CN101534708A - Ecg电极接触质量测量系统 - Google Patents
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
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- A—HUMAN NECESSITIES
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Abstract
提供了用于生成指示与患者耦合的多个电极的接触质量的输出信号的系统和方法。与参考电极耦合的信号发生器向患者注入交变信号。每者与所述多个电极中的相应一个耦合以检测来自患者的输入信号的多个差分放大器用于对所述的相应输入信号做出响应以输出相应的输出信号。由所述的相应的差分放大器生成的输出信号指示相应电极的接触质量。
Description
技术领域
本发明总体上涉及针对能够获取患者心电图(ECG)的多电极诊断系统的电极接触质量的测量,更具体而言,涉及动态地测量共模抑制性能,以实现测量电极接触质量和ECG信号获取准确度的目的的测量系统。
背景技术
对于将ECG电极施加到患者身上的临床医师而言,了解所述电极是否适当地连接到了患者身上是有用的。用于测量电极接触状态的现有技术方法归为两个基本类别。一类是分别向各个电极中的每者施加电流。另一类是向患者施加电压,所述电压为连接至患者的所有感测电极所通用。
典型的ECG电路的输入阻抗被设计得非常高,因此,在每一ECG输入处施加信号需要源阻抗非常高的电流源。这一电流源可以是交流(AC)信号或直流(DC)信号。连接至患者的电极之一为参考电极。典型地,参考电极是标准导联放置中的右腿电极。所述参考电极是从患者到测量装置的低阻抗连接,所述测量装置被配置为基于所得到的每一相应电极处的电压评估电极接触质量。每一电流源的返回路径均通过所述参考电极。在每一电极处看到的电压均为所述参考电极和各个电极上的电压降的函数。
将AC或DC电流源施加到每一输入上的缺点在于,这在高阻抗设计和板泄漏非常关键的点上向每一输入增加了显著的电路。另一缺点在于,如果由于高湿度的环境条件所导致的硬件故障或板泄漏而使电缆或输入放大器的输入阻抗劣化,那么这些技术可能在引线实际上未得到连接时错误地指示引线得到了连接。
向每一输入电极施加DC电流源的另一缺点在于,由于电流流经电解质抵达电极的金属界面的原因,所述DC电流将生成电压,从而建立与皮肤接触阻抗的DC电阻分离的DC偏移电势。如果这一电极电势受到患者移动的调制,那么其可能成为噪声源。为了使所述DC偏移电势最小,必须采用10nA量级的非常小的DC电流。但是,这样的小电流是非常难以稳定地实现的,而且潮湿环境中的板泄漏可能潜在地抵消这样的小电流,从而导致不正确的读数。DC电流法的另一缺点在于,所述电路不能对凝胶与金属界面间的DC偏移电势和皮肤与电极接触阻抗之间的电势做出区分。通常,所述DC电流法仅限于检测引线得到了连接,但是不能确定连接的质量。
在参考电极处施加电压,并在输入引线处测量这一电压是一种简单得多的用于验证已经将输入引线连接到了患者身上的方法。这一方法能够简单地单独考察每一引线,以辨别信号幅度是否具有足够的水平,或者对两条或更多条引线进行差异比较,以查看共模信号的抵消程度。施加到参考电极上的电压将必须含有AC分量,从而不被每一电极的DC偏移电势混淆。
与施加作为电流源或者作为参考电极处的电压的AC信号的方法相关的难点在于从预期的ECG信号中去除所述信号。典型地,内部起搏器的步脉冲检测是输入信号的高带宽测量。必须注意不能影响ECG带宽之外的这一步脉冲检测,也不能影响ECG带宽之内的ECG信号。因此,将AC信号用于引线接触质量检测为信号处理增加了相当大的复杂性,其中所述信号处理是从之后用于ECG和步脉冲信号处理的数据中准确去除所述AC信号所需的处理。
发明内容
