CN104173105A - 一种新型消融双极针 - Google Patents

一种新型消融双极针 Download PDF

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CN104173105A
CN104173105A CN201410480241.0A CN201410480241A CN104173105A CN 104173105 A CN104173105 A CN 104173105A CN 201410480241 A CN201410480241 A CN 201410480241A CN 104173105 A CN104173105 A CN 104173105A
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insulation layer
syringe needle
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陈志明
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Anjun Medical Science & Technology (nanjing) Co Ltd
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Priority to US14/711,953 priority patent/US20160081741A1/en
Priority to PCT/CN2015/079009 priority patent/WO2016041370A1/en
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • A61B18/1477Needle-like probes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053Mechanical features of the instrument of device
    • A61B2018/00059Material properties
    • A61B2018/00071Electrical conductivity
    • A61B2018/00083Electrical conductivity low, i.e. electrically insulating
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053Mechanical features of the instrument of device
    • A61B2018/00107Coatings on the energy applicator
    • A61B2018/00136Coatings on the energy applicator with polymer
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00577Ablation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • A61B2018/1405Electrodes having a specific shape
    • A61B2018/1425Needle

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  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Molecular Biology (AREA)
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  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

一种新型消融双极针,其特征是包括针杆(1)、针头(2)、内绝缘套管(3)、电极套管(4)、外绝缘套管(5)、隔离绝缘层(6)和第一PTC套管(7),所述针头(2)与针杆(1)为一整体,针头(2)设置在针杆(1)一端直径较大并呈尖锐状,针杆(1)上紧靠针头(2)的位置套设有隔离绝缘层(6),隔离绝缘层(6)一侧的针杆(1)上依次设有内绝缘套管(3)、电极套管(4)和外绝缘套管(5),隔离绝缘层(6)另一侧的针头(2)上设有第一PTC套管(7)。本新型消融双极针利用PTC热敏电阻的这一特性,实现凝固组织时,消融针不粘黏,不引起再次出血的并发症等风险。

Description

一种新型消融双极针
技术领域
本发明涉及医疗仪器技术领域,尤其是一种新型消融双极针。
背景技术
射频消融(RFA)是一种微创介入治疗方法,1990年Rossi和Mc gahan等最先报道RFA应用于动物肝脏组织的消融,随后用这一技术治疗人类的肝脏肿瘤。目前,RFA技术已被广泛应用于治疗全身多种器官的疾病,除了可以灭活肿瘤,还能减少瘤负荷达到止痛、降低激素分泌等目的,此外还有研究将其应用于非肿瘤疾病如治疗脾功能亢进(脾亢)等。RFA是一种肿瘤热疗方法,其基本原理是利用热能损毁肿瘤组织,由电极发出射频波使其周围组织中的离子和极性大分子振荡撞击摩擦发热,将肿瘤区加热至有效治疗温度范围并维持一定时间以杀灭肿瘤细胞。同时,射频热效应能使周围组织的血管凝固,形成一个反应带,使之不能向肿瘤供血而防止肿瘤转移。
对于消融程度的控制,现有的射频消融技术通常采用阻抗控制好温度控制两种方式。
阻抗控制采用400-500欧姆的阻抗,但是具体阻抗难以灵活调整,阻抗过小会导致提前结束消融,消融不彻底,阻抗过大,又容易导致组织粘黏。
温度控制通常设置105摄氏度为温度阀值,容易导致局部消融程度不均匀。
PTC热敏电阻是一种典型具有温度敏感性的半导体电阻,超过一定的温度时,它的电阻值随着温度的升高呈阶跃性的增高,PTC是PositiveTemperatureCoefficient的缩写,意思是正的温度系数,泛指正温度系数很大的半导体材料或元器件。通常我们提到的PTC是指正温度系数热敏电阻,简称PTC热敏电阻。正温度系数热敏电阻其电阻值随着PTC热敏电阻本体温度的升高呈现出阶跃性的增加,温度越高,电阻值越大。
本发明将利用PTC热敏电阻的特性,设计一种智能控制的新型消融双极针。
发明内容
本发明的目的在于提供一种新型消融双极针,利用PTC热敏电阻的特性以克服阻抗控制和温度控制的弊端。
本发明的技术方案是:
一种新型消融双极针,包括针杆1、针头2、内绝缘套管3、电极套管4、外绝缘套管5、隔离绝缘层6和第一PTC套管7,所述针头2与针杆1为一整体,针头2设置在针杆1一端直径较大并呈尖锐状,针杆1上紧靠针头2的位置套设有隔离绝缘层6,隔离绝缘层6一侧的针杆1上依次设有内绝缘套管3、电极套管4和外绝缘套管5,隔离绝缘层6另一侧的针头2上设有第一PTC套管7。
所述隔离绝缘层6另一侧的针头2上设有直径小于针头2最粗直径的第一台阶槽9,第一PTC套管7设置在第一台阶槽9内。
所述隔离绝缘层6一侧的电极套管4上还设有第二PTC套管8。
所述隔离绝缘层6一侧的电极套管4上设有直径小于电极套管4最粗直径的第二台阶槽10,第二PTC套管8设置在第二台阶槽10内。
所述隔离绝缘层6的材质为聚四氟乙烯(PTFE)。
所述针杆1和/或针头2的材质为医用304不锈钢材料。
所述外绝缘套管5和/或内绝缘套管3的材质为特氟龙。
所述针头2尖端的角度为10°-20°。优选为14.5°
本发明的有益效果是:
本发明的新型消融双极针利用PTC热敏电阻的这一特性,配合射频发生器,将其设计为用来加热处理有针对性的目标生物组织。热处理温度范围,例如约90℃至100℃,从而实现凝固组织时,消融针不粘黏,不引起再次出血的并发症等风险。
本发明的新型消融双极针利用PTC热敏电阻温度越高,电阻值越大的特性,加上本发明的PTC热敏电阻分布在消融的全部区域,不同于现有的整体通断,本发明可实现局部通断,直到消融区域的所有组织都达到预定的消融温度,实现消融的精确控制,使得全部目标靶位均可以达到完全彻底的消融效果。而且,一旦消融区域的组织达到预定温度,就自动断开,不会对组织造成过度伤害。
附图说明
图1是本发明的剖视结构示意图。
图2是图1中I的局部结构放大示意图。
图中:1为针杆、2为针头、3为内绝缘套管、4为电极套管、5为外绝缘套管、6为隔离绝缘层、7为第一PTC套管、8为第二PTC套管、9为第一台阶槽、10为第二台阶槽。
具体实施方式
下面结合附图对本发明作进一步描述:
如图1、图2,一种新型消融双极针,包括针杆1、针头2、内绝缘套管3、电极套管4、外绝缘套管5、隔离绝缘层6和第一PTC套管7,所述针头2与针杆1为一整体,针头2设置在针杆1一端直径较大并呈尖锐状,针杆1上紧靠针头2的位置套设有隔离绝缘层6,隔离绝缘层6一侧的针杆1上依次设有内绝缘套管3、电极套管4和外绝缘套管5,隔离绝缘层6另一侧的针头2上设有第一PTC套管7。
隔离绝缘层6另一侧的针头2上设有直径小于针头2最粗直径的第一台阶槽9,第一PTC套管7设置在第一台阶槽9内。
隔离绝缘层6一侧的电极套管4上还设有第二PTC套管8。
隔离绝缘层6一侧的电极套管4上设有直径小于电极套管4最粗直径的第二台阶槽10,第二PTC套管8设置在第二台阶槽10内。
隔离绝缘层6的材质为聚四氟乙烯(PTFE)。
针杆1和/或针头2的材质为医用304不锈钢材料。
外绝缘套管5和/或内绝缘套管3的材质为特氟龙。
针头2尖端的角度为10°-20°。优选为14.5°
上面所述的实施例仅仅是对本发明的优选实施方式进行描述,并非对本发明的构思和范围进行限定,在不脱离本发明设计构思前提下,本领域中普通工程技术人员对本发明的技术方案作出的各种变型和改进,均应落入本发明的保护范围,本发明请求保护的技术内容已经全部记载在权利要求书中。

