3D Printed Hydrogel Sensors on Deformable surfaces

  • We modeled the deformation of the target surface using a shape basis model that can be learned from a dataset of 3D scans. With the learned shape model, accurate surface geometry can be recovered in 3D via a set of markers tracked by a stereo-vision system. The recovered geometry is used to dynamically adapt the 3D printing toolpath in real time.

system.png
3D_cropped.gif
cam_view_deformable membrane_cropped.gif
deformable membrane.gif

Deformation model

learned via PCA

Camera view with

re-projected toolpath

Printing U of M logo

on a deformable surface

  • We incorporated an ionic hydrogel with electrical impedance tomography (EIT) technology to enable 3D-printed wearable sensors for in situ spatiotemporal mapping of 2D volumetric strain

strain_stress.png
hydrogel.gif

Transparent, strain-responsive hydrogel with tissue-like stretchability

EIT device.jpg
EIT sensor.gif

Hydrogel-based EIT sensor for real-time strain mapping

  • To demonstrate the closed-loop 3D printing system for real-time tracking of target deformation, a hydrogel-based EIT strain sensor was directly 3D printed on a breathing lung for in situ monitoring of deformations.

lung_demo.gif
EIT demo lung.gif
  • To demonstrate the capability to print multiple materials on a deformable target surface comprising a complicated geometry consisting of convex and concave features, colored silicone inks were printed on a deformable phantom face.

face.gif