New LL Nail Design - Optimized - Limb Lengthening Community

Member

Posts: 34

Joined: Jul 2025

Posted on Jul 11, 2025, 2:19 am

#1

Hello everyone, I’m an engineer and have personally undergone limb lengthening (LL). From my experience, I realized that the design of the nail plays a crucial role in the LL process — it not only affects recovery efficiency but also accounts for a significant portion of the total cost.

That’s why I’m developing a new nail design with the following criteria:

Low cost, similar to solid nails, to make limb lengthening more accessible to a wider group of people.
Fully mechanical operation, yet smooth and reliable like the Precice nail.
Fully internal, eliminating the need for an external fixator.
Made from common materials like stainless steel, but with strength comparable to Betz or Solid nails.

I hope my design can provide a practical and affordable option for the LL community without compromising on performance or safety.

Do you think a nail like this could actually exist? Please share your ideas and suggestions here!

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U

Unknown

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Posts: 32

Joined: Dec 2020

Posted on Jul 11, 2025, 6:46 am

#2

Ideally a titanium nail that has more biocompability with the body, otherwise a good quality stainless steel that allows for nail reversal for times of non union to reverse lengthening. Not sure if possible with mechanical nail though.

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N

nvafee

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Posts: 451

Joined: Jul 2025

Posted on Jul 11, 2025, 7:38 am

#3

Quote from: Unknown on July 11, 2025, 06:46:43 AMIdeally a titanium nail that has more biocompability with the body, otherwise a good quality stainless steel that allows for nail reversal for times of non union to reverse lengthening. Not sure if possible with mechanical nail though.

Thank you! Titanium is definitely a great option. Grade 5 titanium has better hardness than many types of stainless steel. However, there are certain stainless steels that are even harder than Grade 5 titanium and are also more affordable. When prototyping, I plan to use several different alloy types to test their real-world strength and determine the most optimal material choice.

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L

Limb lengthening 2030

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Posts: 90

Joined: Jul 2025

Posted on Jul 11, 2025, 2:23 pm

#4

What do you think in how many years could your Nail be available how much mm long will the Nail be and what could be the price of the Nail

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N

nvafee

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Posts: 420

Joined: Jul 2025

Posted on Jul 12, 2025, 3:07 am

#5

The design of this nail is nearly complete. I'm currently preparing the necessary machining equipment to create the first prototype. After that, I plan to apply for a patent. Mass production may take some time, but I believe it won't take more than five years.
The pricing may depend on various factors such as initial investment costs, production volume, and more. However, I believe it will still be more affordable than current internal designs, even though it offers more advantages. During the first year of production, there will be several pricing incentives and discounts available.

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C

Charizard

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Posts: 404

Joined: Oct 2021

Posted on Jul 12, 2025, 3:18 pm

#6

How it will do the lengthening? Twisting?

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N

nvafee

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Posts: 258

Joined: Jul 2025

Posted on Jul 12, 2025, 3:47 pm

#7

Quote from: Charizard on July 12, 2025, 03:18:47 PMHow it will do the lengthening? Twisting?

I believe the Twist design has already been patented.

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N

nvafee

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Posts: 90

Joined: Jul 2025

Posted on Jul 12, 2025, 4:41 pm

#8

This nail operates with a completely new mechanism. You guys should also come up with a cool and impressive name for it.

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H

Harry99

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Posts: 472

Joined: Dec 2023

Posted on Jul 12, 2025, 5:01 pm

#9

Which country are you from, USA? My man

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N

nvafee

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Posts: 15

Joined: Jul 2025

Posted on Jul 13, 2025, 12:02 am

#10

Quote from: Harry99 on July 12, 2025, 05:01:16 PMWhich country are you from, USA? My man

Man, I’m not American and I don’t live in the U.S. right now either. Why did you think that? Does my English sound American or something?

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