JP3386517B2 - Ultrasonic treatment equipment - Google Patents
Ultrasonic treatment equipmentInfo
- Publication number
- JP3386517B2 JP3386517B2 JP17218593A JP17218593A JP3386517B2 JP 3386517 B2 JP3386517 B2 JP 3386517B2 JP 17218593 A JP17218593 A JP 17218593A JP 17218593 A JP17218593 A JP 17218593A JP 3386517 B2 JP3386517 B2 JP 3386517B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- vibration
- transmitting member
- ultrasonic
- cured film
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、超音波振動で生体組織
や結石破壊等の処置を行う超音波処置装置に関する。
【０００２】
【従来の技術】最近、超音波処置装置を用いて、前立腺
の切除術や結石の破壊等の処置が行なわれている。かか
る超音波処置装置は、振動子とホーンを連結するととも
に、そのホーンの先端に振動伝達部材を連結して構成さ
れており、振動子から発生する超音波振動をホーンで増
幅（集中）して振動伝達部材に伝達し、振動伝達部材の
先端を生体内の患部組織に押し当てることにより、該先
端で組織を破壊切断したり、乳化させたりしている。と
ころで、図８に示すように、振動伝達部材としてパイプ
ａを用いた超音波処置装置においては、従来より、図８
（Ａ）に示すようにパイプａに対しパイプ先端ｔにおい
て振幅の腹となるように超音波振動ｂを伝えることが行
なわれている。すなわち、パイプ先端ｔに最大振幅を生
じさせて上記各種の処置を行なうようにしている。そし
て、図８（Ｂ）に示すように、この時の応力分はｒのよ
うである。しかるに、このような超音波処置装置の振動
伝達部材は、通常、細径の金属パイプが長時間かつ長期
間使用されるため、金属疲労や振動摩擦による発熱等に
より振動伝達部材の機械的強度が低下し、使用中に折損
することがある。このようにパイプが使用中に折損する
と、例えば腎臓内の結石を破砕する超音波処置装置で
は、振動伝達部材の折損片が腎臓内に残留して回収不能
となる可能性があり、極めて危険であった。そこで、こ
のような事故を防ぐために、特開昭６３−１２２４４７
号公報で開示されるように、パイプの振動子側の付け根
に機械的強度の弱い部分を設けて、パイプを振動させた
場合、最初に弱い部分から折れるような構造とし、使用
中にパイプが切損した場合に容易に回収できるようにし
ている。
【０００３】
【発明が解決しようとする課題】しかし、特開昭６３−
１２２４４７号公報の超音波処置装置によれば、それ以
前の超音波処置装置が有していた、折損した破片が体内
に残る危険性は減少するが、パイプ自体は超音波振動に
対し強度向上がなされておらず、逆に強度の弱い部分を
設けたため、加えることができる振幅は小さくなる。よ
って、結石等を破砕する能力が劣るばかりでなく、大振
幅を必要とする組織の乳化処置が難しくなる。また、意
図的にパイプに折れ易い部分を設けるために、超音波処
置装置の寿命が短くなりコスト的な問題が生じる。本発
明は、上記従来技術の問題点に鑑みなされたもので、振
動伝達部材先端の振幅を大きく振動させることができる
とともに、折損（疲労破壊）しにくく、かつ仮に破損し
た場合にあっても破損片を体内に残すことがない超音波
処置装置を提供することを目的とする。
【０００４】
【課題を解決するための手段】上記目的を達成するため
に本発明の超音波処置装置は、超音波振動を発生可能な
超音波振動子と、前記超音波振動子に連結し、前記超音
波振動子で発生された前記超音波振動を生体組織に伝達
可能な管状に形成された振動伝達部材と、前記振動伝達
部材の外表面にポリマー剤を塗布して硬化形成させた、
前記振動伝達部材の伸縮性より高い伸縮性の第１の硬化
膜層と、前記振動伝達部材の内表面にポリマー剤を塗布
して硬化形成させた、前記振動伝達部材の伸縮性より高
い伸縮性の第２の硬化膜層と、を具備したことを特徴と
する。
【０００５】
【作用】超音波振動により共振している振動伝達部材で
は、部分的に振動伝達部材の伸び縮みに対応して、応力
が長さ方向に発生するが、かかる応力は節で最大とな
り、腹で最小となる。この時の振動パターンは、振動伝
達部材の先端が腹（最大振幅）となるようにすることに
より、先端部で効率的に組織の乳化等の処置が可能とな
