Patent Application
20180043081
The invention relates to devices, systems, and methods for generating a peritoneal dialysate having purity and sterility characteristics suitable for Peritoneal Dialysis (PD). The peritoneal dialysate can be generated from water of variable quality using a purity control system having one or more ultrafilters for sterilization of the peritoneal dialysate Peritoneal dialysate generation system and related methods are described that can generate sterilized peritoneal dialysate and deliver peritoneal dialysis therapy to a patient.
Peritoneal Dialysis (PD), including Automated Peritoneal Dialysis (APD) and Continuous Ambulatory Peritoneal Dialysis (CAPD), can be performed in a clinic or in an at home setting, either by a patient alone or with a care-giver. PD differs from Hemodialysis (HD) in that blood is not removed from the body and passed through a dialyzer, but rather a catheter is placed in the peritoneal cavity and dialysate introduced directly into the peritoneal cavity. Blood is cleaned inside the patient using the patient's own peritoneum as a type of dialysis membrane. However, because fluid is directly introduced into a human body, the fluid used for peritoneal dialysate is generally required to be free of biological and chemical contaminants. The peritoneal dialysate should also contain specified concentrations of solutes and cations for biocompatibility and for performing membrane exchange.
Peritonitis is a serious and common problem in the PD population that results in abdominal pain, fever, and cloudy dialysate. Peritonitis remains a leading complication of PD with around 18% of infection-related mortality in PD patients resulting from peritonitis (Fried et al., “Peritonitis influences mortality in peritoneal dialysis patients,” J. Am. Soc. Nephrol. 1996; 7:2176-2182). Moreover, peritonitis is a contributing factor to death in 16% of deaths on PD, and remains a major cause for patients discontinuing PD and switching to HD. Peritonitis and other peritoneal dialysis complications can often be traced to non-sterile techniques and/or contaminated starting dialysate.
The US FDA regulates pre-packaged dialysate for use in PD as a Class II drug if the pre-packaged dialysate is used in either a semi-automatic PD system or an automatic PD system (e.g., cycler system). See 21 C.F.R. Sec. 876.5630. If the peritoneal dialysate is not pre-packaged, the US FDA requires the dialysate be prepared from a dialysate concentrate and “sterile purified water,” which is defined by the FDA in 21 C.F.R. Sec. 165.110(a)(2)(iv) and (vii). Some possible contaminants present in water used to prepare dialysis fluid can be (i) particles, (ii) chemicals, and (iii) microbial contaminants such as bacteria, fungi and yeasts, and microbial derivatives or fragments (e.g., endotoxins released during active growth and lysis of micro-organisms). In additional to meeting purity and sterility requirements, peritoneal dialysate must also contain specific and precise amounts of solutes, such as sodium chloride, sodium bicarbonate, osmotic agents, buffers, and cation infusates.
Because traditional peritoneal dialysis systems require FDA-approved, pre-packaged dialysate, the dialysate can be expensive due to high manufacturing, shipping, and storage costs. Shortages can also occur. The problems are not mitigated by on-site dialysate preparation because the source water must still meet high fluid purity and sterility characteristics. Such standards may be difficult to meet, particularly for continuous, automatic peritoneal dialysis machines designed for home use. Further, traditional systems usually require storage of hundreds of liters of dialysate bags, including 300 L or more of peritoneal dialysate and over 300 kg of fluid per month. Storage and shipping of the peritoneal dialysate is expensive, labor intensive, and requires significant storage space.
Known systems and methods require significant space to store peritoneal dialysate prior to use. Continuous ambulatory peritoneal dialysis (CAPD) traditionally uses 1-4 exchanges of peritoneal dialysate a day, with an overnight dwell. Because each exchange requires approximately 2-4 L of peritoneal dialysate, use of prepackaged dialysate requires storing about 8-16 L of dialysate per day, or 56-112 L of dialysate per week. Automated peritoneal dialysis uses a cycler to cycle peritoneal dialysis into and out of the peritoneal cavity of the patient, generally at night. APD generally uses 3-5 exchanges daily, requiring up to 20 L of dialysate per day and up to 140 L of dialysate per week. Tidal Peritoneal Dialysis (TPD) is similar to APD with the exception that a between 250 mL to 1000 mL of the peritoneal dialysate is left in the peritoneal cavity of the patient between infusions. The known systems and methods require significant storage space and can deter the adoption of CAPD, APD, or TPD.
