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Flexible polydimethylsiloxane pressure sensor with micro-pyramid structures and embedded silver nanowires:A novel application in urinary flow measurement
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作者 Ben-Song Wang Ang Gao +4 位作者 Song-Wei Huang Qi-Hong Ning Cheng Zhou Qi-Xiang Song Da-XiangCui 《Nanotechnology and Precision Engineering》 EI CAS CSCD 2024年第3期1-12,共12页
Flexible pressure sensors are lightweight and highly sensitive,making them suitable for use in small portable devices to achieve precise measurements of tiny forces.This article introduces a low-cost and easy-fabricat... Flexible pressure sensors are lightweight and highly sensitive,making them suitable for use in small portable devices to achieve precise measurements of tiny forces.This article introduces a low-cost and easy-fabrication strategy for piezoresistive flexible pressure sensors.By embedding silver nanowires into a polydimethylsiloxane layer with micro-pyramids on its surface,a flexible pressure sensor is created that can detect low pressure (17.3 Pa) with fast response (<20 ms) and high sensitivity (69.6 mA kPa-1).Furthermore,the pressure sensor exhibits a sensitive and stable response to a small amount of water flowing on its surface.On this basis,the flexible pressure sensor is innovatively combined with a micro-rotor to fabricate a novel urinary flow-rate meter (uroflowmeter),and results from a simulated human urination experiment show that the uroflowmeter accurately captured all the essential shape characteristics that were present in the pump-simulated urination curves.Looking ahead,this research provides a new reference for using flexible pressure sensors in urinary flow-rate monitoring. 展开更多
关键词 Flexible pressure sensor Silver nanowires Portable device Uroflowmeter Healthcare
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Intraocular pressure before and after capsulorhexis using two viscoelastic substances and two surgical approaches in enucleated porcine eyes
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作者 Chiraz Ben Abdallah Walter Sekundo +1 位作者 Markus SLadewig Daniel M.Handzel 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2024年第6期1156-1160,共5页
AIM:To investigate the influence of ophthalmic viscoelastic devices(OVDs)and different surgical approaches on the intraocular pressure(IOP)before and after creation of the curvilinear circular capsulorhexis(CCC)as a m... AIM:To investigate the influence of ophthalmic viscoelastic devices(OVDs)and different surgical approaches on the intraocular pressure(IOP)before and after creation of the curvilinear circular capsulorhexis(CCC)as a measure for anterior chamber stability during this maneuver.METHODS:Prospective experimental WetLab study carried out on enucleated porcine eyes.IOP was measured before and after CCC with the iCare Rebound tonometer(iCare ic200;iCare Finland Oy,Vantaa,Finland).The OVDs used were a cohesive one[Z-Hyalin,Carl Zeiss Meditec AG,Germany;hyaluronic acid(HA)]and a dispersive[Z-Celcoat,Carl Zeiss Meditec AG,Germany;hydroxy propylmethylcellulosis(HPMC)].The CCC was created using Utrata forceps or 23 g microforceps in different combinations with the OVDs.RESULTS:Using the Utrata forceps the IOP dropped from 63.65±6.44 to 11.25±3.63 mm Hg during the CCC.The use of different OVDs made no difference.Using the 23 g microforceps the IOP dropped from 65.35±8.15 to 36.55±6.09 mm Hg.The difference between IOP drop using either Utrata forceps or 23 g microforceps was highly significant regardless of the OVD used.CONCLUSION:Using the sideport for the creation of the capsulorhexis leads to a lesser drop in IOP during this maneuver compared to the main incision in enucleated porcine eyes.The use of different OVD has no significant influence on IOP drop. 展开更多
关键词 cataract surgery ophthalmosurgical viscoelastic device intraocular pressure CAPSULORHEXIS enucleated porcine eye
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Pressure control method and device innovative design for deep oil in-situ exploration and coring
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作者 Nian-Han Wu Ming-Zhong Gao +5 位作者 Liang-Yu Zhu Jia-Nan Li Dong Fan Bin You Wei Luo Guo-Dong Zhu 《Petroleum Science》 SCIE EI CAS CSCD 2023年第2期1169-1182,共14页
