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https://www.readbyqxmd.com/read/28645855/training-surgical-residents-with-a-haptic-robotic-central-venous-catheterization-simulator
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/28600261/haptic-orientation-guidance-using-two-parallel-double-gimbal-control-moment-gyroscopes
#10
Julie Walker, Heather Culbertson, Michael Raitor, Allison Okamura
This paper presents a system of two double-gimbal control moment gyroscopes (CMGs) for providing ungrounded kinesthetic haptic feedback. By spinning a second flywheel opposite the first, and rotating them through opposite trajectories, undesired gyroscopic effects can be eliminated, isolating a single torque axis. This produces a moment pulse proportional to the flywheel spin speed and rotation speed. Rotating the CMG gimbals quickly in one direction, then resetting them more slowly generates repeated torque pulses indicating a clear direction cue...
June 7, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28593415/the-effects-of-laparoscopic-graspers-with-enhanced-haptic-feedback-on-applied-forces-a-randomized-comparison-with-conventional-graspers
#11
Chantal C J Alleblas, Michel P H Vleugels, Sjors F P J Coppus, Theodoor E Nieboer
BACKGROUND: Haptic feedback, which enables surgeons to perceive information on interaction forces between instrument and tissue, is deficient in laparoscopic surgery. This information, however, is essential for accurate tissue manipulation and recognition of tissue consistencies. To this end, a laparoscopic grasper with enhanced haptic feedback has been developed: the force reflecting operation instrument (FROI). This study tested the effects of enhanced haptic feedback on force control, tissue consistency interpretation, and the associated surgeons' level of confidence through a randomized controlled crossover experiment...
June 7, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28586929/-keratoprosthesis-with-biological-haptic-the-d%C3%A3-sseldorf-offenburg-experience-with-osteo-odonto-and-tibia-keratoprosthesis
#12
Gerd Geerling, Konrad Hille
In severe ocular surface disease with limbal stem cell deficiency associated with severe dry eye, penetrating keratoplasty is likely to fail. In these cases, and provided the posterior segment is normal, keratoprosthesis surgery (KPro) can achieve visual rehabilitation. In KPros with an autologous biological haptic, a bone-tooth-complex (osteo-odonto-keratoprothesis, OOKPro) or a piece of tibial cortex (tibia-keratoprosthesis, TKPro) is used to carry a PMMA cylinder. This construct can successfully be implanted even in severely dry eyes and in those with autoimmune disease, in which other KPro designs frequently fail...
June 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28579750/refractive-predictability-in-eyes-with-intraocular-gas-tamponade-results-of-a-prospective-controlled-clinical-trial
#13
Lars Wagenfeld, Kristin Hermsdorf, Birthe Stemplewitz, Vasyl Druchkiv, Andreas Frings
PURPOSE: To determine the postoperative refractive error in eyes with intraocular gas tamponade in combined phacovitrectomy using a Z-haptic intraocular lens (IOL). METHODS: This prospective non-randomized case-control study compared patients with combined phacovitrectomy with or without intraocular gas tamponade to cataract surgery-only. The main outcome measure was the IOL power prediction error (PE). Secondary outcome measures were spherical equivalent, anterior chamber depth (ACD), and axial length...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28578676/effects-of-optical-diameter-of-intraocular-lenses-with-intrascleral-fixation-on-higher-order-aberrations
#14
Daisuke Kunita, Makoto Inoue, Yuji Itoh, Naoko Matsuki, Toshiyuki Nagamoto, Akito Hirakata
BACKGROUND: Intrascleral fixation of an intraocular lens (IOL) is used in eyes that lack capsular support. The aim of the study is to determine whether a larger optical diameter IOL will decrease the higher-order aberrations (HOAs) when the haptics are extended for intrascleral fixation than a smaller diameter IOL. METHODS: Three-piece acrylic IOLs with 6.0 mm optics (X-60, VA-60BBR) and 7.0 mm optics (X-70, VA-70 AD) were fixed at lengths of 13, 14, 15, 16, or 17 mm...