る。また、ホーンと振動伝達部材の境界部（接続部）が
腹となる振動パターンとすることにより、この部分に生
じる応力は最小となり、接続部でホーンや振動伝達部材
が折れることはなくなる。このとき振動伝達部材の節部
にかかる（引張り）応力により、振動伝達部材の表面に
おいて、亀裂が発生し、さらにそれが進行して振動伝達
部材の折損につながるのであるが、振動伝達部材表面は
一般に無欠陥ではなくクラックや傷といった欠陥が存在
し、ここに応力が集中するとともに、この表面に存在す
る欠陥が、亀裂の進行を促進（ノッチ効果）している。
【０００６】本発明においては、振動伝達部材の外表面
と内表面をポリマー剤を塗布して硬化形成させた第１お
よび第２の硬化膜層で覆うため、振動伝達部材の内外表
面に存在するクラック等の欠陥はポリマー剤により埋め
られるので、応力集中を起こさずノッチ効果を生じるこ
とが押さえられえる。よって、本発明のように、内外表
面をポリマー剤の第１および第２の硬化膜層で覆った振
動伝達部材においては、覆っていないものに比べ金属疲
労の進行を抑圧でき、寿命が長くなる。また本発明にお
いては、内外表面を振動伝達部材よりも延性に富んだ第
１および第２の硬化膜層で覆っているので、振動伝達部
材が伝達する超音波を抑圧することがなく、超音波処置
に必要な最適条件による振幅を設定することができると
ともに、仮に振動伝達部材が破断した場合でも、第１お
よび第２の硬化膜層が延びて、その破断した先端側の破
損片を把持するように覆われているため、体内に残留す
ることはない。
【０００７】
【実施例１】図１は、本発明に係る超音波処置装置の実
施例１における振動伝達部材であるパイプを示す断面
図、図２は、超音波処置装置を示す正面図、図３は、パ
イプに生じる振幅及び応力状態を示す説明図である。図
２において、１はランジュバン型の振動子（圧電素子、
電極、ブロックを接続してなる）、２は振動子１に連結
したコニカル型のホーン、３はホーン２の先端に連結し
た振動伝達部材としてのパイプである。これらの振動子
１，ホーン２，パイプ３は、それぞれ各部品の接続部に
ねじ部が設けられ、このねじ部により螺合接続されてい
る。
【０００８】パイプ３は、その長さがｎ／２・λ（ｎは
自然数、λは波長）となるように設定されるとともに、
振動子１から発する超音波振動ｂの腹が、図３（Ａ）に
示すようにホーン２とパイプ３の境界部に位置するよう
に定められており、パイプ３の先端ｔが腹となるように
超音波振動ｂをパイプ３へ伝達させることができるよう
にしている。
【０００９】そして、パイプ３の外表面３ａと内表面３
ｂには、図１に示すように、第１の硬化膜層４ａと第２
の硬化膜層４ｂから成る保護膜４が設けられている。こ
の保護膜４の第１および第２の硬化膜層４ａ，４ｂは、
パイプ３に熱処理（５００℃、６時間の時効）を施した
後、ディッピングにより２液混合型エポキシ系接着剤
（（株）アルファ技研、商品名アルテコＦ−０５）を外
表面３ａと内表面３ｂに塗布し、８０℃の温度で２時間
加熱硬化して形成した。
【００１０】ここに、パイプ３の内外表面３ａ，３ｂを
微視的に観ると、図４に示すように欠陥５があるが、保
護膜４の第１および第２の硬化膜層４ａ，４ｂは、この
欠陥５を埋めるのが目的であるため、パイプ３の全面を
覆っていればかならずしも均一な厚さにする必要がない
が、エポキシ系接着剤は接着力が強いので余り厚いと、
保護膜４の第１および第２の硬化膜層４ａ，４ｂにより
Ｔｉ合金からなるパイプ３の共振による伸び縮みを抑え
てしまう虞れがあるため、保護膜４の第１および第２の
硬化膜層４ａ，４ｂの厚さは１０μｍ以下が好ましいと
ともにパイプ３の伸縮性より高い硬化膜層により形成す
る。
【００１１】なお、図５は、パイプ３が共振により伸び
縮みする際にパイプ３の内外表面３ａ，３ｂに存在する
欠陥５による応力集中効果（ノッチ効果）の影響で、パ
イプ３に亀裂６が生じている状態を示している。
【００１２】本実施例の超音波処置装置にあっては、振
動子１に駆動電圧を印加すると、振動子１からの超音波
振動ｂがホーン２を通じてパイプ３へ伝達され、また、
パイプ３には図３（Ｂ）に示すような応力部分ｒが生ず
る。このとき、一般に、パイプは共振による伸び縮みを
繰り返し、パイプ３の内外表面３ａ，３ｂに存在する欠
陥部でノッチ効果を起こすが、本実施例におけるパイプ
３は、内外表面３ａ，３ｂに保護膜４の第１および第２
の硬化膜層４ａ，４ｂを設け欠陥５を埋めてあるため応
力集中を起こすことなく、パイプ３を振動させることが
できる。
【００１３】本実施例によれば、パイプ３の内外表面３
ａ，３ｂに保護膜４の第１および第２の硬化膜層４ａ，
４ｂを形成したので、保護膜４を設けていない従来のも
のに比べ、振幅を大きくしても欠陥５における応力集中
