Evaluation of primary stability in bovine ribs following a correction in placement depth

For an implant to be successfully loaded at the time of placement it must have a certain degree of initial stability. While many factors have been shown to influence primary stability, this study aims to examine the effect of positional change on implant stability. 18 Straumann dental implants (16 Standard plus SLA active 3.3mm RN implants, 1 Standard plus SLA 3.3 mm RN implant, and 1 SLActive 4.1 mm RC bone level implant) were placed into two bovine ribs. Implants were divided into two groups with nine in each group and were either backed out or advanced. The primary stability was assessed using an Osstell Mentor device following each quarter turn, until a full turn had been completed. Data was recorded and analyzed using linear regression and ANOVA. Results showed that after half a turn in either direction a significant change in primary stability was seen. Minor changes in implant position with conical implants did not seem to greatly influence initial implant stability. However, reversing a dental implant, even a quarter turn, will result in a measurable decrease in primary stability and caution should be used if immediate loading is to be considered

Doctor of Philosophy

dissertationThe development of devices to electrically interact with the brain is a challenging task that could potentially restore motion to paralyzed patients and sight to those with profound blindness. Neural engineers have designed many types of microelectrode arrays (MEAs) with this challenge in mind. These MEAs can be implanted into brain tissue to both record neural signals and electrically stimulate neurons with high selectivity and spatial resolution. Implanted MEAs have allowed patients to control of a variety of prosthetic devices in clinical trials, but the longevity of such motor prostheses is limited to a few years. Performance decreases over time as MEAs lose the ability to record neuronal signals, preventing their widespread clinical use. Microstimulation via intracortical MEAs has also not achieved broad clinical implementation. While microstimulation for the restoration of vision is promising, human clinical trials are needed. Chronic in vivo functionality assays in model systems will provide key insight to facilitate such trials. There are three goals that may help address insufficient MEA longevity, as well as provide insight on microstimulation functionality. First, thorough characterizations of how performance decreases over time, both with and without stimulation, will be needed. Next, factors that affect the chronic performance of microstimulating MEAs must be further investigated. Finally, intervention strategies can be designed to mitigate these factors and improve long term MEA performance. This dissertation takes steps towards meeting these goals by means of three studies. First, the chronic performance of intracortically implanted recording and stimulating MEAs is examined. It is found that while performance of implanted MEAs in feline cortex is dynamic, catastrophic device failure does not occur with microstimulation. Next, a variety of factors that affect microstimulation studies are investigated. It is found that many factors, including device iv damage, anesthesia depth, the application of microstimulation, and the use of impedance as a reporter play a role in observations of performance variability. Finally, a promising intervention strategy, a carbon nanotube coating, is chronically tested in vivo, indicating that carbon nanotubes do not cause catastrophic device failure and may impart benefits to future generations of MEAs

Sandspur, Vol 79 No 12, April 27, 1973

Rollins College student newspaper, written by the students and published at Rollins College. The Sandspur started as a literary journal.https://stars.library.ucf.edu/cfm-sandspur/2434/thumbnail.jp

APLIKASI COMPUTER AIDED REVERSE ENGINEERING MENGGUNAKAN PHOTOGRAMMETRY UNTUK MEMBUAT DESAIN SOKET KAKI PROSTESIS PADA PASIEN TRANSTIBIAL AMPUTATION

Transtibial Amputation atau amputasi kaki pada bagian bawah lutut merupakan kegiatan medis yang bertujuan untuk memotong atau menghilangkan anggota bagian tubuh khususnya pada bagian dibawah lutut. Hal ini dapat disebabkan oleh penyakit, kecelakaan ataupun kondisi tertentu. Bapak Mugiyanto merupakan seorang penderita Transtibial Amputasi karena kecelakaan saat bekerja. Tim SIBAD UNDIP yang dibantu ATMI Surakarta mencoba membuat kaki palsu untuk mempermudah Bapak Mugiyanto dalam melakukan aktivitas sehari-hari. Penelitian ini bertujuan untuk mendesain dan mengukur soket untuk kaki palsu sebanyak tiga macam varian dengan ketebalan yang berbeda. Desain soket yang dibuat berdasarkan data kaki Bapak Mugiyanto yang didapatkan dengan metode Reverse Engineering teknik Photogrammetry dari penelitian sebelumnya. Soket didesain menggunakan PowerShape dari Wireframe secara akurat hingga menjadi bentuk Solid Mesh. Soket yang didesain akan diukur menggunakan Netfabb untuk pengukuran yang akurat dan detil

