JP2002186901A - 超音波手術装置 - Google Patents

超音波手術装置

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Publication number
JP2002186901A
JP2002186901A JP2000389387A JP2000389387A JP2002186901A JP 2002186901 A JP2002186901 A JP 2002186901A JP 2000389387 A JP2000389387 A JP 2000389387A JP 2000389387 A JP2000389387 A JP 2000389387A JP 2002186901 A JP2002186901 A JP 2002186901A
Authority
JP
Japan
Prior art keywords
frequency
ultrasonic
output
monitoring
handpiece
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.)
Pending
Application number
JP2000389387A
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English (en)
Other versions
JP2002186901A5 (ja
Inventor
裕之 ▲高▼橋
Hiroyuki Takahashi
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 Optical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP2000389387A priority Critical patent/JP2002186901A/ja
Priority to US09/774,920 priority patent/US6569109B2/en
Priority to US10/414,984 priority patent/US6761690B2/en
Publication of JP2002186901A publication Critical patent/JP2002186901A/ja
Priority to US10/774,914 priority patent/US7270646B2/en
Publication of JP2002186901A5 publication Critical patent/JP2002186901A5/ja
Pending legal-status Critical Current

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  • Surgical Instruments (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

(57)【要約】 【課題】 複数の処置具に対し、処置具毎に共振周波数
に対応した周波数範囲で、容易に出力周波数監視を行
う。 【解決手段】 DDS11はCPU10より設定周波数
を読み込む。設定周波数情報を読込んだ後、DDS11
はその情報を基に監視周波数範囲を演算する。設定周波
数に応じた正弦波を増幅部12に出力する。その後、D
DS11は設定周波数と出力周波数の差分を演算し、周
波数偏差を求める。そして、DDS11は演算された周
波数偏差を監視周波数と比較する。