There is a need for systems and methods that can generate and use peritoneal dialysate using water of varying quality. There is also a need for a system that can generate peritoneal dialysate and use the peritoneal dialysate with an integrated cycler, reducing the number of components necessary for peritoneal dialysis. The need includes peritoneal dialysate having purity and sterility requirements such that patients will not contract an infection due to bacteria or other pathogens in fluid used for peritoneal dialysate. The need is acute for automated fluid generation for continuous dialysis machines for use at home where a water source can be tap water or other non-sterile source. There is also a need for systems and methods that allow for the automated generation of dialysate suitable for peritoneal dialysis that contains the proper amounts of solutes and cations. There is further a need for a system that uses filtration, as opposed to heat, in sterilization of the dialysate, which reduces the generation of glucose degradation products. There is also a need for a system that can generate peritoneal dialysate on demand, or for direct infusion into the patient, reducing the storage time and space requirements, as well as lowering the probability of loss of sterility of the dialysate.
The first aspect of the invention relates to a purity and control system for use in an peritoneal dialysis. In any embodiment, the purity and control system can comprise a first fluid line fluidly connected to a peritoneal dialysate generation system and a first ultrafilter; a second fluid line fluidly connecting the first ultrafilter to a second ultrafilter; the peritoneal dialysate generation system comprising at least a water source, an osmotic agent source, an ion concentrate source, and a water purification module fluidly connected to a peritoneal dialysate generation flow path.
In any embodiment, the second ultrafilter can be fluidly connected to a control valve; the control valve selectively directing fluid to either the peritoneal dialysate generation system or an integrated cycler.
In any embodiment, the control valve can be fluidly connected to the peritoneal dialysate generation system at an infusate line.
In any embodiment, the purity control system can comprise a pressure sensor in the first fluid line.
In any embodiment, the purity control system can comprise a pressure sensor in a third fluid line fluidly connecting the control valve and the integrated cycler.
In any embodiment, the first ultrafilter can be fluidly connected to a fourth fluid line; the fourth fluid line fluidly connected to a waste line.
In any embodiment, the waste line can be fluidly connectable to a waste reservoir.
In any embodiment, the waste line can be fluidly connectable to a drain.
In any embodiment, the second ultrafilter can be fluidly connected to a fifth fluid line; the fifth fluid line fluidly connected to the waste line.
In any embodiment, the fourth fluid line can have a valve positioned between the first ultrafilter and the waste line; and the fifth fluid line can have a valve positioned between the second ultrafilter and the waste line.
In any embodiment, the system can comprise a second valve positioned on a third fluid line fluidly connecting the second ultrafilter to the integrated cycler.
In any embodiment, the system can comprise a control system, the control system controlling a peritoneal dialysate flow rate based on data from the pressure sensor.
In any embodiment, the control system can control the peritoneal dialysate flow rate to maintain a pressure of the peritoneal dialysate between −200 mmHg to 500 mmHg, from −50 mmHg to 100 mmHg, from 0 mmHg to 100 mmHg, from −50 mmHg to 200 mm Hg, from 200 mmHg to 500 mmHg, or from 100 mmHg to 400 mmHg.
In any embodiment, the system can comprise a control system, the control system controlling a peritoneal dialysate flow rate based on data from the pressure sensor.
In any embodiment, the control system can control the peritoneal dialysate flow rate to maintain a pressure of the peritoneal dialysate between −200 mmHg to 500 mmHg, from −50 mmHg to 100 mmHg, from 0 mmHg to 100 mmHg, from −50 mmHg to 200 mm Hg, from 200 mmHg to 500 mmHg, or from 100 mmHg to 400 mmHg.
In any embodiment, the water purification module can comprise a sorbent cartridge.
The features disclosed as being part of the first aspect of the invention can be in the first aspect of the invention, either alone or in combination, or follow a preferred arrangement of one or more of the described elements.
The second aspect of the invention is directed to a method of delivering peritoneal dialysate to a patient comprising the steps of generating peritoneal dialysate with a peritoneal dialysate generation system; pumping the peritoneal dialysate through the purity control system of the first aspect of the invention; and pumping the peritoneal dialysate from the purity control system to the peritoneal dialysate cycler and into a peritoneal cavity of a patient.