根据本发明的原理,提供了一种用于生成指示与患者耦合的多个电极的接触质量的输出信号的系统。所述系统包括与参考电极耦合并用于输出交变信号的信号发生器以及多个差分放大器。每一差分放大器具有与所述多个电极中的相应电极耦合的第一输入,还具有与浮置公共节点耦合的第二输入。所述差分放大器用于响应于施加至相应的第一输入的输入信号输出相应的输出信号。所述输出信号指示相应的电极的接触质量。
本发明的另一方面提供了一种用于生成指示与患者耦合的多个电极的接触质量的输出信号的系统。所述系统包括与参考电极耦合并用于输出交变信号的信号发生器和差分阵列放大器。所述差分阵列放大器用于输出指示相应电极的接触质量的相应输出信号。所述差分阵列放大器具有多个输入和对应的多个差分放大器级。将每一输入配置为与所述多个电极中的相应一个耦合。每一差分放大器级包括具有与所述相应输入耦合的第一输入、与第一浮置公共节点耦合的第二输入和与第二浮置公共节点耦合的输出。所述差分放大器级还包括并联耦合在所述输出和所述第二浮置公共节点之间的第一电容器—电阻器对、并联耦合在所述第二输入和所述第二浮置公共节点之间的第二电容器—电阻器对以及串联耦合在所述第二输入和所述第一浮置公共节点之间的第三电容器—电阻器对。
本发明的另一方面提供了一种用于确定与患者耦合的多个电极的接触质量的方法。所述方法包括向患者施加交变信号并针对每一电极检测来自患者的相应输入信号。使所述电极中的每者与相应差分放大器的第一输入耦合,使每一差分放大器的第二输入与浮置公共节点耦合。所述方法还包括响应于对相应输入信号的检测生成相应的输出信号,并评估相应输出信号中的每者。由响应于所述相应输入信号生成的相应输出信号的相移和衰减确定电极的接触质量。
附图说明
在附图中:
图1是根据本发明的实施例的电极接触质量测量系统的示意图;
图2是根据本发明的另一实施例的电极接触质量测量系统的示意图;
图3是根据本发明的另一实施例的电极接触质量测量系统的示意图;
图4是根据本发明的另一实施例的电极接触质量测量系统的示意图;
图5是根据本发明的另一实施例的电极接触质量测量系统的示意图。
具体实施方式
在下文中将对某些细节加以阐述,以提供对本发明的充分理解。但是,对于本领域技术人员而言,显然可以在不需要这些具体细节的情况下实践本发明。此外,文中描述的本发明的具体实施例是通过举例的方式提供的,不应将其用于将本发明的范围限定为这些具体实施例。在其他情况下,为了避免使本发明不必要地混淆,没有详细示出已知的电路、控制信号、定时协议和软件操作。
图1示出了根据本发明的实施例的电极接触质量测量系统100。系统100包括AC信号发生器106,其用于将共模AC信号V1通过参考电极REF注入到患者体内,在下文中将对其予以更为详细的说明。系统100还包括配置为用于四电极ECG电路的差分阵列放大器102。所述四个电极包括一个参考电极REF和三个感测电极。但是,本发明的备选实施例可以包括更多的或者更少的与患者耦合的电极。尽管文中描述的具体实施例是针对具有四个电极的应用的,但是应当认识到,下述说明足以允许本领域技术人员实践具有不同数量的电极的实施例。此外,尽管文中描述的具体实施例是用于ECG系统的,但是可以将本发明的原理的部分或全部应用于测量患者的生物电势的其他系统,例如,心电图仪、遥测装置、Holter监测器、事件监测器、除颤器和具有ECG能力的超声系统。
差分阵列放大器102包括三个运算放大器(opamps)110A-110C以及由电阻器120A-120C和124A-124C表示的相关增益设置反馈阻抗。电阻器120A-120C优选相等(R1=R3=R5),电阻器124A-124C优选相等(R2=R4=R6),在下文中将对其予以更为详细的说明。将电阻器120A-120C与浮置公共节点122耦合。运算放大器110A-110C中的每者具有相应的输入节点104A-104C,所述输入节点通过相应的电极耦合,从而从患者接收电信号。在图1中通过阻抗50给出了患者皮肤—电极接触阻抗的模型,其具有四对并联的电阻器—电容器电路56A-56D,它们中的每者表示与患者耦合的四个电极中的一个的阻抗。而且图1还示出了表示用于每一电极的ECG电缆护套(shield)的电容器60A-60D。
