心电遥测监护系统的研制

本文介绍了作者研制的心电遥测监护系统。它采用个人计算机和心电遥测盒，以无线的方式采集心电信号。具有波形与数值集中显示、存储、回放、打印、数据管理的功能。     

无线心电监测系统的设计

本文依据心电图机原理设计了一种新型的无线遥测心电监测系统。系统以低功耗单片机MSP430为核心,通过无线发射芯片NRF2401把采集的心电信号发射出去,并由接收端将心电信号传输给PC机以供进一步分析和处理。在实验室环境中测试,达到了设计效果。     

基于移动电话传输信号的心音遥测方法的初步研究

目的:探索心力和心率同时遥测的一种方法。方法:用一心音信号采集装置采集心力和心动周期信号,经一音频电缆传给一只移动电话机,再以无线方式传到另一只移动电话机,最后通过另一条音频电缆传输到计算机。结果:心音信号能通过移动电话机以无线方式传到另一只移动电话机再传到计算机;2只移动电话机之间的无线传输距离为5m,3km和2000km远。结论:心力和心率同时遥测可以通过移动电话机—移动电话机的模式来实现,这种方法具有无创、简便、快速、费用低、可重复采用等特点。     

基于C8051F020和PTR2000的无线心电监护系统的设计

介绍一种基于 C8051F020单片机和 PTR2000模块的心电采集和无线传输系统的设计.在单片机的控制下,对心电信号进行实时采集,采集到的心电数据以无线的方式传送到 PC机,由 PC进行处理和显示.该系统能对患者心电进行实时无线监护,允许患者在一定范围内自由活动.     

生理多参数无线监护系统的研制

本文介绍了一种生理多参数无线监护系统。系统分为病房监护端和医生监护端两部分,由生理多参数采集电路模块、无线射频电路模块和计算机组成,通过射频通讯实现生理数据的无线传输。实验检测结果表明,利用病房监护端可实现生理参数的床边实时监护;利用医生监护端可实现生理参数的无线遥测。该系统特别适用于高危传染病人生理多参数的实时监护。     

全程心电监护系统的设计与实现

全程心电监护系统在心胸外科、手术室和ICU联网的基础上,增加Unity服务器、心电会诊中心、遥测监护中心及无线心电监护中央站等系统结构,以病人入院后在各科室间流动为主线,实现工作流程标准化、临床数据电子化等流程和软硬件设计,实现了心电信息的全程实时采集、分析、存储、查询和举证.     

基于2.4G无线数据通信技术的无线心音传感器设计

目的:为实现心音信号的无线采集和传输,从外形上简化设备,减少对被测患者的干扰。方法:利用先进的2.4 G无线数据通信传输技术,将前端传感器所采集到的心音信号无线传输至分析端。结果:成功利用该设备传输传送心音信号,且性能良好。结论:采用2.4 G无线通信技术的无线心音传感器设计方法能够实现对于心音信号的无线采集和传输。     

多参数遥测监护系统的常见故障分析及排除

遥测监护是指在一定距离内,通过无线的方法对生物体的心电信号、血氧饱和度、无创血压等生理参数进行数据采集和监护,可及时了解患者病情,实时监护患者状况[1]。我院心内科所用的多参数遥测监护系统为无线电遥测,遥测方式是利用无线电作为载体传播信号,即先调制生理信号,然后由发射机以电磁波的方式将调制后的生理信号发射出去,通过接收机接收调制信号,再由解调电路恢复原有的生理信号。随着仪器使用年限的不断增加,其发生故障的频率也越来越高[2]。现主要就多参数遥测监护系统的通信原理及常见故障进行分析。     

无线遥测电子体温计的研制

介绍一种具有无线遥测功能的电子体温测量系统。该系统主要包括测温模块(电子体温计)、发射模块、接收模块、计算机终端。测温模块采用美国TI公司的MSP430作为采集和控制器;发射和接收模块均采用美国TI公司的无线收发芯片TRF6900,并以MSP430作为其控制器。接收模块通过RS232接口将温度数据传送至计算机进行显示。     

解决高压氧舱无线遥测监护仪的信号问题

本文介绍一款高压氧舱专用无线遥测仪器P＆D-9000 ECG anywhere数码动态遥测心电记录监护仪,在使用中出现信号偏弱时所采取的解决方法,及排除波形干扰的一个特例。     

同时采集多名运动员心力和心率的心音信号遥测系统的研制

介绍一种基于通用串行总线(USB)接口的多名运动员心音信号遥测系统.它通过对信号处理电路的巧妙设计和数据包传输格式的合理组织,能够实现心力(第一心音幅度)与心率信号的同时遥测;由于采用了高性能的多通道单片射频收发芯片一nRF903,使它能够同时监测10名运动员的心音信号;凭借专用的USB接口模块-USB100,遥测接收机可以通过USB端口与笔记本计算机实现高速数据通信而无需缓存和额外工作电源.该遥测系统为在运动现场监测和评估运动员的心力储备提供了一个可靠的技术平台.     

红外传输单道心电遥测系统设计

用红外光作为传输媒介的单道心电遥测系统,可对被度者进行实时监护,具有异常心电检测、报警、显示、存储、打印等功能,作用距离较远,是红外遥测技术应用于临床的一种有益的尝试和探索。     

多道生理信号的红外光遥测系统

介绍一种用于体温、呼吸和心电测量的多道红外光遥测系统,并给出实验结果。该多道遥测系统可应用在诸如电外科手术等强电磁干扰的环境下,作为患者监护的重要手段。     

运动员心音信号遥测系统的USB接口解决方案

一种用于单片机与PC机之间建立通用串行总线(USB)接口的快速解决方案。它凭借专用的USB接口模块—USB100,实现了运动员心音信号遥测系统与笔记本计算机之间的高速数据通信而无须缓存和额外工作电源,从而为在运动现场监测运动员的心力储备提供了一个可靠的技术平台。     

Totally implantable directional Doppler flowmeters.