Description

【発明の詳細な説明】
【0001】
【発明の属する技術分野】本発明は生体組織を超音波振
動により処置する超音波手術装置に関する。
【0002】
【従来の技術】超音波変換器を用いる装置は、従来種々
提案されており、例えば、外科用超音波メス、超音波洗
浄器、超音波加工装置等が知られている。このような超
音波装置に使用されている超音波変換器は、効率を高め
るために、その共振周波数で駆動するのが望ましいが、
共振周波数は負荷条件や温度によって変動する。
【0003】このようなことから、従来、例えば超音波
変換器の駆動電圧と駆動電流あるいは振動速度検出信号
との位相差を検出し、その出力に基づいて超音波変換器
の駆動周波数を制御する、アナログ回路で構成された、
いわゆるフェーズロックループ(PLL)方式の共振点
追尾回路を用いるものが提案されている。
【0004】例えば特開平7−313937号公報で
は、超音波振動子の駆動装置において、駆動周波数が所
定の範囲にあるか否かを確認して、異常の場合には、駆
動を停止するとともに異常を告知する方法が開示されて
おり、出力周波数を監視する手段として、位相比較から
の出力をチャージポンプでアナログ信号に変化し、その
信号をフィルタで高調波ノイズを除去して、ウインドウ
コンパレータでアナログ的に比較監視を行なっている。
【0005】
【発明が解決しようとする課題】しかしながら、近年の
超音波手術装置においては、処置具の使用目的に応じて
複数の処置具が存在しているが、上記特開平7−313
937号公報の監視方法は、基本的に1つの出力周波数
を仮定しており、複数の出力周波数は対応できない、ま
たは複数のウインドウコンパレータを並列に設ける必要
があるといった問題がある。
【0006】つまり、このような場合、従来例のように
アナログ信号により、出力周波数を監視していたので
は、回路規模の増大、拡張性に欠けたものとなり、複数
の処置具に対して対応できない問題がある。
【0007】本発明は、上記事情に鑑みてなされたもの
であり、複数の処置具に対し、処置具毎に共振周波数に
対応した周波数範囲で、容易に出力周波数監視を行うこ
とのできる超音波手術装置を提供することを目的として
いる。
【0008】
【課題を解決するための手段】本発明の超音波手術装置
は、デジタル周波数データを入力する入力部を有し前記
デジタル周波数データに基づき超音波振動子を駆動する
駆動信号を発振する超音波駆動信号発振手段と、前記超
音波振動子に供給される前記駆動信号に基づき前記デジ
タル周波数データを前記超音波振動子の共振周波数に設
定する共振周波数設定手段と、前記共振周波数設定手段
で設定された前記デジタル周波数データに基づき前記超
音波振動子の駆動状態を監視する監視手段とを備えて構
成される。
【0009】
【発明の実施の形態】以下、図面を参照しながら本発明
の実施の形態について述べる。
【0010】図1ないし図3は本発明の一実施の形態に
係わり、図1は超音波手術装置の構成を示す構成図、図
2は図1の装置本体の構成を示すブロック図、図3は図
2の装置本体の作用を説明するフローチャートである。
【0011】本実施の形態の超音波手術装置1は、装置
本体2と、生体組織を超音波振動により処置する例えば
2種類のハンドピース3及びハンドピース4と、フット
スイッチ5とから構成され、超音波手術装置1の装置本
体2からのハンドピース3、ハンドピース4への高周波
電力の出力制御は、フットスイッチ5の出力ペダルによ
り、出力のオン・オフ制御が行なえるようになってい
る。
【0012】ハンドピース3、4は代表的な超音波手術
装置1の処置具であって、例えば、ハンドピース3は、
47KHzの共振周波数を持つハンドピースで、周波数
が比較的高いことから、ハンドピースを細くできる。ハ
ンドピース4は、23.5KHzの共振周波数を持つハ
ンドピースで、周波数が比較的低いことから、ハンドピ
ースが大きい反面、組織を把持する部分を太く、長くで
きる長所を有している。
【0013】このように、超音波手術装置1の処置具に
おいては 、各種処置に応じて、複数のハンドピースを
使用することが要望されており、そのため、超音波手術
装置1は、複数の出力周波数制御を行なうことが要求さ
れている。
【0014】次に、本願の特徴である、超音波手術装置
1の装置本体2の内部構成について、図2を用いて説明
する。
【0015】本構成は、出力周波数の監視に必要な構成
のみを図示しており、超音波手術装置に必要な他のすべ
ての構成は公知であるので説明は省略する。
【0016】図2に示すように、装置本体2では、CP
U10は、出力周波数情報をDDS11に送信する。D
DS11では、CPU10からの出力周波数情報に基づ
き、その周波数の正弦波を増幅部12に出力する。ま
た、CPU10から設定出力(電流)情報が、増幅部1
2に出力する。
【0017】増幅部12では、DDS11からの正弦波
を設定出力まで増幅し、出力検出部13を介して、ハン
ドピース3(あるいはハンドピース4)に超音波出力を
伝える。
【0018】ハンドピース3(あるいはハンドピース
4)は上述したように固有の共振周波数を持ち、それ以
外の周波数で駆動すると、電流と電圧の位相が一致しな
い。
【0019】出力検出部13では、電圧と電流の位相を
検出し、その情報を位相比較器14に出力する。
【0020】位相比較器14では、出力検出部13によ
り検出された電圧位相と電流位相を比較し、その結果を
UP/DOWNカウンタ15に出力する。
【0021】UP/DOWNカウンタ15では、比較結
果を基に、周波数の増減情報をDDS11に出力する。
【0022】このようにして、ハンドピース3(あるい
はハンドピース4)の共振周波数に出力周波数が一致す
るように、共振周波数追尾を行なうと伴に、設定出力
(電流)になるように、増幅率を変化させ、超音波手術
を実現する。
【0023】また、図2の破線で囲んだ部分は、従来技
術でアナログPLL部分に相当する構成であり、デジタ
ルPLL21により構成されており、デジタルPLL2
1は、通常、高速処理を要求されることから、高速なデ
バイスである、DSP、FPGA等のプログラマブルデ
バイスが用いられる。
【0024】次に、出力周波数の監視手段について、図
3のフローチャートを用いて説明する。ここでは、DD
S11の内部に監視手段を設けることを前提として説明
する。
【0025】はじめに、DDS11はステップS1でC
PU10より設定周波数を読み込む。ここで、設定周波
数は、通常、図示していないが、ハンドピース3(ある
いはハンドピース4)内部に識別抵抗が付設され、この
値を定電流回路により、電圧信号として読み込むこと
で、CPU10はハンドピース3(あるいはハンドピー
ス4)の共振周波数を認識する。
【0026】また、認識方法は、ハンドピース3(あるい
はハンドピース4)内部に識別用のメモリが内臓されて
おり、その情報をCPU10が通信により読み込んでも
よい。
【0027】上記、設定周波数情報を読込んだ後、DD
S11は、ステップS2でその情報を基に監視周波数範
囲を演算する。例えば、共振周波l数が47KHzのハ
ンドピース3であれば±2.35KHz、共振周波数が
23.5KHzのハンドピース4であれば±1.175
KHzのように決定する。ここで、共振周波数が高い方
が、周波数の監視範囲が広いのは、高い共振周波数を持
つハンドピースの方が製造加工のばらつきにより、より
共振周波数がばらつくためである。
【0028】上記、監視周波数範囲を演算した後、DD
S11はステップS3で設定周波数に応じた正弦波を出
力する。
【0029】その後、ステップS4で設定周波数と出力
周波数の差分を演算し、周波数偏差を求める。ここで、
出力周波数は、UP/DOWNカウンタ15によりDD
S11の出力周波数が変化するが、そのDDS11の出
力周波数を意味する。
【0030】ステップS5で演算された周波数偏差を上
記監視周波数と比較し、もし監視周波数範囲内であれ
ば、正弦波出力のステップS3に戻り、上記と同じフロ
ーを繰り返し制御する。
【0031】また、もし監視周波数範囲外であれば、ス
テップS6で異常と認識し、出力と停止すると伴に、警
告を表示、表音する。
【0032】このような制御は、デジタルPLL21を
用いることで、リアルタイムで出力周波数を認識、監視
周波数範囲と比較、各ハンドピースの共振周波数に応じ
て前記監視周波数を可変できるものである。
【0033】上記実施の形態では、DDS11で監視周
波数範囲内にあるか否か判別していたが、これは、CP
U10で実施しても同様の効果が得られる。このときに
フローの違いは、出力周波数情報をDDS11からCP
U10に送信することで、CPU10内部で設定周波数
と比較、監視することで実現できる。この場合の違い
は、その監視処理を、DDS11で実施するか、CPU
10で実施するかの違いであり、両方法ともデジタル処
理しているため、その難易度に違いはなく、負荷をDD
S11に持たせるか、CPU10に持たせるかといっ
た、負荷分散の度合いで決定される。
【0034】本願の構成にすることで、異なる共振周波
数のハンドピースに対しても、容易に出力周波数との偏
差を演算し、異常を監視できる。
【0035】
【発明の効果】以上説明したように本発明によれば、複
数の処置具に対し、処置具毎に共振周波数に対応した周
波数範囲で、容易に出力周波数監視を行うことができる
という効果がある。
【図面の簡単な説明】
【図1】本発明の一実施の形態に係る超音波手術装置の
構成を示す構成図
【図2】図1の装置本体の構成を示すブロック図
【図3】図2の装置本体の作用を説明するフローチャー
【符号の説明】 1…超音波手術装置 2…装置本体 3,4…ハンドピース 5…フットスイッチ 10…CPU 11…DDS 12…増幅部 13…出力検出部 14…位相比較器 15…UP/DOWNカウンタ 21…デジタルPLL

