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large pore mesh

Ronak Dholakia, Chandramouli Sadasivan, David Fiorella, Henry Woo, B Barry Lieber
Cerebral aneurysms are pathological focal evaginations of the arterial wall at and around the junctions of the circle of Willis. Their tenuous walls predispose aneurysms to leak or rupture leading to hemorrhagic strokes with high morbidity and mortality rates. The endovascular treatment of cerebral aneurysms currently includes the implantation of fine-mesh stents, called flow diverters, within the parent artery bearing the aneurysm. By mitigating flow velocities within the aneurysmal sac, the devices preferentially induce thrombus formation in the aneurysm within hours to days...
October 11, 2016: Journal of Biomechanical Engineering
Jaime Andres Perez-Taborda, Miguel Muñoz Rojo, Jon Maiz, Neophytos Neophytou, Marisol Martin-Gonzalez
In this work, we measure the thermal and thermoelectric properties of large-area Si0.8Ge0.2 nano-meshed films fabricated by DC sputtering of Si0.8Ge0.2 on highly ordered porous alumina matrices. The Si0.8Ge0.2 film replicated the porous alumina structure resulting in nano-meshed films. Very good control of the nanomesh geometrical features (pore diameter, pitch, neck) was achieved through the alumina template, with pore diameters ranging from 294 ± 5nm down to 31 ± 4 nm. The method we developed is able to provide large areas of nano-meshes in a simple and reproducible way, being easily scalable for industrial applications...
2016: Scientific Reports
S Harsløf, N Zinther, T Harsløf, C Danielsen, P Wara, H Friis-Andersen
PURPOSE: The choice of mesh and anchoring device in laparoscopic ventral hernia repair is controversial. Clinically important long-term properties of mesh and anchoring device such as mesh shrinkage have been sparsely investigated. Furthermore, the effect of various anchoring devices on mesh properties has never been examined. METHODS: In 20 sheep, using laparoscopy, we inserted three PhysiomeshTM (large pore, lightweight) and three VentralightTMST (small pore, mediumweight), anchored with ProTackTM, SecurestrapTM or GlubranTM, respectively...
August 11, 2016: Hernia: the Journal of Hernias and Abdominal Wall Surgery
Charles P Shahan, Nathaniel N Stoikes, Esra Roan, James Tatum, David L Webb, Guy R Voeller
BACKGROUND: Non-penetrating mesh fixation is becoming widely accepted even though little is known about the short-term fixation strength of these techniques. Although clinical outcomes are the ultimate measure of effectiveness, ex vivo biomechanical evaluation provides insights about the load-carrying capacity of the mesh-tissue complex in vivo. As such, the purpose of this study was to compare the short-term fixation strength of three unique non-penetrating methods of fixation: LifeMesh™, ProGrip™, and Tisseel™...
July 21, 2016: Surgical Endoscopy
Chao Deng, Jiong Ma, Heiying Jin, Wei Gong, Shuiming Wang, Hao Chen, Yimei Fan, Qinglan Yang
OBJECTIVE: To explore the application of a novel device of collecting large amount of fecal mucosa for detecting the DNA methylation and screening colorectal cancer. METHODS: Preoperative complete fecal sample and surgical specimen of 10 patients with colorectal cancer, and complete fecal sample and normal bowel mucosal samples confirmed by colonoscopy of 6 hospitalization cases at The Third Affiliated Hospital, Nanjing University of TCM from March to April 2014 were collected...
June 2016: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
Michelle Kelly, Katherine Macdougall, Oluwafisayo Olabisi, Neil McGuire
INTRODUCTION AND HYPOTHESIS: Polypropylene is a material that is commonly used to treat pelvic floor conditions such as pelvic organ prolapse (POP) and stress urinary incontinence (SUI). Owing to the nature of complications experienced by some patients implanted with either incontinence or prolapse meshes, the biocompatibility of polypropylene has recently been questioned. This literature review considers the in vivo response to polypropylene following implantation in animal models. The specific areas explored in this review are material selection, impact of anatomical location, and the structure, weight and size of polypropylene mesh types...
May 23, 2016: International Urogynecology Journal
Manuel López-Cano, Xavier Serra-Aracil, Laura Mora, José Luis Sánchez-García, Luis Miguel Jiménez-Gómez, Marc Martí, Francesc Vallribera, Domenico Fraccalvieri, Anna Serracant, Esther Kreisler, Sebastiano Biondo, Eloy Espín, Salvador Navarro-Soto, Manuel Armengol-Carrasco
OBJECTIVE: The aim of this study was to assess the reduction in the incidence of parastomal hernia (PH) after placement of prophylactic synthetic mesh using a modified Sugarbaker technique when a permanent end-colostomy is needed. SUMMARY OF BACKGROUND DATA: Prevention of PH formation is crucial given the high prevalence of PH and difficulties in the surgical repair of PH. METHODS: A randomized, prospective, double-blind, and controlled trial...
