JP6824608B2 - 電流補償を伴う皮膚電気活動測定のための装置 - Google Patents
電流補償を伴う皮膚電気活動測定のための装置 Download PDFInfo
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- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
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Description
[0001]
本願は、2013年3月16日出願の「Apparatus for Electro Dermal Activity Measurement with Current Compensation」という名称の米国仮特許出願第61/802500号、及び、2013年3月16日出願の「Method for Estimating Human Well−being Through Heart Rate Variability」という名称の米国仮特許出願第61/802519号への、優先権及び利益を主張し、その開示は参照によりそれらの全文が本明細書に組み込まれている。
例えばシステム電源ON、システム電源OFF、システムのリセット、ユーザ挙動の詳細の手動入力、装置100利用の詳細の手動入力、及び/又は、装置100とリモート・デバイスとの間の通信の手動開始などの情報を、ユーザが線量測定システム100内に入力できるようにするための、例えばボタン、スイッチ、英数字キーパッド、及び/又はタッチ・スクリーンなどのユーザ入力インターフェースを含むことができる。
Iin=Iskin−Icomp
Claims (21)
- 皮膚電気活動を測定するための装置であって、
皮膚の角質層の第1の部分と接触するように構成された第1の電極と、
前記角質層の第2の部分と接触し前記角質層を介して前記第1の電極と電子的に連絡するように構成された第2の電極と、
前記第1の電極及び前記第2の電極に電気的に結合され、コンピュータ実行可能な命令を実行するように構成されたプロセッサであって、前記命令は、
(a)前記第1の電極に第1の電圧V+で及び前記第2の電極に第2の電圧V−でバイアスをかけること、
(b)補償電圧を動的に設定すること、
(c)前記第1の電極と前記第2の電極との間を流れる第1の電流を測定することであって、前記第1の電流は前記角質層のコンダクタンスに対応すること、
(d)前記第1の電流から補償電流を減じて第2の電流を得ることであって、前記補償電流は、前記プロセッサによって設定される前記補償電圧の準線形関数である、こと、
(e)前記第2の電流を増幅し、前記第2の電流を出力電圧に変換すること、
(f)前記出力電圧から、前記角質層のコンダクタンスを計算することであって、前記角質層のコンダクタンスは、前記皮膚電気活動の度合いを示す、こと、
(g)前記出力電圧が飽和値より大きいか否かを判定すること、及び、
(h)前記出力電圧が前記飽和値より大きいと判定したことに応答して、前記出力電圧の飽和を避けるように、前記補償電圧を増大させ、前記皮膚電気活動が持続性レベル及び一過性レベルで測定されるようにすること、
を含む、プロセッサと、
を備える装置。 - 前記プロセッサは、前記角質層の前記コンダクタンスが低すぎる場合、前記補償電圧を減少させるように更に構成される、請求項1に記載の装置。
- 前記出力電圧は、前記皮膚電気活動の一過性値を示す、請求項1に記載の装置。
- 前記プロセッサは、電気分解を低減するために、所定の期間後に前記第1の電極及び前記第2の電極のうちの少なくとも1つの極性を反転させるコンピュータ実行可能な命令を実行するように構成される、請求項1に記載の装置。
- 前記角質層は、ヒトの皮膚の任意の部分の角質層である、請求項1に記載の装置。
- 前記プロセッサによって計算される前記角質層のコンダクタンスは、0.05μSから50μSの範囲内の前記角質層の持続性レベル・コンダクタンスである、請求項5に記載の装置。
- 前記プロセッサは、0.0001μSの解像度で前記角質層の前記コンダクタンスを計算するように構成される、請求項1に記載の装置。
- 皮膚電気活動を測定するためのウェアラブル・デバイスであって、
ユーザの皮膚に取り外し可能に関連付けられるように構成されたハウジングと、
第1の電極であって、前記第1の電極の少なくとも一部が前記ハウジングの外側に配設され、前記ハウジングが前記ユーザに関連付けられた場合、皮膚の角質層の第1の部分と接するように構成される、第1の電極と、
第2の電極であって、前記第2の電極の少なくとも一部が前記ハウジングの外側に配設され、前記ハウジングが前記ユーザに関連付けられた場合、前記皮膚の前記角質層の第2の部分と接するように構成される、第2の電極と、
前記ハウジング内に配設され、前記第1の電極及び前記第2の電極に電気的に結合された処理モジュールであって、
(a)前記第1の電極に第1の電圧V+で及び前記第2の電極に第2の電圧V−でバイアスをかけること、
(b)補償電圧を動的に設定すること、
(c)前記第1の電極と前記第2の電極との間を流れる第1の電流を測定することであって、前記第1の電流は前記角質層のコンダクタンスに対応する、こと、
