Roller pump

• US 4,576,556 A
• Filed: 04/02/1980
• Issued: 03/18/1986
• Est. Priority Date: 04/02/1980
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Thompson, Howard J.
• Primary Examiner(s): Gluck, Richard E.
• Application Number:
  US06/136,812
• Time in Patent Office: 2,176 Days
• Field of Search: 417/477
• US Class Current: 417/477.12
• 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 roller pump in which one or more hoses is compressed against an arcuate stator bearing surface by a plurality of rollers carried by a rotating rotor. A shim is provided in generally opposing relation to the stator bearing surface to impart a hose compression offset force to the rotor. In this manner, the forces imparted to the rotor remain substantially constant throughout its rotation. In a preferred embodiment, a liner, which may be unitary with the shim, overlies the hoses to be compressed by the rotor to compensate for dimensional variations between the rotor rollers and for variations in the bearing surface and the hoses themselves. The thickness of the shim, at its region of greatest thickness, approximates the combined thickness of the hose, when fully compressed, and the compensating liner. Tabs are provided to extend from the shim to assist in maintaining the shim and liner in proper orientation relative to the hoses to be compressed.

Claims

1. In a medical roller pump of the type having a stator, including hose inlet and outlet means and a generally arcuate bearing surface, having hose means extending from said hose inlet means to said hose outlet means along said bearing surface, and having rotor means rotatable through 360°

, said rotor means carrying a plurality of roller means for compressing said hose means against said bearing surface, the improvement which comprises shim means including backing support means in generally opposing relation to said bearing surface for imparting a hose compression counterbalancing force to said rotor means thereby equalizing the forces imparted to said rotor means throughout its 360°

rotation.

2. The medical roller pump of claim 1 wherein the thickness of said shim means, at its region of greatest thickness, approximates the distance between a rotor roller means and said bearing surface while said rotor roller means is fully compressing said hose means.