JPWO2020067505A1 - 呼吸数計測装置 - Google Patents
呼吸数計測装置 Download PDFInfo
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- 230000036387 respiratory rate Effects 0.000 title claims abstract description 104
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 109
- 239000001301 oxygen Substances 0.000 claims abstract description 109
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 109
- 230000029058 respiratory gaseous exchange Effects 0.000 claims abstract description 61
- 238000004364 calculation method Methods 0.000 claims abstract description 32
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Abstract
Description
実施形態の一側面に係る呼吸数計測装置と共に使用される、圧力変動吸着方式の酸素濃縮装置の一例である、PSA式酸素濃縮装置の構成を説明する。
本発明に係る呼吸数計測装置の概略構成の一例を説明する。
図3は、マイコン部7の構成ブロックの一例を示す図である。
図2に示す構成を用いて鼻カニューラ3から患者呼吸モデルの呼吸圧を印加し、呼吸情報を取得したデータを用いて、本実施形態で行われる処理の原理について説明する。
ある一定の閾値以上をピークとして判断する方法であっても、閾値をXとして設定した場合は、a2のような低いピークが検出できなくなる可能性があり、Yに設定した場合は、ノイズ成分bをピークとして検出してしまう可能性がある。本例では3呼吸分程度しか波形を示していないが、実際の波形ではここで示した以上にピークやノイズ成分の高さがばらつく可能性があり、ピークを確実にとらえ、ノイズを確実に除去できる閾値の設定は極めて困難である。
1分当たりの呼吸数(bpm)=60秒÷(ピーク点のステップ数×サンプリング時間)
呼吸数8未満の場合 :σ2≧18(Pa2)
呼吸数8〜10の場合:σ2≧18(Pa2)
呼吸数11以上の場合:σ2≧7(Pa2)
であるが、使用する酸素供給装置によりに値が異なる可能性がある。呼吸数等のパラメーターによりばらつきがあるので、分散判定の閾値は使用する酸素供給装置により適切に設定する必要がある。
2 配管
3 鼻カニューラ
4 呼吸数計測装置
5 オリフィス
6 圧力センサ
7 マイコン部
71 記憶部
72 処理部
721 検知データ取得部
722 演算部
723 推定部
724 呼吸数出力部
8 表示部
Claims (7)
- 患者と接続され、且つ、加圧・減圧を周期的に繰り返すことで空気中の酸素を濃縮する圧力変動吸着方式の酸素濃縮装置から酸素濃縮ガスを患者に供給する配管内の管内圧力及び/又は管内気体流量を検知して、圧力データ及び/又は気体流量データを出力する検知部と、
前記圧力データ及び/又は前記気体流量データに基づいて、患者呼吸情報データを抽出する演算部と、
前記患者呼吸情報データに基づいて所定時間当たりの呼吸数を推定する推定部と、を有し、
前記推定部は、時間Δtを変化させながら、前記患者呼吸情報データと、前記患者呼吸情報データから前記時間Δtだけずらしたデータとの自己相関係数を求め、前記自己相関係数がピークとなる時間Δtを呼吸間隔として、前記呼吸数を推定する、
ことを特徴とする呼吸数計測装置。 - 前記推定部は、少なくとも10秒以上の前記患者呼吸情報データを示す波形を用いて、前記呼吸数を推定する、請求項1に記載の呼吸数計測装置。
- 前記推定部は、所定の閾値を超えた前記自己相関係数のピークを前記呼吸数の推定に利用する、請求項1又は2に記載の呼吸数計測装置。
- 前記閾値は、0.3以上且つ0.7以下の値である、請求項3に記載の呼吸数計測装置。
- 前記所定の閾値を超えた前記自己相関係数のピークを取得できない場合、計算不能であった旨を出力する、請求項1〜4の何れか一項に記載の呼吸数計測装置。
- 前記演算部は、前記圧力データ及び/又は前記気体流量データに基づいて、酸素濃縮装置の動作により発生する前記酸素濃縮ガスの周期的な圧力変化及び/又は流量変化を示す変動値データを推定し、前記変動値データを前記圧力データ及び/又は前記気体流量データから除去することによって、前記患者呼吸情報データを抽出する、請求項1〜5の何れか一項に記載の呼吸数計測装置。
- 予め測定した前記変動値データを記憶する記憶部を更に有し、
前記演算部は、前記変動値データを前記圧力データ及び/又は前記気体流量データから除去することによって、前記患者呼吸情報データを抽出する、請求項1〜5の何れか一項に記載の呼吸数計測装置。
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Application Number | Priority Date | Filing Date | Title |
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JP2018185785 | 2018-09-28 | ||
JP2018185785 | 2018-09-28 | ||
PCT/JP2019/038359 WO2020067505A1 (ja) | 2018-09-28 | 2019-09-27 | 呼吸数計測装置 |
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- 2019-09-27 EP EP19867937.5A patent/EP3858409B1/en active Active
- 2019-09-27 US US17/279,215 patent/US20220031986A1/en active Pending
- 2019-09-27 WO PCT/JP2019/038359 patent/WO2020067505A1/ja unknown
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KR20210047936A (ko) | 2021-04-30 |
CN112739403B (zh) | 2024-04-30 |
WO2020067505A1 (ja) | 2020-04-02 |
EP3858409B1 (en) | 2024-05-08 |
KR102526829B1 (ko) | 2023-04-27 |
EP3858409A1 (en) | 2021-08-04 |
JP7055217B2 (ja) | 2022-04-15 |
EP3858409A4 (en) | 2022-06-29 |
CN112739403A (zh) | 2021-04-30 |
US20220031986A1 (en) | 2022-02-03 |
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