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https://www.readbyqxmd.com/read/28104422/tipless-nitinol-stone-baskets-comparison-of-penetration-force-radial-dilation-force-opening-dynamics-and-deflection
#1
Nishant Patel, Arash Akhavein, Bryan Hinck, Rajat Jain, Manoj Monga
OBJECTIVE: To evaluate 5 commercially available tipless nitinol baskets (2.2F) in 4performance factors: penetration force, radial dilation force, opening dynamics and deflection limitation. MATERIAL AND METHODS: The 2.2F Coloplast Dormia No-Tip®, 1.5F Sacred Heart Medical Halo®, 2.2F Cook NCircle Nitinol Tipless Stone Extractor ®, 1.9F Bard SkyLite Tipless Nitinol Basket® and the 1.9F Boston Scientific Zero TipTM baskets were tested for penetration force (safety metric), radial dilation force (functional metric for ureteral calculi), and opening/closing dynamics...
January 16, 2017: Urology
https://www.readbyqxmd.com/read/28103514/pva-matches-human-liver-in-needle-tissue-interaction
#2
Tonke L de Jong, Loes H Pluymen, Dennis J van Gerwen, Gert-Jan Kleinrensink, Jenny Dankelman, John J van den Dobbelsteen
Medical phantoms can be used to study needle-tissue interaction and to train medical residents. The purpose of this research is to study the suitability of polyvinyl alcohol (PVA) as a liver tissue mimicking material in terms of needle-tissue interaction. Insertions into ex-vivo human livers were used for reference. Six PVA samples were created by varying the mass percentage of PVA to water (4m% and 7m%) and the number of freeze-thaw cycles (1, 2 and 3 cycles, 16hours of freezing at -19°C, 8hours of thawing)...
January 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28097112/surgical-results-of-the-cephalomedullary-nail-for-the-femoral-intertrochanteric-fracture-comparison-between-non-experienced-surgeons-and-experienced-surgeon
#3
Jae-Seong Seo, Hak-Jin Min, Dong Min Kim, Seung-Min Oh, Sang-Min Kim
PURPOSE: Cephalomedullary nail (CM nail) in the treatment of femoral intertrochanteric fractures is in the lime light in recent years. The purpose of this study is to compare surgical outcomes between experienced surgeon and non-experienced surgeons in respect of CM nail for femoral intertrochanteric fractures. MATERIALS AND METHODS: The 129 patients underwent CM nail for femoral intertrochanteric fracture more than six months of follow-up from April 2011 to March 2014 in Seoul Medical Center (Seoul, Korea) were participated in this study...
December 2016: Hip & Pelvis
https://www.readbyqxmd.com/read/28089885/variable-pulse-duration-from-a-new-ho-yag-laser-the-effect-on-stone-comminution-fiber-tip-degradation-and-retropulsion-in-a-dusting-model
#4
Daniel A Wollin, Anika Ackerman, Chen Yang, Tony Chen, Walter Neal Simmons, Glenn M Preminger, Michael E Lipkin
OBJECTIVE: To more clearly define the efficiency and potential benefits of variable pulse-width laser technology for ureteroscopic lithotripsy, we performed comparative in vitro evaluations assessing stone comminution, laser fiber tip degradation, and stone retropulsion. METHODS: All experiments were conducted using a Swiss LaserClast Ho: YAG laser (Electro Medical Systems, Nyon, Switzerland) with adjustable pulse duration (300 µs - 1500 µs). To assess comminution efficiency and fiber tip degradation, a "dusting" model was employed; the laser fiber tip was moved by a 3-dimensional positioning system in a spiral motion across a flat BegoStone surface submerged in water...
January 13, 2017: Urology
https://www.readbyqxmd.com/read/28088808/shunt-surgery-in-idiopathic-intracranial-hypertension-aided-by-electromagnetic-navigation
#5
Elvis J Hermann, Manolis Polemikos, Hans E Heissler, Joachim K Krauss
BACKGROUND: Idiopathic intracranial hypertension (IIH) is characterized by increased cerebrospinal fluid (CSF) pressure and normal or slit ventricles. Lumboperitoneal shunting had been favored by many investigators for CSF diversion in IIH for decades; however, it has been associated with various side effects. Because of the small ventricular size adequate positioning of a ventricular catheter is challenging. OBJECTIVES: Here, we investigated the usefulness of electromagnetic (EM)-guided ventricular catheter placement for ventriculoperitoneal shunting in IIH...
January 14, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28078374/-anaesthesia-procedures-and-invasive-vascular-access-in-severely-injured-patients-at-trauma-room-admission-in-germany-an-online-survey
#6
M F Struck, P Hilbert-Carius, B Hossfeld, J Hinkelbein, M Bernhard, T Wurmb
BACKGROUND: The continuous monitoring of vital parameters and subsequent therapy belong to the core duties of anaesthetists during acute trauma resuscitation in the trauma room. Important procedures may include placement of arterial lines and central venous catheters (CVCs). Knowledge of indication, performance and localization of invasive catheterisation of trauma care in Germany is scarce. METHODS: After approval of the German Society of Anaesthesiology and Intensive Care Medicine we conducted an online survey about arterial and central venous catheterisation of severely injured patients with consideration of common practice used by anaesthetists in German trauma rooms...
