一种极低功耗无线眼内压监测系统

本文描述了一种用于感知和传输青光眼患者眼内的极低功耗无线眼内压监测系统,该系统有电容型压力传感器、专用集成电路和偶极子天线构成。系统由电磁波供能,其在电源电压为1.24 V且正常监测时,功耗为7.56 μW,其射频输入灵敏度为-13 dBm。本文通过对无线输出数据进行编码以减小ASK调制时的失配时间大大减小了系统的射频输入灵敏度。系统的压力测量平均误差为 /-1.5 mmHg。最后对完整系统进行生物体测试,并成功得到眼压信号。     

Intraocular pressure (IOP) measurements in keratoconic patients: Do variations in IOP respect variations in corneal thickness and corneal curvature?

PurposeTo explore the relationship between intraocular pressure (IOP) measurements and topographical variations in corneal curvature and corneal thickness in a cohort of keratoconic patients presenting to a newly-established regional Keratoconic diagnostic and monitoring clinic in Northern Ireland.MethodsIOP was recorded, using a hand held ICARE tonometer, at central, nasal and temporal locations on keratoconic corneae of 27 consecutive patients attending clinic. Pachymetry and sagittal keratometry were recorded in matched locations using the Pentacam Topographer. Eyes with history of corneal surgery or anterior surface pathology were excluded.ResultsThe median (interquartile range) central keratometry, pachymetry (CCT) and IOP measurements for 49 eyes were 44.1D (42.2D–48.1D); 495 μm (460 μm–526 μm); 10 mmHg (8 mmHg–13 mmHg) respectively. Temporal and nasal keratometry, pachymetry, and IOP values, recorded on midline, were temporal 41.9D (40.7D–42.8D); 621 μm (579 μm–650 μm); 14 mmHg (11 mmHg–16 mmHg); nasal 40.8D (39.5D–42.5D); 641 μm (599 μm–698 μm); 13 mmHg (12 mmHg–17 mmHg). A moderate correlation was shown between reduction in CCT and increase in mean central keratometry (Spearman’s Coefficient (ρ) −0.72 P = 0.00). A moderate correlation was found between reduction in CCT and reduction in IOP, as recorded centrally (ρ = 0.37 P = 0.01). Mid-peripheral values demonstrated similar trends in the relationship between keratometry and IOP (nasal ρ = −0.47 P = 0.00; temporal ρ = −0.38 P = 0.00) and pachymetry and IOP (nasal ρ = 0.29 P = 0.05; temporal ρ = 0.33 p = 0.02).ConclusionIn this pilot study, a positive correlation exists between pachymetry, keratometry and IOP. Topographically variations in intraocular pressure mimic changes in keratometry and pachymetry.     

IOP480 TS流播出录制卡的开发

在数字电视中，经常需要流媒体播出。以PLX公司PLX IOP480PCI芯版为核心，外加CPLD、SRAM／SFIFO、SDRAM、DSP、PLL等器件，可构成一种新型播出录制卡，这种播出卡在软件系统控制下，可实现SPIS流板上再复用播出、MPTS播出、动态数据插入、输出码率可调，实时TS流的录制等功能。     

串行通信在加氢裂化装置3300系统升级改造中的应用

介绍Honeywell公司的TPS集散控制系统与Bently公司的3500监视系统的串口通信方案的实现,及其在辽阳石化公司炼油厂加氢裂化装置中的应用。     

MEMS镜片式眼压传感器设计

眼压(IOP)24 h的波动参数是眼科的一个重要的基础指标,目前传统的单个时间点的眼压测量无法有效地实现眼压的持续检测.基于眼压大小与眼角膜曲率的相关性,结合微机电系统(MEMS)微加工工艺和压模工艺,设计了一种基于电感的镜片式眼压传感器,在体外猪眼的实验结果证明了此传感器在眼压一定范围内(12~27 mmHg)可以准确地反映眼压波动情况.