Deep oil exploration coring technology cannot accurately maintain the in-situ pressure and temperature of samples, which leads to a distortion of deep oil and gas resource reserve evaluations based on conventional cor... Deep oil exploration coring technology cannot accurately maintain the in-situ pressure and temperature of samples, which leads to a distortion of deep oil and gas resource reserve evaluations based on conventional cores and cannot guide the development of deep oil and gas resources on Earth. The fundamental reason is the lack of temperature and pressure control in in-situ coring environments. In this paper, a pressure control method of a coring device is studied. The theory and method of deep intelligent temperature-pressure coupling control are innovatively proposed, and a multifield coupling dynamic sealing model is established. The optimal cardinality three term PID (Proportional-Integral-Differential) intelligent control algorithm of pressure system is developed. The temperature-pressure characteristic of the gas-liquid two-phase cavity is analyzed, and the pressure intelligent control is carried out based on three term PID control algorithms. An in-situ condition-preserved coring (ICP-Coring) device is developed, and an intelligent control system for the temperature and pressure of the coring device is designed and verified by experiments. The results show that the temperature-pressure coupling control system can effectively realize stable sealing under temperature-pressure fields of 140 MPa and 150 °C. The temperature-pressure coupling control method can accurately realize a constant pressure inside the coring device. The maximum working pressure is 140 MPa, and the effective pressure compensation range is 20 MPa. The numerical simulation experiment of pressure system control algorithm is carried out, and the optimal cardinality and three term coefficients are obtained. The pressure steady-state error is less than 0.01%. The method of temperature-pressure coupling control has guiding significance for coring device research, and is also the basis for temperature-pressure decoupling control in ICP-Coring. 展开更多
关键词 Deep oil exploration Fidelity coring device Temperature-pressure coupling control theory pressure control algorithm Temperature-pressure field alternating model
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Modern Monitoring Intraocular Pressure Sensing Devices Based on Application Specific Integrated Circuits
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作者 Daniel Piso Patricia Veiga-Crespo Elena Vecino 《Journal of Biomaterials and Nanobiotechnology》 2012年第2期301-309,共9页
Glaucoma is a neurodegenerative condition that is the leading cause of irreversible blindness worldwide. Elevated intraocular pressure (IOP) is the main risk factor for the development and progression of the disease. ... Glaucoma is a neurodegenerative condition that is the leading cause of irreversible blindness worldwide. Elevated intraocular pressure (IOP) is the main risk factor for the development and progression of the disease. Methods to lower IOP remain the first line treatments for the condition. Current methods of IOP measurement do not permit temporary noninvasive monitoring 24-hour IOP on a periodic basis. Ongoing research will in time provide a means of developing a device that will enable continuous or temporary monitoring of IOP. At present a device suitable for clinical use is not yet available.This review contains a description of different devices currently in development for measuring IOP: soft contact lens, LC resonant circuits and on-chip sensing devices. All of them use application-specific integrated circuits (ASICS) to process the measured signals and send them to recording devices. Soft contact lens devices are based on an embedded strain gauge, LC circuits vary their resonance frequency depending on the intraocular pressure (IOP) and, finally, on-chip sensing devices include an integrated microelectromechanical sensor (MEMS). MEMS are capacitors whose capacity varies with IOP. These devices allow for an accurate IOP measurement (up to +/– 0.2 mm Hg) with high sampling rates (up to 1 sample/min) and storing 1 week of raw data. All of them operate in an autonomous way and even some of them are energetically independent. 展开更多
关键词 GLAUCOMA INTRAOCULAR pressure MONITORING IMPLANTABLE device Application-Specific Integrated CIRCUIT
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Intraocular pressure control of a novel glaucoma drainage device-in vitro and in vivo studies 被引量:2
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作者 Li-Jun Cui Di-Chen Li +2 位作者 Jian Liu Lei Zhang Yao Xing 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2017年第9期1354-1360,共7页
