JP2010537751A - 診断用センサユニット - Google Patents
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Abstract
【選択図】図1
Description
K*SvO2+(1−K)*SaO2 = StO2
上式において、Kは、検査中の組織における動脈の静脈に対する容積割合に依存する組織依存性の補正係数である。平均では、この値は、0.5より僅かに小さい。本発明によれば、それぞれの場合において、組織によって決まるこの値は、上記の式から静脈酸素飽和度を決定するために、生体電気インピーダンス測定により決定することができる。本発明によるセンサユニットを用いて、検査中の体組織の潅流V、即ち、潅流に関係する容積変化を測定できる。
VO2 = V*(SaO2−SvO2)
上式によって、測定位置における代謝活動の測定値である局所酸素消費量VO2を最終的に計算できる。
[Glu] = f1(ΔT,VO2)
上式において、[Glu]はグルコース濃度を表す。熱発生量ΔTは、本発明によるセンサユニットの熱センサによって測定できる。例えば、動脈の温度と、断熱が完全な場合に皮膚表面が到達するであろう温度との差から決定できる(ΔT=T∞−Tartery)。f1(ΔT,VO2)は、グルコース濃度の熱発生量と酸素消費量に対する関数依存性を示す。酸素消費量は、前記したように、静脈酸素飽和度と動脈酸素飽和度との差、及び潅流から決まる。しかし、栄養素の摂取中又は摂取直後のグルコース濃度を決定するためには、エネルギー代謝における脂肪代謝の割合を表す補正項を考慮しなければならない。次の式が当てはまる。
[Glu] = f1(ΔT,VO2)+X*f2(ΔT,VO2)
上式において、Xは、栄養分の摂取の後は負となる係数である。これに関連し、Xは摂取した栄養分の組成に依存する。特に、Xは脂肪と炭水化物が代謝に関与する割合に依存する。係数Xは上記のように脈波速度の時間的推移を使用して決定できる。炭水化物又はグルコースが直接消費された場合、Xは0である。値Xが増加すると、摂取した栄養分中の脂肪の割合が増加する。脈波速度の時間的推移、血圧及び/又は脈拍から補正係数Xを決定するためには、それぞれの場合において、装置のユーザーに適応させるための較正が通常必要となる。f2(ΔT,VO2)は、脂肪代謝についての、熱発生量と酸素消費量に対するグルコース濃度の関数依存性を示す。
[Glu]cell = a+b*ln(c*[Glu]blood)
定数a、b及びcは、検査中の患者の個々の生理機能に依存する。従って、センサユニットに接続された評価ユニットは、局所グルコース濃度から血中グルコースレベルを決定できるように更に設定でき、この場合、患者の生理機能依存するパラメータを考慮しなければならない。これらのパラメータは、対応する較正で決定できる。例えば、従来の方法で、侵襲的に決定した血中グルコース値と比較することによって決定できる。
Claims (15)
- 皮膚表面に近い体組織の少なくとも一種の生理学的パラメータを非侵襲的に検出するための診断用センサユニットであって、検査すべき体組織を照射する少なくとも1個の放射線源(4)と、体組織によって散乱及び/又は伝播された放射線を検出する少なくとも1個の放射線センサ(5)とを含む光学測定ユニット(100)を備え、少なくとも1個の放射線源(4)と少なくとも1個の放射線センサ(5)が共通のセンサハウジング(400)内に配置された診断用センサユニットであり、
2個以上のEKG電極(7)によってEKG信号を検出するEKGユニット(132)が設けられ、EKGユニット(132)の少なくとも1個のEKG電極(7)がセンサハウジング(400)のハウジング表面上に、光学測定ユニット(100)によって覆われた体組織の領域内の皮膚表面にEKG電極(7)が接触するように配置されていることを特徴とする診断用センサユニット。 - 温度又は熱センサ(6)がセンサハウジング(400)の中又は上に設けられていることを特徴とする、請求項1に記載の診断用センサユニット。
- 少なくとも1個のEKG電極(7)が導電材料の平面状の箔又はシートとして構成され、このEKG電極(7)が、少なくとも1個の放射線源(4)から放出されて検査すべき体組織に入る放射線を通過させるための少なくとも1個の開口部(410)を有していることを特徴とする、請求項1又は2に記載の診断用センサユニット。
- 温度及び熱センサ(6)のための少なくとも1個の他の開口部(440)が設けられていることを特徴とする、請求項2又は3に記載の診断用センサユニット。
- 生体電気インピーダンス測定ユニット(130)を有し、このインピーダンス測定ユニット(130)の少なくとも1個の給電又は測定電極がセンサハウジングのハウジング表面に設けられていることを特徴とする、請求項1〜4の何れかに記載の診断用センサユニット。
- EKG電極(7)の内の少なくとも1個が、同時に生体電気測定ユニット(130)の給電又は測定電極としても使用されることを特徴とする、請求項5に記載の診断用センサユニット。
- センサハウジング(400)は、1cm×1cm×1cm未満の寸法を有することを特徴とする、請求項1〜6の何れかに記載の診断用センサユニット。
- 光学測定ユニット(100)は、体組織で散乱及び/又は伝播された放射線を検出する少なくとも2個の放射線センサ(5)を有し、放射線センサ(5)が放射線源(4)からの距離が異なるように配置されていることを特徴とする、請求項1〜7の何れかに記載の診断用センサユニット。
- 検査中の体組織の異なる部分を照射する少なくとも2個の放射線源(4、4’)が設けられていることを特徴とする、請求項1〜8の何れかに記載の診断用センサユニット。
- 少なくとも2個の放射線源(4、4’)が異なる空間放出特性を有していることを特徴とする、請求項9何れかに記載の診断用センサユニット。
- 少なくとも1個の放射線源(4)が、放射線源(4)が放出した放射線をセンサハウジング(400)の表面まで導く導光要素(500)に接続されていることを特徴とする、請求項1〜10の何れかに記載の診断用センサユニット。
- 少なくとも2個の放射線源(4、4’)が、少なくとも2個の放射線源(4、4’)の放射線をセンサハウジング(400)の表面まで導く導光要素(500)に接続されていることを特徴とする、請求項11に記載の診断用センサユニット。
- 電気的差込み接続を備え、これによってセンサユニットを娯楽又は通信技術の装置(10)又はその他の携帯装置又はアクセサリーと接続できることを特徴とする、請求項1〜12の何れかに記載の診断用センサユニット。
- 装置(10)は、可搬式装置、特にノートブック、ラップトップ、パームトップ、又はハンドヘルドであることを特徴とする、請求項13に記載の診断用センサユニット。
- センサハウジング(400)の表面に対する体組織の接触圧を測定する手段が設けられていることを特徴とする、請求項1〜14の何れかに記載の診断用センサユニット。
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Also Published As
Publication number | Publication date |
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US20100222652A1 (en) | 2010-09-02 |
EP2203113A1 (de) | 2010-07-07 |
CN101827555B (zh) | 2012-11-21 |
JP5602629B2 (ja) | 2014-10-08 |
KR101562807B1 (ko) | 2015-11-02 |
CN101827555A (zh) | 2010-09-08 |
WO2009033624A1 (de) | 2009-03-19 |
EP2203113B1 (de) | 2015-02-25 |
KR20100068400A (ko) | 2010-06-23 |
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