CN102006832B - 用于hf外科手术的双极钳 - Google Patents
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- A—HUMAN NECESSITIES
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
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Abstract
本发明涉及一种用于HF外科手术的双极钳,特别地用于凝结组织的外科手术,双极钳具有至少两个双极夹紧件(2),双极夹紧件可相对于彼此在打开位置与凝结位置之间移动从而限定出抓取区域(4),并且双极夹紧件具有用于凝结被夹紧件(2)抓取在抓取区域中的组织的电极(6),其中,夹紧件(2)基本上整体包括电传导芯,电传导芯由薄层电绝缘(8)围绕,其中,电极(6)在夹紧件(2)上被设置为细针状电极并穿过薄层电绝缘(8)突出到抓取区域(4)中。
Description
技术领域
本发明涉及用于HF外科手术的双极钳,该HF外科手术特别地用于凝结组织,这种双极钳具有至少两个双极夹紧件,双极夹紧件可相对于彼此在打开位置与凝结位置之间移动从而限定出抓取区域,并且双极夹紧件具有用于凝结被夹紧件抓取在抓取区域中的组织的电极。
背景技术
人体医学和兽医学中已使用高频外科手术多年,以凝结和/或切除生物组织。在适当的电外科器械的辅助下,高频电流通过待治疗的组织使得所述组织因蛋白质凝结和脱水而开始改变。该组织收缩使血管封闭并且使流血停止。随后电流强度可能增加,这导致组织流体沸腾蒸发以及细胞膜破裂,使得组织完全分离。
为了对生物组织进行热治疗,双极和单极技术均被采用。在单极设置中,通过“不同的”电极施加由HF发生器向电外科器械馈送的HF电流,同时通过患者身体的电流通路则通向“非不同的”中性电极并从此处返回到HF发生器。
然而,被配置为具有彼此电绝缘的两个电极部的双极器械变得越来越重要。电极部之间的电流通路是可预测的并且不经由穿过患者身体延伸的路径行进。这使对心脏起搏器或在手术过程中对连接至患者的其他设备产生的影响降低。
这种类型的双极器械通常被配置为夹紧钳子,通常在它们的远端包括两个夹紧件,能够通过相关联的致动装置使夹紧件朝向彼此移动以抓取组织。在夹紧位置或“凝结位置”,电流经过组织从一个夹紧件流到另一个夹紧件,使得在夹紧件之间被抓取的组织能够被HF外科手段治疗。
例如在子宫切除术过程中的使用热熔合或凝结的双极钳的情况下,当大量组织被抓取时,企图确保用于凝结的热能释放基本上限于抓紧件之间抓取表面的区域,使得其他位置的不希望的加热(侧向热损伤,带有爪背部处的凝结作用的加热)最小化。具体地,在薄、小体积结构的情况(例如,软组织,暴露的血管等)下,经精确剂量热能输出也是必要的,并且这只有在以下条件下才能得以确保:如果凝结过程中的组织体积保持被牢固地抓取并且例如不因热收缩而通过包含额外的材料而略微增加。
由EP 0 875 209 B1公开了一种用于HF外科手术的装置。所描述的是用于组织凝结的一对夹紧钳子,夹紧钳子在其远端具有两个夹紧件,夹紧件彼此连接并可通过铰接连接相对于彼此移动。这两个夹紧件限定抓取区域,在该抓取区域中,待被治疗的组织能够被稳固地夹紧。为了能够在抓取区域中对组织进行具体有效的固定,一个夹紧件具有可移动进出夹紧件的可移动固定元件。在另一夹紧件处设置有两个双极电极,双极电极通过电绝缘层彼此分离。第一电极从该夹紧件突出,同时第二电极以基本上侧向凹陷的方式围绕该第一电极。只要在两个夹紧件之间被抓取的组织以及HF发生器被激发以发生凝结电流,那么电流在第一突出电极、被抓取的组织、以及第二电极之间流动,其中在该组织中发生凝结过程。
