Blood circulation system
Inventors
NIIMI, Yoshinari • Tanaka, Katsunori • Kihara, Masahiro • KISHI, Munehiro • MARUYA, Taku • Yoshihara, Masanori • Kamiya, Masahiro
Assignees
Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-10751463-B2
Publication Date
2020-08-25
Expiration Date
Abstract
An artificial heart and lung apparatus includes a roller pump; a blood removal line; a first blood transfer line; a blood removal rate sensor; a control unit that performs the linked control of the roller pump in correspondence with a blood removal rate; and a blood transfer rate adjustment unit that instructs the roller pump to transfer a blood transfer rate. The blood transfer rate adjustment unit 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. A counter adds and subtracts pulse signals output from the operation amount input unit, and outputs a resultant as blood transfer rate adjustment data. 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
A blood circulation system that can be connected to a human body transfers removed blood to the human body via a blood transfer pump. Removed blood flows through a blood removal line to the blood transfer pump, and blood sent from the blood transfer pump is transferred through a blood transfer line to the human body. The system includes a blood removal rate sensor provided in the blood removal line and a control unit that performs linked control of the blood transfer pump in correspondence with a blood removal rate measured by the blood removal rate sensor.
The linked control is performed such that a blood transfer rate of the blood transfer pump is in a specific range with respect to the blood removal rate. 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. When blood transfer control transitions from the linked control to the normal control, blood transfer rate data relating to a linked blood transfer rate is stored in a linked blood transfer rate storage.
An operation amount input unit receives an operation amount from an arbitrary position by a manual operation and outputs a pulse signal according to the input operation amount. A counter adds and subtracts pulse signals output from the operation amount input unit and outputs resultant 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 control unit calculates the target blood transfer rate in normal control 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
The independent claim defines a blood circulation system with linked control based on a measured blood removal rate, a transition to independent normal control, and a manual operation input that is converted into pulse-count-based blood transfer rate adjustment data. The claim includes three main inventive feature groupings.
Linked control of blood transfer pump with blood removal rate
A control unit 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.
Independent normal control using stored linked blood transfer rate
For a target blood transfer rate in normal control, the blood transfer pump transfers blood independently from the blood removal rate, where linked blood transfer rate data is stored when blood transfer control transitions from the linked control to the normal control, and the target blood transfer rate is calculated based on that stored linked blood transfer rate.
Pulse-signal operation amount input with counter-based adjustment data
An operation amount input unit accepts a manually input operation amount from an arbitrary position, outputs a pulse signal according to the input operation amount, and a counter adds and subtracts pulse signals output from the operation amount input unit to output resultant blood transfer rate adjustment data that is used in normal control by addition to the stored linked blood transfer rate data.
Overall, the claim covers linked control that constrains blood transfer rate relative to a measured blood removal rate, followed by normal control in which the pump acts independently. It further specifies that during the transition the stored linked blood transfer rate provides a reference, while a pulse-output manual operation input and counter generate adjustment data that is added to compute the normal-control target blood transfer rate.
Stated Advantages
Maintains a blood transfer rate of the blood transfer pump in a specific range with respect to the blood removal rate during linked control.
Enables blood transfer rate control in normal control where the pump transfers blood independently from the blood removal rate.
Calculates the target blood transfer rate in normal control by adding adjustment data to stored data related to a linked blood transfer rate when transitioning from linked control.
Documented Applications
Artificial heart and lung apparatus operation as part of a blood circulation system connected to a human body that transfers removed blood back to the human body using a blood transfer pump (roller pump or centrifugal pump).
Interested in licensing this patent?