がなくなり、共振時に折れることがなくなった。このた
め、パイプ３の先端ｔの振幅を従来よりも大きくするこ
とができ、結石等の破壊効率を高めることができた。さ
らに、パイプ３の内外表面３ａ，３ｂを保護膜４の第１
および第２の硬化膜層４ａ，４ｂで覆ってあるため、仮
にパイプ３が折れた場合でも、折れたパイプ３及びパイ
プ３の破片は体内に残ることなく安全である。
【００１４】実際に、本実施例の超音波処置装置と従来
技術の装置を比較すると、パイプ先端ｔを振幅３００μ
ｍで振動させた場合、保護膜のない従来のパイプでは１
０本中９本が折れ、そのうち７本は折れた部分から先端
側が取れたが、本実施例のパイプ３では、１０本中１本
が細径パイプの接続部分で折れたが、保護膜４により、
折れた先端部が脱落することはなかった。
【００１５】
【実施例２】本発明の実施例２を図１を用いて以下に説
明する。本実施例は、東燃（株）製ポリシラザンＰＨＰ
Ｓ−２を用い、無機ポリマーよりなる保護膜４の第１お
よび第２の硬化膜層４ａ，４ｂをパイプ３の内外表面３
ａ，３ｂに設けた。また、パイプ３は、β型Ｔｉ合金で
あるＴｉ−１５Ｖ−３Ａｌ−３Ｓｎ−３Ｃｒを用いた。
保護膜４の第１および第２の硬化膜層４ａ，４ｂの形成
にあたり、ポリシラザンをディッピングによりパイプ３
の内外表面３ａ，３ｂに塗布し、１００℃の温度で１０
分乾燥させた後、４００℃、３０分の焼成を行い、パイ
プ３の内外表面３ａ，３ｂにこのパイプ３より伸縮性の
高い第１および第２の硬化膜層４ａ，４ｂを形成するこ
とによりを覆った。その他の構成は実施例１と同様であ
る。
【００１６】本実施例によれば、上記実施例１と同様な
作用、効果を得ることができる。また、実際に、保護膜
４の第１および第２の硬化膜層４ａ，４ｂを設けたパイ
プ３を使用した本実施例の超音波処置装置を、保護膜４
を設けない従来の同一径パイプと同等の先端振幅３００
μｍで振動させた場合、従来の同一径パイプでは１０本
中８本が折れ、そのうち５本は折れた部分から先端側が
取れたが、本実施例におけるパイプ３では、１０本中２
本が細径パイプの接続部分で折れたが、内外表面３ａ，
３ｂに設けた保護膜４の第１および第２の硬化膜層４
ａ，４ｂにより、折れた先端部が取れることはなかっ
た。
【００１７】
【実施例３】図６は、本発明の実施例３におけるパイプ
の断面図、図７は、パイプに生ずる振幅と応力を示す線
図である。図６に示すように、パイプ１０は、細径部１
０ａと太径部１０ｂとから構成され、細径部１０ａは、
パイプ１０の先端から長さλ／４だけ形成されている。
細径部１０ａと太径部１０ｂの接続部分は、細径部１０
ａの外径をφ１，太径部１０ｂの外径をφ２とした場
合、（φ１＋φ２）／２の曲率半径を有する曲面に形成
されている。その他の構成は上記実施例１と同様であ
る。
【００１８】本実施例によれば、パイプ１０の細径部１
０ａの断面積をＳ１（＝２２ｍｍ２）、太径部１０ｂの
断面積をＳ２（＝１２５ｍｍ２）としたとき、太径部１
０ｂから細径部に伝えられる超音波振動は、細径部１０
において、その振動が約Ｓ２／Ｓ１倍に増幅されるた
め、図７（Ａ）に示すように、パイプ１０の先端（細径
部１０ａの先端）の振幅を大きくすることができる。ま
た、このときパイプ１０にかかる応力は、図７（Ｂ）に
示すように、細径部１０ａと太径部１０ｂとの接続部分
における細径部１０ａのパイプ１０側で最大となる。こ
のため、パイプ１０に超音波振動を生じさせ場合、応力
が最大となる部分のみで折れる可能性を有するが、パイ
プ１０の内外表面１０ｃ，１０ｄの全表面に保護膜４の
第１および第２の硬化膜層４ａ，４ｂを設けてあるた
め、パイプ１０の内外表面１０ｃ，１０ｄの全表面に存
在する欠陥は埋められ、上記実施例と同様にパイプ１０
が折れることなく振動させることができる。
【００１９】したがって、パイプ１０に加える振幅に対
して、パイプ１０（細径部１０ａ）の先端に生ずる振幅
を印加振幅より大きくすることができるので、同一径の
パイプを使用した場合に比べ、より効果的に結石破壊等
の治療を行なうことが可能になった。
【００２０】実際に、パイプ１０に振幅６０μｍの超音
波振動を加えたところ、パイプ１０の先端部では、約Ｓ
２／Ｓ１（＝１２５／２２）倍に相当する最大振幅３０
０μｍで振動させることができた。そして、パイプ１０
の先端を上記のように振幅３００μｍで１０本振動させ
た時、折れたパイプはなかったが、従来の保護膜を設け
ない同一径のパイプでは、１０本中９本が折れ、そのう
ち７本は折れた部分から先端側が取れた。
【００２１】なお、上記各実施例において、パイプ材料
として、Ｔｉ−１５Ｖ−３Ａｌ−３Ｓｎ−３Ｃｒを用い
た場合を示したが、例えば、表１に示すような耐力が高
い材料であれば上記実施例で挙げた材料に限定されるこ
とはない。
【００２２】
【表１】
