Peristaltic pump

Patent metadata

Field	Value
Publication number	US-10046104-B2
Application number	US-201514688064-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	Oct 19, 2012
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A peristaltic pump includes a mounting concave section 8 a on which a peristaltically-actuated tube connected to an arterial blood circuit is mountable; a roller which compresses the peristaltically-actuated tube mounted on the mounting concave section in a radial direction and causes the peristaltically-actuated tube to be peristaltically actuated in a longitudinal direction such that a liquid therein is flowable in the arterial blood circuit; a load sensor that is able to detect displacement of the peristaltically-actuated tube 1 a mounted on the mounting concave section in the radial direction; and blockage detecting means that is able to detect a blockage of the arterial blood circuit based on the displacement detected by the load sensor.

First claim

The invention claimed is:

1. A peristaltic pump comprising:
a) a mounting concave section configured to mount a peristaltically-actuated tube connected to an arterial blood circuit, the arterial blood circuit including a liquid flow route through which a predetermined liquid is circulatable;
b) a peristalsis section which compresses the peristaltically-actuated tube mounted on the mounting concave section in a radial direction and causes the peristaltically-actuated tube to be peristaltically actuated in a longitudinal direction along the peristaltically-actuated tube such that a liquid therein flows in the liquid flow route;
c) a displacement detecting means configured to detect displacement of the peristaltically-actuated tube mounted on the mounting concave section in the radial direction; and
d) a blockage detecting means configured to detect a blockage of the liquid flow route based on the displacement detected by the displacement detecting means; and
wherein the peristaltically-actuated tube is connected to an intermediate portion of the arterial blood circuit for extracorporeally circulating blood of a patient at time of blood purification treatment and is configured so that a blockage of the arterial blood circuit during the blood purification treatment and a blockage of the arterial blood circuit at time of returning blood after the blood purification treatment is detectable;
the peristaltic pump further comprising:
grasping means for grasping the peristaltically-actuated tube mounted on the mounting concave section,
wherein the displacement detecting means is able to detect displacement of a portion grasped by the grasping means in the radial direction; and
wherein the grasping means has a grasping piece that presses the peristaltically-actuated tube in the radial direction so as to grasp the peristaltically-actuated tube and biasing means that biases the grasping piece against the peristaltically-actuated tube and the displacement detecting means detects a load applied on a fixed end side of the biasing means and detects displacement of the peristaltically-actuated tube in the radial direction based on the detected load.

2. The peristaltic pump according to claim 1 , further comprising:
a rotor including a plurality of peristalsis sections,
wherein the rotor rotates in the mounting concave section, and thereby, the peristaltically-actuated tube mounted on the mounting concave section is peristaltically actuated by the plurality of peristalsis sections in a cycle, and the blockage detecting means performs detection of a blockage of the liquid flow route, based on an output waveform obtained by a continuous detection of the displacement performed by the displacement detecting means while the rotor is rotated such that the peristaltically-actuated tube is peristaltically actuated by the plurality of peristalsis sections.

3. The peristaltic pump according to claim 2 , wherein the blockage detecting means detects a blockage of the liquid flow route based on an amplitude or a cycle of the output waveform.

4. A blood purification apparatus comprising:
the peristaltic pump to claim 1 .

5. The peristaltic pump according to claim 1 , wherein the displacement detecting means detects displacement of the peristaltically-actuated tube mounted on the mounting concave section in the radial direction based on a detected load or a detected pressure.

6. The peristaltic pump according to claim 5 , wherein the displacement detection means is a load sensor and the blockage detecting means is configured of a microcomputer and wherein the blockage detecting means is electrically connected to the displacement detection means.

7. The peristaltic pump according to claim 6 , further including a notification means electrically connected to the blockage detecting means.

8. The peristaltic pump according to claim 5 , wherein the displacement detection means is a pressure transducer and the blockage detecting means is configured of a microcomputer and wherein the blockage detecting means is electrically connected to the displacement detection means.

9. The peristaltic pump according to claim 8 , further including a notification means electrically connected to the blockage detecting means.

10. A peristaltic pump comprising:
a) a mounting concave section configured to mount a peristaltically-actuated tube connected to an arterial blood circuit, the arterial blood circuit including a liquid flow route through which a predetermined liquid is circulatable;
b) a peristalsis section which compresses the peristaltically-actuated tube mounted on the mounting concave section in a radial direction and causes the peristaltically-actuated tube to be peristaltically actuated in a longitudinal direction along the peristaltically-actuated tube such that a liquid therein flows in the liquid flow route;
c) a displacement detecting means configured to detect displacement of the peristaltically-actuated tube mounted on the mounting concave section in the radial direction; and
d) a blockage detecting means configured to detect a blockage of the liquid flow route based on the displacement detected by the displacement detecting means; and
wherein the peristaltically-actuated tube is connected to an intermediate portion of the arterial blood circuit for extracorporeally circulating blood of a patient at time of blood purification treatment and is configured so that a blockage of the arterial blood circuit during the blood purification treatment and a blockage of the arterial blood circuit at time of returning blood after the blood purification treatment is detectable;
the peristaltic pump further comprising:
grasping means for grasping the peristaltically-actuated tube mounted on the mounting concave section,
wherein the displacement detecting means is able to detect displacement of a portion grasped by the grasping means in the radial direction; and
wherein the grasping means has a grasping piece that presses the peristaltically-actuated tube in the radial direction so as to grasp the peristaltically-actuated tube and biasing means that biases the grasping piece against the peristaltically-actuated tube and the displacement detecting means is provided on a portion facing the grasping piece with the peristaltically-actuated tube interposed therebetween, detects pressure which is imparted on a side surface of the peristaltically-actuated tube pressed by the grasping piece, and detects displacement of the peristaltically-actuated tube in the radial direction based on the detected pressure.

11. The peristaltic pump according to claim 10 , further comprising:
a rotor including a plurality of peristalsis sections,
wherein the rotor rotates in the mounting concave section, and thereby, the peristaltically-actuated tube mounted on the mounting concave section is peristaltically actuated by the plurality of peristalsis sections in a cycle, and the blockage detecting means performs detection of a blockage of the liquid flow route, based on an output waveform obtained by a continuous detection of the displacement performed by the displacement detecting means while the rotor is rotated such that the peristaltically-actuated tube is peristaltically actuated by the plurality of peristalsis sections.

12. The peristaltic pump according to claim 11 , wherein the blockage detecting means detects a blockage of the liquid flow route based on an amplitude or a cycle of the output waveform.

13. A blood purification apparatus comprising:
the peristaltic pump according to claim 10 .

14. The peristaltic pump according to claim 10 , wherein the displacement detecting means detects di

Assignees

• Nikkiso Co Ltd

Inventors

• Matsuo Sumiaki
• Akita Kunihiko

Classifications

• A61M1/1006

  Human Necessities · mapped topic

• A61M2205/3355

  Controlling downstream pump pressure · CPC title

• A61M1/1086

  Human Necessities · mapped topic

• A61B5/6866 Primary

  Extracorporeal blood circuits, e.g. dialysis circuits · CPC title

• A61M2205/332

  Force measuring means · CPC title