CN105073051A - 用于多电极阵列导管的网篮 - Google Patents

用于多电极阵列导管的网篮 Download PDF

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CN105073051A
CN105073051A CN201480013133.0A CN201480013133A CN105073051A CN 105073051 A CN105073051 A CN 105073051A CN 201480013133 A CN201480013133 A CN 201480013133A CN 105073051 A CN105073051 A CN 105073051A
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electrode assembly
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CN105073051B (zh
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B·J·伊莱亚森
D·C·德诺
D·E·贾斯特
E·J·沃斯
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St Jude Medical Atrial Fibrillation Division Inc
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Abstract

提供一种电生理导管。在一个实施例中,导管包括具有近端和远端的可变形细长轴杆,以及联结至轴杆远端的网篮电极组件。网篮电极组件包括近端和远端,且构造成能呈现压缩状态和扩张状态。电极组件进一步包括一个或多个管状筋条,该管状筋条具有布置在其上的多个电极以及多个导体。所述多个导体中的每个均从所述多个电极中相应的一个穿过该管状筋条延伸至网篮电极组件的近端。管状筋条构造成在扩张状态下呈现非平面的(如扭曲或螺旋的)形状。

Description

用于多电极阵列导管的网篮
相关申请的交叉引用
本申请要求于2013年3月8日提交的美国专利申请号13/790,110的优先权,其在此通过援引纳入,如同其全文记载于本文中。
技术领域
本发明涉及电生理导管。具体地,本发明涉及一种电生理导管,其能在导管接触和不接触组织时都更均匀分布电极,从而能更均匀地对组织中的电活动采样。
背景技术
电生理(EP)标测导管用于生成目标区域中的组织电生理图像。众所周知,EP标测数据可用于体内组织的诊断和治疗。例如,心脏组织的EP图像能用于引导消融导管,该消融导管用于将电刺激传递到心脏内的目标区域并引起组织坏死。消融导管可用于引起心脏组织坏死以修正一些症状,比如房性和室性心律失常(包括但不限于异位性房性心动过速、心房颤动、心房扑动和室性心动过速)。除了引导消融导管,EP图像还能用于评估消融治疗的效果,或者定位异常来源或关键峡部。
EP标测导管包括在远端的一个或多个电极,该电极能对组织中的电活动采样。许多EP标测导管具有较大数量的电极或电极阵列,以便能在较大的目标区域中进行采样并减少操作时间。参见图1,现今使用的一类EP标测导管10包括布置在导管10远端的可折叠且可扩张的网篮电极组件12。当操纵导管10穿过引导器鞘移向体内的目标区域时,网篮电极组件12呈现压缩状态,在导管到达目标区域并从鞘中移出后,网篮电极组件12呈现扩张状态。网篮电极组件12包括布置有电极16的多个筋条14。各筋条14在近端和远端联结到一起,并在网篮电极组件12处于扩张状态时向外弯曲(即呈现弧形)。
上述讨论仅仅意在说明本发明的领域,不应视为对权利要求书范围的限制。
发明内容
本发明涉及一种电生理导管。具体地,本发明涉及一种电生理导管,其在导管接触和不接触组织时都能够更均匀分布电极,因此能更均匀地采样组织中的电活动。
根据本发明至少一个实施例的电生理导管包括具有近端和远端的可变形细长轴杆。导管进一步包括联结至轴杆远端的网篮电极组件。网篮电极组件包括近端和远端,且构造成能呈现压缩状态和扩张状态。网篮电极组件包括布置有多个电极的筋条。筋条构造成在扩张状态下呈现非平面形状。筋条可例如呈现扭曲形状,特别是螺旋形。