【００２３】しかし、耐力が高くても、振幅を大きくか
せぐためには、なるべくヤング率の低い材料を用いるこ
とが望ましく、表１のα＋β型チタン合金、β型チタン
合金が最適である。中でも、Ｔｉ−１５Ｖ−３Ａｌ−３
Ｓｎ−３Ｃｒは、長尺でかつ安定した品質でパイプ加工
ができるため、現在のところ最も優れた材料であり、本
実施例においても採用している。
【００２４】また、ポリマー剤を塗布して硬化形成して
なる保護層４の第１および第２の硬化膜層４ａ，４ｂの
材質もパイプ３の内外表面３ａ，３ｂ，１０ｃ，１０ｄ
に確実に付着し、かつパイプ３，１０の伸縮性より高い
伸縮性のものであれば、その材質には限定されず、エポ
キシ系接着剤のような有機物あるいはポリシラザンのよ
うな無機物が用いられ、ディッピング、吹き付け、刷毛
塗り等により保護層４の第１および第２の硬化膜層４
ａ，４ｂを設けることができる。さらに、保護層４とし
ての第１および第２の硬化膜層４ａ，４ｂの厚さは、振
動伝達部材の共振による伸び縮みを抑えない厚さ、経験
的に１０μｍ以下程度が好ましい。
【００２５】
【発明の効果】以上のように、本発明によれば、振動伝
達部材の内外表面を第１および第２の硬化膜層から成る
保護膜で覆うので、振動伝達部材の内外表面に存在する
欠陥部に保護膜が入り込み、欠陥部での応力集中を抑
制、阻止することができる結果、保護膜、特に内外表面
の第１および第２の硬化膜を設けていない従来のものに
比べ、振動伝達部材に存在する欠陥の応力集中を懸念す
ることなく、振幅を大きくすることができるとともに、
適切な振幅を選択しつつ処置することが可能となり、よ
り効果的に結石破壊等の治療を行えることができるもの
で、超音波処置装置本来の機能をより向上することがで
きる。
【００２６】また、振動伝達部材に亀裂が生じた場合で
も、振動伝達部材の内外表面をポリマー剤を塗布して硬
化形成した第１および第２の硬化膜層から成る保護膜で
覆うので、振動伝達部材の折れた部分が脱落したり、破
片を発生することがなく、折れた振動伝達部材および振
動伝達部材の破片が体内に残存するのを確実に防止する
ことができるので、信頼性の高い超音波処置装置を提供
することができる。
【００２７】さらに、振動伝達部材の内外表面を覆う第
１および第２の硬化膜層は、振動伝達部材の伸縮性より
高い伸縮性のある硬化膜層により形成するもので、振動
伝達部材の本来の機能を阻害することなく、しかも前記
欠陥の応力集中を抑制、阻止する作用効果を達成し、同
時に振動伝達部材自体の疲労強度を向上させることがで
き、寿命の長い超音波処置装置を提供することができ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic treatment apparatus for treating a living tissue or a calculus by ultrasonic vibration. [0002] Recently, treatments such as resection of the prostate and destruction of calculi have been performed using an ultrasonic treatment apparatus. Such an ultrasonic treatment apparatus is configured such that a vibrator and a horn are connected and a vibration transmitting member is connected to a tip of the horn, and the ultrasonic vibration generated from the vibrator is amplified (concentrated) by the horn. The vibration is transmitted to the vibration transmitting member, and the distal end of the vibration transmitting member is pressed against the diseased tissue in the living body, whereby the tissue is destructively cut or emulsified at the distal end. By the way, as shown in FIG. 8, in an ultrasonic treatment apparatus using a pipe a as a vibration transmitting member, conventionally, FIG.
