Magnetically balanced finger-type peristaltic pump

• US 9,056,160 B2
• Filed: 09/01/2013
• Issued: 06/16/2015
• Est. Priority Date: 11/13/2006
• Status: Active Grant

• Current Assignee: Eitan Medical Limited
• Original Assignee: Q Core Medical Ltd.
• Inventors: Rotem, Shachar, Goldor, Ori
• Primary Examiner(s): COMLEY, ALEXANDER BRYANT
• Application Number:
  US14/016,105
• Publication Number:
  US 20140005631A1
• Time in Patent Office: 653 Days
• Field of Search: 417/477.1, 417/374, 417/474
• US Class Current: 1/1
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• CPC Class Codes: F04B 43/0072 of tubular flexible members
• CPC Class Codes: F04B 43/0081 systems, control, safety measures
• CPC Class Codes: F04B 43/08 having tubular flexible members F04B43/12 takes precedence
• CPC Class Codes: F04B 43/082 the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism
• CPC Class Codes: F04B 43/1223 the actuating elements, e.g. rollers, moving in a straight line during squeezing

Abstract

A peristaltic pump includes a plurality of effecters, actuated in a periodic manner upon by obstructive forces of a flexible infusion tube so as flow of infusion fluid is provided along said infusion tube, the magnitude of the obstructive forces being dependent upon the displacement of said moving effecters; and a plurality of balancing magnets providing balancing forces upon one or all the moving effecters, the balancing forces at each point along the path of motion of the moving effecters being of approximately equal magnitude to that of the obstructive forces at the point; such that the parasitic output due to work performed against the obstructive forces is approximately zero and yield is maximized.

Claims

1. A peristaltic pump comprising:

a fluid flow channel including a flexible segment;

at least one effecter including a ferrite member and adapted to intermittently compress the flexible segment within said channel, wherein compression of the flexible segment produces a reactive force;

at least one electrically triggerable actuator to apply a mechanical force on said effecter; and

a balancing member to magnetically interact with said ferrite member in said at least one effecter so that a balancing force proportional to the mechanical force on said effecter is produced to substantially counter said reactive force of the flexible segment.

2. The peristaltic pump as in claim 1, wherein the fluid flow channel includes a silicon element.

3. The peristaltic pump as in claim 1, wherein the fluid flow channel has at least a first cross-sectional geometry.

4. The peristaltic pump as in claim 3, wherein the at least first fluid flow channel cross-sectional geometry includes a round cross section.

5. The peristaltic pump as in claim 3, wherein the at least first fluid flow channel cross-sectional geometry includes a rectangular cross section.

6. The peristaltic pump as in claim 3, further comprising an at least second cross-sectional geometry along a length of the channel and said second cross-sectional geometry is different than said first cross-sectional geometry.

7. The peristaltic pump as in claim 1, wherein said at least one effecter is a pressing finger.

8. The peristaltic pump as in claim 1, wherein said ferrite member is a magnetic material and said balancing member includes a metallic material.

9. The peristaltic pump as in claim 1, wherein said ferrite member is a metallic material and said balancing member includes a magnetic material.

10. The peristaltic pump as in claim 1, wherein said ferrite member is a magnetic material and said balancing member includes a magnetic material.

11. The peristaltic pump as in claim 1, wherein said at least one effecter periodically moves relatively to the flexible segment, and said magnetically interacting includes producing a balancing force to substantially counter said reactive force of the flexible segment while the at least one effecter moves.

12. The peristaltic pump as in claim 11, wherein said balancing force substantially counters said reactive force while the at least one effecter moves in forth or backward movement.

13. The peristaltic pump according to claim 1, wherein said balancing member produces a permanent magnetic field.

14. The peristaltic pump according to claim 1, wherein said balancing member is attracted to a magnetic field.