JP6239623B2 - インスリン注入デバイスを制御するシステム及び方法 - Google Patents
インスリン注入デバイスを制御するシステム及び方法 Download PDFInfo
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- JP6239623B2 JP6239623B2 JP2015529818A JP2015529818A JP6239623B2 JP 6239623 B2 JP6239623 B2 JP 6239623B2 JP 2015529818 A JP2015529818 A JP 2015529818A JP 2015529818 A JP2015529818 A JP 2015529818A JP 6239623 B2 JP6239623 B2 JP 6239623B2
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Description
本出願は、2012年8月30日に出願した米国仮特許出願第61/694,950号、2012年8月30日に出願した米国仮特許出願第61/694,961号、2013年4月17日に出願した米国仮特許出願第61/812,874号、2013年4月25日に出願した米国特許出願第13/870,902号、2013年4月25日に出願した米国特許出願第13/870,907号、および2013年4月25日に出願した米国特許出願第13/870,910号の利益を主張するものである。上記の出願の内容は、本願に引用して援用する。
UPは、インスリン送達システムに送信されるコマンドの比例成分であり、
UIは、インスリン送達システムに送信されるコマンドの積分成分であり、
UDは、インスリン送達システムに送信されるコマンドの微分成分であり、
KPは、比例ゲイン係数であり、
KIは、積分ゲイン係数であり、
KDは、微分ゲイン係数であり、
Gは、現在の血糖値であり、
GBは、所望の基礎グルコースレベルであり、
tは、最後のセンサー較正以降経過した時間であり、
t0は、最後のセンサー較正の時刻であり、
IBは、t0における基礎インスリン濃度であるか、またはUI(t0)として記述することもできる。
KP:(グルコースmg)/(血漿dl)当たり(インスリンmU)/分/(体重Kg)、
KI:(グルコースmg)/(血漿dl)分当たり(インスリンmU)/分/(体重Kg)、および
KD:(グルコースmg)/(血漿dl)/分当たり(インスリンmU)/分/(体重Kg)。
以下のように定義する。
Define:
IP(i)=(1−k2)(ISC(i))+k2IP(i−1) (式2b)
IEF(i)=(1−k3)(IP(i))+k3IEF(i−1) (式3b)
ID=PID・E−γ1ISC−γ2IP−γ3IEFF (式6)
方程式(式1c)、(式4)および(式5)を(式6)に代入し、並べ替えると、以下の伝達関数が得られる。ここで、GMはゲイン乗数である。
ySS(t→∞)=lims→0(sT(s)X(s))
ySS(t→∞)=lims→0(T(s))
に簡約される。
状態フィードバックが存在しない(γ1、γ2、およびγ3=0)場合、定常状態解は、方程式(式7)から得られて、
ID(t→∞)=1 (式11)
となる。
ゲイン補正因子の無い状態フィードバックを用いると、定常状態解は、
次いで、GMは、方程式(式12)と方程式(式11)との比として評価されて、GM=1+γ1+γ2+γ3が得られる。
D=s3+(α1+α2+α3+γ1α1)s2+
(α1α2+(α1+α2)α3+γ2α1α2+(α2+α3)γ1α1)s+
(α1α2α3+γ3α1α2α3+γ2α1α2α3+γ1α1α2α3) (式14)
s3+(α1+α2+α3+γ1α1)s2+
(α1α2+(α1+α2)α3+γ2α1α2+(α2+α3)γ1α1)s+
(α1α2α3+γ3α1α2α3+γ2α1α2α3+γ1α1α2α3)=0 (式16)
(式16)の所望のシステム極または根が、固有値λ1、λ2、およびλ3によって定義される場合、特性方程式は、以下のように書かれ得る。
(s−λ1)(s−λ2)(s−λ3)=0