In any embodiment, the method can comprise the step of measuring a pressure of the peritoneal dialysate upstream of the first ultrafilter, and adjusting a peritoneal dialysate flow rate through the purity control system based on the pressure of the peritoneal dialysate.
In any embodiment, the method can comprise the step of measuring a pressure of the peritoneal dialysate downstream of the second ultrafilter, and adjusting a peritoneal dialysate flow rate through the purity control system based on the pressure of the peritoneal dialysate.
In any embodiment, the method can comprise the step of generating an alert if the pressure of the peritoneal dialysate upstream of the first ultrafilter is outside of a predetermined range.
In any embodiment, the method can comprise the step of generating an alert if the pressure of the peritoneal dialysate downstream of the second ultrafilter is outside of a predetermined range.
The features disclosed as being part of the second aspect of the invention can be in the second aspect of the invention, either alone or in combination, or follow a preferred arrangement of one or more of the described elements.
Unless defined otherwise, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art.
The articles “a” and “an” are used to refer to one or to over one (i.e., to at least one) of the grammatical object of the article. For example, “an element” means one element or over one element.
The terms “adjusting” or to “adjust” refer to changing a parameter of a fluid, gas, or system.
The term “around,” when used in the context of parameter values or ranges, means approximately, or within a certain margin from, the described values or ranges and should be given the broadest interpretation as understood by those of skill in the art.
The term “comprising” includes, but is not limited to, whatever follows the word “comprising.” Use of the term indicates the listed elements are required or mandatory but that other elements are optional and may be present.
The term “consisting of” includes and is limited to whatever follows the phrase “consisting of.” The phrase indicates the limited elements are required or mandatory and that no other elements may be present.
The term “consisting essentially of” includes whatever follows the term “consisting essentially of” and additional elements, structures, acts or features that do not affect the basic operation of the apparatus, structure or method described.
The terms “control,” “controlling,” or “controls” refers to the ability of one component to direct the actions of a second component.
A “control system” can be a combination of components acting together to maintain a system to a desired set of performance specifications. The control system can use processors, memory and computer components configured to interoperate to maintain the desired performance specifications. The control system can also include fluid or gas control components, and solute control components as known within the art to maintain the performance specifications.
A “control valve” can be a valve that selectively controls movement of fluid, gas, or combinations therefore into one or more flow paths, sections, components or sections of a system.
The term “delivering peritoneal dialysate” or to “deliver peritoneal dialysate” refer to generating peritoneal dialysate and infusing the peritoneal dialysate. In one non-limiting example, the infusion can be provided to a patient.
The term “dialysate” can generally refer to any fluid used in dialysis from which solutes and particles can flow into or out of across a membrane to second fluid. For example, for peritoneal dialysis, solutes can be diffused through a peritoneal membrane of a patient. Dialysate can differ depending on the type of dialysis to be carried out. For example, dialysate for peritoneal dialysis may include different solutes or different concentrations of solutes than dialysate for hemodialysis.
The term “downstream” refers to a position of a first component in a flow path relative to a second component wherein fluid, gas, or combinations thereof, will pass by the second component prior to the first component during normal operation. The first component can be said to be “downstream” of the second component, while the second component is “upstream” of the first component.
A “drain” is a conduit for carrying waste fluids or gases.
The term “fluid” can be any substance without a fixed shape that yields easily to external pressure such as a gas or a liquid. Specifically, the fluid can be water containing any solutes at any concentration. The fluid can also be dialysate of any type including fresh, partially used, or spent.
The terms “fluid connection,” “fluidly connectable,” or “fluidly connected” refer to the ability to pass fluid, gas, or combinations thereof from one point to another point. The two points can be within or between any one or more of compartments, modules, systems, and components, all of any type.
A “fluid line” can refer to a tubing or conduit through which a fluid, gas, or fluid containing gas can pass. The fluid line can also contain air during different modes of operation such as cleaning or purging of a line.
To “generate an alert” or “generating an alert” refer to providing a user with an indication of a state of a system.