As shown in (A), ultrasonic vibration b is transmitted to a pipe a so as to have an antinode of amplitude at a pipe tip t. That is, the above-described various treatments are performed by generating the maximum amplitude at the pipe tip t. Then, as shown in FIG. 8B, the stress component at this time is like r. However, as the vibration transmitting member of such an ultrasonic treatment apparatus, since a small-diameter metal pipe is usually used for a long time and for a long period of time, the mechanical strength of the vibration transmitting member due to heat generation due to metal fatigue and vibration friction is increased. May drop and break during use. If the pipe breaks during use in this way, for example, in an ultrasonic treatment apparatus that breaks stones in the kidney, broken pieces of the vibration transmission member may remain in the kidney and cannot be collected, which is extremely dangerous. there were. In order to prevent such an accident, Japanese Patent Application Laid-Open No.
As disclosed in the publication, a portion having a low mechanical strength is provided at the base of the vibrator side of the pipe, and when the pipe is vibrated, the structure is first broken from the weak portion, and the pipe is used during use. In the event of breakage, it can be easily recovered. [0003] However, Japanese Patent Application Laid-Open
According to the ultrasonic treatment apparatus disclosed in JP-A-122247, the risk of broken fragments remaining in the body, which the previous ultrasonic treatment apparatus has, is reduced, but the pipe itself has improved strength against ultrasonic vibration. However, since a weak portion is provided, the amplitude that can be added becomes small. Therefore, not only is the ability to crush stones or the like inferior, but also it becomes difficult to emulsify a tissue requiring a large amplitude. In addition, since the pipe is intentionally provided with a portion that is easily broken, the life of the ultrasonic treatment apparatus is shortened, which causes a problem in cost. The present invention has been made in view of the above-described problems of the related art, and can vibrate the amplitude of the tip of the vibration transmitting member to a large extent, hardly break (fatigue fracture), and break even if it is broken. It is an object of the present invention to provide an ultrasonic treatment apparatus that does not leave pieces in the body. [0004] In order to achieve the above object, an ultrasonic treatment apparatus according to the present invention comprises an ultrasonic vibrator capable of generating ultrasonic vibration, and an ultrasonic vibrator connected to the ultrasonic vibrator. A vibration transmitting member formed in a tubular shape capable of transmitting the ultrasonic vibration generated by the ultrasonic vibrator to a living tissue, and a polymer agent is applied to an outer surface of the vibration transmitting member and cured to form.
A first cured film layer having an elasticity higher than that of the vibration transmitting member, and a polymer agent applied to an inner surface of the vibration transmitting member and formed by curing, the elasticity being higher than the elasticity of the vibration transmitting member. And a second cured film layer. In the vibration transmitting member resonating due to the ultrasonic vibration, stress is generated in the length direction in accordance with the expansion and contraction of the vibration transmitting member, but the stress becomes maximum at the node. , Minimum on belly. The vibration pattern at this time is such that the distal end of the vibration transmitting member has an antinode (maximum amplitude), so that treatment such as tissue emulsification can be efficiently performed at the distal end. Further, by forming a vibration pattern in which the boundary (connection portion) between the horn and the vibration transmission member becomes an antinode, the stress generated in this portion is minimized, and the horn and the vibration transmission member do not break at the connection portion. At this time, cracks are generated on the surface of the vibration transmitting member due to (tensile) stress applied to the nodes of the vibration transmitting member, and the cracks further progress, leading to breakage of the vibration transmitting member. In general, defects such as cracks and scratches are present instead of no defects, and stress concentrates on the defects, and the defects existing on the surface accelerate the progress of cracks (notch effect). In the present invention, since the outer and inner surfaces of the vibration transmitting member are covered with the first and second cured film layers formed by applying a polymer agent and being cured, the outer and inner surfaces are present on the inner and outer surfaces of the vibration transmitting member. Since defects such as cracks are filled with the polymer agent, it is possible to suppress occurrence of a notch effect without causing stress concentration. Therefore, in the vibration transmitting member in which the inner and outer surfaces are covered with the first and second cured film layers of the polymer agent as in the present invention, the progress of metal fatigue can be suppressed as compared with the uncovered member, and the life is prolonged. . Further, in the present invention, since the inner and outer surfaces are covered with the first and second cured film layers which are more ductile than the vibration transmitting member, the ultrasonic waves transmitted by the vibration transmitting member are not suppressed, and The amplitude can be set according to the optimum conditions required for the treatment, and even if the vibration transmitting member is broken, the first and second cured film layers extend to grip the broken piece on the broken tip side. So it does not remain in the body. FIG. 1 is a sectional view showing a pipe which is a vibration transmitting member in an ultrasonic treatment apparatus according to a first embodiment of the present invention. FIG. 2 is a front view showing the ultrasonic treatment apparatus. FIG. 3 is an explanatory diagram showing an amplitude and a stress state generated in the pipe. In FIG. 2, reference numeral 1 denotes a Langevin type vibrator (piezoelectric element,
2 is a conical horn connected to the vibrator 1, and 3 is a pipe as a vibration transmitting member connected to the tip of the horn 2. The vibrator 1, the horn 2, and the pipe 3 are each provided with a screw portion at a connection portion of each component, and are screwed together by the screw portion. The length of the pipe 3 is set to be n / 2 · λ (n is a natural number and λ is a wavelength).
