Deactivated Bone Growth Stimulator

I have a CMF bone growth stimulator that no longer works. These devices are set to die after so many uses. Does anyone have any ideas on how to reactivate these units? Or, hacking these things for another purpose?

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TrentK94 months ago

I just did this 12/6/16 - Simply removed all 4 screws opened unit. The battery is in fact connected to two different metal pieces, I just lifted up on it with a screw driver (under the battery but NOT under the metal piece connecting to the main board. It just popped off with a little pressure. It did not FULLY reset for me though, at first I could not use it at all. Now I have 160 uses left out of 238. I believe disconnecting the battery simply reset the "9 month then dead issue", but did not fully reset the previous uses. Thank OP for this thread it saved me a headache and made me some money, I picked up a size 2 and a size 3 OL1000 "DONJOY BRAND" for $7 at a garage sale...Look out Ebay hehehehe

abmorse1 TrentK92 months ago

Hey Trent - I picked up a Donjoy OL1000 too, but I'm not having luck with the reset. It sounds like you didn't have success at first; what finally got it to work?

JonB1021 year ago

if you remove the four screws on the control unit, you will see a battery spot welded into a holder. That battery holds the clock data and counters. I broke the bottom weld loose with a thin blade. Once disconnected, it forgot that 270 days had gone by. Seems to be working now. The timer is counting down.

forrie JonB1021 year ago

We may have different units. However, I opened mine and attached a couple of photos here, where you can see the battery connector; as well, the CMOS/disc battery to the left. From your description, it's not clear this applies here. Could you comment? Thanks!

p51aviator forrie5 months ago

Thanks for posting this! Rather than cutting anything, I separated the battery from the board with a soldering iron and the pin connected to the negative side of the battery. I soldered it back in place a minute later and it worked perfectly.

JamesH327 forrie12 months ago

All I did was separate the battery from it's hosting using a small screw driver. Reset the unit just fine. Now it may expire in 270 but it will be sold long before that.

JonB102 forrie1 year ago
That is how mine looks. The battery with "129E" on it is the culprit.

With very sharp cutters, if you can clip it free, you will reset the time clock to Day 1. As long as it stays disconnected, it doesn't run up the clock. It does still count the number of times used, though.
forrie JonB1021 year ago

So if we disconnect this battery and it can't track the time, but can still count number of times used, it sounds like there may still be a problem using the unit beyond X uses. This suggests it has NVRAM somewhere that is holding this figure.

JonB102 forrie1 year ago

yes, there must be an NVRAM somewhere. What I don't know is if it will reset at 127 or quit. Only time will tell on that.

174, not 127

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