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https://www.readbyqxmd.com/read/28231556/compliant-support-surfaces-affect-sensory-reweighting-during-balance-control
#1
I M Schut, D Engelhart, J H Pasma, R G K M Aarts, A C Schouten
To maintain upright posture and prevent falling, balance control involves the complex interaction between nervous, muscular and sensory systems, such as sensory reweighting. When balance is impaired, compliant foam mats are used in training methods to improve balance control. However, the effect of the compliance of these foam mats on sensory reweighting remains unclear. In this study, eleven healthy subjects maintained standing balance with their eyes open while continuous support surface (SS) rotations disturbed the proprioception of the ankles...
February 9, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28231346/in-vitro-three-dimensional-accuracy-of-digital-implant-impressions-the-effect-of-implant-angulation
#2
Vanessa A Chia, Roxanna J Esguerra, Khim Hean Teoh, Juin Wei Teo, Keng Mun Wong, Keson B Tan
PURPOSE: To compare the three-dimensional (3D) accuracy of conventional impressions (CIs) with digital scans (DSs) using an intraoral scanner (IOS) with intraoral scan bodies (SBs) and varying buccolingual interimplant angulations. A secondary aim was to measure the SB machining tolerance and height with and without application of torque. MATERIALS AND METHODS: Three master models (MMs) with two implants simulating an implant-supported three-unit fixed partial denture for bone-level implants were used...
February 23, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28230622/restriction-of-cervical-intervertebral-movement-with-different-types-of-external-immobilizers-a-cadaveric-3d-analysis-study
#3
Micha Holla, Gerjon Hannink, Thomas G E Eggen, Robin A Daanen, Allard J F Hosman, Nico Verdonschot
STUDY DESIGN: Cadaveric radiostereometric analysis study. OBJECTIVE: To quantify the ability of 5 commonly used immobilizers to restrict cervical spine movement, including intervertebral movement, in three directions. SUMMARY OF BACKGROUND DATA: Evidence about the ability of many clinically used cervical immobilizers to restrict cervical movement is limited. Furthermore, their effect on intervertebral movement is unknown. METHODS: Radiographic inert beads were implanted in the cervical vertebral bodies of five fresh-frozen human cadavers...
February 22, 2017: Spine
https://www.readbyqxmd.com/read/28230572/automated-bone-screw-tightening-to-adaptive-levels-of-stripping-torque
#4
Karen J Reynolds, Aaron A Mohtar, Tammy M Cleek, Melissa K Ryan, Trevor C Hearn
OBJECTIVE: To use relationships between tightening parameters, related to bone quality, to develop an automated system that determines and controls the level of screw tightening. METHODS: An algorithm relating current at head contact (IHC) to current at construct failure (Imax) was developed. The algorithm was used to trigger cessation of screw insertion at a pre-defined tightening level, in real time, between head contact and maximum current. The ability of the device to stop at the pre-defined level was assessed...
February 20, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28230054/magnetization-switching-in-ferromagnets-by-adsorbed-chiral-molecules-without-current-or-external-magnetic-field
#5
Oren Ben Dor, Shira Yochelis, Anna Radko, Kiran Vankayala, Eyal Capua, Amir Capua, See-Hun Yang, Lech Tomasz Baczewski, Stuart Stephen Papworth Parkin, Ron Naaman, Yossi Paltiel
Ferromagnets are commonly magnetized by either external magnetic fields or spin polarized currents. The manipulation of magnetization by spin-current occurs through the spin-transfer-torque effect, which is applied, for example, in modern magnetoresistive random access memory. However, the current density required for the spin-transfer torque is of the order of 1 × 10(6) A·cm(-2), or about 1 × 10(25) electrons s(-1) cm(-2). This relatively high current density significantly affects the devices' structure and performance...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28229080/small-bowel-obstruction-due-to-a-giant-meckel-s-diverticulum
#6
Andreas Minh Luu, Kirsten Meurer, Torsten Herzog, Waldemar Uhl, Andrea Tannapfel, Chris Braumann
BACKGROUND: Meckel's diverticulum is the most common congenital anomaly of the gastrointestinal tract, with an average length of 3 cm. Complications occur in 6.4% and most commonly include inflammation and gastrointestinal bleeding. Preoperative diagnosis is demanding and achieved in 4%. CASE REPORT: A 34-year-old otherwise healthy patient presented with an acute abdomen due to small bowel obstruction. Computed tomography scan could not identify the underlying cause...
