Revista Ingeniería Biomédica

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Desarrollo de un sistema de audición vibrotáctil para el acceso a la música: Fase I
(2013-09-26) Villa-Moreno, A. (Adriana); García-Quiroz, F. (Felipe); Castaño-Jaramillo, P. (Paula); Londoño-Jaramillo, N. (Nathalia)
The sense of touch transmits not only isolated tactile sensations also information that can be processed at the cerebral cortex in a similar way as it is in the brain areas for audition or vision. Both vibratile and electrical stimuli have been used for tactile stimulation devices, and the former was chosen for the system presented. The tactile auditory-substitution systems have focused on communication skills, but this work pretends the construction of a device for developing musical and artistic skills. These should be reflected in the capacity to identify musical pieces through tactile stimulation. The graphical user interface of the system was programmed using the virtual instrumentation software LabVIEW 7.0. It includes tools for the learning of the system, which were developed to help increasing the sensitivity of the user. Besides, to ensure a clear association with music theory and acoustic concepts some visual feedback systems were implemented
Acceso abierto
Diseño y construcción de un fonocardiógrafo digital con visualización en LabVIEW
(2014-04-18) Osorio-Valencia, J. S. (Juan Sebastián); Cuesta-López, L. F. (Luisa Fernanda); Gómez-Maya, F. (Felipe)
The auscultation of the heart noises has always been an important tool in medicine, a good diagnosis of illnesses related to the heart valves should be given from a phonocardiogram able to give the doctor a reliable information of the patients situation. The design presented is a phonocardiograph capable of amplifying and filtering the acoustic signs derived from the heart. After an analog to digital conversion of those signs the information is sent by serial port to a graphic environment in LabVIEW for its registration and analysis in real time
Acceso abierto
Diseño y construcción de un dispositivo para la alerta de obstáculos (DAO)
(2014-04-18) Herrera-Velásquez, A. (Alejandro); Jaramillo-Morales, R (Roberto)
This paper presents the development of a portable electronic device for blind people. It is composed of an ultrasonic pair (emitter-receiver), and lead by a microcontroller. First, an emitter block generates ultrasonic waves that are reflected after they had collided with an obstacle. The reflected signal is captured by the receiver. The signal is then amplified, and after a threshold comparison is made by the microcontroller, an output is carried to the motor of a vibrator located in the patient’s waist.The systems block diagram, the programming logic, the mechanical design, and the electrical circuit schematics are presented.
Acceso abierto
Development of a Dynamic Goniometer with an Incremental Encoder
(2014-04-19) García-Quiroz, F. (Felipe); Villa-Moreno, A. (Adriana); Restrepo-Peláez, M. (María)
La medición dinámica de los ángulos articulares se ha convertido en un parámetro fundamental para deportistas, médicos y analistas de los procesos de rehabilitación. El desarrollo de dispositivos para estas aplicaciones ha presentado retos importantes debido a la imposibilidad de implementar los sistemas mecánicos requeridos para la medición, sin afectar el movimiento natural de las articulaciones. Los goniómetros digitales se han construido a partir de diferentes principios electrónicos, particularmente basados en las variaciones resistivas de potenciómetros. Este trabajo muestra el desarrollo e implementación de un goniómetro dinámico basado en un encoder incremental con un sistema de transmisión mecánico entre una articulación de tipo bisagra y una polea conectada a un disco óptico. La rotación se detecta con un LED infrarrojo y un fototransistor. El cálculo del movimiento angular en la articulación se realiza con un microcontrolador. Finalmente los datos se muestran en tiempo real en una pantalla de cristal líquido (LCD).
Acceso abierto
Interfaces neuronales y sistemas máquina-cerebro: fundamentos y aplicaciones. Revisión
(2014-04-19) García-Quiroz, F. (Felipe); Villa-Moreno, A. (Adriana); Castaño-Jaramillo, P. (Paula)
Abstract—During the past ten years the Neural Interfaces and brain-computer communication systems area has become an important field for research, in part due to the increasing statistics of motor and sensorial disabilities. The development of these systems and interfaces requires the coordinated work of different areas such as physiology, materials science, instrumentation and signal processing, computational intelligence, mechanics, electronics, robotics, and informatics, among others. They allowed the right integration between the nervous system physiology, the construction of biocompatible electrodes, the acquiring of proper signals for processing, the classification and identification of coded patterns and the design of the actuators elements to finally achieve the goal of the interface. In this review the three basic stages of neural interfaces are shown. This includes: signal acquiring, signal processing and the wide variety of applications with the effectors systems.