The antinode of the ultrasonic vibration b emitted from the vibrator 1 is determined so as to be located at the boundary between the horn 2 and the pipe 3 as shown in FIG. 3A, and the tip t of the pipe 3 becomes the antinode. The ultrasonic vibration “b” can be transmitted to the pipe 3. The outer surface 3a and the inner surface 3 of the pipe 3
b, as shown in FIG. 1, a first cured film layer 4a and a second cured film layer 4a.
The protective film 4 made of the cured film layer 4b is provided. The first and second cured film layers 4a and 4b of the protective film 4
After heat-treating the pipe 3 (aging at 500 ° C. for 6 hours), the two-part mixed epoxy adhesive (Alpha Giken Co., Ltd., trade name: Arteco F-05) is dipped into an outer surface 3a and an inner surface 3b. And cured by heating at a temperature of 80 ° C. for 2 hours. Here, when the inner and outer surfaces 3a and 3b of the pipe 3 are microscopically observed, there are defects 5 as shown in FIG. 4, but the first and second cured film layers 4a and 4b of the protective film 4 are present. The purpose of this is to fill the defect 5, so that it is not always necessary to cover the entire surface of the pipe 3 with a uniform thickness. However, since the epoxy adhesive has a strong adhesive force, if it is too thick,
Since the first and second cured film layers 4a and 4b of the protective film 4 may suppress expansion and contraction of the pipe 3 made of Ti alloy due to resonance, the first and second cured films of the protective film 4 may be suppressed. The thickness of the layers 4a and 4b is preferably 10 μm or less and is formed of a cured film layer having higher elasticity than the pipe 3. FIG. 5 shows that when the pipe 3 expands and contracts due to resonance, cracks 6 are formed in the pipe 3 due to the stress concentration effect (notch effect) due to the defects 5 present on the inner and outer surfaces 3a and 3b of the pipe 3. This shows the situation that has occurred. In the ultrasonic treatment apparatus of this embodiment, when a driving voltage is applied to the vibrator 1, the ultrasonic vibration b from the vibrator 1 is transmitted to the pipe 3 through the horn 2, and
The pipe 3 has a stress portion r as shown in FIG. At this time, in general, the pipe repeatedly expands and contracts due to resonance, and causes a notch effect at a defective portion existing on the inner and outer surfaces 3a and 3b of the pipe 3. However, the pipe 3 in this embodiment has a protective film on the inner and outer surfaces 3a and 3b. Fourth first and second
Since the cured film layers 4a and 4b are provided to fill the defects 5, the pipe 3 can be vibrated without causing stress concentration. According to this embodiment, the inner and outer surfaces 3 of the pipe 3
a, 3b, the first and second cured film layers 4a,
Since the 4b was formed, stress concentration at the defect 5 was eliminated even when the amplitude was increased, and breakage at the time of resonance was eliminated, as compared with the conventional device without the protective film 4. For this reason, the amplitude of the tip t of the pipe 3 can be made larger than before, and the destruction efficiency of stones and the like can be increased. Further, the inner and outer surfaces 3a and 3b of the pipe 3
And since it is covered with the second cured film layers 4a and 4b, even if the pipe 3 is broken, the broken pipe 3 and fragments of the pipe 3 do not remain in the body and are safe. Actually, when comparing the ultrasonic treatment apparatus of the present embodiment with the prior art apparatus, the pipe tip t has an amplitude of 300 μm.
m, the conventional pipe without the protective film has
Nine of the 0 pieces broke, and 7 of them broke at the leading end from the broken portion. In the pipe 3 of the present embodiment, one of the 10 pieces broke at the connecting portion of the small-diameter pipe. By
The broken tip did not fall off. Embodiment 2 Embodiment 2 of the present invention will be described below with reference to FIG. In this embodiment, a polysilazane PHP manufactured by Tonen Corp. is used.
Using S-2, the first and second cured film layers 4a and 4b of the protective film 4 made of an inorganic polymer are applied to the inner and outer surfaces 3 of the pipe 3.
a, 3b. Further, for the pipe 3, Ti-15V-3Al-3Sn-3Cr which is a β-type Ti alloy was used.
In forming the first and second cured film layers 4a and 4b of the protective film 4, the pipe 3 is formed by dipping polysilazane.
