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 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 3D-Printed Graphene Antennas and Interconnections for Textile RFID Tags: Fabrication and Reliability towards Humidity

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Han He ◽  
Mitra Akbari ◽  
Lauri Sydänheimo ◽  
Leena Ukkonen ◽  
Johanna Virkki
Keyword(s):  
Rfid Tags ◽  
High Humidity ◽  
Direct Write ◽  
Uhf Rfid ◽  
Printed Antenna ◽  
Passive Uhf Rfid ◽  
Measurement Results ◽  
One Step ◽  
3D Printed ◽  
Wireless Measurement

We present the possibilities of 3D direct-write dispensing in the fabrication of passive UHF RFID graphene tags on a textile substrate. In our method, the graphene tag antenna is deposited directly on top of the IC strap, in order to simplify the manufacturing process by removing one step, that is, the IC attachment with conductive glue. Our wireless measurement results confirm that graphene RFID tags with printed antenna-IC interconnections achieve peak read ranges of 5.2 meters, which makes them comparable to graphene tags with epoxy-glued ICs. After keeping the tags in high humidity, the read ranges of the tags with epoxy-glued and printed antenna-IC interconnections decrease 0.8 meters and 0.5 meters, respectively. However, after drying, the performance of both types of tags returns back to normal.

One-step reconstruction with a 3D-printed, custom-made prosthesis after total en bloc sacrectomy: a technical note

2016 ◽  
Vol 26 (7) ◽  
pp. 1902-1909 ◽  
Author(s):  
Ran Wei ◽  
Wei Guo ◽  
Tao Ji ◽  
Yidan Zhang ◽  
Haijie Liang
Keyword(s):  
Technical Note ◽  
En Bloc ◽  
Custom Made ◽  
One Step ◽  
3D Printed

Direct, one-step molding of 3D-printed structures for convenient fabrication of truly 3D PDMS microfluidic chips

2015 ◽  
Vol 19 (1) ◽  
pp. 9-18 ◽  
Author(s):  
Ho Nam Chan ◽  
Yangfan Chen ◽  
Yiwei Shu ◽  
Yin Chen ◽  
Qian Tian ◽  
...  
Keyword(s):  
Microfluidic Chips ◽  
One Step ◽  
3D Printed

A Voiceprint Recognition Sensor Based on a Fully 3D‐Printed Triboelectric Nanogenerator via a One‐Step Molding Route

2020 ◽  
Vol 22 (5) ◽  
pp. 1901560
Author(s):  
Rui Guo ◽  
Hulin Zhang ◽  
Zhen Pei ◽  
Song Yang ◽  
Chao Ge ◽  
...  
Keyword(s):  
Triboelectric Nanogenerator ◽  
One Step ◽  
3D Printed

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

3D camera-based markerless navigation system for robotic osteotomies

2020 ◽  
Vol 68 (10) ◽  
pp. 863-879
Author(s):  
Tim Übelhör ◽  
Jonas Gesenhues ◽  
Nassim Ayoub ◽  
Ali Modabber ◽  
Dirk Abel
Keyword(s):  
Augmented Reality ◽  
Particle Filter ◽  
Navigation System ◽  
Setup Time ◽  
Cadaver Study ◽  
Phantom Study ◽  
Depth Images ◽  
3D Camera ◽  
One Step ◽  
3D Printed

AbstractA markerless system for the registration of a bone’s pose is presented which reduces the setup time and the damage to the bone to a minimum. For the registration, a particle filter is implemented which is able to estimate a bone’s pose using depth images. In a phantom study, the pose of 3D-printed bones has been estimated at a rate of 90 Hz and with a precision of a few millimeters. The particle filter is stable under partial occlusions and only diverges when the bone is fully occluded. During a cadaver study, the preoperatively planned cutting edges have been projected as augmented reality (AR) templates onto the hip bones of five cadavers. By cutting manually along the AR templates, surgeons were able to extract ten transplants in the same time as with conventional osteotomy templates. Using the presented navigation system can save hours spent on the construction and production of conventional templates. In conclusion, this work represents one step towards a broader acceptance of robotic osteotomies.

scholarly journals Facile Tailoring of Contact Layer Characteristics of the Triboelectric Nanogenerator Based on Portable Imprinting Device

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 872 ◽  
Author(s):  
Sumin Cho ◽  
Sunmin Jang ◽  
Moonwoo La ◽  
Yeongcheol Yun ◽  
Taekyung Yu ◽  
...  
Keyword(s):  
High Strength ◽  
Contact Layer ◽  
Finger Tapping ◽  
Triboelectric Nanogenerator ◽  
Close Attention ◽  
Output Performance ◽  
Contact Electrification ◽  
One Step ◽  
3D Printed ◽  
Electrical Output

Renewable energy harvesting technologies have been actively studied in recent years for replacing rapidly depleting energies, such as coal and oil energy. Among these technologies, the triboelectric nanogenerator (TENG), which is operated by contact-electrification, is attracting close attention due to its high accessibility, light weight, high shape adaptability, and broad applications. The characteristics of the contact layer, where contact electrification phenomenon occurs, should be tailored to enhance the electrical output performance of TENG. In this study, a portable imprinting device is developed to fabricate TENG in one step by easily tailoring the characteristics of the polydimethylsiloxane (PDMS) contact layer, such as thickness and morphology of the surface structure. These characteristics are critical to determine the electrical output performance. All parts of the proposed device are 3D printed with high-strength polylactic acid. Thus, it has lightweight and easy customizable characteristics, which make the designed system portable. Furthermore, the finger tapping-driven TENG of tailored PDMS contact layer with microstructures is fabricated and easily generates 350 V of output voltage and 30 μA of output current with a simple finger tapping motion-related biomechanical energy.

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