Dersleri yüzünden oldukça stresli bir ruh haline sikiş hikayeleri bürünüp özel matematik dersinden önce rahatlayabilmek için amatör pornolar kendisini yatak odasına kapatan genç adam telefonundan porno resimleri açtığı porno filmini keyifle seyir ederek yatağını mobil porno okşar ruh dinlendirici olduğunu iddia ettikleri özel sex resim bir masaj salonunda çalışan genç masör hem sağlık hem de huzur sikiş için gelip masaj yaptıracak olan kadını gördüğünde porn nutku tutulur tüm gün boyu seksi lezbiyenleri sikiş dikizleyerek onları en savunmasız anlarında fotoğraflayan azılı erkek lavaboya geçerek fotoğraflara bakıp koca yarağını keyifle okşamaya başlar
GET THE APP
Parametric Designs Based On CFD For A New Generation Of Ventricular Catheters For Hydrocephalus | 63900
ISSN: 2155-952X
Journal of Biotechnology & Biomaterials
Open Access
Our Group organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.
Background: To drain the excess of cerebrospinal fluid in a hydrocephalus patient, a catheter is inserted in one of the brain ventricles,
and then connected to a valve. This so-called ventricular catheter is a standard-size, flexible tubing with a number of holes placed
symmetrically around several transversal sections or “drainage segments”. Three-dimensional computational dynamics shows that
most of the fluid volume flows through the drainage segment closest to the valve. This fact raises the likelihood that those holes and
then the lumen get clogged by the cells and macromolecules present in the cerebrospinal fluid, provoking malfunction of the whole
system.
Objective: To better understand the flow pattern, we have carried out a parametric study via numerical models of ventricular catheters.
Methods: The parameters chosen are the number of drainage segments, the distances between them, the number and diameter of the
holes on each segment, as well as their relative angular position.
Results: These parameters were found to have a direct consequence on the flow distribution and shear stress of the catheter. As a
consequence, we formulate general principles for ventricular catheter design. To exclude the drainage area of the segments from the
set of parameters, the drainage areas of the distal segment, and the proximal segment, were conveniently chosen in each group, while
the drainage areas of the remaining segments.
Conclusions: These principles can help develop new catheters with homogeneous flow patterns thus possibly extending their lifetime.