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Publication Number
US-12268804-B2
Publication Date
2025-04-08
Expiration Date
Abstract
A blood circulation system that can be connected to a human body is provided. The system may include a roller pump, a blood removal line through which blood removed from the human body flows to the roller pump, a blood transfer line that transfers blood, which is sent from the roller pump, to the human body, means for measuring a blood removal rate provided in the blood removal line to measure a blood removal rate parameter of blood flowing through the blood removal line and a control unit, wherein the control unit is programmed to control a blood transfer rate of the roller pump by controlling a rotational speed of the roller 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.
Core Innovation
A blood circulation system connectable to a human body is configured with a roller pump and an extracorporeal blood removal line and blood transfer line. Blood removed from the human body flows through the blood removal line to the roller pump, and blood sent from the roller pump is transferred through the blood transfer line back to the human body. A blood removal rate measurement means is provided in the blood removal line to measure a blood removal rate parameter of blood flowing through the blood removal line.
A control unit controls a blood transfer rate of the roller pump by controlling a rotational speed of the roller pump with a control signal. The rotational speed control is programmed 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 measured in the blood removal line. In this way, the transfer rate follows the calculated removal rate relationship based on measurement of the removal side.
In embodiments, correction process data and a correction process setting unit are used to compensate measurement-characteristic deviations and/or pump characteristic deviations so that the transfer rate corresponds to a relationship relative to the removal rate. In another embodiment, flow rate adjustment means are provided in the blood removal line to adjust the blood removal flow, and, in embodiments for preventing undesirable behavior, a blood transfer regulator prevents backflow when the pump stops.
Claims Coverage
The document includes two independent claims: a system claim for a blood circulation system with a roller pump and synchronized control based on measured blood removal rate, and a method claim that measures, calculates, and synchronizes a blood transfer rate with the calculated removal rate. The inventive features center on synchronization of transfer with removal using a removal-side measurement and rotational speed control of the roller pump, optionally supported by correction process data and/or flow rate adjustment in the removal line.
Synchronization of transfer rate with calculated removal rate
Controlling a blood transfer rate of the roller pump by controlling a rotational speed of the roller 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.
Using correction process data to match transfer to removal relationship
Controlling the blood transfer rate of the roller pump based on a correction process controlled with correction process data such that the blood transfer rate corresponds to the blood removal rate (and/or a target relationship) calculated from the blood removal rate parameter.
Flow rate adjustment means in the blood removal line
Providing flow rate adjustment means in the blood removal line to adjust blood removal flow.
Measuring and calculating removal rate then synchronizing pump transfer rate
Measuring a blood removal rate parameter of blood flowing through the blood removal line; calculating a removal rate from the blood removal rate parameter; and controlling a blood transfer rate of the roller pump by controlling a rotational speed of the roller pump such that a transfer rate of blood flowing through the blood transfer line is synchronized with the removal rate.
Across the independent claims, the core claim coverage is synchronization: transfer rate is controlled by rotational speed of a roller pump based on removal rate calculated from a measured removal-side parameter. Dependent features described with the independent claim family add correction process data for compensating characteristic deviations and/or flow rate adjustment means in the blood removal line.
Stated Advantages
Stable blood circulation at suitable flow rates despite changes in removal rate.
Documented Applications
A blood circulation system connectable to a human body, including an artificial heart and lung apparatus context.
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