根据本发明至少另一个实施例的电生理导管包括具有近端和远端的可变形细长轴杆。导管进一步包括联结至轴杆远端的网篮电极组件。网篮电极组件包括近端和远端,且构造成能呈现压缩状态和扩张状态。网篮电极组件包括多个第一筋条。所述多个第一筋条中的每个均构造成在扩张状态下呈现非螺旋形的形状。网篮电极组件进一步包括第二筋条。第二筋条包括布置在其上的电极,且构造成在扩张状态下呈现螺旋形。
根据本发明至少另一个实施例的电生理导管包括具有近端和远端的可变形细长轴杆。导管进一步包括联结至轴杆远端的网篮电极组件。网篮电极组件包括近端、远端和中心纵轴线,且构造成能呈现压缩状态和扩张状态。网篮电极组件包括第一筋条。第一筋条包括布置在其上的电极,且在扩张状态下包括相对于轴线的第一最大半径。网篮电极组件进一步包括第二筋条。第二筋条包括布置在其上的电极,且在扩张状态下包括相对于轴线的第二最大半径。第二最大半径不同于第一最大半径。
根据本发明一个或多个实施例的电生理导管可在导管接触和不接触组织时都能更均匀分布电极,因此能更均匀地采样组织中的电活动。
通过阅读以下描述和权利要求书并参考附图,本发明的上述和其它的方面、特征、细节、效用和优点将得到显现。
附图说明
图1是现有技术的电生理标测导管的透视图。
图2是根据本发明一个实施例的电生理导管的透视图。
图3是图2电生理导管的一部分的放大透视图。
图4是图3电生理导管沿图3中4-4线的截面图。
图5是示出图3导管的网篮电极组件筋条在该组件沿导管纵向压缩时的布置形式的示意图。
图6是根据本发明另一个实施例的电生理导管的一部分的放大透视图。
图7是根据本发明另一个实施例的电生理导管的一部分的放大透视图。
图8是根据本发明另一个实施例的电生理导管的一部分的放大透视图。
图9是根据本发明另一个实施例的电生理导管的一部分的放大透视图。
具体实施方式
针对各种不同的装置、系统和/或方法,本文描述了多个不同的实施例。这里给出了许多具体细节,以便全面理解如说明书所述和附图所示的实施例的整体结构、功能、制造和应用。但本领域技术人员将理解,实施例可不按照所述具体细节实施。在其它情况下,不再详细描述公知的操作、部件和元件,以免模糊说明书中描述的实施例。本领域普通技术人员将理解,这里描述和示出的实施例是非限制性实例,进而可理解本文公开的结构和功能的具体细节是代表性的,并不一定限制实施例的范围,实施例的范围仅由所附权利要求书限定。
在整篇说明书中,表述“不同实施例”、“一些实施例”、“一个实施例”、或“实施例”等意指联系该实施例描述的特定特征、结构或特性被包括在至少一个实施例中。因此,整篇说明书中多次出现的短语“在不同实施例中”、“在一些实施例中”、“在一个实施例中”或“在实施例中”等不一定全都指代同一实施例。此外,在一个或多个实施例中,特定特征、结构或特性可按任何合适方式组合。因此,联系一个实施例示出或描述的特定特征、结构或特性可无限制地与一个或多个其它实施例的特征、结构或特性进行整体或部分组合,只要这种组合不是不合逻辑或无功能的。
应理解,整篇说明书中所用术语“近”和“远”是对于操纵着用于治疗病人的器械一端的临床医生而言的。术语“近”是指器械最靠近临床医生的那部分,术语“远”是指最远离临床医生的那部分。还应理解,为了简明和清楚,本文可参照所示实施例来使用空间术语如“竖直”、“水平”、“上”和“下”。但是,手术器械可在许多方向和位置上使用,这些术语并不意在成为限制性和绝对化的。
现在参见附图,其中同样的参考标号用于标注各视图中的相同部件,图2示出根据本发明的电生理导管18的一个实施例。导管18被提供用于产生组织特别是心脏组织的电生理图像。但是应理解,导管18可用在除心脏组织以外的组织中。导管18可包括缆线连接器或缆线接口20、手柄22、具有近端26和远端28的轴杆24以及网篮电极组件30。导管18还可包括这里未示出的其它常规部件,比如偏转机构、附加电极和相应的导体或导线。
连接器20给缆线提供机械和电气连接,该缆线从被构造成接收网篮电极组件30所生成信号的电子控制单元(ECU)(未示出)或类似装置延伸出。连接器20可以是本领域常规的连接器,布置在导管18的近端26。
