Peristaltic pump comprising angularly variable pressure rollers

Patent metadata

Field	Value
Publication number	US-2016245271-A1
Application number	US-201615017927-A
Country	US
Kind code	A1
Filing date	Feb 8, 2016
Priority date	Feb 25, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

A method of conveying fluid in an apparatus for extracorporeal blood treatment is disclosed, wherein fluid is conveyed by a peristaltic pump from a low-pressure side to a high-pressure side, an elastically deformable fluid line arranged between the low-pressure side and the high-pressure side being deformed between a support surface and a rotor rotating with respect to the latter and having at least two pinch elements, wherein the pinch elements are repositioned at angles relative to each other during rotation of the rotor for causing pre-compression. A dialysis machine including a peristaltic pump conveying fluid from a low-pressure side to a high-pressure side, wherein the peristaltic pump is arranged to receive an elastically deformable fluid line between the low-pressure side and the high-pressure side and includes a support surface supporting the fluid line and a rotor is also disclosed, the rotor including at least two pinch elements each deforming the fluid line between itself and the support surface, wherein the pinch elements are formed to be repositioned at angles relative to each other in the direction of rotation.

First claim

1 - 12 . (canceled)

13 . A method of conveying fluid in an apparatus for extracorporeal blood treatment, comprising the steps of:
conveying fluid through an elastically deformable line with a peristaltic pump from a low-pressure side to a high-pressure side, the elastically deformable fluid line deformed between a support surface and a rotor rotating in a rotation direction relative to the support structure, the rotor having at least two pinch elements; repositioning the pinch elements at angles relative to each other during rotation of the rotor in the rotation direction to cause pre-compression in the elastically deformable fluid line.

14 . The method of claim 13 , wherein between two neighboring pinch elements a fluid volume to be conveyed is enclosed and subsequently a volume compression of the enclosed fluid volume results from reduction in the relative angular distance a of the two neighboring pinch elements.

15 . The method according to claim 13 , wherein a trailing pinch element is repositioned in the rotation direction relative to a leading pinch element.

16 . The method according to claim 13 , further comprising:
determining a pressure difference between the low-pressure side and the high-pressure side; wherein the repositioning of the pinch elements relative to each other is performed depending on pressure difference.

17 . The method according to claim 13 ,
determining a pressure difference between the high-pressure side and line pressure in the elastically deformable fluid line; wherein the repositioning of the pinch elements relative to each other is performed depending on pressure difference.

18 . The method according to claim 13 , wherein the high-pressure side pressure pattern is detected and the angular positioning of the pinch elements relative to each other is performed depending on the high-pressure side pressure pattern.
determining a pressure pattern in the high-pressure side; wherein the repositioning of the pinch elements relative to each other is performed depending on pressure pattern.

19 . The method according to claim 13 , further comprising:
repositioning an exiting pinch element exiting a conveying path into a neutral position relative to a leading pinch element in the conveying path.

20 . A dialysis machine comprising:
a peristaltic pump having a rotor, a low-pressure side, a high-pressure side, and a support arranged to support an elastically deformable fluid line, the peristaltic pump configured to convey fluid through the elastically deformable line from the low-pressure side to the high-pressure side; the rotor having a direction of rotation and including at least two pinch elements, each pinch element configured to deform the fluid line between itself and the support surface, the pinch elements configured to be angularly repositioned relative to each other in the direction of rotation.

21 . The dialysis machine of claim 20 , wherein the pinch elements interact with a curve actuator to reposition the pinch elements relative to each other.

22 . The dialysis machine of claim 21 , wherein the curve actuator is a curve, cam disk, or cam shaft.

23 . The dialysis machine of claim 20 , wherein each pinch element is driven by a step motor.

24 . The dialysis machine of claim 20 , wherein the dialysis machine further comprises:
at least one of an inlet pressure gauge configured to determine the inlet-side pressure, an outlet pressure gauge configured to determine the outlet-side pressure, or a line pressure gauge configured to determine line pressure in the fluid line.

25 . A controller for a dialysis machine having a peristaltic pump conveying fluid from a low-pressure side to a high-pressure side, the peristaltic pump arranged to receive an elastically deformable fluid line between the low-pressure side and the high-pressure side and the peristaltic pump including a support surface supporting the fluid line and a rotor, the rotor including at least two pinch elements, each pinch element arranged to deform the fluid line between itself and the support surface and driven by a drive unit;
the controller configured to control the drive unit such that the relative angle of the pinch elements are varied in the direction of rotation to cause pre-compression in the deformable fluid line.

26 . The controller of claim 25 , wherein the dialysis machine further includes at least one of an inlet pressure gauge for determining the inlet-side pressure, an outlet pressure gauge for determining the outlet-side pressure, or a line pressure gauge for determining line pressure the fluid line;
the controller configured to control the drive unit on the basis of the determined at least one of the inlet-side pressure, the outlet-side pressure, or the line pressure.

Assignees

• Braun Avitum Ag

Inventors

• Schaefer Oliver
• Ritter Kai-Uwe

Classifications

• F04B49/00

  Control {, e.g. of pump delivery, or pump pressure} of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 · CPC title

• A61M1/16 Primary

  with membranes · CPC title

• A61M2205/3334

  Measuring or controlling the flow rate · CPC title

• F04B49/20

  by changing the driving speed · CPC title

• A61M1/1603

  Regulation parameters · CPC title