由运算放大器110A-110C响应于来自患者电极的输入信号Ain、Bin、Cin生成相应的输出信号Aout、Bout、Cout,并在输出节点130A-130C处提供所述输出信号。将Aout、Bout和Cout信号提供给常规模数(A/D)转换器(未示出),从而将所述输出信号转换成表示所述输出信号的数字数据。通过常规处理电路(未示出)对所述数字数据加以评估,以判断所述输出信号中的任何一者是否超过了阈值电压。当有输出信号超过了阈值电压时,其表示电极接触差。
可以在数学上,通过下述方程表征差分阵列放大器102。Ain、Bin和Cin分别等于输入节点104A、104B和104C处的电压,Aout、Bout和Cout分别等于输出节点130A、130B和130C处的电压,并将公共节点122称为Com:
(1)(Com-Ain)/R1+(Com-Bin)/R3+(Com-Cin)/R5=0,
(2)Com*(1/R1+1/R3+1/R5)=Ain/R1+Bin/R3+Cin/R5,
(3)Com=(Ain/R1+Bin/R3+Cin/R5)/(1/R1+1/R3+1/R5),
(4)Com=Ain/(1+R1/R3+R1/R5)+Bin/(1+R3/R1+R3/R5)+Cin/(1+R5/R1+R5/R3)。
方程(4)是由方程(1)通过方程(2)和(3)展开而得到的。此外,
(5)Aout=Com+(Ain-Com)*(R2+R1)/R1,
(6)Bout=Com+(Bin-Com)*(R4+R3)/R3,以及
(7)Cout=Com+(Cin-Com)*(R6+R5)/R5。
假设R1=R3=R5并且R2=R4=R6,那么方程(4)简化为:
(8)Com=(Ain+Bin+Cin)/3。
利用方程(5)、(6)和(7),
(9)Aout-Bout=(Ain-Bin)*(R2+R1)/R1,
(10)Aout+Bout+Cout=Ain+Bin+Cin。
如方程(8)所示,公共节点122处的电压是输入节点104A-104C处的电压的平均值,并且与电阻器120A-120C和124A-124C的值无关。此外,如方程(9)和(10)所示,差分增益(Adm)等于(R2+R1)/R1,共模增益(Acm)为1。因此,差分阵列放大器102的共模抑制比等于所述差分增益。
在操作当中,将AC电压V1通过参考电极REF提供给患者,差分阵列放大器102检测作为ECG通道的输入信号的AC信号。差分阵列放大器102动态地测量在将ECG测量系统连接至患者时整个ECG测量系统的共模抑制能力。由一个电极与另一电极之间的不同输入增益或频率响应所表现出的劣化共模性能是电极接触质量差的指示。当电极接触阻抗大到足以使ECG系统的输入阻抗开始引起信号的相移和/或衰减时,将产生输入增益或频率响应的变化。
采用差分放大器的一个优点在于,从幅度上显著降低了由通过参考电极REF注入的AC电压导致的共模信号,因而对于具有良好的接触阻抗的电极而言,所述信号低于所要求的所述系统的噪声性能。但是,当电极接触阻抗超过了使ECG信号畸变的一定水平时,差分阵列放大器102会将差信号(difference signal)放大到超过系统噪声水平并且能够被检测的水平。其降低了复杂性,简化了对用于检测导联接触质量的AC信号的去除的需求。
通过采用差分阵列放大器102和所注入的AC参考信号,不管ECG系统的输入阻抗的潜在变化如何,都能够测量到相同的影响ECG获取准确性的特性。即使电缆或输入电子部件的输入阻抗发生了劣化,也不会导致当电极实际上未得到连接时显示电极得到了连接的错误指示。系统将正确地考量劣化的输入阻抗的原因,而且在电极接触阻抗显著低于所述劣化的电路输入阻抗的情况下将不会指示存在良好的连接。因此,只有在具有良好的测量质量的情况下,差分阵列放大器100的输出信号才会指示导联得到了充分的连接,而且不会错误地指示接触不良,除非测量确实存在着不准确的风险。
