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Publication Number
US-11040132-B2
Publication Date
2021-06-22
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/lung blood circulation system that is connected to a human body and transfers removed blood to the human body via a blood transfer pump. The system comprises a reservoir that temporarily stores the removed blood, a blood removal line that transfers the removed blood to the reservoir, and a blood line that connects the reservoir and the blood transfer pump. The stored blood is transferred from the reservoir to the human body through a blood transfer line.
A blood removal rate measurement means is provided in the blood removal line upstream of the reservoir to measure a blood removal rate parameter of removed blood flowing through the blood removal line. A controller receives the blood removal rate parameter signal and calculates a removal rate, and the controller controls a blood transfer rate of the blood transfer pump by controlling rotational speed. The control is performed such that a transfer rate of blood flowing through the blood transfer line is synchronized with a removal rate calculated from the measured blood removal rate parameter.
In embodiments described in the partial content, the blood transfer pump is used as a roller pump in a first embodiment, and as a centrifugal pump in a second embodiment. The system additionally includes optional correction process setting units that correct deviations due to measurement errors and/or pump characteristic differences between removal and transfer rate sensors, using correction process data.
Claims Coverage
The document provides two independent claims: one for a blood circulation system connected to a human body and one for a blood circulation method using such a system. The independent claims center on measuring a removal rate upstream of the reservoir and controlling pump rotational speed to synchronize the transfer rate with the calculated removal rate.
Reservoir and connected blood flow path sequence
A reservoir that temporarily stores the removed blood; a blood removal line that transfers the removed blood to the reservoir; a blood transfer pump that transfers stored blood in the reservoir to the human body; a blood line that connects the reservoir and the blood transfer pump; and a blood transfer line that transfers the stored blood to the human body, where the blood removal line, the reservoir, the blood line, the blood transfer pump and the blood transfer line are connected in the listed sequence.
Upstream removal rate measurement in blood removal line
A blood removal rate measurement means provided in the blood removal line upstream of the reservoir to measure a blood removal rate parameter of the removed blood flowing through the blood removal line.
Rotational speed control to synchronize transfer with calculated removal
A controller programmed to control a blood transfer rate of the blood transfer pump by controlling a rotational speed of the blood transfer pump with a control signal, such that a transfer rate of blood flowing through the blood transfer line is synchronized with a removal rate calculated from the blood removal rate parameter.
Roller pump for blood transfer
The blood transfer pump is a roller pump.
Tank portion structure of the reservoir
The reservoir includes a tank therein and is a portion in which blood is open to a space.
Calculation and synchronization in the blood circulation method
The method calculates a removal rate from the blood removal rate parameter and controls a blood transfer rate of the blood transfer pump by controlling a rotational speed of the blood transfer pump, such that a transfer rate of blood flowing through the blood transfer line is synchronized with the removal rate.
Overall, the claim set centers on an upstream blood removal rate measurement in the blood removal line and a controller that controls the blood transfer pump rotational speed so that the blood transfer rate in the blood transfer line is synchronized with a removal rate calculated from the measured blood removal rate parameter. The system claim further specifies a roller pump and a tank structure of the reservoir, and the method claim recites the corresponding calculating and rotational-speed-controlled synchronization steps.
Stated Advantages
Documented Applications
No documented applications found
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