JP6656633B2 - 生体信号が表す情報を識別するためのシステム - Google Patents
生体信号が表す情報を識別するためのシステム Download PDFInfo
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- JP6656633B2 JP6656633B2 JP2019523894A JP2019523894A JP6656633B2 JP 6656633 B2 JP6656633 B2 JP 6656633B2 JP 2019523894 A JP2019523894 A JP 2019523894A JP 2019523894 A JP2019523894 A JP 2019523894A JP 6656633 B2 JP6656633 B2 JP 6656633B2
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Description
生体信号が表す情報を識別するためのシステムであって、前記システムは、
生体信号を検出する検出手段と、
前記検出された生体信号を解析して特徴データを出力する解析手段と、
前記特徴データと、複数の教示データのうちの各々との類似度を決定する第1の決定手段と、
前記類似度を時刻ごとに時系列に記憶する記憶手段と、
前記記憶手段に記憶された時系列の類似度における所定期間内の複数の類似度に基づいて、前記生体信号が表す情報を決定する第2の決定手段と
を備える、システム。
前記第2の決定手段は、
前記所定期間内の複数の類似度に基づいて前記複数の教示データごとに演算値を算出することと、
前記演算値のうち最も高い演算値に対応する教示データを抽出し、抽出された前記教示データが示す情報を、前記生体信号が表す情報として決定する、項目1に記載のシステム。
前記第2の決定手段は、
前記所定期間内の複数の類似度に基づいて前記複数の教示データごとに演算値を算出することと、
前記演算値のうち所定の閾値を超える演算値に対応する少なくとも1つの教示データを抽出し、抽出された前記教示データが示す情報を、前記生体信号が表す情報として決定する、項目1に記載のシステム。
前記第2の決定手段は、前記演算値のうち所定の閾値を超える演算値に対応する複数の教示データを抽出し、抽出された前記複数の教示データのそれぞれが示す情報を、前記生体信号が表す情報として決定する、項目3に記載のシステム。
前記生体信号が表す情報は、複合動作が行われたことを示す、項目4に記載のシステム。
前記演算値は、合計値である、項目2〜5のいずれか一項に記載のシステム。
前記記憶手段は、情報を一時的に記憶するバッファであり、前記類似度は前記バッファに一時的に記憶される、項目1〜6のいずれか一項に記載のシステム。
前記所定期間は、約80〜200msである、項目1〜7のいずれか一項に記載のシステム。
前記検出手段を対象の身体に装着するための装着手段をさらに備える、項目1〜8のいずれか一項に記載のシステム。
前記身体が、前記対象の上肢、腹部、首部、下肢、または背中である、項目9に記載のシステム。
手指リハビリ用、嚥下診断用、車椅子用、義手用、義腕用、義足用、ロボット用、上肢補助装置用、下肢補助装置用、または、体幹補助装置用の、項目1〜10のいずれか一項に記載のシステム。
項目1〜11のいずれか一項に記載のシステムと、
手指運動アシスト装置と
を備える手指リハビリ装置。
項目1〜11のいずれか1項に記載のシステムを備える嚥下診断装置。
本明細書において、「生体信号」とは、生体が発する信号のことをいう。生体信号は、例えば、生体の筋肉の活動を示す筋電信号、生体の心臓の活動を示す心電信号、生体の脳の活動を示す脳波、神経細胞において伝達される神経信号等を含むがこれらに限定されない。本明細書で扱う生体信号は、計測された広義の生体信号から抽出されたスカラー量を指す。スカラー量の生体信号を扱うことにより、座標依存性がなくなり、極めて高い汎用性と利便性を実現することができる。本明細書では生体信号の特定の値は、特定の情報(例えば、生体の特定の動作(例えば、手を握る動作、手を開く動作、笑う動作等)、生体の特定の状態(例えば、筋疲労の程度、種類等))と関連付けられ得る。
図1は、本発明の生体信号が表す情報を識別するためのシステム10の構成の一例を示す。システム10は、生体信号検出手段100とコンピュータ装置200とを備える。生体信号検出手段100は、生体信号を検出して、検出された生体信号を出力するように構成されている任意の手段であり得る。例えば、生体信号検出手段100は、生体の筋電信号を検出可能な筋電センサを備える筋電デバイス、生体の心電信号を検出可能な心電センサを備える心電計、生体の脳波を検出可能な脳波センサを備える脳波計等であり得る。生体信号検出手段100は、検出された生体信号が座標依存性を有する生体信号である場合(例えば、検出された脳波が(計測部位の座標,強度)のベクトル量である場合、または、フィルム上の電極で検出された筋電信号が(計測部位の座標,強度)のベクトル量である場合等)に、検出された生体信号からスカラー量を抽出して出力するように構成され得る。コンピュータ装置200には、データベース部250が接続されている。生体信号検出手段100とコンピュータ装置200とは、任意の態様で接続される。例えば、生体信号検出手段100とコンピュータ装置200とは、有線で接続されてもよいし、無線で接続されてもよい。例えば、生体信号検出手段100とコンピュータ装置200とは、ネットワーク(例えば、インターネット、LAN等)を介して接続されてもよい。コンピュータ装置200は、例えば、生体信号検出手段100と共に使用されるコンピュータ装置であってもよいし、例えば、生体信号検出手段100とは離れた位置にある遠隔サーバ装置であってもよい。