Two totally implantable Doppler blood flowmeters have been developed for the chronic measurement of deep-body flows; made possibly by two custom-integrated circuits. The CW and pulsed Doppler instruments are small (less than 2.5 cm3), use little power (less than 30 mW), and have excellent baseline stability. The pulsed Doppler flowmeter is applied principally when velocity-profile information or a nonencircling transducer assembly is required but where minimal restraint of the animal for inductive telemetry is permissible. Using a circumferential cuff, the CW Doppler flowmeter monitors Doppler data over a at least a 3-meter range by means of RF telemetry and produces a single velocity estimate. These instruments compliment each other and other telemetry systems by proving the researcher with alternatives for the long-term measurement of deep-body flow without percutaneous leads.     

Refinement techniques in experimental protocols involving Callitrichids

The invasiveness of biomedical experiments on laboratory animals should be limited to the greatest extent possible yet without sacrificing the quality of the data collected. To this end, refinement techniques can be used. In the present work, we describe some of these techniques, focussing on the familiarity of the experimental environment, alternative sampling techniques (including the use of positive training), telemetry, and methods for improving ethological experiments. As a model, we have chosen the common marmoset (Callithrix jacchus), which is frequently used in biomedical research.     

Physiologic monitoring systems

Physiologic monitoring systems, which monitor vital physiologic parameters so that clinicians can be informed of changes in a patient's condition, typically consist of several distinct components, including a central station, bedside monitors, and ambulatory telemetry transmitters and receivers. For this study, rather than focusing on how each component performs individually, we evaluated how the entire system functions as a whole to better parallel the acquisition practices followed by most hospitals. We evaluated systems from eight suppliers, focusing primarily on adaptability, alarm implementation, and human factors design. We included only systems that offer (1) a central station that can concurrently receive information from bedside monitors and ambulatory telemetry transmitters, (2) one or more bedside monitors that can be used in critical care and intermediate care areas, as well as during transport, and (3) ambulatory telemetry monitoring. We rated the evaluated systems based on their capabilities for each of six applications: critical care unit, emergency department, intermediate care unit and general medical/surgical floor, operating room, postanesthesia care unit, and transport. We found that many of the systems are suitable for some applications, but are unable to meet the requirements for others.     

Ambulatory telemetry systems

Ambulatory telemetry systems allow patients to move around the hospital while certain physiologic parameters are monitored. Traditionally, telemetry systems have used compact transmitters worn by the patient to take readings and transmit them to a central station. More recently, to expand telemetry's capabilities without adding excessive size and weight to the patient-worn transmitters, some suppliers have provided certain parameters using small wireless portable bedside monitors that are wheeled around on a roll stand by the patient. In this Evaluation, we judge the capabilities of 18 telemetry systems--14 that are intended for general telemetry use, 2 that are designed specifically for use in cardiac rehabilitation programs, and 2 that are marketed for both applications. For the general systems, we looked for the ability to provide electrocardiogram, pulse oximetry, and noninvasive blood pressure measurements as needed without making the patient transmitter too big and heavy for practical use. Cardiac rehab systems generally need to provide only ECG readings, so our ratings focus principally on patient comfort and the appropriateness of the systems' capabilities for this application. We also revisit some of the issues surrounding telemetry transmission techniques: Whether it's better to operate in the new Wireless Medical Telemetry Service (WMTS) frequencies than in the Industrial, Scientific, and Medical (ISM) bands, and whether bidirectional transmissions provide better telemetry capabilities than unidirectional ones.     

Effects of interdisciplinary rounds on length of stay in a telemetry unit.

Interdisciplinary rounds (IRs) have been proposed to improve staff communication and reduce LOS. There have been no studies of IRs on an inpatient telemetry ward. Patients on a telemetry unit of a community hospital were randomly assigned to either an IR intervention or standard care. Charts were reviewed to determine LOS, patient characteristics, and indirect indices of quality of care. INTERVENTION: Daily work rounds, in which resident physicians, nurses, and ancillary staff meet to discuss patients on the team. RESULTS: 84 patients were enrolled, 42 randomized to the intervention and 42 to standard care. There was no significant difference in LOS. Indirect measures of quality of care (dietician, pharmacist, or physical therapist visit) did not differ. In a multiple linear regression model, only abnormal laboratory data, the presence of dementia, and the presence of a home health aid significantly predicted LOS. CONCLUSION: IRs did not decrease LOS in a telemetry ward. Whereas a potential benefit of IRs in other settings cannot be ruled out, this study emphasizes the importance of rigorous testing of strategies to enhance the quality or reduce the costs of inpatient care.     

Medical telemetry is on the move. Is it time for you to change frequencies?

Medical telemetry in the United States is in the midst of a transformation. The VHF and UHF transmission bands traditionally used for most medical telemetry have become increasingly crowded. In response, the U.S. Federal Communications Commission (FCC) is making new frequency bands available exclusively for medical telemetry. Many users of the traditional bands will need to migrate out of them--but how soon will this become necessary? And what's involved in making the switch? In our September 2000 article "New Frequencies for Medical Telemetry: FCC's Plan Is Final--Now What?" we discussed some of the changes affecting telemetry. In the article that follows, we review those changes and explain what your facility needs to do in response.