JP2023011748A - 動的漏洩電流補償および動的rf片長を含む電気手術装置 - Google Patents
動的漏洩電流補償および動的rf片長を含む電気手術装置 Download PDFInfo
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Abstract
Description
本出願は、内容全体が参照により本明細書に組み入れられる、「電気手術装置」と題する、2016年11月17日出願の米国仮特許出願第62/423,379号に対する優先権を主張する。
以下に示される表1は、動的漏洩電流補償および動的RFモジュラーのアルゴリズムまたは機能を実施するために使用される出力プッシュプル発生器のためのRFパラメータを含む。プッシュプル発生器は、出力変圧器275、276を駆動する電力増幅器段274であることを理解されたい。
ESU223が高出力電圧(例えば400Vrms超)または高出力電流(例えば1Arms超)で動作しているとき、ESU223に結合された電気手術アプリケータ310の付属品ケーブル260のインピーダンス特性を、出力電力を供給するときに考慮に入れなければならない。考慮すべきインピーダンス特性は、ケーブル260内のワイヤの直列抵抗およびインダクタンスと、アースおよび中性電極292に対する並列浮遊容量とを含む。Jプラズマモードの場合(例えば、変圧器組立体220などの内部変圧器を含む電気手術アプリケータが使用される場合)、高い出力電圧(最大900Vrms)および最大20kΩの出力インピーダンスが存在する。さらに、動作RF周波数の付属品インピーダンス値は、出力負荷に近いか、またはそれ以下になり、すなわち336kHzで長さ2.4mのケーブルで測定されたインピーダンスは、6300Ω~7200Ωの間である(この測定は、接地基準モードの付属品に負荷が取り付けられていない場合である)。
i LEAKAGE=(u ESU-u LEADS)/ZLEAKAGE (1)
i LOAD=i ESU-i LEAKAGE (2)
u LEADS=i ESU-ZLEADS (3)
u LOAD=u ESU-u LEADS (4)
i LEAKAGE=u ESU/ZLEAKAGE (5)
i LKG=f(u ESU,ZESU)
=u ESU/ZLEAKAGE(ZESU) (6)
ここで、ZLEAKAGEは、ZESUの関数である。ZESUが増大していくと、ZLEAKAGEは減少していく。
ZESU=ZLEAKAGE×ZLOAD/(ZLEAKAGE+ZLOAD) (7)
そして、漏洩インピーダンスは:
ZLEAKAGE=ZLOAD×ZESU/(ZLOAD-ZESU) (8)
i LOAD=i ESU-u ESU/ZLEAKAGE(ZESU) (9)
図12Aを参照すると、動的漏洩電流補償のアルゴリズムまたは機能が、本開示による方法800として示される。一実施形態では、動的漏洩電流補償のアルゴリズムまたは機能は、コントローラ277によって実行されて、電源272により出力される電力、したがって患者または負荷に供給される電気手術エネルギーの電力を制御することができることを理解されたい。さらに、一実施形態では、コントローラ277は、コントローラ277内部のシステムクロックの各立上りで方法800の各ステップを並列に実行することを理解されたい。
ESU223のコントローラ277は、また、本開示の動的RF変調のアルゴリズムまたは機能を実行し、ESU223内のRFプッシュプルドライバまたは発振器273を制御して、所望の波高率を有する、負荷または患者への電力信号または電気手術エネルギーを供給するように構成されてもよい。動的RF変調のアルゴリズムまたは機能は、コントローラ277がアプリケータ310などの電気手術アプリケータのRF出力のいくつかのパラメータを制御することを可能にするように構成される。パラメータは、
・周波数(1/Period)
・プッシュプルパルス間のデッドタイム*
・1変調周期内のRFパルス数(NumberOfPulses)
・各変調サイクル間のオフタイム(OffTime)
を含む。
ModulationFrequency
=1/(Period×NumberOfPulses+OffTime) (10)
DutyCycle
=Period×NumberOfPulses/(Period×NumberOfPulses+OffTime) (11)
図17および図18を参照すると、グラフ1200およびグラフ1300が本開示によって示される。
Claims (9)
- 電気手術エネルギーを出力するように構成された電力発生器回路と、
ケーブルを介して電気手術アプリケータに結合され、前記電気手術エネルギーを負荷に供給する前記電気手術アプリケータに前記電気手術エネルギーを供給するように構成された能動端子と、
