Rigoberto Martinez Mendez

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• PhD. Biomedical engineering
• Professor at Autonomous University of Mexico State

The sclera is a white membrane rich in collagen and elastin fibres, which gives it an affinity for bilirubin. This yellow substance is produced by the breakdown of the heme group, and when its levels are elevated, it causes jaundice a condition that leads to yellowing of the skin, mucous membranes, and sclera. The intensity of the yellowing in the...

The Romberg test is widely used for static postural balance assessment, but the effect of foot position on center of pressure (CoP) parameters remains unclear. This study compared CoP parameters in 47 participants aged 13 to 71 years, with two foot positions: a comfortable stance and feet together. This broad age range was used to capture significa...

Introducción Imaginemos un futuro en el que la habilidad quirúrgica y la destreza no sean cuestiones de opinión, sino hechos cuantificables, medibles de forma precisa y sin ambigüe-dades. Este futuro ya está tomando forma, gracias a la convergencia de la medicina, la tecnología y en especial, la inteligencia artificial (IA). La cirugía laparoscópic...

En el presente artículo se analiza y diseña un convertidor Push-Pull para la alimentación de amplificadores de audio de calidad y potencia en el uso automotriz. Los amplificadores de audio, especialmente los de potencia, necesitan una fuente de alimentación óptima para funcionar eficazmente a todas las frecuencias audibles para el ser humano. Es es...

La prevención de caídas, fuente principal de lesiones y mortalidad en adultos, se puede mejorar por medio de una adecuada evaluación del equilibrio. No obstante, el alto costo y complejidad de las herramientas actuales limitan su aplicación, particularmente en clínicas de atención primaria. Surge así la necesidad de metodologías más accesibles y ec...

This article presents the development of an IoT-enabled control and data logging interface for the modified Wii Balance Board (mWBB) v1.0. The objective was to enhance usability and functionality for geriatric balance assessment. Hardware modifications, firmware programming, and a user-friendly web-based interface were employed. Preliminary testing...

Purpose.The aim of this work is to present a new physical laparoscopy simulator with an electromyography (EMG)/accelerometry-based muscle activity recording system, EvalLap EMG-ACC, and perform objective evaluation of laparoscopic skills based on the quantification of muscle activity of participants with different levels of laparoscopic experience....

In recent years, stress and anxiety have been identified as two of the leading causes of academic underachievement and dropout. However, there is little work on the detection of stress and anxiety in academic settings and/or its impact on the performance of undergraduate students. Moreover, there is a gap in the literature in terms of identifying a...

Background The gut microbiota can impact older adults’ health, especially in patients with frailty syndrome. Understanding the association between the gut microbiota and frailty syndrome will help to explain the etiology of age-related diseases. Low-grade systemic inflammation is a factor leading to geriatric disorders, which is known as “inflammag...

This paper analyzes the reliability and usability of a portable electronic instrument that measures balance and balance impairment in older adults. The center of pressure (CoP) metrics are measured with a modified Wii Balance Board (mWBB) platform. In the intra- and inter-rater testing, 16 and 43 volunteers (mean 75.66 and standard deviation (SD) o...

En materia de salud la prevención es la mejor y más barata “medicina”. Para ello se requieren recursos humanos y técnicos que puedan auxiliarse de instrumentos tecnológicos accesibles, pero al mismo tiempo preciso. https://www.uaeh.edu.mx/gaceta/4/numero38/abril/luciernaga.html

Pulse Width Modulation (PWM) strategies are crucial for controlling DC–AC power converters. In particular, transformerless inverters require specific PWM techniques to improve efficiency and to deal with leakage ground current issues. In this paper, three hybrid PWM methods are proposed for a DCM-232 three-phase topology. These methods are based on...

Background The timely detection of fall risk or balance impairment in older adults is transcendental because, based on a reliable diagnosis, clinical actions can be taken to prevent accidents. This study presents a statistical model to estimate the fall risk from the center of pressure (CoP) data. Methods This study is a cross-sectional analysis f...

En pacientes con la enfermedad vascular cerebral (EVC) la discapacidad motriz es la secuela más común, compleja y difícil de rehabilitar. La estimulación eléctrica funcional (EEF) y la estimulación eléctrica medular (EEM) se encuentran entre las técnicas más prometedoras en la rehabilitación motora. Sin embargo, en su forma de aplicación actual, pr...

