Abstract Embolization, which is a minimally invasive endovascular treatment, safe and effective procedure for treating vascular malformations (e.g., aneurysms). Hydrogel microfibers obtained via spatiotemporally controllable in situ photocrosslinking exhibit great potential embolizing aneurysms. However, this process challenging because of the absence biocompatible morphologically stable hydrogels difficulty continuously spinning extreme environments such as those involving tortuous geometry...

Abstract Flexible capacitive‐type touch sensors have significant potential in robotics, foldable displays, and wearable electronics. However, the general parallel‐plate structure of these unintentionally changes initial values sensitivity various situations, such as electromagnetic interference (EMI) bending. In present study, a double side EMI‐shielded bending‐insensitive sensor is proposed with linear response over wide detection range. The device has novel design that includes...

Abstract Multilayered 3D vascular replicas incorporating the complementary advantages of elastomers and hydrogels can serve as a training platform to realistically simulate endovascular intervention, preferred therapeutic procedure for cardio‐cerebrovascular disease. However, fabrication process is challenging because difficulty in uniformly coating thin hydrogel layer only on inner surface tortuous composed an elastomer monolayer. This study proposes effective strategy design produce...

Abstract Stretchable electrodes have emerged as a promising technology for soft robotics and wearable devices. One fabrication method that guarantees sustained elasticity high conductivity is directly filling or printing an elastic substrate with liquid metal (LM). However, it difficult to create patterns complex 3D shapes, such hole patterning, integration electrodes, flexible breadboards. Therefore, simple effective patterning fabricating stretchable electronics using LM proposed in this...

Abstract Dip coating has demonstrated great potential as a multimaterial method providing additional functions to substrates or producing freestanding microscopic layer upon removal of the substrate. In dip coating, liquid is applied on substrate by dipping and withdrawing it from bath, then curing in air. Thus, manufacturing uniformly thick layers serpentine 3D difficult due influence gravity during prolonged process, thus hindering overall applications this method. Herein, new proposed...

Abstract Conventional 3D printing methods require supporting material as a sacrificial layer to form stable structure and obtain the desired final product. The use of causes several problems, such damage surface materials during removal process. This results in considerable waste materials, energy, time. paper proposes new method create freestanding overhanging that does not material. printed hydrogel can guide transmit light by utilizing an situ within hydrogel, similar optical fiber. show...

Poly(dimethylsiloxane) (PDMS) is used in microfluidics owing to its biocompatibility and simple fabrication. However, intrinsic hydrophobicity biofouling inhibit microfluidic applications. Conformal hydrogel-skin coating for PDMS microchannels, involving the microstamping transfer of masking layer, reported herein. A selective uniform hydrogel layer with a thickness ∼1 μm was coated diverse microchannels resolution ∼3 μm, maintaining structure hydrophilicity after 180 days (6 months). The...

Objective To date, no vascular model to analyze frictional forces between stent retriever devices and vessel walls has been designed be similar the real human vasculature. We developed a novel in vitro intracranial cerebrovascular analyzed of three devices. Methods A mold was created based on digital subtraction angiography patient's cerebral vessels. The constructed using polydimethylsiloxane (PDMS, Dow Corning, Inc.) as silicone elastomer. coated its inner surface with lubricating layer...

Abstract A transparent self‐healing coating incorporating chambers and capsules capable of preventing the propagation cracks in glass is presented. The main features simultaneously satisfy requirements high transmittance (≈90% visible region) ability to heal random large‐area coated‐glass materials (up 6 cm long, 20 µm wide, 1 mm deep per chamber). Additionally, polymerized hydrogel used as healing agent can stop crack because its mechanical strength good adhesion glass. Remarkably, healed...

Abstract Conventional 3D printing methods require the addition of a supporting layer in order to accurately and reliably fabricate desired final product. However, use material is not economically viable, during process removing material, shape or properties product may be distorted. In our previous work, we proposed demonstrated concept new method that utilizes situ light as guide for fabrication freestanding overhanging structures without need material. this study, influence intensity on...

Abstract 3D vascular replicas are an economical and ethical training platform that can simulate endovascular intervention. During the manufacture of elaborate through sacrificial molding, surface 3D‐printed pristine molds should be smoothed because layered filament is transferred to inner replicas. However, conventional smoothing methods using organic solvents take >3 d, thereby limiting emergency use This study demonstrates rapid accurate with a smooth wax‐coated molds. The wax coating...

This study proposes a method for fabricating three-dimensional overhanging structure of photo-polymerized hydrogel without supporting material as sacrificial layer. The manufacturing utilizes precise micro-droplet printing technique and light-guiding hydrogel. light is guided into polymerized focused on the tip structure. controlled micro-droplets precursor are accurately positioned at structure, then immediately deposited by light. proposed economical effective because its simple process...

In article number 2006759, Hyung Joon Cha, Joonwon Kim, and co-workers develop an optical-fiber-integrated microfluidic device that can continuously form hydrogel microfibers via in situ photo-crosslinking extreme endovascular environments. The are based on a double-crosslinked alginate employs the dityrosine bond. This with is attractive strategy to fill aneurysms effectively.

In article number 1901485, Joonwon Kim and co-workers propose a new dip coating method to fabricate uniformly thick layers covering the entire surface of serpentine 3D substrate by using uniquely designed supporting liquid that provides an immiscible, density-matched, interfacial-tension-minimized phase condition. This can create vascular replica (i.e., freestanding hollow tubular structure) with similar layer thickness luminal diameter major cerebral arteries.

In article number 2003395, Joonwon Kim and Jongkyeong Lim propose high-fidelity 3D vascular replicas composed of elastomer–hydrogel multilayers by coating hydrogel polymers with robust interfaces only on the inner surface elastomer monolayer. The proposed can facilitate realistic simulation endovascular intervention.

As an alternative to conventional 3D printing methods that require supports, a new strategy utilizes guided light in situ has been developed for fabricating freestanding overhanging structures without supports. Light intensity found be crucial factor modifying the dimensions of printed using this method; however, underlying mechanism not clearly identified. Therefore, light-intensity-dependent changes structure were analyzed study elucidate associated mechanism. Essentially, entire process...