This is one of the statements you can find in the ANSI/AAMI/ISO TIR14969:2004 (guidance towards ISO 13485) document about the two terms:
18.104.22.168 For medical devices, an understanding of both stated intended use
and any reasonably foreseeable misuse, and indications for use
, should be documented. This is of particular importance in the development of new products. The guidance in 7.3 will help the organization to determine if requirements for design and development apply. The stated intended use
and any reasonably foreseeable misuse should also be included in risk management activities (see 7.1 of this document regarding risk management activities).
I see this statement contrasting the "intended use" with "foreseeable misuse". "Indications for use" is more of the specific scenarios in which the device may be applied.
I also agree with the previous log that stated to be careful with your application remarks. If you aren't a RAPS member, you may want to check with RAPS.org about this subject. Anywhere you state what your product does is a "labelling" that is FDA reviewable and peer-debatable.
If you stray from your 510(k) permissable indications, you will have regulatory work to do beyond any labelling changes.
Hope this helps!