Peritoneal dialysis patient line with sterilizing filter and drain bypass
Inventors
Norman, John • Szpara, Edward • Cazzini, Karl
Assignees
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Publication Number
US-12433979-B2
Publication Date
2025-10-07
Expiration Date
Abstract
A medical fluid treatment system includes a source of purified water; at least one concentrate for mixing with the water from the source to form a treatment fluid; a disposable set including a pumping portion, a concentrate line in fluid communication with the concentrate source and the pumping portion, and a patient line in fluid communication with the pumping portion, the patient line including a filter having a membrane configured to filter the treatment fluid, the filter configured such that (i) fresh treatment fluid flowing from the pumping portion towards a patient flows through the membrane and (ii) used treatment fluid flowing through the filter from the patient to the pumping portion bypasses the membrane; and a medical fluid delivery machine including a pump actuator operable with the pumping portion of the disposable set.
Core Innovation
The invention is directed to a peritoneal dialysis system that uses a cycler configured to pump peritoneal dialysis fluid and a disposable set configured to receive the peritoneal dialysis fluid pumped by the cycler. The disposable set includes a filter having a fresh peritoneal dialysis fluid pathway and a used peritoneal dialysis fluid pathway placed in parallel with the fresh pathway, and a membrane positioned along the fresh pathway to filter the peritoneal dialysis fluid.
Fresh peritoneal dialysis fluid is directed to flow from the cycler towards a patient through the membrane via the fresh peritoneal dialysis fluid pathway. Used peritoneal dialysis fluid bypasses the membrane via the used peritoneal dialysis fluid pathway, and a one-way valve located at or near an exit end of the fresh pathway is configured so that used peritoneal dialysis fluid bypasses the membrane while fresh peritoneal dialysis fluid is directed to flow through the membrane toward the patient.
The disclosed arrangements also describe filter housing and membrane housing structures that split fresh flow into upper and lower branches feeding upper and lower membranes separated by a grid or spacer and channels. Hydrophobic vents are used to remove air from the filter to protect the hydrophilic, microporous membranes.
Claims Coverage
The partial content includes two independent claims, each centered on a disposable peritoneal dialysis filter that filters fresh peritoneal dialysis fluid while used peritoneal dialysis fluid bypasses the membrane using a one-way valve and parallel or first-second flow pathways. Across the independent claims, there are two principal inventive feature themes.
Parallel fresh and used pathways with membrane filtration
A peritoneal dialysis system comprising a cycler configured to pump peritoneal dialysis fluid and a disposable set configured to receive the peritoneal dialysis fluid pumped by the cycler, the disposable set including a filter having a fresh peritoneal dialysis fluid pathway, a one-way valve located at or near an exit end of the fresh peritoneal dialysis fluid pathway, a used peritoneal dialysis fluid pathway placed in parallel with the fresh peritoneal dialysis fluid pathway, and a membrane located along the fresh peritoneal dialysis fluid pathway and configured to filter the peritoneal dialysis fluid.
Direction-dependent filtration with upstream membrane and downstream exit
A peritoneal dialysis system comprising a cycler configured to pump peritoneal dialysis fluid and a disposable set configured to receive the peritoneal dialysis fluid pumped by the cycler, the disposable set including a filter in which the peritoneal dialysis fluid is intended to flow in first and second directions, wherein the filter is configured to filter the peritoneal dialysis fluid flowing in the first direction and to not filter the peritoneal dialysis fluid flowing in the second direction, the filter including a filter housing, a first fluid pathway provided by the filter housing for flowing the peritoneal dialysis fluid in the first direction, a one-way valve located at or near an exit end of the first fluid pathway, a second fluid pathway provided by the filter housing for flowing the peritoneal dialysis fluid in the second direction, and a membrane positioned along the first fluid pathway upstream from the one-way valve to filter the peritoneal dialysis fluid flowing in the first direction, wherein the exit end of the first fluid pathway is located downstream from the peritoneal dialysis fluid flow through the membrane.
The claim coverage centers on a disposable filter that includes a one-way valve near the exit end of a fresh or first fluid pathway, a membrane positioned to filter the fluid in that pathway, and a parallel second or used pathway that bypasses the membrane or a second direction in which filtration is not performed.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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