Claims (2)

    【特許請求の範囲】
  1. 【請求項1】 デジタル周波数データを入力する入力部
    を有し、前記デジタル周波数データに基づき超音波振動
    子を駆動する駆動信号を発振する超音波駆動信号発振手
    段と、 前記超音波振動子に供給される前記駆動信号に基づき、
    前記デジタル周波数データを前記超音波振動子の共振周
    波数に設定する共振周波数設定手段と、 前記共振周波数設定手段で設定された前記デジタル周波
    数データに基づき、前記超音波振動子の駆動状態を監視
    する監視手段とを備えたことを特徴とする超音波手術装
    置。
  2. 【請求項2】 超音波振動する超音波振動子を有し、前
    記超音波振動によって生体を処置するハンドピースと、 デジタル周波数データを入力する入力部を有し、前記デ
    ジタル周波数データに基づき超音波振動子を駆動する駆
    動信号を発振する超音波駆動信号発振手段と、 前記超音波振動子に供給される前記駆動信号に基づき、
    前記デジタル周波数データを前記超音波振動子の共振周
    波数に設定する共振周波数設定手段と、 前記ハンドピースに応じて前記共振周波数設定手段で設
    定された前記デジタル周波数データを監視する監視手段
    とを備えたことを特徴とする超音波手術装置。
JP2000389387A 2000-02-04 2000-12-21 超音波手術装置 Pending JP2002186901A (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2000389387A JP2002186901A (ja) 2000-12-21 2000-12-21 超音波手術装置
US09/774,920 US6569109B2 (en) 2000-02-04 2001-01-31 Ultrasonic operation apparatus for performing follow-up control of resonance frequency drive of ultrasonic oscillator by digital PLL system using DDS (direct digital synthesizer)
US10/414,984 US6761690B2 (en) 2000-02-04 2001-06-18 Ultrasonic operation apparatus for performing follow-up control of resonance frequency drive of ultrasonic oscillator by digital PLL system using DDS (direct digital synthesizer)
US10/774,914 US7270646B2 (en) 2000-02-04 2004-02-09 Ultrasonic operation apparatus for performing follow-up control of resonance frequency drive of ultrasonic oscillator by digital PLL system using DDS (direct digital synthesizer)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000389387A JP2002186901A (ja) 2000-12-21 2000-12-21 超音波手術装置

Publications (2)

Publication Number Publication Date
JP2002186901A true JP2002186901A (ja) 2002-07-02
JP2002186901A5 JP2002186901A5 (ja) 2005-02-17

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Country Status (1)

Country Link
JP (1) JP2002186901A (ja)

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US11937863B2 (en) 2019-12-30 2024-03-26 Cilag Gmbh International Deflectable electrode with variable compression bias along the length of the deflectable electrode

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