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D Batiukov, V Podgaiski, D Ladutko
Polyurethane (PU) implants are associated with great difficulties in extraction if secondary surgery is needed. The published data are contradictory, often misleading, making the decision for the secondary surgery complicated, the time period and the procedure itself not optimal, thus negatively influencing the final result. MATERIALS AND METHODS: Typical videos of PU implant removal in different periods after primary surgeries with polyurethane implants were selected for the study. The videos show the strength and extent of the tissue ingrowth and the manipulations needed for implant extraction in different periods from the initial procedure...
October 11, 2018: Aesthetic Plastic Surgery
Linda Ll Benskin
No abstract text is available yet for this article.
October 2018: Annals of Surgical Treatment and Research
Subbalaxmi Selvaraj, Ramachandra Murty Vytla
Production of tannase was performed in packed bed reactor filled with an inert support polyurethane foam (PUF) using Bacillus gottheilii M2S2. The influence of process parameters such as fermentation time (24-72 h), tannic acid concentration (0.5-2.5% w/v), inoculum size (7-12% v/v), and aeration rate (0-0.2 L/min) on tannase production with PUF were analyzed using one variable at a time (OVAT) approach. The outcome of OVAT was optimized by central composite design. Based on the statistical investigation, the proposed mathematical model recommends 1% (w/v) of tannic acid, 10% (v/v) of inoculum size and 0...
October 10, 2018: Preparative Biochemistry & Biotechnology
Hiroyuki Kai, Yuto Kato, Ryoma Toyosato, Matsuhiko Nishizawa
Sensing of lactate in perspiration provides a way to monitor health and control exercise. The volume of perspiration is miniscule, and the efficient collection of perspiration is desired for its effective sensing. We developed mesh-type enzymatic electrodes fabricated on textile meshes and integrated the meshes into an enzymatic biofuel cell. We tested them as self-powered lactate sensors for a small volume of lactate solution. A fluid-permeable enzymatic anode was fabricated based on an insulating textile mesh that was coated with carbon nanotubes (CNTs) and lactate oxidase...
October 10, 2018: Analyst
Melissa Wallace, David B Johnson, William Pierce, Christopher Iobst, Anthony Riccio, R Lane Wimberly
BACKGROUND: We assessed the effect on the torsional stability by different pin diameters and varied pin configurations in a biomechanical supracondylar humerus fracture model. METHODS: After scanning a model of a pediatric humerus, the image was imported into software. Variable pin trajectories were planned. Acrylonitrile butadiene styrene plastic models were 3-dimensionally printed with predetermined pin trajectories. Models were osteotomized and potted with a polyurethane resin...
October 8, 2018: Journal of Pediatric Orthopedics
José Alfonso Alvarez-Rodríguez, Mario García-Suárez, Daniel Fernández-García, Carlos Méndez-Martínez, Juan Gómez-Salgado
The aim of this study was to analyse the characteristics of central venous catheters with brachial-implanted reservoirs and the complications associated with their use over a 4-years period. This observational study was carried out in an onco-haematological day hospital in Spain. Information was collected about 125 catheters inserted in patients requiring intravenous chemotherapy. There were more catheters implanted in women than men and the mean age was 58.6 years. Seventy of the implanted catheters were made of polyurethane and 55 of silicone...
October 9, 2018: European Journal of Cancer Care
Junling Wang, Dichang Zhang, Yan Zhang, Wei Cai, Congxue Yao, Yuan Hu, Weizhao Hu
Considerable toxic volatiles (CO and HCN) generation and high fire hazard has definitely compromised the application of thermoplastic polyurethane (TPU). Here, a novel functionalization strategy for bulky h-BN is adopted to obtain the multifunctional CPBN, aiming at the flame retardancy reinforcement of TPU. The multifunctional CPBN is successfully prepared via the wrapping of phytic acid doped polypyrrole shell, following with the adsorption of copper ions. The obviously decreased peak heat release rate, peak smoke production rate and total smoke production values, obtained from cone test, confirms the reduced fire hazard of TPU composite with CPBN...
