WO2005102197A1 - 超音波処置具 - Google Patents

超音波処置具 Download PDF

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Publication number
WO2005102197A1
WO2005102197A1 PCT/JP2004/016877 JP2004016877W WO2005102197A1 WO 2005102197 A1 WO2005102197 A1 WO 2005102197A1 JP 2004016877 W JP2004016877 W JP 2004016877W WO 2005102197 A1 WO2005102197 A1 WO 2005102197A1
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WO
WIPO (PCT)
Prior art keywords
ultrasonic
treatment
ultrasonic wave
vibration
treatment section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2004/016877
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English (en)
French (fr)
Inventor
Norihiro Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Corp
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Filing date
Publication date
Application filed by Olympus Corp filed Critical Olympus Corp
Priority to EP04821907A priority Critical patent/EP1738703A4/en
Publication of WO2005102197A1 publication Critical patent/WO2005102197A1/ja
Priority to US11/474,843 priority patent/US20060247558A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/32Surgical cutting instruments
    • A61B17/320068Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
    • A61B17/320092Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2901Details of shaft
    • A61B2017/2902Details of shaft characterized by features of the actuating rod
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/32Surgical cutting instruments
    • A61B17/320068Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
    • A61B2017/320088Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with acoustic insulation, e.g. elements for damping vibrations between horn and surrounding sheath

Definitions

  • the present invention relates to an ultrasonic treatment device.
  • an ultrasonic treatment instrument that dissects (excises) a living tissue using ultrasonic vibration and coagulates a dissected or other treatment unit.
  • a treatment section at the tip of a probe that transmits ultrasonic vibration is formed in a loop or rod shape, and the loop or rod treatment section performs ultrasonic treatment on a living tissue.
  • Patent Document 1 US Pat. No. 6,231,578
  • Patent Document 2 US Pat. No. 5,649,935
  • a so-called flexible endoscope in which an insertion portion to be inserted into a body cavity is configured to be freely bent is a super endoscope using a flexible probe that bends freely according to the bending of the insertion portion.
  • a sonic treatment device is used.
  • the flexible probe refers to a probe having a characteristic of being returned to a substantially original shape by elastic deformation when bent by 90 ° or more.
  • a conventional ultrasonic treatment instrument using such a flexible probe cannot perform ultrasonic treatment with a living tissue interposed therebetween because there is no forceps provided at the tip of the probe. It is desired to provide a functional ultrasonic treatment tool! /
  • the present invention has been made in view of the above, and has as its object to provide an ultrasonic treatment tool using a flexible probe capable of performing an ultrasonic treatment with a living tissue interposed therebetween. Means for solving the problem
  • an ultrasonic treatment instrument transmits an ultrasonic wave generated by an ultrasonic generation unit to a distal end of a flexible transmission member.
  • Super An ultrasonic treatment tool for performing sonic treatment wherein a treatment section is provided at a tip of the transmission member, the treatment section is engaged with the treatment section to grasp a living tissue, and a grasping member opened and closed by an operation wire is treated.
  • the treatment section has a length of approximately 1Z2 of the wavelength of the ultrasonic wave, and the distal end becomes an antinode in the vibration of the ultrasonic wave, and has a cross-sectional area in a plane orthogonal to a transmission direction of the ultrasonic wave.
  • Rigidity is provided by making the transmission member larger than the transmission member, the gripping member is engaged with the treatment section at a node position in the vibration of the ultrasonic wave, and the operation wire has one end connected to the gripping member, The other end is connected to the operating member and operated by the operating member.
  • the living tissue is sandwiched between the forceps and the treatment section having rigidity, and the ultrasonic wave transmitted through the flexible transmission member is applied to the living tissue by the ultrasonic waves. Sonic treatment is applied.
  • an ultrasonic treatment instrument is characterized in that, in the above invention, the transmission member is covered by a sheath.
  • the transmission member is provided with a vibration-proof member that contacts the inner surface of the sheath at a node position in the ultrasonic vibration. It is characterized by having been done.