March 8, 2016: Annals of Surgery
Filip E Muysoms, Olivier Detry, Tijl Vierendeels, Marc Huyghe, Marc Miserez, Martin Ruppert, Tim Tollens, Jean-Olivier Defraigne, Frederik Berrevoet
BACKGROUND: The incidence of incisional hernias after abdominal aortic aneurysm repair is high. Prophylactic mesh-augmented reinforcement during laparotomy closure has been proposed in patients at high risk of incisional hernia. METHODS: A multicenter randomized trial was conducted on patients undergoing elective abdominal aortic aneurysm repair through a midline laparotomy ( NCT00757133). In the study group, retromuscular mesh-augmented reinforcement was performed with a large-pore polypropylene mesh (Ultrapro, width 7...
April 2016: Annals of Surgery
Claudio Birolini, Jocielle Santos de Miranda, Edivaldo Massazo Utiyama, Samir Rasslan, Dario Birolini
INTRODUCTION: The management of chronic mesh infection is challenging and controversial. The use of synthetic material to repair the abdominal wall in the infected setting is not recommended, especially in the presence of active infection caused by Staphylococcus aureus. METHODS: This is a prospective observational study designed to evaluate the outcomes in patients with active mesh infection caused by Staphylococcus aureus. Patients underwent simultaneous removal and replacement of polypropylene mesh...
April 2016: International Journal of Surgery
Kenny W Q Low, Raoul van Loon, Samuel A Rolland, Johann Sienz
This paper reviews and further develops pore-scale computational flow modeling techniques used for creeping flow through orthotropic fiber bundles used in blood oxygenators. Porous model significantly reduces geometrical complexity by taking a homogenization approach to model the fiber bundles. This significantly simplifies meshing and can avoid large time-consuming simulations. Analytical relationships between permeability and porosity exist for Newtonian flow through regular arrangements of fibers and are commonly used in macroscale porous models by introducing a Darcy viscous term in the flow momentum equations...
May 2016: Journal of Biomechanical Engineering
Kang-Ting Huang, Shiou-Bang Yeh, Chun-Jen Huang
A facile yet effective surface modification strategy for superhydrophilicity and underwater superoleophobicity was developed by silanization of zwitterionic sulfobetaine silane (SBSi) on oxidized surfaces. The coatings exhibit excellent wetting properties, as indicated by static contact angles of <5°, and long-term stability under exposure to heat and UV irradiation. The SBSi-modified surfaces were employed for applications in antifog, self-cleaning, and oil-water separation. The SBSi glasses retained their optical transmittance because of the rapid formation of coalesced water thin films on surfaces in contact with water vapor and moisture...
September 30, 2015: ACS Applied Materials & Interfaces
N Merali, R A R Almeida, A Hussain
INTRODUCTION: We present a case on conservative management of salvaging the mesh in an immunocompromised morbidly obese patient, who developed a synergistic gangrene infection following a primary open mesh repair of an incisional hernia. PRESENTATION OF CASE: Our patient presented with a surgical wound infection, comorbidities were Chronic Lymphoblastic Leukemia (CLL), Body Mass Index (BMI) of 50, hypertension and diet controlled type-2 diabetes. In surgery, wide necrotic wound debridement, early and repetitive wound drainages with the use of a large pore polypropylene mesh and a detailed surgical follow up was required...
2015: International Journal of Surgery Case Reports
Dirk Weyhe, William Cobb, Julie Lecuivre, Antoine Alves, Sebastien Ladet, Davide Lomanto, Yves Bayon
BACKGROUND: Prosthetic mesh implants in hernia repair are frequently used based on the fact that lower recurrence rates are detected. However, an undesirable side effect is persistent foreign body reaction that drives adhesions and shrinkage among other things in the course of time. Thereby a variety of meshes have been created in an attempt to alleviate these side effects, and particular relating to shrinkage, the ideal mesh has not been developed. Large pore size is one of the properties to get better ingrowth of the implants but could also be a risk factor to shrinkage behavior...