AIM:To evaluate the intraocular pressure(IOP)control of an artificial trabeculum drainage system(ATDS),a newly designed glaucoma drainage device,and postoperative complications in normal rabbit eyes.METHODS:Pres... AIM:To evaluate the intraocular pressure(IOP)control of an artificial trabeculum drainage system(ATDS),a newly designed glaucoma drainage device,and postoperative complications in normal rabbit eyes.METHODS:Pressure drops in air and fluid of 30 ATDS were measured after being connected to a closed manometric system.Twenty of them were then chosen and implanted randomly into the eyes of 20 rabbits.Postoperative slitlamp,gonioscopic examination and IOP measurements were recorded periodically.Ultrasound biomicroscopy and B-scan ultrasonography were also used to observe the complications.Eyes were enucleated on day 60.RESULTS:Pressure drops of 4.6-9.4 mm Hg were obtained at physiological aqueous flow rates in the tests in vitro.The average postoperative IOP of the experimental eyes(11.6-12.8 mm Hg)was lower than the controls significantly(P〈0.05)at each time point.Complications of hemorrhage(n=1),cellulosic exudation(two cases)and local iris congestion(two cases)were observed.The lumina of the devices were devoid of obstructions in all specimens examined and a thin fibrous capsule was found around the endplate.CONCLUSION:ATDS reduce IOP effectively.However,further studies on the structure are needed to reduce complications. 展开更多
关键词 drainage device aqueous humor OUTFLOW intraocular pressure RABBIT
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The effects of a new shape-memory alloy interspinous process device on the distribution of intervertebral disc pressures in vitro 被引量:2
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作者 Shengnai Zheng Qingqiang Yao +5 位作者 Li Cheng Yan Xu Peng Yuan Dongsheng Zhang Xiangwen Liao Liming Wang 《The Journal of Biomedical Research》 CAS 2010年第2期115-123,共9页
This study was designed to measure the pressure distribution of the intervertebral disc under different degrees of distraction of the interspinous process, because of a suspicion that the degree of distraction of the ... This study was designed to measure the pressure distribution of the intervertebral disc under different degrees of distraction of the interspinous process, because of a suspicion that the degree of distraction of the spinous process may have a close relationship with the disc load share. Six human cadaver lumbar spine L2-L5 segments were loaded in flexion, neutral position, and extension. The L3-L4 disc load was measured at each position using pressure measuring films. Shape-memory interspinous process implants (SMID) with different spacer heights, ranging in size from 10 to 20 mm at 2 mm increments, were used. It was found that a SMID with a spacer height equal to the distance of the interspinous process in the neutral position can share the biomechanical disc load without a significant change of load in the anterior annulus. An interspinous process stabilizing device (IPD) would not be appropriate to use in those cases with serious spinal stenosis because the over-distraction of the interspinous process by the SMID would lead to overloading the anterior annulus which is a recognized cause of disc degeneration. 展开更多
关键词 Lumbar spine disc pressure interspinous process device BIOMECHANICS
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Flexible and electrically robust graphene-based nanocomposite paper with hierarchical microstructures for multifunctional wearable devices
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作者 Zhen-Hua Tang Wei-Bin Zhu +4 位作者 Jun-Zhang Chen Yuan-Qing Li Pei Huang Kin Liao Shao-Yun Fu 《Nano Materials Science》 EI CAS CSCD 2023年第3期319-328,共10页
Multifunctional and flexible wearable devices play a crucial role in a wide range of applications,such as heath monitoring,intelligent skins,and human-machine interactions.Developing flexible and conductive materials ... Multifunctional and flexible wearable devices play a crucial role in a wide range of applications,such as heath monitoring,intelligent skins,and human-machine interactions.Developing flexible and conductive materials for multifunctional wearable devices with low-cost and high efficiency methods are highly desirable.Here,a conductive graphene/microsphere/bamboo fiber(GMB)nanocomposite paper with hierarchical surface microstructures is successfully fabricated through a simple vacuum-assisted filtration followed by thermo-foaming process.The as-prepared microstructured GMB nanocomposite paper exhibits not only a high volume electrical conductivity of~45 S/m but also an excellent electrical stability(i.e.,relative changes in resistance are less than 3%under stretching,folding,and compressing loadings)due to its unique structure features.With this microstructured nanocomposite paper as active sensing layer,microstructured pressure sensors with a high sensitivity(-4 kPa^(-1)),a wide sensing range(0–5 kPa),and a rapid response time(about 140 ms)are realized.In addition,benefitting from the outstanding electrical stability and mechanical flexibility,the microstructured nanocomposite paper is further demonstrated as a low-voltage Joule heating device.The surface temperature of the microstructured nanocomposite paper rapidly reaches over 80℃ when applying a relatively low voltage of 7 V,indicating its potential in human thermotherapy and thermal management. 展开更多
关键词 GRAPHENE Bamboo fibers MICROSPHERES pressure sensors Joule heating devices