  • the ultrasonic treatment device that is effective in the present invention has an effect that ultrasonic treatment can be performed with the grasping member and the treatment unit sandwiching the living tissue because the treatment unit has rigidity. .
  • FIG. 1 is a cross-sectional view showing a schematic configuration of an ultrasonic treatment tool according to the present invention, partially cut away.
  • FIG. 2 is a perspective view showing a treatment section, forceps, and operation wires at the distal end of the ultrasonic treatment instrument in FIG.
  • FIG. 3 is a bottom view showing FIG. 2 partially in section.
  • FIG. 41 is a cross-sectional view showing a first modified example in which a forceps is supported on a treatment section so that the forceps can be opened and closed.
  • FIG. 42 is a cross-sectional view showing a second modified example in which a forceps is supported on a treatment section so as to be freely opened and closed.
  • FIG. 5 is a cross-sectional view of relevant parts showing a modification of the ultrasonic treatment device shown in FIG. 1.
  • FIG. 6 is a diagram showing an example of how to attach a vibration isolating member to be attached to a flexible probe.
  • FIG. 7 is a perspective view showing another mounting method of the vibration isolating member to be attached to the flexible probe, and showing a shape of a concave portion for attaching the vibration isolating member.
  • FIG. 8 is a perspective view showing still another manner of attaching a vibration isolator to be attached to a flexible probe.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of the ultrasonic treatment device according to the present invention, partially cut away.
  • FIG. 2 is a perspective view showing a treatment section, forceps, and operation wires at the distal end of the ultrasonic treatment tool in FIG.
  • FIG. 3 is a bottom view partially showing FIG. 2 in section.
  • the ultrasonic treatment instrument 1 includes an ultrasonic vibrator unit 2, a long flexible probe 3, forceps 5, and an operation unit 9.
  • the ultrasonic transducer unit 2 is a bolted Langevin-type transducer having a horn 2a, attached to a support member 8, and connected to a power supply by a power cable 2b. .
  • an ultrasonic vibrator 2d and a horn 2a housed in a casing 2e are fixed to the casing 2e by a flange 2c.
  • a foot switch is provided between the power cable 2b and the power source, and the power of the ultrasonic treatment instrument 1 is turned on / off by the foot switch.
  • the flexible probe 3 is a transmission member having one end connected to the ultrasonic vibrator 2d and having flexibility for transmitting ultrasonic waves emitted from the ultrasonic vibrator 2d.
  • metals such as titanium alloys, nickel alloys, stainless steel, duralumin, and quartz fibers are used.
  • the flexible probe 3 is provided with a treatment section 3a at the other end.
  • the flexible probe 3 has such flexibility that, for example, when it is bent by 90 ° or more, it returns to a substantially original shape by elastic deformation.
  • the treatment section 3a is provided at the distal end of the flexible probe 3 via a tapered transition section 3b, as shown in Figs. 2 and 3, and the ultrasonic wave (2) emitted by the ultrasonic transducer 2d is provided. (See the dotted line in FIG. 3)
  • the wavelength ( ⁇ ) is approximately 2 and the tip is set to be the antinode in the ultrasonic vibration.
  • the treatment section 3a has a greater rigidity than the flexible probe 3 by making the sectional area in a plane orthogonal to the ultrasonic transmission direction larger than the sectional area of the flexible probe 3. Is given.
  • the treatment section 3a is inserted into the cover member 4, and the distal end of the treatment section 3a also extends to four cover members.
  • the treatment section 3a is provided with a rigidity that does not bend even when a living tissue is sandwiched between the treatment section 3a and the forceps 5.
  • the treatment section 3a is set to be larger than the cross-sectional area of the flexible probe 3, the attenuation rate of the amplitude increases as the transition section 3b approaches the node position in the ultrasonic vibration. For this reason, as shown in FIG. 3, the transition portion 3b is provided at the antinode of the ultrasonic vibration (see the dotted line in FIG. 3) to minimize the amplitude attenuation rate.