不利地,在本文中已经表明在凝结过程中整个夹紧件变热,此外导致不希望的血管变化,即,夹紧件的侧向和后部区域中的假凝结。
WO 2004-082495 A1也公开了用于HF外科手术的这种类型的双极钳,其中也设有两个夹紧件,夹紧件彼此连接以形成用于抓取待凝结组织的爪件。如上所述,双极电极设置在一个夹紧件处,使得在抓取组织之后,电流在第一电极与第二电极之间流动。电极被配置为平台状的突起,其中第一电极设置在中心处,第二电极设置为围绕第一电极并且位于平台边缘处的环状电极。然而在此情况下也已经发现,由于热量传导离开的减少,因此无法防止承载电极的夹紧件的加热,使得在夹紧件的侧部和后部区域中也发生不希望的组织变化。而且这种配置也只能够以高成本实现,并且由于小的双极电极的分离,这种配置极易于在生产出次品。
US 2002/0013583也公开了一种用于HF外科手术的钳,此外,其中双极电极设置在不同的夹紧件上,使得电流在一个夹紧件的一个电极与另一夹紧件的另一电极之间流动。在此情况下,电极置于特别地设置在夹紧件朝向彼此的夹紧表面上的传导路径上。电极本身被配置为电极末端并被构造成以使得在抓取组织之后电极穿入待凝结的组织中。其企图在于凝结区域能够由穿入组织的单独双极电极更加精确地勾画。然而,这里也发现,组织的加热也发生在夹紧件的侧部和后部区域中,并且这种加热是在这些区域中发生不希望的组织变化的原因。此外,生产这种夹紧件包含技术性制造困难,因为将电极固定于夹紧件可能无法承受极大的机械负荷和热负荷。
发明内容
因此,本发明的目的是提供一种用于HF外科手术的双极钳,其使得凝结区域能够更加精确地对准,并且特别地防止邻近组织出现不希望的凝结,而且能够更加容易地,在更少误差的情况下,更加经济地制造该双极钳。
通过根据权利要求1和17所述的用于HF外科手术的双极钳和医疗器械实现该目的。
特别地,通过一种用于HF外科手术的双极钳实现该目的,该HF外科手术特别地用于凝结组织,双极钳具有至少两个双极夹紧件,双极夹紧件可相对于彼此在打开位置与凝结位置之间移动从而限定出抓取区域,并且双极夹紧件具有用于凝结被夹紧件抓取在抓取区域中的组织的电极,其中,夹紧件基本上整体包括电传导芯,电传导芯由薄层电绝缘围绕,其中,电极在电传导芯上被设置为针状针状电极并穿过薄电绝缘层突出到抓取区域中。
在本文中,用语“薄层”应被理解为意指这样的层,该层的体积以及,特别地该层的作用基本上可忽略,因为与每个夹紧件的电传导芯的体积直接相比,该层具有非常小的厚度。所述薄层还对夹紧件的稳定性无任何贡献并且不具有任何支撑功能。为此,每个夹紧件的电传导芯能够例如通过浸渍浴或者喷雾处理来非常容易地、快速地和不昂贵地设置用于电绝缘的这种类型的薄层。
本发明的核心在于,由于夹紧件基本上整体包括电传导芯并由薄电绝缘层围绕,因此通过设置在电传导芯上的非常细的针状电极来防止所述夹紧件的加热。由于电极作为细针状从体积非常大的电传导芯突出,因此凝结过程中在电极处产生的热量被有效地传导离开而夹紧件不会有任何可察觉的加热。
基本点在于,热释放时间、即每个电极与电传导芯以及自然地与周围到达热平衡所需的时间,非常短。
除了减少夹紧件的加热以及因此减少例如抵靠夹紧件后部的组织出现不希望的凝结之外,根据本发明的电极的设置还导致对组织体积的热收缩的影响减小。
