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1.
Sensors (Basel) ; 20(24)2020 Dec 21.
Artigo em Inglês | MEDLINE | ID: mdl-33371238

RESUMO

Photoplethysmography is an extensively-used, portable, and noninvasive technique for measuring vital parameters such as heart rate, respiration rate, and blood pressure. The deployment of this technology in veterinary medicine has been hindered by the challenges in effective transmission of light presented by the thick layer of skin and fur of the animal. We propose an injectable capsule system to circumvent these limitations by accessing the subcutaneous tissue to enable reliable signal acquisition even with lower light brightness. In addition to the reduction of power usage, the injection of the capsule offers a less invasive alternative to surgical implantation. Our current prototype combines two application-specific integrated circuits (ASICs) with a microcontroller and interfaces with a commercial light emitting diode (LED) and photodetector pair. These ASICs implement a signal-conditioning analog front end circuit and a frequency-shift keying (FSK) transmitter respectively. The small footprint of the ASICs is the key in the integration of the complete system inside a 40-mm long glass tube with an inner diameter of 4 mm, which enables its injection using a custom syringe similar to the ones used with microchip implants for animal identification. The recorded data is transferred wirelessly to a computer for post-processing by means of the integrated FSK transmitter and a software-defined radio. Our optimized LED duty cycle of 0.4% at a sampling rate of 200 Hz minimizes the contribution of the LED driver (only 0.8 mW including the front-end circuitry) to the total power consumption of the system. This will allow longer recording periods between the charging cycles of the batteries, which is critical given the very limited space inside the capsule. In this work, we demonstrate the wireless operation of the injectable system with a human subject holding the sensor between the fingers and the in vivo functionality of the subcutaneous sensing on a pilot study performed on anesthetized rat subjects.

2.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 4628-4631, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33019025

RESUMO

This paper demonstrates the design and manufacturing of a smart and connected internet-of-things collar system for the collection of behavioral and environmental information from working canines. The environmental factors of ambient light, ambient temperature, ambient noise levels, barometric pressure and relative humidity are recorded by the smart collar system in addition to behavioral information about barking incidences and activity levels. The data are collected from the sensors and transmitted via Bluetooth to the handler's smartphone where the custom app also acquires GPS positioning using the on-board smartphone sensors. The stored data on the smartphone are uploaded to the IBM Cloud once the user is connected to a WiFi network. The low power design of the smart collar system permits it to be used continuously for 27 hours with a 290 mAh lithium polymer battery. The cost of the system is low enough to let the handlers have multiple collars and exchange it if needed or recharge it overnight when not in use. This system is currently being scaled up to be tested on hundreds of canine puppies by a preeminent guide dog school in the US. As a result, the design emphasis here has been on the cost and power reduction, comfortable ergonomics, user friendliness, and robustness of data streaming. We expect the system to provide continuous quantitative data for improving guide dog training programs in addition to contributing the well-being of other working dogs in the future.


Assuntos
Smartphone , Animais , Coleta de Dados , Cães , Feminino , Registros , Contenções
3.
Integr Cancer Ther ; 19: 1534735420943278, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32815410

RESUMO

Animal-assisted interventions (AAIs) use human-animal interactions to positive effect in various contexts including cancer care. As the first installment of a 2-part series, this systematic literature review focuses on the research methods and quantitative results of AAI studies in oncology. We find methodological consistency in the use of canines as therapy animals, in the types of high-risk patients excluded from studies, and in the infection precautions taken with therapy animals throughout cancer wards. The investigated patient endpoints are not significantly affected by AAI, with the exceptions of improvements in oxygen consumption, quality of life, depression, mood, and satisfaction with therapy. The AAI field in oncology has progressed significantly since its inception and has great potential to positively affect future patient outcomes. To advance the field, future research should consistently improve the methodological design of studies, report data more completely, and focus more on the therapy animal's well-being.