And applied to the inner and outer surfaces 3a and 3b of
After drying for a minute, baking is performed at 400 ° C. for 30 minutes to form first and second cured film layers 4 a and 4 b having higher elasticity than the pipe 3 on the inner and outer surfaces 3 a and 3 b of the pipe 3. Covered. Other configurations are the same as in the first embodiment. According to this embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, actually, the ultrasonic treatment apparatus of this embodiment using the pipe 3 provided with the first and second cured film layers 4a and 4b of the protective film 4 is replaced with the protective film 4
Tip amplitude 300 equivalent to conventional same-diameter pipes without
When vibrated at μm, eight out of ten conventional pipes of the same diameter broke, and five of them broke the leading end from the broken part. In the pipe 3 in this embodiment, two out of ten pipes were broken.
The book broke at the connection of the small diameter pipe, but the inner and outer surfaces 3a,
First and second cured film layers 4 of protective film 4 provided on 3b
Due to a and 4b, the broken tip did not come off. FIG. 6 is a sectional view of a pipe according to a third embodiment of the present invention, and FIG. 7 is a diagram showing amplitude and stress generated in the pipe. As shown in FIG. 6, the pipe 10 is
0a and a large diameter portion 10b, and the small diameter portion 10a
A length of λ / 4 is formed from the tip of the pipe 10.
The connection between the small diameter portion 10a and the large diameter portion 10b is
When the outer diameter of a is φ 1 and the outer diameter of the large diameter portion 10b is φ 2 , it is formed on a curved surface having a radius of curvature of (φ 1 + φ 2 ) / 2. Other configurations are the same as those in the first embodiment. According to this embodiment, the small diameter portion 1 of the pipe 10
0a is S 1 (= 22 mm 2 ), and the cross-sectional area of the large-diameter portion 10b is S 2 (= 125 mm 2 ).
0b is transmitted to the small-diameter portion by the ultrasonic vibration.
In, since the vibration is amplified to approximately S 2 / S 1 times, as shown in FIG. 7 (A), it is possible to increase the amplitude of the tip of the pipe 10 (the tip of the small-diameter portion 10a). Further, at this time, the stress applied to the pipe 10 becomes maximum on the pipe 10 side of the small diameter portion 10a in the connection portion between the small diameter portion 10a and the large diameter portion 10b, as shown in FIG. For this reason, when ultrasonic vibration is generated in the pipe 10, there is a possibility that the pipe 10 is broken only at the portion where the stress is maximum, but the first and second protection films 4 are formed on the entire inner and outer surfaces 10 c and 10 d of the pipe 10. Since the cured film layers 4a and 4b are provided, defects existing on the entire inner and outer surfaces 10c and 10d of the pipe 10 are filled, and the pipe 10
Can be vibrated without breaking. Therefore, the amplitude generated at the tip of the pipe 10 (small diameter portion 10a) can be made larger than the applied amplitude with respect to the amplitude applied to the pipe 10, so that the amplitude is larger than when the pipes having the same diameter are used. It has become possible to effectively treat stone destruction and the like. When an ultrasonic vibration having an amplitude of 60 μm was actually applied to the pipe 10, about S
The maximum amplitude 30 corresponding to 2 / S 1 (= 125/22) times
It was possible to vibrate at 0 μm. And the pipe 10
When 10 tips were vibrated at an amplitude of 300 μm as described above, there were no broken pipes. However, in the case of conventional pipes having the same diameter without a protective film, 9 out of 10 pipes were broken, and 7 of them were broken. The tip side was removed from the broken part. In each of the above embodiments, the case where Ti-15V-3Al-3Sn-3Cr is used as the pipe material is shown. It is not limited to the materials given in the examples. [Table 1] However, in order to increase the amplitude even if the proof stress is high, it is desirable to use a material having as low a Young's modulus as possible, and the α + β type titanium alloy and β type titanium alloy shown in Table 1 are most suitable. Among them, Ti-15V-3Al-3
Sn-3Cr is the most excellent material at present because it can be processed into a long and stable quality pipe, and is also used in this embodiment. The material of the first and second cured film layers 4a and 4b of the protective layer 4 formed by applying and curing the polymer agent is also the inner and outer surfaces 3a, 3b, 10c and 10d of the pipe 3.
The material is not particularly limited as long as it has a higher elasticity than the elasticity of the pipes 3 and 10, and an organic material such as an epoxy adhesive or an inorganic material such as polysilazane is used. First and second cured film layers 4 of protective layer 4 by dipping, spraying, brushing, etc.
