Most people would probably think:.

How much force could a polymer spring really generate?

then how could we create meaningful force?

Then we realized—twisting could be the key.

First, apply tension to the polymer.

While maintaining that tension, twist the polymer.

More the twist, more the elastic energy is generated within the structure.

But how can that keep the energy inside of the structure?

While keeping the polymer under tension, coil the twisted polymer.

Then heat-treat the polymer.

Heat treatment itself does not generate the energy.

Its role is to contain and fix the energy within the twisted structure.

The shape of the spring is held in coiled shape.

This constrained shape is maintained while the device is inserted into the tissue.

Once the device reaches the target area, pull the hub tail to release the constraint.

Withdraw the cannula slowly according to the prescribed technique.

Finally, remove the retaining tube.

At this point, only the spring remains within the tissue.

Once the constraint is released, the spring begins to recover to its original shape by the elastic energy stored.

The resistance of the tissue limits complete recovery of the spring, but still the elastic recovery continues.

From this point onward, the surrounding tissues are exposed to continuous mechanical loading.

And this mechanical force becomes the starting point for a biological response.