December 2016: Visceral Medicine
https://www.readbyqxmd.com/read/28228582/multi-digit-force-control-during-unconstrained-grasping-in-response-to-object-perturbations
#7
Abdeldjallil Naceri, Alessandro Moscatelli, Robert Haschke, Helge Ritter, Marco Santello, Marc O Ernst
Because of the complex anatomy of the human hand, in the absence of external constraints a large number of postures and force combinations can be used to attain a stable grasp. Motor synergies provide a viable strategy to solve this problem of motor redundancy. In this study, we exploited the technical advantages of an innovative sensorized object to study unconstrained hand grasping within the theoretical framework of motor synergies. Participants were required to grasp, lift, and hold the sensorized object...
February 22, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28228100/influence-of-hooks-and-a-lag-screw-on-internal-fixation-plates-for-lateral-malleolar-fracture-a-biomechanical-and-ergonomic-study
#8
Rina Sakai, Masataka Uchino, Terumasa Yoneo, Yasuaki Ohtaki, Hiroaki Minehara, Terumasa Matsuura, Tsutomu Gomi, Masanobu Ujihira
BACKGROUND: For internal fixation of AO classification Type B lateral malleolar fracture, insertion of lag screws into the fracture plane and fixation with a one-third tubular plate as a neutralization plate are the standard treatment procedures. The one-third tubular plate is processed to a hook shape and hung on the distal end of the fibula. In this study, to compare the function of the hook and lag screws of a one-third tubular plate and LCP for osteosynthesis of lateral malleolar fracture, mechanical indices of internal fixation were compared among the one-third tubular plates with lag screws with and without the hook and a locking compression plate...
February 23, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28227915/relationship-between-magnitude-of-applied-torque-in-pre-swing-phase-and-gait-change-for-prevention-of-trip-in-elderly-people
#9
Tamon Miyake, Mariko Tsukune, Yo Kobayashi, Shigeki Sugano, Masakatsu G Fujie, Tamon Miyake, Mariko Tsukune, Yo Kobayashi, Shigeki Sugano, Masakatsu G Fujie, Shigeki Sugano, Tamon Miyake, Masakatsu G Fujie, Yo Kobayashi, Mariko Tsukune
Elderly people are at risk of tripping because of their narrow range of articular motion. To avoid tripping, gait training that improves their range of articular motion would be beneficial. In this study we propose a gait-training robot that applies a torque during the pre-swing phase to achieve this goal. We investigated the relationship between magnitude of applied torque and change in the range of knee-articular motion while walking before and after the application of this torque. We developed a wearable robot and carried out an experiment on human participants in which a motor pulls a string embedded on the robotic frame, applying torque in the pre-swing phase for a period of 20 [s]...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227883/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#10
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Masami Iwamoto, Yuko Nakahira
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227672/robot-assisted-microsurgical-forceps-with-haptic-feedback-for-transoral-laser-microsurgery
#11
Nikhil Deshpande, Manish Chauhan, Claudio Pacchierotti, Domenico Prattichizzo, Darwin G Caldwell, Leonardo S Mattos, Nikhil Deshpande, Manish Chauhan, Claudio Pacchierotti, Domenico Prattichizzo, Darwin G Caldwell, Leonardo S Mattos, Darwin G Caldwell, Leonardo S Mattos, Nikhil Deshpande, Domenico Prattichizzo, Manish Chauhan, Claudio Pacchierotti
In this paper, a novel, motorized, multi-degrees-of-freedom (DoF), microsurgical forceps tool is presented, which is based on a master-slave teleoperation architecture. The slave device is a 7-DoF manipulator with: (i) 6-DoF positioning and orientation, (ii) 1 open/close gripper DoF; and (iii) an integrated force/torque sensor for tissue grip-force measurement. The master device is a 7-DoF haptic interface which teleoperates the slave device, and provides haptic feedback in its gripper interface. The combination of the device and the surgeon interface replaces the manual, hand-held device providing easy-to-use and ergonomic tissue control, simplifying the surgical tasks...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227646/a-wearable-robotic-orthosis-with-a-spring-assist-actuator
