JPH08336545A - 超音波手術装置 - Google Patents
超音波手術装置Info
- Publication number
- JPH08336545A JPH08336545A JP7169333A JP16933395A JPH08336545A JP H08336545 A JPH08336545 A JP H08336545A JP 7169333 A JP7169333 A JP 7169333A JP 16933395 A JP16933395 A JP 16933395A JP H08336545 A JPH08336545 A JP H08336545A
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- Prior art keywords
- circuit
- ultrasonic
- horn
- frequency
- vibration
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Abstract
等における異常加熱の発生を防止することを目的とす
る。 【構成】 この発明は、超音波発振回路Eの出力に応じ
てメス部4aに機械的超音波振動を発生させるハンドピ
ース部Mと、このハンドピース部における超音波変換器
及びホーン4を冷却する冷却機構と、前記ハンドピース
部の振動系(電歪型振動子3,ホーン4)の振動周波数
を検出する周波数検出回路30と、前記周波数検出回路
によって検出された周波数が所定の周波数範囲外である
とき判別信号を出力する判別回路31と、前記判別回路
に接続され判別信号の受信時に超音波発振回路(安定化
電源回路23)の出力を低減または遮断する出力制御回
路(振幅レベル設定回路)32とを備える。
Description
るメス部によって生体組織の破砕・切断などを行うよう
にした超音波手術装置に関する。
レス刃や鋼刃等を形成した通常のメスの他に、超音波振
動によって手術部位の破砕・切断を行う、いわゆる超音
波メスが使用されている。
て高周波を発生させ、その高周波電力を図3に示すよう
なハンドピース部1によりメス部3aの機械的超音波振
動に変換するものとなっている。すなわち、図示のハン
ドピース部1には、その外郭をなす管状部材2内に図4
に示すような電歪型振動子3が内蔵され、これが管状部
材2から突出するホーン4に固定された構成となってい
る。この電歪型振動子3は、電歪素子3aとその両端に
取り付けた金属製の裏打ち板3b及び前面板3cとによ
り構成されており、図外の超音波発振回路から供給され
た高周波電力は、この電歪型振動子3で機械的振動に変
換され、その機械的振動はメス部であるホーン4の先端
部4aに伝達される。
ーションパイプ5が配設されており、ここから手術部位
に対して洗浄用の生理食塩水などが供給される一方、手
術部位に発生した血液や洗浄水などをホーン4の中心に
形成された吸引孔4bから吸引し、吸引パイプ6を介し
て排出されるようになっている。
用いられる電歪型振動子3にあっては、電気振動を機械
振動に変換する際に生じる電気的ロスによって熱が発生
し、これがホーン4の異常発熱や電歪素子3aの寿命低
下を招くため、一般には電歪型振動子3及びメス部(ホ
ーンの先端部)4aに対して冷却処理を施す必要があ
る。この冷却処理方法としては、電歪素子3a及びホー
ン4に対して冷却水などを供給することが従来より行わ
れているが、この場合には冷却水の供給機構を付設する
ことによりハンドピース1が大型化するため、現在で
は、図5に示すように、電歪型振動子3の中央部にホー
ン4の吸引孔4bと連通する吸引経路3dを形成し、こ
こに吸引孔4bから吸引した生理食塩水を通過させるこ
とによって電歪型振動子3を冷却するという冷却処理構
造も提案・実施されている。
音波手術装置では電歪型振動子3やホーン4に対して冷
却処理を施すようになっているが、冷却処理機構に何等
かの故障、例えば、イリゲーションパイプ5が詰まるこ
とによる冷却水の供給停止、ホーン4や吸引経路3dが
詰まることによる吸引動作の停止などが発生した場合に
は、電歪型振動子3やホーン4が高温化してしまい、患
者や手術者が火傷するとか、ホーン4や電歪素子3a等
が熱によって破損されるといった問題が生じる。
なされたもので、ハンドピース部の異常加熱等の発生を
防止することができる安全性及び耐久性に優れた超音波
