Grupo: ECsenshttps://hdl.handle.net/10481/479462024-03-29T07:55:40Z2024-03-29T07:55:40ZBed-based ballistocardiography system using flexible RFID sensors for non-invasive single- and dual-subject vital signs monitoringEscobedo Araque, PabloPousibet, AntonioLópez Ruiz, NuriaCarvajal, Miguel A.Palma, Alberto J.Martínez Olmos, Antoniohttps://hdl.handle.net/10481/901202024-03-20T13:27:44ZBed-based ballistocardiography system using flexible RFID sensors for non-invasive single- and dual-subject vital signs monitoring
Escobedo Araque, Pablo; Pousibet, Antonio; López Ruiz, Nuria; Carvajal, Miguel A.; Palma, Alberto J.; Martínez Olmos, Antonio
This work presents an innovative approach employing passive radio frequency identification (RFID) technology to develop a comprehensive ballistocardiography (BCG) system for contactless and noninvasive vital sign monitoring of individuals on a mattress. The method relies on wireless energy transfer through inductive coupling at 13.56 MHz between an active powering board and a passive, flexible sensing board with dimensions of 12.6×4.7 cm2. Both boards face each other at a separation distance of 3 cm. The system demonstrates remarkable sensitivity to mattress vibrations resulting from bodily movements, rendering it proficient in generating complete BCG signals capable of discerning heart rate (HR), breathing rate (BR), and activity. Practical trials with six healthy subjects validated the feasibility and efficacy of the system, showing an average absolute error of 1.8 beats/min for HR and 0.6 breaths/min for BR. Unlike conventional BCG systems, the sensing module seamlessly integrates into the mattress side. This is leveraged to enable the simultaneous monitoring of two subjects on a queen-size mattress, taking advantage of the local sensitivity of the sensing mechanism. Extracted BCG values can be wirelessly transmitted to the user’s smartphone through near-field communication (NFC) and to a cloud service used for storage, distribution, and categorization of subject data. This work establishes a foundation for future extensive studies and applications, as the obtained BCG signals could provide health-related insights, such as detecting heart diseases, respiratory problems, or evaluating sleep quality.
POC device for rapid oral pH determination based on a smartphone platformArroyo, Manuel J.Escobedo Araque, PabloRuiz García, IsidoroPalma López, Alberto JoséSantoyo González, FranciscoOrtega Muñoz, MarianoCapitán Vallvey, Luis FermínErenas Rodríguez, Miguel Maríahttps://hdl.handle.net/10481/895192024-02-26T07:42:49ZPOC device for rapid oral pH determination based on a smartphone platform
Arroyo, Manuel J.; Escobedo Araque, Pablo; Ruiz García, Isidoro; Palma López, Alberto José; Santoyo González, Francisco; Ortega Muñoz, Mariano; Capitán Vallvey, Luis Fermín; Erenas Rodríguez, Miguel María
Salivary pH serves as a valuable and useful diagnostic marker for periodontal disease, as it not only plays a critical role in disease prevention but also in its development. Typically, saliva sampling is collected by draining and spitting it into collec- tion tubes or using swabs. In this study, we have developed a Point-of-Care (POC) device for in situ determination of oral pH without the need for complex instruments, relying solely on a smartphone as the detection device. Our system utilizes a non-toxic vegetable colourimetric indicator, immobilized on a chitosan membrane located on a disposable stick, enabling direct sampling within the buccal cavity. An ad hoc designed 3D-printed attachment is used to ensure accurate positioning and alignment of the stick, as well as isolation from external lighting conditions. A custom-developed smartphone application captures and automatically processes the image of the sensing membrane, providing the salivary pH results. After optimiz- ing the cocktail composition, the developed sensors demonstrated the capacity to determine pH within a range of 5.4 to 8.1 with a remarkable precision of 0.6%, achieving a very short analysis time of just 1 min. A stability study conducted on the sensing membranes revealed a lifetime of 50 days. To validate the performance of our analytical device, we compared its results against those obtained from a calibrated pH-meter, using a group of individuals. The device exhibited an average error of 2.4% when compared with the pH-meter results, confirming its reliability and accuracy
Use of digital reflection devices for measurement using hue-based optical sensorsErenas Rodríguez, Miguel MaríaCantrell, KevinBallesta Claver, JulioOrbe Payá, Ignacio DeCapitán Vallvey, Luis Fermínhttps://hdl.handle.net/10481/872642024-01-25T10:37:01ZUse of digital reflection devices for measurement using hue-based optical sensors
Erenas Rodríguez, Miguel María; Cantrell, Kevin; Ballesta Claver, Julio; Orbe Payá, Ignacio De; Capitán Vallvey, Luis Fermín
In this paper the hue, or H component of the HSV (hue, saturation, value) color space, is used as analytical parameter for bitonal optical sensors. This parameter is characterized by its robustness to variations in the imaging device, illuminant, and sensor membrane. It has a higher precision than either traditional optical parameters, such as absorbance or transflectance, or other color parameters such as RGB coordinates. Here the hue is calculated from digital images obtained in reflection mode (digital camera) rather than images in transmission mode (digital scanner) as demonstrated in previous work. The stability of the H parameter, makes it possible to greatly simplify the procedure used for the optical sensors as well as to use ubiquitous digital cameras to acquire the image.