January 11, 2017: Der Anaesthesist
https://www.readbyqxmd.com/read/28077345/tips-and-traps-lessons-from-codesigning-a-clinician-e-monitoring-tool-for-computerized-cognitive-behavioral-therapy
#7
Frederick Sundram, Susan J Hawken, Karolina Stasiak, Mathijs Fg Lucassen, Theresa Fleming, Matthew Shepherd, Andrea Greenwood, Raechel Osborne, Sally N Merry
BACKGROUND: Computerized cognitive behavioral therapy (cCBT) is an acceptable and promising treatment modality for adolescents with mild-to-moderate depression. Many cCBT programs are standalone packages with no way for clinicians to monitor progress or outcomes. We sought to develop an electronic monitoring (e-monitoring) tool in consultation with clinicians and adolescents to allow clinicians to monitor mood, risk, and treatment adherence of adolescents completing a cCBT program called SPARX (Smart, Positive, Active, Realistic, X-factor thoughts)...
January 11, 2017: JMIR Mental Health
https://www.readbyqxmd.com/read/28069503/wettability-gradient-on-the-elytra-in-the-aquatic-beetle-cybister-chinensis-and-its-role-in-angular-position-of-the-beetle-at-water-air-interface
#8
Mingxia Sun, Yuan Chen, Yongmei Zheng, Mingming Zhen, Chunying Shu, Zhendong Dai, Aiping Liang, Stanislav N Gorb
: The surface of the elytra in some species of aquatic beetles displays relatively low contact angles (CAs), even showing hydrophilic properties. In this study, we report on an observation that both sexes of Cybister chinensis beetle fresh elytral surface do not exhibit uniform CA, but rather a wettability gradient along the longitudinal axis in posterior direction. The wettability is very different between females and males due to the presence (female) or absence (male) of channels on the elytral surface...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28058704/safety-and-efficacy-of-placing-internal-jugular-dialysis-catheter-tip-in-the-inferior-vena-cava
#9
Michael A M Mayer, Vinaya Soundararajan, Ramesh Soundararajan
PURPOSE: To assess the efficacy and safety of placing the tip of the internal jugular (IJ) hemodialysis catheter in the inferior vena cava (IVC) in situations where it does not work well when placed in the right atrium. METHODS: The medical records of chronic hemodialysis patients at an outpatient vascular intervention facility were retrospectively reviewed. Out of the 831 patients who had dialysis catheters exchanged over a 4-year period, 13 patients were identified who underwent catheter exchanges where the tip of the catheter was placed in the IVC via the IJ approach...
January 3, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/28057761/microtubules-are-reversibly-depolymerized-in-response-to-changing-gaseous-microenvironments-within-aspergillus-nidulans-biofilms
#10
Nandini Shukla, Aysha H Osmani, Stephen A Osmani
How microtubules (MTs) are regulated during fungal biofilm formation is unknown. By tracking MT +end binding proteins (+TIPS) in Aspergillus nidulans we report MTs are regulated to depolymerize within forming fungal biofilms. During this process EB1, dynein and ClipA form transient fibrous then bar-like structures, novel configurations for +TIPS. Cells also respond in an automatous manner with cells separated by a septum able to maintain different MT dynamics. Surprisingly, all cells with depolymerized MTs rapidly repolymerize their MTs after air exchange above the static culture media of biofilms...
January 5, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28057091/-resting-state-functional-magnetic-resonance-study-of-brain-function-changes-after-tips-operation-in-patients-with-liver-cirrhosis
#11
C Liu, H B Wang, Y Q Yu, M Q Wang, G B Zhang, L Y Xu, J M Wu
Objective: To investigate the brain function changes in cirrhosis patients after transjugular intrahepatic portosystemic shunt (TIPS), resting-state functional MRI (rs-fMRI) performed and fractional amplitude of low frequency fluctuation (fALFF) was analyzed. Methods: From January 2014 to February 2016, a total of 96 cirrhotic patients from invasive technology department and infection department in the First Affiliated Hospital of Anhui Medical University were selected , the blood ammonia data of 96 cirrhotic patients with TIPS operation in four groups were collected after 1, 3, 6 and 12 month, and all subjects performed rs-fMRI scans...