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A wireless-communication-based measurement of gas pressure with capsule-slime sealing device
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作者 Zhengyan Wu Deqiang Fan +4 位作者 Shuguang Jiang Hao Shao Kai Wang Weiqing Zhang Chaowei Guo 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2019年第6期917-923,共7页
To solve the existing problems of imperfect sealing and the inaccurate measurement of gas pressure in traditional sealing,the present study builds a new model of capsule-slime sealing device based on wireless pressure... To solve the existing problems of imperfect sealing and the inaccurate measurement of gas pressure in traditional sealing,the present study builds a new model of capsule-slime sealing device based on wireless pressure gauge.The new sealing device is mainly composed of two sets of capsules,a capsule connecting piece and a slime part,measures the pressure through the wireless communication technology,and seals through chemical reaction in the capsule,which generates gas to expand the capsule and extrude the pre-stored slime.Two methods of extruding pre-stored slime are proposed:in the first method,transverse force is generated by the expansion of the capsules at both ends,pushing the capsules toward the middle through the chute and squeezing the pre-stored slime out;in the second,high-pressure gas generated in the capsules is led into the expansion tube,which is inserted into the storage tube,squeezing it and letting the slime out to complete the sealing process.Then the research studies the effect of sealing under the condition of drilling with the structure of slime storage tube.The results indicate that the maximum standing time of slime wrapped in metal net is 2 h,instead of the expected 10 d,failing to meet the sealing requirements.When the slime viscosity is 1200–3000 m Paás in the structure of slime storage tube,the best viscosity of slime is achieved and can simulate sealing the drilling hole(5–4,4–2.36,2.36–1.18,1.18–0.15 mm in diameter),as well as the gap caused by mixed sand accumulation. 展开更多
关键词 WIRELESS pressure GAUGE Capsule-slime HOLE SEALING device Simulated SEALING
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Design of New Elevator Pressure Guide Plate and Its Test Device
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作者 Qihang Xu Shaoke Chen 《Mechanical Engineering Science》 2019年第1期7-13,共7页
Pressure guide plate plays a certain role in the safe operation of elevator.Based on understanding the respective performance of new and old pressure guide plates,this paper analyses the problems existing in the origi... Pressure guide plate plays a certain role in the safe operation of elevator.Based on understanding the respective performance of new and old pressure guide plates,this paper analyses the problems existing in the original pressure guide plate.It also conducts stress analysis according to the function of pressure guide plate on elevator,and designs a new type of pressure guide plate combined with technological capability and equipment.According to the stress characteristics,a test device is designed and a comparative test is made between the new type of pressure guide plate and the old in order to test the reliability of the new type of pressure guide plate.The test proves that the new pressure guide plate of elevator can meet the requirements of product use and safe operation of elevator products. 展开更多
关键词 pressure GUIDE PLATE Test devicE GUIDE RAILS ELEVATOR
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Study on Measuring Device for Bearing Clearance of Hemisphere Dynamic Pressure Motor
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作者 YAN Xiaojun YU Detao TANG Zhaofang 《Aerospace China》 2018年第1期3-8,共6页
The clearance of the hemisphere dynamic pressure motor is small and difficult to measure, the measurement method of micro clearance is studied. The shortcomings of the original measurement method are analyzed, and a c... The clearance of the hemisphere dynamic pressure motor is small and difficult to measure, the measurement method of micro clearance is studied. The shortcomings of the original measurement method are analyzed, and a clearance measuring device for the hemisphere dynamic pressure motor is designed, which improves the measurement efficiency and stability. 展开更多
关键词 hemisphere dynamic pressure motor measurement of micro clearance precision measurement research on device
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Parameter optimization and experiment of the negative pressure precision seed-metering device for wheat
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作者 Yubo Feng Xiaoshun Zhao +3 位作者 Jincai Li Huali Yu Hongpeng Zhao Baozhong Yin 《International Journal of Agricultural and Biological Engineering》 SCIE 2024年第1期154-162,共9页