手柄22给医生提供握持导管18的位置,且可进一步提供用于在体内操纵或引导轴杆24的机构。例如,手柄22可包括这样的机构,其能改变穿过导管18延伸至轴杆24远端28的导丝长度,以操纵远端28进而操纵轴杆24。手柄22也可以是本领域常规的手柄,且应理解手柄22的结构可以改变。
轴杆24是构造成在体内移动的可变形细长构件。轴杆24支撑电极组件30和相关的导体,在一些实施例中,轴杆24还支撑用于信号处理和调节的附加电极。轴杆24还可构造成允许输送、递送和/或移除流体(包括冲洗流体或体液)、药物和/或手术工具或器械。轴杆24可由常规材料比如聚氨酯制成,并限定出被构造成安置和/或输送导电体、流体、药物、导丝或者手术工具或器械的一个或多个管腔。可穿过引导器鞘将轴杆24引进血管或其它体内结构中。然后,利用导丝或牵引丝或本领域已知的包括遥控引导系统在内的其它机构,可操纵或引导轴杆24穿过身体到达期望位置,比如到达目标区域中的组织。
现在参见图3和图4,电极组件30提供用于实施组织电生理检查的机构。组件30可联结至轴杆24的远端,且包括近端32和远端34。组件30可包括布置有电极的多个筋条36,所述多个筋条形成被构造成可呈现压缩状态和扩张状态的电极“网篮”。组件30可在没有外力作用在组件30上时呈现扩张状态(即组件30可被偏压至扩张状态),或者可通过机械机构(比如被拉动或推动的丝线)迫使组件30到达扩张状态。组件30可例如在导管18被操纵穿过体内的引导器鞘移向目标区域时呈现压缩状态,在导管18从该鞘露出时,组件30呈现扩张状态。筋条36构造成按预定构型支撑电极,以允许对组织中的电活动进行接触和/或非接触标测。参见图4,每个筋条36均可包括管状体38、用于支撑和偏压本体38以呈现出预定形状的机构比如丝线40、一个或多个电极42以及相关的导体44。虽然本文示出了筋条、比如筋条36的特定实施例,但应理解(多个)筋条可以按多种方式构造。例如,在一个实施例中,一个或多个筋条可以包括如美国专利申请号12/958,992(公开在美国专利申请公开号2012/0143298A1中)所描述和示出的柔性回路,其全部公开内容通过援引纳入本文。筋条和/或网篮电极组件的其它实施例在美国专利申请号13/072,357(公开在美国专利申请公开号US2011/0213231A1中)和美国专利申请号13/340,760中的一个或多个中有描述,其全部公开内容通过援引纳入本文。
本体38给电极42提供结构支撑并使导体44隔绝于体液和其它元件。参见图4,本体58的形状呈管状,并且可呈环状。但应理解,本体38的形状可以改变。本体38可由下列材料制成:传统聚合材料比如聚氨酯,尼龙或热塑性弹性体比如Arkema,Inc.公司售卖的注册商标为“PEBAX”的弹性体,以及增强材料比如金属编织带。本体38可限定出中心管腔46,该中心管腔在本体38的近端48和远端50之间延伸且构造成允许丝线40和导体44通过。但应理解,作为替代形式,本体38可限定出一个或多个通道,每个通道均构造成接收丝线40和导体44的其中一个。在所示实施例中,丝线40被示出为处于管腔46的中心,导体44围绕丝线40周向布置。但应理解,丝线40和导体44在管腔46内的相对布置形式可以改变。
丝线40被设置用于支撑和偏压本体38以呈现预定形状。丝线可由形状记忆合金比如镍钛诺(镍钛合金)制成。丝线从本体38的近端48穿过本体38的管腔46延伸至远端50,且可延伸穿过多个筋条36的本体38以将一个或多个筋条连接到一起。替代地或附加地,筋条36可通过铰链连接器或按照2011年12月30日提交的美国专利申请号13/340,760中描述和示出的任何方式在远端50进行联结,该文献的全部公开内容被援引纳入本文。网篮电极组件30的远端34可特别构造成小而钝的机械连接点,以使导管18的远端部分可以安全地挤压组织。