December 20, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28050413/as-the-nasal-spine-goes-so-goes-the-septum
#12
Devkumar Rengaraja, Mohan Jagade, Vitthal Kale, Anoop Attakil, Rajesh Kar, Arpita Singhal, Karthik Rao, Pallavi Gupta
INTRODUCTION: "As the septum goes, so goes the nose". A well-known phrase by Maurice Cottle forms the pillar of septoplasty. Since the inception of septal surgeries, numerous methods of septoplasty have been described. But, if not performed meticulously, may lead to deformity. For a successful surgery, understanding the anatomy and addressing the anterior nasal spine and maintaining the tip integrity is vital. AIM: To study the outcomes of "ROUND ABOUT technique" to correct deviated nasal septum which focuses on the importance of anterior spine and hence maintain the tip integrity...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28048822/su-f-j-163-in-vivo-quantification-of-sequence-parameter-effect-on-geometric-distortion-caused-by-implanted-titanium-brachytherapy-applicator
#13
T Sullivan, A Diak, M Surucu, J Yacoub, M Harkenrider, S Shea
PURPOSE: The use of MR to plan and evaluate brachytherapy treatment for cervical cancer is increasing given the availability of MR conditional or safe applicators and MRI's proven superiority to CT for characterizing soft tissue lesions. The titanium applicators, however, cause geometric distortions or imaging artifacts, which reduce the utility of MRI for dosimetry. We sought to quantify the observed volume of the same applicator on a previously optimized T2 sequence in comparison to the conventional T2 sequence and CT obtained for brachytherapy planning...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048463/th-c-brc-02-a-review-of-emerging-technologies-in-robotic-srs-sbrt-delivery
#14
L Wang
: The delivery techniques for SRS/SBRT have been under rapid developments in recent years, which pose new challenges to medical physicists ranging from planning and quality assurance to imaging and motion management. This educational course will provide a general overview of the latest delivery techniques in SRS/SBRT, and discuss the clinical processes to address the challenges of each technique with special emphasis on dedicated gamma-ray based device, robotic x-band linac-based system and conventional C-arm s-band linac-based SRS systems...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048139/su-f-j-227-accuracy-of-passive-magnetic-ultrasound-needle-guidance-in-high-fidelity-conventional-and-novel-simulated-block-approach-phantoms
#15
A Johnson
PURPOSE: The objective of this research was to demonstrate accuracy of a real-time passive ultrasound magnetic needle guidance technology (NGT) and target localization algorithm using conventional anechogenic contact phantoms and a novel fluid-filled hyperechogenic phantom simulating nerve block technique. METHODS: Accuracy (mm to phantom target) was assessed by observing 35 medical practitioners (16 anesthesiologists and 19 residents) performing 560 needle procedures in high-fidelity ex vivo porcine tissue phantoms...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047817/tu-h-campus-jep3-05-adaptive-determination-of-needle-sequence-hdr-prostate-brachytherapy-with-divergent-needle-by-needle-delivery
#16
M Borot de Battisti, B Denis de Senneville, M Maenhout, G Hautvast, D Binnekamp, J J W Lagendijk, M Van Vulpen, M A Moerland
PURPOSE: To develop a new method which adaptively determines the optimal needle insertion sequence for HDR prostate brachytherapy involving divergent needle-by-needle dose delivery by e.g. a robotic device. A needle insertion sequence is calculated at the beginning of the intervention and updated after each needle insertion with feedback on needle positioning errors. METHODS: Needle positioning errors and anatomy changes may occur during HDR brachytherapy which can lead to errors in the delivered dose...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047808/th-c-brc-03-emerging-linac-based-srs-sbrt-technologies-with-modulated-arc-delivery
#17
L Ren
: The delivery techniques for SRS/SBRT have been under rapid developments in recent years, which pose new challenges to medical physicists ranging from planning and quality assurance to imaging and motion management. This educational course will provide a general overview of the latest delivery techniques in SRS/SBRT, and discuss the clinical processes to address the challenges of each technique with special emphasis on dedicated gamma-ray based device, robotic x-band linac-based system and conventional C-arm s-band linac-based SRS systems...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047474/su-f-j-10-sliding-mode-control-of-a-sma-actuated-active-flexible-needle-for-medical-procedures
#18
T Podder
PURPOSE: In medical interventional procedures such as brachytherapy, ablative therapies and biopsy precise steering and accurate placement of needles are very important for anatomical obstacle avoidance and accurate targeting. This study presents the efficacy of a sliding mode controller for Shape Memory Alloy (SMA) actuated flexible needle for medical procedures. METHODS: Second order system dynamics of the SMA actuated active flexible needle was used for deriving the sliding mode control equations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047049/th-c-brc-00-emerging-technologies-in-srs-sbrt-delivery
#19
Lei Ren
: The delivery techniques for SRS/SBRT have been under rapid developments in recent years, which pose new challenges to medical physicists ranging from planning and quality assurance to imaging and motion management. This educational course will provide a general overview of the latest delivery techniques in SRS/SBRT, and discuss the clinical processes to address the challenges of each technique with special emphasis on dedicated gamma-ray based device, robotic x-band linac-based system and conventional C-arm s-band linac-based SRS systems...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046393/th-c-brc-01-an-overview-of-emerging-technologies-in-srs-sbrt-delivery
#20
L Ma
: The delivery techniques for SRS/SBRT have been under rapid developments in recent years, which pose new challenges to medical physicists ranging from planning and quality assurance to imaging and motion management. This educational course will provide a general overview of the latest delivery techniques in SRS/SBRT, and discuss the clinical processes to address the challenges of each technique with special emphasis on dedicated gamma-ray based device, robotic x-band linac-based system and conventional C-arm s-band linac-based SRS systems...
June 2016: Medical Physics
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