展開し、sの似た冪を集めることによって(式16)は、以下のように書かれ得る。
s3−(λ1+λ2+λ3)s2+(λ1λ2+λ1λ3+λ2λ3)s−λ1λ2λ3=0 (式17)
α1+α2+α3+γ1α1=−(λ1+λ2+λ3) (式18)
α1α2+α1α3+α2α3+γ2α1α2+γ1α1(α2+α3)=
λ1λ2+λ1λ3+λ2λ3 (式19)
α1α2α3+γ3α1α2α3+γ2α1α2α3+γ1α1α2α3=λ1λ2λ3 (式20)
ID=PID・E−γ1ISC−γ2IP−γ3IEF
好ましい実施形態では、一定のゲイン成分KP、KI、KDを有するPID制御応答が説明された。好ましい制御応答は、ゼロ定常状態誤差(すなわち、定常状態グルコースから所望の基礎グルコースを引いた値(GB)=0)を保証するけれども、本来、積分成分
ここで
CPは血漿中のインスリン濃度であり、
I0は時刻ゼロで血漿に直接送達される投与インスリンの質量であり、
VPは身体内の血漿の体積であり、
P1はインスリンクリアランスの時定数の逆数であり、
tは投与インスリンが血漿内に直接送達されてから経過した時間である。
kは体積インスリンクリアランス速度であり、
VPは身体内の血漿の体積である。
CPは血漿中のインスリン濃度であり、
I0は時刻ゼロで皮下組織に送達される投与インスリンの質量であり、
Dは拡散係数(インスリンが間質液ISFから血糖内に拡散する速度)であり、
VPは身体内の血漿の体積であり、
VISFはインスリンが送達される先の間質液ISFの容積であり、
P2は時定数であり、
P3はP2以上の時定数であり、
tは投与インスリンが間質液ISF内に送達されてから経過した時間である。
UCOMP n=(1−γ)UCOMP n−1+UPID n+(1−α)UPID n−1、ただし、式中、
UPID nは現在のコマンドであり、
UPID n−1は以前のコマンドであり、
UCOMP n−1は以前の補償済み制御出力であり、
αは進み時定数の逆数(1/分)であり、
γは遅れ時定数の逆数(1/分)である。
IP(s)を前の式に代入し、kを大きくすると、
比例成分応答:
微分成分応答:
(SG≦60mg/dl AND Icon n−1>KP(SP−60))
の場合、
Icon n−1=KP(SP−60)
この方程式は、センサーグルコースが60mg/dl未満に降下する場合に、すべての安定した、または降下するセンサーグルコース信号について、インスリン送達がゼロになるように積分器をリセットする。このクリッピング限界は、人の逆調節反応に類似の絶対閾値を表す。
Rs2=(V0−Vcnt/Isig)
t=閉ループモードに入ろうと試みるときの時刻、
最近の較正係数(CFR)=一番最近のセンサー較正係数(CF)値、
tR=CFRが取得された時刻、
以前の較正係数(CFP)=CFRの前の最後のCF値、
tP=CFPが取得された時刻、
CFchange=CFの対に対する、以前のCFから現在のCFへの変化のパーセンテージ、CFchangeは、次の式に従って計算され得る。
CFchange=(abs(CFcurrent−CFprevious)/CFprevious)*100 (式50)
tRecent=閉ループモードを開始することを試みる前の一番最近の較正係数に対する時間窓(分)
tDiffmin=最近の較正と最近の構成の前の較正との間の最小時間差(分)
tDiffmax=最近の較正と以前の較正との間の最大時間差(分)
CFmin=最小許容可能CF(mg/dL/nA)
CFmax=最大許容可能CF(mg/dL/nA)
CFprevious=CF値の対におけるCFcurrentの前のCF値
CFchangeTh=%の許容可能なCFchangeに対する閾値(mg/dL/nA)
If(tPが時間窓(tR−tDiffmin:tR)内にない)、以下の論理がチェックされる。
If(CFmin≦CFR≦CFmax)、
If(t−tRecent≦tR≦t)
If(tR−tDiffmax≦tP≦tR−tDiffmin)
If(CFmax≦CFP≦CFmax)
上で述べた式50において、CFRをCFcurrentとして、CFPをCFpreviousとして、CFchangeを計算する
If(CFchange≦CFchangeTh)
