CMS50I-CMS50F oximeters: technical and uploading differences and limits

[2SleepBetta]

I own a now-dead 50I. Would someone please fill me in on capabilities of the 50F? Does it record perfusion index data as well as SpO2 and pulse rate data and display a "plethy", too? I think its real time finger-sensor data can be fed directly into a computer (for whatever that may be worth). Is its battery replaceable, a "cell"?

I tried but never succeeded in uploading to SleepyHead from the 50I more than that one night of oximetry data for the same--and latest--sleep session dataset uploaded from the A10's card. (SH v1.0.0-beta-2[cb213cc Open GL]). If that single latest sleep session matchup of A10 and 50I datasets is a limitation of SH, then there is no point in buying the 50I again for its 7-day storage capacity (though I did find it reassuring it would accumulate and hold up to a 7-day backup).

Also, I tried but failed to find a way to upload appropriately dated SpO2 data to have it displayed/matched with a sleep session earlier than the last session that had been uploaded from the A10's SD card. 

My 50I's battery has died after 28 months of continuous use and I doubt--but will keep looking for--a replacement that is accessible to me for the hard-wired battery it uses. A small circuit board strip is an integral part of the battery, soldered to both its poles--all tightly sealed inside a plastic film wrapper with two wires going to the "motherboard".

I think the 50I differs from the 50F in NOT being approved by the FDA for some reason. I will say its readings always agreed with oximeters of various medical providers. 

To keep it simpler, I'd appreciate it if anyone responding would simply insert their responses, possibly in a different colored font, within the body of my text.

Thanks for considering this.

2SB

[Walla Walla]

I know the CMS50F only records a single session. Looking at it I don't think the battery was made to be replaced either. It only records SpO2 and pulse rate. The finger sensor attaches a wrist device which you wear during the night. You can than download to the computer.

[Crimson Nape]

The 50F doesn't report the perfusion index, only pulse, and SpO₂  Also. the 50F will store only 1 session as opposed to the 50I's 14. (If I remember correctly)  You are correct about the 50I not being FDA approved in the U.S.  

SleepyHead's earlier version, 0.9.8.1-Testing, will import either the 50F or 50I without problems.  I have to import the ".spo2" file in SH 1.0.0- Beta-2 for it to work.  Both SleepyHead versions will not display perfusion index if imported from the spo2 file. You will have to import it directly from the 50I.

[pholynyk]

I own a now-dead 50I. Would someone please fill me in on capabilities of the 50F? Does it record perfusion index data as well as SpO2 and pulse rate data and display a "plethy", too? I think its real time finger-sensor data can be fed directly into a computer (for whatever that may be worth). Is its battery replaceable, a "cell"?

Welcome to the club. I own a now dead 50F. Apparently the OLED died. When it worked, the 50F recorded pulse rate and SpO2 only.

While the finger cuff looks like it has a miniUSB connector, close examination with a lighted magnifier revealed a set of contacts on each side of the tongue - definitely non-standard.

It uses a soldered-in LiIon or LiPoly cell with a small circuit at the top, and two leads to the board. Both the OLED and the cell are glued to the board.

I tried but never succeeded in uploading to SleepyHead from the 50I more than that one night of oximetry data for the same--and latest--sleep session dataset uploaded from the A10's card. (SH v1.0.0-beta-2[cb213cc Open GL]). If that single latest sleep session matchup of A10 and 50I datasets is a limitation of SH, then there is no point in buying the 50I again for its 7-day storage capacity (though I did find it reassuring it would accumulate and hold up to a 7-day backup).

I believe the SleepyHead direct import was designed before the 50I was released, so it's multi-day recording was not considered, and is not handled properly. There are some other problems with direct import, which I am working on, and it may be possible to fix multi session import. I don't have a 50I to work with, unfortunately.

Also, I tried but failed to find a way to upload appropriately dated SpO2 data to have it displayed/matched with a sleep session earlier than the last session that had been uploaded from the A10's SD card. 

My 50I's battery has died after 28 months of continuous use and I doubt--but will keep looking for--a replacement that is accessible to me for the hard-wired battery it uses. A small circuit board strip is an integral part of the battery, soldered to both its poles--all tightly sealed inside a plastic film wrapper with two wires going to the "motherboard".

Adafruit sells a variety of LiPoly cells, all with the protective circuit; but given the touchiness of such cells, I can't recommend substituting for an unknown cell.

I think the 50I differs from the 50F in NOT being approved by the FDA for some reason. I will say its readings always agreed with oximeters of various medical providers. 

In short, I'm not particularly happy with the Contec offerings. Although I did just purchase a 50D+.

To keep it simpler, I'd appreciate it if anyone responding would simply insert their responses, possibly in a different colored font, within the body of my text.

Thanks for considering this.

2SB

[ShaunBlake]

I know the CMS50F only records a single session. Looking at it I don't think the battery was made to be replaced either. It only records SpO2 and pulse rate. The finger sensor attaches a wrist device which you wear during the night. You can than download to the computer.

The 50F doesn't report the perfusion index, only pulse, and SpO₂  Also. the 50F will store only 1 session as opposed to the 50I's 14. (If I remember correctly)  You are correct about the 50I not being FDA approved in the U.S.  

SleepyHead's earlier version, 0.9.8.1-Testing, will import either the 50F or 50I without problems.  I have to import the ".spo2" file in SH 1.0.0- Beta-2 for it to work.  Both SleepyHead versions will not display perfusion index if imported from the spo2 file. You will have to import it directly from the 50I.

hmm... my 50F is connected to this computer right now; I hope it doesn't pay any attention to your comments (I downloaded Moanday and Chewsday data from it yestiddy moaning. Mine will store "approximately 72 hours" of data, but the most I've pushed it was 4 days.

[Walla Walla]

Not sure how you did that? When I started recording it wrote over the previous recording.

[ShaunBlake]

huh! I din' do it, it jus' did it for me. What baffles me is why it will show "Recording" when I wake up, the probe is plugged in, but nothing's recorded. Fifty dollar POS.

Mine shows "Ver  6. 0" when I boot. Can't recall where (musta been on this forum) I saw a reference to 50Fs being updated. I bought mine this year. How old is yourn?

[Walla Walla]

I bought it last year. Shows Ver 3.9 when you first turn it on. Must of updated them.

[ShaunBlake]

I wonder if it's just a flash update or some electronics changed. I saw a post by [b]pholynyk[/b] about changing batteries in the 50I. I wonder if he would know if you can update the Fs. But you may not care, having developed the routine of d'loading the data every day ensures that you don't go too long and have gaps.

[Walla Walla]

I just used it for spot checks. I doubt they bother to upgrade older versions they're cheap and made in china. Easier just to make a newer one than update it.