Each Pectus is very different that's why selecting the right Vacuum Bell model for your specific pectus conformation is crucial for the success of the treatment. 
To determine what's the best VB model, you can download and print the VB perimeters HERE attach them on the body with scotch tape and see how they cover your pectus,
It works but it can be tricky because the device should be bigger than the PE area and the vacuum diameter is smaller than the nominal one.

The most accurate way is to have a consulting with Dr. Alexander Belkin HERE.

It requires  a 25 USD deposit that will be returned to you once you'll place your order, so it's free for all our customers                                 
Dr. Belkin is very expert so the margin of error is very minimal and doing so if you have any problem we will substitute the Vacuum Bell for you, even if it's a medical device.
We just need to provide the following info:

Birth date

Body height


Funnel depth

The distance between the centers of the nipples

For a more specific advice we need some photos (without a face for privacy)


⦿ Front view
1) Photo where the ruler is attached horizontally between the nipples
2) Photo where the ruler is attached vertically in the middle

⦿ Side view
3) One photo half right/half front

4) One half left/half front

You can send all the info to

We'll give you a response in the shortest amount of time possible, thank you very much :-)