Publications by Simon Nessim Henein

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Retinal vein occlusion (RVO) is a major cause of vision loss in patients over 50 years old. RVO can be treated by cannulation of the retinal vein to remove clots. However, cannulation of small retinal veins is challenging as the required puncture force (~10 mN) is well below human sensing capability [1]. In this paper, we introduce a passive compliant tool for retinal vein cannulation having predetermined stroke and threshold force which allows safe and precise puncturing independent of actuation input. Our

Depuis son introduction en 1675, le balancier-spiral est la base de temps exclusive de la montre mécanique. Or cet oscillateur présente deux difficultés limitatives qui n'ont jusqu'à présent pas été contournées : un facteur de qualité limité (en particulier par des phénomènes tribologiques), ainsi que la nécessité d'un échappement, mécanisme complexe au rendement limité. Cet article pré-sente un nouvel oscillateur appelé IsoSpring, qui améliore le facteur de qualité grâce au recours aux guidages flexibles e

In this paper, we present a new flexure-based load cell with adjustable stiffness designed for force sensors with extended force range and respective measuring resolution. This novel monolithic mechanism consists of a T-shaped flexure pivot combined with a ...

This paper starts by presenting several examples of original flexible bearings and flexible articulated structures having 1 to 6 degrees of freedom to illustrate how flexures can soundly be used in high precision robotics. Then, the influence of the electrodischarge machining process of the joint's surfaces is discussed. Finally, an original setup for the fatigue testing of small flexures is briefly described.

This paper presents the design of a flexure based focusing system, part of the Close-Up Imager (CLUPI) instrument which is planned to be integrated on the future ExoMars NASA-ESA Mars Rover to be launched in 2018. Various design trade-offs are discussed, i ...

Mechanical oscillator (1) for a timepiece comprising an inertial mass (3) arranged to oscillate about a neutral position under the effect of a restoring force provided by at least one elastic element (5),characterised in that said mechanical oscillator (1) ...

This paper describes a detailed study of the behavior of the parallel spring stage having four circular flexure hinges of very thin cross-sections manufactured by wire electro-discharge machining. The state of the art recalls the abundant literature published on the parallel leaf spring stage, and presents the few articles found dealing with the parallel spring stages. The theoretical modeling for the calculation of the linear stiffness of the parallel spring stage is described. The starting point of the di

This article presents a test setup dedicated to the measurement of the 6 degrees of freedom relative positioning assembly repeatability of three micro-manufactured parts equivalent to those composing a mesoscale flexure-based robot. The typical size of the ...

Mechanical oscillator (10) comprising an inertial body (101) joined to a support (100) by means of an elastic system (102, 103, 104, 105, 106, 107) arranged to provide the inertial body (101) with substantially no degrees of freedom in translation and with ...

A horological detent escapement for a horological movement arranged to transmit a torque from said horological movement to an oscillating regulating organ of said horological movement, the regulating organ comprising a first mobile body and the escapement ...

This paper introduces two courses making use of performing arts at university level. The first course, taught by Prof. Simon Henein and his colleagues, called Improgineering, aims to teach collective creation through improvisation to master’s degree studen ...

This paper presents the mechanical slit mask designed for the Near Infrared Spectrograph of the James Webb Space Telescope. This mechanism is designed to function at a cryogenic temperature of 30K, in vacuum. The reconfigurable mask allows to form 24 optical slits in a 137 x 137 mm2 field of view. The slit length is fixed (4.8 mm) and their width can range from 50 μm to 137 mm. The slit positioning accuracy is ± 5 μm and the slit width accuracy is ± 8 μm. The paper concentrates on the working principle of t

Horological oscillator comprising: - a first inertial body (141; 151; 1305; 1405; 1505; 301; 311; 314; 41; 51; 507; 529; 544; 541; 901; 903) arranged to rotate with respect to a first axis; - a second inertial body (143; 153; 1306; 1406; 1506; 302; 313; 31 ...

Flexure pivots, which are widely used for precision mechanisms, generally have the drawback of presenting parasitic shifts accompanying their rotation. The known solutions for canceling these undesirable parasitic translations usually induce a loss in radi ...

The Foucault pendulum is a well-known mechanism used to demonstrate the rotation of the Earth. It consists in a pendulum launched on linear orbits and, following Mach’s Principle, this line of oscillation will remain fixed with respect to absolute space bu ...

The balancing of mechanisms consists in distributing their moving masses, inertias, and elastic components in order to achieve key mechanical properties, such as the insensitivity of the mechanism to gravity and to the motions of its chassis, or the elimin ...

This study employs thematic analysis to delve into the experiences of 12 alumni engineering students who participated in the elective course "Collective Creation: Improvised Arts and Engineering" at the Swiss Federal Institute of Technology of Lausanne (EP ...

Typical flexure-based XY-stages have a serial design, and their layout results in the flexures being loaded in flection in face of heavy payloads or vertical loads. This paper presents a design with zero parasitic shift in which all flexures are loaded in ...

The Foucault pendulum provides a demonstration of the turning of the Earth. The principle at work is that linear oscillations of a two-degree-of-freedom isotropic harmonic oscillator remain unchanged in an inertial frame of reference, so appear to precess ...

Simon Nessim Henein

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Safe Puncture Tool for Retinal Vein Cannulation

IsoSpring : vers la montre sans échappement

Load cell with adjustable stiffness based on a preloaded T-shaped flexure pivot

Articulated structures with flexible joints dedicated to high precision robotics

Focusing System Flexure-Mechanism for the Close-Up Imager Instrument of the ExoMars Rover

Mechanical oscillator with tunable isochronism defect

Parallel spring stages with flexures of micrometric cross-sections

6 DOF repeatability measurement setup for measuring position of assembled silicon parts with nanometric resolution

Two degree of freedom mechanical oscillator

Automatically Starting and Secured Detent Escapement for a Timepiece

Teaching Through Performing Arts in Higher Education: Examples in Engineering and Psychology

Mechanical Slit Mask Mechanism for the James Webb Space Telescope Spectrometer

Horological oscillator

Near-Zero Parasitic Shift Flexure Pivots Based on Coupled n-RRR Planar Parallel Mechanisms

Zero Parasitic Shift Pivoting Kinematic Structures Based On Coupled N-RRR Planar Parallel Mechanisms For Flexure Pivot Design

Design of a Flexure Based Low Frequency Foucault Pendulum

Mechanism Balancing Taxonomy for the Classification of Horological Oscillators

Exploring the impact and challenges of an embodied and improvisation-based couse: insights from engineering students

High-precision flexure-based XY-stage with high stiffness and load capacity

Foucault pendulum properties of spherical oscillators