The penetration of special medical devices into the body is always associated with discomfort and the danger of rejection. Therefore, German scientists from the University of Stuttgart decided to find a way to make this process more comfortable, safe and painless. To do this, they developed a complex system of microlenses the size of a crystal of salt.
To achieve the desired result, the scientists required submicron precision. For this, 3D printing technology was used, which made it possible to print 2 or more lenses at the same time. As it turned out, using a multi-lens, it became possible to correct aberration (blurry image), obtaining high quality images from smaller devices.
As a tool for creating a lens, the scientists decided to use a femtosecond laser with a pulse duration of 100 femtoseconds. With its help, they "exploded" a light-sensitive material located on a glass substrate.
Scientists have applied this technology to print components of an optical microscope with a diameter and length of 125 micrometers. They attached the resulting product to a piece of fiberglass 1.7 m long and 2 human hairs wide.
The result of the researchers' work is a camera attached to an endoscope, which is easily placed in the channel of a standard syringe needle, which allows it to be inserted into various organs, including the brain.