Hello Dan, Dont you think that (irrespective of the warning ) the magnet on the DC cord is *much* weaker than a magnet used to penetrate through the thickness of the human body and then trigger the reed switches? My first thought is that the warning is there as a CYA? Perhaps?
On Sun, Nov 6, 2022 at 2:06 PM Dan Roman < 00000d75e04ed751-dmarc-requ...@listserv.ieee.org> wrote: > * This message originated outside of DISH and was sent by: > 00000d75e04ed751-dmarc-requ...@listserv.ieee.org > <00000d75e04ed751-dmarc-requ...@listserv.ieee.org> * > ------------------------------ > > Thank you everyone for the responses. Contacting the customer support > number gets you to someone who basically reads back what is on the website > and the user manual, so it was not particularly helpful when trying to get > to the specifics. > > > > In a roundabout way through a friend of a friend I managed to arrange a > phone call with someone from Boston Scientific that had technical > engineering knowledge and could answer my questions. The device in > question is a pacemaker/defibrillator. It happens to be MRI compatible but > I didn’t get into what that means with respect to magnetic fields, I think > it probably has a lot to do with not getting ripped out of your chest if > you get an MRI. > > > > Anyway, it has two sets of reed switches embedded in it. One reed switch > will react to a lower level magnet placed over it and that puts it into a > fixed pacing mode. This is used for diagnosing in the doctor’s office. > The magnet in a fitness tracker is not likely to be strong enough or to get > close enough to turn on the fixed pacing mode during normal wear, but they > still will tell you not to wear it to bed in case you contort in such a way > when sleeping to cause an issue. > > > > The second reed switch reacts only to a much stronger magnetic field and > this is used to disable the defibrillator if you go in for an operation. > The anesthesiologist will apply a strong magnet over the device to disable > it for the duration of the operation. Makes sense that as that is easier > than connecting up a programming device to disable it and then re-enable it > and it can be easily turned off in an emergency situation with no need for > a make/model specific programming set. > > > > So the relative is going to keep the fitness tracker and not wear it to > bed (most of the time). They lose the sleep tracking but that is not of as > much interest to them and they don’t have it when sleeping every few days > to charge it overnight anyway. > > > > Not sure if all devices work the same way but sounds like for > simplification reasons this might be a standardized practice to make > surgeon’s and other health care work easier. > > > > I should have asked about how “MRI compatible” works! Now I’m curious. > > > > Dan > > > > > > *From:* MIKE SHERMAN [mailto:msherma...@comcast.net] > *Sent:* Thursday, November 03, 2022 8:52 PM > *To:* EMC-PSTC@LISTSERV.IEEE.ORG > *Subject:* Re: [PSES] Magnetic fields, human exposure standards, and > pacemakers > > > > Dan -- > > > > I'd suggest that you have your relative call Support at the > pacemaker/defib manufacturer. On a slightly different project, I found a > lot of on-line information about device immunity, and I think we even > called Support and got additional clarifying information. Go to the source! > > Mike Sherman > > Sherman PSC LLC > > Product Safety and Compliance Consulting > > On 11/03/2022 11:32 AM Dan Roman < > 00000d75e04ed751-dmarc-requ...@listserv.ieee.org> wrote: > > > > > > Hello list! > > > > I have a relative with an implanted pacemaker/defibrillator who recently > got a fitness tracker that has a magnet for attachment/alignment of the > charging cord. There are warnings in the user manual advising against > people with pacemakers using this product because of the magnets, which I > assume are fairly strong rare earth types. I looked up the DoC for the > tracker and the EM field human exposure standards EN 50663 and EN 62479 are > listed on the DoC. My question is do these standards and the similar IEC > 62233 give a reasonable assurance that a pacemaker would not be interfered > with or are these standards purely concerned with biological effects on the > human body only? I would expect the pacemaker to be immune to a certain > extent if it is FDA listed and complies with IEC 60601-1-2. I don’t know > the model number of their device but I would expect them all to be > similar. Do they need to send back their fitness tracker? Or is the > warning just thrown in because the lawyers wanted it? > > > > Although products I work on need to meet these types of standards, I don’t > have much familiarity with these exposure standards because my products > have never failed > > > > Regards, > > > > Dan > > > > ______________________________________________________ > Dan Roman, N.C.E. > > Senior Member > > IEEE Product Safety Engineering Society > > mailto:dan.ro...@ieee.org <dan.ro...@ieee.org> > > > > > > > > > > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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To post a message to the list, send your e-mail to < > emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > <http://www.ieee-pses.org/emc-pstc.html> > > Website: http://www.ieee-pses.org/ > <http://www.ieee-pses.org/> > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > <http://www.ieee-pses.org/listrules.html> > > For help, send mail to the list administrators: > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > ------------------------------ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to < > emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > <http://www.ieee-pses.org/emc-pstc.html> > > Website: http://www.ieee-pses.org/ > <http://www.ieee-pses.org/> > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > <http://www.ieee-pses.org/listrules.html> > > For help, send mail to the list administrators: > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > ------------------------------ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> > -- Charles Grasso Dish Technologies (c) 303-204-2974 (w) 303-706-5467 (h) 303-317-5530 (e ) charles.gra...@dish.com (e2) chasgra...@gmail.com - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