再参见图3,电极42可构造成诊断、感应和测量组织比如心脏组织中的电活动。一个或多个电极42还可用于对组织进行消融治疗。电极42可以包括围绕本体38布置的环形电极,且可由铂或其它导电材料制成。每个电极42均联结至相应的导体44。根据本发明的一个方面,电极42可沿电极36不均匀隔开。例如,参见图5,筋条36A上的一对相邻电极42比如电极42A1、42A2之间的距离d1可以不同于在相同筋条36A上的另一对相邻电极比如电极42A2、42A3之间的距离d2。根据一个实施例,筋条36上的相邻电极42之间的距离可在筋条36的中点处或附近为最小,并朝向每个筋条36的两端增加。这种构型允许在网篮电极组件完全扩张时电极42分布较为均匀。具体地,在组件10处于扩张状态时,相邻筋条36上的电极42之间的间隔在筋条36的中点附近较大且在筋条36的端部附近较小。通过减小在每个筋条36中点附近的相邻电极42之间的间隔并增加在每个筋条36两端附近的相邻电极42之间的间隔,当组件10处于扩张状态时,各筋条36上的相邻电极42之间的不同间隔能补偿相邻筋条36上的电极42之间的相对间隔。电极42沿组件30中不同筋条36的布置也可以不同。具体地,筋条36A上的最远端电极42A1与筋条36A远端50之间的距离d3可以不同于另一个筋条36B上的最远端电极42B1与筋条36B远端50之间的距离d4。类似地,各筋条36上的相应电极42距筋条36的近端48或远端50的距离可以变化(例如,筋条36近端与从筋条36近端48起第三个电极42之间的距离不同于另一个筋条36近端48与从该另一个筋条36近端48起第三个电极42之间的距离)。
再参见图4,导体44可构造成将电信号从电极42经过导管18的轴杆24传输至电子控制单元或类似装置。导体44可包括丝线或线缆或其它机构用于传递信号,且可布置在给定筋条36的本体38的管腔46内。每个导体44均可在远端联结至相应电极42,并可穿过管腔46延伸至网篮电极组件30的近端32。
如上所述,每个筋条36的本体38均可被偏压成在组件30处于扩张状态时呈现出预定形状。根据本发明的一个方面,每个筋条36均可构造成在组件30处于扩张状态时呈现出非平面形状,比如扭曲形状(如螺旋形)。螺旋形的使用例如在接触或非接触标测时都能更均匀地分布电极,进而能在组织中更均匀地采样电活动。螺旋形的使用还允许利用可被医生拉动或推动的丝线来控制组件30在压缩状态和扩张状态之间的转换。在所示实施例中,导管18包括八个螺旋形筋条36。参见图5,当组件30在组件30和导管18的纵向上被压缩时,组件30可形成花形图案。结果,与图1的现有技术设计相比,筋条36上的电极42更均匀地分布在整个图案上,因此更均匀地分布在接触组织的区域中,而当图1的组件12在纵向上被压缩时,其中的电极16在筋条14的近端和远端附近相隔较密,但在各个筋条14的中点附近相隔较远。示出的导管18可被证明能例如用于生成肺静脉图像,该图像目前采用螺线形或环形电极组件来生成。类似地,当组件30因接触组织而在横向(例如垂直于导管纵向的方向)上被压缩时,筋条36的螺旋形减弱了图1所示设计中的距接触点最近的某些筋条远离彼此(并朝向其它相邻筋条)移动的趋势,因为每个筋条36都有一部分位于组件30的关于接触点的径向相对侧。再参见图5,电极42可沿每一个筋条36不均匀地隔开,或者沿任何两个筋条布置在各不同的相对位置上,如上所述,以进一步促成电极42更均匀的分布。在多个螺旋形筋条36上布置电极42的方法是,将电极42以离筋条36的端部48或50的第一距离布置在一个筋条36上。下一个电极42可以以不同于第一距离的离筋条36的共同端部48或50的第二距离布置在不同的筋条上-或是布置在与第一筋条36相邻的筋条上,或是布置在非相邻的筋条36上且两筋条之间的间隔限定出固定转角。之后的电极可如此布置在各筋条36上,即,(i)相对于具有最近布置的电极42的筋条36旋转同一固定转角,并且(ii)相对于具有最近布置的电极42的筋条36增加离共同端部48或50的距离。另一种方法可以是,将多个电极42以离筋条36的共同端部48或50的第一距离布置在一子组筋条36(例如图5所示的每隔一个的所有筋条36或者非相邻筋条36的其它组合)上,然后将多个电极42以不同于第一距离的离筋条36的共同端部48或50的第二距离布置在另一子组筋条36上,并且之后的电极以类似于上文所述的方式布置。
再参见图3,根据本发明的一个方面,导管18可进一步包括用于使网篮电极组件30的一个端部32、34相对网篮电极组件30的另一端部32、34旋转的机构,比如中心支柱54。在一些实施例中,支柱54可包括丝线或电缆。支柱54可刚性联结至网篮组件30的远端50,且可联结至连接器52。支柱54延伸穿过轴杆24,且可以是相对轴杆24可旋转的。手柄22可以包括诸如旋转致动器的机构,医生或自动控制器通过该机构可使支柱旋转,从而引起组件30的远端34相对组件30的固定近端32旋转。通过这种方式,医生可以控制筋条的螺距、组件30的机械刚度和各电极42的间隔。支柱54可相对轴杆24轴向移动,以使支柱54的长度随网篮电极组件30的压缩或扩张而改变。