4.
Sensors (Basel) ; 20(16)2020 Aug 11.
Artigo em Inglês | MEDLINE | ID: mdl-32796611

RESUMO

Disaster robotics is a growing field that is concerned with the design and development of robots for disaster response and disaster recovery. These robots assist first responders by performing tasks that are impractical or impossible for humans. Unfortunately, current disaster robots usually lack the maneuverability to efficiently traverse these areas, which often necessitate extreme navigational capabilities, such as centimeter-scale clearance. Recent work has shown that it is possible to control the locomotion of insects such as the Madagascar hissing cockroach (Gromphadorhina portentosa) through bioelectrical stimulation of their neuro-mechanical system. This provides access to a novel agent that can traverse areas that are inaccessible to traditional robots. In this paper, we present a data-driven inertial navigation system that is capable of localizing cockroaches in areas where GPS is not available. We pose the navigation problem as a two-point boundary-value problem where the goal is to reconstruct a cockroach's trajectory between the starting and ending states, which are assumed to be known. We validated our technique using nine trials that were conducted in a circular arena using a biobotic agent equipped with a thorax-mounted, low-cost inertial measurement unit. Results show that we can achieve centimeter-level accuracy. This is accomplished by estimating the cockroach's velocity-using regression models that have been trained to estimate the speed and heading from the inertial signals themselves-and solving an optimization problem so that the boundary-value constraints are satisfied.

5.
Integr Cancer Ther ; 19: 1534735420943269, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32698731

RESUMO

Animal-assisted interventions (AAIs) can improve patients' quality of life as complementary medical treatments. Part I of this 2-paper systematic review focused on the methods and results of cancer-related AAIs; Part II discusses the theories of the field's investigators. Researchers cite animal personality, physical touch, physical movement, distraction, and increased human interaction as sources of observed positive outcomes. These mechanisms then group under theoretical frameworks such as the social support hypothesis or the human-animal bond concept to fully explain AAI in oncology. The cognitive activation theory of stress, the science of unitary human beings, and the self-object hypothesis are additional frameworks mentioned by some researchers. We also discuss concepts of neurobiological transduction connecting mechanisms to AAI benefits. Future researchers should base study design on theories with testable hypotheses and use consistent terminology to report results. This review aids progress toward a unified theoretical framework and toward more holistic cancer treatments.

6.
Biosens Bioelectron ; 153: 112038, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-31989942

RESUMO

Comprehensive metabolic panels are the most reliable and common methods for monitoring general physiology in clinical healthcare. Translation of this clinical practice to personal health and wellness tracking requires reliable, non-invasive, miniaturized, ambulatory, and inexpensive systems for continuous measurement of biochemical analytes. We report the design and characterization of a wearable system with a flexible sensor array for non-invasive and continuous monitoring of human biochemistry. The system includes signal conditioning, processing, and transmission parts for continuous measurement of glucose, lactate, pH, and temperature. The system can operate three discrete electrochemical cells. The system draws 15 mA under continuous operation when powered by a 3.7 V 150 mAh battery. The analog front-end of the electrochemical cells has four potentiostats and three multiplexers for multiplexed and parallel readout from twelve working electrodes. Utilization of redundant working electrodes improves the measurement accuracy of sensors by averaging chronoamperometric responses across the array. The operation of the system is demonstrated in vitro by simultaneous measurement of glucose and lactate, pH, and skin temperature. In benchtop measurements, the sensors are shown to have sensitivities of 26.31 µA mM-1·cm-2 for glucose, 1.49 µA mM-1·cm-2 for lactate, 54 mV·pH-1 for pH, and 0.002 °C-1 for temperature. With the custom wearable system, these values were 0.84 ± 0.03 mV µM-1·cm-2 or glucose, 31.87 ± 9.03 mV mM-1·cm-2 for lactate, 57.18 ± 1.43 mV·pH-1 for pH, and 63.4 µV·°C-1 for temperature. This miniaturized wearable system enables future evaluation of temporal changes of the sweat biomarkers.


Assuntos
Técnicas Biossensoriais/instrumentação , Metaboloma/fisiologia , Monitorização Fisiológica/instrumentação , Dispositivos Eletrônicos Vestíveis , Dimetilpolisiloxanos/química , Técnicas Eletroquímicas , Eletrodos , Glucose/análise , Humanos , Concentração de Íons de Hidrogênio , Ácido Láctico/análise , Temperatura Cutânea , Propriedades de Superfície , Suor/química
7.
IEEE Trans Biomed Circuits Syst ; 13(5): 825-834, 2019 10.
Artigo em Inglês | MEDLINE | ID: mdl-31217129