The terms to “generate peritoneal dialysate,” “generating peritoneal dialysate,” or “peritoneal dialysate generation” refers to creating a peritoneal dialysate solution from constituent parts.
The term “infusate line” refers to a fluid line for carrying peritoneal osmotic agents and/or cation infusates into a peritoneal dialysate generation flowpath.
An “integrated cycler” can refer a component for movement of fluid into and out of the peritoneal cavity of a patient, wherein the integrated cycler forms a part of an overall system. In one non-limiting example, the integrated cycler can be contained in a housing with other components used for peritoneal dialysis and be in fluid and electrical connection with desired components.
An “ion concentrate source” refers to a source of one or more ionic compounds. The ion concentrate source can be in water or solid form. The ion concentrate source can further have one or more ionic compounds that are at a higher ion concentration greater than generally used in dialysis.
The term “maintain a pressure” means to control one or more variables to prevent the pressure from exceeding or dropping below predetermined thresholds.
The term “measuring” or “to measure” can refer to determining any parameter or variable. The parameter or variable can relate to any state or value of a system, component, fluid, gas, or mixtures of one or more gases or fluids.
An “osmotic agent source” refers to a source of osmotic agents in solid and/or solution form. The osmotic agent source can interface with at least one other module found in systems for dialysis. The osmotic agent source can contain at least one fluid pathway and include components such as conduits, valves, filters or fluid connection ports, any of which are fluidly connectable to each other or to a fluid flow path. The osmotic agent source can either be formed as a stand-alone enclosure or a compartment integrally formed with an apparatus for dialysis for containing an osmotic agent source. If the osmotic agent(s) is in solid form, a system as described in the present invention can deliver a fluid, such as a highly purified or sterile water, to dilute the solid osmotic agent. Optional mechanical agitation or other means such as stirring can be used to help dissolve the solid osmotic agent.
The term “peritoneal cavity” refers to the space between the parietal peritoneum and visceral peritoneum of a patient.
“Peritoneal dialysate” is a dialysis solution to be used in peritoneal dialysis having specified parameters for purity and sterility. Peritoneal dialysate is not the same as dialysate used in hemodialysis although peritoneal dialysate may be used in hemodialysis.
The term “peritoneal dialysate flow rate” refers to a rate of a fluid moving through a specified section of a peritoneal dialysate generation system.
A “peritoneal dialysate generation flow path” can refer to a path used in generating dialysate suitable for peritoneal dialysis.
A “peritoneal dialysate generation system” refers to a collection of components used to generate peritoneal dialysate.
“Peritoneal dialysis” is a therapy wherein a dialysate is infused into the peritoneal cavity, which serves as a natural dialyzer. In general, waste components diffuse from a patient's bloodstream across a peritoneal membrane into the dialysis solution via a concentration gradient. In general, excess fluid in the form of plasma water flows from a patient's bloodstream across a peritoneal membrane into the dialysis solution via an osmotic gradient. Once the infused peritoneal dialysis solution has captured sufficient amounts of the waste components the fluid is removed. This cycle can be repeated for several cycles each day or as needed.
The term “predetermined range” is a range of possible values for a parameter to be set as.
The term “pressure sensor” refers to a device for measuring the pressure of a gas or liquid in a vessel, container, or fluid line.
The term “pump” refers to any device that causes the movement of fluids or gases by applying suction or pressure.
The terms “pumping” or to “pump” refer to moving a fluid or gas through a flow path with a pump.
The term “purity control system” refers to a set of components that can sterilize or purify a fluid or gas.
“Selectively directing fluid” or to “selectively direct fluid” means to cause a fluid, gas, or combinations thereof to move in a specified flow path.
The term “sorbent cartridge” refers to a cartridge containing one or more sorbent materials for removing specific solutes from solution. The term “sorbent cartridge” does not require the contents in the cartridge be sorbent based, and the contents of the sorbent cartridge can be any contents capable of removing solutes from a dialysate. The sorbent cartridge may include any suitable amount of one or more sorbent materials. In certain instances, the term “sorbent cartridge” refers to a cartridge which includes one or more sorbent materials besides one or more other materials capable of removing solutes from dialysate. “Sorbent cartridge” can include configurations where at least some materials in the cartridge do not act by mechanisms of adsorption or absorption.
