In this paper, a novel antenna is proposed for high-temperature testing, which can make the high-temperature pressure characteristics of a wireless passive ceramic pressure sensor demonstrated at up to a temperature o...In this paper, a novel antenna is proposed for high-temperature testing, which can make the high-temperature pressure characteristics of a wireless passive ceramic pressure sensor demonstrated at up to a temperature of 600℃. The design parameters of the antenna are similar to those of the sensor, which will increase the coupling strength between the sensor and testing antenna. The antenna is fabricated in thick film integrated technology, and the properties of the alumina ceramic and silver ensure the feasibility of the antenna in high-temperature environments. The sensor, coupled with the ceramic antenna, is investigated using a high-temperature pressure testing platform. The experimental measurement results show that the pressure signal in a harsh environment can be detected by the frequency diversity of the sensor.展开更多
Objective:To develop and bench-validate a fully passive,wireless implantable pressure monitoring system(WIPS)for on-demand assessment of intra-sac pressure in patients with endovascular aneurysm repair(EVAR)for abdomi...Objective:To develop and bench-validate a fully passive,wireless implantable pressure monitoring system(WIPS)for on-demand assessment of intra-sac pressure in patients with endovascular aneurysm repair(EVAR)for abdominal aortic aneurysms.Methods:WIPS includes a flexible 15 mm×145 mm implant integrating four pressure sensors(MS5839),an RFID tag(ST25DV04KC),and an ultra-low-power microcontroller(STM32L011).The device is powered wirelessly via 13.56 MHz RFID,enabling pressure measurements at configurable resolutions without need for batteries.Data is stored locally and retrieved via an external Reader(RD520).Benchtop tests evaluated power consumption,telemetry range,and sensor linearity in air,heated saline,and a biologically representative meat model.Uniform 1μm and 2μm Parylene C coatings were applied intentionally,as two predefined thickness conditions,to evaluate biocompatibility without compromising sensor performance.Results:Total power consumption remained below 4 mW across all oversampling ratios(OSRs).In free air,reliable telemetry was achieved up to 24 cm at 6 W Reader output.Heated mineral water reduced the optimal distance to 16 cm,and physiological saline limited it to 4 cm.In the Meat Model,a fixed 18 cm tissue path yielded 100%link reliability for OSR≤1024 at 5 W.Parylene C coatings did not alter pressure linearity or hysteresis.The strip is compatible with a 20 F delivery sheath,suggesting compatibility with standard EVAR catheters.Conclusions:WIPS combines low power consumption,deep-tissue wireless telemetry,and catheter-based deliverability,addressing longstanding limitations in implantable EVAR surveillance tools.These benchtop findings support feasibility for future in vivo testing in large animal models to validate long-term safety and clinical integration.展开更多
This paper presents a novel readout system for wireless passive pressure sensors based on the inductively coupled inductor and cavity （LC） resonant circuits. The proposed system consists of a reader antenna inductiv...This paper presents a novel readout system for wireless passive pressure sensors based on the inductively coupled inductor and cavity （LC） resonant circuits. The proposed system consists of a reader antenna inductively coupled to the sensor circuit, a readout circuit, and a personal computer （PC） post processing unit. The readout circuit generates a voltage signal representing the sensor＇s capacitance. The frequency of the reader antenna driving signal is a constant, which is equal to the sensor＇s resonant frequency at zero pressure. Based on mechanical and electrical modeling, the pressure sensor design based on the high temperature co-fired ceramic （HTCC） technology is conducted and discussed. The functionality and accuracy of the readout system are tested with a voltage-capacitance measurement system and demonstrated in a realistic pressure measurement environment, so that the overall performance and the feasibility of the readout system are proved.展开更多
基金Project supported by the National Natural Science Foundation for Distinguished Young Scholars,China(Grant No.51425505)the National Natural Science Foundation of China(Grant No.61471324)+1 种基金the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi Province,China(Grant No.2013-077)the Graduate Students Outstanding Innovation Project of Shanxi Province,China(Grant No.20143020)
文摘In this paper, a novel antenna is proposed for high-temperature testing, which can make the high-temperature pressure characteristics of a wireless passive ceramic pressure sensor demonstrated at up to a temperature of 600℃. The design parameters of the antenna are similar to those of the sensor, which will increase the coupling strength between the sensor and testing antenna. The antenna is fabricated in thick film integrated technology, and the properties of the alumina ceramic and silver ensure the feasibility of the antenna in high-temperature environments. The sensor, coupled with the ceramic antenna, is investigated using a high-temperature pressure testing platform. The experimental measurement results show that the pressure signal in a harsh environment can be detected by the frequency diversity of the sensor.
文摘Objective:To develop and bench-validate a fully passive,wireless implantable pressure monitoring system(WIPS)for on-demand assessment of intra-sac pressure in patients with endovascular aneurysm repair(EVAR)for abdominal aortic aneurysms.Methods:WIPS includes a flexible 15 mm×145 mm implant integrating four pressure sensors(MS5839),an RFID tag(ST25DV04KC),and an ultra-low-power microcontroller(STM32L011).The device is powered wirelessly via 13.56 MHz RFID,enabling pressure measurements at configurable resolutions without need for batteries.Data is stored locally and retrieved via an external Reader(RD520).Benchtop tests evaluated power consumption,telemetry range,and sensor linearity in air,heated saline,and a biologically representative meat model.Uniform 1μm and 2μm Parylene C coatings were applied intentionally,as two predefined thickness conditions,to evaluate biocompatibility without compromising sensor performance.Results:Total power consumption remained below 4 mW across all oversampling ratios(OSRs).In free air,reliable telemetry was achieved up to 24 cm at 6 W Reader output.Heated mineral water reduced the optimal distance to 16 cm,and physiological saline limited it to 4 cm.In the Meat Model,a fixed 18 cm tissue path yielded 100%link reliability for OSR≤1024 at 5 W.Parylene C coatings did not alter pressure linearity or hysteresis.The strip is compatible with a 20 F delivery sheath,suggesting compatibility with standard EVAR catheters.Conclusions:WIPS combines low power consumption,deep-tissue wireless telemetry,and catheter-based deliverability,addressing longstanding limitations in implantable EVAR surveillance tools.These benchtop findings support feasibility for future in vivo testing in large animal models to validate long-term safety and clinical integration.
文摘This paper presents a novel readout system for wireless passive pressure sensors based on the inductively coupled inductor and cavity （LC） resonant circuits. The proposed system consists of a reader antenna inductively coupled to the sensor circuit, a readout circuit, and a personal computer （PC） post processing unit. The readout circuit generates a voltage signal representing the sensor＇s capacitance. The frequency of the reader antenna driving signal is a constant, which is equal to the sensor＇s resonant frequency at zero pressure. Based on mechanical and electrical modeling, the pressure sensor design based on the high temperature co-fired ceramic （HTCC） technology is conducted and discussed. The functionality and accuracy of the readout system are tested with a voltage-capacitance measurement system and demonstrated in a realistic pressure measurement environment, so that the overall performance and the feasibility of the readout system are proved.