#12
Seungmin Jung, Chankyu Kim, Jisu Park, Dongyoub Yu, Jaehwan Park, Junho Choi, Seungmin Jung, Chankyu Kim, Jisu Park, Dongyoub Yu, Jaehwan Park, Junho Choi, Dongyoub Yu, Jaehwan Park, Junho Choi, Seungmin Jung, Chankyu Kim, Jisu Park
This paper introduces a wearable robotic orthosis with spring-assist actuators, which is designed to assist people who have difficulty in walking. The spring-assist actuator consists of an electrical motor and a spring, which are attached to a rotational axis in parallel to each other. The spring-assist actuator is developed based on the analysis on the stiffness of the knee and hip joints during walking. "COWALK-Mobile," which is a wearable robotic orthosis, is developed using the spring-assist actuators to reduce the required motor torque during walking...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227638/simulation-of-fluid-environment-using-a-robotic-orthosis-on-human-lower-extremity-for-therapeutic-purposes
#13
Tayfun Efe Ertop, Tolga Yuksel, Erhan Ilhan Konukseven, Tayfun Efe Ertop, Tolga Yuksel, Erhan Ilhan Konukseven, Tolga Yuksel, Erhan Ilhan Konukseven, Tayfun Efe Ertop
Rehabilitation under water is a viable physical rehabilitation option, but it has some limitations in terms of adapting to needs of each patient. In addition, its facility requirements are relatively high. Simulating the fluid environment using a robotic system would enable therapists adjust various parameters so that the therapy is tailored to the patient's unique state. Also, using a robotic system instead might be less costly and easily reachable. In this study, human lower extremity movement in fluids is modeled...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227609/spring-operated-wearable-enhancer-for-arm-rehabilitation-springwear-after-stroke
#14
Ji Chen, Peter S Lum, Ji Chen, Peter S Lum, Ji Chen, Peter S Lum
A 5-DOF spring actuated exoskeleton, called SpringWear, was developed to increase range of motion in the affected arms of stroke patients. Theoretically perfect gravity compensation is provided at the shoulder elevation DOF. Additional torque is provided to assist weakness in forearm supination and elbow extension. Three stroke patients were tested. All of the assisted joints increased in range of motion, and larger gains should be possible with refinements in the available torque profiles. Additionally, finger range of motion was increased in one subject when asked to open the hand while holding the shoulder at 90 degrees of elevation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227240/measurement-of-shank-angle-during-stance-using-laser-range-finders
#15
Pouya Amiri, Luke J MacLean, Robert E Kearney, Pouya Amiri, Luke J MacLean, Robert E Kearney, Robert E Kearney, Luke J MacLean, Pouya Amiri
Ankle joint stiffness, the dynamic relationship between the joint angle and the torque acting about it, plays an important role in the control of upright stance. In order to identify the contribution of ankle joint stiffness to stance control, ankle joint must be perturbed externally. One way to do this is to displace the foot that will cause shank movement. For identification, the ankle angle must be measured with high accuracy, for which we need to measure both foot and shank angles. However, most motion capture systems do not have the resolution and accuracy needed to measure the small ankle joint movements that occur during stance...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227236/a-wheelchair-with-lever-propulsion-control-for-climbing-up-and-down-stairs
#16
Kai Sasaki, Yosuke Eguchi, Kenji Suzuki, Kai Sasaki, Yosuke Eguchi, Kenji Suzuki, Kenji Suzuki, Yosuke Eguchi, Kai Sasaki