An “ultrafilter” can refer to a semi permeable membrane through which a fluid can pass with removal of one or more solutes or particles from the fluid.
The term “upstream” refers to a position of a first component in a flow path relative to a second component, wherein fluid, gas, or a combination thereof, will pass by the first component prior to the second component during normal operation. The first component can be said to be “upstream” of the second component, while the second component is “downstream” of the first component.
A “valve” refers to a device capable of directing the flow of fluid or gas by opening, closing or obstructing one or more pathways to allow the fluid or gas to travel in a path. One or more valves configured to accomplish a desired flow can be configured into a “valve assembly.”
The term “waste line” refers to a fluid line through which waste fluids, gases, or spent dialysate can be pumped.
A “waste reservoir” can refer to a container for collecting and storing used or waste fluids.
The term “water purification module” refers to a component or collection of components capable of removing biological or chemical contaminants from water.
The term “water source” refers to a source from which water can be obtained. In one non-limiting embodiment, the obtained water is potable.
The invention relates to systems and methods for generating and using peritoneal dialysate in peritoneal dialysis. A system for generating peritoneal dialysate and delivering peritoneal dialysis therapy to a patient 134 can be configured as illustrated in
The water source can be a source of potable water including a purified water source. Purified water can refer to any source of water treated to remove at least some biological or chemical contaminants. The water tank 102 can alternatively be a non-purified water source, such as tap water, wherein the water from the water tank 102 can be purified by the system as described. A non-purified water source can provide water that has undergone no additional purification, water that has undergone some level of purification, but does not meet the definition of “purified water” provided, such as bottled water or filtered water. The peritoneal dialysate generation flow path 101 can also have a direct connection 112 to a purified or non-purified water source, shown as direct connection 112. The water source can be any source of water, whether from a tap, faucet, or a separate container or reservoir.
The water purification module 103 can be a sorbent cartridge. The sorbent cartridge can include aluminum oxide for removal of fluoride and heavy metals. The sorbent cartridge can have a first layer of aluminum oxide, a second layer of activated carbon and a third layer of an ion exchange resin. The sorbent cartridge can be sized depending on the needs of the user, with a larger sized sorbent cartridge allowing for more exchanges before the sorbent cartridge must be replaced. The sorbent cartridge can also include activated carbon. The activated carbon operates to adsorb non-ionic molecules, organic molecules, and chlorine from the water, along with some endotoxins or bacterial contaminants. In certain embodiments, the sorbent cartridge can include activated carbon, activated alumina, and potentially other components that work primarily by physical and chemical adsorption, combined with one or more ion exchange materials. The ion exchange materials can be any known material in the art, but preferably the ion exchange materials will release hydrogen and hydroxyl ions in exchange for other cations and anions in solution, resulting in water formation by the exchange process.
The sorbent cartridge can additionally include a microbial filter and/or a particulate filter. A microbial filter can further reduce the amount of bacterial contaminants present in the fluid from the water tank 102 or direct connection 112. Optionally, an ultrafilter can be included to remove endotoxins from the fluid. A particulate filter can remove particulate matter from the fluid. The water tank 102 can be any size usable with the system, including between around 12 and around 25 L. A water tank 102 of 20 L can generally generate the necessary peritoneal dialysate for multiple cycles. In certain embodiments, the water purification module 103 can include an optional UV light source for further purification and sterilization of the water prior to adding osmotic agents or ion concentrates.
Alternatively, the water purification module 103 can be any component capable of removing contaminants from the water in the water source, including any one or more of a sorbent cartridge, reverse osmosis module, nanofilter, combination of cation and anion exchange materials, activated carbon, activated alumina, silica, or silica based columns.
After the fluid passes through the water purification module 103, the fluid is pumped to a concentrate source 104, where necessary components for carrying out peritoneal dialysis can be added from the concentrate source 104. The concentrates in the concentrate source 104 are utilized to create a peritoneal dialysis fluid that matches a dialysis prescription. Concentrate pump 105 and concentrate valve 111 can control the movement of concentrates from the concentrate source 104 to the peritoneal dialysate generation flow path 101 in a controlled addition. Concentrate valve 111 can be replaced with a hose T. A hose T is a fluid connector in a T-shape, with a port at each end for fluid to enter or exit the hose T. The concentrates added from the concentrate source 104 to the peritoneal dialysate generation flow path 101 can include any component prescribed for use in peritoneal dialysate. Table 1 provides non-limiting exemplary ranges of commonly used components of peritoneal dialysate.