Claims (8)

1.一种新型消融双极针,其特征是包括针杆(1)、针头(2)、内绝缘套管(3)、电极套管(4)、外绝缘套管(5)、隔离绝缘层(6)和第一PTC套管(7),所述针头(2)与针杆(1)为一整体,针头(2)设置在针杆(1)一端直径较大并呈尖锐状,针杆(1)上紧靠针头(2)的位置套设有隔离绝缘层(6),隔离绝缘层(6)一侧的针杆(1)上依次设有内绝缘套管(3)、电极套管(4)和外绝缘套管(5),隔离绝缘层(6)另一侧的针头(2)上设有第一PTC套管(7)。 
2.根据权利要求1所述的一种新型消融双极针,其特征在于所述隔离绝缘层(6)另一侧的针头(2)上设有直径小于针头(2)最粗直径的第一台阶槽(9),第一PTC套管(7)设置在第一台阶槽(9)内。 
3.根据权利要求1所述的一种新型消融双极针,其特征在于所述隔离绝缘层(6)一侧的电极套管(4)上还设有第二PTC套管(8)。 
4.根据权利要求3所述的一种新型消融双极针,其特征在于所述隔离绝缘层(6)一侧的电极套管(4)上设有直径小于电极套管(4)最粗直径的第二台阶槽(10),第二PTC套管(8)设置在第二台阶槽(10)内。 
5.根据权利要求1所述的一种新型消融双极针,其特征在于所述隔离绝缘层(6)的材质为聚四氟乙烯(PTFE)。 
6.根据权利要求1所述的一种新型消融双极针,其特征在于所述针杆(1)和/或针头(2)的材质为医用304不锈钢材料。 
7.根据权利要求1所述的一种新型消融双极针,其特征在于所述外绝缘套管(5)和/或内绝缘套管(3)的材质为特氟龙。 
8.根据权利要求1所述的一种新型消融双极针,其特征在于所述针头(2)尖端的角度为10°-20°。优选为14.5°。 
CN201410480241.0A 2014-09-18 2014-09-18 一种新型消融双极针 Pending CN104173105A (zh)

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