Prácticas simples usando el microcontrolador PIC24F16KA102 y la tarjeta de desarrollo Easy-33v6 con compilador MikroC

This work presents the design and development of a new alternative tool to measure the Center of Pressure (CoP) displacements, intended to evaluate the human balance. The device is based on a modified commercial balance board used for video games, resulting in a low-cost, portable device capable of computing the CoP, providing 24 of the most used i...

La ingeniería biomédica una ciencia interdisciplinaria, a la cual se incorporan cada vez más estudiantes por medio de las diferentes instituciones que ofrecen programas de estudio relacionados con esta disciplina, con la finalidad de entender el rumbo que actualmente está tomando esta disciplina, es necesario conocer los principales programas de es...

Se presenta un sistema alternativo para la programación de microcontroladores utilizando la metodología de Rapid Control Prototyping (RCP). De esta manera se facilita la programación de microcontroladores y su implementación en sistemas de control complejos, reduciendo el tiempo y complejidad de programación. El modelo RCP aquí presentado se desarr...

En los últimos años, diferentes estrategias y modelos matemáticos se han desarrollado para analizar y controlar vehículos aéreos no tripulados. Este artículo amplía este panorama al enfocarse en un sistema aéreo no tripulado estable por construcción. Gracias a su diseño, el sistema reportado disipa la energía recibida por la acción de perturbacione...

Background and Objective Traditional methods to determine stress and anxiety in academic environments consist of the application of questionnaires, but the main disadvantage is that the results depend on the students’ self-perception. Being able to detect anxiety-related stress levels in a simple and objective way contributes greatly to dealing wit...

Objective: This paper presents the design and development of a new electronic portable device to assess the human balance of the human body during standing, using a minimal number of sensors and peripheral components. This device is aimed to evaluate human balance in environments outside of specialized laboratories, such as small clinics and thera...

Este artículo reporta los requerimientos que debe satisfacer un asistente tecnológico que apoye en las actividades de cuidado de un paciente con deterioro cognitivo medio. El enfoque de diseño centrado en el usuario fue tomado en cuenta para realizar un análisis y poder establecer los requerimientos mencionados. Se presenta la metodología de elabor...

The essential tremor syndrome is a nerve disorder affecting around 77 million people worldwide. The causes are still not completely clear and there is no cure. Essential tremor is characterized by an uncontrollable "shaking" that affects greatly the quality of life of patients. The main treatments nowadays are drugs or surgery which have collateral...

Solar energy harvesting using Photovoltaic (PV) systems is one of the most popular sources of renewable energy, however the main drawback of PV systems is their low conversion efficiency. An optimal system operation requires an efficient tracking of the Maximum Power Point (MPP), which represents the maximum energy that can be extracted from the PV...

Objetivos: En la actualidad existen diversas opciones de prótesis de mano, sin embargo, ninguna de ellas es adecuada para la utilización de teclados, debido a la lentitud o falta de movimientos adecuados. En este trabajo se plantea el diseño conceptual de una prótesis de mano de bajo costo, controlada por señales electromiográficas, especializadas...

A cerebrovascular disease also known as stroke affects every year more than 15 million people in the world, from them, 5 million suffer permanent disability and 5 million must undergo a long process of rehabilitation to return to their normal lives. Within the rehabilitation techniques, Functional Electrical Stimulation (FES) has been used for deca...

La enfermedad vascular cerebral (EVC) afecta cada año a más de 15 millones de personas en el mundo, de ellos, 5 millones sufren discapacidad permanentemente y 5 millones deben pasar por un largo proceso de rehabilitación para regresar a sus vidas normales. Dentro de las técnicas de rehabilitación, la Estimulación Eléctrica Funcional (EEF) se ha uti...

Se estudia la distribución de temperaturas en el cuerpo al aplicar una férula para terapia térmica por medio de un estudio paramétrico. En dicho estudio se analizó el efecto de diferentes espesores de la capa de grasa (1 mm-30 mm) al utilizar férulas a temperaturas que van de los 38°C a los 44°C. Se analizó la profundidad de penetración de calor, a...

In this paper we present a Wiimote-based infrared tracking system to estimate the position of a single infrared marker placed in surgical instruments used for spine fixation procedures in an image-guided simulation system for training. The purpose of our research is theobjective assessment of surgical skills and abilities during the simulation-base...