Acceso abierto
Para recordar los inicios de la Ingeniería Biomédica en Antioquia
(2014-04-19) Escobar-Mejía, I. (Ignacio)
Acceso abierto
Prototipo de incubadora neonatal
(2014-04-19) Restrepo-Pérez, L. (Laura); Durango-Londoño, N. (Natalia); Gómez-Suárez, N. E. (Nicolás Eugenio); González-Ramírez, F. (Felipe); Rivera-Bonilla, N. (Nadia)
Newborn and premature infants incubators provide a controlled environment for infants which need special care. The constructed prototype has the potential to cover the minimal needs in a hospital, in a way that medical staff may control the newborn environment. This article reports the design and construction of the prototype included research for selecting and building the elements of the prototype: the chassis, hood, mattress case, and a power source. Different transducers were included in the incubator for measuring temperature, luminosity, noise, humidity, and a door alarm. The purpose of these was to guaranty the proper conditions for the newborn.The constructed prototype is fully functional and constitutes a first step for building newborn incubators with appropriated technology.
Acceso abierto
SpeedMed: device for measuring velocity in track sports
(2014-04-20) Sánchez-Aldana, N. (Natalia); Velásquez-Gómez, J. (Juliana); Villa-Bedoya, J. (Juliana); Marín-Correa, J. M. (Juan Manuel)
Everyday, industries make use of economic resources to carry on research studies of products to improve the athletic performance of people. This is the main reason why it is believed that the development of an inexpensive and portable device capable of measuring times and speeds in track sports in general will provide useful information to study the performance of not only sportsmen, but also of ordinary people under stress situations allowing them to determine their weaknesses. In this project, two very simple sensors (photocells) are used to develop a device capable of measuring speed. A microcontroller was programmed to measure the time between the interruptions of two laser beams which lighten the surfaces of photocells, and it was also programmed to calculate velocity for a given distance. These values are sent to a Liquid Crystal Display (LCD) where they can be visualized and interpreted.
Acceso abierto
Diseño de un Scalp Cooling System
(2014-04-20) Ávila-Monte, O. C. (Olga Carolina); Barrientos-R, E. (Elizabeth); González-Cruz, C. (Catalina)
Chemotherapy-induced hair loss is one of the most common and distressing side-effects of cancer therapy. Scalp cooling has become an increasingly effective method to prevent hair loss. The aim of this article is to describe the process of design of a scalp cooling system to prevent chemotherapy-induced alopecia.
Acceso abierto
Development of an electro-mechanically controlled hand orthosis for assisting finger extension in stroke survivors
(2014-04-20) Villa-Bedoya, J. (Juliana); Petroff, N. (Neil)
Stroke is the leading cause of long-term disability in the world. It causes chronic deficits, such as hemiparesis, especially prevalent in the distal upper extremities. An electro-mechanically driven hand orthosis has been developed to assess the potential therapeutic use of such devices in rehabilitating hand function. A small Direct Current (DC) brushed motor is used as the main actuator, and a cable-driven glove connected to the motor shaft is the central component of the device. The orthosis control is achieved through a force feedback loop using a miniature load cell attached in series to the cable and control module. The later, generates Pulse Width Modulated (PWM) and direction signals required to drive the motor. The speed is determined by the duty cycle of the PWM signal while the direction by the status of a flag bit modified by a user-operated switch. A portable design was achieved by using a 6 V battery pack as the power supply. The device is ready for use in clinical trials with stroke survivor subjects as it has already been tested on healthy individuals with satisfactory performance.
Acceso abierto
VirtualEar: Diseño y construcción de un audiómetro virtual
(2014-04-20) Gallego-Ortiz, C. (Cristina); Ángel-Vélez, J. (Juliana); Zapata-Vanegas, C. (Catalina); Marín-Correa, J. M. (Juan Manuel)
A virtual audiometer was developed using the virtual instrumentation platform Labview7.1. VirtualEar is a system that permits the evaluation of the audible capacity of a person, through an audiometric prove by air, with masking, to detect the crossed audition. The audiometry is done producing pure tones in the audible frequency’s range (125Hz-8000Hz) with pressure intensity that varies in a range from 0dB to 100dB. Masking consists on sending a white noise signal to the opposite ear of the one that is being tested. Both signals are emitted through two separate channels, and in that way, the threshold of minimum audible pressure is detected. VirtualEar also permits to generate and save the information in tables, graphics and reports. Furthermore, it’s possible to control each patient’s files and print the results.
