JP7376109B2 - 移植された血管補助システムおよび移植可能な血管補助システムを流れる流体の流量を決定する方法 - Google Patents
移植された血管補助システムおよび移植可能な血管補助システムを流れる流体の流量を決定する方法 Download PDFInfo
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- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/06—Measuring blood flow
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- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
- A61M60/178—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
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- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/686—Permanently implanted devices, e.g. pacemakers, other stimulators, biochips
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- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
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- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
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- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/81—Pump housings
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Description
補助システムの超音波センサによって、第一のパルス繰返し速度で第一のパルスドップラー測定を実行する工程a)と、
補助システムの超音波センサによって、第二のパルス繰返し速度で第二のパルスドップラー測定を実行する工程であって、第二のパルス繰返し速度が第一のパルス繰返し速度とは異なる、工程b)と、
第一のパルスドップラー測定および第二のパルスドップラー測定の測定結果を使用して流量を決定する工程c)とを含む。
異なるパルス繰返し速度でパルスドップラー測定を実行するように設計された超音波センサと、
異なるパルス繰返し速度での前記パルスドップラー測定の測定結果を使用して、前記補助システムを通って流れる流体の流量を決定するように設計された処理ユニットと、を備える。
・直径入口領域または測定範囲、例えば、5mm、
・測定される最大血流、例えば、Q=9l/分、
・結果としての最大血流量:vblood、max=7.64m/s、
・血液中の音速、例えば、cblood=1,540m/s、
・超音波周波数、例えば、f0=6MHz、
・観察窓の開始からの超音波素子の距離、例えば、25mm、
・発信された超音波PWDパルス当たりの超音波振動サイクル数、例えば、10、
・結果として生じるバースト長さ(距離)lburst=c0×10/f0=2.57mm、
・結果として生じる最大伝播距離超音波バーストd=55.13mm。
・パルスドップラー測定、またはPWDベースの流量測定、または体積流測定は、測定窓と超音波振動子との間に大きな距離があっても可能となる。
・補助システムの幾何学的境界条件に基づく、ドップラーシフトの幾何学的に誘発されたあいまいさの解決。
Claims (9)
- 心臓補助システム(1)の作動を制御する方法であって、前記方法は、
前記心臓補助システム(1)の超音波センサ(2)によって、第一のパルス繰返し速度PRF1で第一のパルスドップラー測定を実行する工程a)と、
前記心臓補助システム(1)の前記超音波センサ(2)によって、第二のパルス繰返し速度PRF2>PRF1で第二のパルスドップラー測定を実行する工程であって、前記第二のパルス繰返し速度は前記第一のパルス繰返し速度とは異なる、工程b)と、
前記心臓補助システム(1)の処理ユニット(3)が、整数n1、n2および前記第一のパルスドップラー測定の主周波数成分f1および前記第二のパルスドップラー測定の主周波数成分f2を解くことにより、前記第一のパルスドップラー測定および前記第二のパルスドップラー測定の測定結果を使用して前記心臓補助システム(1)を流れる流体の流量vを決定することであって、以下の線形ディオファントス方程式を使用して決定する工程c)とを含むことにより特徴付けられる、方法:
- 前記二つの工程a)およびb)のうちの少なくとも一つにおいて、新しい超音波パルスが、直前に発信された該超音波パルスのエコーが受信された後にのみ発信されることにより特徴付けられる、請求項1に記載の方法。
- PRF 1 またはPRF 2 は、最大発生ドップラーシフトの二倍未満であることにより特徴付けられる、請求項1または2に記載の方法。
- 前記工程c)において、前記パルスドップラー測定のドップラー周波数スペクトル(4)の検出された主周波数成分(14)と、前記パルスドップラー測定に適用される前記パルス繰返し速度との間の相関が使用されることにより特徴付けられる、請求項1~3のいずれか一項に記載の方法。
- 前記線形ディオファントス方程式は、ベズー係数または取り尽くし法を使用して求解されることにより特徴付けられる、請求項1~4のいずれか一項に記載の方法。
