Peristaltic pump having pumping and occluding rollers and alternating pumping systems utilizing thereof

• US 7,578,662 B1
• Filed: 11/18/2005
• Issued: 08/25/2009
• Est. Priority Date: 11/18/2005
• Status: Active Grant

• Current Assignee: Araz Ibragimov
• Original Assignee: Araz Ibragimov
• Inventors: Ibragimov, Araz
• Primary Examiner(s): Kramer; Devon C
• Assistant Examiner(s): BOBISH, CHRISTOPHER S
• Application Number:
  US11/283,323
• Time in Patent Office: 1,376 Days
• Field of Search: 417/474, 4174771-4478, 417/476, 417/478, 417/479, 604/151, 604/156
• US Class Current: 417/477.3
• CPC Class Codes: F04B 43/1246 the roller being placed at the outside of the tubular flexible member
• CPC Class Codes: F04B 45/08 having peristaltic action

Abstract

A peristaltic roller pump includes a rotor carrying a pumping roller on one end and an occluding roller on the other end. Occluding roller has a number of protrusions designed to only occlude the tubing section that is located under that roller as it moves over it in order to prevent any back flow through that section of the tube. Occluding roller is designed to not cause any pumping of fluid through the section of the tubing under that roller. Such design is useful in a single-needle dialysis system and in other alternating pumping systems in which during a first phase of the pumping the fluid is moved in one direction and during the second phase of operation the fluid is moved in the opposite direction.

Claims

1. A peristaltic roller pump comprising:

a housing with an internal circular opening, said opening including a first half and a second half,

a first elastic tubing section placed along and in contact with said first half of said circular opening, said first elastic tubing section having a first inlet and a first outlet,

a second elastic tubing section placed along and in contact with said second half of said circular opening, said second elastic tubing section having a second inlet and a second outlet, said first outlet is not connected directly to said second inlet, and

a rotor assembly including a rotor having a rotor center placed in the center of said circular opening, said rotor being driven by a shaft attached at said rotor center, said rotor also having a first arm and a second arm extending from said center in the opposite directions, said first arm carrying a freely rotating occluding roller, said second arm carrying a freely rotating pumping roller,

said occluding roller comprising a central portion and a plurality of protrusions extending therefrom, said protrusions are spaced apart to allow a portion of said elastic tubing between adjacent protrusions to regain at least part of its non-compressed shape when compressed by said adjacent protrusions,

whereby said roller pump is adapted for alternating pumping in two phases, a first phase defined by progressive squeezing of said first elastic tubing section by said pumping roller to cause flow therein from said first inlet to said first outlet and occluding of said second elastic tubing section by said occluding roller to prevent any flow therein from said second inlet to said second outlet, and a second phase defined by progressive squeezing of said second elastic tubing section by said pumping roller to cause flow therein from said second inlet to said second outlet and occluding of said first elastic tubing section by said occluding roller to prevent any flow therein from said first inlet to said first outlet.

2. The peristaltic roller pump as in claim 1, wherein each or said protrusion of said occluding roller has a shape of a tooth.