September 9, 2018: Journal of Hazardous Materials
Seungil Kim, Yannick Leandre Traore, Emmanuel A Ho, Muhammad Shafiq, Soo-Hyun Kim, Song Liu
The objective of this study was to develop and characterize a novel intravaginal membrane platform for pH-triggered release of nanoparticles (NPs), which is essential for efficient intravaginal delivery of certain effective but acid-labile therapeutic agents for sexually transmitted infections, such as small interfering RNA (siRNA). pH-responsive polyurethane (PU) was electrospun into a porous nanofibrous membrane. The diameters of the fibers, as well as the thickness and pore sizes of the membrane under dry and wet conditions (pH 4...
October 5, 2018: Acta Biomaterialia
Tarnveer S Bhamra, Brian J Tighe, Jiffan Li
This paper presents three families of semi-interpenetrating polymer network (SIPN) hydrogels based on an ester-based polyurethane (EBPU) and hydrophilic monomers: N,N-dimethylacrylamide (NNDMA), N-vinyl pyrrolidone (NVP) and acryloylmorpholine (AMO) as potential materials for keratoprosthesis, orthokeratology and mini-scleral lens application. Hydrogels sheets were synthesized via free-radical polymerization with methods developed in-house. SIPN hydrogels were characterized for their equilibrium water content, mechanical and surface properties...
October 8, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
E R Silva, O Ferreira, P A Ramalho, N F Azevedo, R Bayón, A Igartua, J C Bordado, M J Calhorda
Environmental concerns have been changing the way of looking for solutions to problems. The hydrosphere, together with its biosphere, has been feeling the impact of many pollutants, used for instance in the marine industry for economic reasons or lack of knowledge of their effects. In particular biocides, applied as coatings in paints, are released into the waters becoming toxic and persistent extending their action to an area far beyond the initial coated surface they should protect. In order to minimize these side effects, two biocides, Irgarol (I) and Econea (E), were covalently attached to polyurethane (PU) and foul-release silicone based (PDMS) marine paints through an isocyanate linker...
October 2, 2018: Science of the Total Environment
Andrea Steinmetz, Ulrike Jörn, Gerhard U Oechtering, Romy M Heilmann
OBJECTIVE: The aim of the study was to determine the lacrimal fluid (LF) contents of glucose, urea nitrogen, and creatinine in cats. ANIMAL STUDIED: A total of 96 cats were included in the study. PROCEDURE: Venous blood and LF samples were collected. For LF sampling, three small polyurethane sponges were placed in the ventral fornix of both eyes. Both LF and plasma concentrations of glucose, urea nitrogen, and creatinine were quantitatively analyzed and compared...
October 5, 2018: Veterinary Ophthalmology
Jeremiah Wasserlauf, Taiki Esheim, Natasha M Jarett, Eric K Y Chan, Robert D Schaller, Fermin C Garcia, Bradley P Knight
BACKGROUND: Electrocautery (cautery) can damage transvenous cardiac device leads. The purpose of this study was to compare lead damage from an insulated cautery blade when used with several different techniques that included coagulation (COAG) vs. cutting (CUT) mode, perpendicular active-edge (active) vs. parallel flat-blade (flat) orientation (phase 1), and using one commercially-available blade (PhotonBlade) versus another (PlasmaBlade) (phase 2). METHODS: In phase 1, lesions were delivered using combinations of: (1) COAG and CUT, (2) active and flat orientation, and (3) polyurethane, silicone, and copolymer insulation...
October 5, 2018: Pacing and Clinical Electrophysiology: PACE
Nuno Vasco Gama, Cláudia Amaral, Tiago Silva, Romeu Vicente, João Araújo Pereira Coutinho, Ana Barros-Timmons, Artur Ferreira
The aim of this study was to enhance the thermal comfort properties of crude glycerol (CG) derived polyurethane foams (PUFs) using phase change materials (PCMs) (2.5⁻10.0% ( wt/wt )) to contribute to the reduction of the use of non-renewable resources and increase energy savings. The main challenge when adding PCM to PUFs is to combine the low conductivity of PUFs whilst taking advantage of the heat released/absorbed by PCMs to achieve efficient thermal regulation. The solution considered to overcome this limitation was to use expandable graphite (EG) (0...
