New LL Nail Design - Optimized

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Quote from: nvafee on July 17, 2025, 11:57:54 PMLeg lengthening nails are not used solely for cosmetic purposes. In certain medical conditions, such as limb length discrepancies, lengthening of over 10 cm may be required.
I’m aware of cases where a shortened tibia has been lengthened by as much as 18 cm.

Of course, but this is a different story and usually covered by medical insurance. And, anyways, this type of discrepancy over-lengthening asks for big time gap between lengthening phases.
So, thats why, we are interested to talk strictly about LL, because here the prices are imense and we need a cheap and strong nail... and also safe, not unlimited lengthening.

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Quote from: Ted68 on July 22, 2025, 11:04:57 AMOf course, but this is a different story and usually covered by medical insurance. And, anyways, this type of discrepancy over-lengthening asks for big time gap between lengthening phases.
So, thats why, we are interested to talk strictly about LL, because here the prices are imense and we need a cheap and strong nail... and also safe, not unlimited lengthening.
Of course, I will review each country’s regulations when setting these limits. Doctors will also provide guidance on maximum lengthening. Individual tolerance varies—regular athletes may safely handle greater length, so it wouldn’t be fair to impose a one‑size‑fits‑all restriction. However, I understand that in some countries, like the U.S., if I allow a high limit, some patients might ignore medical advice and push the device to its maximum, beyond their capabilities., potentially causing complications and legal issues. Therefore, I may implement different device limits for different countries.

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One thing I forgot to mention, that I think is kind of relevant, is that if possible, you should try to make a smaller nail size, like a 8, 9, or 10 mm nail option. In my case and for some others potiential patients, we can't use precice nails such as 10,7 mm or 12 mm, fitbone or any of the albazzia nails, because of the size of the nail is too big for our small bones. Sure we can go with Precice nail 8.X mm but that nail is not recommended for CLL, since it statistically breaks very often even without misuse. Both dr Donghoon Lee and Mustafa Uysal has stopped using it for CLL at all, since it's so unstable and barely can handle any weight even by tiny people.

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Quote from: DanishViking on July 24, 2025, 07:24:37 AMOne thing I forgot to mention, that I think is kind of relevant, is that if possible, you should try to make a smaller nail size, like a 8, 9, or 10 mm nail option. In my case and for some others potiential patients, we can't use precice nails such as 10,7 mm or 12 mm, fitbone or any of the albazzia nails, because of the size of the nail is too big for our small bones. Sure we can go with Precice nail 8.X mm but that nail is not recommended for CLL, since it statistically breaks very often even without misuse. Both dr Donghoon Lee and Mustafa Uysal has stopped using it for CLL at all, since it's so unstable and barely can handle any weight even by tiny people.
I am designing with a 10 mm diameter, which can be reduced for arm lengthening. However, at this smaller size for the leg, it is only suitable for individuals weighing under 45 kg. People with small bones also face higher risks of fracture, osteoporosis, and delayed healing after injury in daily life. During leg lengthening, the likelihood of these complications increases, so I believe doctors will carefully evaluate such cases. I recommend that anyone in this category undergo a year of intensive physical training before proceeding with surgery.

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There's no point making a 10mm nail, there's no gap in demand or in the market for it. With Precice Max, weight bearing won't be an issue this time next year.

You should focus on 8-9.5mm range where a lot of patients are rejected or have difficult times with existing nails as they're not suitable. This would create demand for your nail. At the moment there is no weight bearing nail for this range, if you could even fix this 1 problem, your nail would be a big success.

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Quote from: GrowTow on July 24, 2025, 03:10:35 PMThere's no point making a 10mm nail, there's no gap in demand or in the market for it. With Precice Max, weight bearing won't be an issue this time next year.

You should focus on 8-9.5mm range where a lot of patients are rejected or have difficult times with existing nails as they're not suitable. This would create demand for your nail. At the moment there is no weight bearing nail for this range, if you could even fix this 1 problem, your nail would be a big success.
Have you ever undergone leg lengthening?
If you were to lengthen your legs, would you choose the LON method or Precice?
If you choose LON, what would be your reasons?

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Quote from: mariodevn on July 24, 2025, 03:22:02 PMHave you ever undergone leg lengthening?
If you were to lengthen your legs, would you choose the LON method or Precice?
If you choose LON, what would be your reasons?

I already did LON on tibias, doing LON on femurs in a couple months.

PRECICE was not a choice for me as my bones are too small.

If my bones were big enough, i'd do PRECICE 10.7+

If my only option was PRECICE 8.5mm then I would still choose LON.

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Quote from: GrowTow on July 24, 2025, 03:24:44 PMI already did LON on tibias, doing LON on femurs in a couple months.

PRECICE was not a choice for me as my bones are too small.

If my bones were big enough, i'd do PRECICE 10.7+

If my only option was PRECICE 8.5mm then I would still choose LON.
I think Precice Max 8.5mm is a good choice for you.

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I have completed the conceptual design one more type of intramedullary nail with a different operating mechanism (Type 3) —simple yet exceptionally strong under load—making it especially suited for small‑diameter applications. However, convenience is sacrificed to achieve these properties. This design could be ready for prototype testing within the next few years.
Depending on the test results, it may or may not go into production. The gap between an 8.5 mm and a 10 mm diameter corresponds to a 0.75 mm layer; if a 0.75 mm layer is problematic, then the bone is truly small. I believe the concern isn’t the nail’s load‑bearing capacity but the recovery and strength of small bones. When small bones are lengthened, the risk of fracture increases significantly. Therefore, I have advised individuals in this group to engage in high‑intensity physical training to mitigate these risks. Heavy training also helps increase bone size substantially.

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I did LON, but I would have done precice if I had the money.