Medical peristaltic pump

• US 4,544,336 A
• Filed: 06/29/1984
• Issued: 10/01/1985
• Est. Priority Date: 04/08/1981
• Status: Expired due to Fees

• Current Assignee: Fresenius AG (Fresenius SE & Co. KGaA)
• Original Assignee: Fresenius AG (Fresenius SE & Co. KGaA)
• Inventors: Faeser, Ulrich, Mahn, Dieter
• Primary Examiner(s): Freeh, William L.
• Assistant Examiner(s): Neils, Paul F.
• Application Number:
  US06/625,585
• Time in Patent Office: 459 Days
• Field of Search: 417/234, 417/412, 417/474-477, 604/153, 222/214
• US Class Current: 417/412
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14232 Roller pumps
• 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
• CPC Class Codes: F04B 43/1284 Means for pushing the backing-plate against the tubular flexible member

Abstract

A peristaltic pump, more specially for enteral nutrition or feeding has an electric motor and a wheel, on which rollers are supported, with axis crossing the axis of the electric motor so that the main dimension of the wheel in its radial direction and the main dimension of the electric motor in its axial direction are parallel to each other or in line with each other so that a specially flat mechanical design of the pump is produced. The shaft of the electric motor has a pinion for meshing with teeth in a radial plane on the outer edge of the wheel and driving it, this producing a high step-down ratio of 1:500 or even more. The wheel with the rollers may have a generally large diameter so that it may be run at a low speed quietly. With such a diameter of the support wheel and when the pump has a flat rectangular housing, empty corners will be present in the housing on the two sides of the electric motor, into which batteries or the like may be placed. The motor may, because of the great step-down ratio, be run at a high speed so that a mass produced motor may be used for the pump. The peristaltic pump with such a flat rectangular housing may be comfortably kept under the user'"'"'s clothing without making itself seen.

Claims

1. In a peristaltic pump for medical purposes having a peristaltic flexible pipe element, a part-circular backup wall having an inwardly curved face for supporting said pipe element, a wheel with rollers for rolling said pipe elements and nipping it against said wall at a point moving along side pipe element giving a peristaltic pumping effect, and an electric motor for driving said wheel, characterized in that the wheel has an axis of turning normal to the axis of turning of said electric motor, the wheel has a gear teeth at an outer edge thereof, the electric motor has a pinion for driving said teeth with a step-down ratio of more than 1:

100, the wheel has a stub shaft, there is an U-like part with a middle part in which said stub shaft is journalled, there is a wing on said U-like part supporting said electric motor, said pinion is on an inner side of said wing and there is a second wing at an opposite end of said U-like part for supporting said backup wall movingly thereon.

4. Peristaltic pump as claimed in one of claims 1 and 2, characterized in that the pump is enclosed in a housing defining enclosed spaces on opposite sides of the electric motor for the reception of motor-powering batteries.

5. Peristaltic pump as claimed in one of claims 1 and 2, characterized in having a spring for loading said backup wall and urging it towards the rotational axis of said wheel for causing the desired nipping of said pipe element.

2. Peristaltic pump for medical purposes, especially for enteral nutrition or feeding, having a peristalic flexible pipe element co-operating along a part of its length with rollers supported on a wheel driven by an electric motor with the rollers nipping the pipe element against a part-circular backup wall giving a peristaltic pumping effect, with said motor and wall being arranged on opposite sides of the axis of rotation of said wheel and said axis being disposed normal to the axis of said motor, characterized in that said wheel, motor and wall are mounted to a common support part, said wheel has gear teeth at an outer peripheral portion thereof, said gear teeth are disposed in a substantially radial plane with respect to said axis of rotation of said wheel, said electric motor drives a pinion meshing with said gear teeth, a stub shaft is on said wheel, the support part is U-like with a middle part to which said stub shaft is journalled, a wing is on an end of said middle part supporting said electric motor with said pinion being on an inner side of said wing and including a second wing at an opposite end of said middle part for supporting said backup wall movingly thereon.

3. Peristalic pump as claimed in claim 2, characterized in that the electric motor drives the wheel with a step-down ratio of more than 1:

100.