October 4, 2018: Materials
Rejiane da Rosa Schio, Bruno C da Rosa, Janaína O Gonçalves, Luiz A A Pinto, Evandro S Mallmann, Guilherme L Dotto
A novel bio-based polyurethane/chitosan foam (PU/chitosan) was synthesized using a polyol derived from castor oil and applied to remove Food Red 17 dye (FR17) from aqueous solutions. PU/chitosan foam presented better characteristics and adsorption potential than polyurethane foam (PU). PU/chitosan foam showed a semi-crystalline structure, with several functional groups, high porosity and good mechanical properties. These characteristics are adequate for adsorptive separations. Using identical adsorption conditions, PU/chitosan was able to remove >98% of FR17 dye from the solution, while, PU removed only 40%...
October 1, 2018: International Journal of Biological Macromolecules
F Carosio, M Ghanadpour, J Alongi, L Wågberg
The layer-by-layer (LbL) assembly of chitosan (CH) and phosphorylated cellulose nanofibrils (P-CNF) is presented as a novel, sustainable and efficient fire protection system for polyurethane foams. The assembly yields a linearly growing coating where P-CNF is the main component and is embedded in a continuous CH matrix. This CH/P-CNF system homogenously coats the complex 3D structure of the foam producing a nano-exoskeleton that displays excellent mechanical properties increasing the modulus of the foam while maintaining its ability of being cyclically deformed...
December 15, 2018: Carbohydrate Polymers
Ludovica Cacopardo, Nicole Guazzelli, Roberta Nossa, Giorgio Mattei, Arti Ahluwalia
The aim of this study was to identify a method for modifying the time-dependent viscoelastic properties of gels without altering the elastic component. To this end, two hydrogels commonly used in biomedical applications, agarose and acrylamide, were prepared in aqueous solutions of dextran with increasing concentrations (0%, 2% and 5% w/v) and hence increasing viscosities. Commercial polyurethane sponges soaked in the same solutions were used as controls, since, unlike in hydrogels, the liquid in these sponge systems is poorly bound to the polymer network...
September 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Long Fei Fan, Min Zhi Rong, Ming Qiu Zhang, Xudong Chen
To enable repeated intrinsic self-healing of wider crack in polymers, a proof-of-concept approach is verified in the present work. It operates through two-way shape memory effect (SME) aided intrinsic self-healing. Accordingly, reversible C-ON bond is introduced to the main chain of crosslinked polyurethane (PU) containing elastomeric dispersed phase (styrene-butadiene-styrene block copolymer, SBS). The PU/SBS blend was developed by the authors recently, and proved to possess external stress-free two-way SME after programming...
October 4, 2018: ACS Applied Materials & Interfaces
Ruowang Chen, Xiaowei Zhang, Pengjun Wang, Kaihe Xie, Jiawen Jian, Yuejun Zhang, Jingrong Zhang, Yulian Yuan, Pudan Na, Mingqiang Yi, Jun Xu
Particulate matter (PM) air pollution has been established as a significant threat to the public health and a destructive factor to the climate and eco-systems. In order to eliminate the effects of PM air pollution, various air filtering strategies based on electrospun nanofibers have been developed recently. However, to date, almost none of the existing nanofibers based air filters can meet the requirements of high-performance air PM filtering, including high PM removal efficiency, low resistance to air flow, and long service life etc...
October 4, 2018: Nanotechnology
Yeap Hung Ng, Siok Wei Tay, Liang Hong
Development of an anti-icing surface on a desired industrial coating patch/object has been the persistent challenge to several industries, such as aviation and wind power. For this aim, performing surface modification to implement the ice-phobic property on existing commercial coatings is important for practical applications. This work accomplishes an icephobic coating overlying a PPG aerospace polyurethane (PU) coating. It manifests a clear capability to delay formation of frost as well as to reduce adhesion strength of ice...
October 4, 2018: ACS Applied Materials & Interfaces
Akihide Kondo, Osamu Akiyama, Mario Suzuki, Hajime Arai
Background: The effectiveness of microvascular decompression in treating hemifacial spasm is widely accepted. However, some experience recurrence of hemifacial spasm after successful decompression surgery. Especially, delayed recurrence more than 5 years after surgery is rare and the cause of this phenomenon is unknown. Case Description: A female underwent microvascular decompression to treat her hemifacial spasm 6 years ago. Six years later, her hemifacial spasm recurred and she underwent a second surgery...
2018: Surgical Neurology International
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