  • the treatment section 3a is larger than the cross-sectional area of the flexible probe 3.
  • the cross-sectional area of the flexible probe 3 compared to the general value (10-30) of the ratio of the cross-sectional area of the ultrasonic transducer 2d with respect to the cross-sectional area of the flexible probe 3, the cross-sectional area of the flexible probe 3 relative to the cross-sectional area Sp The ratio is as small as 1.3 ⁇ StZSp ⁇ 8. Therefore, the flexible probe 3 does not significantly affect the amplitude attenuation rate even if the treatment section 3a is provided.
  • a forceps 5 that engages with the treatment section 3a and grips a living tissue is openably and freely attached to a node position in the ultrasonic vibration.
  • the cover member 4 is a substantially cylindrical member, as shown in FIGS. 2 and 3, having mutually parallel mounting surfaces 4a for mounting forceps 5 on both ends thereof, and a cylindrical portion 4b formed at the rear. Therefore, an opening 4c for feeding out the operation wire 6 is formed between the mounting surface 4a and the mounting surface 4a.
  • the cover member 4 has one end of a sheath 7 connected to the cylindrical portion 4b. The other end of the sheath 7 is connected to the support member 8 and covers the flexible probe 3 and the operation wire 6.
  • the forceps 5 have a pin 5c by an operation unit 9 via an operation wire 6 having one end connected to the forceps 5 and the other end connected to an operation box 9. It is opened and closed around (see arrow in Fig. 1).
  • the forceps 5 is provided with connecting arms 5b extending rearward on both sides of a rear portion of the main body 5a engaged with the treatment section 3a.
  • the forceps 5 has two connecting arms 5b abutting on the mounting surface 4a, and each connecting arm 5b is connected to the treatment section 3a by a pin 5c attached to a node position in ultrasonic vibration (see FIG. 3).
  • the forceps 5 since the forceps 5 is connected to the treatment section 3a at the nodal position, it is not affected by the ultrasonic vibration of the treatment section 3a.
  • the pin 5c may be attached through the treatment section 3a as shown in FIG. Good.
  • a projection 3d instead of the pin 5c, may be provided at a node position in the ultrasonic vibration of the treatment section 3a, and the forceps 5 may be supported by the treatment section 3a so as to be freely opened and closed by the projection 3d. .
  • one end of the operation wire 6 is branched into two, and each of the branched distal end portions S is connected to a wire pin 6a attached to a rear portion of the two connection arms 5b. .
  • the other end of the operation wire 6 is connected to the movable handle 9c of the operation unit 9.
  • the operation unit 9 has a support cylinder 9a attached to the support member 8, two guide members 9b, a movable handle 9c, and a fixed handle 9d.
  • the support tube 9a guides the operation wire 6 inserted inside to the movable handle 9c.
  • the guide member 9b guides the movable handle 9c slidably along the operation wire 6.
  • the movable handle 9c is a plate-shaped member to which the operation wire 6 is connected.Finger holes 9e are provided on both sides, and the movable handle 9c is moved in the direction of the arrow along the guide member 9b in FIG. Open and close forceps 5.
  • the fixing pin 9d is attached to the rear end of the guide member 9b, and has a finger hole 9f.
  • the ultrasonic treatment instrument 1 configured as described above is inserted into, for example, a channel of an endoscope, and the treatment section 3a and the forceps 5 are protruded from the distal end or directly inserted into a body cavity. used.
  • the ultrasonic treatment tool 1 pulls the movable handle 9c toward the fixed handle 9d, and rotates the forceps 5 counterclockwise around the pin 5c via the operating wire 6 in FIG. Then, the forceps 5 are inserted into the channel or the like in a closed state engaged with the treatment section 3a.
  • the movable handle 9c is pushed out of the fixed handle 9d.
  • the forceps 5 is rotated clockwise around the pin 5c via the operation wire 6, and is brought into the open state in which the engagement with the treatment section 3a is released.