In order to ensure the most reasonable distribution of wheat seeds in the field to improve seeding quality and uniformity,a set of negative pressure precision seed-metering device was designed,which shares a hollow sh... In order to ensure the most reasonable distribution of wheat seeds in the field to improve seeding quality and uniformity,a set of negative pressure precision seed-metering device was designed,which shares a hollow shaft.Every seed-metering device can sow two rows of wheat.By the STAR-CCM+,the analysis of nephogram,vectogram and streamline graph showed that more ideal structural parameters of the seed-metering device are 0.5 mm width of the slit sucking seed(WSS),150-200 mm diameter of the seed-metering disc(DSD),2.0 mm axial depth of air chamber in the seed-metering disc(ADS),and arc-shaped cross-section shape of the ring groove sucking seed(CSGS).Single-factor test on the JPS-12 test-bed analyzed the influence of the CSGS,WSS,DSD,and ADS on the qualified index(Iq),multiple index(Imul),miss index(Imiss)and coefficient of variation of qualified seed spacing(CV).Through the orthogonal on the JPS-12 test-bed,it is found that the influence of vacuum negative pressure and seed-metering device shaft speed is significant on the Iq,Imiss and Imul.Based on these,the structural parameters of the seed-metering device were optimized.The DSD is 180 mm,the WSS is 0.7 mm,the ADS is 2.5 mm,and the CSGS is arc-shaped.The optimization seed-metering device was tested on the JPS-12 test-bed.The Iq is 86.66%,the Imiss is 5.09%,the Imul is 8.25%,and the CV is 24.50%.These testing results fully coincide with the standard JB/T 10293-2013 Specifications of single seed drill(precision drill).The seed-metering device meets fully the requirements for wheat precision seeding. 展开更多
关键词 WHEAT seed-metering device negative pressure PRECISION parameter optimization STAR-CCM+ orthogonal test variance analysis
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Influence of confi ning pressure and impact loading on mechanical properties of amphibolite and sericite-quartz schist 被引量:4
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作者 Liu Shi Xu Jinyu Lv Xiaocong 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2014年第2期215-222,共8页
In order to investigate the dynamic mechanical properties of amphibolite and sericite-quartz schist under confi ning pressure, two rocks are subjected to impact loadings with different strain rates and confi ning pres... In order to investigate the dynamic mechanical properties of amphibolite and sericite-quartz schist under confi ning pressure, two rocks are subjected to impact loadings with different strain rates and confi ning pressures by using split Hopkinson pressure bar equipment with a confi ning pressure device. Based on the experimental results, the stress-strain curves are analyzed and the effects of confi ning pressure and strain rates on the dynamic compressive strength, peak strain and failure mode are summarized. The results show that:(1) The characteristics of two rocks in the ascent stage of the stressstrain curve are basically the same, but in the descent stage, the rocks gradually show plastic deformation characteristics as the confi ning pressure increases.(2) The dynamic compressive strength and peak strain of two rocks increase as the strain rate increases and the confi ning pressure effects are obvious.(3) Due to the effect of confi ning pressure, the normal stress on the damage surface of the rock increases correspondingly, the bearing capacity of the crack friction exceeds the material cohesion and the slippage of the fractured rock is controlled, which all lead to the compression and shear failure mode of rock. The theoretical analysis and experimental methods to study the dynamic failure mode and other related characteristics of rock are useful in developing standards for engineering practice. 展开更多
关键词 rock mechanics SHPB with confi ning pressure device confi ning pressure strain rate impact loading
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Autologous mesenchymal stem cells applied on the pressure ulcers had produced a surprising outcome in a severe case of neuromyelitis optica 被引量:1
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作者 Adriana Octaviana Dulamea Mirela-Patricia Sirbu-Boeti +4 位作者 Coralia Bleotu Denisa Dragu Lucia Moldovan Ioana Lupescu Giancarlo Comi 《Neural Regeneration Research》 SCIE CAS CSCD 2015年第11期1841-1845,共5页
