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https://www.readbyqxmd.com/read/28726357/the-complexities-of-negative-dysphotopsia
#1
Ivayla I Geneva, Bonnie A Henderson
The appearance of a dark shadow in the temporal periphery, otherwise known as negative dysphotopsia, continues to be a problem for some patients after routine uncomplicated cataract surgery. Etiologies include type and design of intraocular lens (IOL), anatomical features and dimensions of the eye, pupil size, angle kappa, relationship of the optic to the anterior capsule, and the position of the optic/haptic junction of the IOL. Although the primary etiology remains controversial, it is clear that the cause is multifactorial...
July 18, 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28726356/intrascleral-iol-fixation
#2
Soonsan Jacob
Intrascleral sutureless intraocular lens (IOL) fixation utilizes direct haptic fixation within the sclera in eyes with deficient capsular support. This has advantages of long-term stability, good control of tilt and decentration, and lesser pseudophakodonesis. This review summarizes various techniques for intrascleral haptic fixation, results, complications, adaptations in special situations, modifications of the technique, combination surgeries, and intrascleral capsular bag fixation techniques (glued capsular hook)...
July 18, 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28715331/the-importance-of-haptics-in-generating-exoskeleton-gait-trajectory-using-alternate-motor-inputs
#3
Kiran K Karunakaran, Kevin M Abbruzzese, Hao Xu, Richard A Foulds
Human gait requires both haptic and visual feedback to generate and control rhythmic movements, and navigate environmental obstacles. Current lower extremity wearable exoskeletons that restore gait to individuals with paraplegia due to spinal cord injury rely completely on visual feedback to generate limited pre-programmed gait-variations, and generally provide little control by the user over the gait cycle. As an alternative to this limitation, we propose user control of gait in real time using healthy upper extremities...
July 13, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28712902/design-based-comparison-of-spine-surgery-simulators-optimizing-educational-features-of-surgical-simulators
#4
Won Hyung A Ryu, Ahmed E Mostafa, Navjit Dharampal, Ehud Sharlin, Gail Kopp, W Bradley Jacobs, R John Hurlbert, Sonny Chan, Garnette R Sutherland
BACKGROUND: Simulation-based education has made its entry into surgical residency training, particularly as an adjunct to hands-on clinical experience. However, one of the ongoing challenges to wide adoption is the capacity of simulators to incorporate educational features required for effective learning. The aim of this study was to identify strengths and limitations of spine simulators to characterize design elements that are essential in enhancing resident education. METHODS: We performed a mixed qualitative and quantitative cohort study with focused survey and interviews of stakeholders in spine surgery pertaining to their experiences on three spine simulators...
July 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28702736/changes-in-the-axon-terminals-of-primary-afferents-from-a-single-vibrissa-in-the-rat-trigeminal-nuclei-after-active-touch-deprivation-or-exposure-to-an-enriched-environment
#5
Julia Fernández-Montoya, Yasmina B Martin, Pilar Negredo, Carlos Avendaño
Lasting modifications of sensory input induce structural and functional changes in the brain, but the involvement of primary sensory neurons in this plasticity has been practically ignored. Here, we examine qualitatively and quantitatively the central axonal terminations of a population of trigeminal ganglion neurons, whose peripheral axons innervate a single mystacial vibrissa. Vibrissa follicles are heavily innervated by myelinated and unmyelinated fibers that exit the follicle mainly through a single deep vibrissal nerve...
July 12, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28696831/preliminary-testing-by-adults-of-a-haptics-assisted-robot-platform-designed-for-children-with-physical-impairments-to-access-play
#6
Isao Sakamaki, Kim Adams, Maria Fernanda Gomez Medina, Javier Leonardo Castellanos Cruz, Nooshin Jafari, Mahdi Tavakoli, Heidi Janz
Development of children's cognitive and perceptual skills depends heavily on object exploration and experience in their physical world. For children who have severe physical impairments, one of the biggest concerns is the loss of opportunities for meaningful play with objects, including physical contact and manipulation. Assistive robots can enable children to perform object manipulation through the control of simple interfaces. Touch sensations conveyed through haptic interfaces in the form of force reflection or force assistance can help a child to sense the environment and to control a robot...