RESUMO

Obtaining physiological data from animals in a non-obtrusive and continuous manner is important to veterinary science. This paper demonstrates the design and deployment of a miniaturized capsule-based system for subdermal injection to provide real-time and continuous heart-rate, movement, and core-body-temperature measurements. The presented device incorporates sensors for photoplethysmography, motion detection, and temperature measurements. A bluetooth-low-energy enabled microcontroller configures the sensors, digitizes the sensor information, and wirelessly connects with external devices. The device is powered by a CR425 battery for this paper, and various other battery solutions are available based upon the use case. The design uses only commercially available integrated circuits in order to reduce the development cost and be modular. The encapsulation is a combination of medical epoxy and poly(methyl methacrylate) that fits within a 6-gauge hypodermic needle. The preliminary evaluation of the device included an in vitro assessment of its thermal response and measurement accuracy, the impact of one-month implantation on surrounding tissue, the power consumption with duty cycling of various sensors, and a measurement of physiological signals in a rat and a chicken. Having a form factor and implantation method similar to existing devices for animals, this novel system is a useful platform for both scientists and veterinarians to better study a diverse range of animals.


Assuntos
Acelerometria , Fotopletismografia , Termografia , Tecnologia sem Fio/instrumentação , Acelerometria/instrumentação , Acelerometria/métodos , Animais , Galinhas , Movimento , Agulhas , Fotopletismografia/instrumentação , Fotopletismografia/métodos , Ratos , Termografia/instrumentação , Termografia/métodos
8.
Sensors (Basel) ; 19(3)2019 Jan 22.
Artigo em Inglês | MEDLINE | ID: mdl-30678188

RESUMO

Wearable health monitoring has emerged as a promising solution to the growing need for remote health assessment and growing demand for personalized preventative care and wellness management. Vital signs can be monitored and alerts can be made when anomalies are detected, potentially improving patient outcomes. One major challenge for the use of wearable health devices is their energy efficiency and battery-lifetime, which motivates the recent efforts towards the development of self-powered wearable devices. This article proposes a method for context aware dynamic sensor selection for power optimized physiological prediction using multi-modal wearable data streams. We first cluster the data by physical activity using the accelerometer data, and then fit a group lasso model to each activity cluster. We find the optimal reduced set of groups of sensor features, in turn reducing power usage by duty cycling these and optimizing prediction accuracy. We show that using activity state-based contextual information increases accuracy while decreasing power usage. We also show that the reduced feature set can be used in other regression models increasing accuracy and decreasing energy burden. We demonstrate the potential reduction in power usage using a custom-designed multi-modal wearable system prototype.


Assuntos
Actigrafia/instrumentação , Fontes de Energia Elétrica/economia , Telemedicina/economia , Dispositivos Eletrônicos Vestíveis/economia , Acelerometria/estatística & dados numéricos , Análise por Conglomerados , Humanos , Dispositivos Eletrônicos Vestíveis/normas
9.
Annu Int Conf IEEE Eng Med Biol Soc ; 2018: 2877-2880, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30441002

RESUMO

Down syndrome is one of the health disorders that interferes with regular and healthy sleep. Most children with Down syndrome are referred to a sleep clinic for the assessment of the severity of their apnea. Regular polysomnography based assessment of apnea has been challenging with this sensitive patient population. We present our efforts towards developing a flexible adhesive bandage sized near infrared spectroscopy system (pediBand) for home-assessment of apnea in children with Down syndrome. Combined with inertial measurement units, pediBand record heart rate, heart rate variability, respiratory rate, arterial oxygen saturation and cerebral oxygen saturation. These are the essential parameters to assess sleep apnea and could also potentially be used in the assessment of sleep performance in general. A modified version of pediBand system was evaluated on adult patients and successfully demonstrated the changes in hemodynamic system triggered by sleep apnea.


Assuntos
Síndrome de Down , Síndromes da Apneia do Sono , Criança , Humanos , Oximetria , Polissonografia , Espectroscopia de Luz Próxima ao Infravermelho
10.
Annu Int Conf IEEE Eng Med Biol Soc ; 2018: 2881-2884, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30441003

RESUMO

Habitual snoring has been known to increase the risk for serious health problems in addition to affecting the quality of others' sleep. Several recent consumer products aim to automatically detect snoring events and wake the snorer to elicit a posture change. In this paper, we present a study comparing two of the methods, electromyography vs. accelerometry, proposed for automated snoring detection and incorporation of these into a wearable system. The study includes (a) the testing of various sensor configurations and placements to obtain optimal electromyography and accelerometry signals, (b) a review of the accuracy of a variety of snore detection algorithms from previously attained biological signals, and (3) design of an embedded device with integrated sensors and haptic feedback capability. Our preliminary results indicate superiority of accelerometry over electromyography. Further research opportunities to prove the concept and improve the design are then detailed for future work.