通过参考电极REF注入到患者体内的AC信号可以具有任何波形或频率。在备选实施例中,通过随机或伪随机噪声源生成所述共模信号。可以将所述AC信号的频率选为处于ECG带内,以测量处于预期的ECG频率上的信号质量,而不是使其局限到ECG带以外的值上。所述共模信号优选具有小幅度,从而在接触质量良好时,使所述共模信号与所述差分信号抵消,在电极接触质量差时,使所述共模信号变得明显。
图2示出了根据本发明的另一实施例的电极接触质量测量系统200。系统200包括差分阵列放大器202,其具有与差分阵列放大器102类似的部件。在图2中通过与图1中相同的附图标记表示类似的部件。差分阵列放大器202还包括由运算放大器204、电阻器210A-210C和电容器220表示的有源反馈电路。本领域技术人员已知,所述有源反馈电路的作用在于降低患者身处的共模信号。
为了注入用于导联质量检测的AC信号,使信号发生器106通过有源反馈放大器204与参考电极REF串联。采用有源反馈使患者的身体电势保持在与ECG测量电路相同的电压上。也就是说,所述反馈电路对患者电压进行有源调整,从而使处于输出节点130A-130C上的共模信号等于所注入的信号V1。由于所述放大器的共模增益为1,因而输入节点104A-104C上的共模信号被设为等于V1。差分阵列放大器202的操作与图1所示的差分阵列放大器102的操作相同,只是具有增加了有源反馈电路的好处,以降低共模噪声。
图3示出了根据本发明的另一实施例的电极接触质量测量系统300。系统300包括差分阵列放大器302,其具有与图1所示的差分阵列放大器100类似的部件。通过与图1中相同的附图标记表示图3所示的类似部件。但是,差分阵列放大器302包括用于提供单极高通滤波器和2极低通滤波器的额外电路。
通过在公共节点122和电阻器120A-120C之间耦合电容器310A-310C提供了所述高通滤波器。ECG电路需要承受高达300mV的电极中的DC偏移,但是对于实际ECG信号而言,只存在+/-5mV的偏移。所述高通滤波器允许为所述+/-5mV ECG信号提供高得多的差分增益,而不会因所述300mV的DC偏移容限而削波。更高的差分增益能够得到提高的共模抑制性能。提高的共模抑制性能允许将所注入的信号V1从ECG中去除,除非输入阻抗或者患者接触阻抗引起了将被差分阵列放大器302检测到的相移或衰减。此外,处于输入节点104A-104C处的差信号的DC电平可能相当高,并且利用高通滤波器将使DC差信号的增益降为单位增益。
所述低通滤波器包括通过使电容器306A-306C与电阻器124A-124C并联提供的第一极和通过电阻器—电容器对304A-304C提供的第二极。在抽样A/D转换器处,采用低通滤波将高频信号的电势降至一直下降到低频的伪信号(alias)。
图3的差分阵列放大器302还包括处于每一电极的运算放大器电路110A-110C之间的另一浮置公共节点320。浮置节点320按照与电阻器120A-120C所共用的浮置节点122类似的方式工作。输入节点104A-104C处的共模信号在输出节点130A-130C处仍将具有单位增益,因为由于流入电阻器314A-314C的共模电流为零,因而浮置节点320处的电压将与输入共模信号匹配。
图4示出了根据本发明的另一实施例的电极接触质量测量系统400。系统400包括差分阵列放大器402,其使差分阵列放大器102(图1)与差分阵列放大器202(图2)的反馈电路以及差分阵列放大器302(图3)的高通和低通滤波器二者相结合。在图4中采用相同的附图标记表示系统400的与系统100、200和300类似的部件。
如前所述,所述高通和低通滤波器不影响共模增益。因此,可以将有源反馈环设计为具有更高的环带宽,因为其不受与差分滤波器相关的差分增益极和零值的影响。差分阵列放大器402提供了显著的带外抑制滤波,还提供了显著的共模抑制量。
