CN108030549B - 一种单边微波消融针 - Google Patents
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Abstract
本发明提供了一种单边微波消融针,包括消融针管和消融针头,所述消融针管内设有微波同轴电缆,消融针头内设有天线,微波同轴电缆连接到天线,所述微波同轴电缆的外圈设有金属转接罩,所述天线的外圈设有用于调整微波方向的调节件。所述微波同轴电缆包括内芯、介质层和电缆外层,微波同轴电缆靠近消融针头一端的内芯和介质层穿过所述金属转接罩,内芯连接到天线,弧形金属片与金属转接罩固定连接。
Description
技术领域
本发明涉及医疗器材领域,特别是一种单边微波消融针。
背景技术
微波消融治疗是一种对肿瘤组织具有高效、快速、均匀加热、热凝固彻底、使用方便、安全的治疗方法,多年来已广泛应用于临床。随着临床的的不断深入,临床对于微波消融针(微波辐射天线)的要求也越来越高。在现有技术中,仅有根据肿瘤组织的形态选取不同长度的消融针头进行消融治疗,且对于不呈圆形或不呈近似椭圆的细长形肿瘤,要用多根微波消融针分时分段进行治疗。
发明内容
发明目的:本发明所要解决的技术问题是针对现有技术的不足,提供一种单边微波消融针。
为了解决上述技术问题,本发明提供了一种单边微波消融针,包括消融针管和消融针头,所述消融针管内设有微波同轴电缆,消融针头内设有天线,微波同轴电缆连接到天线,所述微波同轴电缆的外圈设有金属转接罩,所述天线的外圈设有用于调整微波方向的调节件。
本发明中,所述微波同轴电缆包括内芯、介质层和电缆外层,微波同轴电缆靠近消融针头一端的内芯和介质层穿过所述金属转接罩,内芯连接到天线,弧形金属片与金属转接罩固定连接。
本发明中,所述金属转接罩内部为用于穿过微波同轴电缆最前端的内芯和介质层的通孔,通孔的孔径与消融针头、内芯和介质层形成阻抗匹配。
本发明中,所述消融针头为前端的针尖部分和后端的圆柱部分,圆柱部分内部设有天线孔,圆柱部分外圈设有单边槽,天线设置在天线孔内,调节件设置在单边槽上。
本发明中,所述调节件为一金属片。
本发明中,所述消融针管的末端设有把手,把手处设有与微波同轴电缆相连的同轴电缆连接头。
本发明中,所述把手内设有端封,端封上设有温度传感器,把手下部设有用于连接温度传感器的连接端子。
本发明中,所述把手下还设有进水软管,进水软管连接毛细管,毛细管延伸到消融针管前端,毛细管前端设有出水口,冷却水从出水口流出并在消融针管内回流到把手内,冷却水通过出水软管流出。
本发明中,金属转接罩的尺寸满足:
D为金属转接罩通孔的孔径,d为同轴电缆的内芯直径,ε为介质层的介电常数;
金属转接罩的外径长度为0.5~1倍天线的长度。
有益效果:本发明提供一种单边微波消融针,其单边定向微波发射功能专门对细长形状的肿瘤进行治疗,减少了用针次数和治疗时长。
附图说明
下面结合附图和具体实施方式对本发明做更进一步的具体说明,本发明的上述或其他方面的优点将会变得更加清楚。
图1是消融针的整体剖面示意图;
图2是图1A处局部放大图;
图3是图2中B-B’处横截面示意图;
图4针头部分爆炸示意图。
具体实施方式
下面将结合附图对本发明作详细说明。
实施例:
如图1,本实施例提供的一种单边微波消融针,包括消融针头1、转接金属罩3、消融针管11和把手12,在消融针头1与消融针管11的一端之间设有转接金属罩3,消融针管11的后端与把手12的头部连接,消融针管11的前端与转接金属罩3相接,在把手12的尾部设有固定架和用于外部连接的插口,在把手12尾部的固定架上设有同轴电缆连接头9及用于连接温度传感器的第一连接端子6a和第二连接端子6b,消融针管11内设有用于连接消融针头1的微波同轴电缆2和进水用不锈钢毛细管4,微波同轴电缆另一端与把手12下部固定架上的同轴电缆连接头9连接,在端封10上设有温度传感器6c,在把手12下部的固定架上设有用于连接温度传感器的第一连接端子6a和第二连接端子6b,进水软管8b与把手12尾部固定架上的进水口7b一端相连,进水口7b另一端与进水用不锈钢毛细管4连通,水从出水口4a流出,在消融针管11内部空间流回到出水口7a端,出水口7a另一端与出水软管8a相连。
