Conventional 3D bioprinting cannot reliably generate true capillary-scale networks with precise spatial control under cell‑compatible conditions.
This technology introduces a one‑step, multi‑kinetic 4D bioprinting platform that prints multiple cell‑laden bioinks in a single process and then triggers coordinated, selective shrinkage of pre‑designed vessels down to capillary dimensions under physiological conditions.​

Technology Description

• A thermo‑responsive, cell‑friendly hybrid bioink composed of nanogels interpenetrated with an omentum‑derived ECM hydrogel that undergoes large, irreversible volumetric shrinkage above 32–37 °C while maintaining viscoelasticity and degradability
• The hybrid ink is engineered as a network where nanoparticles (500–900 nm) are entrapped within crosslinked collagen nanofibers, enabling nanoscale deswelling to mechanically compact the ECM network and drive macroscopic shrinkage.​
• Three coordinated thermo‑responsive bioinks are co‑printed in a support bath:
  • Cardiac ECM bioink laden with human iPSC‑derived cardiomyocytes to form the parenchyma
  • Gelatin microparticle bioink laden with iPSC‑derived endothelial cells to define the vessel lumens
  • ECM‑PNIPAM hybrid bioink localized around selected vessel segments as a “shrinking shell” for capillary formation.​
• The process yields perfusable, endothelialized vascular networks from arteriole‑like channels (>200 µm) to capillary‑like vessels <5–20 µm

Potential Applications

• Cardiac repair patches
• Organotypic constructs (e.g., heart, kidney, liver, brain)
• High‑fidelity, advanced In Vitro Models
• Generic 4D bioprinting platform to miniaturize printed features after deposition

Value Proposition Summary

The technology overcomes the resolution limits of extrusion‑based 3D bioprinting by using a coordinated, multi‑kinetic 4D response to “shrink‑fit” printed vascular structures to true capillary scale in a single, cell‑compatible step, without toxic monomers, harsh triggers, or post‑seeding. In vivo implantation on rat omentum demonstrated rapid anastomosis between printed human capillaries and host vasculature, supporting translational potential for regenerative medicine and transplantation.​

Stage

• in vitro POC in human iPSC‑derived vascularized cardiac tissues
• in vivo POC in rat omentum showing vascular integration and host–graft anastomosis after one week​

References

Baruch et al., Advanced Materials, 2026