Recent studies provided evidence that mesenchymal stem cells(MSCs) have regenerative potential in cutaneous repair and profound immunomodulatory properties making them a candidate for therapy of neuroimmunologic dis... Recent studies provided evidence that mesenchymal stem cells(MSCs) have regenerative potential in cutaneous repair and profound immunomodulatory properties making them a candidate for therapy of neuroimmunologic diseases. Neuromyelitis optica(NMO) is an autoimmune, demyelinating central nervous system disorder characterized by a longitudinally extensive spinal cord lesion. A 46-year-old male diagnosed with NMO had relapses with paraplegia despite treatment and developed two stage IV pressure ulcers(PUs) on his legs. The patient consented for local application of autologous MSCs on PUs. MSCs isolated from the patient's bone marrow aspirate were multiplied in vitro during three passages and embedded in a tridimensional collagen-rich matrix which was applied on the PUs. Eight days after MSCs application the patient showed a progressive healing of PUs and improvement of disability. Two months later the patient was able to walk 20 m with bilateral assistance and one year later he started to walk without assistance. For 76 months the patient had no relapse and no adverse event was reported. The original method of local application of autologous BM-MSCs contributed to healing of PUs. For 6 years the patient was free of relapses and showed an improvement of disability. The association of cutaneous repair, sustained remission of NMO and improvement of disability might be explained by a promotion/optimization of recovery mechanisms in the central nervous system even if alternative hypothesis should be considered. Further studies are needed to assess the safety and efficacy of mesenchymal stem cells in NMO treatment. 展开更多
关键词 neuromyelitis optica devic's syndrome mesenchymal stem cells multiple sclerosis pressure ulcers
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The properties of Sn-Zn-Al-La fusible alloy for mitigation devices of solid propellant rocket motors 被引量:2
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作者 Zi-ting Wei Nan Li +5 位作者 Jian-xin Nie Jia-hao Liang Xue-yong Guo Shi Yan Tao Zhang Qing-jie Jiao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2022年第9期1688-1696,共9页
The Al and La elements are added to the Sn9Zn alloy to obtain the fusible alloy for the mitigation devices of solid propellant rocket motors. Differential scanning calorimetry(DSC), metallographic analysis,scanning el... The Al and La elements are added to the Sn9Zn alloy to obtain the fusible alloy for the mitigation devices of solid propellant rocket motors. Differential scanning calorimetry(DSC), metallographic analysis,scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), tensile testing and fracture analysis were used to study the effect of Al and La elements on the microstructure, melting characteristics, and mechanical properties of the Sn9Zn alloy. Whether the fusible diaphragm can effectively relieve pressure was investigated by the hydrostatic pressure at high-temperature test. Experimental results show that the melting point of the Sn9Zn-0.8Al0·2La and Sn9Zn-3Al0·2La fusible alloys can meet the predetermined working temperature of ventilation. The mechanical properties of those are more than 35% higher than that of the Sn9Zn alloy at-50°C-70°C, and the mechanical strength is reduced by 80% at 175°C. It is proven by the hydrostatic pressure at high-temperature test that the fusible diaphragm can relieve pressure effectively and can be used for the design of the mitigation devices of solid propellant rocket motors. 展开更多
关键词 Mitigation devices Solid propellant rocket motors Sn9Zn Al element La element Hydrostatic pressure at high-temperature test
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Ambulatory pulmonary artery pressure monitoring in advanced heart failure patients 被引量:1
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作者 Srikanth Yandrapalli Anoshia Raza +1 位作者 Sohaib Tariq Wilbert S Aronow 《World Journal of Cardiology》 CAS 2017年第1期21-26,共6页
Heart failure (HF) is an emerging epidemic associate with significant morbidity, mortality, and health care expenditure. Although there were major advances in pharmacologic and device based therapies for the managemen... Heart failure (HF) is an emerging epidemic associate with significant morbidity, mortality, and health care expenditure. Although there were major advances in pharmacologic and device based therapies for the management of HF, mortality of this condition remains high. Accurate monitoring of HF patients for exacerbations is very important to reduce recurrent hospitalizations and its associated complications. With the failure of clinical signs, tele-monitoring, and laboratory bio-markers to function as early markers of HF exacerbations, more sophisticated techniques were sought to accurately predict the circulatory status in HF patients in order to execute timely pharmacological intervention to reduce frequent hospitalizations. CardioMEMS<sup>TM</sup> (St. Jude Medical, Inc., Saint Paul, Minnesota) is an implantable, wireless pulmonary arterial pressure (PAP) monitoring system which transmits the patient’s continuous PAPs to the treating health care provider in the ambulatory setting. PAP-guided medical therapy modification has been shown to significantly reduce HF-related hospitalization and overall mortality. In advanced stages of HF, wireless access to hemodynamic information correlated with earlier left ventricular assist device implantation and shorter time to heart transplantation. 展开更多