  • the inside of the body cavity is observed with the endoscope.
  • the forceps 5 are closed again by operating the movable handle 9c, and the living tissue at a desired location is sandwiched between the treatment section 3a and the forceps 5, and an ultrasonic treatment is performed.
  • the treatment section 3a is given high rigidity by making the cross-sectional area larger than the cross-sectional area of the flexible probe 3.
  • the ultrasonic treatment instrument 1 ensures that the treatment section 3a is provided with high rigidity, so that the living tissue can be reliably grasped by the treatment section 3a and the forceps 5. It can be grasped and subjected to ultrasonic treatment.
  • the treatment section 3a has a length of approximately 1Z2 of the wavelength of the ultrasonic wave transmitted through the flexible probe 3, and the distal end of the treatment section 3a is It is set to be the belly of. For this reason, when the living body tissue is grasped by the treatment section 3a and the forceps 5, the ultrasonic treatment instrument 1 can most efficiently perform ultrasonic treatment on the grasped living tissue.
  • the ultrasonic treatment instrument 1 covers the flexible probe 3 with the inner sheath 11 and, at the node position in the ultrasonic vibration (see the dotted line) of the flexible probe 3, An anti-vibration member 12 that contacts the inner surface of the inner sheath 11 may be provided.
  • the ultrasonic treatment instrument 1 separates the flexible probe 3 and the operation wire 6 that moves in the left and right direction in the figure by opening and closing the forceps 5 by the inner sheath 11. Therefore, the flexible probe 3 and the operation wire 6 are prevented from being entangled in the sheath 7 due to interference.
  • the vibration isolating member 12 when the vibration isolating member 12 is provided on the flexible probe 3, noise vibration generated in the flexible probe 3 due to the vibration of the ultrasonic wave transmitted to the flexible probe 3 is suppressed, Ultrasonic vibration can be transmitted stably.