如图2、图3和图4,消融针管11内的微波同轴电缆前端与金属转接罩后端面3a焊接,微波同轴电缆伸出的内芯2a和介质层2b穿过金属转接罩3后,内芯2a与消融针头内部的天线1b相焊接,弧形金属片1c设置在消融针头的外圈,弧形金属片1c与转接金属罩的前端面3b相焊接,金属转接罩内部通孔的孔径经过阻抗匹配设计,实现了微波同轴电缆内芯2a、介质层2b、消融针头1三者间的阻抗匹配,同时达到了微波同轴电缆和消融针头的机械连接可靠性设计。
金属转接罩后端面3a处设有凸缘,便于焊接,且增加与消融针管的连接机械强度。
介质层2b外圈、金属转接罩前端设有挡块13,避免在加工时发生短路,同时提高微波同轴电缆内芯2a与金属转接罩3的耐压强度。
消融针管11的最外层部分5采用不锈钢管设计,端封10四周采用金属材料设计,上述进水口7b、出水口7a、第一连接端子6a、第二连接端子6b和同轴电缆连接头9都设在端封10下方,上述温度传感器采用热敏电阻。微波能量经同轴电缆连接头9传到消融针头1进行单边定向区域发射,达到只治疗单边的效果,冷却水经进水管8b流入消融针杆11内的不锈钢毛细管4,再流回至出水口7a后由出水管8a流出。保证消融针杆温度不能太高的要求。
消融针头通过运用定向天线设计原理,进行一体化结构设计,采用低温共烧陶瓷(Low Temperature Co-fired Ceramic LTCC)整合组件技术将定向天线1b和弧形金属片1c加工在陶瓷介质1a上制造而成,通过一个参与阻抗匹配的金属转接罩与微波同轴电缆输出端实现转接。
设同轴线外导体的内径是D,内导体的直径是d,其中填充介质的介电常数是ε:则同轴线的特性阻为
同轴线的特性阻抗常做成30Ω、50Ω、70Ω等几种,为了兼顾功率大与衰减减小两方面的要求,选用50Ω。
本发明的金属转接罩的通孔的孔径即D,同轴电缆的内芯为d、介质层的介电常数是ε。
考虑到机械强度,金属转接罩的长度大概在5mm~10mm,本实施例中金属转接罩的长度为10mm;外径有技术要求,大约0.5~1倍1b的长度;内孔径有技术要求,与同轴电缆外导体的内径适配。改善定向天线的输入驻波和定向增益。
λ为微波频率对应的波长,天线1b长度为近似于λ/8、λ/16、λ/32,调节件1c长度近似为天线1b长度的1.2~1.4倍,厚度为1盎司敷铜的厚度,该尺寸设计有利于提高定向天线的输入驻波和定向增益。
本发明提供了一种单边微波消融针,具体实现该技术方案的方法和途径很多,以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。本实施例中未明确的各组成部分均可用现有技术加以实现。
Claims (5)
1.一种单边微波消融针,其特征在于,包括消融针管(11)和消融针头(1),所述消融针管(11)内设有微波同轴电缆,消融针头(1)内设有天线(1b),微波同轴电缆连接到天线(1b),所述微波同轴电缆的外圈设有金属转接罩(3),所述天线(1b)的外圈设有用于调整微波方向的调节件(1c);
所述微波同轴电缆包括内芯(2a)、介质层(2b)和电缆外层(2c),微波同轴电缆靠近消融针头(1)一端的内芯和介质层穿过所述金属转接罩(3),内芯连接到天线(1b),调节件(1c)与金属转接罩(3)固定连接;
所述金属转接罩内部为用于穿过微波同轴电缆最前端的内芯和介质层的通孔,通孔的孔径与消融针头、内芯和介质层形成阻抗匹配;
金属转接罩(3)的尺寸满足:
D为金属转接罩通孔的孔径,d为同轴电缆的内芯直径,ε为介质层的介电常数;
金属转接罩的外径长度为0.5~1倍天线(1b)的长度;
所述消融针管的末端设有把手(12),把手(12)处设有与微波同轴电缆相连的同轴电缆连接头(9)。
2.根据权利要求1所述的一种单边微波消融针,其特征在于,所述消融针头(1)为前端的针尖部分和后端的圆柱部分,圆柱部分内部设有天线孔,圆柱部分外圈设有单边槽,天线(1b)设置在天线孔内,调节件(1c)设置在单边槽上。
3.根据权利要求2所述的一种单边微波消融针,其特征在于,所述调节件(1c)为一金属片。
4.根据权利要求3所述的一种单边微波消融针,其特征在于,所述把手内设有端封,端封上设有温度传感器,把手下部设有一个以上用于连接温度传感器的连接端子。
5.根据权利要求4所述的一种单边微波消融针,其特征在于,所述把手下还设有进水软管(8b),进水软管(8b)连接毛细管(4),毛细管(4)延伸到消融针管(11)前端,毛细管(4)前端设有出水口(4a),冷却水从出水口流出并在消融针管内回流到把手内,冷却水通过出水软管(8a)流出。
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