July 11, 2017: Assistive Technology: the Official Journal of RESNA
https://www.readbyqxmd.com/read/28690514/synergistic-effects-on-the-elderly-people-s-motor-control-by-wearable-skin-stretch-device-combined-with-haptic-joystick
#7
Han U Yoon, Namita Anil Kumar, Pilwon Hur
Cutaneous sensory feedback can be used to provide additional sensory cues to a person performing a motor task where vision is a dominant feedback signal. A haptic joystick has been widely used to guide a user by providing force feedback. However, the benefit of providing force feedback is still debatable due to performance dependency on factors such as the user's skill-level, task difficulty. Meanwhile, recent studies have shown the feasibility of improving a motor task performance by providing skin-stretch feedback...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28684100/automaticity-of-force-application-during-simulated-brain-tumor-resection-testing-the-fitts-and-posner-model
#8
Abdulgadir Bugdadi, Robin Sawaya, Duaa Olwi, Gmaan Al-Zhrani, Hamed Azarnoush, Abdulrahman Jafar Sabbagh, Ghusn Alsideiri, Khalid Bajunaid, Fahad E Alotaibi, Alexander Winkler-Schwartz, Rolando Del Maestro
OBJECTIVE: The Fitts and Posner model of motor learning hypothesized that with deliberate practice, learners progress through stages to an autonomous phase of motor ability. To test this model, we assessed the automaticity of neurosurgeons, senior residents, and junior residents when operating on 2 identical tumors using the NeuroVR virtual reality simulation platform. DESIGN: Participants resected 9 identical simulated tumors on 2 occasions (total = 18 resections)...
July 3, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28680964/eye-tracking-of-occluded-self-moved-targets-role-of-haptic-feedback-and-hand-target-dynamics
#9
Frederic Danion, James Mathew, J Randall Flanagan
Previous studies on smooth pursuit eye movements have shown that humans can continue to track the position of their hand, or a target controlled by the hand, after it is occluded, thereby demonstrating that arm motor commands contribute to the prediction of target motion driving pursuit eye movements. Here, we investigated this predictive mechanism by manipulating both the complexity of the hand-target mapping and the provision of haptic feedback. Two hand-target mappings were used, either a rigid (simple) one in which hand and target motion matched perfectly or a nonrigid (complex) one in which the target behaved as a mass attached to the hand by means of a spring...
May 2017: ENeuro
https://www.readbyqxmd.com/read/28673724/three-dimensional-printed-haptic-model-from-a-prenatal-surface-rendered-oropalatal-sonographic-view-a-new-tool-in-the-surgical-planning-of-cleft-lip-palate
#10
R Nicot, G Couly, J Ferri, J-M Levaillant
Three-dimensional (3D) ultrasound has significantly improved prenatal screening and perinatal care in the area of cleft lip/palate and other deformities, providing essential preoperative information to the surgical team. However, current 3D reconstruction modalities are limited primarily to display on a two-dimensional surface. In contrast, a 3D printed haptic model allows both the surgeon and the parents to develop a better understanding of the anatomy and the surgical procedure through the ability to interact directly with the printed model...
June 30, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28661914/exploration-of-two-training-paradigms-using-forced-induced-weight-shifting-with-the-tethered-pelvic-assist-device-to-reduce-asymmetry-in-individuals-after-stroke-case-reports
#11
Lauri Bishop, Moiz Khan, Dario Martelli, Lori Quinn, Joel Stein, Sunil Agrawal
Many robotic devices in rehabilitation incorporate an assist-as-needed haptic guidance paradigm to promote training. This error reduction model, while beneficial for skill acquisition, could be detrimental for long-term retention. Error augmentation (EA) models have been explored as alternatives. A robotic Tethered Pelvic Assist Device has been developed to study force application to the pelvis on gait and was used here to induce weight shift onto the paretic (error reduction) or nonparetic (error augmentation) limb during treadmill training...
June 28, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28645855/training-surgical-residents-with-a-haptic-robotic-central-venous-catheterization-simulator
#12
David F Pepley, Adam B Gordon, Mary A Yovanoff, Katelin A Mirkin, Scarlett R Miller, David C Han, Jason Z Moore
OJECTIVE: Ultrasound guided central venous catheterization (CVC) is a common surgical procedure with complication rates ranging from 5 to 21 percent. Training is typically performed using manikins that do not simulate anatomical variations such as obesity and abnormal vessel positioning. The goal of this study was to develop and validate the effectiveness of a new virtual reality and force haptic based simulation platform for CVC of the right internal jugular vein. DESIGN: A CVC simulation platform was developed using a haptic robotic arm, 3D position tracker, and computer visualization...
June 20, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28643315/-technical-advantages-of-nano-carbon-development-combined-with-artery-approach-in-lymph-node-sorting-of-rectal-cancer
#13
Yuzhou Zhao, Guangsen Han, Jian Li, Yanhui Gu, Pengfei Ma, Chenyu Liu, Mingke Huo, Junli Zhang, Yanghui Cao, Shijia Zhang
OBJECTIVE: To explore the technical advantages of nano carbon development combined with artery approach in lymph node sorting of rectal cancer. METHODS: From December 2015 to June 2016, 70 patients with of rectal cancer in General Surgery Department of Henan Cancer Hospital were randomly divided into nano carbon development combined with artery approach group(artery approach group) and conventional group. Specimen of artery approach group was placed on the sorting table...