Assuntos
Algoritmos , Ronco , Acelerometria , Eletromiografia , Humanos , Sono
11.
Annu Int Conf IEEE Eng Med Biol Soc ; 2018: 4347-4350, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30441316

RESUMO

Animal-assisted therapies (AAT) are becoming increasingly common to help hospitalized patients, especially in oncology units. There is a critical need for methods and technologies that can enable a quantifiable understanding of AAT to objectively demonstrate its efficacy and improve its efficiency. In this paper, we present our preliminary efforts towards the development of wireless sensor systems to simultaneously detect the related behavioral (activity level, movement, stroking) and physiological signals (heart rate/variability) of humans and animals during their interaction. To detect heart rate, we tested two different techniques based on wearable or contactless electrocardiography. In this preliminary evaluation, we were able to assess these parameters successfully and identify the design challenges towards deployment of these systems in larger clinical studies.


Assuntos
Terapia Assistida com Animais , Animais , Cães , Eletrocardiografia , Frequência Cardíaca , Humanos
12.
PLoS One ; 13(10): e0203880, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30303994

RESUMO

Biobotics investigates the use of live insects as biological robots whose locomotion can be controlled by neurostimulation through implanted electrodes. Inactivity in the biobots (biological robots) can sometimes be noticed following extended neurostimulation, partly owing to incompatibility of implanted electrodes with the biobotic application or gradual degradation of the tissue-electrode interface. Implanted electrodes need to sufficiently exhibit consistent, reliable, and stable performance during stimulation experiments, have low tissue-electrode impedance, facilitate good charge injection capacity, and be compact in size or shape. Towards the goal of finding such electrodes suitable for biobotic applications, we compare electrochemical performances of five different types of electrodes in vitro with a saline based electrolytic medium. These include stainless steel wire electrodes, microfabricated flexible gold electrodes coated with PEDOT:PSS conductive polymer, eutectic gallium indium (EGaIn) in a tube, and "hybrid" stainless steel electrodes coated with EGaIn. We also performed accelerated aging of the electrodes to help estimate their longitudinal performance. Based on our experimentation, microfabricated electrodes with PEDOT:PSS and stainless steel electrodes coated with EGaIn performed remarkably well. This is the first time conductive polymer and liquid metal electrodes were studied comparatively for neurostimulation applications. These in vitro comparison results will be used in the future to provide a benchmark for subsequent in vivo tests with implanted electrodes in cockroach biobots.


Assuntos
Baratas/fisiologia , Gálio/química , Índio/química , Robótica/instrumentação , Animais , Materiais Revestidos Biocompatíveis/química , Condutividade Elétrica , Impedância Elétrica , Estimulação Elétrica , Neuroestimuladores Implantáveis , Microeletrodos , Aço Inoxidável
13.
IEEE Pulse ; 8(5): 27-30, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28961093

RESUMO

Imagine a natural disaster, such as an earthquake, causing residential buildings to collapse and trapping the people inside underneath the rubble. Over the following days, first responders spend a significant amount of time locating survivors. Despite having the assistance of life-detection tools and techniques, these first responders are still hampered by certain limitations in searching for survivors and pinpointing their exact location deep within the rubble. Current methods involving dogs and relatively large robots and machinery can assist only with surface-level surveying of the disaster area and removal of rubble. In contrast, a swarm of centimeter-scale robots could be employed for under-rubble mapping and surveying in these scenarios. In fact, progress has been made in developing centimeter-scale robotics that could assist first responders in the future. However, these prototypes still require improvements in the efficiency of the mechanical parts and control systems deployed in real-life scenarios.


