Self-expanding cryogels hold unique prospects for treating
uncontrollable
hemorrhages. However, development of a mechanically robust, tissue-adhesive,
and bioactive self-expanding cryogel enabling effective hemostasis
and tissue repair has remained a great challenge. Herein, we report
a superelastic cellular-structured bioactive glass nanofibrous cryogel
(BGNC) composed of highly flexible BG nanofibers and citric acid-cross-linked
poly(vinyl alcohol). These BGNCs exhibit high absorption capacity
(3169%), fast self-expanding ability, near zero Poisson’s ratio,
injectability, high compressive recovery at a strain of 80%, robust
fatigue resistance (almost no plastic deformation after 800 cycles
at a strain of 60%), and good adhesion with diverse tissues. The BGNCs
provide sustained release of Ca, Si, and P ions. Moreover, the BGNCs
present better blood clotting and blood cell adhesion ability and
superior hemostatic capacity in rabbit liver and femoral artery hemorrhage
models as compared with commercial gelatin hemostatic sponges. In
addition, BGNCs are able to stop bleeding in rat cardiac puncture
injury in about 1 min. Furthermore, the BGNCs are capable of promoting
rat full-thickness skin wound healing. The development of self-expanding
BGNCs with superelasticity and bioadhesion provides a promising strategy
for exploring multifunctional hemostatic and wound repair materials.