Hi Matthew,
Seem that your interpretation is correct. You need 2-25.
2-27 is for monitoring units. If your device do this (for all biological 
signals specified in your message) you can use this standard.
2-25 consists on the previous 2-25 + 2-51 (which was for interpretation of 
ECG). Especially, if your product is a SW for processing the records of the 
specified biological signals (collected by other parts of the system) for ECG 
signals you need to use 2-25. For the other signals your SW need to treated as 
a whole in the Risk Management File of the system and for all system need to be 
validated and for the life cycle apply IEC 62304.
I hope that the above can help.

Best Regards and Be Safe,
Steli


Steli Loznen, M.Sc., SM-IEEE
VP for Technical Activities and Member of BoG IEEE-PSES
Convener IEC 62A/MT29+MT 62354
17-3 Shaul HaMelech Blvd.
Tel Aviv 6436719
Israel
Tel:+972-3-6912668
Fax:+972-3-6913988
Mobile:+972-54-4818816
e-mail: [email protected]

From: Matthew D. Varas <[email protected]>
Sent: Friday, October 30, 2020 9:27 PM
To: [email protected]
Subject: [PSES] 60601 Electrocardiographs

Hello,

I am a bit confused about the 60601 particular standard for one of our devices. 
The previous version of the device had been designed to EC13 back in the stone 
age and it is being fully redesigned.

My confusion is determining which particular is more appropriate, 60601-2-25 or 
60601-2-27. The device in question is part of a system records heart rate, 
blood pressure, and some other parameters and records them in our software. 
These recordings are analyzed by the software, compared against normative data, 
and presented to the physician so they can make a diagnosis. We own -2-27 but 
not -2-25. Reading through -2-27 it feels like it is targeted more toward 
monitors that would be used in a life-sustaining scenario whereas the abstract 
for -2-25 specifically mentions "for the production of electrocardiogram 
reports for diagnostic purposes." I interpret this to mean that -2-25 is the 
correct particular standard to use for our device.

Is my thinking correct? If not, can someone help me understand the differences 
between the two?

Thank you,

Matthew Varas
Electrical Engineer
WR Medical Electronics Co
1700 Gervais Avenue | Maplewood, MN 55109 | U.S.A.
Office: 651.604.8473
[email protected]<mailto:[email protected]>

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