关键词 CardioMEMS Heart failure Remote heart failure monitoring Pulmonary arterial pressure monitoring Left ventricular assist device
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Development of a 100 MPa water–gas two-phase fluid pressurization device
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作者 Shengbin Li Heping Li +1 位作者 Lin Chen Hongbin Zhou 《Acta Geochimica》 EI CAS CSCD 2021年第1期25-31,共7页
This paper introduces a 100 MPa water gas twophase fluid pressurization device.The device can provide 100 MPa gas pressure and 200 MPa liquid pressure for small volume(<20 mL)high-pressure experimental devices.This... This paper introduces a 100 MPa water gas twophase fluid pressurization device.The device can provide 100 MPa gas pressure and 200 MPa liquid pressure for small volume(<20 mL)high-pressure experimental devices.This device can make the pressure control independent of the temperature control without changing the material components of the system.The resolution of this device in adjusting the pressure is±0.2 MPa in the process of boosting and depressurizing.This pressure boosting device generates very little vibration during work and it can be used in experiments with strict requirements on vibration.As a thermodynamic parameter,pressure has a great influence on matter.In the field of experimental geochemistry,pressure is not only an experimental method and an extreme condition but an important physical parameter independent of temperature and chemical composition. 展开更多
关键词 High-precision pressurization device High pressure fluid Gas pressurization Liquid pressurization
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Pressure Ulcer Prevention: Effectiveness of Heel Off-Loading Methodologies
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作者 Christopher C. Griffin Tammy Dean +1 位作者 Jonathan M. Cayce Mary Anne Modrcin 《Open Journal of Nursing》 2015年第10期909-916,共8页
Skin integrity breakdown and pressure ulcer formation on the heel are predictable and preventable healthcare occurrences. By minimizing surface contact pressures that can cause heel capillary occlusion, heel off-loadi... Skin integrity breakdown and pressure ulcer formation on the heel are predictable and preventable healthcare occurrences. By minimizing surface contact pressures that can cause heel capillary occlusion, heel off-loading devices help mitigate the risk of decubitus ulceration. The purpose of this study is to investigate the efficacy of six off-loading methods commonly used in clinical settings to decrease heel contact pressure. Pressure mapping is used to evaluate contact pressure at the heel for underweight, normal weight, and overweight simulations. Based upon averages across four trials, it is shown that all devices reduce heel contact pressure when compared to no off-load- ing. The PRUventor&#8482 boot exhibits significantly lower average pressure values than other off-load- ing strategies tested, suggesting that the PRUventor&#8482 is the most effective off-loading device. From the analysis of the experimental data and comparison to similar data for respective off-loading alternatives, it is concluded that the PRUventor&#8482 boot is an effective heel off-loading device for use in clinical settings. 展开更多
关键词 HEEL pressure ULCER pressure ULCER OFF-LOADING devices Pruventor™ pressure Mapping
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Analysis and verification of gas content and pressure change rate characteristics in hydraulic system
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作者 Han Heyong Liu Yuan +2 位作者 Qin Lixia Wang Kai Peng Huayu 《High Technology Letters》 EI CAS 2019年第3期326-333,共8页
Gas content of the hydraulic system directly affects the rate of pressure change of the hydraulic system. The purpose of this paper is to establish a mathematical model of oil gas content, hydraulic system pressure an... Gas content of the hydraulic system directly affects the rate of pressure change of the hydraulic system. The purpose of this paper is to establish a mathematical model of oil gas content, hydraulic system pressure and pressure rise rate, obtain corresponding oil pressure value when the pressure rise rate of different gas content is maximum, and verify the accuracy of this conclusion by the FLUENT simulation software. On this basis, a rapid pressure building device of the hydraulic system is developed and designed. The above oil pressure value is used as the working cut-off pressure of the rapid pressure building device, and then the hydraulic oil pump continues to pressurize to the highest working pressure required by the system. The research content can replace the hydraulic system from the initial low pressure to the rapid pressure build-up of the oil, thus increasing the construction pressure of the hydraulic system. The research results show that the rapid pressure building device effectively reduces the time for the hydraulic system to establish pressure. Through the analysis of theoretical derivation and the collected experimental data, the error is about 5.9%, which verifies the correctness of the theoretical formula. 展开更多