  • the vibration isolating member 12 is made of a heat-resistant material such as fluororesin, polyimide, rubber or the like, and a concave portion formed in the flexible probe 3 in the circumferential direction as shown in FIG. Attach to 3c.
  • the anti-vibration member 12 has a concave portion 3 c formed in the flexible probe 3 in a circumferential direction, and has a longitudinal shape extending along the longitudinal direction of the flexible probe 3.
  • a groove may be attached to this groove to provide a range of several mm before and after including the node position of the ultrasonic vibration.
  • the vibration isolating member may be provided on the outer periphery of the flexible probe 3 at intervals in the circumferential direction, like the vibration isolating member 13 shown in FIG.
  • the ultrasonic treatment device of the present invention is useful for an ultrasonic treatment device using a flexible probe, because the treatment section has rigidity.

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Abstract

 可撓性を有する伝達部材(3)の先端へ超音波発生手段(2)が発生した超音波を伝達し、超音波処置を施す超音波処置具(1)。伝達部材の先端に処置部(3a)を設けると共に、処置部と係合して生体組織を把持し、操作ワイヤ(6)によって開閉される把持部材(5)を処置部に設け、処置部(3a)は、超音波の波長の略1/2の長さを有し、先端が超音波の振動における腹となり、超音波の伝達方向に直交する面における断面積を伝達部材(3)よりも大きくして剛性が付与され、把持部材(5)は、超音波の振動における節位置において処置部と係合され、操作ワイヤ(6)は、一端が把持部材に連結され、他端が操作部材に連結されて操作部材(9)によって操作される。

Description

超音波処置具
技術分野
[0001] 本発明は、超音波処置具に関するものである。
背景技術
[0002] 従来、超音波振動を利用して生体組織を切開 (切除)すると共に、切開等をした処 置部を凝固させる超音波処置具が知られている。このような超音波処置具は、例えば 、超音波振動を伝達するプローブ先端の処置部がループ状或いは棒状に成形され 、このループ状或いは棒状の処置部によって生体組織に超音波処置を施して ヽた( 例えば、特許文献 1, 2参照)。
[0003] 特許文献 1:米国特許第 6231578号明細書
特許文献 2:米国特許第 5649935号明細書
発明の開示
発明が解決しょうとする課題
[0004] ところで、体腔内へ挿入される挿入部が湾曲自在に構成されたいわゆる軟性内視 鏡にぉ 、ては、挿入部の湾曲に対応して自在に曲がる可撓性プローブを用いた超 音波処置具が使用されている。ここで、可撓性プローブとは、例えば、 90° 以上曲げ たときに、弾性変形によって略元の形に戻る特性を有するプローブを言う。このような 可撓性プローブを用いた従来の超音波処置具は、プローブ先端に鉗子を設けたも のがないことから、生体組織を挟んで超音波処置を施すことができず、このような機 能を有した超音波処置具の提供が望まれて!/、た。
[0005] 本発明は、上記に鑑みてなされたものであって、生体組織を挟んで超音波処置を 施すことができる可撓性プローブを用いた超音波処置具を提供することを目的とする 課題を解決するための手段