This paper presents an electronic system aimed to assist on the postural evaluation by measuring the weight distribution on the feet. Postural evaluation is commonly used by physiotherapists in order to correct muscle-skeletal problems such as those derived from ageing, accidents, diseases, etc. The developed electronic system was validated prelimi...

En este trabajo se presenta un sistema electrónico, basado en la medición de la distribución del peso en los pies, cuyo objetivo es coadyuvar en la evaluación postural. La evaluación postural utilizada por los fisioterapeutas para corregir problemas musculo-esqueléticos derivados por la edad, accidentes, enfermedades, etc. El sistema electró- nic...

La falta de repetitividad y estandarización en las sesiones de termoterapia afectan la percepción de pacientes y doctores y esta es una de las razones que hacen inciertos los estudios acerca de los efectos a largo plazo de esta terapia en personas que padecen enfermedades crónicas o autoinmunes, es por esto que en este trabajo se aborda una f...

UTCJ Theorema Revista Científica número 6, consulta y descarga de 30 artículos de investigación básica y aplicada, ofrece visualización completa de la revista.

This document presents the design and construction of a plasma generator for electrosurgical applications. The generator is comprised of four main parts: DC power supply, topology push-pull, controller unit and plasma probe. First results generating plasma by repetitively-pulsed electrical discharges in sodium chloride saline solution are reported

Muscular system function could be affected by neurological disorders such as cerebral strokes, injuries and neurological disorders. Healthcare experts usually relay on their experience to diagnose and recommend a specific treatment. However, there exist technological devices capable to measure the electrical activity in the muscle improving the dia...

RESUMEN Este trabajo presenta un estudio cobre la estimulación vestibular galvánica (EGV). Una técnica conocida desde hace más de un siglo, la cual consiste en estimular por medio de una corriente eléctrica al sistema vestibular y afectar de ésta manera el balance en humanos y animales. A pesar de que existen diversos estudios al respecto, aún exis...

El principal objetivo de este estudio fue validar sí el dispositivo Leap Motion puede medir temblores o vibraciones de una mano sintética, la cual fue excitada mecánicamente en un ancho de banda similar al del temblor fisiológico (8-12 Hz) y comparar su respuesta en frecuencia con el dispositivo comercial Trigno Wireless EMG. Los resultados demuest...

Este trabajo describe el diseño e implementación de un mango instrumentado para la implementación de una plataforma de adquisición de la fuerza máxima de agarre de la mano. El diseño toma en cuenta la ergonomía de la mano, ya que influye directamente en la fuerza máxima de agarre que se puede ejercer sobre el mango [1]. A pesar de que existen parám...

The aim of this paper is to present a mechanism to adapt a boroscopic camera to the operation of a flexible endoscope and get the vision of a real device, leveraging technology for portable devices to provide surgeons the visualization so important in the training and application of endoscopy, because without this tool is virtually unenforceable.

This paper describes the design|, construction and characterization of an electronic device for the measurement of acceleration signals in the human body at high sampling rates. Recently, the scientific community experiments an increasing interest in the use of inertial sensors for the measurement and evaluation of human movement. Acceleration is o...

There are two methods widely used by physiotherapists for pain treatment and rehabilitation purposes. These methods are: Thermal contrast therapy and Transcutaneous Electrical Nervous Stimulation (TENS). Thermal contrast therapy usually consists on the application of hot and cold pads over the site of interest during a determined period of time (us...

Resumen— En este artículo se presenta el diseño de un sistema de control a distancia para aplicarse a un equipo de ultrasonido, el cual se puede controlar a través de una palanca de posicionamiento y con el empleo de cámaras de video, tener visión por computadora como medio de retroalimentación. El sistema utiliza la red de Ethernet como medio de t...

The article presents an overview of the design and develops of a smart ambulatory assistive prototype device for healthcare of older adults based on force sensors, inertial measurement unit (IMU), and motors that are able to provide users with enhanced mobility and support during gait, utilizes an ambulatory assistive device, called rollator, to su...

Introducción En este artículo se presenta un Sistema de Telecontrol a distancia para aplicarse a un equipo de Ultrasonido, el cual se puede controlar a través de una palanca de posicionamiento y con el empleo de cámaras de video como medio de retroalimentación. El sistema utiliza la red de Ethernet como medio de transmisión y la información obtenid...