A surface fit approach with a disposable optical tongue for alkaline ion analysisErenas Rodríguez, Miguel MaríaPiñeiro, ÓscarPegalajar Cuéllar, ManuelOrbe Payá, Ignacio DeCapitán Vallvey, Luis FermínPegalajar Jiménez, María Del Carmenhttps://hdl.handle.net/10481/872562024-01-25T10:03:03ZA surface fit approach with a disposable optical tongue for alkaline ion analysis
Erenas Rodríguez, Miguel María; Piñeiro, Óscar; Pegalajar Cuéllar, Manuel; Orbe Payá, Ignacio De; Capitán Vallvey, Luis Fermín; Pegalajar Jiménez, María Del Carmen
A disposable optical tongue for the alkaline ions Na(I) and K(I) is described. The two-sensor layout prepared on a transparent support consists of non-specific polymeric membranes working by ionophore-chromoionophore chemistry. The non-specific behavior of the membranes was controlled by means of the crown ether-type ionophore present. The imaging of the tongue, after reaction for 3 min with the unknown solution, by means of a conventional flatbed scanner working by transmission mode, makes it possible to calculate the H (hue) value of the hue, saturation, value (HSV) color space used as a robust and precise analytical parameter. The modelling of the response of the two-sensor tongue as a sigmoidal surface is used to characterize the behavior of the tongue and as a basis to infer the concentration values. To compute the concentration of two analytes from the two hue values obtained using the optical tongue, a surface fit approach was used. The tongue works over a wide dynamic range (1.0×10(-4)-0.1 M both in Na(I) and K(I)). The sensing membranes show good intramembrane (1.4% RSD) and intermembrane precision (0.71% RSD) and lifetime (around 45 days in darkness). The procedure was used to analyze Na(I) and K(I) in different types of natural waters (tap and mineral), validating the results against a reference procedure.
Disposable optical tongue for alkaline ion analysisErenas Rodríguez, Miguel MaríaPegalajar Cuéllar, ManuelPegalajar Jiménez, María Del CarmenOrbe Payá, Ignacio DeCapitán Vallvey, Luis Fermínhttps://hdl.handle.net/10481/872542024-01-25T09:50:52ZDisposable optical tongue for alkaline ion analysis
Erenas Rodríguez, Miguel María; Pegalajar Cuéllar, Manuel; Pegalajar Jiménez, María Del Carmen; Orbe Payá, Ignacio De; Capitán Vallvey, Luis Fermín
A disposable optical tongue has been developed with a two-sensor array prepared on a transparent support. The array consists of polymeric membranes working by ionophore-chromoionophore chemistry with non-specific behaviour controlled by the crown ether-type ionophore present. The system was used for the simultaneous determination of Na(I) and K(I) ions in natural waters. The imaging of the element - after reaction for 3 min with the solution - by a conventional scanner makes it possible to calculate the hue coordinate H of the HSV colour space used as the analytical parameter. The signals were processed using an optimized multilayer Artificial Neural Network (ANN). The individual sensing membranes show good precision (0.3% RSD) and lifetime (around 45 days in darkness). The tongue works over a wide dynamic range (1.0 × 10 -4 to 0.1 M both in Na(I) and K(I)) and when the procedure was applied, the Mean Square Error obtained by the ANN approach was 0.0064 for the prediction of K(I) and 0.0451 for Na(I). The procedure was used to analyze Na(I) and K(I) in different types of natural waters (tap and mineral), validating the results against a reference procedure.