June 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28643300/-advantages-and-disadvantages-of-minimally-invasive-surgery-in-colorectal-cancer-surgery
#14
Minhua Zheng, Junjun Ma
Since the emergence of minimally invasive technology twenty years ago, as a surgical concept and surgical technique for colorectal cancer surgery, its obvious advantages have been recognized. Laparoscopic technology, as one of the most important technology platform, has got a lot of evidence-based support for the oncological safety and effectiveness in colorectal cancer surgery Laparoscopic technique has advantages in terms of identification of anatomic plane and autonomic nerve, protection of pelvic structure, and fine dissection of vessels...
June 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28637136/virtual-environment-navigation-with-look-around-mode-to-explore-new-real-spaces-by-people-who-are-blind
#15
Orly Lahav, Hadas Gedalevitz, Steven Battersby, David Brown, Lindsay Evett, Patrick Merritt
BACKGROUND: This paper examines the ability of people who are blind to construct a mental map and perform orientation tasks in real space by using Nintendo Wii technologies to explore virtual environments. The participant explores new spaces through haptic and auditory feedback triggered by pointing or walking in the virtual environments and later constructs a mental map, which can be used to navigate in real space. METHODS: The study included 10 participants who were congenitally or adventitiously blind, divided into experimental and control groups...
February 10, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28616798/postoperative-diffuse-opacification-of-a-hydrophilic-acrylic-intraocular-lens-analysis-of-an-explant
#16
Gian Maria Cavallini, Veronica Volante, Luca Campi, Michele De Maria, Elisa Fornasari, Giancarlo Urso
PURPOSE: We describe the clinicopathological and ultrastructural features of an opaque single-piece hydrophilic acrylic intraocular lens (IOL) explanted from a patient. METHOD: The main outcome of this report is the documentation of calcium deposits confirmed by surface analysis. The decrease in visual acuity was due to the opacification of the IOL. The opacification involved both the optic plate and the haptics. RESULTS: The analysis at the scansion electron microscope revealed that the opacity was caused by the deposition of calcium and phosphate within the lens optic and haptics...
June 14, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28616636/a-semi-automated-approach-to-improve-the-efficiency-of-medical-imaging-segmentation-for-haptic-rendering
#17
Pat Banerjee, Mengqi Hu, Rahul Kannan, Srinivasan Krishnaswamy
The Sensimmer platform represents our ongoing research on simultaneous haptics and graphics rendering of 3D models. For simulation of medical and surgical procedures using Sensimmer, 3D models must be obtained from medical imaging data, such as magnetic resonance imaging (MRI) or computed tomography (CT). Image segmentation techniques are used to determine the anatomies of interest from the images. 3D models are obtained from segmentation and their triangle reduction is required for graphics and haptics rendering...
June 14, 2017: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/28603892/flexible-zinc-tin-oxide-thin-film-transistors-operating-at-1-kv-for-integrated-switching-of-dielectric-elastomer-actuators-arrays
#18
Alexis Marette, Alexandre Poulin, Nadine Besse, Samuel Rosset, Danick Briand, Herbert Shea
Flexible high-voltage thin-film transistors (HVTFTs) operating at more than 1 kV are integrated with compliant dielectric elastomer actuators (DEA) to create a flexible array of 16 independent actuators. To allow for high-voltage operation, the HVTFT implements a zinc-tin oxide channel, a thick dielectric stack, and an offset gate. At a source-drain bias of 1 kV, the HVTFT has a 20 µA on-current at a gate voltage bias of 30 V. Their electrical characteristics enable the switching of DEAs which require drive voltages of over 1 kV, making control of an array simpler in comparison to the use of external high-voltage switching...
June 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28603509/emerging-trends-in-the-multimodal-nature-of-cognition-touch-and-handedness
#19
REVIEW
Miriam Ittyerah
Advances in tactile cognition and haptics have increased our understanding of the multimodal nature of touch. Haptic data is mostly confined to human performance arising from the flexibility and dexterity of the fingers used to discriminate shapes and objects. Studies with infants indicate that recognition of objects either seen or held in the hand is possible during early periods of infancy. Evidence indicates performance differences between the hands decrease over periods of development, reflecting maturation of the cortical brain system supporting motor skills...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28602318/combined-double-needle-flanged-haptic-intrascleral-fixation-of-an-intraocular-lens-and-descemet-stripping-endothelial-keratoplasty
#20
Lorenzo J Cervantes
A slight modification to the Yamane transconjunctival double-needle flanged-haptic technique of intrascleral fixation of an intraocular lens (IOL) shows the technique's usefulness when combined with Descemet-stripping endothelial keratoplasty (DSEK). The modification uses bipolar cautery to create flanges at the tip of the IOL haptics and delays tucking the haptics into the scleral tunnels until DSEK has been completed. Bipolar cautery enables the technique to be used in situations in which disposable low- or high-temperature cautery, as originally described, might not be possible...
May 2017: Journal of Cataract and Refractive Surgery
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