Peristaltic fluid-pumping apparatus
First Claim
1. A peristaltic pump apparatus comprising a series of bearing assemblies each having concentric inner and outer bearing members freely rotatable with respect to each other;
- a drive shaft;
said inner members of said bearing assemblies being eccentrically mounted upon said drive shaft with the centers of said inner members being equidistant from the axis of said drive shaft and spaced uniform angular distances thereabout to describe a helix about said axis;
journal means rotatably supporting said drive shaft;
power means for rotating said drive shaft;
an elastomeric membrane alongside said series of bearing assemblies;
means supporting said membrane for tangential engagement with said outer members along a first band of contact on one side of said membrane;
a straight, elongated elastomeric tube extending along and engaging the opposite side of said membrane along a second band of contact directly opposite from said first band of contact; and
platen means for supporting said tube with the longitudinal axis thereof in spaced parallel relation with respect to the rotational axis of said drive shaft and in engagement with said membrane along said second band of contact;
that portion of said first band of contact associated with each outer member oscillating from side to side in relation to said longitudinal axis of said tube when said apparatus is in operation.
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Accused Products
Abstract
An apparatus comprising a compact, portable peristaltic pump particularly suitable for medical use in infusing or removing fluids. The pump includes a series of small bearing assemblies each having concentric inner and outer members capable of free rotation with respect to each other. The inner members are eccentrically mounted upon a power-driven shaft with their centers arranged in a helix about the axis of the shaft. A thin elastomeric membrane is disposed along the series of bearing assemblies with the outer members having their surfaces tangentially engaging one side of the membrane along a first band or linear zone of contact. An elastomeric tube extends along the opposite side of the membrane, engaging that membrane along a second band or linear zone of contact directly opposite the first band of contact. A platen supports the tube so that the membrane is in constant engagement with the tube along the second band of contact, and is in either constant or periodically-interrupted engagement with the bearing assemblies along the first band of contact, during pumping operation. The disclosure also sets forth embodiments in which the membrane is preferentially reinforced and in which the apparatus includes a fluid container and a suitable patient connector for administering or removing parenteral and biological fluids.
110 Citations
35 Claims
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1. A peristaltic pump apparatus comprising a series of bearing assemblies each having concentric inner and outer bearing members freely rotatable with respect to each other;
- a drive shaft;
said inner members of said bearing assemblies being eccentrically mounted upon said drive shaft with the centers of said inner members being equidistant from the axis of said drive shaft and spaced uniform angular distances thereabout to describe a helix about said axis;
journal means rotatably supporting said drive shaft;
power means for rotating said drive shaft;
an elastomeric membrane alongside said series of bearing assemblies;
means supporting said membrane for tangential engagement with said outer members along a first band of contact on one side of said membrane;
a straight, elongated elastomeric tube extending along and engaging the opposite side of said membrane along a second band of contact directly opposite from said first band of contact; and
platen means for supporting said tube with the longitudinal axis thereof in spaced parallel relation with respect to the rotational axis of said drive shaft and in engagement with said membrane along said second band of contact;
that portion of said first band of contact associated with each outer member oscillating from side to side in relation to said longitudinal axis of said tube when said apparatus is in operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- a drive shaft;
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22. A portable linear peristaltic pump apparatus comprising a series of bearing assemblies each having an inner race, an outer race, and anti-friction bearing elements therebetween;
- a drive shaft;
said inner races of said bearing assemblies being eccentrically mounted upon said drive shaft with the centers of said inner races being equidistant from the axis of said drive shaft and spaced uniform angular distances thereabout to describe a helix about said axis;
journal means rotatably supporting said drive shaft;
power means for rotating said drive shaft;
an elastomeric membrane alongside said series of bearing assemblies;
means supporting said membrane for tangential engagement with said outer races along a first band of contact on one side of said membrane;
a straight elongated elastomeric tube having a mid-section extending along and engaging the opposite side of said membrane along a second band of contact directly opposite from said first band of contact;
means engaging and supporting said tube to maintain said mid-section thereof in stretched and tensioned condition; and
platen means engaging and bracing said tensioned mid-section of said tube with the longitudinal axis thereof in parallel relation with respect to the rotational axis of said drive shaft and in engagement with said membrane along said second band of contact;
that portion of said first band of contact associated with said outer race of each bearing assembly oscillating from side to side in relation to said longitudinal axis of said tube when said apparatus is in operation. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
- a drive shaft;
Specification