Dual-Material 3D-Printed Intestinal Model Devices with Integrated Villi-like Scaffolds

2021 ◽  
Author(s):  
Nayere Taebnia ◽  
Rujing Zhang ◽  
Emil B. Kromann ◽  
Alireza Dolatshahi-Pirouz ◽  
Thomas L. Andresen ◽  
...  
Keyword(s):  
3D Printed ◽  
Dual Material

scholarly journals Design of a 3D-printed hand prosthesis featuring articulated bio-inspired fingers

2020 ◽  
pp. 095441192098088
Author(s):  
Juan Sebastian Cuellar ◽  
Dick Plettenburg ◽  
Amir A Zadpoor ◽  
Paul Breedveld ◽  
Gerwin Smit
Keyword(s):  
3D Printing ◽  
Design Principles ◽  
Prosthetic Hand ◽  
Hand Prosthesis ◽  
Fused Deposition ◽  
Pinch Force ◽  
Actuation System ◽  
3D Printed ◽  
Energy Dissipated ◽  
Dual Material

Various upper-limb prostheses have been designed for 3D printing but only a few of them are based on bio-inspired design principles and many anatomical details are not typically incorporated even though 3D printing offers advantages that facilitate the application of such design principles. We therefore aimed to apply a bio-inspired approach to the design and fabrication of articulated fingers for a new type of 3D printed hand prosthesis that is body-powered and complies with basic user requirements. We first studied the biological structure of human fingers and their movement control mechanisms in order to devise the transmission and actuation system. A number of working principles were established and various simplifications were made to fabricate the hand prosthesis using a fused deposition modelling (FDM) 3D printer with dual material extrusion. We then evaluated the mechanical performance of the prosthetic device by measuring its ability to exert pinch forces and the energy dissipated during each operational cycle. We fabricated our prototypes using three polymeric materials including PLA, TPU, and Nylon. The total weight of the prosthesis was 92 g with a total material cost of 12 US dollars. The energy dissipated during each cycle was 0.380 Nm with a pinch force of ≈16 N corresponding to an input force of 100 N. The hand is actuated by a conventional pulling cable used in BP prostheses. It is connected to a shoulder strap at one end and to the coupling of the whiffle tree mechanism at the other end. The whiffle tree mechanism distributes the force to the four tendons, which bend all fingers simultaneously when pulled. The design described in this manuscript demonstrates several bio-inspired design features and is capable of performing different grasping patterns due to the adaptive grasping provided by the articulated fingers. The pinch force obtained is superior to other fully 3D printed body-powered hand prostheses, but still below that of conventional body powered hand prostheses. We present a 3D printed bio-inspired prosthetic hand that is body-powered and includes all of the following characteristics: adaptive grasping, articulated fingers, and minimized post-printing assembly. Additionally, the low cost and low weight make this prosthetic hand a worthy option mainly in locations where state-of-the-art prosthetic workshops are absent.

scholarly journals Formation of Polarized, Functional Artificial Cells from Compartmentalized Droplet Networks and Nanomaterials, Using One‐Step, Dual‐Material 3D‐Printed Microfluidics

2019 ◽  
Vol 7 (1) ◽  
pp. 1901719 ◽  
Author(s):  
Jin Li ◽  
Divesh Kamal Baxani ◽  
William David Jamieson ◽  
Wen Xu ◽  
Victoria Garcia Rocha ◽  
...  
Keyword(s):  
Artificial Cells ◽  
One Step ◽  
3D Printed ◽  
Dual Material

scholarly journals Experimental Study on Mechanical Properties of Single- and Dual-material 3D Printed Products

2017 ◽  
Vol 10 ◽  
pp. 887-897 ◽  
Author(s):  
Heechang Kim ◽  
Eunju Park ◽  
Suhyun Kim ◽  
Bumsoo Park ◽  
Namhun Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
3D Printed ◽  
Dual Material

Controlling the mechanical behavior of dual-material 3D printed meta-materials for patient-specific tissue-mimicking phantoms

2016 ◽  
Vol 90 ◽  
pp. 704-712 ◽  
Author(s):  
Kan Wang ◽  
Yuanshuo Zhao ◽  
Yung-Hang Chang ◽  
Zhen Qian ◽  
Chuck Zhang ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Patient Specific ◽  
3D Printed ◽  
Specific Tissue ◽  
Dual Material

scholarly journals 3D Conductive Polymer Printed Metasurface Antenna for Fresnel Focusing

Designs ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 46
Author(s):  
Okan Yurduseven ◽  
Shengrong Ye ◽  
Thomas Fromenteze ◽  
Benjamin J. Wiley ◽  
David R. Smith
Keyword(s):  
Conductive Polymer ◽  
Dielectric Substrate ◽  
Substantial Effect ◽  
Band Frequency ◽  
Beam Focusing ◽  
Metal Plating ◽  
X Band ◽  
Frequency Regime ◽  
3D Printed ◽  
Dual Material

We demonstrate a 3D printed holographic metasurface antenna for beam-focusing applications at 10 GHz within the X-band frequency regime. The metasurface antenna is printed using a dual-material 3D printer leveraging a biodegradable conductive polymer material (Electrifi) to print the conductive parts and polylactic acid (PLA) to print the dielectric substrate. The entire metasurface antenna is 3D printed at once; no additional techniques, such as metal-plating and laser etching, are required. It is demonstrated that using the 3D printed conductive polymer metasurface, high-fidelity beam focusing can be achieved within the Fresnel region of the antenna. It is also shown that the material conductivity for 3D printing has a substantial effect on the radiation characteristics of the metasurface antenna.

3D Printed Models for Surgical Planning and Reconstructive Implant Design in Sphenoorbital Tumor Surgery

2016 ◽  
Vol 77 (S 02) ◽  
Author(s):  
Hassan Othman ◽  
Sam Evans ◽  
Daniel Morris ◽  
Saty Bhatia ◽  
Caroline Hayhurst
Keyword(s):  
Surgical Planning ◽  
Implant Design ◽  
Tumor Surgery ◽  
3D Printed
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