In this paper we describe the development of an interactive virtual reality (VR) system that aims to realistically simulate specific paracentesis clinical procedures (particularly the procedure involved in the catheterization of the subclavian vein). A simplified elasto-static finite element model is used for the physically based simulation of the deformable tissues, particularly skin deflectio...

Introduction In percutanous MR-guided interventions passive markers are used to delineate the position or the trajectory of rigid instruments. In particular, for linear instruments such as puncture needles cylindrical markers are favorable, as the instrument can be safely accommodated in their interior. Cylindrical markers can be localized rapidly if their approximate position is known [1]; how...

The two current criteria for diagnosis of left anterior fascicular block (LAFB) were evaluated; they are marked left axis deviation (LAD) and a delay in the time of inscription of the intrinsicoid deflection (ID) in lead aVL asynchronous to V6. From 400 electrocardiograms with a LAD of --30 degrees or greater, 62 percent showed asynchronous activation of the left ventricle. There was only a gen...

In an effort to reduce the incidence of decubitus ulcers among wheelchair users, current work in cushion design concentrates on minimizing the pressure at the buttock-cushion interface. Finite element analysis can show the stress levels throughout the soft tissue between the cushion and the ischial tuberosity and give designers a better indication of the effects of a particular cushion. Finite ...

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In order to improve the service life of needle roller bearing used in a precision cycloid reducer, and reveal skew collision phenomenon bearing, based on force analysis transmission mechanism reducer considering friction between wheel, roller, cage, crank shaft, dynamic contact rolling bodies is simulated by Hertz elastic contact, where cage pocket hole equivalent spring damping, nonlinear mode...

This work studies the control of a pneumatic actuator for needle insertion in soft tissue without using axial rotation or additional supports. Employing simplified rigid-link model description an axial-symmetric tip supported at base, two energy shaping controllers are proposed. The friction forces compensated adaptively and stability conditions closed-loop equilibrium discussed. compared by me...

statement of problem: t-loop is one of the most popular closing loops in orthodontic profession. however its activation is in the contrary to bouschinger effect theory, since the formed bends would be opened during activation. the purpose of this study was to add a helix in a way to be more respondent to the bouschinger effect theory. objectives: to compare the load deflection, maximal elastic ...

OBJECTIVES/HYPOTHESIS To develop a reliable and safe laryngeal nerve conduction technique and to obtain consistent parameters as normal reference values. STUDY DESIGN A prospective single-arm study. METHODS A nerve conduction test was performed on the contralateral normal side in 42 patients with unilateral vocal fold palsy. The recording was performed in the intact thyroarytenoid muscle us...

background: good cytological sample is very important for the cytological diagnosis of thyroid nodules. the aim of this study was to evaluate the adequacy of prepared samples by the combination of aspiration and non- aspiration fine needle biopsy. methods: in this descriptive – analytical study, sampling was done simultaneously for each patient in fine needle aspiration and non-aspiration biops...