Titel Deelnemers "Korte inhoud" "Perforator Mapping Practice for Deep Inferior Epigastric Artery Perforator Flap Reconstructions" "Vivian B Boer, Carolien F Wever, Michiel R Beets, Pauline D Verhaegen, Moustapha Hamdi" "BACKGROUND:  Numerous new and novel imaging techniques for preoperative perforator selection in deep inferior epigastric artery perforator (DIEP) flap planning have been introduced. To what extent, these have been adopted into or replaced routine practice has hitherto remained unknown. The purpose of this study was to identify the currently preferred technique by reconstructive surgeons, the criteria that they regard as most relevant and what impact these have on the preoperative decision-making.METHODS:  An online survey consisting of 25 questions was sent to members of the Benelux Societies for Plastic Surgery. Information regarding experience and preferred imaging modality was requested. Specific questions addressed the utilization of computed tomography angiography (CTA) and factors that could inform preoperative perforator selection. Results were anonymously collected, managed using REDCap, and analyzed using Chi-square statistic.RESULTS:  Seventy-nine principal surgeons could be included. A variation in surgeon experience was observed. On CTA, the preferred imaging modality, large-caliber vessels, the location of the perforator in the flap, and its intramuscular course were considered the most significant criteria. Surgeons doing more than 20 DIEP flaps per year are less concerned about the distance of the perforator from the umbilicus (p = 0.003) but more likely to choose a medial perforator (p = 0.011). No statistical difference was found in surgeons' experience between those who would choose and use one specific (medial or lateral) perforator when they are analogous on CTA, and those who would delay the decision until both perforators have been exposed.CONCLUSION:  Advantages and disadvantages of the current practice of preoperative perforator selection by surgeons who are primarily responsible for harvesting a DIEP flap have been clearly identified. Indications are that these could be widely representative in which case, the quest for a protocol or modality that maximizes the benefit and minimizes harm in preoperative perforator mapping is urgently required." "CORRECTOR HOMOGENIZATION ESTIMATES FOR A NON-STATIONARY STOKES-NERNST-PLANCK-POISSON SYSTEM IN PERFORATED DOMAINS" "Vo ANH-KHOA, A. Muntean" "We consider a non-stationary Stokes-Nernst-Planck-Poisson system posed in perforated domains. Our aim is to justify rigorously the homogenization limit for the upscaled system derived by means of two-scale convergence in [N. Ray, A. Muntean, and P. Knabner, J. Math. Anal. Appl., 390(1):374-393, 2012]. In other words, we wish to obtain the so-called corrector homogenization estimates that specify the error obtained when upscaling the microscopic equations. Essentially, we control in terms of suitable norms differences between the micro-and macro-concentrations and between the corresponding micro- and macro-concentration gradients. The major challenges that we face are the coupled flux structure of the system, the nonlinear drift terms and the presence of the microstructures. Employing various energy-like estimates, we discuss several scalings choices and boundary conditions." "Clinical applications of the superior epigastric artery perforator (SEAP) flap: anatomical studies and preoperative perforator mapping with multidetector CT." "Moustapha Hamdi, K. Van Landuyt, S. Ulens, E. Van Hedent, N. Roche, Geen naam beschikbaar" "Background: Pedicled superior epigastric artery perforator (SEAP) flaps can be raised to cover challenging thoracic defects. We present an anatomical study based on multidetector computerized tomography (MDCT) scan findings of the SEA perforators in addition to the first reported clinical series of SEAP flaps in anterior chest wall reconstruction. Material and methods: (a) In the CT scan study, images of a group of 20 patients who underwent MDCT scan analysis were used to visualise bilaterally the Location of musculocutaneous SEAP. X- and Y-axes were used as landmarks to localise the perforators. The X-axis is a horizontal line at the junction of sternum and xyphoid (JCX) and the Y-axis is at the midline. (b) In the clinical study, seven pedicled SEAP flaps were performed in another group of patients. Results: MDCT images revealed totally 157 perforators with a mean of 7.85 perforators per patient. The dominant perforators (137 perforators) were mainly localised in an area between 1.5 and 6.5 cm from the X-axis on both sides and between 3 and 16 cm below the Y-axis. The calibre of these dominant perforators was judged as 'good' to 'very good' in 82.5% of the cases. The average dimension of the flap was 21.7 x 6.7 cm. ALL flaps were based on one perforator. Mean harvesting time was 110 min. There were no flap Losses. Minor tip necrosis occurred in two flaps. One of them was treated with excision and primary closure. Conclusion: Our clinical experience indicates that the SEAP flap provides a novel and useful approach for reconstruction of anterior chest wall defects. CT-based imaging allows for anatomical assessment of the perforators of the superior epigastric artery (SEA)." "Technical tips for safe perforator vessel dissection applicable to all perforator flaps" "Anne Dancey, Phillip Blondeel" "Clinical applications of the superior epigastric artery perforator (SEAP) flap: anatomical studies and preoperative perforator mapping with multidetector CT" "Moustapha Hamdi, Koenraad Van Landuyt, Sara Ulens, Eddy Van Hedent, Nathalie Roche" "Enabling backside