优选地,全部电极的热容量与电传导芯的热容量的比被设计为如此小以使得在凝结过程中基本上防止夹紧件的加热。获得该作用的原因在于,电极的体积的总和比电传导芯的体积的总和小得多。以此方式配置的夹紧件受益于电极更快的加热,尤其受益于更快的冷却,以及电传导芯的不变热和因此夹紧件的不变热。
优选地,电极的表面积的总和被选择为比夹紧件的表面积的总和小得多。除了间接产生的改善的热移除之外,这还产生如下结果:非常小的电极表面处的电流强度与现有技术中公知的非常宽大的电极相比得到了增加。这导致更加快速的加热,接着又减少电传导芯和夹紧件出现不希望的加热。
优选地,电极在其自由端呈平坦的形状,从而基本上防止了所述电极穿入到在凝结位置被抓取的组织中。其后果在于,对抓取区域中组织的机械损伤减小,同时仍然可以利用集中凝结区域的优势。为此,电极优选地被配置为圆柱形。自然地,其他形式,特别是旋转对称形状的电极形式能够被选择,以基本上防止穿入到组织中。根本上优选的是,电极应被设置为至少在所述电极的基部处、即与所述电极设置在电传导芯上所处的区域处与夹紧件朝向抓取区域的夹紧件表面垂直。
优选地,电极被配置为与电传导芯一体。由此,例如可以将电传导芯与电极在单次操作中进行制造,因此降低了生产成本。这种生产方法还确保了高度稳定和结实的电极安置并因此产生非常结实的夹紧件。
然而,还可以将电极设置在电传导芯上的互补的电极容纳部中,从而例如在生产出电传导芯之后插入电极并且能够使得该电极适合于具体需求。在此情况下,还可以设计这种单独的“可调整”电极。此外,还能够将间隔件、夹紧元件、机械切割突起等以绝缘或者非绝缘方式插入适当的电极容纳部中。
电极优选地被设置在电传导芯或夹紧件上并且彼此间隔开和偏移从而分别形成中间空间,使得在凝结位置一个夹紧件的电极至少部分地沉入由另一夹紧件的电极所形成的中间空间中。因此,在该“锯齿配置”中,在凝结位置,凝结电流基本上相对于夹紧件的夹紧件表面水平地并且在相对于彼此部分地沉入的电极之间流动到相对应的中间空间中。由此,在各自的双极电极之间形成的凝结区域空间上受限。
优选地,电极被设置以使得在凝结位置组织产生凝结区域的电流在形成中间空间的电极与沉入该中间空间的电极之间流动。电极优选地彼此间隔开以使得所述凝结区域至少部分地重叠。这决定性地有助于空间上受限但是在局部非常有效的凝结。
优选地,为了获得均匀的凝结,多个单个电极的中间空间被形成为基本上相同。优选地,这自然地还意味着与中间空间临界的电极与沉入所述中间空间中的电极之间的距离基本上是相同的。夹紧件或者电传导芯上的电极可基本上呈多个平行或非平行的列设置、或者呈多个相对应的行设置,或者呈任意地设置。
优选地,薄层绝缘被配置为位于电传导芯的夹紧件表面上的绝缘板以及位于电传导芯表面剩余部分上的绝缘涂层。特别地提供了这种可能性:在通过将绝缘板推压在突出的电极上来安装电极之后,使用随后设置在夹紧件上的电极,使用预先制造并由绝缘涂层部分绝缘的完全绝缘的电传导芯。
基本上,可以使用现有技术中公知的,特别地是HF外科手术中公知的所有电绝缘和基本上耐热的材料来进行绝缘,它们能够作为薄层涂层进行涂覆并且满足相关的医疗要求。
双极钳具有这样的臂,该臂通过铰接链接相互连接并具有近侧致动装置,近侧致动装置设置在臂远侧,用于打开和关闭夹紧件,其中,电极均沿着圆形路径绕铰接连接枢转,所述电极在夹紧件打开和关闭过程中在该圆形路径上移动。