To reduce the glucose degradation products (GDP) formed, some peritoneal dialysate systems use a low GDP formulation. Exemplary peritoneal dialysate concentrations for low GDP formulations are provided in Table 2. Generally, the low GDP peritoneal dialysate is provided in two separate bags, with one bag containing calcium chloride, magnesium chloride and glucose maintained at low pH, and the second bag containing sodium chloride and the buffer components, including sodium lactate and sodium bicarbonate. The two bags are mixed prior to use to generate a peritoneal dialysate with a neutral pH. Alternatively, a two chamber bag can be used to prevent mixing of fluids prior to use wherein, the chambers, can for example, be separated by a wall of a divider of any type.
One of skill in the art will understand that other components can be used in place of the components listed in Tables 1-2. For example, dextrose as listed in Table 1 is commonly used as an osmotic agent. However, other osmotic agents can be used in addition to, or in place of, the dextrose, including glucose, icodextrin or amino acids, including dialysate with multiple osmotic agents. Although the sources of sodium, calcium, and magnesium listed in Table 1 are chloride salts, other sodium, magnesium, and calcium salts can be used, such as lactate or acetate salts. Peritoneal dialysate may also contain buffers for maintaining pH of the peritoneal dialysate, including bicarbonate buffer, acetate buffer, or lactate buffer. Although not generally used in peritoneal dialysis, potassium chloride can be used for hypokalemic patients who don't receive sufficient potassium through diet. The concentrate source 104 can contain one or more osmotic agents, as well as one or more ion concentrates, such as concentrated sodium chloride, sodium lactate, magnesium chloride, calcium chloride, and/or sodium bicarbonate. The concentrate source 104 can be a single source of concentrates, including both osmotic agents and ion concentrates, or can include multiple sources of concentrates, with separate sources for the osmotic agents and ion concentrates. The system can have a single concentrate that has all components mixed for a daytime or overnight treatment for use in a home by a single patient. Alternatively, the concentrate source 104 can include separate sources for any solutes to be used in the peritoneal dialysate each with a separate concentrate pump to add each solute. Concentrate pump 105 pumps concentrated solutions from the concentrate source or sources 104 to the peritoneal dialysate generation flow path 101 in a controlled addition. Where more than one concentrate source is used, separate concentrate pumps can move each of the concentrates into the peritoneal dialysate generation flow path 101, or a single concentrate pump can be used, with valves configured allow individual control over the movement of each of the concentrate solutions to the peritoneal dialysate generation flow path 101.
After addition of solutes from the concentrate source 104, the fluid in the peritoneal dialysate generation flow path 101 can contain all the necessary solutes for peritoneal dialysis. The peritoneal dialysate should reach a level of sterility for peritoneal dialysis. The level of sterility can be any level that meets an applicable regulatory requirement, such as a sterility assurance level of 10−6 required by the FDA, meaning that the chance a viable organism is present after sterilization is 1 in 1,000,000. The system can pump the fluid to a sterilization module for sterilization of the peritoneal dialysate. As shown in
The generated peritoneal dialysate can be pumped directly to an integrated cycler 110 for immediate infusion into a patient 134. Alternatively, the dialysate can be pumped to an optional dialysate container 114 as a pre-prepared bolus of solution for storage until ready for use by a patient 134. Valve 116 can control the movement of fluid to either the integrated cycler 110 or the dialysate container 114. Stored dialysate in dialysate container 114 can be pumped as needed to the integrated cycler 110 by pump 115 through valve 117. The dialysate container 114 can include one or more sterilized dialysate bags. The dialysate bags, once filled with peritoneal dialysate, can be stored until needed by the patient 134. The dialysate container 114 can alternatively be a reusable sterilized container or bag. The reusable container or bag can be cleaned and sterilized daily, or at set time periods. Alternatively, the dialysate container 114 can be any type of storage container, such as a stainless-steel container. The dialysate container 114 can store enough peritoneal dialysate for a single infusion cycle of peritoneal dialysate into the patient 134, or enough peritoneal dialysate for multiple infusions into a patient 134. Additional or alternative storage containers can be included at other locations in the peritoneal dialysate generation flow path 101. A storage container can be included upstream of the sterilization module, and downstream of the water purification module 103. Before the fluid is utilized in the cycler stage, the fluid can be pumped through the sterilization module to ensure sterility of stored fluid. Further, concentrates can be added to fluid before storing the fluid, or after storage of the fluid but prior to sterilization in the sterilization module.