图5示出了根据本发明的电极电路的另一个例子,其建立在前述例子的原理之上。在这一构造中,通过连接503将处于电极通道放大器110A、110B和110C的输入处的公共节点502连接到反馈通路的公共节点504。已经发现这一连接在所构建的电路中提供了改善的稳定性,在所述电路中,多个通道的所有对应电阻器和电容器的值都不是精确匹配的。因而,通过使用容限更宽的部件的能力降低了所述布置的成本。而且,在电极通道的公共反馈输出504和对反馈放大器204的反馈输入之间还包含了缓冲放大器506。还发现这一实施例提供了指示参考电极的附着质量的输出410。如果参考电极接触质量差,那么通往电极通道的信号全都会受到影响,其将反映在通往反馈放大器204的缓冲反馈信号中以及由放大器204生成的有源反馈信号中。因而,来自反馈节点410的“参考输出”信号提供了参考电极的接触不良的指示。
由上文应当认识到,尽管在文中出于举例说明的目的描述了本发明的具体实施例,但是在不背离本发明的精神和范围的情况下可以做出各种修改。因此,本发明除了受到权利要求的限定外不受任何限制。
Claims (21)
1、一种用于生成指示与患者耦合的多个电极的接触质量的输出信号的系统,所述系统包括:
信号发生器,其与参考电极耦合并且用于输出交变信号;以及
多个差分放大器,每一差分放大器具有与所述多个电极中的相应电极耦合的第一输入,并且还具有与浮置公共节点耦合的第二输入,每一差分放大器用于对施加至所述相应的第一输入的输入信号做出响应以输出相应的输出信号,所述输出信号指示所述相应电极的接触质量。
2、根据权利要求1所述的系统,还包括:
反馈放大器,其具有与所述信号发生器耦合的第一输入和与所述参考电极耦合的输出,所述反馈放大器还具有与所述多个差分放大器的所述输出耦合的第二输入,每一输出通过相应的电阻器与所述第二输出耦合。
3、根据权利要求2所述的系统,还包括:
与所述多个差分放大器耦合的有源滤波器网络,将所述有源滤波器网络配置为在生成所述相应的输出信号的过程中对所述相应的输入信号滤波。
4、根据权利要求3所述的系统,其中,所述浮置公共节点为第一浮置公共节点,所述有源滤波器网络包括:
与每一差分放大器的所述输出耦合的相应的第一电容器—电阻器对,所述第一电容器—电阻器对并联耦合在所述相应的输出和第二浮置公共节点之间;
与每一差分放大器的所述第二输入耦合的相应的第二电容器—电阻器对,所述第二电容器—电阻器对并联耦合在所述相应的第二输入和所述第二浮置公共节点之间;以及
与每一差分放大器的所述第二输入耦合的相应的第三电容器—电阻器对,所述第三电容器—电阻器对串联耦合在所述相应的第二输入和所述第一浮置公共节点之间。
5、根据权利要求4所述的系统,其中,对于每一差分放大器而言,所述第二电容器—电阻器对的电阻器是相等的,并且对于每一差分放大器而言,所述第三电容器—电阻器对的电阻器是相等的。
6、根据权利要求1所述的系统,其中,使所述多个差分放大器中的每者相耦合以使共模增益为1。
7、根据权利要求1所述的系统,其中,所述多个差分放大器包括三个差分放大器。
8、根据权利要求1所述的系统,其中,所述信号发生器包括伪随机噪声发生器。
9、根据权利要求1所述的系统,其中,所述系统包含在用于获取ECG信号的ECG测量系统当中。
10、一种用于生成指示与患者耦合的多个电极的接触质量的输出信号的系统,所述系统包括:
信号发生器,其与参考电极耦合并且用于输出交变信号;以及
差分阵列放大器,其具有多个输入和对应的多个差分放大器级,将每一输入配置为与所述多个电极中的相应一个耦合,每一差分放大器级包括具有与所述相应的输入耦合的第一输入、与第一浮置公共节点耦合的第二输入和与第二浮置公共节点耦合的输出的差分放大器,每一差分放大器级还包括并联耦合在所述输出和所述第二浮置公共节点之间的第一电容器—电阻器对、并联耦合在所述第二输入和所述第二浮置公共节点之间的第二电容器—电阻器对,以及串联耦合在所述第二输入和所述第一浮置公共节点之间的第三电容器—电阻器对,所述差分阵列放大器用于对施加至所述相应的输入的相应输入信号做出响应以输出相应的输出信号,所述相应的输出信号指示所述相应的电极的接触质量。