具体地,当臂被设置为呈钳子或剪子形式时,例如被设置为呈剪子式或钳子式医疗器械形式时,从电传导芯突出的电极在绕铰接链接的圆形路径上移动。如果一个夹紧件的电极进入由另一夹紧件的电极所形成的中间空间时,通过依照圆形路径进行枢转的单个电极确保相对于彼此沉入的电极的间隔在整个电极长度上保持恒定,从而确保电流在单独电极之间均匀流动。
优选地,从至少一个电传导芯突出的电极的长度与距铰接连接的各自距离成正比地增加。由此,确保了在达到凝结位置之后不久,在夹紧件的长度上看去,单独的电极基本上全部同时沉入各自的中间空间。
在从属权利要求中公开了本发明的其他实施方式。
附图说明
现在基于附图中所示的两个实施方式对本发明进行更详细的描述,在附图中:
-图1示出了HF外科手术装置的立体图,该HF外科手术装置具有根据本发明的双极钳的第一实施方式;
-图2示出了根据图1实施方式的双极钳的详细视图;
-图3示出了通过图2的双极钳的横截面图;
-图4示出了通过图2的双极钳的纵向截面图;以及
-图5示出了通过双极钳的第二实施方式的横截面图。
具体实施方式
以下,对于相同和类似的作用部件使用相同的参考标记,其中,为了区分偶尔使用上标。
图1示出了HF外科手术器械的立体图。该外科手术器械包括两个臂20,这两个臂20通过呈钳子或剪子形式的铰接连接22彼此连接,使得设置在臂20远端的两个夹紧件2可从打开位置移动到闭合位置,反之亦然。而且,在臂的近端设有在此情况下呈把手形式的两个致动装置24,致动装置24使得臂20能够打开和闭合并因此使得夹紧件2也能够打开和闭合。
夹紧件2共同形成抓取取区域4,待凝结或待进行类似HF外科手术治疗的组织(见图5)可被抓取在该抓取区域4中。为了进行HF外科手术,在夹紧件2处,具体地在朝向抓取区域4的夹紧件表面12处设有电极6,能够通过经由臂20连接的HF发生器(未示出)将所述电极设置为不同的极性。只要通过夹紧件2、具体地通过电极6使组织在抓取区域4中被抓取,那么在HF发生器激发之后,在夹紧件2与设置于其上的电极6之间有用于凝结或类似HF外科手术过程的电流流动。
图2以详细立体图示出了图1的实施方式的双极钳1,其由两个夹紧件2形成。其中清楚地示出电极6从夹紧件表面12基本上垂直地突出,电极6被设计为圆柱形的细针状电极并被设置为彼此相距具体距离14。在此实施方式中,电极6沿夹紧件2以每行两个和三个交替设置。自然地,也可以选择其他电极设置方式。
只要组织被抓取在两个夹紧件2的抓取区域4中,那么通过电极6在组织上施加电流,并且进行希望的HF外科手术。在此实施方式中,夹紧件2完全由薄层电绝缘8围绕,从而防止夹紧件2的非绝缘部分之间出现不希望的电流流动。
为了避免不希望的加热,具体地为了避免不希望的夹紧件后部13与夹紧件侧部15之间出现不希望的加热,根据本发明,夹紧件2基本上整体包括传导芯3(具体地见图3和图5)。在此所示的典型实施例方式中,电极6被与所述传导芯3整体配置(特别地见图3)。显然,夹紧件2的电极6的热容量的总和比夹紧件2或其传导芯3的热容量小得多,使得在凝结或类似HF手术过程中,不会发生夹紧件2的任何可感知的加热。
由于尺寸和质量的差异,细的电极6变热非常迅速,而传导芯3则因其大质量而仅缓慢地变热。
在HF手术结束时发生相同的情况:相比传导芯3较小的电极6冷却至环境温度要快得多,从而避免出现不希望的凝结。
此外,由于传导芯3的非常大的传导表面,并不出现因电流流动而感应产生的加热;仅在电极6处温度才快速地升高,从而可以快速地并且以空间上限制的方式进行热治疗。
除了减少加热并因此也减少不必要的组织凝结之外,夹紧件2的该实施方式和根据本发明的整个外科手术器械还导致对组织体积的热收缩影响的减小。
