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What is the status of a kli whose primary use would be forbidden on Shabbos, but it is only used in a case of Pikuach Nefesh. Is it a Kli Shemelachto LeIssur or Kli Shemelachto Leheter?

Examples:

  1. Defibrillator - it uses electricity (so it should be a kli shemelachto leissur), but the only time it's used is when someone is in a state of pikuach nefesh (so it should be a hetter). I heard that there is a machlokes if a kli shemelachto leheter can become muktza machmas chisaron kis.
  2. Gas Mask (possibly) - it could be a kli shemelachto leisssur (it could be borer, similar to a water filter). On the other hand the only time it's used is when there is a sakanas nefashos.
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Perhaps it's a kli shemelachto l'issur shaino bo heter. – Yehoshua Jan 28 at 23:18
The Machlokes whether a kli shemelachto leheter can become muktzah machmas chisron kis or not: Shulchan Aruch Harav 308:4-5 says it cannot, Chayeh Adom (Klal 65:3) seems to imply it could [see also Mishna Berura 308:8]. – Michoel Jan 29 at 4:48
@Michoel so if you pasken like the A"R you have a huge nafka mina. Is a defibrillator muktza machmas chisaron kis (and can't move it at all) or is it a Kli shemelachto lehetter. – Shmuel Brin Jan 29 at 4:51

1 Answer

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If I recall correctly the Nishmas Avraham says that a stethoscope is not muktzeh. (Citation needed.)

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2  
How would that be Melachto LeIsur? – Seth J Jan 29 at 17:43
@SethJ השמעת קול? :) – Double AA♦ Jan 31 at 22:47

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