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Published on: April 16, 2017
4D-printed adaptive hydrogel tissue expanders for ear and breast reconstruction
Di Wang1,2, Jia-Qi Lü3,4, Xiao Kuang2,5
1Plastic Surgery Hospital of Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, People's Republic of China.
Nature Biomedical Engineering
|June 1, 2026
Summary
Researchers developed a 4D-printed hydrogel tissue expander for organ reconstruction. This advanced hydrogel offers tunable swelling and improved mechanics for minimally invasive surgeries, showing promise in preclinical models.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Surgical Innovation
Background:
- Hydrogel tissue expanders are crucial for organ and tissue reconstruction, but current options have limitations.
- Existing expanders often feature simple geometries, rapid swelling, and inadequate mechanical properties for complex reconstructions.
- Minimally invasive approaches using biofluid-swellable hydrogels show promise but require further development.
Purpose of the Study:
- To develop an advanced hydrogel tissue expander with sophisticated geometries and controlled expansion for surface organ and tissue reconstruction.
- To create a 4D-printed hydrogel ink capable of forming complex structures with tunable mechanical properties and prolonged swelling.
- To evaluate the efficacy and potential of this novel tissue expander in a preclinical model.
Main Methods:
- Development of a negatively charged polyelectrolyte hydrogel ink suitable for light-based 3D printing.
- Fabrication of architecturally sophisticated hydrogel constructs using 4D printing technology.
- Tuning the ionization degree and swelling behavior of the hydrogels via pH control.
- In vivo evaluation of the tissue expander's performance in a rabbit model for ear and breast reconstruction.
Main Results:
- The 4D-printed hydrogel tissue expander demonstrated tunable, prolonged, and large volume expansion (10-30 times) without external triggers.
- The constructs exhibited favorable mechanical properties and adapted to the surrounding environment.
- Successful reconstruction of human-size ears and breasts was achieved in a rabbit model.
- The developed hydrogel showed significant advantages over existing clinical methods.
Conclusions:
- The novel 4D-printed polyelectrolyte hydrogel tissue expander offers a promising solution for surface organ and tissue reconstruction.
- Its tunable expansion, adaptable mechanics, and sophisticated geometries overcome limitations of current technologies.
- The successful preclinical application highlights significant potential for future clinical translation in reconstructive surgery.
