Browsing by Author "Lee, Yung-Pin"

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A New Non-Invasive Cuff-Less Blood Pressure Sensor
(2013)
Tu, Tse-Yi
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Chao, Paul C. -P.
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Lee, Yung-Pin
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電機工程學系
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Department of Electrical and Computer Engineering
A non-invasive, cuff-less, capable of continuous detection and low cost blood pressure sensor is proposed in this study. The proposed blood pressure sensor has a specially-designed strain sensor attached to a flexible plate and encapsulated by a gel module. The sensor is able to detect pulse signals of the artery vibration under the skin of a human wrist by a simple, flexible attachment pad. The strain sensor is expected to vibrate in a synchronized fashion with artery pulsation. The pulse vibration is expected to be transmitted to the strain sensor through the gel module. This module is made of highly bio-compatible materials like polyethylene (PE), polyurethane (PU), polytetrafluoroethylene (PTFE), polydimethylsiloxane (PDMS), or polymethylmethacrylate (PMMA). The gel module supports the strain sensor to a stability condition with top surface contacting tightly with the human skin while the bottom surface is under a low pressure exerted by a pressurizing wrist belt.
Feed-forward pulse width modulation for high line regulation buck or boost converters
(2007)
Yang, Huan-Jen
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Chen, Ke-Horng
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Lee, Yung-Pin
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交大名義發表
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National Chiao Tung University
A novel feed-forward pulse width modulation (FF-PWM) technique is proposed for improving line regulation of buck or boost (BOB) converters. In order to provide a regulated supply voltage for portable devices, DC-DC converters should have a good line regulation whenever the voltage of the battery is higher or lower than the system supply voltage. Because of the consideration of cost and footprint area issues, we provide a novel BOB converter with FF-PWM which can provide a regulated supply voltage without the use of transformers or voltage inversion. According to the value of input signals, BOB converters are also useful for dynamic voltage scaling systems or the radio frequency (RF) power amplifier (PA) because it can supply a dynamic voltage suitable for minimum power dissipation. Simulation results show the good line regulation of BOB converters due to the implementation of feed-forward pulse width modulation.
OPTIMAL DESIGN AND EXPERIMENTAL VALIDATION OF A NEW NO-CUFF BLOOD PRESSURE SENSOR BASED ON A NEW FINITE ELEMENT MODEL
(2014)
Tu, Tse-Yi
;
Chao, Paul C. -P.
;
Lee, Yung-Pin
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Kao, Yung-Hua
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電子工程學系及電子研究所
A new multi-physics finite element model (FEM) on the vibration of the radial artery on the wrist is built by this study to predict vibration of wrist artery vessel vibration and then diastolic and systolic blood pressures. The FEM includes the sensor of gel capsule and strain-sensing electrodes, skin, bones and muscles. The vibrations of skin surface and the sensor module are successfully simulated by the established FEM. The resulted vibratory deformation of the sensor electrodes are further transformed to resistance variations to mimic realistic electronics of the front-end readout circuit via establishing a cross-discipline sub-FEM model. The established FEM can is particularly customized to varied ages, weights, heights, genders, and special cardiovascular diseases of users. The customization can be performed in a fashion of one-time calibration by medical staff and/or medical staff. With the customized FEM in high accuracy level, the diastolic and systolic pressures can be accurately predicted by the simulated output resistance variation. Based on simulation FEMs, the design of the pulse sensor is successfully optimized via the processes of Taguchi and numerical methods. The measurements are also conducted to a dozen of subjects. It shows that the designed novel blood pressure sensor is capable of sensing the blood pressure to require accuracy level of the error less than 10% as compared to commercial counterparts with a cumbersome cuff.
Optimizing a new cuffless blood pressure sensor via a solid-fluid-electric finite element model with consideration of varied mis-positionings
(2016-06)
Kao, Yung-Hua
;
Tu, Tse-Yi
;
Chao, Paul C. -P.
;
Lee, Yung-Pin
;
Wey, Chin-Long
The sizes of a newly-developed non-invasive, cuffless blood pressure sensor are successfully optimized for maximizing its output signal quality. The optimization is conducted via establishing a coupled solid-fluid-electric model and considering varied mis-positionings. The non-invasive, cuffless blood pressure sensor consists of a gel-capsule and a strain sensor in a number of parallel electrodes. Towards sensing blood pressure, the BP sensor is designed to sense the vibration of radial artery by converting the deformation of the sensor electrodes to electrical signals. In practical uses, it is inevitable that the sensor is not placed right on the location where maximum vibration of the artery occurs, thus undermining the signal quality of the sensor output signals for accurate BP estimates. This study is dedicated to optimize the sizes of sensor electrodes with a required level of robustness to be able to obtain quality signals with presence of reasonable mis-positionings. The optimization is made possible by first establishing a coupled fluid-mechanics-electric model to predict sensor output due to dynamic artery dilations, and then the sizes of sensor electrodes are successfully optimized for maximum sensor outputs with consideration of reasonable mis-positionings. The range of sensor mis-positions considered is between -5 and +5 mm to cover all possible users in different heights, weights, ages, genders, etc. The optimal electrode length of the sensor is found to be 7 mm, while the accuracy of the predicted pressure levels are within +/- 7 mmHg, which conforms to the required accuracy of +/- 8 mmHg by The Association for the Advancement of Medical Instrumentation (AAMI).
Optimizing a new cuffless blood pressure sensor via a solid-fluid-electric finite element model with consideration of varied mis-positionings
(2016-06-01)
Kao, Yung-Hua
;
Tu, Tse-Yi
;
Chao, Paul C. -P.
;
Lee, Yung-Pin
;
Wey, Chin-Long
The sizes of a newly-developed non-invasive, cuffless blood pressure sensor are successfully optimized for maximizing its output signal quality. The optimization is conducted via establishing a coupled solid-fluid-electric model and considering varied mis-positionings. The non-invasive, cuffless blood pressure sensor consists of a gel-capsule and a strain sensor in a number of parallel electrodes. Towards sensing blood pressure, the BP sensor is designed to sense the vibration of radial artery by converting the deformation of the sensor electrodes to electrical signals. In practical uses, it is inevitable that the sensor is not placed right on the location where maximum vibration of the artery occurs, thus undermining the signal quality of the sensor output signals for accurate BP estimates. This study is dedicated to optimize the sizes of sensor electrodes with a required level of robustness to be able to obtain quality signals with presence of reasonable mis-positionings. The optimization is made possible by first establishing a coupled fluid-mechanics-electric model to predict sensor output due to dynamic artery dilations, and then the sizes of sensor electrodes are successfully optimized for maximum sensor outputs with consideration of reasonable mis-positionings. The range of sensor mis-positions considered is between -5 and +5 mm to cover all possible users in different heights, weights, ages, genders, etc. The optimal electrode length of the sensor is found to be 7 mm, while the accuracy of the predicted pressure levels are within +/- 7 mmHg, which conforms to the required accuracy of +/- 8 mmHg by The Association for the Advancement of Medical Instrumentation (AAMI).