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US 11,446,431 B2Granted
Infusion pump apparatus having convex platen surface
AssigneeZevex, Inc.
InventorsAzur Azapagic, Kent F. Beck, J. Ryan Stanfield
Life of this patent
Estimating the term…
Abstract
A peristaltic infusion pump system has a convex platen surface opposite a linear peristaltic pumping mechanism. The convex platen surface may be part of a cassette of an administration set removably loadable in an infusion pump, or the convex platen surface may be a feature of the pump itself. Pumping efficiency is improved without giving up the ability to have independently controlled compensating fingers. The convex platen surface may have a trapezoidal profile, a curved profile, or a hybrid profile having upstream and downstream inclined portions connected by an intermediate curved portion.
Claims19
A cassette for use with a pump for delivering liquid to a patient, the pump including a pumping mechanism having at least three pumping fingers and at least three cams rotatable about a cam axis to respectively actuate the at least three pumping fingers, the cassette comprising:
- a cassette body loadable in the pump, the cassette body including a platen surface having a convex surface portion having an upstream surface region, an intermediate surface region, and a downstream surface region;
- and
- a segment of resiliently deformable tubing mounted to the cassette body for conveying a flow of liquid, at least a portion of the tubing segment extending adjacent to the convex surface portion along a non-linear path determined by the convex surface portion;
- wherein the upstream surface region, the intermediate surface region, and the downstream surface region are arranged sequentially in a flow direction of liquid delivered through the segment of tubing, and the intermediate surface region connects the upstream surface region and the downstream surface region;
- wherein, when the cassette is loaded into the pump, a distance between the convex surface portion and the cam axis decreases along the upstream surface region in the flow direction;
- wherein, when the cassette is loaded into the pump, the distance between the convex surface portion and the cam axis does not increase along the intermediate surface region in the flow direction;
- wherein, when the cassette is loaded into the pump, the distance between the convex surface portion and the cam axis increases along the downstream surface region in the flow direction;
- and
- wherein, when the cassette is loaded into the pump, the upstream surface region is opposite a first pumping finger of the at least three pumping fingers, the intermediate surface region is opposite a second pumping finger of the at least three pumping fingers, and the downstream surface region is opposite a third pumping finger of the at least three pumping fingers.
6 more elements
An apparatus for delivering liquid to a patient, the apparatus comprising:
- a segment of resiliently deformable tubing for conveying a flow of liquid in a flow direction,
- a platen surface including a convex surface portion, the convex surface portion having an upstream surface region, an intermediate surface region, and a downstream surface region, wherein the upstream surface region, the intermediate surface region, and the downstream surface region are arranged sequentially in the flow direction, and the intermediate surface region connects the upstream surface region and the downstream surface region;
- and
- a peristaltic pumping mechanism having at least three pumping fingers and at least three cams rotatable about a cam axis to respectively actuate the at least three pumping fingers, wherein the at least three fingers are opposite the convex surface portion;
- wherein at least a portion of the tubing segment extends adjacent to the convex surface portion along a non-linear path determined by the convex surface portion and is arranged between the convex surface portion and the at least three pumping fingers for engagement by the at least three pumping fingers;
- wherein a distance between the convex surface portion and the cam axis decreases along the upstream surface region in the flow direction;
- wherein the distance between the convex surface portion and the cam axis does not increase along the intermediate surface region in the flow direction;
- wherein the distance between the convex surface portion and the cam axis increases along the downstream surface region in the flow direction;
- and
- wherein the upstream surface region is opposite a first pumping finger of the at least three pumping fingers, the intermediate surface region is opposite a second pumping finger of the at least three pumping fingers, and the downstream surface region is opposite a third pumping finger of the at least three pumping fingers.
7 more elements
An apparatus for delivering liquid to a patient, the apparatus comprising:
- a segment of resiliently deformable tubing for conveying a flow of liquid in a flow direction,
- a platen surface including a convex surface portion, the convex surface portion having an upstream surface region, an intermediate surface region, and a downstream surface region, wherein the upstream surface region, the intermediate surface region, and the downstream surface region are arranged sequentially in the flow direction, and the intermediate surface region connects the upstream surface region and the downstream surface region;
- and
- a peristaltic pumping mechanism having at least three pumping fingers and at least three cams rotatable about a cam axis to respectively actuate the at least three pumping fingers, wherein the at least three fingers are opposite the convex surface portion;
- wherein at least a portion of the tubing segment extends adjacent to the convex surface portion along a non-linear path determined by the convex surface portion and is arranged between the convex surface portion and the at least three pumping fingers for engagement by the at least three pumping fingers;
- wherein a distance between the convex surface portion and the cam axis decreases along the upstream surface region in the flow direction;
- wherein the distance between the convex surface portion and the cam axis does not increase along the intermediate surface region in the flow direction;
- wherein the distance between the convex surface portion and the cam axis increases along the downstream surface region in the flow direction;
- and
- wherein the upstream surface region is opposite a first pumping finger of the at least three pumping fingers, the intermediate surface region is opposite a second pumping finger of the at least three pumping fingers, and the downstream surface region is opposite a third pumping finger of the at least three pumping fingers;
- and
- wherein the at least three cams are coupled to a drive shaft for rotation about the cam axis to cyclically drive the at least three pumping fingers into engagement with the tubing segment, the at least three cams including a pair of end cams and at least one intermediate cam between the pair of end cams, wherein at least one of the pair of end cams has a cam stroke greater than a cam stroke of each intermediate cam.
9 more elements
Dependencies are inferred from the claim text.