Assuntos
Desastres , Trabalho de Resgate , Robótica , Animais , Cães , Humanos , Reprodutibilidade dos Testes
14.
Adv Clin Exp Med ; 26(3): 467-473, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28791822

RESUMO

BACKGROUND: Atherosclerosis, a chronic inflammatory disorder of the arteries, is responsible for the greatest number of deaths in westernized societies, with numbers increasing at a marked rate in developing countries. Coronary calcium score (CCS), carotid intima-media thickness (CIMT) and pregnancy-associated plasma protein A (PAPP-A) are predictors for the development of atherosclerosis. OBJECTIVES: This study was aimed to investigate the relationship between CCS, CIMT and PAPP-A for earlier diagnosis of atherosclerosis. MATERIAL AND METHODS: A total of 99 patients were included in the study. Coronary computerized tomography (CT) angiography was performed on all patients. The calcium scoring technique was performed using a sequential scanning mode. CIMT measurement was done through the area 1 cm distal of the bulbus arteriosus with carotid Doppler ultrasound. PAPP-A values were analyzed by double immunoenzymatic technique. RESULTS: Out of 99 patients, 63 were found with coronary atherosclerosis using multislice computed tomography (MSCT) coronary angiography. When the cut-off point for CCS was taken to be 0.40, the sensitivity of this parameter was 97% and its specificity was 68.3%. When the cut-off point for CIMT was taken to be 0.60, the sensitivity and the specificity of these parameters were 75.0% and 87.3%, respectively, for the right measurements and 75.0% and 79.4%, respectively, for the left measurements. CONCLUSIONS: This data support the conclusion that PAPP-A, like CCS and CIMT, is a parameter that can be used to detect subclinical atherosclerosis.


Assuntos
Biomarcadores/metabolismo , Cálcio/metabolismo , Doença da Artéria Coronariana/sangue , Doença da Artéria Coronariana/metabolismo , Proteína Plasmática A Associada à Gravidez/metabolismo , Adulto , Idoso , Idoso de 80 Anos ou mais , Biomarcadores/sangue , Artérias Carótidas/metabolismo , Espessura Intima-Media Carotídea , Angiografia Coronária/métodos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Gravidez , Fatores de Risco , Sensibilidade e Especificidade
15.
IEEE Trans Biomed Circuits Syst ; 11(3): 487-496, 2017 06.
Artigo em Inglês | MEDLINE | ID: mdl-28489547

RESUMO

A compressive sampling (CS) photoplethysmographic (PPG) readout with embedded feature extraction to estimate heart rate (HR) directly from compressively sampled data is presented. It integrates a low-power analog front end together with a digital back end to perform feature extraction to estimate the average HR over a 4 s interval directly from compressively sampled PPG data. The application-specified integrated circuit (ASIC) supports uniform sampling mode (1x compression) as well as CS modes with compression ratios of 8x, 10x, and 30x. CS is performed through nonuniformly subsampling the PPG signal, while feature extraction is performed using least square spectral fitting through Lomb-Scargle periodogram. The ASIC consumes 172  µ W of power from a 1.2 V supply while reducing the relative LED driver power consumption by up to 30 times without significant loss of relevant information for accurate HR estimation.


Assuntos
Compressão de Dados , Frequência Cardíaca , Pletismografia , Processamento de Sinais Assistido por Computador , Humanos
16.
Adv Healthc Mater ; 6(6)2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28128888

RESUMO

A wearable skin hydration sensor in the form of a capacitor is demonstrated based on skin impedance measurement. The capacitor consists of two interdigitated or parallel electrodes that are made of silver nanowires (AgNWs) in a polydimethylsiloxane (PDMS) matrix. The flexible and stretchable nature of the AgNW/PDMS electrode allows conformal contact to the skin. The hydration sensor is insensitive to the external humidity change and is calibrated against a commercial skin hydration system on an artificial skin over a wide hydration range. The hydration sensor is packaged into a flexible wristband, together with a network analyzer chip, a button cell battery, and an ultralow power microprocessor with Bluetooth. In addition, a chest patch consisting of a strain sensor, three electrocardiography electrodes, and a skin hydration sensor is developed for multimodal sensing. The wearable wristband and chest patch may be used for low-cost, wireless, and continuous monitoring of skin hydration and other health parameters.


Assuntos
Nanofios , Estado de Hidratação do Organismo , Prata , Dispositivos Eletrônicos Vestíveis , Tecnologia sem Fio , Eletrodos , Humanos
17.
Breast J ; 23(2): 159-163, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-27813225

RESUMO

To investigate the effect of US performed immediately before breast conserving surgery (BCS) by radiologist accompanied by the surgeon. All patients scheduled for BCS in the last year (group 1, n = 46) were evaluated with US immediately before surgery. About 108 patients (group 2) who were treated with BCS before the study were included as the control group. Tumor size and localization, the distances between tumor-skin and tumor-pectoralis muscle fascia were noted. Re-excision rate due to positive margins was significantly lower in group 1. Statistically significant difference was detected in re-excision rates for nonpalpable tumors. Preoperative US is an effective and practical method.