[0006] 上述した課題を解決し、目的を達成するために、請求項 1に係る超音波処置具は、 可撓性を有する伝達部材の先端へ超音波発生手段が発生した超音波を伝達し、超 音波処置を施す超音波処置具であって、前記伝達部材の先端に処置部を設けると 共に、前記処置部と係合して生体組織を把持し、操作ワイヤによって開閉される把持 部材を前記処置部に設け、前記処置部は、前記超音波の波長の略 1Z2の長さを有 し、先端が前記超音波の振動における腹となり、前記超音波の伝達方向に直交する 面における断面積を前記伝達部材よりも大きくして剛性が付与され、前記把持部材 は、前記超音波の振動における節位置において前記処置部と係合され、前記操作ヮ ィャは、一端が前記把持部材に連結され、他端が操作部材に連結されて前記操作 部材によって操作されることを特徴とする。
[0007] 請求項 1の超音波処置具によれば、鉗子と剛性が付与された処置部とによって生 体組織を挟み、可撓性の伝達部材を伝達されてくる超音波によって生体組織に超音 波処置が施される。
[0008] また、請求項 2に係る超音波処置具は、上記の発明にお 、て、前記伝達部材は、 シースによって覆われて 、ることを特徴とする。
[0009] また、請求項 3に係る超音波処置具は、上記の発明にお 、て、前記伝達部材は、 前記超音波の振動における節位置に、前記シース内面と当接する防振部材が設け られていることを特徴とする。
発明の効果
[0010] 本発明に力かる超音波処置具は、処置部に剛性が付与されているので、把持部材 と処置部とによって生体組織を挟んで超音波処置を施すことができるという効果を奏 する。
図面の簡単な説明
[0011] [図 1]図 1は、本発明にかかる超音波処置具の概略構成を一部破断して示す断面図 である。
[図 2]図 2は、図 1の超音波処置具先端の処置部,鉗子及び操作ワイヤを示す斜視 図である。
[図 3]図 3は、図 2を部分的に断面にして示した底面図である。
圆 4-1]図 4 1は、処置部に鉗子を開閉自在に支持する第 1の変形例を示す断面図 である。 [図 4-2]図 4 2は、処置部に鉗子を開閉自在に支持する第 2の変形例を示す断面図 である。
[図 5]図 5は、図 1に示す超音波処置具における変形例を示す要部断面図である。
[図 6]図 6は、可撓性プローブへ取り付ける防振部材の取付け方の一例を示す図であ る。
[図 7]図 7は、可撓性プローブへ取り付ける防振部材の他の取付け方を示すもので、 防振部材を取り付ける凹部の形状を示す斜視図である。
[図 8]図 8は、可撓性プローブへ取り付ける防振部材の更に他の取付け方を示す斜 視図である。
符号の説明
1 超音波処置
2 超音波振動子ユニット
3 可撓性プローブ
3a 処置部
3b 移行部
4 カバー部材
4a 取付面
4b 円筒部
4c 開口
5 鉗子
5c ピン
6 操作ワイヤ
7 シース
8 支持部材
9 操作ユニット
9a 支持筒
9b ガイド部材
9c 可動ノヽンドノレ 9d 固定ハンドル
9e, 9f 指掛け孔
11 インナシース
12, 13 防振部材
発明を実施するための最良の形態
[0013] 以下に、本発明にかかる超音波処置具の実施の形態を、図面を参照して詳細に説 明する。図 1は、本発明にかかる超音波処置具の概略構成を一部破断して示す断面 図である。図 2は、図 1の超音波処置具先端の処置部,鉗子及び操作ワイヤを示す 斜視図である。図 3は、図 2を部分的に断面にして示した底面図である。
[0014] 超音波処置具 1は、図 1に示すように、超音波振動子ユニット 2、長尺の可撓性プロ ーブ 3、鉗子 5及び操作ユニット 9を備えている。
[0015] 超音波振動子ユニット 2は、図 1に示すように、ホーン 2aを有するボルト締めランジ ュバン型の振動子であり、支持部材 8に取り付けられ、電源ケーブル 2bによって電源 と接続されている。超音波振動子ユニット 2は、ケーシング 2eに収納した超音波振動 子 2d及びホーン 2aがフランジ部 2cでケーシング 2eに固定されている。このとき、電 源ケーブル 2bと前記電源との間にはフットスィッチが設けられ、超音波処置具 1は、 フットスィッチによって電源がオン ·オフされる。
[0016] 可撓性プローブ 3は、図 1に示すように、一端が超音波振動子 2dと接続され、超音 波振動子 2dが発した超音波を伝達する可撓性を有する伝達部材であり、チタン合金 ,ニッケル合金,ステンレス,ジュラルミン等の金属や石英ファイバ等が使用される。 可撓性プローブ 3は、他端の先端に処置部 3aが設けられている。ここで、可撓性プロ ーブ 3は、例えば、 90° 以上曲げたときに、弾性変形により略元の形に戻る程度の 可撓性を有している。