メスの提供を目的とする。
回路の出力に応じてメス部に機械的超音波振動を発生さ
せるハンドピース部と、このハンドピース部における電
歪型振動子とホーンとからなる振動系を冷却する冷却機
構と、前記振動系の振動周波数を検出する周波数検出回
路と、前記周波数検出回路によって検出された周波数が
所定の周波数範囲外であるとき判別信号を出力する判別
回路と、前記判別回路に接続され判別信号の受信時に超
音波発振回路の出力を低減または遮断する出力制御回路
とを備えたものである。
に告知手段を駆動して警告を手術者等に発するようにし
ても良く、この場合の告知手段としては音声発生装置や
表示器などを用いることが考えられる。
原因によって停止すると、振動系の温度は上昇し始める
が、この発明では、温度変化に伴って振動系の固有振動
数が変化することに着目し、振動系の周波数を周波数検
出回路によって検出し、その検出周波数が予め設定した
適正周波数範囲外であるときには、判別回路から判別信
号を出力し、その判別信号に応じて出力制御回路手段が
超音波発振回路の出力を低減または遮断する。これによ
り、振動系及びホーンにおける発熱は抑えられ、これら
が異常に加熱されることはなくなる。
判別信号によって音声発生装置や表示器等の告知手段を
作動させるようにすれば、手術者等に装置の使用停止を
促すことができ、事故の発生を未然に防ぐことができ
る。
基づき説明する。この実施例における超音波手術装置と
しては、図1に示すように、高周波電力を発生させる超
音波発振回路Eと、この超音波発振回路Eから出力され
た高周波電力をメス部の機械的振動エネルギーに変換す
るハンドピース部Mとからなり、ハンドピース部Mは上
記従来技術に示したものと同様に、管体2,電歪型振動
子3,ホーン4及びイリゲーションパイプ6等を備えた
ものとなっている。但し、ここに用いる電歪型振動子3
は、図4に示すように内部に吸引孔4bを形成したもの
を用いている。従って、この実施例におけるホーン及び
電歪型振動子3に対する冷却機構は、生理食塩水を供給
するイリゲーションパイプ6と、ホーン4の吸引孔4b
及びこれに連通する吸引経路4bとにより構成されてい
る。
すように構成されている。図中、aは電源回路であり、
この電源回路において、21は所定の商用電源20から
供給された交流電圧を整流する整流回路、22はこの整
流回路から出力された直流電圧に含まれる脈流を低減す
る平滑回路、23は前記平滑回路の出力を振幅レベル設
定回路32の信号に応じて安定した電圧に変える安定化
電源回路である。
回路29と共に増幅部bを構成する電力増幅回路、25
は前記整合部cとしての整合回路兼振幅調整回路であ
る。この整合回路兼振幅調整回路25は、前述のハンド
ピース部Mにおける電歪型振動子3に対し低損失で高周
波電力を投入し得ると共に、電歪型振動子3を安定動作
させるために適正な駆動振幅を保つようになっており、
メス部(ホーン4の先端部)4aにかかる負荷の増減に
対しメス部4aの振動を一定に保つようになっている。
らの出力を帰還信号として前記増幅部bへ正帰還させる
帰還部である。この帰還部dは、前記帰還信号に含まれ
る電歪型振動子3のスプリアス周波数成分を除去する帰
還信号フィルター26と、帰還回路のQを調整する帰還
信号Q回路27と、この帰還信号Q回路27から出力さ
れた帰還信号をトランジスタドライブ回路29及び制御
部eへと出力する帰還信号検出回路28とよりなる。
17から出力された帰還信号の周波数に基づき告知手段
等の駆動を制御するものであり、帰還信号の周波数を検
出する周波数検出回路30と、帰還信号の周波数が予め
設定した周波数範囲内であるか否かを判別する判別回路
31と、この判別回路31から出力される判別結果に応
じて安定化電源回路23における出力の振幅レベルを設
定する出力制御回路としての振幅レベル設定回路32
と、告知手段の駆動を制御する駆動制御回路33とから
なる。また、前記制御部eによって制御される告知手段
fは、所定の音声信号を出力する音声発生回路34とこ
の音声発生回路34からの出力に応じて音声を発するス
ピーカ35とからなる。
手術装置は、電源部a、増幅部b、整合部c、帰還部
d、及び制御部e及び告知手段fなどからなる超音波発
振回路Eを有しており、この回路Eでは、トランジスタ
ドライブ回路29から供給された信号を、増幅部bにて
増幅した後、その信号を整合部c及び帰還部dを介して