閉ループに入る
Else その時点で閉ループに入れない
Else その時点で閉ループに入れない
Else その時点で閉ループに入れない
Else その時点で閉ループに入れない
Else 閉ループに入れない
If(tPが時間窓(tR−tDiffmin:tR)内にある)、
CFV=tR−tDiffmax:tR−tDiffminの時間窓内の一番最近のCF値
tV=CFVが取得された時刻
If(CFmin≦CFR≦CFmax)
If(利用可能なCFVがある)
上で述べた式50において、CFRをCFcurrentとして、CFVをCFpreviousとして、CFchangeを計算する
If(CFV、CFR、およびtVとtRとの間のすべてのCF値が(CFmin:CFmax)の範囲内に収まる)AND(CFVとCFRとの間のCFchangeが≦CFchangeThである)
閉ループに入る
Else その時点で閉ループに入れない
Else その時点で閉ループに入れない
Else その時点で閉ループに入れない
Else 閉ループに入れない
tRecent=120分
tDiffmin=120分
tDiffmax=480分
CFmin=2.5mg/dL/nA
CFmax=6mg/dL/nA
CFR=meterBG/(Isig−2) (式A1)
ここで、CFRは、最近の較正係数値であり、meterBGは、測定器BG値であり、Isigは、センサーIsig値である。式A1中の「−2」は、較正係数およびセンサーグルコースを計算するときに較正アルゴリズムによって使用される定数オフセットを表す。
CFmin≦CFR≦CFmax (式A2)
CFmin≦CFP≦CFmax (式A3)
ここで、CFRは、最近の較正係数値であり、CFPは、以前の較正値であり、CFminは、2.5mg/dL/nAとして設定されている較正係数に対する最小値であり、CFmaxは、6mg/dL/nAとして設定されている較正係数に対する最大値である。
t−tRecent≦tR≦t (式A4)
ここで、tRは、最近の較正の時刻であり、tは、閉ループモードに入ろうと試みるときの時刻であり、tRecentは、閉ループモードを開始することを試みる前の一番最近の較正に対する時間窓である(120分に設定される)。
tR−tDiffmax≦tP≦tR−tDiffmin (式A5)
ここで、tPは、以前の較正の時刻であり、tRは、CFRが取得された時刻であり、tDiffmaxは、最近の較正と以前の較正との間の最大時間差(480分(8時間)として設定されている)であり、tDiffminは、最近の較正と最近の較正の前の較正との間の最小時間差(120分(2時間)として設定されている)である。
CFchange=(abs(CFR−CFP)/CFP)×100 (式A6)
CFchange≦CFchangeTh (式A7)
ここで、CFchangeは、較正係数の任意の対について以前の較正係数から現在の較正係数への較正係数の変化のパーセンテージであり、CFchangeThは、許容可能なCFchangeに対する閾値であり(これは、この例では35%に設定されている)、CFRは、一番最近の較正係数値であり、CFPは、CFRの前の最後の較正係数である。
tR−tDiffmax≦tP2≦tR−tDiffmin (式A8)
ここで、tP2は、第2の以前の較正係数(CFP2)が取得される時刻であり、tRは、CFRが取得された時刻であり、tDiffmaxは、tP2とtRとの間の最大時間差(この例では480分(8時間)として設定されている)であり、tDiffminは、tP2とtRとの間の最小時間差(この例では120分(2時間)として設定されている)である。
tP2≦t1...tn≦tR (式A9)
ここで、t1...tnは、さらに多くの較正係数(CF1...CFn)が観測されるときの時刻であり、tRは、CFRが取得された時刻であり、tP2は、CFP2が取得された時刻である。
t−tRecent≦tR≦t (式A10)
ここで、tRは、最近の較正の時刻であり、tは、閉ループモードに入ろうと試みるときの時刻であり、tRecentは、閉ループモードを開始することを試みる前の一番最近の較正に対する時間窓である(この例では120分に設定される)。