上述した例では、生体信号検出手段100が、検出された生体信号が座標依存性を有する生体信号である場合に、検出された生体信号からスカラー量を抽出して出力することを説明したが、コンピュータ装置200が、生体信号検出手段100から受信された生体信号からスカラー量を抽出するようにすることも本発明の範囲内である。
図5は、本発明の生体信号が表す情報を識別するため処理の一例を示す。この処理は、システム10において実行される。
本発明のシステム10は、生体信号を検出し、それによって何等かの出力を行うことが有用である任意の用途に使用され得るが、好ましくは手指リハビリ用、嚥下診断用、車椅子用、義手用、義腕用、義足用、またはロボット用、上肢補助装置用、下肢補助装置用、体幹補助装置用であり得るがこれらに限定されない。例えば、ロボット用である場合、例えば、ロボット全体に適用されてもよいし、ロボットアーム、ロボットハンド等のロボットの一部に適用されてもよい。
被験体(20代健常男性)の上肢に筋電センサを装着し、被験体にしっかりと力を入れて動作をさせ、筋電信号の識別と動作との対応関係を試験した。筋電センサは、アンプ部と、500Hzのローパスフィルタ、10Hzのハイパスフィルタ、50Hzのノッチフィルタを備えるものであり、所定時間として80msで実験を行った。
被験体(20代健常男性)の上肢に筋電センサを装着し、被験体に最小限の力で動作をさせること以外は実施例1と同様に、筋電信号の識別と動作との対応関係を試験した。
100 生体信号検出手段
200 コンピュータ装置
250 データベース部
Claims (14)
- 生体信号が表す情報を識別するためのシステムであって、前記システムは、
生体信号を検出する検出手段と、
前記検出された生体信号を解析して特徴データを出力する解析手段と、
前記特徴データと、複数の教示データのうちの各々との類似度を示す出力ベクトルを決定する第1の決定手段と、
前記出力ベクトルを時刻ごとに時系列に記憶する記憶手段と、
前記記憶手段に記憶された時系列の出力ベクトルにおける所定期間内の複数の出力ベクトルに基づいて、前記生体信号が表す情報を決定する第2の決定手段と
を備える、システム。 - 前記第2の決定手段は、
前記所定期間内の複数の出力ベクトルに基づいて前記複数の教示データごとに演算値を算出することと、
前記演算値に基づいて、前記生体信号が表す情報を決定することと
を行う、請求項1に記載のシステム。 - 前記第2の決定手段は、前記演算値のうち最も高い演算値に対応する教示データを抽出し、抽出された前記教示データが示す情報を、前記生体信号が表す情報として決定する、請求項2に記載のシステム。
- 前記第2の決定手段は、前記演算値のうち所定の閾値を超える演算値に対応する少なくとも1つの教示データを抽出し、抽出された前記教示データが示す情報を、前記生体信号が表す情報として決定する、請求項2に記載のシステム。
- 前記第2の決定手段は、前記演算値のうち所定の閾値を超える演算値に対応する複数の教示データを抽出し、抽出された前記複数の教示データのそれぞれが示す情報を、前記生体信号が表す情報として決定する、請求項4に記載のシステム。
- 前記生体信号が表す情報は、複合動作が行われたことを示す、請求項5に記載のシステム。
- 前記演算値は、合計値である、請求項2〜6のいずれか一項に記載のシステム。
- 前記記憶手段は、情報を一時的に記憶するバッファであり、前記出力ベクトルは前記バッファに一時的に記憶される、請求項1〜7のいずれか一項に記載のシステム。
- 前記所定期間は、約10〜200msである、請求項1〜8のいずれか一項に記載のシステム。
- 前記検出手段を対象の身体に装着するための装着手段をさらに備える、請求項1〜9のいずれか一項に記載のシステム。
- 前記身体が、前記対象の上肢、腹部、首部、下肢、または背中である、請求項10に記載のシステム。
- 手指リハビリ用、嚥下診断用、車椅子用、義手用、義腕用、義足用、ロボット用、上肢補助装置用、下肢補助装置用、または体幹補助装置用の、請求項1〜11のいずれか一項に記載のシステム。
- 請求項1〜12のいずれか一項に記載のシステムと、
手指運動アシスト装置と
を備える手指リハビリ装置。 - 請求項1〜12のいずれか1項に記載のシステムを備える嚥下診断装置。
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