前記負荷に印加された前記電気手術エネルギーのための戻り経路を提供するように構成された戻り端子と、
前記能動端子および前記戻り端子に結合され、前記能動端子および前記戻り端子において前記電気手術エネルギーを電圧データおよび電流データについてサンプリングするように構成されたセンサと、
前記電力発生器回路を制御するように構成されたコントローラと、
を備え、
前記コントローラは、
前記サンプリングされた電圧データおよび電流データに基づいて、前記能動端子および前記戻り端子におけるインピーダンスを決定し、
前記能動端子および前記戻り端子における前記インピーダンスに基づいて、前記電力発生器回路によって出力される前記電気手術エネルギーの変調周波数を決定し、
前記計算された変調周波数を有するように、前記電力発生器回路によって出力される前記電気手術エネルギーを調整する、
電気手術発電機。 - 前記コントローラは、
前記サンプリングされた電圧データに基づいて、前記能動端子と前記戻り端子との間の二乗平均平方根(RMS)電圧を決定するように構成され、
前記サンプリングされた電流データに基づいて、前記能動端子における前記電気手術エネルギーの出力RMS電流を決定するように構成される、
請求項1に記載の電気手術発電機。 - 前記コントローラは、前記サンプリングされた電圧データに対する移動平均RMSを計算し、かつ、前記サンプリングされた電圧に対する前記移動平均RMSを電圧スケーリング係数によってスケーリングすることによって、前記RMS電圧を決定するように構成され、
前記コントローラは、前記サンプリングされた電流データに対する移動平均RMSを計算し、かつ、前記サンプリングされた電流データに対する前記移動平均RMSを電流スケーリング係数によってスケーリングすることによって、前記RMS電流を決定するように構成される、
請求項2に記載の電気手術発電機。 - 前記コントローラは、前記決定されたRMS電圧を前記決定されたRMS電流で除算することによって、前記能動端子および前記戻り端子におけるインピーダンスを決定するように構成される、
請求項3に記載の電気手術発電機。 - 前記変調周波数は、前記電力発生器回路によって出力される前記電気手術エネルギーのオフタイムに基づいて決定される、
請求項1に記載の電気手術発電機。 - ルックアップテーブルを含むメモリをさらに備え、
前記ルックアップテーブルは、前記能動端子および前記戻り端子におけるインピーダンスの変調周波数の各値を含み、
前記コントローラは、前記能動端子および前記戻り端子における前記決定されたインピーダンスに対応するオフタイムの値を読み出すことによって、前記オフタイムを決定するように構成される、
請求項5に記載の電気手術発電機。 - 前記変調周波数は、以下の式
ModulationFrequency
=1/(Period×NumberOfPulses+OffTime)
に従って前記コントローラによって決定され、
前記式におけるPeriodおよびNumberOfPulsesは、前記電気手術エネルギーの変調サイクルに対応し、前記電気手術発電機のメモリに保存された所定の値である、
請求項5に記載の電気手術発電機。 - 前記コントローラは、前記決定および前記調整を周期的に実行するように構成され、前記電力発生器回路によって出力される前記電気手術エネルギーの前記変調周波数を動的に調節する、
請求項1に記載の電気手術発電機。 - 前記コントローラは、さらに、
前記能動端子および前記戻り端子における前記インピーダンスに基づいて、前記電気手術アプリケータおよび前記ケーブルに関連する漏洩電流を決定し、決定された漏洩電流に基づいて、前記電気手術アプリケータによって前記負荷に供給される前記電気手術エネルギーの電力レベルを決定するように構成され、
前記負荷に供給された前記電気手術エネルギーの前記電力レベルが所定の電力レベルと一致しないと決定されると、前記電力発生器回路によって出力される前記電気手術エネルギーを前記所定の電力レベルと一致するように調整するように構成される、
請求項1に記載の電気手術発電機。
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PCT/US2017/062195 WO2018094159A1 (en) | 2016-11-17 | 2017-11-17 | Electrosurgical apparatus with dynamic leakage current compensation and dynamic rf modulation |
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