(d)前記第1の電流から補償電流を減じて第2の電流を得ることであって、前記補償電流は、前記処理モジュールによって設定される前記補償電圧の準線形関数である、こと、
(e)前記第2の電流を増幅し、前記第2の電流を出力電圧に変換すること、
(f)前記出力電圧から、前記角質層のコンダクタンスを計算することであって、前記角質層のコンダクタンスは、前記皮膚電気活動の度合いを示す、こと、
(g)前記出力電圧が飽和値より大きいか否かを判定すること、及び、
(h)前記出力電圧が前記飽和値より大きいと判定したことに応答して、前記出力電圧の飽和を避けるように、前記補償電圧を増大させ、前記皮膚電気活動が持続性レベル及び一過性レベルで測定されるようにすること、
を実行するように動作可能な、処理モジュールと、
前記ハウジング内に配設された通信モジュールであって、前記処理モジュールに結合され、前記ユーザの前記皮膚電気活動を表示するように、及び、皮膚電気活動データを前記処理モジュールから外部デバイスに通信するように、構成される、通信モジュールと、
前記ハウジング内に配設され前記処理モジュール及び前記通信モジュールに電力を提供するように構成される電源と、
を備える、ウェアラブル・デバイス。 - 前記処理モジュールは、前記角質層の前記コンダクタンスが低すぎる場合、前記補償電圧を減少させるように更に構成される、請求項8に記載のウェアラブル・デバイス。
- 前記ウェアラブル・デバイスは、リスト・バンドである、請求項9に記載のウェアラブル・デバイス。
- 前記処理モジュールによって計算される前記角質層のコンダクタンスは、0.05μSから50μSの範囲内の前記ユーザの手首の前記角質層の持続性レベル・コンダクタンスである、請求項10に記載のウェアラブル・デバイス。
- 前記ウェアラブル・デバイスは、ヘッド・バンド、アーム・バンド、フット・バンド、アンクル・バンド、及び指輪のうちの少なくとも1つである、請求項8に記載のウェアラブル・デバイス。
- 前記処理モジュールは、電気分解を大幅に低減するために、所定の期間後に、前記第1の電極及び前記第2の電極のうちの少なくとも1つの極性を反転させるように更に構成される、請求項8に記載のウェアラブル・デバイス。
- 心拍センサを更に備える、請求項8に記載のウェアラブル・デバイス。
- 加速度計、温度センサ、血中酸素センサ、及びグルコース・センサのうちの少なくとも1つを更に備える、請求項14に記載のウェアラブル・デバイス。
- 前記通信モジュールは、心拍データ、加速度計データ、温度データ、血中酸素データ、及びグルコース・データのうちの少なくとも1つを前記外部デバイスに送るように構成される、請求項15に記載のウェアラブル・デバイス。
- 前記通信モジュールは、USB、USB2.0、IEEE1394、BLUETOOTH(登録商標)、低電力BLUETOOTH(登録商標)、及びWi−Fiのうちの少なくとも1つを介して、前記外部デバイスと通信するように構成される、請求項16に記載のウェアラブル・デバイス。
- ユーザの角質層上に第1の電極及び第2の電極を配設することと、
前記第1の電極に第1の電圧で及び第2の電極に第2の電圧でバイアスをかけることと、
前記第1の電極と前記第2の電極との間を流れる第1の電流を測定することであって、前記第1の電流は、前記角質層のコンダクタンスに対応する、ことと、
前記第1の電流から補償電流を減じて第2の電流を得ることであって、前記補償電流は、デジタル対アナログ変換器が生成する補償電圧の準線形関数である、ことと、
前記第2の電流を増幅された出力電圧に変換することと、
前記増幅された出力電圧から、前記角質層のコンダクタンスを計算することと、
前記増幅された出力電圧をデジタル的に処理して前記増幅された出力電圧をデジタル信号に変換することと、
前記変換された増幅された出力電圧に基づいて、前記デジタル対アナログ変換器が生成する補償電圧を調節し、前記補償電流を調整すること、を含み、
前記デジタル対アナログ変換器が生成する補償電圧を調節することは、
前記出力電圧が飽和値より大きいか否かを判定すること、及び、
前記出力電圧が前記飽和値より大きいと判定したことに応答して、前記デジタル対アナログ変換器が生成する補償電圧を動的に設定することにより、前記出力電圧の飽和を避けるように、前記補償電流を調整し、前記皮膚電気活動が持続性レベル及び一過性レベルで測定されるようにすること、
を含む、皮膚電気活動を測定するための方法。 - 前記デジタル対アナログ変換器が生成する補償電圧を調節することは、前記角質層の前記コンダクタンスが低すぎる場合に、前記デジタル対アナログ変換器の電圧を下げること、
を更に含む、請求項18に記載の方法。 - 前記計算されたコンダクタンスは、0.05μSから50μSの範囲内の値を有する持続性レベル・コンダクタンスである、請求項19に記載の方法。
- 前記計算されたコンダクタンスは、0.0001μSまでの解像度を有する一過性レベル・コンダクタンスである、請求項19に記載の方法。
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