CFmin≦CFR≦CFmax (式A11)
CFmin≦CFP≦CFmax (式A12)
CFmin≦CFP2≦CFmax (式A13)
CFmin≦CF1...CFn≦CFmax (式A14)
ここで、CFRは、最近の較正係数であり、CFPは、以前の較正係数であり、CFP2は、第2の以前の較正係数であり、CF1...CFnは、tP2とtRとの間で取得される較正係数であり、CFminは、較正係数に対する最小値(この例では2.5mg/dL/nAとして設定される)であり、CFmaxは、較正係数に対する最大値(この例では、6mg/dL/nAとして設定される)である。
CFchange=(abs(CFR−CFP2)/CFP2)×100 (式A15)
CFchange≦CFchangeTh (式A16)
ここで、CFchangeは、較正係数の任意の対について以前の較正係数から現在の較正係数への較正係数の変化のパーセンテージであり、CFchangeThは、許容可能なCFchangeに対する閾値であり(これは、この例では35%に設定されている)、CFRは、一番最近の較正係数値であり、CFP2は、式A8に記述されている時間範囲内の一番最近の較正係数値である。
ISF=ISFfactor×ISF0 (式A18)
ここで、ISFは、患者の調整済みインスリン感受性係数(mg/dL/ユニット)であり、ISF0は、患者の確定したインスリン感受性係数(mg/dL/ユニット)であり、ISFfactorは、ISF調整係数(無名数)である。ISFfactorに対するデフォルト値は、1に設定され、これによりISF=ISF0となる。しかし、この特定の例に関しては、ISFfactorは、患者のインスリン感受性係数を最適化する柔軟性を高めるために0.5から2の範囲を有する調整可能なパラメータとして割り当てられている。
DynSP(n)=cd1・DynSP(n−1)+cd2・DynSP(n−2)+cn0・DeltaGlu(n)+cn1・DeltaGlu(n−1) (式53)
ここで、DynSPは、動的な設定点値であり、nは、現在のサンプリング点であり、n−1は、最後のサンプリング点であり、n−2は、最後から2番目のサンプリング点である。パラメータcd1、cd2、cn0、およびcn1は、設定点モデルの係数である。これらのパラメータは、以下で示されているように、設定点モデルの2つの時定数(τsp1およびτsp2)に基づき計算される。
axx1=1/τsp1
axx2=1/τsp2
eaxx1=e−axx1・Ts
eaxx2=e−axx2・Ts
daxx21=axx2−axx1
上記の式において、Tsはサンプリング間隔(分)を示し、τsp1およびτsp2は、設定点モデルの時定数である。さらに、axx1は、時定数τsp1の逆数であり、axx2は、時定数τsp2の逆数であり、eaxx1は、τsp1に対する指数関数的減衰係数であり、eaxx2は、τsp2に対する指数関数的減衰係数であり、daxx21は、τsp1およびτsp2の逆数の間の差である。
FinalTarget=Setpoint+DynSP(n) (式54)
Setpoint=120mg/dL
MinDeltaGlu=30mg/dL(公称)、0mg/dL(下限)、600mg/dL(上限)
τsp1=25分(公称)、0.1分(下限)、250分(上限)
τsp2=30分(公称)、0.1分(下限)、250分(上限)
u(n)=P(n)+I(n)+D(n)−γ1ISC−γ2IP−γ3IEFF (式55)
PIDRate(n)≡u(n)であることに留意されたい。式55において、インスリン注入速度u(n)は、図49に示されている最終インスリン投与量962を表す。式55、P(n)、I(n)、およびD(n)は、それぞれ、PIDコントローラの比例、積分、および微分成分である。インスリンフィードバック成分は、残りの項に対応する。変数γ1、γ2、およびγ3は、調節係数を表す。いくつかの実施形態によれば、γ1=0.64935、γ2=0.34128、およびγ3=0.0093667であるが、他の値も使用することができる。パラメータISC(n)、IP(n)、およびIEFF(n)は、それぞれ、皮下、血漿、および有効部位コンパートメントに対応するインスリン薬物動態モデルの状態に対応する。したがって、送達されるインスリンの量は、異なるコンパートメント内の予測されるインスリン濃度に比例して低減される。
