tNIRS-1 非侵襲脳酸素モニタ
tNIRS-1は、定量性・再現性に優れた時間分解分光法による脳酸素モニタです。従来装置では困難であった、組織血液量の定量化、患者の間歇的な経過観察等を可能にします。
従来、TRS法は基礎研究の分野で使われていました。自社開発の高速センサと3波長半導体レーザを採用し、TRS法を応用した新しい臨床用脳酸素モニタを実現しました。
【医療機器認証番号】225AFBZX00091000
従来法(MBL法、SRS法)は、透過光の光強度を測定し、その情報から酸素飽和度などを算出しますが、測定部位の形状やプローブの装着状態の違いに影響されやすく、定量性の点で応 用に限界がありました。
TRS法は、生体に照射する光に短パルス光 を用い、透過光の時間応答波形を測定します。測定部位の形状やプローブの装着状態に影響されにくく、酸素飽和度などを精度良く安定的に測定できます。特に定量性・再現性に優れているため、日をまたいだデータの比較も可能になります。
$$R(t,\mu_a,\mu'_s) =\Biggl(\frac{4\pi c}{3\mu'_s}\Biggr)^{-\frac{3}{2}}\frac{1}{\mu'_s}t^{-\frac{5}{2}}exp(-\mu_act)exp\Biggl(-\frac{3}{4ct}\Biggl(\rho^2\mu'_s+\frac{1}{\mu'_s}\Biggr)\Biggr)$$
測定波形に合致するように理論波形をフィッテングし、最も波形が一致した時の吸収係数(µa)を取得します。3波長の吸収係数(µa)から生体の酸素飽和度(StO2)、総ヘモグロビン濃度(tHb)を算出します。
型名 | C12707 |
---|---|
測定項目 | 酸素化ヘモグロビン濃度 O2Hb( μM) 脱酸素化ヘモグロビン濃度 HHb (μM) 総ヘモグロビン濃度 tHb ( μM) 組織酸素飽和度 StO2( %) |
測定範囲 | StO2(%) 0 %~99 % |
測定サンプル間隔 | 5 s ~ 60 s (5 sステップ) |
測定方式 | TRS法(時間分解分光法) |
光源 | レーザダイオード(クラス1) |
照射光 | 波長755 nm、816 nm、850 nm(公称値) パルス発振、繰り返し周波数9 MHz |
光検出器 | MPPC(multi-pixel photon counter) |
チャンネル数 | 2チャンネル |
バッテリ動作時間 | 約30分間(フル充電時) |
データ保存回数 | 20回分 |
外部保存 | USBメモリ |
プローブファイバ長 | 約3.5 m |
生体情報モニタへの接続 | Philips社 IntelliBridge Interface Module接続により可能 |
電源 | AC 100 V、50 Hz/60 Hz |
消費電力 | 90 VA |
外形寸法/質量 | tNIRS-1本体 292 mm(W)×291 mm(H)×207 mm(D) 約7.5 kg |
医療機器認証番号 | 225AFBZX00091000 |
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