An Integrated Wireless, Full-Range, Capacitive Sensor System Designed for Measuring Ventricular Pressure

Hernández-Sebastián, Natiely; Díaz-Alonso, Daniela; Renero-Carrillo, Francisco Javier; Villa-Villaseñor, Noé; Calleja-Arriaga, W.

doi:10.20944/preprints201807.0107.v1

2018

DOI: 10.20944/preprints201807.0107.v1

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An Integrated Wireless, Full-Range, Capacitive Sensor System Designed for Measuring Ventricular Pressure

Natiely Hernández-Sebastián¹,

Daniela Díaz-Alonso²,

Francisco Javier Renero-Carrillo³

et al.

Abstract: This paper reports the novel design of a touch mode capacitive pressure sensor 11(TMCPS) system with a wireless approach for a full-range continuous monitoring of ventricular 12 pressure. The system consists of two modules: an implantable set and an external reading device. 13The implantable set, restricted to a 2x2 cm 2 area, consists of a TMCPS array connected with a 14 dual-layer coil, for making a reliable resonant circuit for communication with the external device. 15The capacitive array is modelled consi… Show more

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Cited by 6 publications

References 26 publications

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Design and Analysis of an Inductive Coupling System for the Early Detection of Heart Failure

et al. 2023

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Heart failure is a common, complex clinical syndrome with high morbidity and mortality. Hemodynamic parameter evaluation is useful for early detection, clinical outcome monitoring, timely treatment, and the overall prognosis of heart failure patients. Therefore, continuous monitoring of hemodynamic parameters helps in the evaluation of patients with suspected heart failure. The hemodynamic parameters change with respect to the contraction and expansion of the heart. Hence, in this research, two circuit-less 30 mm spherical receiver coils were implanted in both the left and right sides of the heart and an external transceiver coil was placed above the chest. The changes in the reflection coefficient of the transceiver coil at the resonant frequency changed depending on the distance between the implanted coils, allowing the contraction and expansion of the heart to be determined. This work was carried out at 13.56 MHz, considering the safety limits imposed by the FCC. The proposed reflection coefficient monitoring technique may distinguish healthy patients from heart failure and heart attack patients. The reflection coefficients at a maximum distance of 50 mm for simulation and measurement are −10.3 dB and −10.6 dB, respectively, at the resonant frequency.

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Design and Analysis of an Inductive Coupling System for the Early Detection of Heart Failure

et al. 2023

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Biocompatibility of Polyimides: A Mini-Review

Constantin

Aflori

Damian³

et al. 2019

Materials

141

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Polyimides (PIs) represent a benchmark for high-performance polymers on the basis of a remarkable collection of valuable traits and accessible production pathways and therefore have incited serious attention from the ever-demanding medical field. Their characteristics make them suitable for service in hostile environments and purification or sterilization by robust methods, as requested by most biomedical applications. Even if PIs are generally regarded as “biocompatible”, proper analysis and understanding of their biocompatibility and safe use in biological systems deeply needed. This mini-review is designed to encompass some of the most robust available research on the biocompatibility of various commercial or noncommercial PIs and to comprehend their potential in the biomedical area. Therefore, it considers (i) the newest concepts in the field, (ii) the chemical, (iii) physical, or (iv) manufacturing elements of PIs that could affect the subsequent biocompatibility, and, last but not least, (v) in vitro and in vivo biocompatibility assessment and (vi) reachable clinical trials involving defined polyimide structures. The main conclusion is that various PIs have the capacity to accommodate in vivo conditions in which they are able to function for a long time and can be judiciously certified as biocompatible.

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Design of a Fully Integrated Inductive Coupling System: A Discrete Approach Towards Sensing Ventricular Pressure

Hernández-Sebastián

Villa-Villaseñor

Renero-Carrillo

et al. 2020

Sensors

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In this paper, an alternative strategy for the design of a bidirectional inductive power transfer (IPT) module, intended for the continuous monitoring of cardiac pressure, is presented. This new integrated implantable medical device (IMD) was designed including a precise ventricular pressure sensor, where the available implanting room is restricted to a 1.8 × 1.8 cm2 area. This work considers a robust magnetic coupling between an external reading coil and the implantable module: a three-dimensional inductor and a touch mode capacitive pressure sensor (TMCPS) set. In this approach, the coupling modules were modelled as RCL circuits tuned at a 13.56 MHz frequency. The analytical design was validated by means of Comsol Multiphysics, CoventorWare, and ANSYS HFSS software tools. A power transmission efficiency (PTE) of 94% was achieved through a 3.5 cm-thick biological tissue, based on high magnitudes for the inductance (L) and quality factor (Q) components. A specific absorption rate (SAR) of less than 1.6 W/Kg was attained, which suggests that this IPT system can be implemented in a safe way, according to IEEE C95.1 safety guidelines. The set of inductor and capacitor integrated arrays were designed over a very thin polyimide film, where the 3D coil was 18 mm in diameter and approximately 50% reduced in size, considering any conventional counterpart. Finally, this new approach for the IMD was under development using low-cost thin film manufacturing technologies for flexible electronics. Meanwhile, as an alternative test, this novel system was fabricated using a discrete printed circuit board (PCB) approach, where preliminary electromagnetic characterization demonstrates the viability of this bidirectional IPT design.

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An Integrated Wireless, Full-Range, Capacitive Sensor System Designed for Measuring Ventricular Pressure

Cited by 6 publications

References 26 publications

Design and Analysis of an Inductive Coupling System for the Early Detection of Heart Failure

Design and Analysis of an Inductive Coupling System for the Early Detection of Heart Failure

Biocompatibility of Polyimides: A Mini-Review

Design of a Fully Integrated Inductive Coupling System: A Discrete Approach Towards Sensing Ventricular Pressure

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