电极6在其自由端10具有平坦区域,使得电极6不穿入在抓取区域4中被抓取的组织中。这防止了对组织的机械损伤。
为了防止在电极区域之外的其他区域中的凝结,每个夹紧件2的每个传导芯3被用于电绝缘的薄层绝缘8围绕。在该实施方式中,该薄层绝缘8在传导芯2的整个表面上分布并特别地以浸渍涂布的形式涂覆在传导芯表面11上,其中仅电极6从薄层绝缘8非绝缘地突出并进入抓取区域4中。这里应注意,在根据本发明的夹紧件2的该实施方式中,例如也可以通过薄层8使电极6部分地绝缘,以仅使自由端10非绝缘。
在图3中示意性地示出了高频发生器26的连接,该高频发生器26与夹紧件2的每个传导芯3电连接,使得所述发生器可在凝结过程中将所述导电芯设置为不同的极性。
图4以平面图或纵向截面图示出了处于凝结位置的图3的实施方式,也就是说,夹紧件2基本上闭合并且电极6相对于彼此沉入。还示出了夹紧件2′的两个电极6、6′以及电极6″、6″′,其中电极6″、6″′设置于另一夹紧件2上(见图2)并且在这里沉入夹紧件2′处的电极中间空间14中。
可以看到电极的偏移布置。所有电极设置在各自的夹紧件2上,使得两个电极6′、6分别形成中间空间14,另一夹紧件2′的电极6″(特别地见图3)沉入到中间空间14中。
在该实施方式中,电极被设置以使得限定中间空间14的沉入的电极6″与两个电极6、6′之间的距离相等。自然地,例如,还可以将电极设置为以列或行偏移以代替所示的电极均匀分布,使得夹紧件的沉入电极由另一夹紧件的限定中间空间14的3个电极同时包围。
图5以类似于图3的横截面图示出了双极钳2的另一实施方式。然而,在此情况下,电极6并不与传导芯3一体地结合但是却均容纳在形成于各自传导芯3中的电极接纳部5中。因此,在此实施方式中,还可以将电极压入电极容纳部5中从而以导电方式结合所述电极或者以类似方式固定所述电极。代替电极的其他元件如间隔元件、固定元件等也能够由电极容纳部5容纳并固定至传导芯。
如之前实施方式中的那样,待通过凝结或类似HF外科手术技术治疗的组织30在两个夹紧件2之间被抓取在抓取区域4中。只要通过HF发生器26在夹紧件2或者传导芯3上施加电流,在不同的夹紧件2的双极电极对16之间形成空间受限的凝结区域18。在根据图5的实施方式中,电极6被设置成使得因此形成的凝结区域18至少部分地重叠。
在此实施方式中,薄层绝缘8还被配置为两部分薄层。所述薄层包括薄层电绝缘涂层9以及电绝缘板7,薄层电绝缘涂层9在侧部区域13和后部区域15中围绕传导芯3,电绝缘板7设置在夹紧件表面12上并被电极6穿透。
参考标记
1 双极钳
2 夹紧件
3 传导芯
4 抓取区域
5 电极容纳部
6 电极
7 绝缘板
8 薄层绝缘
9 绝缘涂层
10 自由端
11 传导芯表面
12 夹紧件表面
13 夹紧件后部
14 中间空间
15 夹紧件侧部
16 凝结对
18 凝结区域
20 臂
22 铰接连接
24 致动装置
26 HF发生器
30 组织
Claims (13)
1.一种用于HF外科手术的双极钳,所述双极钳具有至少两个双极夹紧件(2),双极夹紧件能够相对于彼此在打开位置与凝结位置之间移动从而限定出抓取区域(4),并且双极夹紧件具有用于凝结被所述夹紧件(2)在抓取区域中抓取的组织的电极(6),其特征在于,
所述夹紧件(2)基本上整体包括电传导芯(3),所述电传导芯(3)由薄层电绝缘(8)围绕,其中,所述电极(6)被设置在电传导芯(3)上,并且被设置为针状电极并穿过所述薄层电绝缘(8)突出到所述抓取区域(4)中,其中,所述电极(6)彼此间隔开和偏移从而分别形成中间空间(14),使得在所述凝结位置一个夹紧件(2′)的电极(6″)至少部分地沉入由另一夹紧件(2)的电极(6、6′)所形成的中间空间(14)中,