June 2, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28575068/perception-of-force-and-stiffness-in-the-presence-of-low-frequency-haptic-noise
#15
Netta Gurari, Allison M Okamura, Katherine J Kuchenbecker
OBJECTIVE: This work lays the foundation for future research on quantitative modeling of human stiffness perception. Our goal was to develop a method by which a human's ability to perceive suprathreshold haptic force stimuli and haptic stiffness stimuli can be affected by adding haptic noise. METHODS: Five human participants performed a same-different task with a one-degree-of-freedom force-feedback device. Participants used the right index finger to actively interact with variations of force (∼5 and ∼8 N) and stiffness (∼290 N/m) stimuli that included one of four scaled amounts of haptically rendered noise (None, Low, Medium, High)...
2017: PloS One
https://www.readbyqxmd.com/read/28574369/a-multi-finger-interface-with-mr-actuators-for-haptic-applications
#16
Huanhuan Qin, Aiguo Song, Zhan Gao, Yuqing Liu, Guohua Jiang
Multi-finger operations provide realistic and natural methods when interacting with remote or virtual environment. Hence, haptic devices with multi-finger input are highly desirable. MR (Magneto-rheological) actuators are preferable options in haptics, because they can produce larger passive torque and have larger torque-volume ratios than the conventional actuators. Among the existing haptic MR actuators, most of them are still bulky and heavy. If they were smaller and lighter, they would become more suitable for haptics...
May 29, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28574362/low-cost-robotic-assessment-of-visuo-motor-deficits-in-alzheimer-s-disease
#17
Eleonora Bartoli, Francesca Caso, Giuseppe Magnani, Gabriel Baud-Bovy
A low-cost robotic interface was used to assess the visuo-motor performance of patients with Alzheimer's disease (AD). Twenty AD patients and twenty age-matched controls participated in the study. The battery of tests included simple reaction times, position tracking and stabilization tasks performed with both hands. The regularity, velocity, visual and haptic feedback were manipulated to vary movement complexity. Reaction times and movement tracking error were analyzed. Results show a marked group effect on a subset of conditions, in particular when the patients could not rely on the visual feedback of hand movement...
May 26, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28573991/surgical-refixation-of-posteriorly-dislocated-intraocular-lens-with-scleral-tuck-technique
#18
Pukhraj Rishi, Ekta Rishi, Aditya Maitray
PURPOSE: To report the outcomes of surgical refixation of posteriorly dislocated intraocular lens (IOL) using scleral-tuck method, and to compare the "scleral groove" and the "scleral flap" techniques used. STUDY DESIGN: Single-center, retrospective, interventional, comparative study. METHODS: Medical records of patients undergoing closed globe scleral refixation of posteriorly dislocated posterior chamber IOL (PCIOLs) by scleral-tuck method using two different techniques ("scleral groove" vs...
May 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28573091/virtual-reality-and-augmented-reality-in-plastic-surgery-a-review
#19
REVIEW
Youngjun Kim, Hannah Kim, Yong Oock Kim
Recently, virtual reality (VR) and augmented reality (AR) have received increasing attention, with the development of VR/AR devices such as head-mounted displays, haptic devices, and AR glasses. Medicine is considered to be one of the most effective applications of VR/AR. In this article, we describe a systematic literature review conducted to investigate the state-of-the-art VR/AR technology relevant to plastic surgery. The 35 studies that were ultimately selected were categorized into 3 representative topics: VR/AR-based preoperative planning, navigation, and training...
May 2017: Archives of Plastic Surgery
https://www.readbyqxmd.com/read/28549921/two-representations-of-a-high-dimensional-perceptual-space
#20
Jonathan D Victor, Syed M Rizvi, Mary M Conte
A perceptual space is a mental workspace of points in a sensory domain that supports similarity and difference judgments and enables further processing such as classification and naming. Perceptual spaces are present across sensory modalities; examples include colors, faces, auditory textures, and odors. Color is perhaps the best-studied perceptual space, but it is atypical in two respects. First, the dimensions of color space are directly linked to the three cone absorption spectra, but the dimensions of generic perceptual spaces are not as readily traceable to single-neuron properties...
May 23, 2017: Vision Research
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