如上文所讨论,电极42可沿筋条36不均匀隔开,以在组件30处于扩张状态时使电极42更均匀地分布。但是,参见图6,还示出有根据本发明的电生理导管56的另一个实施例。导管56与导管18基本相似,但每个筋条36上的电极42沿筋条36均匀隔开和/或布置在每个筋条36上的相同位置,这样一个或有限数量的筋条36可用于更高效地制造导管56。尽管导管56可能不会实现在导管18中实现的电极42最优布置,但是相对于现有技术设计,导管56上螺旋筋条36的使用仍提供了电极42在接触和非接触标测时的改良分布。
在图3示出的实施例中,每个筋条36具有相同的螺距。现在参见图7,其示出根据本发明的电生理导管58的另一个实施例。导管58与导管18基本相似,但是包括不同的网篮电极组件60。如导管18的网篮电极组件30一样,组件60包括被构造成在组件60处于扩张状态时呈现螺旋形的筋条62、64。但在组件60中,筋条62具有不同于筋条64的螺距。结果,当组件60处于扩张状态时,筋条62限定出一个周向或球形的包络(由虚线66示出),而筋条64限定出另一个周向或球形的包络(由虚线68示出)。换言之,当网篮电极组件60处于扩张状态时,筋条62离网篮电极组件60的中心纵轴线70的最大径向距离不同于筋条64离轴线70的最大径向距离。导管58可例如在非接触标测中具有优势。具体地,组件60与组织的横向接触可引起筋条64弯曲和变形从而不再呈现其理想的扩张状态,尤其是在筋条64的近端和远端的中点附近,这里可能包括用于采样电活动的重要位置。但是筋条62可以维持其理想扩张状态并继续在期望位置上进行采样。在示出的实施例中,筋条62、64绕轴线70沿相同方向旋转。但是,在替代实施例中,筋条62、64可绕轴线70沿相反方向旋转。筋条62、64的(例如通过使用图3所示支柱54实现的)旋转将引起筋条62、64中之一的螺距增大同时减小其离轴线70的最大径向距离,并且将引起筋条62、64中另一的螺距减小同时增大其离轴线70的最大径向距离。根据本实施例的网篮电极组件使医生能针对距网篮形心的半径来改变电极分布。
现在参见图8,其示出根据本发明的电生理导管72的另一个实施例。导管72与导管18和58基本相似,但包括不同的网篮电极组件74。如导管58的网篮电极组件60一样,组件74包括两种不同类型的筋条76、78。筋条76构造成当组件74处于扩张状态时呈现螺旋形。但是,筋条78构造成当组件74处于扩张状态时呈现非螺旋形的形状。具体地,筋条78可呈弧形“经线”或类似于图1实施例中筋条14的平面形状。当组件74处于扩张状态时,筋条76和筋条78也限定出不同的周向或球形的包络80、82。如示出的实施例所示,当组件74处于扩张状态时,筋条76离组件74的中心纵轴线84的最大径向距离可小于筋条78离轴线84的最大径向距离。在图8所示的实施例中,筋条76、78均包括电极。参见图9,根据本发明的电生理导管86的另一个实施例可与电生理导管72基本相似,但可包括不同的网篮电极组件88。组件88与组件74基本相似,但包括筋条90。筋条90与筋条78基本相似,但不包括电极。
尽管根据本发明系统的具有一定特殊性的多个实施例已在上文描述,但是本领域技术人员可对已公开的实施例作出众多变型,而不背离本发明的范围。所有的方向术语(例如上、下、向上、向下、左、右、向左、向右、顶、底、上方、下方、竖直、水平、顺时针和逆时针)仅用于识别目的,以帮助读者理解所公开实施例,而不产生尤其对于所公开实施例的位置、取向或使用的限制。连接术语(例如附接、联结、连接等)可作广义解释,且可包含元件连接部中间的中间构件和元件之间的相对运动。因此,连接术语不一定暗示两个元件直接连接并相对彼此固定。包含在上文描述中或显示在附图中的所有事物均应仅解释为说明性的而非限制性的。可以对细节或结构进行改变,而不背离由所附权利要求书限定的本发明。
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1.一种电生理导管,包括:
具有近端和远端的细长且可变形的轴杆;以及