El objetivo principal de este trabajo es describir un sistema de medición del movimiento humano integrado por una unidad de medición inercial (IMU), MPU6050 de la marca InveSense, un microcontrolador Atmega 328p de la marca ATMEL, un módulo y tarjeta microSD de la marca SanDisk de 4GB de capacidad. La finalidad del instrumento es obtener medicio...

Este artículo se enfoca en las consideraciones que se deben tomar en cuenta sobre el diseño de robots modulares que permitan auxiliar al médico en intervenciones de CMI (Cirugía Mínimamente Invasiva). Se presenta el estado del arte de los sistemas robóticos modulares tanto re-configurables como auto re-configurables, así como los dispositivos y mater...

This article concerns the aspects that have to be taken into account for mechanical design of modular robots to be used as a surgical tool in MIS (Minimally Invasive Surgery) interventions. For this purpose, several works concerning modular, reconfigurable and autoreconfigurable robots are presented. Materials and surgical devices that are used for...

El uso de sensores inerciales en aplicaciones médicas es un campo en auge debido a las ventajas que este tipo de sensores presentan. Debido a la naturaleza de los sensores, la mayor parte de aplicaciones en medicina envuel- ven medición de movimiento en tareas tales como rehabilitación y diagnóstico entre otras. En este documente se presentan do...

Resumen—En este trabajo se presenta una metodología para procesar y acondicionar (mediante la tecnología PSoC 5) la señal de un conjunto de sensores de fuerza de tipo resistivo, con el objetivo de lograr una señal útil para su aplicación en un sensor de fuerza palmar cilíndrica de siete grados de libertad, esto permite hacer mediciones al realizar...

This paper presents a system for tracking the movement of laparoscopic instruments which is based on an orthogonal system of webcams and video image processing. The movements are captured with two webcams placed orthogonally inside of the physical trainer. On the image, the instruments were detected by using color markers placed on the distal tip o...

This paper describes the design and development of a training system for minimally invasive surgery skills in the field of otolaryngology. The main purpose of the system is for the surgical residents to gain experience and practice. In order to provide the surgeon a practical interaction environment, training modules and an evaluation methodology a...

Evaluation of movement disorders is a useful tool for the diagnostic and monitoring of diseases related with damage of the motor control systems, such as Parkinson's disease. The evaluation of well characterized movement disorders has been proposed using different techniques each one with their advantages and limitations. This document propose the...

This work involves the design and development of a training system for minimally invasive surgery skills in the specialty of otolaryngology. The purpose of the system is to give experience to the surgical residents. The design and development of training modules is required to provide the surgeon with a practical interaction environment, as well as...

This paper presents the results obtained from a recording system for the insertion of surgical instrumental which is guided by imaging equipment in minimally invasive surgeries focused on the lumbar region. The system involves hardware and software tools; the latter are capable of yielding angles, intracorporeal length, acceleration, and velocity o...

. Con el propósito de establecer soluciones tecnológicas propias y llevarlas a los quirófanos de seguridad social, en la Sección de Bioelectrónica del CINVESTAV se realizó una investigación que culminó en el año 2002 con la fabricación de un asistente robótico para cirugías laparoscópicas. Este asistente robótico bautizado como robot Tonatiuh cue...

Las redes de monitoreo climático son una herramienta indispensable para la obtención de información de manera rápida y confiable. Sin embargo, operar y mantener un sistema de este tipo resulta ocasionalmente muy costoso. En este trabajo se describe el diseño de una red de monitoreo ambiental bajo un contexto urbano, utilizando internet como medio p...

We have developed a system to telemanipulate a robotic arm through a digital glove. In essence, a manipulation scheme has been designed to connect both components. Such manipulation scheme was developed to translate each gesture coming from the glove, into a valid command to the robotic arm. This scheme is believe to be friendly and functional beca...

El uso de sensores inerciales en aplicaciones médicas es un campo en auge debido a las ventajas que este tipo de sensores presentan. Debido a la naturaleza de los sensores, la mayor parte de aplicaciones en medicina envuelven medición de movimiento en tareas tales como rehabilitación y diagnóstico entre otras. En este documente se presentan dos mét...

In medicine, specifically in the area of minimally invasive surgery (MIS), there is a great need to develop new and accessible intelligent system for educational technology and evaluation methodologies to ensure that the surgeon dominates the laparoscopic technique. Innovative training systems have limited their academic impact, due inter alia to t...

The measurement of anticipatory postural adjustments has been proposed as a method for quantitative evaluation of the human equilibrium system and some neurological disorders such as Parkinson's disease. This work presents the results of measuring anticipatory postural adjustments using accelerometers and angular velocity sensors attached on the lo...