[0017] 処置部 3aは、図 2及び図 3に示すように、テーパ状の移行部 3bを介して可撓性プロ ーブ 3の先端に設けられ、超音波振動子 2dが発する超音波(図 3の点線参照)の波 長( λ )の略え Ζ2の長さを有し、先端が超音波の振動における腹となるように設定さ れている。処置部 3aは、超音波の伝達方向に直交する面における断面積を可撓性 プローブ 3の断面積よりも大きくすることによって、可撓性プローブ 3よりも大きな剛性 が付与されている。例えば、処置部 3aは、可撓性プローブ 3の断面積 Spに対する断 面積の比( = StZSp)を 1. 3≤StZSp≤8の範囲に設定する。また、処置部 3aは、 カバー部材 4に挿通されて先端がカバー部材 4カも延出している。このように断面積 を可撓性プローブ 3の断面積よりも大きくすることにより、処置部 3aは、鉗子 5との間 に生体組織を挟んでも曲がらな ヽ程度の剛性が付与される。
[0018] このとき、処置部 3aは、可撓性プローブ 3の断面積よりも大きく設定すると、移行部 3 bが超音波の振動における節位置に近い程、振幅の減衰率が大きくなる。このため、 移行部 3bは、図 3に示すように、超音波振動(図 3の点線参照)の腹位置に設けるこ とで、振幅の減衰率を最小限に抑えている。また、処置部 3aは、可撓性プローブ 3の 断面積よりも大きい。しかし、可撓性プローブ 3の断面積を基準とする超音波振動子 2dの断面積の比に関する一般的な値(10— 30)に比べると、可撓性プローブ 3の断 面積 Spに対する断面積の比が 1. 3≤StZSp≤8と小さい。このため、可撓性プロ一 ブ 3は、処置部 3aを設けても、振幅の減衰率に大きな影響を及ぼすことはない。そし て、処置部 3aは、超音波の振動における節位置に、処置部 3aと係合して生体組織を 把持する鉗子 5が開閉自在に取り付けられて 、る。
[0019] カバー部材 4は、図 2及び図 3に示すように、略円筒状の部材で、先端両側に鉗子 5を取り付ける互いに平行な取付面 4aが形成され、後部に形成した円筒部 4bによつ て取付面 4aとの間に操作ワイヤ 6を繰り出す開口 4cが形成されている。カバー部材 4 は、図 1に示すように、円筒部 4bにシース 7の一端が連結されている。シース 7は、他 端が支持部材 8と連結され、可撓性プローブ 3及び操作ワイヤ 6を覆って 、る。
[0020] 鉗子 5は、図 1乃至図 3に示すように、一端が鉗子 5に連結され、他端が操作ュ-ッ ト 9に連結される操作ワイヤ 6を介して操作ユニット 9によってピン 5cを中心として開閉 操作される(図 1矢印参照)。鉗子 5は、処置部 3aと係合する本体 5aの後部両側に後 方へ延出する連結アーム 5bが設けられている。鉗子 5は、 2つの連結アーム 5bを取 付面 4aに当接させ、超音波振動における節位置に取り付けられるピン 5cによって各 連結アーム 5bが処置部 3aと連結されている(図 3参照)。このように、鉗子 5は、節位 置にお 1、て処置部 3aと連結されることから、処置部 3aの超音波振動の影響を受ける ことはない。尚、ピン 5cは、図 4 1に示すように、処置部 3aを貫通させて取り付けても よい。また、図 4 2に示すように、ピン 5cに代えて、処置部 3aの超音波振動における 節位置に突起 3dを設け、突起 3dによって鉗子 5を処置部 3aに開閉自在に支持させ てもよい。
[0021] 操作ワイヤ 6は、図 2に示すように、一端が 2本に分岐され、分岐された各先端部分 力 S 2本の連結アーム 5bの後部にそれぞれ取り付けたワイヤピン 6aに連結されている 。そして、操作ワイヤ 6は、他端が操作ユニット 9の可動ハンドル 9cと連結されている。
[0022] 操作ユニット 9は、図 1に示すように、支持部材 8に取り付けられた支持筒 9a、 2本の ガイド部材 9b、可動ハンドル 9c及び固定ノヽンドル 9dを有している。支持筒 9aは、内 部に挿通した操作ワイヤ 6を可動ハンドル 9cへ案内する。ガイド部材 9bは、可動ハン ドル 9cを操作ワイヤ 6に沿ってスライド自在に案内する。可動ハンドル 9cは、操作ワイ ャ 6が連結される板状の部材で、両側に指掛け孔 9eが設けられ、図 1においてガイド 部材 9bに沿った矢印方向へ移動することによって操作ワイヤ 6を介して鉗子 5を開閉 する。固定ノ、ンドル 9dは、ガイド部材 9bの後端に取り付けられ、指掛け孔 9fが設けら れている。