増幅部dへと正帰還させることにより電気的超音波振動
を発生させ、さらにその電気的超音波振動を整合部cを
介してハンドピース部1の電歪型振動子3に投入するこ
とにより高周波電力を機械的振動エネルギーへと変換
し、その機械振動エネルギーをホーン4へと伝達する。
これにより、ホーン4の先端部4aは、所定の振幅で超
音波振動を行い、生体組織等の切断を行うメス部として
作用する。
なる振動系には、振動変換動作に伴って発熱を生じる
が、ハンドピース部Mに設けられた冷却機構が適正に作
動している場合には、電歪型振動子3及びホーン4が高
温化することはなく、手術者や患者に対して安全に使用
することができる。但し、冷却機構は生理食塩水の供給
パイプ5や吸引経路3dが詰まるなどして動作不能状態
に陥ることもあり、このよう場合に、従来の装置では電
歪型振動子3及びホーン4の温度が異常に高まり極めて
危険な状態となるが、この実施例においては冷却機構の
動作不良が発生した場合にも、電歪型振動子3及びホー
ン4が異常に加熱されるのを抑えることができる。
型振動子3及びホーン4の温度が適正温度から上昇し始
めると、その上昇に従って、ホーン4と電歪型振動子3
とからなる振動系の固有振動数も低下し始める。この固
有振動数は、制御部eにおける周波数検出回路30によ
って検出されており、その検出周波数が予め設定した周
波数範囲を越えた場合には、判別回路31から異常を表
す判別信号が出力され、これが振幅レベル設定回路32
及び駆動制御回路33に入力される。
前記判別信号出力前に設定されていた振幅レベルより低
い振幅レベルに安定化電源回路23の出力を設定する。
その結果、増幅部b及び整合部cを介してハンドピース
部Mの電歪型振動子3に投入される高周波電力は低下す
るため、電歪型振動子3及びホーン4における超音波出
力も低下し、それに伴って発熱も低減される。従って、
手術者や手術部位が高温化したハンドピース部Mによっ
て火傷するといった危険性を完全に排除することができ
る共に、装置の構成部品の破損、または性能劣化等を防
止することもできる。
ル変更動作に加え、この実施例においては、判別信号を
受けた駆動制御回路33が音声発生回路34を駆動して
スピーカ35から警告音を発生させるようになってい
る。このため手術者は、超音波手術装置の動作不良の発
生を、警告音によって直ちに認識することができる。
して安全に使用できる固有振動数の範囲F1は、適正状
態における固有振動数をFとすると、例えば、(F−
0.01F)<F1<(F+0.01F)となる。従っ
て、上記判別回路31は上記範囲外の検出周波数が入力
された場合に判別信号を出力するものとなっている。但
し、ここに示す範囲は一例であり、使用する振動系に応
じて種々異なるものとなる。
振動数の変動は、上記のような冷却機構の動作不良によ
り異常加熱が発生した場合だけでなく、構成部品に亀裂
が生じた場合、例えば、ホーン4に亀裂が生じた場合な
どにも発生する。このため警告音の発生時において、冷
却装置が適正に作動していれば、ハンドピース部4等に
何等かの故障が発生しているとの判断を下すことができ
る。すなわち、この実施例における装置は故障検出機能
をも有することとなる。
回路30を帰還信号検出回路28に接続して帰還信号周
波数を検出するようにしたが、周波数検出回路30は、
整合回路兼振幅調整回路25、帰還フィルター26,帰
還信号Q回路27,トランジスタドライブ回路29など
の出力に接続しても、上記実施例と同様に周波数の検出
を行うことができる。
出力された判別信号に応じて、振幅レベル設定回路32
が安定化電源回路23の振幅レベルを低減させるものと
なっているが、安定化電源回路23の出力停止、また
は、その他の回路部分の遮断などを行うことにより、ハ
ンドピース部Mに対して高周波電力の供給を完全に遮断
しても良い。
記実施例のように音声を発生するものに限らず、表示器
などを用い、これによって温度の異常な上昇などをはじ
めとする種々の故障の発生を警告表示するようにしても
良い。また、超音波手術装置に対し、告知手段fと出力
制御回路32のうち、いずれか一方のみを設けても良
く、この場合にも安全性は従来の装置に比べて大幅に向
上する。
音波手術装置は、ハンドピース部において冷却機構やそ
の他の構成部品に故障が発生した場合には、これを検出
して超音波発振回路の出力を低下または停止させるよう
になっているため、ハンドピース部が異常加熱される危
