Blood circulation system
Inventors
NIIMI, Yoshinari • Tanaka, Katsunori • Kihara, Masahiro • KISHI, Munehiro • MARUYA, Taku • Yoshihara, Masanori • Kamiya, Masahiro
Assignees
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Publication Number
US-11992594-B2
Publication Date
2024-05-28
Expiration Date
Abstract
An artificial heart and lung apparatus (100) includes a roller pump (120); a blood removal line (101); a first blood transfer line (104); a blood removal rate sensor (111); a control unit (140) that performs the linked control of the roller pump (120) in correspondence with a blood removal rate; and a blood transfer rate adjustment unit (160) that instructs the roller pump (120) to transfer a blood transfer rate. The blood transfer rate adjustment unit (160) includes an operation amount input unit to which an operation amount from an arbitrary circumferential position can be input, and which outputs a pulse signal according to the input operation amount, and a counter that adds and subtracts pulse signals output from the operation amount input unit, and outputs a resultant as blood transfer rate adjustment data, and the counter performs a counting operation with respect to the circumferential position of the operation amount input unit when blood transfer control transitions to the normal control.
Core Innovation
The invention relates to a blood circulation system configured to be connected to a human body and to transfer removed blood back to the human body via a blood transfer pump. The system includes a blood removal line, a blood transfer line, and a blood removal rate sensor provided in the blood removal line. A controller receives a blood removal rate signal and performs linked control of the blood transfer pump in correspondence with a blood removal rate such that a blood transfer rate of the blood transfer pump is in a specific range with respect to the blood removal rate.
For normal control, the blood transfer pump transfers blood independently from the blood removal rate. The system provides blood transfer rate data to the controller, and a linked blood transfer rate storage stores data relating to a linked blood transfer rate when blood transfer control transitions from the linked control to the normal control. In this transition context, the controller calculates a target blood transfer rate by using the stored linked blood transfer rate data.
To support transition to normal control with a user-input adjustment, an operation amount input unit is provided that allows an operation amount from an arbitrary position to be input by a manual operation. The operation amount input unit outputs a pulse signal according to the input operation amount, and a counter adds and subtracts the pulse signals to output blood transfer rate adjustment data. The counter performs a counting operation with respect to the linked blood transfer rate when the blood transfer control transitions from the linked control to the normal control, and the controller calculates the target blood transfer rate by adding the blood transfer rate adjustment data to the data relating to the linked blood transfer rate stored in the linked blood transfer rate storage.
Claims Coverage
Independent claim clm-00001 contains the core inventive structure and control transition logic. One dependent claim identified (clm-00002) further refines the operation amount input unit by specifying concrete manual input configurations.
Blood transfer pump linked control based on blood removal rate sensor
A controller includes a blood removal rate signal input interface connected to the blood removal rate sensor and performs linked control of the blood transfer pump in correspondence with a blood removal rate measured by the blood removal rate sensor such that a blood transfer rate of the blood transfer pump is in a specific range with respect to the blood removal rate.
Normal control independent of blood removal rate with linked blood transfer rate storage
For a target blood transfer rate of the blood transfer pump in normal control, the blood transfer pump transfers blood independently from the blood removal rate, and the linked blood transfer rate storage stores data relating to a linked blood transfer rate when blood transfer control transitions from the linked control to the normal control.
Manual operation amount input unit with pulse signals and counter-based adjustment data
An operation amount input unit is provided, to which an operation amount from an arbitrary position can be input by a manual operation, which outputs a pulse signal according to the input operation amount, and a counter that adds and subtracts pulse signals output from the operation amount input unit, and outputs a resultant as blood transfer rate adjustment data, wherein the counter performs a counting operation with respect to the linked blood transfer rate when the blood transfer control transitions from the linked control to the normal control.
Target blood transfer rate calculation by adding adjustment data to linked blood transfer rate data
The controller calculates the target blood transfer rate of the blood transfer pump by adding the blood transfer rate adjustment data to the data relating to the linked blood transfer rate stored in the linked blood transfer rate storage.
Operation amount input unit includes encoder/knob or increase/decrease switch
The operation amount input unit provides an operation amount input by an encoder with a knob or by a switch for increase and decrease commands.
The claim set covers a blood circulation system that links blood transfer pump rate to a sensed blood removal rate within a specific range, then transitions to normal control independent of the sensed removal rate by using stored linked blood transfer rate data. It further uses a manual operation amount input unit outputting pulse signals, with a counter producing blood transfer rate adjustment data relative to the linked blood transfer rate during the transition, and computes a target blood transfer rate by adding that adjustment to the stored linked blood transfer rate data.
Stated Advantages
Stable blood transfer (blood transfer rate maintained in a specific range with respect to the blood removal rate during linked control).
Efficient adjustment without stopping or resetting labor when transitioning from linked control to normal control.
Documented Applications
Blood circulation system connected to a human body for transferring removed blood back to the human body using a blood transfer pump (artificial heart and lung apparatus context).
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