The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the characterization of an infrared (IR) Longwave camera kit (Lepton-Flir), based on a bolometer array; for the telemetry measuring of temperature in the human skin. It is important to adapt the device to the measured material since the radiometry depends on the emissivity of the material in question. The characterization took place with the comparison with a thermocouple placed...
This work present a new microwave double slot antenna designed specifically to treat, with thermal ablation, bone tumors. Different levels of input power were analyzed to know its performance. 5 W and 10 W of constant power and a variable input power (8 W – 3 W) were applied for 15 min. A 3D model, solved by the finite element method, was developed to analyze the effectiveness of the antenna. First,...
Three numerical models are presented in this work i. e., a reference model and interpolated models varying geometrical traits, material properties, boundary conditions and mesh size to establish their effects in the resultant electric field during electrochemotherapy. For static conductivity the results show that the use of an interpolation function grid of 1 mm and a normal mesh are suitable for...
This paper presents a model and the validation of microwave radiation into the surrounding breast tissues, these patterns are obtained by applying ablation therapy.
Electroporation consists in an electropermeabilization of the cell membrane as a consequence of its exposure to an external electric field. Electrochemotherapy is an application of electroporation and represents a minimally invasive technique which is pretended to be applied in breast cancer treatment. The distribution of the electric field in tumoral tissue was obtained by simulation using finite...
Electrochemotherapy (ECT) is an application of reversible electroporation currently used in the European clinical practice to enhance absorption of chemotherapeutic drugs successfully used in the treatment of cutaneous and subcutaneous tumors. High response ratings obtained in these tumors encourages further investigation about the application of ECT in deep-seated tumors. As an approach to real anatomical...
Electrochemotherapy is an electroporationbased treatment successfully used in palliation of cutaneous and subcutaneous tumors. Its high response rate encourage further research on electrochemotherapy applied in deep tissues as a minimally invasive procedure for primary tumors. In order to assess electrochemotherapy effectiveness in breast primary tumors in Mexico, it is presented a review of background,...
This paper comprises the methodology followed to design and implement a wavelet packet based algorithm for QRS region detection and R/S wave identification. Validation is performed using electrocardiographic (ECG) records 100 to 109 of the MIT-BIH Arrhythmia database. The proposed algorithm reconstructs the ECG signal using two nodes from the wavelet packet decomposition. Sensitivity (Se) and positive...
This paper comprises the analysis of rats electrocardiogram (EKG) recorded within a toxicology study. Acquired signals are processed to assess changes in heart response to air pollution in Mexico City, by means of Heart Rate Variability (HRV) using the SDNN index. EKG records were acquired along 8 days from 12 rats, divided into control group, supplied with filtered air (FA), and exposed group, who...
An improving to control a hand prosthesis prototype is presented on this paper, it is a feedback system to measure and limit currents for five actuators. Three different actuators were used: servomotor, stepper motors & gear motors. The hand performs two different movements: flexo-extension & abduction-adduction; is controlled via embedded systems using Arduino® platform, each finger has a...
To propose a prototype of an artificial hand with 5 degrees of freedom with anthropomorphic characteristics and anthropometric dimensions. It a modular prosthesis that will be attached to different types of prosthesis and connectors. This work is based on the anatomical and biomechanical features and functions of the hand to perform grasping movements performed by the fingers. For this, methodological...
This work presents an algorithm for a shoulder model as a dynamic system to reproduce its movements. This proposal describes the range of motion of the shoulder through a coordinate system by using matrix rotation. Thus the shoulder motion is represented in a new coordinate system by a vector position. The reliability of the proposal algorithm was performed by making several tests on a healthy volunteer...
This study presents a method for baseline drift removal in the ECG signal by means of the discrete wavelet transform with the Daubechies-4, in where the central pseudo-frequency parameter is used. The sampling frequency of ECG record related to each decomposition scale of the transform is assessed. DWT is applied to the level of decomposition calculated with the above values; this makes the algorithm...
This paper presents the characterization of a High-Power Radiofrequency (RF) system applied to oncology hyperthermia. The characterization is made by measuring the induced increase of temperature of a rectangular waveguide radiating with a flat plate antenna in a solid muscle-like phantom. Temperature measurements are taken at different depths with optic fiber sensors. The measurements are made with...
To simulate the real conditions where the ultrasound will be applied, it is necessary the employment of materials to mimic the ultrasound behavior of tissues; these kind of materials are called phantoms. Therefore, it is important to measure the basic characteristics that must be mimicked; one of them is the ultrasound propagation speed. This characteristic could be employed to estimate the soft tissue...
Human gait analysis help doctors analyze, diagnose and document aberrant gaits with tools that compare the gait of patients before and after treatment to historical cases of normal and abnormal gaits. Among tools used for walking analysis, 3D scanners are some of the most useful because they can generate high fidelity reconstruction of patientpsilas movement, aiding the specialist in the diagnosis...
When an unfortunate event affects the motor capacity of a person, it is necessary to use devices like wheelchairs that offer a means o displacement for patients with motors problems of the lower limbs. Some patients that cannot manipulate the wheelchair with their arms due to a lack of force or psychomotor problems in the superior members, request electric wheelchairs, frequently manipulated with...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.