険性もなくなり、手術者及び患者に対する安全性を十分
に確保することができる。また、ハンドピース部の高温
化を防止し得るようにしたため、振動系等の構成部品が
熱により破損するのを防止することができ、装置の耐久
性は大幅に向上する。
知手段を作動させるようにすれば、故障の発生を手術者
などに直ちに認識させることができ、事故の発生を未然
に防止することができる。
してハンドピース部の構成を示す。
すブロック図である。
を示す側面図である。
型振動子を示す側面図である。
Claims (4)
- 【請求項1】 超音波発振回路からの高周波電力に応じ
てメス部に超音波振動を発生させるハンドピース部を備
え、前記メス部の超音波振動によって生体組織などの破
砕・切断を行うようにした超音波手術装置であって、 前記ハンドピース部は、 先端部をメス部とするホーンと、 前記ホーンに接続され、超音波発振回路から出力される
高周波電力を機械的超音波振動に変換し、その機械的振
動をホーンの先端部に伝達する電歪型振動子と、 この電歪型振動子とホーンとからなる振動系を冷却する
冷却機構と、を備えると共に、 前記超音波発振回路には、 前記振動系の振動周波数を検出する周波数検出回路と、 前記周波数検出回路によって検出された周波数が所定の
周波数範囲外であるとき所定の判別信号を出力する判別
回路と、 前記判別回路に接続され、判別信号の受信時に超音波発
振回路の出力を低減または遮断する出力制御回路とを設
けることを特徴とする超音波手術装置。 - 【請求項2】 超音波発振回路からの高周波電力に応じ
てメス部に超音波振動を発生させるハンドピース部を備
え、前記メス部の超音波振動によって生体組織などの破
砕・切断を行うようにした超音波手術装置であって、 前記ハンドピース部は、 先端部をメス部とするホーンと、 前記ホーンに接続され、超音波発振回路から出力される
高周波電力を機械的超音波振動に変換し、その機械的振
動をホーンの先端部に伝達する電歪型振動子と、 この電歪型振動子とホーンとからなる振動系を冷却する
冷却機構と、を備えると共に、 前記超音波発振回路には、 前記振動系の振動周波数を検出する周波数検出回路と、 前記周波数検出回路によって検出された周波数が所定の
周波数範囲外であるとき所定の判別信号を出力する判別
回路と、 駆動状態において前記ハンドピース部の異常を告知する
告知手段と、 前記判別回路に接続され、判別信号の受信時に前記告知
手段を駆動する駆動制御回路とを設けることを特徴とす
る超音波手術装置。 - 【請求項3】 告知手段は、所定の警告音を発生させる
音声発生装置により構成されることを特徴とする請求項
2記載の超音波手術装置。 - 【請求項4】 告知手段は、所定の警告表示を行う表示
器により構成されることを特徴とする請求項2記載の超
音波手術装置。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16933395A JP4219418B2 (ja) | 1995-06-13 | 1995-06-13 | 超音波手術装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16933395A JP4219418B2 (ja) | 1995-06-13 | 1995-06-13 | 超音波手術装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08336545A true JPH08336545A (ja) | 1996-12-24 |
| JP4219418B2 JP4219418B2 (ja) | 2009-02-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16933395A Expired - Lifetime JP4219418B2 (ja) | 1995-06-13 | 1995-06-13 | 超音波手術装置 |
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| Country | Link |
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| JP (1) | JP4219418B2 (ja) |
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