In an effort to develop new methods for measuring human movements that permit faster, unobtrusive, and precise detection of disorders, several researchers are proposing the use of inertial sensors as a tool for measurement and evaluation. Measurement devices based on inertial sensors permit the development of fully wearable systems that could impro...

In this work, 3D accelerometers were used to evaluate the usefulness of the vertical acceleration axis to assess postural sway in elderly (16 subjects, age 69.3±3.6 years) and young (11 subjects, age 23.8±2.4 years) healthy people. Both groups evaluated standing upright under open (OE) and closed eyes (CE) conditions. Two measures, medium frequency...

The present study was performed to evaluate and characterize the potential of accelerometers and angular velocity sensors to detect and assess anticipatory postural adjustments (APAs) generated by the first step at the beginning of the gait. This paper proposes an algorithm to automatically detect certain parameters of APAs using only inertial sens...

The purpose of this study was to evaluate the sensitivity of 16 parameters derived from acceleration to detect changes caused by age and visual conditions during quiet standing and detect and minimise possible sources of unwanted variability that could affect accelerometer measures on the trunk. Twenty-seven healthy subjects, including 16 elderly (...

Los convertidores de corriente directa a corriente alterna (CD/CA), son dispositivos ampliamente usados en varias aplicaciones. Su uso abarca desde pequeñas fuentes de energía para equipo electrónico hasta fuentes de alto poder para control de motores industriales, hornos de fundición o generadores eléctricos. Sin embargo las técnicas de conversión...

We present a study on using a smart phone as a tool to evaluate anticipatory postural adjustments (APA) before the beginning of normal gait in healthy subjects. The results show a significantly lower amplitude of anticipatory postural adjustments in the mediolateral axis (ML) when subjects used the non-dominant leg for the first step compared with...

The Anticipatory Postural Adjustments (APAs) precede the voluntary movements in order to minimize the perturbations that might cause to the loss of balance. The purpose of this research is to evaluate the use of wearable motion sensors as an alternative method to detect and assess the APAs in humans. In this paper we described the results of a syst...

This article describes the design and construction of an electronic device to assist orthopedic surgeons in the intramedullary nailing of long bones. The objective of the system is to reduce the cumulative radiation to which surgeons are exposed while performing the operation, as well as reduce the time required to complete the task. The system use...

Los convertidores de corriente directa a corriente alterna (CD/CA), son dispositivos ampliamente usados en varias aplicaciones. Su uso abarca desde pequeñas fuentes de energía para equipo electrónico hasta fuentes de alto poder para control de motores industriales, hornos de fundición o generadores eléctricos. Sin embargo las técnicas de conversión...

It is well know that some specific human gait disorders are symptoms of several diseases. In this work we are interested in neurological disorders such as Parkinson disease, Alzheimer’s dementia, Huntington’s disease, etc. These neurological disorders usually cause small and imperceptible changes in gait that, if detected at early stage could help...

Each year are performed more than 492, 000 surgeries on the world for repair fractures in long bones. The most used method to fix this problem is the closed intrame-dullary nailing, According as surgeons the most difficult task is the interlocking of the nail. The present work proposes a new system for detection of the intramedullary nail’s holes...

Each year are performed more than 492, 000 surgeries on the world for repair fractures in long bones. The most used method to fix this problem is the closed intramedullary nailing, According as surgeons the most difficult task is the interlocking of the nail. The present work proposes a new system for detection of the intramedullary nail's holes us...

Every year, more than 492,000 orthopedic surgeries are performed throughout the world to repair fractures of the long bones. The most commonly used method of repair is closed intramedullary nailing. According to surgeons, the most difficult task of this method is the distal locking of the nail. This work proposes a new system for locating the holes...

In this work, a new electronic system is proposed to diminish the radiation doses received by orthopedic surgeons due to the use of fluoroscopes during surgeries to repair fractures in long bones using the intramedullary nailing technique. By using magnets inserted into the nail before inserting it into the bone, the proposed system is able to loca...

This work presents the analysis, design and construction of a single-phase DC/AC converter for didactic laboratory tests. The inverter allows generating PWM, UPWM and programmed pulse signals for harmonic elimination, with analog and digital control. A PIC16F873 microcontroller was used for digital control, programmed in Assembler to generate sign...