联结至所述轴杆的远端的网篮电极组件,所述网篮电极组件包括近端和远端,构造成能呈现压缩状态和扩张状态,且包括第一筋条,所述第一筋条具有布置在其上的多个电极;
其中,所述第一筋条构造成在所述扩张状态下呈现非平面形状。
2.根据权利要求1所述的电生理导管,其中,所述非平面形状包括扭曲形状。
3.根据权利要求1所述的电生理导管,其中,所述扭曲形状包括螺旋形。
4.根据权利要求1所述的电生理导管,其中,所述网篮电极组件包括第二筋条,所述第二筋条具有布置在其上的电极,所述第二筋条构造成在所述扩张状态下呈现螺旋形。
5.根据权利要求4所述的电生理导管,其中,所述第一筋条在所述扩张状态下的螺距不同于所述第二筋条在所述扩张状态下的螺距。
6.根据权利要求2所述的电生理导管,其中,在所述扩张状态下,从所述第二筋条上的所述电极至所述网篮电极组件的远端的距离不同于从所述第一筋条上的所述多个电极中的任一个至所述网篮电极组件的远端的距离。
7.根据权利要求1所述的电生理导管,其中,所述网篮电极组件包括第二筋条,所述第二筋条具有布置在其上的多个电极,所述第二筋条构造成在所述扩张状态下呈现出非螺旋形的形状。
8.根据权利要求7所述的电生理导管,其中,在所述网篮电极组件处于所述扩张状态时,所述第二筋条离所述网篮电极组件的中心纵轴线的最大径向距离不同于所述第一筋条离所述中心纵轴线的最大径向距离。
9.根据权利要求1所述的电生理导管,其中,所述多个电极中的第一和第二电极之间的距离不同于所述多个电极中的第二和第三电极之间的距离。
10.根据权利要求1所述的电生理导管,其中,所述第一筋条呈管状且包括多个导体,所述多个导体中的每个均从所述多个电极中相应的一个穿过所述第一筋条延伸至所述网篮电极组件的近端。
11.一种电生理导管,包括:
具有近端和远端的细长且可变形的轴杆;以及
联结至所述轴杆的远端的网篮电极组件,所述网篮电极组件包括近端和远端,且构造成能呈现压缩状态和扩张状态,所述网篮电极组件包括:
多个第一筋条,所述多个第一筋条中的每个均构造成在所述扩张状态下呈现非螺旋形的形状;和
第二筋条,所述第二筋条包括布置在其上的电极,且构造成在所述扩张状态下呈现螺旋形。
12.根据权利要求11所述的电生理导管,其中,所述多个第一筋条中的每个均包括布置在其上的电极。
13.根据权利要求11所述的电生理导管,其中,所述网篮电极组件包括第三筋条,所述第三筋条具有布置在其上的电极,所述第三筋条构造成在所述扩张状态下呈现螺旋形。
14.根据权利要求13所述的电生理导管,其中,所述第二筋条在所述扩张状态下的螺距不同于管状的所述第三筋条在所述扩张状态下的螺距。
15.根据权利要求11所述的电生理导管,其中,所述第一筋条中的每个和所述第二筋条包括:
布置在其上的多个电极;以及
多个导体,所述多个导体中的每个均从所述多个电极中相应的一个延伸至所述网篮电极组件的近端。
16.根据权利要求11所述的电生理导管,其中,在所述网篮电极组件处于所述扩张状态时,所述第二筋条离所述网篮电极组件的中心纵轴线的最大径向距离不同于所述多个第一筋条中的每个离所述中心纵轴线的最大径向距离。
17.一种电生理导管,包括:
具有近端和远端的细长且可变形的轴杆;以及
联结至所述轴杆的远端的网篮电极组件,所述网篮电极组件包括近端、远端和中心纵轴线,且构造成能呈现压缩状态和扩张状态,所述网篮电极组件包括:
第一筋条,所述第一筋条包括布置在其上的电极,且在所述扩张状态下包括相对于所述轴线的第一最大半径;和
第二筋条,所述第二筋条包括布置在其上的电极,且在所述扩张状态下包括相对于所述轴线的第二最大半径,所述第二最大半径不同于所述第一最大半径。
18.根据权利要求17所述的电生理导管,其中,所述第一和第二筋条中的至少一个在所述扩张状态下呈现螺旋形。
19.根据权利要求17所述的电生理导管,其中,所述第一和第二筋条两者在所述扩张状态下均呈现螺旋形,所述第一筋条的螺距不同于所述第二筋条的螺距。
20.根据权利要求17所述的电生理导管,其中,所述第一和第二筋条中的每个均呈管状且包括:
布置在其上的多个电极;以及
多个导体,每个所述导体均从所述多个电极中的相应一个延伸至所述网篮电极组件的近端。
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