- 前記流量vに基づいて前記心臓補助システム(1)を通る流体体積流を決定することをさらに含む、請求項1~5のいずれか一項に記載の方法。
- 超音波センサ(2)を備え、処理ユニット(3)を備える移植可能な血管補助システム(1)であって、
前記超音波センサ(2)は、異なるパルス繰返し速度PRF1<PRF2でパルスドップラー測定を実行するように設計されることと、
前記処理ユニット(3)は、前記異なるパルス繰返し速度での前記パルスドップラー測定の測定結果を使用して、前記血管補助システム(1)を流れる流体の流量を決定するように設計されることとにより特徴付けられ、
第一のパルスドップラー測定および第二のパルスドップラー測定の測定結果を使用して前記流量を決定することは、前記第一のパルスドップラー測定の整数n1、n2および主周波数成分f1、および前記第二のパルスドップラー測定の主周波数成分f2を解くことによって以下の線形ディオファントス方程式によって実行される、移植可能な血管補助システム:
- 前記線形ディオファントス方程式は、ベズー係数または取り尽くし法を使用して求解されることにより特徴付けられる、請求項7に記載の移植可能な血管補助システム。
- 前記処理ユニット(3)は、前記流量から計算された流体流を提供するように設計されることにより特徴付けられる、請求項7または8に記載の移植可能な血管補助システム。
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DE102018208929.9A DE102018208929A1 (de) | 2018-06-06 | 2018-06-06 | Verfahren zur Bestimmung einer Strömungsgeschwindigkeit eines durch ein implantiertes, vaskuläres Unterstützungssystem strömenden Fluids |
DE102018208929.9 | 2018-06-06 | ||
PCT/EP2019/064804 WO2019234164A1 (de) | 2018-06-06 | 2019-06-06 | Verfahren zur bestimmung einer strömungsgeschwindigkeit eines durch ein implantiertes, vaskuläres unterstützungssystem strömenden fluids und implantierbares vaskuläres unterstützungssystem |
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DE102018208538A1 (de) | 2018-05-30 | 2019-12-05 | Kardion Gmbh | Intravasale Blutpumpe und Verfahren zur Herstellung von elektrischen Leiterbahnen |
DE102018208945A1 (de) | 2018-06-06 | 2019-12-12 | Kardion Gmbh | Analysevorrichtung und Verfahren zum Analysieren einer Viskosität eines Fluids |
DE102018208929A1 (de) | 2018-06-06 | 2019-12-12 | Kardion Gmbh | Verfahren zur Bestimmung einer Strömungsgeschwindigkeit eines durch ein implantiertes, vaskuläres Unterstützungssystem strömenden Fluids |
DE102018208936A1 (de) | 2018-06-06 | 2019-12-12 | Kardion Gmbh | Bestimmvorrichtung und Verfahren zum Bestimmen einer Viskosität eines Fluids |
DE102018210076A1 (de) | 2018-06-21 | 2019-12-24 | Kardion Gmbh | Verfahren und Vorrichtung zum Erkennen eines Verschleißzustands eines Herzunterstützungssystems, Verfahren und Vorrichtung zum Betreiben eines Herzunterstützungssystems und Herzunterstützungssystem |
EP4247474A2 (en) | 2020-11-20 | 2023-09-27 | Kardion GmbH | Mechanical circulatory support system with insertion tool |
US20230173250A1 (en) | 2021-12-03 | 2023-06-08 | Kardion Gmbh | Cardiac pump with optical fiber for laser doppler |
DE102023118223A1 (de) | 2022-07-11 | 2024-01-11 | Kardion Gmbh | Laser-doppler-velozimetrie-durchflussmessung |
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EP3801276A1 (de) | 2021-04-14 |
WO2019234164A1 (de) | 2019-12-12 |
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