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Publication Number
US-11141519-B2
Publication Date
2021-10-12
Expiration Date
Abstract
Disclosed is an artificial heart and lung apparatus (100) that can be connected to a patient (P), and transfers removed blood to a human body via a roller pump (120), the system including: the roller pump (120); a blood removal line (101) which transfers removed blood to the roller pump (120); a first blood transfer line (104) that transfers blood, which is transferred from the roller pump (120), to the human body; a blood removal rate sensor (111) that is provided in the blood removal line (101); and a control unit (140), in which the control unit (140) performs control such that a blood transfer rate of the roller pump (120) is in a specific range with respect to a blood removal rate measured by a blood removal rate sensor (111).
Core Innovation
The invention relates to an artificial heart and lung apparatus including a blood circulation system that can be connected to a human body. Blood removed from the human body flows through a blood removal line to a blood transfer pump, and blood sent from the blood transfer pump is transferred to the human body through a blood transfer line.
The apparatus includes blood removal rate measurement means provided in the blood removal line to measure a blood removal rate parameter, and blood transfer rate measurement means provided in the blood transfer line to measure a blood transfer rate parameter. A control unit controls a blood transfer rate of the blood transfer pump by controlling a rotation speed of the blood transfer pump with a control signal, such that a transfer rate calculated from the blood transfer rate parameter is synchronized with a removal rate calculated from the blood removal rate parameter.
The control is further described with correction process setting units that compensate deviations of sensor/pump characteristics using correction process data. Flow rate adjustment means are provided for adjusting a removal rate and/or a transfer rate, and to prevent backflow when the blood transfer pump is stopped.
The described circulation maintains blood transfer matching the removal rate when the removal rate changes, thereby achieving stable circulation at suitable flow rates.
Claims Coverage
The independent claims cover two inventive aspects: a connectable blood circulation system and a method implementing the same synchronization. The main inventive features comprise rate measurement in both lines and rotation-speed control to synchronize calculated transfer and removal rates, with dependent claims adding correction-process control, specifying a centrifugal pump, and adding flow-rate adjustment means in the removal line and/or the transfer line.
Synchronizing transfer rate with removal rate via rotation-speed control
A blood circulation system that measures a blood removal rate parameter in a blood removal line and a blood transfer rate parameter in a blood transfer line, calculates a removal rate and a transfer rate from the respective parameters, and controls a blood transfer pump by controlling a rotation speed so that a transfer rate synchronized with a removal rate is achieved.
Correction-process control using correction process data
A blood circulation system including a correction process setting unit that uses correction process data to control the blood transfer pump so that a blood transfer rate corresponds to a blood removal rate.
Centrifugal blood transfer pump controlled by rotational speed
The blood transfer pump is a centrifugal pump, and the control unit regulates the centrifugal pump by controlling a rotational speed.
Flow-rate adjustment means in the blood removal line
The blood circulation system includes flow-rate adjustment means provided in the blood removal line to adjust a blood removal rate.
Flow-rate adjustment means in the blood transfer line
The blood circulation system includes flow-rate adjustment means provided in the blood transfer line to adjust a blood transfer rate.
Method for synchronizing transfer rate with removal rate by measuring and rotating the pump
A blood circulation method that measures a blood removal rate parameter of blood flowing through a blood removal line and a blood transfer rate parameter of blood flowing through a blood transfer line, calculates a removal rate and a transfer rate, and controls a blood transfer pump by controlling a rotational speed so that the transfer rate is synchronized with the removal rate.
Overall claim coverage centers on measuring removal and transfer rate parameters in respective lines and synchronizing calculated transfer and removal rates by rotation-speed control of the blood transfer pump. Dependent coverage adds correction-process control via correction process data, specifies the blood transfer pump as a centrifugal pump with rotational-speed regulation, and introduces flow-rate adjustment means in the blood removal line and/or the blood transfer line.
Stated Advantages
Stable blood circulation by synchronizing blood transfer matching the removal rate when the removal rate changes during surgery.
Stable circulation at suitable flow rates.
Documented Applications
Artificial heart and lung apparatus for blood circulation connected to a human body, including blood removal and blood transfer using a blood transfer pump and controlled synchronization of transfer and removal rates.
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