This study proposes a novel stair-climbing wheelchair based on lever propulsion control using the human upper body. Wheelchairs are widely used as supporting locomotion devices for people with acquired lower limb disabilities. However, steps and stairs are critical obstacles to locomotion, which restrict their activities when using wheelchairs. Previous research focused on power-assisted, stair-climbing wheelchairs, which were large and heavy due to its large actuators and mechanisms. In the previous research, we proposed a wheelchair with lever propulsion mechanism and presented its feasibility of climbing up the stairs...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226963/design-and-characterization-of-a-torque-controllable-actuator-for-knee-assistance-during-sit-to-stand
#17
Max K Shepherd, Elliott J Rouse, Max K Shepherd, Elliott J Rouse, Elliott J Rouse, Max K Shepherd
Individuals with post-stroke hemiparesis often have difficulty standing out of a chair. One way to potentially improve sit-to-stand is to provide knee extension assistance using a powered knee exoskeleton. An exoskeleton providing unilateral, partial assistance during sit-to-stand would need to be torque-controllable. There are no knee exoskeletons on the market suitable for conducting experiments assisting stroke patients with sit-to-stand, so to enable such experiments a research device was developed. The purpose of this report is to present the design of a novel knee exoskeleton actuator that uses a fiberglass leaf spring in series to improve torque-controllability, and present a characterization of the actuator performance...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226944/3d-force-torque-characterization-of-emergency-cricothyroidotomy-procedure-using-an-instrumented-scalpel
#18
Adam Ryason, Ganesh Sankaranarayanan, Kathryn L Butler, Marc DeMoya, Suvranu De, Adam Ryason, Ganesh Sankaranarayanan, Kathryn L Butler, Marc DeMoya, Suvranu De, Suvranu De, Marc DeMoya, Kathryn L Butler, Ganesh Sankaranarayanan, Adam Ryason
Emergency Cricothyroidotomy (CCT) is a surgical procedure performed to secure a patient's airway. This high-stakes, but seldom-performed procedure is an ideal candidate for a virtual reality simulator to enhance physician training. For the first time, this study characterizes the force/torque characteristics of the cricothyroidotomy procedure, to guide development of a virtual reality CCT simulator for use in medical training. We analyze the upper force and torque thresholds experienced at the human-scalpel interface...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226915/miniaturized-force-torque-sensor-for-in-vivo-measurements-of-tissue-characteristics
#19
M Hessinger, T Pilic, R Werthschutzky, P P Pott, M Hessinger, T Pilic, R Werthschutzky, P P Pott, R Werthschutzky, M Hessinger, T Pilic, P P Pott
This paper presents the development of a surgical instrument to measure interaction forces/torques with organic tissue during operation. The focus is on the design progress of the sensor element, consisting of a spoke wheel deformation element with a diameter of 12 mm and eight inhomogeneous doped piezoresistive silicon strain gauges on an integrated full-bridge assembly with an edge length of 500 μm. The silicon chips are contacted to flex-circuits via flip chip and bonded on the substrate with a single component adhesive...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226840/effects-of-input-frequency-content-and-signal-to-noise-ratio-on-the-parametric-estimation-of-surface-emg-torque-dynamics
#20
Mahsa A Golkar, Robert E Kearney, Mahsa A Golkar, Robert E Kearney, Mahsa A Golkar, Robert E Kearney
The dynamic relationship between surface EMG (sEMG) and torque can be estimated from data acquired while subjects voluntarily modulate joint torque. We have shown that for such data, the input (EMG) contains a feedback component from the output (torque) and so accurate estimates of the dynamics require the use of closed-loop identification algorithms. Moreover, this approach has several other limitations since the input is controlled indirectly and so the frequency content and signal-to-noise ratio cannot be controlled...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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