Peristaltic pump

• US 10,046,104 B2
• Filed: 04/16/2015
• Issued: 08/14/2018
• Est. Priority Date: 10/19/2012
• Status: Active Grant

• Current Assignee: Nikkiso Company Limited
• Original Assignee: Nikkiso Company Limited
• Inventors: Matsuo, Sumiaki, Akita, Kunihiko
• Primary Examiner(s): Freay, Charles
• Application Number:
  US14/688,064
• Publication Number:
  US 20150217040A1
• Time in Patent Office: 1,216 Days
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 5/6866 Extracorporeal blood circuits, e.g. dialysis circuits
• CPC Class Codes: A61M 1/3656 Monitoring patency or flow at connection sites; Detecting disconnections
• CPC Class Codes: A61M 2205/332 Force measuring means
• CPC Class Codes: A61M 2205/3355 Controlling downstream pump pressure
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities
• CPC Class Codes: A61M 60/113 in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: A61M 60/279 Peristaltic pumps, e.g. roller pumps
• CPC Class Codes: A61M 60/37 Haemodialysis, haemofiltration or diafiltration
• CPC Class Codes: A61M 60/554 of blood pressure
• CPC Class Codes: F04B 43/0081 systems, control, safety measures
• CPC Class Codes: F04B 43/1253 by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Abstract

A peristaltic pump includes a mounting concave section 8a 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 1a 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.

Claims

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 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.

15. The peristaltic pump according to claim 14, 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.

16. The peristaltic pump according to claim 15, further including a notification means electrically connected to the blockage detecting means.

17. The peristaltic pump according to claim 14, 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.

18. The peristaltic pump according to claim 17, further including a notification means electrically connected to the blockage detecting means.