[Avodah] life donation

[Rich, Joel]

http://muqata.blogspot.com/2012/02/donate-year-of-your-life-for-r-elyashiv.html
are there halachic parameters for this?   i assume there is no chiyuv to donate
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There's literature on giving up your life for a greater person - seems to start with sefer chassidim 698 and a r' akiva/ reuvain ben itztrolibi which I can not trace any earlier.  If anyone has earlier cite, let me know please.
The whole rshut/chiyuv/recommended question is fascinating.
KT
Joel Rich
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