关键词 hydraulic system gas content establishment of pressure rate rapid pressure building device pressure building time
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Improvised technique for measuring tracheal tube cuff pressure
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作者 René Agustín Flores-Franco 《World Journal of Anesthesiology》 2016年第1期36-37,共2页
We agree with the editorial published by Feng et al concerning the insufficient routine monitoring of tracheal tube cuff pressure(TTCP) by anesthesiologists, and propose an improvised technique that can facilitate and... We agree with the editorial published by Feng et al concerning the insufficient routine monitoring of tracheal tube cuff pressure(TTCP) by anesthesiologists, and propose an improvised technique that can facilitate and promote such routine monitoring by intensive care staff who attend to patients receiving mechanical ventilation. Insufficient monitoring of tracheal cuff pressure has also been documented for intensive care unit nurses. Measurements of cuff pressure are beneficial when used in management of air leakage around an endotracheal tube, and can be easily obtained with the aid of a personalized and simple technique performed using materials that are readily available in all hospitals. Other investigators have previously demonstrated the usefulness of employing an improvised technique. We considered that possible disadvantages are similar to those encountered when using standardized equipment. With our improvised technique, we seek to promote among the nursing staff the determination of the TTCP in intubated patients to reduce the risk of related medical complications. 展开更多
关键词 ENDOTRACHEAL TUBE Mechanical ventilation CUFF pressure Improvised devices NURSING PRACTICE
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Effects of Cold Atmospheric Pressure Plasma on Accelerating Acute Wound Healing: A Comparative Study among 4 Different Treatment Groups
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作者 Akio Nishijima Takahiro Fujimoto +1 位作者 Takamichi Hirata Junko Nishijima 《Modern Plastic Surgery》 2019年第1期18-31,共14页
Cold atmospheric pressure plasma (CAP) has been expected to be effective for wound healing among plasma medicines and has been attracting attention. The aim of this retrospective clinical study was to evaluate and com... Cold atmospheric pressure plasma (CAP) has been expected to be effective for wound healing among plasma medicines and has been attracting attention. The aim of this retrospective clinical study was to evaluate and compare the effects of CAP on acute wounds created by a fractional CO2 (FXCO2) laser on four treatment groups. Methods: This study was conducted between September 2017 and November 2018. Radiated surface wounds were created using a FXCO2 laser on four identically-sized regions on the medial side of the left forearm of 12 healthy volunteer subjects, for a total of 48 treatment regions. Each region was then randomly assigned to one of four groups: 1) no treatment (control group), 2) irradiated CAP for 60 seconds (plasma group), 3) topical application of ointment containing betamethasone valerate (steroid group), or 4) two to three sprays of basic fibroblast growth factor (bFGF group). The primary outcome of the skin was the change in absolute values of lightness index (L*), redness index (a*I) of L*a*b color space, arithmetical mean roughness (Ra), and mean melanin concentration. The secondary outcome was the clinical condition of the wounds, including inflammation, crust formation, and hyper/hypo-pigmentation on the recovering skin surface relative to the surrounding intact skin. Each item was evaluated at post-treatment 0, 1, 3, 7, 14, 28 days and 1 year. Results: Although no significant difference was observed among all groups, the CAP group exhibited more rapid recovery regarding a*I and Ra. No side-effects were observed in the CAP group. Conclusion: CAP is considered to accelerate healing of irradiated wounds via anti-inflammatory activity. Our study confirmed the effectiveness and safety of CAP which is devoid of side-effects of conventional therapies, and may aid in future development of medical plasma therapies. 展开更多
关键词 COLD Atmospheric pressure PLASMA PLASMA Medicine New Energy device WOUND HEALING SKIN Activation
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