[0023] 以上のように構成される超音波処置具 1は、例えば、内視鏡のチャンネルに挿通し 、処置部 3a及び鉗子 5を先端カゝら突出させ、或いは体腔内に直接挿入して使用され る。このとき、超音波処置具 1は、可動ハンドル 9cを固定ノヽンドル 9d側に引き寄せ、 図 1にお 、て操作ワイヤ 6を介して鉗子 5をピン 5cの周りに反時計方向に回動させる ことで、鉗子 5が処置部 3aと係合した閉状態にして前記チャンネル等に挿入する。
[0024] 挿入後は、可動ハンドル 9cを固定ハンドル 9dから引き離すように押し出す。これに より、鉗子 5が、操作ワイヤ 6を介してピン 5cの周りに時計方向に回動し、処置部 3aと の係合が解除された開状態になる。そして、前記内視鏡によって体腔内を観察しな 力 再び可動ハンドル 9cを操作して鉗子 5を閉じ、所望個所の生体組織を処置部 3a と鉗子 5とによって挟み、超音波処置を施す。このとき、処置部 3aは、可撓性プロ一 ブ 3の断面積よりも断面積を大きくすることによって高い剛性が付与されている。この ため、超音波処置具 1は、プローブ 3が可撓性を有していても、処置部 3aに高い剛性 が付与されていることから、処置部 3aと鉗子 5とによって生体組織を確実に把持して 超音波処置を施すことができる。 [0025] また、超音波処置具 1は、処置部 3aが可撓性プローブ 3を伝送される超音波の波 長の略 1Z2の長さを有し、処置部 3aの先端が超音波の振動における腹となるように 設定されている。このため、超音波処置具 1は、処置部 3aと鉗子 5とによって生体組 織を把持したときに、把持した生体組織に最も効率よく超音波処置を施すことができ る。
[0026] ここで、超音波処置具 1は、図 5に示すように、可撓性プローブ 3をインナシース 11 で覆うと共に、可撓性プローブ 3の超音波振動(点線参照)における節位置に、イン ナシース 11内面に当接する防振部材 12を設けてもよい。可撓性プローブ 3をインナ シース 11で覆うと、超音波処置具 1は、可撓性プローブ 3と鉗子 5の開閉操作によつ て図中左右方向に動く操作ワイヤ 6とがインナシース 11によって隔離されるため、可 橈性プローブ 3と操作ワイヤ 6とがシース 7内で干渉して絡まることが防止される。
[0027] また、可撓性プローブ 3に防振部材 12を設けると、可撓性プローブ 3を伝達される 超音波の振動に起因して可撓性プローブ 3に発生するノイズ振動が抑制され、超音 波の振動を安定して伝達することができる。このとき、防振部材 12は、耐熱性を有す るフッ素榭脂,ポリイミド,ゴム等力もなる素材を使用し、図 6に示すように、可撓性プ ローブ 3に周方向に形成した凹部 3cに取り付ける。
[0028] ここで、防振部材 12は、図 7に示すように、可撓性プローブ 3に周方向に形成される 凹部 3cを、可撓性プローブ 3の長手方向に沿って延びる長手状の溝とし、この溝に 取り付けることで、超音波振動の節位置を含む前後数 mmの範囲に設けてもよい。ま た、防振部材は、図 8に示す防振部材 13のように、可撓性プローブ 3の外周に周方 向に間隔をお 、て設けてもょ 、。
産業上の利用可能性
[0029] 以上のように、本発明に力かる超音波処置具は、処置部に剛性を付与したので、可 橈性プローブを用 、た超音波処置具に有用である。

Claims

請求の範囲
[1] 可撓性を有する伝達部材の先端へ超音波発生手段が発生した超音波を伝達し、 超音波処置を施す超音波処置具であって、
前記伝達部材の先端に処置部を設けると共に、前記処置部と係合して生体組織を 把持し、操作ワイヤによって開閉される把持部材を前記処置部に設け、
前記処置部は、前記超音波の波長の略 1Z2の長さを有し、先端が前記超音波の 振動における腹となり、前記超音波の伝達方向に直交する面における断面積を前記 伝達部材よりも大きくして剛性が付与され、
前記把持部材は、前記超音波の振動における節位置にぉ 、て前記処置部と係合 され、
前記操作ワイヤは、一端が前記把持部材に連結され、他端が操作部材に連結され て前記操作部材によって操作されることを特徴とする超音波処置具。
[2] 前記伝達部材は、シースによって覆われて 、ることを特徴とする請求項 1に記載の 超音波処置具。
[3] 前記伝達部材は、前記超音波の振動における節位置に、前記シース内面と当接す る防振部材が設けられていることを特徴とする請求項 1又は 2に記載の超音波処置 具。
PCT/JP2004/016877 2004-04-20 2004-11-12 超音波処置具 Ceased WO2005102197A1 (ja)

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EP1738703A4 (en) 2010-08-25

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