Variable roller pump tubing

• US 4,954,055 A
• Filed: 06/22/1989
• Issued: 09/04/1990
• Est. Priority Date: 06/22/1989
• Status: Expired due to Term

• Current Assignee: Jostra Bentley, Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Morrow, William K., Raible, Donald A.
• Primary Examiner(s): Smith, Leonard E.
• Assistant Examiner(s): Szczecina, Jr., Eugene L.
• Application Number:
  US07/369,806
• Time in Patent Office: 439 Days
• Field of Search: 417/474-479, 138/109, 138/118, 138/119, 138/177, 138/178, 604/153, 251/6, 428/36.9, 428/36.92
• US Class Current: 417/477.5
• CPC Class Codes: F04B 43/0072 of tubular flexible members

Abstract

A variable diameter tube for use with a roller pump which is formed with a central large diameter section that is positioned in the roller pump raceway. This tube is formed with two end portions of substantially similar internal diameter with the diameter of the tube gradually increasing towards the central section. The gradual increase in diameter is no greater than about thirty degrees per inch and the wall thickness of the tubing wall is substantially equivalent along its entire length.

Claims

1. A roller pump assembly comprising:

a pump head assembly having a tube raceway along which one or more pump rollers travel; and

a variable diameter tubing having a substantially constant wall thickness situated which is formed with two end portions having substantially similar internal diameters and a central larger diameter section situated between said two end portions, said larger diameter central section gradually increasing in diameter from each of said end portions, with said gradual increase in diameter being at a rate of no greater than about thirty degrees per inch, and wherein said tubing central section is dimensioned to lie substantially along the entire length of said raceway.

3. The roller pump assembly of claim 1 wherein said gradual tapering is from about 2°

to about 15°

per inch.

2. A variable diameter tube for positioning along a raceway of a roller pump assembly comprising:

a tube having a substantially constant wall thickness formed with two end portions of substantially similar internal diameter and a section formed intermediate said two end portions having a larger internal diameter, which intermediate section is dimensioned to lie along substantially the entire length of said pump raceway, said end portions and said central sections being joined by an intermediate portion which gradually increases in diameter from said end portions to said central section at a rate of no greater than about thirty degrees per inch.

4. The roller pump assembly of claim 2 wherein said gradual tapering is from about 2°

to about 15°

per inch.