其中,所述电极(6)的体积的总和小于所述电传导芯(3)的体积的总和,
其中,所述电极(6)被配置为与至少一个电传导芯(3)一体或被设置在位于至少一个电传导芯(3)上的互补的电极容纳部(5)中。
2.根据权利要求1所述的双极钳,其特征在于,所有电极(6)的热容量与所述电传导芯(3)的热容量的比被设计为如此小以使得在凝结过程中基本上防止所述夹紧件(2)的加热。
3.根据前述权利要求任一项所述的双极钳,其特征在于,电极(6)的表面积的总和小于所述夹紧件(2)的表面积的总和。
4.根据权利要求1所述的双极钳,其特征在于,电极(6)在其自由端具有平坦的形状,从而基本上防止所述电极穿入到在凝结位置被抓取的组织中。
5.根据权利要求1所述的双极钳,其特征在于,电极(6)呈圆柱形。
6.根据权利要求1所述的双极钳,其特征在于,电极(6)被设置在电传导芯(3)上并与所述夹紧件(2)的朝向所述抓取区域(4)的夹紧件表面(12)垂直。
7.根据权利要求1所述的双极钳,其特征在于,电极(6)被设置和配置以使得在所述凝结位置组织(3)被抓取的情况下,产生凝结区域(18)的电流在一个夹紧件(2)的形成中间空间(14)的电极(6、6′)与另一夹紧件(2′)的沉入该中间空间的电极(6″)之间流动。
8.根据权利要求7所述的双极钳,其特征在于,电极(6)彼此间隔开以使得在凝结过程中且在形成凝结对(16)的各自电极(6)之间所形成的所述凝结区域(18)至少部分地重叠。
9.根据权利要求1或7或8所述的双极钳,其特征在于,多个中间空间(14)被形成为基本上相同。
10.根据权利要求1所述的双极钳,其特征在于,薄层电绝缘(8)被配置为位于所述夹紧件表面(12)上的绝缘板(7)以及位于电传导芯表面(11)剩余部分上的绝缘涂层(9)。
11.根据权利要求1所述的双极钳,其特征在于,还包括臂(20),所述臂(20)通过铰接连接(22)相互连接并具有近侧致动装置(24),所述近侧致动装置(24)设置在所述臂(20)末端,用于打开和关闭夹紧件(2),其中,电极(6)均沿着圆形路径绕所述铰接连接(22)枢转,所述电极在夹紧件(2)打开和关闭过程中在所述圆形路径上移动。
12.根据权利要求11所述的双极钳,其特征在于,从至少一个电传导芯(3)突出的电极(6)的长度与距所述铰接连接(22)的距离成正比地增加。
13.一种用于HF外科手术的医疗器械,所述用于HF外科手术的医疗器械具有至少一个根据权利要求1-10任一项所述的双极钳(1)、通过铰接连接(22)彼此连接的至少两个臂(20)、以及用于打开和关闭夹紧件(2)的设置于臂(20)末端的近侧致动装置(24)。
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EP2291133A1 (de) | 2011-03-09 |
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PL2291133T3 (pl) | 2015-02-27 |
WO2009127314A1 (de) | 2009-10-22 |
CN102006832A (zh) | 2011-04-06 |
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