Dynamic pupil reacting to incident light dedicated to ocular implants

Background -- Physiological background -- Ocular prosthetics -- Technical background -- Recapitulation -- Intelligent ocular implants -- Robotic prosthetic eye -- Prosthetic eye with polarized pupil -- Photochromatic dilating pupil for ocular prosthetics -- Ocular prosthesis displaying iris and pupil on a LCD -- Dilating ocular prosthesis -- A new prosthetic dynamic pupil -- Discrete-component prototype -- Integrated version -- Power consumption -- Results -- Prototype experimental validation -- FPGA prototyping board -- Implementation of the full custom version -- Experimental results -- Comparison between experimental and post-layout results -- Low power ADC for better integration -- the integrated ADC -- Voltage-to-current converter -- Post-layout simulation results

Specifying a hybrid, multiple material CAD system for next-generation prosthetic design

For many years, the biggest issue that causes discomfort and hygiene issues for patients with lower limb amputations have been the interface between body and prosthetic, the socket. Often made of an inflexible, solid polymer that does not allow the residual limb to breathe or perspire and with no consideration for the changes in size and shape of the human body caused by changes in temperature or environment, inflammation, irritation and discomfort often cause reduced usage or outright rejection of the prosthetic by the patient in their day to day lives. To address these issues and move towards a future of improved quality of life for patients who suffer amputations, Loughborough University formed the Next Generation Prosthetics research cluster. This work is one of four multidisciplinary research studies conducted by members of this research cluster, focusing on the area of Computer Aided Design (CAD) for improving the interface with Additive Manufacture (AM) to solve some of the challenges presented with improving prosthetic socket design, with an aim to improve and streamline the process to enable the involvement of clinicians and patients in the design process. The research presented in this thesis is based on three primary studies. The first study involved the conception of a CAD criteria, deciding what features are needed to represent the various properties the future socket outlined by the research cluster needs. These criteria were then used for testing three CAD systems, one each from the Parametric, Non Uniform Rational Basis Spline (NURBS) and Polygon archetypes respectively. The result of these tests led to the creation of a hybrid control workflow, used as the basis for finding improvements. The second study explored emerging CAD solutions, various new systems or plug-ins that had opportunities to improve the control model. These solutions were tested individually in areas where they could improve the workflow, and the successful solutions were added to the hybrid workflow to improve and reduce the workflow further. The final study involved taking the knowledge gained from the literature and the first two studies in order to theorise how an ideal CAD system for producing future prosthetic sockets would work, with considerations for user interface issues as well as background CAD applications. The third study was then used to inform the final deliverable of this research, a software design specification that defines how the system would work. This specification was written as a challenge to the CAD community, hoping to inform and aid future advancements in CAD software. As a final stage of research validation, a number of members of the CAD community were contacted and interviewed about their feelings of the work produced and their feedback was taken in order to inform future research in this area

The 1st Advanced Manufacturing Student Conference (AMSC21) Chemnitz, Germany 15–16 July 2021

The Advanced Manufacturing Student Conference (AMSC) represents an educational format designed to foster the acquisition and application of skills related to Research Methods in Engineering Sciences. Participating students are required to write and submit a conference paper and are given the opportunity to present their findings at the conference. The AMSC provides a tremendous opportunity for participants to practice critical skills associated with scientific publication. Conference Proceedings of the conference will benefit readers by providing updates on critical topics and recent progress in the advanced manufacturing engineering and technologies and, at the same time, will aid the transfer of valuable knowledge to the next generation of academics and practitioners. *** The first AMSC Conference Proceeding (AMSC21) addressed the following topics: Advances in “classical” Manufacturing Technologies, Technology and Application of Additive Manufacturing, Digitalization of Industrial Production (Industry 4.0), Advances in the field of Cyber-Physical Systems, Virtual and Augmented Reality Technologies throughout the entire product Life Cycle, Human-machine-environment interaction and Management and life cycle assessment.:- Advances in “classical” Manufacturing Technologies - Technology and Application of Additive Manufacturing - Digitalization of Industrial Production (Industry 4.0) - Advances in the field of Cyber-Physical Systems - Virtual and Augmented Reality Technologies throughout the entire product Life Cycle - Human-machine-environment interaction - Management and life cycle assessmen