosed inside the equipment itself.
For many applications, the power level Conclusion
In brief, make sure your supply is suitable for medical applications; approved with 60601-1. For a medical in the home application, make sure it’s Class II with extra wide input voltage range to cope
required may be low and if it's for a small instrument a plugin adaptor might be a good solution. These can be supplied in white and have customer logos and details printed on the unit to identify and assist with branding. For higher power requirements however, an internal unit is usually employed. One solution we usually recommend is the MAD/MAF series from P-Duke as they meet all the safety requirements.
The MAD / MAF series of power supplies
P-Duke’s MAD/MAF series of ultra-compact units are available in a number of formats, be that open frame, in a U-Chassis or fully enclosed with an on-board fan. They cover a wide power range from 40W up to 450W and all have the 85-264V wide input range and have Class II versions available.
Pic 1: MAF300 – 300W of medical grade power – picture shows the variety of formats available
with the voltage variances and then check on the level of patient contact your equipment has. Also please remember we are very happy to assist with product
selection and our product specialists can offer technical support throughout the design cycle.
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