P(n)=Kp[SG(n)−FinalTarget(n)] (式56)
ここで、Kpは、コントローラの総ゲイン((ユニット/時)/(mg/dL))であり、SG(n)は、現在のセンサーグルコースであり、nは、現在のサンプリング点を示し、FinalTarget(n)は、式54から計算された最終目標グルコース設定点である。Kpは、患者特有の値であり、したがってKpの実際の値は、人によって異なることは理解されるであろう。範囲は、患者に応じて変化し得るけれども、ほとんどの典型的なシナリオでは、Kpの値は0.008から0.200の範囲内にあるものとしてよい。
D(n)=Kp×TD×dSGdt(n) (式58)
ここで、Kpは、コントローラの総ゲインであり、TDは、微分時定数であり、dSGdt(n)は、センサーグルコース値の微分(プレフィルターで雑音を除去)であり、nは、現在のサンプリング点を示す。
KP=KPfactor・KP0・(1+γ1+γ2+γ3) (式60)
ここで、KPは、コントローラの総ゲインであり、KPfactorは、KPに対するゲイン係数であり、KP0は、デフォルトのコントローラのゲインであり、γ1(0.64935)は、皮下インスリン濃度に対する調節係数であり、γ2(0.34128)は、血漿インスリン濃度に対する調節係数であり、γ3(0.0093667)は、有効インスリン濃度に対する調節係数である。
ここでImaxfactorは、Imaxに対するゲイン係数であり、Basalは、被験者の夜間基礎速度である。これらの式により、IClipは、センサーグルコース値が閾値上限(UnwindHigh)より高いときにImax(定数値である)に等しくなる。いくつかの実施形態において、Imaxの値(ユニット/時単位で表される)は、約15に達し得る。典型的な場合において、Imaxは、5.0のデフォルト値を有することができる。センサーグルコース値が、閾値上限と閾値下限(UnwindLow)との間にある場合、IClipはIramp(n)に等しくなり、これは式62に示されているように計算される。
Ilow(n)=Kp[Setpoint(n)−Unwindlow] (式63)
ここで、Kpは、コントローラの総ゲインであり、Setpointは、使用者によって定義された目標グルコースであり、UnwindLowは、センサーグルコース閾値下限である。
ISC(n)=α11×ISC(n−1)+β1×ID(n) (式65)
ただし、
IP(n)=α21×ISC(n−1)+α22×IP(n−1)+β2×ID(n) (式65c)
ただし、
IEFF(n)=α31×ISC(n−1)+α32×IP(n−1)+α33×IEFF(n−1)+β3×ID(n) (式66)
式66について、
BGLBL=Setpoint−ILB (式68a)
ここで、BGLBL(mg/dL)は、Umaxに達したときのバッファ下限BGであり、Setpointは、使用者によって定義されている目標グルコース設定点値944(図49)であり、ILBは、システムがより高いインスリン必要量を扱えるように追加のバッファとして許容する量(mg/dL単位)である、インスリン限度バッファである。例えば、ILBが50であれば、システムは、追加のインスリンを送達してSetpointから50mg/dLだけ下げることができる。
γ1=0.64935
γ2=0.34128
γ3=0.0093667
α11=0.90483741803596
α21=0.065563404170158
α22=0.931062779704023
α31=0.00297495042963571
α32=0.083822962634882
α33=0.083822962634882
β1=5.70975491784243
β2=0.202428967549153
β3=0.202428967549153
IOB(n)=ci1・IOB(n−1)+ci2・IOB(n−2)+ci3・IOB(n−3)+cb0・Ubolus(n)+cb1・Ubolus(n−1)+cb2・Ubolus(n−2) (式71)
