초록 ▼

A fluid handling cassette, such as that useable with an automated peritoneal dialysis (APD) cycler device or other infusion apparatus, may include a generally planar body having at least one pump chamber formed as a depression in a first side of the body and a plurality of flowpaths for a fluid that

A fluid handling cassette, such as that useable with an automated peritoneal dialysis (APD) cycler device or other infusion apparatus, may include a generally planar body having at least one pump chamber formed as a depression in a first side of the body and a plurality of flowpaths for a fluid that includes a channel. A patient line port may be arranged for connection to a patient line and be in fluid communication with the at least one pump chamber via at least a first one of said flowpaths, and an optional membrane may be attached to the first side of the body over the at least one pump chamber. In one embodiment, the membrane may have a pump chamber portion with an unstressed shape that generally conforms to the depression of the at least one pump chamber in the body and is arranged to be movable for movement of the fluid in a useable space of the at least one pump chamber. One or more spacers may be provided in the at least one pump chamber to prevent the membrane from contacting an inner wall of the at least one pump chamber. The patient line, a drain line, and/or a heater bag line may be positioned to be separately occludable in relation to one or more solution lines that are connectable to the cassette.

대표청구항 ▼

1. A fluid handling cassette for use with a fluid handling system of a medical infusion device, the cassette comprising: a generally planar body having at least one pump chamber formed as a depression in a first side of the body and a plurality of flowpaths for a fluid that includes a channel, the a

1. A fluid handling cassette for use with a fluid handling system of a medical infusion device, the cassette comprising: a generally planar body having at least one pump chamber formed as a depression in a first side of the body and a plurality of flowpaths for a fluid that includes a channel, the at least one pump chamber including a plurality of spacer elements having ends that extend from a flat bottom inner wall of the depression, at least some of the spacer elements varying in height;a patient line port arranged for connection to a patient line, the patient line port being in fluid communication with the at least one pump chamber via at least a first one of said flowpaths;a drain line port arranged for connection to a drain line, the drain line port being in fluid communication with the at least one pump chamber via at least a second one of said flowpaths; anda flexible membrane attached to the first side of the body over the at least one pump chamber, a first portion of the flexible membrane over the at least one pump chamber being arranged to be movable for movement of the fluid in the at least one pump chamber, and second portions of the flexible membrane positioned over respective valves and movable to open and close the respective valves;wherein said first portion of the flexible membrane has a shape arranged to conform to a usable area of a corresponding pump chamber while at rest and without being stressed, the usable area of the corresponding pump chamber being defined in part by the plurality of spacer elements. 2. The cassette of claim 1, wherein the spacer elements are arranged to minimize deformation of the flexible membrane at edges of the spacer elements when the flexible membrane is forced against the spacer elements. 3. The cassette of claim 1, wherein the spacer elements are arranged in a concentric elliptical pattern. 4. The cassette of claim 3, wherein the concentric elliptical pattern of the spacer elements includes breaks in the pattern. 5. The cassette of claim 4, wherein the breaks in the pattern are symmetrical. 6. The cassette of claim 1, wherein the spacer elements vary in height such that the ends of the spacer elements increase in height from the bottom inner wall with distance away from a center of the at least one pump chamber. 7. The cassette of claim 6, wherein the ends of the spacer elements form a semi-elliptical domed shaped region. 8. The cassette of claim 1, wherein the body includes a vacuum vent clearance depression formed adjacent to, extending from, and fluidly connected to the at least one pump chamber, the vacuum vent clearance depression arranged to allow a vacuum vent port of a pump control region of a control surface to remove fluids from between the flexible membrane and the control surface without obstruction. 9. The cassette of claim 8, wherein the vacuum vent clearance depression extends outwards from the at least one pump chamber. 10. The cassette of claim 1, further comprising a plurality of solution line spikes being in fluid communication with the at least one pump chamber via at least the first one of said flowpaths. 11. A fluid handling cassette for use in a fluid handling system useable in a medical infusion application, the cassette comprising: a generally planar body having at least one pump chamber formed as a depression in a first side of the body and a plurality of flowpaths for a fluid that includes a channel, the at least one pump chamber including a plurality of spacer elements having ends that extend from a flat bottom inner wall of the depression, at least some of said spacer elements varying in height, and said at least one pump chamber including a fluid outlet;a patient line port arranged for connection to a patient line, the patient line port being in fluid communication with the at least one pump chamber via at least a first one of said flowpaths;a drain line port arranged for connection to a drain line, the drain line port being in fluid communication with the at least one pump chamber via at least a second one of said flowpaths; anda flexible membrane attached to the first side of the body over the at least one pump chamber, a first portion of the flexible membrane over the at least one pump chamber being arranged to be movable for movement of the fluid in the at least one pump chamber, and second portions of the flexible membrane positioned over respective valves and movable to open and close the respective valves;wherein said first portion of the flexible membrane has a shape arranged to conform to a usable area of a corresponding pump chamber while at rest and without being stressed, the usable area of the corresponding pump chamber being defined in part by the plurality of spacer elements, and said plurality of spacer elements are configured to inhibit the flexible membrane from covering the fluid outlet. 12. The cassette of claim 11, further comprising a plurality of solution line spikes being in fluid communication with the at least one pump chamber via at least the first one of said flowpaths. 13. A fluid handling cassette for use with a fluid handling system of a medical infusion device, the cassette comprising: a generally planar body having at least one pump chamber formed as a depression in a first side of the body and a plurality of flowpaths for a fluid that includes a channel, the at least one pump chamber including one or more spacer elements having ends that extend from an inner wall of the depression, at least some of said spacer elements varying in height;a patient line port arranged for connection to a patient line, the patient line port being in fluid communication with the at least one pump chamber via at least a first one of said flowpaths;a drain line port arranged for connection to a drain line, the drain line port being in fluid communication with the at least one pump chamber via at least a second one of said flowpaths; anda flexible membrane attached to the first side of the body over the at least one pump chamber, the flexible membrane being sealed against a periphery of the body to prevent the fluid from leaking from the cassette, a first portion of the flexible membrane over the at least one pump chamber being arranged to be movable for movement of the fluid in the at least one pump chamber, and second portions of the flexible membrane positioned over respective valves and movable to open and close the respective valves, said first portion of the flexible membrane having a shape arranged to conform to a usable area of a corresponding pump chamber while at rest and without being stressed, the usable area of the corresponding pump chamber being defined in part by the one or more spacer elements;wherein the body includes a vacuum vent clearance depression formed adjacent to, extending from, and in fluid communication with the at least one pump chamber, said vacuum vent clearance depression configured to allow a vacuum vent port of the medical infusion device to remove air or a fluid between the flexible membrane and a control surface of the medical infusion device when the fluid handling cassette is installed in the medical infusion device. 14. The cassette of claim 13, wherein the vacuum vent clearance depression extends outside of a perimeter of the at least one pump chamber.