US 12,734,282 B2Granted

Blood purification apparatus

AssigneeNikkiso Co., Ltd.

InventorsKazuya Tsuji, Takuya Maeda, Hikaru Chiaki

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Abstract

In draining liquid in an AV-coupling-type blood circuit, it is determined that the blood circuit is in an AV-coupled state. A blood purification apparatus can switch between an open state in which fluid can flow through a blood removal side circuit and a blood return side circuit and a closed state in which the fluid cannot flow therethrough. The apparatus generates a difference in pressure between the blood removal side circuit and the blood return side circuit by rotating a blood pump in the case of the closed state. The apparatus then determines whether the blood circuit is the closed circuit by switching to the open state and monitoring the difference in pressure from detecting pressure inside the blood circuit. The apparatus drains liquid remaining in the blood circuit to a predetermined drainage destination with the blood circuit forming the closed circuit.

Claims9

Dependent claims

A blood purification apparatus comprising:

a blood circuit having a blood removal side circuit into which blood removed from a patient flows and a blood return side circuit from which blood is returned to the patient and being able to form a closed circuit by having a first end portion of the blood removal side circuit and a first end portion of the blood return side circuit connected to each other via a blood purifier and by having a second end portion of the blood removal side circuit and a second end portion of the blood return side circuit connected to each other directly or indirectly;
a blood pump provided at the blood circuit;
a flow channel switch unit capable of switching between an open state in which fluid is able to flow through the first end portions of the blood removal side circuit and the blood return side circuit and a closed state in which the fluid is unable to flow through the first end portions of the blood removal side circuit and the blood return side circuit, wherein the flow channel switch unit comprises clamps attached to the blood circuit;
a pressure detection unit that detects pressure inside the blood circuit;
and
a control unit that executes a drainage process of draining liquid remaining in the blood circuit to a predetermined drainage destination with the blood circuit forming the closed circuit, wherein
the control unit further executes a determination process comprising:
generating, by the control unit, a difference in pressure between the blood removal side circuit and the blood return side circuit by rotating the blood pump with the flow channel switch unit switched to the closed state;
determining, by the control unit, whether the blood circuit is in the closed state by switching the flow channel switch unit to the open state and monitoring the difference in pressure based on a result of detection by the pressure detection unit;
and
in a case where it is determined that the blood circuit is in the closed state, executing, by the control unit, the drainage process.

8 more elements

A method executed by a blood purification apparatus including

a blood circuit having a blood removal side circuit into which blood removed from a patient flows and a blood return side circuit from which blood is returned to the patient and being able to form a closed circuit by having a first end portion of the blood removal side circuit and a first end portion of the blood return side circuit connected to each other via a blood purifier and having a second end portion of the blood removal side circuit and a second end portion of the blood return side circuit connected to each other directly or indirectly;
a blood pump provided at the blood circuit,
a flow channel switch unit capable of switching between an open state in which fluid is able to flow through the first end portions of the blood removal side circuit and the blood return side circuit and a closed state in which the fluid is unable to flow through the first end portions of the blood removal side circuit and the blood return side circuit, wherein the flow channel switch unit comprises clamps attached to the blood circuit;
a pressure detection unit that detects pressure inside the blood circuit, and
a control unit that executes a drainage process of draining liquid remaining in the blood circuit to a predetermined drainage destination with the blood circuit forming the closed circuit, the method comprising:
generating, by the control unit, a difference in pressure between the blood removal side circuit and the blood return side circuit by rotating the blood pump with the flow channel switch unit switched to the closed state;
determining, by the control unit, whether the blood circuit is in the closed state by switching the flow channel switch unit to the open state and monitoring the difference in pressure based on a result of detection by the pressure detection unit;
and
in a case where it is determined that the blood circuit is in the closed state, executing, by the control unit, the drainage process.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/562,401Filed 22 Mar 2022
Priority: JP 2021-09877014 Jun 2021
Published: US 2024/0245842 A125 Jul 2024
Granted: 15 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

A61M 1/30
Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for…:…
A61M 1/3643
Extra-corporeal blood circuits: priming, rinsing before or after use
A61M 1/3627
Extra-corporeal blood circuits: degassing devices; Buffer reservoirs; Drip chambers; Blood filters
A61M 1/3646
Mode of operation: expelling the residual body fluid after use, e.g. back to the body