ci1=eaxx3+eaxx4+eaxx5 (式71a)
ci2=−(eaxx3×eaxx4+(eaxx3+eaxx4)×eaxx5) (式71b)
ci3=eaxx3×eaxx4×eaxx5 (式71c)
cb0=1
cb1=dprod×(−(daxx22×eaxx3+daxx22×eaxx4)×axx3×axx4+(daxx31×eaxx3+daxx31×eaxx5)×axx3×axx5−(daxx32×eaxx4+daxx32×eaxx5)×axx4×axx5) (式71d)
cb2=dprod×(daxx22×eaxx3×eaxx4×axx3×axx4+daxx32×eaxx4×eaxx5×axx4×axx5−daxx31×eaxx3×eaxx5×axx3×axx5) (式71e)
ただし、
axx3=1/τSC (式71f)
axx4=1/τp (式71g)
axx5=1/τeff (式71h)
eaxx3=e−axx3・TsC (式71i)
eaxx4=e−axx4・TsC (式71j)
eaxx5=e−axx5・TsC (式71k)
daxx22=axx4−axx3 (式71l)
daxx31=axx5−axx3 (式71m)
daxx32=axx5−axx4 (式71n)
dprod=−1/(daxx22×daxx31×daxx32) (式71o)
上記の式では、TsCは、TsC=Ts*6/CurveSpeedとして計算され得る、分単位の修正されたサンプリング間隔を示し、ただし、Tsは、サンプリング間隔であり、CurveSpeedは、インスリンオンボード減衰速度(時)である。τSC、τp、およびτeffは、インスリンPKモデルの皮下、血漿、および有効コンパートメントの各時定数である。
プロセス1100は、現在のIOB値IOB(n)に少なくとも一部は基づきIOB速度IOBRate(n)を計算することに留意されたい。1時間当たりのユニット数(U/h)で表されるIOB速度は、時間単位で手動ボーラスから体内に蓄積されたアクティブインスリンの量を表す。したがって、体内にすでに存在しているこの追加のインスリンは、コントローラ送達速度(PIDRate)から差し引かれる。これは、使用者によって投与されているすべての手動ボーラスを考慮し、コントローラによる過剰送達の可能性を最小限度に抑える。ここで、GainIOBは、IOB減衰速度(h-1)であり、MinIOBは、PIDRateを補償するために必要な最小IOBである(ただし、MinIOBはユニットで表される)。したがって、IOB速度は、現在のIOB値が最小IOB値より大きいときにIOB減衰速度を掛けた現在のIOB値に等しいものとして計算され、また現在のIOB値が最小IOB値以下であるときにゼロに等しいとして計算される。この点で、MinIOBは、IOBに対する最小閾値であり、これより低いときにグルコースに対するIOBの効果は無視できると考えられ、したがって、補償される必要はない。
G0=CGMk−LTH±0.14・CGMk−LTH (式77)
dG0=±grad_bound
式77について、CGMk−LTHは、サンプリング時間k−LTHにおけるCGM測定であり、grad_boundは、時間を単位とする定義済み絶対最大BG微分(mg/dL/分)である。
α=120+τ1+τ2
β=3500+120τ1+120τ2+τ1τ2
χ=3500τ1+3500τ2+120τ1τ2
δ=3500τ1τ2
さらに、式78において、
G0=SGk−LTH±0.14・SGk−LTH (式86)
dG0=±grad_bound (式87)
ここで、G0は、k−LTHのサンプリング時間に対する推定されるSG値(mg/dL)であり、SGk−LTHは、k−LTHのサンプリング時間に対するSG測定であり、dG0は、k−LTHのサンプリング時間に対する推定されるSG値の微分(mg/dL/分)であり、grad_boundは、時間を単位とする定義済み絶対最大SG微分(mg/dL/分)である。いくつかの実施形態では、grad_boundは、固定されたパラメータである。本明細書で提示されている例については、grad_boundは、値5mg/dL/分を有する。
(a)センサーIsigは、コントローラによって保存され、
