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MIT engineers use 3D printing to develop new bandages

DateTime: 2018-04-08
浏览次数: 83

Original title: MIT engineers use 3D printing to develop new bandages

It is reported that MIT engineers used 3D printing technology to develop new types of bandages that are more tight and comfortable than traditional bandages. The new type of bandage is made of a special rubber film that can fit over your skin more. When your knees, elbows or other joints are injured, using traditional bandages will make your joints hard to move, and MIT The new 3D printed bandage developed by the Academy allows you to move freely. The design of the material is inspired by the folding of traditional papers and can also be used for various wearable 3D printing products. New bandages are made by 3D printing of special-shaped molds.


Gel Rubber

The team developed this material to remain tacky for a long time. In the test, after 100 cycles of bending, it can also maintain its shape. The key to the adhesiveness of the bandage is the slit pattern that the researcher has cut into the film, similar to the incision made in the folding paper folding art called kirigami, which is closely related to the folding paper.

The project was a Chinese medical company looking for a study from the MIT team and wondered if rubber film materials could be used to wrap wounds. Bandages are very common in our daily life, but when you try to attach them to places with unevenly curved movements, such as elbows and knees, they usually fall off, which is a big problem that medical companies need to solve.


Traditional bandages

These films are made by 3D printing of special-shaped molds filled with liquid rubber. The 3D printing technology makes it easy to place flat grooves of various pitches in the mold. These molds produce kirigami-type films with slits. Then, these materials were subjected to a tensile test and the amount of stretching recorded was the amount that the kirigami film could withstand before it was peeled from the surface of the polymer that had been added. This measures the key "energy release rate" of the material and will vary at different points in time.


New bandage will not fall off

Experiments with different shape materials allowed the team to identify three main parameters that gave the adhesion properties of the kirigami membrane. One of them is called shear lag. In this case, the shear deformation of the film can reduce the tension in other parts of the film. There is also partial peeling, in which the film portion around an open slit maintains a portion of the surface that adheres to the bottom layer. Another key aspect of the kirigami film is uneven deformation in which the film can maintain its total adhesion even when portions of its underlying surface may bend and stretch more than others.


New bandage raw materials

Using these findings, future designers are attempting to solve the problem of adhesion in a similar way. With regard to the number of positioning and cutting, these parameters can be used as a blueprint for formulating the most probable kirigami structure.

The resulting kirigami films are used by medical companies as analgesics, but they also play the same role in conventional wound dressings and more complex products such as wearable electronics. The team will further develop more advanced medical materials. The current membrane is a pure elastic rubber. Later research is to replace it with a gel, which directly spreads the drug into the skin.

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