Acceso abierto
Oportunidad para tener nuevas experiencias
(2014-04-20) Tobón-Zuluaga, C. (Catalina)
Acceso abierto
Desarrollo de la línea de Bioinstrumentación, señales e imágenes médicas en el programa de Ingeniería Biomédica de la EIA-CES
(2014-04-20) Torres-Villa, R. A. (Róbinson Alberto); Ramírez-Giraldo, J. C. (Juan Carlos); Valencia-Díaz, E. (Edison)
Acceso abierto
Fabricación de microagujas en fotorresina SU-8 mediante fotolitografía para aplicaciones biomédicas
(2014-04-20) Lopera-Aristizábal, M. (Mónica); Lopera-Aristizábal, S. (Sergio); Vélez-Restrepo, J. M. (Juan Manuel )
Hormonal illnesses like diabetes demand the frequent use of fluid sampling and drug delivery procedures, which produces traumas on skin tissues, as a result of conventional needles penetration. This fact motivates the development of alternative technologies that decrease tissue damage and contribute to improve the quality of life of the patients. This topic constitutes an active field of research in many companies and universities around the world. This paper presents preliminary results of the fabrication of microneedle arrays, using the technique of SU-8 thick film photolithography, previously standardized by the Group of Materials Science and Technology of the National University of Colombia in Medellín. Micrographs of the obtained hollowed and solid needles of different sizes are presented and goals and limitations of the proposed methodology are discussed.
Acceso abierto
Descripción del método log-vision de procesamiento de imágenes en color en aplicaciones a imágenes oftálmicas
(2014-04-20) Valencia-Díaz, E. (Edison)
This paper describes an algorithm to sharpen a colour digital image based on S-CIE LAB extension. S-CIE LAB involves a series of smoothing spatial filters in the opponent color space to approximate the contrast sensitivity functions of the human vision system. The filters are linear combinations of Gaussian masks. The algorithm combines these spatial filters with the Laplacian operator in each opponent channel to obtain the sharpened image. The resulting image is then subtracted from the original image in each opponent channel and back transformed to the device independent representation space (XYZ) to obtain the final sharpened image. This article describes two examples that use the sharpening algorithm with medical images of the ophthalmic area.
Acceso abierto
La Biotecnología y el desarrollo de investigación aplicada en el programa de Ingeniería Biomédica de la EIA y el CES
(2014-04-20) López-Rojas, L. E. (Luis Ernesto); García-Quiroz, F. (Felipe); Londoño-Peláez, C. (Carolina)
Acceso abierto
Fast and accurate computation of the Euclidean distance transform in medical imaging analysis software
(2014-04-20) Gallego-Ortiz, C. (Cristina)
Fast and accurate computation of the Euclidean distance map transformation is presented using the python programming language in conjunction with the vtk and itk toolkits. Two algorithms are compared on the basis of their efficiency and computational speed; Saitho algorithm and Danielsson’s four-points Sequential Euclidean Distance (4SED). An algorithm is used to compute a scalar distance map from a 3D data set or volume, which can be used to extract specific distance values. The performance time for the Saitho computation speed was less than the Danielsson’s 4SED computation allowing a faster calculation of the Euclidean distance map. A software analysis application was implemented using the Saitho algorithm for the computation of the scalar distance maps; it also included an underlying segmentation method to allow the computation of Euclidean distance maps on micro-CT images of segmented bone structures. In the future, this application could be used in conjunction with other image processing software applications of bone analysis
Acceso abierto
Modelación por elementos finitos en un modelo de aneurisma
(2014-04-20) Correa-Posada, S. (Santiago)
Considering a model with generalized geometry and mechanical properties of the arterial wall for the peripheral vasculature aneurisms, a finite element modeling (FEM) is developed for analyzing the effects of arterial blood pressure and the arterial wall thickness in the aneurismal sac. The von Misses stresses, the transversal tensor stresses and the displacement in the aneurismal sac wall are analyzed. The possible site of rupture for this aneurism geometry is found surrounding the efferent artery and opposed to the flow inlet. A method for applying FEM to any aneurism geometry and blood pressure conditions is proposed for analyzing the risk of rupture and possible rupture site.
Acceso abierto
Jornadas de investigación ces 2007
(2014-04-20) Escuela de Ingeniería de Antioquia EIA
Acceso abierto
El aporte de la biomecánica y la Ingeniería en rehabilitación en la Ingeniería Biomédica de la EIA-CES
(2014-04-20) Torres-Velásquez, A. (Andrés); Díaz-León, C. A. (Christian Andrés); García-Muriel, L. F. (Luisa Fernanda); Toro-Hernandez, M. L. (María Luisa)