(b)SG値は、コントローラによって保存され、
(c)ゼロ次ホールド(ZOH)カウントは、ゼロに設定され、
(d)システムは、すでに説明されているように閉ループモードにとどまる。
(a)ZOHカウントは、ゼロに設定され、
(b)Isigは、SG値およびセンサー較正係数を使用して式91(以下を参照)によって計算され、
(c)システムは閉ループモードにとどまる。
Isigcalc=(SG/CF’)+2 (式91)
(a)ZOHカウントは、ゼロに設定され、
(b)SGは、Isig値およびセンサー較正係数を使用して式92(以下を参照)によって計算され、
(c)システムは閉ループモードにとどまる。
SGcalc=(Isig−2)×CF’ (式92)
ZOH Count≦ZOH Count Max
である場合、
(a)センサーIsigおよびSGに対するZOHカウントは、前の値に基づき計算され、
(b)ZOH Count=ZOH Count+1、
(c)TimeoutCount=0、
(d)システムは閉ループモードにとどまる。
ZOH Count>ZOH Count Max
である場合、
(a)センサーIsigおよびSG値に対する「無効」プレースホルダーは、保存され、
(b)システムは閉ループモードにとどまるが、開ループモードに入っているときの患者の夜間基礎速度の半分である、一時的安全基礎速度に切り替わり、
(c)安全基礎速度で送達している間にパケットがシステムによって受信される場合、システムは、閉ループモードに遷移して戻り、
(d)システムが安全基礎速度で送達している1分おきに、TimeoutCountは、増分され、すなわち、TimeoutCount=TimeoutCount+1となり、
(e)TimeoutCount>Timeout Count Maxである場合、システムは、開ループモードに切り替わる。
Claims (6)
- 使用者に対してインスリンを注入するインスリン注入デバイスを制御するシステムであって、
前記使用者に送達されたインスリンの手動ボーラスの過去の値を受信する手段と、
少なくとも1つのプロセッサデバイスを備えるプロセッサアーキテクチャと、
前記プロセッサアーキテクチャに関連し、プロセッサ実行可能命令を記憶するメモリと、を備え、
前記プロセッサ実行可能命令を、前記プロセッサアーキテクチャが実行することで、
a)過去の値から、前記手動ボーラスによって求められる前記使用者の身体内のアクティブインスリンの推定値を表す現在のインスリンオンボード(IOB)値を計算し、現在のIOB値は、前記使用者に対する履歴ボーラス送達データに少なくとも部分的に基づき、
b)計算された現在のIOB値に少なくとも部分的に基づいてIOB速度を計算し、IOB速度は、時間単位で前記手動ボーラスから前記使用者の体内に蓄積されたアクティブインスリンの量であり、
c)比例積分微分インスリンフィードバック(PID−IFB)制御アルゴリズムに従って非補償インスリン注入速度を計算し、
d)計算されたIOB速度と非補償インスリン注入速度とに少なくとも部分的に基づき調整済みインスリン注入速度を決定し、
e)決定された調整済みインスリン注入速度、または、非補償インスリン注入速度、または、現在の基礎速度が前記インスリン注入デバイスに対する最終インスリン注入速度として選択され、
最終インスリン注入速度を選択することは、
式
上記式において、
FinalRate(n)は選択された最終インスリン注入速度であり、
Basalは現在の基礎速度であり、
AdjustedRate(n)は決定された調整済みインスリン注入速度であり、
PIDRate(n)は取得された非補償インスリン注入速度であり、
f)選択された最終インスリン注入速度に従って前記使用者の体内にインスリンを送達し、
g)前記a)から前記f)を繰り返し実行する閉ループモードで前記インスリン注入デバイスを動作させるシステム。 - 請求項1に記載のシステムであって、
実行時に、前記プロセッサアーキテクチャにIOB速度を計算させる命令は、
計算されたIOB値が最小IOB値より大きい場合、前記プロセッサアーキテクチャに、IOB速度を、IOB減衰速度を乗算した計算されたIOB値と等しく設定させ、