October 2015: International Journal of Surgery
Sandra Barbosa, Tania Nieves, Félix García, Eva Cepeda, Xavier Moll, Alberto Marco, Christine Weis, Pau Turon, Patri Vergara
OBJECTIVE: The aim of this study was to find a proper experimental design and to evaluate n-butyl-2-cyanoacrylate (Histoacryl) as a fixation method for a light-weight and large pore PP mesh (Synthetic PP Mesh-1) using the sheep as an animal model. METHODS: Posterior vaginal implantation by means of episiotomy was used to implant 8 ewes which were evaluated macroscopically and histologically at 3 months (n = 4) and 6 months (n = 4) post-surgery. In previous pilot studies anterior vaginal implantation was evaluated, as well as different synthetic mesh materials, sizes and fixation methods (n = 1 to 3) during three weeks...
2015: BioMed Research International
Qingjie Sun, Min Wu, Xianghui Bu, Liu Xiong
Effects of added wheat fiber, with different levels and particle sizes, on the physicochemical properties and gel morphology of wheat starch and mung bean starch were investigated, using rapid visco analyzer (RVA), texture analyzer (TPA) and scanning electron microscopy (SEM). Each starch was added with wheat fiber at 10, 20, 30 and 40% (weight basis, g/100g), and different sizes of 60, 100 and 180 mesh, respectively. The peak viscosity (PV) of starches with wheat fiber were higher than the control. Starches had the highest PV with 40%, 60 mesh wheat fiber...
2015: PloS One
Kathryn Futrega, James S Palmer, Mackenzie Kinney, William B Lott, Mark D Ungrin, Peter W Zandstra, Michael R Doran
Microwell platforms are frequently described for the efficient and uniform manufacture of 3-dimensional (3D) multicellular microtissues. Multiple partial or complete medium exchanges can displace microtissues from discrete microwells, and this can result in either the loss of microtissues from culture, or microtissue amalgamation when displaced microtissues fall into common microwells. Herein we describe the first microwell platform that incorporates a mesh to retain microtissues within discrete microwells; the microwell-mesh...
September 2015: Biomaterials
O Iu Ioffe, I M Shvets', O P Stetsenko, Iu P Tsiura, T V Tarasiuk, V P Lamashevs'kyĭ, I V Makovets'kyĭ, Iu O Furmanov
The aim of the study is to examine in the experiment on the animals the mechanical properties of connective tissue complexes formed in alloplasty area using the intraperitoneal on lay mesh and sublay methodologies with further comparison of them. The experiment has been conducted on 12 rabbits of Russian chinchilla breed. Animals were distributed in the following way: the first group--operated by intraperitoneal on lay mesh methodology (n = 6) through implantation of composite grid Proceed with one-side celullose coating produced by "Ethicon" company...
May 2014: Likars'ka Sprava
E Reynvoet, K Chiers, I Van Overbeke, R Troisi, F Berrevoet
PURPOSE: Although clinical data on long-term efficacy are lacking, the use of self-expanding devices for intraperitoneal placement in the management of small midline hernias has been popularized. In the present experimental study, two different devices were investigated regarding tissue ingrowth, adhesion formation and solid mesh placement. METHODS: Two devices of 4.3 cm diameter, one ePTFE-containing small pore polypropylene mesh (PP/ePTFE) and a multi-layered large-pore polypropylene patch with an oxidized cellulose anti-adhesive barrier (PP/ORC), both containing a self-deployment system, were placed intraperitoneally at the linea alba of 24 female pigs...
December 2015: Hernia: the Journal of Hernias and Abdominal Wall Surgery
David J Hardy, Zhe Wu, James C Phillips, John E Stone, Robert D Skeel, Klaus Schulten
The multilevel summation method (MSM) offers an efficient algorithm utilizing convolution for evaluating long-range forces arising in molecular dynamics simulations. Shifting the balance of computation and communication, MSM provides key advantages over the ubiquitous particle–mesh Ewald (PME) method, offering better scaling on parallel computers and permitting more modeling flexibility, with support for periodic systems as does PME but also for semiperiodic and nonperiodic systems. The version of MSM available in the simulation program NAMD is described, and its performance and accuracy are compared with the PME method...
February 10, 2015: Journal of Chemical Theory and Computation
Johan Styrke, Markus Johansson, Gabriel Granåsen, Leif Israelsson
OBJECTIVE: There are no data on the frequency of parastomal hernia (PSH) after ileal conduit with a prophylactic mesh. The primary objective of this study was to determine the prevalence of PSH. Secondary objectives were to elaborate whether age, gender, body mass index (BMI), previous laparotomy or diabetes influenced the outcome; and to find any mesh-related complications. MATERIALS AND METHODS: In a single centre during 2003-2012, a large-pore, lightweight mesh was placed in a sublay position in 114 consecutive patients with ileal conduits...
2015: Scandinavian Journal of Urology
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