Assuntos
Neoplasias da Mama/diagnóstico por imagem , Neoplasias da Mama/cirurgia , Mastectomia Segmentar/métodos , Ultrassonografia Mamária , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias da Mama/patologia , Feminino , Humanos , Margens de Excisão , Pessoa de Meia-Idade , Músculos Peitorais , Cuidados Pré-Operatórios , Estudos Prospectivos , Adulto Jovem
18.
IEEE J Biomed Health Inform ; 20(5): 1251-1264, 2016 09.
Artigo em Inglês | MEDLINE | ID: mdl-27249840

RESUMO

We present our efforts toward enabling a wearable sensor system that allows for the correlation of individual environmental exposures with physiologic and subsequent adverse health responses. This system will permit a better understanding of the impact of increased ozone levels and other pollutants on chronic asthma conditions. We discuss the inefficiency of existing commercial off-the-shelf components to achieve continuous monitoring and our system-level and nano-enabled efforts toward improving the wearability and power consumption. Our system consists of a wristband, a chest patch, and a handheld spirometer. We describe our preliminary efforts to achieve a submilliwatt system ultimately powered by the energy harvested from thermal radiation and motion of the body with the primary contributions being an ultralow-power ozone sensor, an volatile organic compounds sensor, spirometer, and the integration of these and other sensors in a multimodal sensing platform. The measured environmental parameters include ambient ozone concentration, temperature, and relative humidity. Our array of sensors also assesses heart rate via photoplethysmography and electrocardiography, respiratory rate via photoplethysmography, skin impedance, three-axis acceleration, wheezing via a microphone, and expiratory airflow. The sensors on the wristband, chest patch, and spirometer consume 0.83, 0.96, and 0.01 mW, respectively. The data from each sensor are continually streamed to a peripheral data aggregation device and are subsequently transferred to a dedicated server for cloud storage. Future work includes reducing the power consumption of the system-on-chip including radio to reduce the entirety of each described system in the submilliwatt range.


Assuntos
Asma/diagnóstico , Monitorização Ambulatorial/instrumentação , Monitorização Ambulatorial/métodos , Doença Crônica , Impedância Elétrica , Eletrocardiografia , Desenho de Equipamento , Humanos , Fotopletismografia , Pele/fisiopatologia , Espirometria
19.
Annu Int Conf IEEE Eng Med Biol Soc ; 2016: 2141-2144, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-28268755

RESUMO

Biobotics is an emerging and useful advent in the field of robotics which harnesses the mechanical power of live invertebrates and benefits from them as "working" animals. Most biobotic applications rely on neural or muscular stimulation through implanted electrodes for achieving direct control of their locomotory behavior. Degradation of stimulation efficiency is often noticed through extended usage, partly owing to incompatibility of implanted electrodes to the application. Our previous achievements in biobotics utilized commercially available stainless steel wires as stimulation electrodes due to its availability and lower cost. In this study, we look into the potential of using a liquid metal alloy, eutectic gallium-indium (EGaIn), as a means of enhancing properties of the stainless steel electrodes and its first time consideration as in vivo neurostimulation electrodes. We present in vitro analysis of the electrodes in terms of the electrolyte-electrode interface impedance and interface equivalent circuit model.


Assuntos
Ligas/química , Biotecnologia/instrumentação , Gálio/química , Índio/química , Robótica/instrumentação , Aço Inoxidável/química , Impedância Elétrica , Eletrodos
20.
Annu Int Conf IEEE Eng Med Biol Soc ; 2016: 2184-2187, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-28268764

RESUMO

Biobotic research involving neurostimulation of instrumented insects to control their locomotion is finding potential as an alternative solution towards development of centimeter-scale distributed swarm robotics. To improve the reliability of biobotic agents, their control mechanism needs to be precisely characterized. To achieve this goal, this paper presents our initial efforts for statistical assessment of the angular response of roach biobots to the applied bioelectrical stimulus. Subsequent findings can help to understand the effect of each stimulation parameter individually or collectively and eventually reach reliable and consistent biobotic control suitable for real life scenarios.


Assuntos
Biônica , Estimulação Elétrica , Robótica , Animais , Comportamento Animal , Baratas/fisiologia
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