JP2022124488A - 超音波エネルギーを利用し熱ショックタンパク質の活性化を刺激するように適応させたシステム - Google Patents
超音波エネルギーを利用し熱ショックタンパク質の活性化を刺激するように適応させたシステム Download PDFInfo
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Abstract
Description
まず、SDMエネルギー送達モードにおけるHSP活性化およびタンパク質修復に対する大きな利点は、およそ10℃のスパイク温度の生成から生じる。この大きな温度上昇は、活性化されるHSPの数を定量的に記述するアレニウス積分およびタンパク質修復を促進するタンパク質への水拡散の速度に対して大きな影響を与える。これは、温度が、大きな増幅効果を有する指数関数(exponential)に入るからである。
I(r)=P/(4πr2) [1]
式中、Pは合計の超音波電力を示す。rでの持続時間tpの短パルスの終端での温度上昇は以下であり、
dT(tp)=Pαtp/(4πCvr2) [2]
式中、αは吸収係数であり、Cvは比熱容量である。tpでの熱拡散距離がrに匹敵するようになるところまでrが達するまで、または集束ビームの回折限界に達するまで、これは当てはまる。より短いrについては、温度上昇は、rとは本質的に無関係である。一例として、回折限界が、熱拡散によって判定された距離より短い半径方向距離で到達されたと仮定する。ここで、
rdif=(4Dtp)1/2 [3]
であり、式中、Dが熱拡散係数であり、r<rdifに関して、tpでの温度上昇は以下である:
r<rdifである場合、dT(rdif,tp)=3Pα/(8πCvD)[4]
したがって、パルスの終端で、温度上昇を記録することができる:
dtp(r)={Pαtp/(4πCv}[(6/rdif 2)U{rdif-r)+(1/r2)U(r-rdif)] [5]
熱拡散方程式に関するグリーン関数:
G(r,t)=(4ΩDt)-3/2 exp[-r2/(4Dt)][6]
をこの初期の温度分布に適用すると、時間tの焦点r=0での温度dT(t)が、以下であることが分かった:
dT(t)=[dTo/{(1/2)+(π1/2/6)}][(1/2)(tp/t)3/2+(π1/2/6)(tp/t)] [7]
とともに
dTo=3Pα/(8πCvD) [8]
Ω=AN[{tp(2kBTo 2/(3EdTo)}exp[-(E/kB)1/(To+dTo+dTN(NtI))]
+exp[-(E/kB)1/(To+dTN(NtI))]] [12]
式中、以下である:
合計の超音波電力: 5.8ワット-17ワット
パルス時間 0.5秒
パルス間隔 5秒
合計の列持続時間(N=10) 50秒
より大きな内容積の処置を促進するために、SAPRAシステムを使用することができる。
Claims (17)
- 生体組織を熱処理するための方法であって、
前記方法は、
波長または周波数、デューティサイクル、およびパルス列持続時間を含むエネルギーパラメーターを有するパルスエネルギー源を提供するステップであって、エネルギーパラメーターは、治療効果を達成するために最大で摂氏11°Cまで標的の組織温度を上げるように選択され、数分にわたる組織の平均温度の上昇は、標的組織を永久的に破損しないようにあらかじめ決められたレベル以下で維持される、ステップと、
標的組織を治療的に処置するために、標的組織にパルスエネルギー源を適用するステップとを含む、方法。 - 前記適用するステップは、標的組織中の熱ショックタンパク質の活性化を刺激するステップを含む、請求項1に記載の方法。
- 標的の組織温度が少なくとも標的組織へのパルスエネルギー源の適用中に、およそ摂氏6°C~摂氏11°Cの間に上げられるように、パルスエネルギー源パラメーターを選択するステップを含む、請求項1に記載の方法。
- 数分にわたる標的組織の平均温度の上昇は、摂氏6°C以下で維持される、請求項1に記載の方法。
- 標的組織の平均温度の上昇は、数分間にわたっておよそ摂氏1°C以下で維持される、請求項4に記載の方法。
- パルスエネルギー源エネルギーパラメーターは、およそ20~40ジュールのエネルギーが各立方センチメートルの標的組織に吸収されるように選択される、請求項1に記載の方法。
- パルスエネルギー源を適用するステップは、標的組織にパルスエネルギー源を適用するために身体の空洞へ装置を挿入するステップを含む、請求項1に記載の方法。
- パルスエネルギー源を適用するステップは、標的組織に隣接しているか、あるいは表面近くで血液供給がある身体の外側領域に、パルスエネルギー源を方向付けるステップを含む、請求項1に記載の方法。
- パルスエネルギー源は、レーザー光、マイクロ波、無線周波数、または超音波を含む、請求項1に記載の方法。
- パルスエネルギー源は、およそ3~6メガヘルツ(MHz)の無線周波数、およそ2.5%から5%の間のデューティサイクル、および、およそ0.2~0.4秒の間のパルス列持続時間を含む、請求項1-4、または6のいずれかに記載の方法。
- 無線周波数はおよそ2~6mmのコイル半径とおよそ13~57のアンペア回数を有する装置で生成される、請求項10に記載の方法。
- パルスエネルギー源は、およそ10~20ギガヘルツ(GHz)のマイクロ波周波数、およそ0.2~0.6秒のパルス列持続時間、およびおよそ2%~5%のデューティサイクルを含む、請求項1-4または6のいずれかに記載の方法。
- マイクロ波はおよそ8~52ワットの平均電力を有する、請求項12に記載の方法。
- パルスエネルギー源は、およそ530nm~1300nmの波長、10%未満のデューティサイクル、および、およそ0.1~0.6秒のパルス列持続時間を有するパルス光線を含む、請求項1-4または6のいずれかに記載の方法。
- パルス光線は、800nm~1000nmの波長と、およそ0.5~74ワットの電力を有する、請求項14に記載の方法。
- パルスエネルギー源は、およそ1~5MHzの周波数を有する超音波、およそ0.1~0.5秒の列持続時間、およびおよそ2%~10%のデューティサイクルを有するパルス超音波を含む、請求項1-4または6のいずれかに記載の方法。
- 超音波はおよそ0.46~28.6ワットの電力を有する、請求項16に記載の方法。
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