Doru Andritoi

Study on the influence of wireless communication technology on infusion pumps

In previous studies our concern was the electromagnetic compatibility in terms of life-supporting medical equipment in intensive care units. Following the results obtained, we decided to intensify our efforts in the field of electromagnetic compatibility trials of medical devices, including raising awareness of the problems of electromagnetic interference. In this work we have studied the influence of the electromagnetic field on infusion pumps / injectomats equipment used in all health facilities, not only intensive care. A very important aspect in this study is that these types of equipment used in administering medication are found in ambulances for example, a medium in which the electromagnetic field is very strong.

Elements of risk assessment in medical equipment

Medical equipment risk assessment is part of an overall medical equipment management program for a healthcare facility or system. A complete program includes corrective maintenance or repair, equipment control, asset management, health care technology planning, education, and activities directed toward improving medical device-related patient safety. The purpose of this paper is to provide some guidance lines in establishing and managing a medical equipment quality assurance program and to present some procedures for inspection, maintenance, evaluation, and performance testing for some medical devices. A computerized medical equipment management system is described. The results demonstrate that it is a useful tool in tracking device inventory and maintenance history. Also risk classes have been designed for medical devices based on the time of testing, risk must be identified in relation to patient and staff member. The results of this paper take into consideration the advances in device reliability, reduced preventive maintenance requirements, and internal device surveillance (self test) along with changes in standards.

Preliminary study of HR analysis on patients recovering after stroke

In this paper cardiovascular variability has been evaluated in patients with cerebrovascular accident (CVA), in patients recovering from stroke. In this prime report, more than twenty patients were examined; time-domain and frequency-domain parameters were studied during deep breathing (DB), Valsalva maneuver (VA) and hand grip (HG). After this we compared the HRV obtained in the specific test for each specific patient; we studied also records of different patients with the same injury, in order to estimate the magnitude of the difference. Using standard cardiovascular reflex tests we managed to analyze the heart rate variability in order to demonstrate the influence of the autonomic nervous marking parasympathetic dysfunction and sympathetic predominance in stroke people.

Dynamics analysis of heart rate during Magneto-Therapy session

In this paper we determined and analyzed the Heart Rate (HR), based on the Electrocardiographic signals (ECG) recorded before, during and after magneto therapy sessions. The purpose of our study is to determine some possible changes in the biological signals in the case of people exposure to magnetic fields. Thus, we determined and analyzed Heart Rate dynamics, both in time-domain and in frequency domain comparing the obtained results before, during and after the Magneto Therapy procedures.

Study on the influence of wireless communication technology on sensitive medical equipments

In this paper we studied the influence of electromagnetic wireless communications traffic on sensitive medical equipment used in intensive care units. We have identified the main sources of disruptive electromagnetic field existing in a neonatal intensive care unit and studied the influence of wireless communication systems type GSM and DECT 900 on the main operating parameters set to a neonatal mechanical ventilator. After studies we observed that the important parameters used in assisted mechanical ventilation such as expiratory volume, inspiratory pressure, expiratory pressure, mean pressure and tidal volume suffer significant changes when wireless communication disturbing source is at walking distance of sensitive medical equipment.

Predictive maintenance application for health technology management

Medical technology is by now an integral part of health care according to consisting general accepted standards. The Medical Equipment Management Plan defines the mechanisms for interaction and oversight of the medical equipment used in the diagnosis, treatment, and monitoring of patients. The related policies and procedures govern activities from selection and acquisition to incoming inspection and maintenance of medical equipment. The mission is to ensure that equipment used in patient care is safe, available, accurate, and affordable.

The importance of measuring electrical impedance in the analysis of human physiological parameters

This paper presents a design of medical device for bioelectrical impedance estimation. The hardware required to implement the system is based on a signal generator to provide current, a microcontroller to coordinate the process and a data acquisition board to measure the voltage changes across the analyzed region. The algorithm for calculating the physiological variables was implemented in MATLAB. Sample impedance data for a test subject are also presented.

Compartimental analysis using electrical impedance applied for real fermentation broths

The growth of micro-organisms on a culture medium for the biosynthesis of products is the process of interaction of the individual cell and culture medium. Applying the laws of thermodynamics and mass transfer and energy demonstrates that culture of microorganisms is influenced directly the temperature, pH and concentration of substrate. Implementation of monitoring and management favorable methods of biotechnology processes require the use of biochemical and biological variable. Develop and implement process control systems biotechnology has made remarkable progress. The values of these variables are determined in the laboratory by testing, observing specific sterile conditions using a complex and expensive equipment. This raises the need to use instrumental sensors instead of the “software sensors” or observer status. A state observer is an algorithm for on-line estimation of non-measurable state variables in real time based on on-line measurements of sizes more easily accessible.

Biomedical signal proccesing using simple interface application

These biological signals, such as those from the heart and brain, are routinely used for both diagnostic and therapeutic purposes. The aim of this study is to obtain a software application used to observe the ECG activity during pulse magneto therapy taking into account that this procedure is frequently used for a lot of diseases.

Study of pulse magnetotherapy effects on brain electrical activity

In this paper we study the influence of magnetic field, used for basic physiotherapy procedures, on brain electrical activity by analyzing the EEG signal. The recordings are performed in three conditions (before, during and after magnetotherapy) from electrodes placed in the scalp in the occipital region. For magnetotherapy procedure was used typical equipment with cylindrical coil of 60 cm diameter. We record EEG from 13 healthy volunteers for 3 types of sinusoidal pulses. The frequency analysis was performed for all recorded signals and was evaluating the power spectral density (PSD) for delta (0.5 to 4 Hz) and alpha (8 to 13 Hz) waves.