11、根据权利要求10所述的系统,其中,所述差分阵列放大器还包括具有与所述信号发生器耦合的第一输入和与所述参考电极耦合的输出的反馈放大器,所述反馈放大器还具有与所述多个差分放大器的输出耦合的第二输入,每一输出通过相应的电阻器与所述反馈放大器的第二输出耦合。
12、根据权利要求10所述的系统,其中,使所述多个差分放大器中的每者相耦合以使共模增益为1。
13、根据权利要求10所述的系统,其中,所述系统包含在用于获取ECG信号的ECG测量系统当中。
14、一种用于确定与患者耦合的多个电极的接触质量的方法,所述方法包括:
向所述患者施加交变信号;
针对所述电极中的每者检测来自所述患者的相应输入信号,所述电极中的每者与相应的差分放大器的第一输入耦合,每一差分放大器的第二输入与浮置公共节点耦合;
对检测所述相应的输入信号做出响应以生成相应的输出信号;
评估所述相应的输出信号中的每者;以及
由对所述相应的输入信号做出响应而生成的所述相应的输出信号的相移和衰减确定电极的接触质量。
15、根据权利要求14所述的方法,还包括将所述输出信号反馈给反馈差分放大器,所述反馈差分放大器产生反馈信号,所述反馈信号将驱动所述输出信号的平均值等于所述交变信号。
16、根据权利要求14所述的方法,还包括在生成相应的输出信号的过程中对所述输入信号中的每者进行有源滤波。
17、根据权利要求16所述的方法,其中,所述浮置公共节点包括第一浮置公共节点,并且其中,对所述输入信号中的每者进行有源滤波包括:
将相应的第一电容器—电阻器对与每一差分放大器的输出耦合,所述第一电容器—电阻器对并联耦合在所述相应的输出和第二浮置公共节点之间;
将相应的第二电容器—电阻器对与每一差分放大器的所述第二输入耦合,所述第二电容器—电阻器对并联耦合在所述相应的第二输入和所述第二浮置公共节点之间;以及
将相应的第三电容器—电阻器对与每一差分放大器的所述第二输入耦合,所述第三电容器—电阻器对串联耦合在所述相应的第二输入和所述第一浮置公共节点之间。
18、根据权利要求14所述的方法,还包括:
将所述输出信号反馈给反馈差分放大器,所述反馈差分放大器产生反馈信号,从而驱动所述输出信号的平均值等于所述交变信号;以及
在生成相应的输出信号的过程中对所述输入信号中的每者进行有源滤波。
19、根据权利要求14所述的方法,其中,施加交变信号包括施加伪随机噪声信号。
20、根据权利要求15所述的方法,还包括将所述浮置公共节点与所述电极差分放大器的公共反馈节点耦合。
21、根据权利要求20所述的方法,还包括由所述反馈差分放大器产生的信号感测所述参考电极的接触质量。
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BRPI0718525A8 (pt) | 2015-10-13 |
US20100007413A1 (en) | 2010-01-14 |
JP2010508935A (ja) | 2010-03-25 |
BRPI0718525A2 (pt) | 2013-11-26 |
WO2008056309A3 (en) | 2008-07-03 |
WO2008056309A2 (en) | 2008-05-15 |
BRPI0718525B1 (pt) | 2019-01-29 |
JP5238712B2 (ja) | 2013-07-17 |
EP2086403A2 (en) | 2009-08-12 |
RU2009122182A (ru) | 2010-12-20 |
EP2086403B1 (en) | 2016-04-13 |
RU2454928C2 (ru) | 2012-07-10 |
US8086300B2 (en) | 2011-12-27 |
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