A new non-invasive cuff-less blood pressure sensor

Tu, Tse-Yi; Chao, Paul C.-P.; Lee, Yung-Pin

doi:10.1109/icsens.2013.6688343

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…Since Manuscript the whole system is cumbersome, recently, new methods have been under development for next-generation "cuffless" sensors, like radio-frequency (RF) detective methods, photoplethysmography (PPG) method, etc [1]- [5]. On the other hand, physical sensor hardware is also one of popular topics along with the aforementioned detection methods [6]. In this study, a novel non-invasive, non-pressurized method based PPG signals is developed to compute the blood pressures via the modified radial resonance theory [7]- [12] and a newlydeveloped blood pressure transport theory based on the digital images captured by a CMOS camera that can be incorporated into a smart phone.…”

Section: Introductionmentioning

confidence: 99%

A New Image Blood Pressure Sensor Based on PPG, RRT, BPTT, and Harmonic Balancing

et al. 2014

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A new blood pressure (BP) sensor, also named sphygmomanometer, is developed in this paper for estimating BPs accurately from fingertips. The hardware of the sensor is a low-cost optical CMOS imaging device for detecting photoplethysmography (PPG) signals at fingertips. Therefore, the sensor neither needs to contact human skin nor pressurize it for accurate BP predictions. To calculate BPs based on captured PPG signals, the modified radial resonance theory is applied to develop a new BP transport theory (BPTT), and then composes a computation algorithm for implementing BPTT in a typical smart phone with limited computation load required. The algorithm is successfully implemented in a typical smart phone with minimum computation load and equipped with an efficient calibration process. An experiment is conducted to evaluate the performance of the designed BP-sensing techniques. The resulted data clearly show that the difference between the systolic BPs (SBPs) sensed by the propose sensor and a validated cumbersome instrument is 1.37 mmHg, while for diastolic BPs (DBPs) is −1.40 mmHg. The afore-reported accuracy is well below those required by the Association for the Advancement of Medical Instrumentation, which are ±5 and 8 mmHg, respectively, for SBPs and DBPs.Index Terms-Photoplethysmography (PPG), blood pressure sensor, radial resonance theory, sphygmomanometer, blood pressure transport theory. 1530-437X

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Section: Introductionmentioning

confidence: 99%

A New Image Blood Pressure Sensor Based on PPG, RRT, BPTT, and Harmonic Balancing

et al. 2014

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“…As opposed to PPG sensors, T.-Y. Tu et al [8] proposed a simple, direct-contact blood pressure sensor, which is generally considered by medical doctors more capable of generating reliable, accurate signals than PPG. However, due to the small diameter of the radial artery, mis-positioning of cuff-less sensor has been considered.…”

Section: Introductionmentioning

confidence: 99%

Optimizing a new blood pressure sensor for maximum performance based on finite element model

Tu¹,

Kao²,

Chao

et al. 2014

IEEE SENSORS 2014 Proceedings

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A new non-invasive, cuff-less, low-cost blood pressure (BP) sensor capable of continuous detection is optimized by this study for maximum performance. This blood pressure sensor module encapsulates specially-designed electrodes as a strain sensor to be attached to a flexible plate. In operations, the strain sensor is held stable with top surface contacting tightly with the human skin while the bottom surface under a low pressure exerted by a pressurizing wrist belt. The electrodes and plate are expected to vibrate in a synchronized fashion with artery pulsations as vibrations transmitted to the sensor through the module to vary the net (average) strain of electrodes, thus also varying its resistance. Employing a readout circuit of Wheatstone bridge, an amplifier, a filter, and a digital signal processor, the artery pulsations could be successfully converted to temporal voltage variations for calculating blood pressures via known algorithms. However, due to the small diameter of the artery, around 3 mm, mis-positioning (MP) of the sensor electrode area relative to the artery beneath is inevitable, which may lower sensor sensitivity due to smaller average strains. To remedy the problem, efforts are paid to conduct finite element modeling (FEM) and simulations on the electrodes, sensor module and the wrist including bone, tissue and other bio-structures to predict sensor output variations with respect to varied mis-positionings. Based on the predictions, the sensor optimal length is successfully found as 5 mm, which maximizes average strain, the sensitivity of the sensor.978-1-4799-0162-3/14/$31.00 ©2014 IEEE

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“…Recently, some research work also mentioned that continuous monitoring of the pulses will help to prevent the varied cardiovascular diseases at the early stage as well as to alarm users when the pulse signals become singular so as to avoid the situations like stroke, myocardial infarction, and sudden death [2,7]. In prospect of the increase in demand, developing a low-cost, wearable pulse sensor that can offer real-time continuous monitoring, immunizes mechanical and electronic noises, as well as displays some basic diagnostic results is becoming one of the most popular research topics in this area [5,6].…”

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confidence: 99%

Bioinspired non-invasive radial pulse sensor: from biomimetic design, system calibration, to clinic application

et al. 2014

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The research work aims at developing a real-time non-invasive metabolism and blood circulation surveillance system for monitoring human's health condition by sensing the various bio-signals on the human body. Our goal is to use the developed system to study the functions and characters of organs and tissues that highly relate with the metabolism and blood circulation system, and also, it is expected to help modeling the entire circulation system. At phase I of the research, in this paper we focus on developing a new low-cost, portable, high-accuracy, non-invasive radial pulse sensor. Inspired by touch capability and related biomechanical advantage of human fingertip, the mechanical design of the sensor mimics the physiological structure of human fingertip. The biomimetic sensor is then well calibrated using a high-accuracy force sensor, and the model is accurately identified by the system identification method. Further the calibrated sensor is applied to diagnose the arterial stiffness by measuring the augmentation index (AI) which is the important biomarker of vascular aging. Preliminary results demonstrate the sensor performance that it is capable of non-invasively, accurately, and reliably measuring radial pulse signals at real time, as well as to quantitatively determine the vessel aging.

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A new non-invasive cuff-less blood pressure sensor

Cited by 8 publications

References 12 publications

A New Image Blood Pressure Sensor Based on PPG, RRT, BPTT, and Harmonic Balancing

A New Image Blood Pressure Sensor Based on PPG, RRT, BPTT, and Harmonic Balancing

Optimizing a new blood pressure sensor for maximum performance based on finite element model

Bioinspired non-invasive radial pulse sensor: from biomimetic design, system calibration, to clinic application

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