processing for perforated microfluidic devices" "Aurelie Humbert, Yang Han, Chi Dang Thi Thuy, Lan Peng, Serge Vanhaelemeersch" "In this work, we review various methods for surface protection of perforated microfluidic devices. Among these methods, applications of adhesive tape and polymer coating have shown fundamental limitations for preserving device integrity. It is also revealed that conventional temporary bonding process incorporating wafer carrier and temporary bonding material (TBM) poses a major risk to microchannels-based devices. Furthermore, three approaches are evaluated to improve effectiveness of removal of TBM. The first approach uses a solvent spray process, which shows significant TBM residues after extensive cleaning. The second approach employs a mechanical peeling process to remove the bulk of TBM followed by a short-wet cleaning. The third approach utilizes a dry film resist (DFR) as an intermediate layer between the TBM and perforated wafer surface, resulting in a more efficient cleaning process and complete removal of TBM residues." "Hartmann's procedure versus sigmoidectomy with primary anastomosis for perforated diverticulitis with purulent or faecal peritonitis (LADIES): a multicentre, parallel-group, randomised, open-label, superiority trial" "Albert Wolthuis" "BACKGROUND: Previous studies have suggested that sigmoidectomy with primary anastomosis is superior to Hartmann's procedure. The likelihood of stoma reversal after primary anastomosis has been reported to be higher and reversal seems to be associated with lower morbidity and mortality. Although promising, results from these previous studies remain uncertain because of potential selection bias. Therefore, this study aimed to assess outcomes after Hartmann's procedure versus sigmoidectomy with primary anastomosis, with or without defunctioning ileostomy, for perforated diverticulitis with purulent or faecal peritonitis (Hinchey III or IV disease) in a randomised trial. METHODS: A multicentre, randomised, open-label, superiority trial was done in eight academic hospitals and 34 teaching hospitals in Belgium, Italy, and the Netherlands. Patients aged between 18 and 85 years who presented with clinical signs of general peritonitis and suspected perforated diverticulitis were eligible for inclusion if plain abdominal radiography or CT scan showed diffuse free air or fluid. Patients with Hinchey I or II diverticulitis were not eligible for inclusion. Patients were allocated (1:1) to Hartmann's procedure or sigmoidectomy with primary anastomosis, with or without defunctioning ileostomy. Patients were enrolled by the surgeon or surgical resident involved, and secure online randomisation software was used in the operating room or by the trial coordinator on the phone. Random and concealed block sizes of two, four, or six were used, and randomisation was stratified by age (" "Analysis of perforated magnetic shields for electric power applications" "Ruth Vazquez Sabariego" "The shielding performance of perforated magnetic shields for electric power applications is described. The shielding of an axisymmetric induction heating device is studied as a function of frequency, number of perforations and dimensions of the perforations. From the numerical point of view, the perforations cause the numerical model to be 3D. A numerical optimisation is carried out to find the optimal geometry with respect to the shielding factor and the volume of the shield. For the optimisation, two approaches are presented. The first approach is fast and easy-to-implement, but has limited accuracy. It uses a classical 2D axisymmetric model where the perforations are approximated by ‘axisymmetric air gaps’ resulting in a segmented shield. It is shown how to modify the 2D model to obtain results that are similar to the ones of a 3D model. The second approach is more accurate although quite fast, but more difficult to implement. It combines a 3D thin- shell finite element model with the unmodified 2D model in a space mapping optimisation algorithm. The validation of both models is based on experimental work for an unperforated shield and for the optimised perforated shield." "Laparoscopic peritoneal lavage or sigmoidectomy for perforated diverticulitis with purulent peritonitis: a multicentre, parallel-group, randomised, open-label trial" "André D'Hoore" "Case series suggest that laparoscopic peritoneal lavage might be a promising alternative to sigmoidectomy in patients with perforated diverticulitis. We aimed to assess the superiority of laparoscopic lavage compared with sigmoidectomy in patients with purulent perforated diverticulitis, with respect to overall long-term morbidity and mortality." "Radiation Characteristics of Small Loop Antenna above Perforated Finite Image Plane" "Raul Blecic, Bart Nauwelaers" "© 2015 IEEE. Radiation characteristics of a loop antenna, small compared to the wavelength and placed centrally above a perforated finite image plane, are presented. Holes in the image plane typically occur in a multilayer printed circuit boards (PCBs) when vias pass through the second layer which serves as a reflector. A 3D finite element method (FEM) electromagnetic (EM) simulation of a System-in-Package (SiP) synchronous buck converter shows a significant impact of the holes on the characteristics of the converter. A parametric analysis of the impact of the number and radius of holes on the radiated characteristics and on the inductance of a small loop antenna above perforated image plane is performed by 3D FEM EM simulations. Guidelines for a design of multilayer PCBs for magnetically driven sources, such as DC-DC converters, are deduced."