a, 4b can be provided. Further, the thickness of the first and second cured film layers 4a and 4b as the protective layer 4 is preferably a thickness which does not suppress expansion and contraction due to resonance of the vibration transmitting member, and is empirically about 10 μm or less. As described above, according to the present invention, since the inner and outer surfaces of the vibration transmitting member are covered with the protective films composed of the first and second cured film layers, the inner and outer surfaces of the vibration transmitting member are covered. As a result, the protective film enters the existing defective portion, and the concentration of stress at the defective portion can be suppressed or prevented. As a result, the protective film, especially the first and second cured films on the inner and outer surfaces, is not provided. The amplitude can be increased without fear of stress concentration of a defect existing in the vibration transmitting member,
It is possible to perform treatment while selecting an appropriate amplitude, and it is possible to more effectively perform treatment such as calculus destruction, so that the original function of the ultrasonic treatment apparatus can be further improved. Even if a crack is generated in the vibration transmitting member, since the inner and outer surfaces of the vibration transmitting member are covered with the protective film composed of the first and second cured film layers formed by applying a polymer agent and curing. Since the broken portion of the transmission member does not fall off or generate fragments, it is possible to reliably prevent the broken vibration transmission member and the fragments of the vibration transmission member from remaining in the body. An ultrasonic treatment device can be provided. Further, the first and second cured film layers covering the inner and outer surfaces of the vibration transmitting member are formed of an elastic cured film layer having a higher elasticity than the elasticity of the vibration transmitting member. The present invention provides an ultrasonic treatment apparatus having a long service life, capable of achieving the effect of suppressing and preventing the stress concentration of the defect without impairing the function of the vibration transmission member, and at the same time, improving the fatigue strength of the vibration transmission member itself. be able to.
【図面の簡単な説明】
【図１】本発明の実施例１における超音波処置装置のパ
イプを示す断面図である。
【図２】本発明の実施例１の超音波処置装置を示す正面
図である。
【図３】本発明の実施例１における超音波処置装置のパ
イプに生じる振幅と応力を示す線図である。
【図４】図１におけるＣ部の拡大断面図である。
【図５】パイプに生じる亀裂の状態を示すパイプの断面
図である。
【図６】本発明の実施例３における超音波処置装置のパ
イプを示す断面図である。
【図７】本発明の実施例３におけるパイプに生じる振幅
と応力を示す線図である。
【図８】従来技術を説明するための説明図である。
【符号の説明】
１ 振動子
２ ホーン
３ １０ パイプ
４ 保護膜BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a pipe of an ultrasonic treatment apparatus according to Embodiment 1 of the present invention. FIG. 2 is a front view showing the ultrasonic treatment apparatus according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating amplitude and stress generated in a pipe of the ultrasonic treatment apparatus according to the first embodiment of the present invention. FIG. 4 is an enlarged sectional view of a portion C in FIG. FIG. 5 is a cross-sectional view of the pipe showing a state of a crack generated in the pipe. FIG. 6 is a sectional view showing a pipe of the ultrasonic treatment apparatus according to the third embodiment of the present invention. FIG. 7 is a diagram illustrating amplitude and stress generated in a pipe according to a third embodiment of the present invention. FIG. 8 is an explanatory diagram for explaining a conventional technique. [Description of Signs] 1 vibrator 2 horn 3 10 pipe 4 protective film
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) A61B 18/00 A61B 17/22 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) A61B 18/00 A61B 17/22
Claims (1)
と、 前記超音波振動子に連結し、前記超音波振動子で発生さ
れた前記超音波振動を生体組織に伝達可能な管状に形成
された振動伝達部材と、 前記振動伝達部材の外表面にポリマー剤を塗布して硬化
形成させた、前記振動伝達部材の伸縮性より高い伸縮性
の第１の硬化膜層と、 前記振動伝達部材の内表面にポリマー剤を塗布して硬化
形成させた、前記振動伝達部材の伸縮性より高い伸縮性
の第２の硬化膜層と、 を具備したことを特徴とする超音波処置装置。(57) [Claim 1] An ultrasonic vibrator capable of generating ultrasonic vibration, and connected to the ultrasonic vibrator, wherein the ultrasonic vibration generated by the ultrasonic vibrator is generated. A vibration transmitting member formed in a tubular shape that can be transmitted to a biological tissue; and a first elastic member having a higher elasticity than the elastic member of the vibration transmitting member, which is formed by applying a polymer agent to an outer surface of the vibration transmitting member and curing the same. A cured film layer, and a second cured film layer having a higher elasticity than the elasticity of the vibration transmission member, which is formed by applying a polymer agent to the inner surface of the vibration transmission member and curing the same. Ultrasonic treatment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17218593A JP3386517B2 (en) | 1992-06-26 | 1993-06-18 | Ultrasonic treatment equipment |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19342392 | 1992-06-26 | ||
| JP4-193423 | 1992-06-26 | ||
| JP17218593A JP3386517B2 (en) | 1992-06-26 | 1993-06-18 | Ultrasonic treatment equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0670938A JPH0670938A (en) | 1994-03-15 |
| JP3386517B2 true JP3386517B2 (en) | 2003-03-17 |
Family
ID=26494633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17218593A Expired - Fee Related JP3386517B2 (en) | 1992-06-26 | 1993-06-18 | Ultrasonic treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3386517B2 (en) |
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-
1993
- 1993-06-18 JP JP17218593A patent/JP3386517B2/en not_active Expired - Fee Related
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