However, what Iso 14971 mentions )I don't remember where right now) is that, if the abnormal use is a common medical practice, you should probably identify it as misuse, because everyone uses the device that way...
2. That approach doesn't make much sense to me because it undermines the concept of contraindications. Basically what you wrote (or referred to) means that going against a printed contraindication (=abnormal use) should be considered "a use error" simply because that contraindication is absent in other (similar) devices' IFU or simply because a lot of users use that type of device off-label.
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