計算されたIOB値が最小IOB値以下である場合、前記プロセッサアーキテクチャに、IOB速度をゼロに設定させる、ことを特徴とするシステム。 - 少なくとも1つのプロセッサデバイスを備えるプロセッサアーキテクチャと、前記プロセッサアーキテクチャに関連し、プロセッサ実行可能命令を記憶するメモリと、を含むコントローラによって実行されるインスリン注入デバイスのインスリン注入速度を制御する方法であって、
p)過去の手動インスリンボーラスから求められる使用者の身体内のアクティブインスリンの推定値を表す現在のインスリンオンボード(IOB)値を計算し、
q)計算された現在のIOB値に少なくとも部分的に基づきIOB速度を計算し、IOB速度は、時間単位で前記手動インスリンボーラスから前記使用者の体内に蓄積されたアクティブインスリンの量であり、
r)比例積分微分インスリンフィードバック(PID−IFB)制御アルゴリズムに従って非補償インスリン注入速度を計算し、
s)計算されたIOB速度および非補償インスリン注入速度に少なくとも部分的に基づき調整済みインスリン注入速度を決定し、
t)決定された調整済みインスリン注入速度、または、非補償インスリン注入速度、または、現在の基礎速度が前記インスリン注入デバイスに対する最終インスリン注入速度として選択され、
最終インスリン注入速度を選択することは、
式
上記式において、
FinalRate(n)は選択された最終インスリン注入速度であり、
Basalは現在の基礎速度であり、
AdjustedRate(n)は決定された調整済みインスリン注入速度であり、
PIDRate(n)は取得された非補償インスリン注入速度であり、
u)前記p)から前記t)を繰り返し実行する閉ループモードで前記インスリン注入デバイスのインスリン注入速度を制御する方法。 - 請求項3に記載の方法であって、
操作により、3コンパートメントインスリン薬物動態モデルに従って現在のIOB値を計算することを特徴とする方法。 - 請求項3または4に記載の方法であって、
IOB速度を計算することは、
計算されたIOB値が最小IOB値より大きい場合、IOB速度を、IOB減衰速度を乗算した計算されたIOB値と等しくなるように計算し、
計算されたIOB値が最小IOB値以下である場合、IOB速度をゼロに等しくなるように計算する、ことを特徴とする方法。 - 請求項3に記載の方法であって、
調整済みインスリン注入速度を決定することは、式 AdjustedRate(n)=max(0;PIDRate(n)−IOBRate(n))
に従って行われ、
IOBRate(n)は計算されたIOB速度である方法。
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EP2891087B1 (en) | 2022-06-08 |
US20140066885A1 (en) | 2014-03-06 |
CN104756116B (zh) | 2018-07-13 |
US20200353168A1 (en) | 2020-11-12 |
US9364609B2 (en) | 2016-06-14 |
AU2015200826B2 (en) | 2016-06-09 |
KR20150043535A (ko) | 2015-04-22 |
KR102028790B1 (ko) | 2019-10-04 |
AU2013309425B2 (en) | 2018-10-18 |
CA2882027A1 (en) | 2014-03-06 |
US9526834B2 (en) | 2016-12-27 |
AU2015200826A1 (en) | 2015-03-12 |
US20140066892A1 (en) | 2014-03-06 |
CN105999479A (zh) | 2016-10-12 |
EP2905711A1 (en) | 2015-08-12 |
KR20150050562A (ko) | 2015-05-08 |
CN104756116A (zh) | 2015-07-01 |
CA2882027C (en) | 2020-09-01 |
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