The storage containers can be either upstream or downstream of the concentrate source 104. The addition of concentrates to the fluid can happen either before storage of the fluid, or after storage of the fluid just before sterilization in the sterilization module.
By generating and immediately using the peritoneal dialysate, the dialysate storage time can be reduced, reducing the possibility of bacterial growth. A user interface can be included on the peritoneal dialysis generation machine in communication with the control system, allowing a patient 134 to direct the generation of peritoneal dialysate at a selected time as needed. Additionally, or alternatively, the peritoneal dialysate machine can include a timer, and the timer can cause the peritoneal dialysate machine to generate peritoneal dialysate at predetermined times according to the patient's 134 peritoneal dialysis schedule. Alternatively, the peritoneal dialysate generation machine can be equipped with wireless communication, such as Wi-Fi, Bluetooth, Ethernet, or any other wireless communication system known in the art. The user can direct the peritoneal dialysis machine to generate peritoneal dialysate at a specified time from any location. By using a timer, user interface, or wireless communication to control the generation of peritoneal dialysate on demand, the peritoneal dialysate storage time can be reduced, lowering the chances of generating significant amounts of degradation products or allowing bacterial growth.
The peritoneal dialysate can be generated and used in real time, with direct infusion of the peritoneal dialysate into the patient 134 through the integrated cycler 110. For real time generation and use of the peritoneal dialysate, the flow rate of fluid through the peritoneal dialysate generation flow path 101 can be between 50 and 300 ml/min. With the online generation of fluid described, a flow rate of 300 ml/min can support an exchange time of between 10 and 15 minutes for a full cycle of draining and filling the peritoneal cavity of a patient 134. If a dialysate container 114 is used to store generated peritoneal dialysate, the flow rate of fluid through the peritoneal dialysate generation flow path 101 can be any flow rate capable of producing the necessary peritoneal dialysate. In certain embodiments, the flow rate can be at least around 15 mL/min, which can produce around 20 L of peritoneal dialysate in 24 hrs. The integrated cycler 110 can then infuse the generated peritoneal dialysate into the peritoneal cavity of a patient 134. The integrated cycler 110 and the rest of the system can communicate for the purposes of generation and use of the peritoneal dialysate by any method known in the art, including Bluetooth, Wi-Fi, Ethernet, or direct hardware connections to meet patient or clinic needs. Additional valves and regulators (not shown in
In certain embodiments, the dialysate container 114 can store enough peritoneal dialysate for multiple infusions into the patient 134, including enough peritoneal dialysate for one day or more of treatment. A timer can be included in the control system and can cause the machine to generate fresh peritoneal dialysate each day or at set times.
The integrated cycler 110 can include a metering pump 119 for metering peritoneal dialysate into the peritoneal cavity of the patient 134. An in-line heater 118 heats the peritoneal dialysate to a desired temperature prior to infusion into the patient 134. A pressure regulator 120 ensures the peritoneal dialysate pressure is within a predetermined range safe and comfortable for infusion into the patient 134. The metering pump 119 can use any safe pressure for infusing fluid into the patient 134. Generally, the pump pressures are on average set at ±10.3 kPa or 77.6 mmHg. If there is no fluid flow, the maximum pressure can increase to ±15.2 kPa or 113.8 mmHg for a short period, such as less than 10 seconds. The peritoneal dialysate is infused into the peritoneal cavity of the patient 134 through infusion line 124. An additional microbial filter (not shown) may be used to sterilize the peritoneal dialysis fluid immediately before the peritoneal dialysate enters the patient 134. After a dwell period, the peritoneal dialysate is drained from the patient 134 through drain line 123. Pump 122 provides a driving force for removing the peritoneal dialysate from the patient 134. Treatment, other than the first full cycle for a patient in APD, generally begins with drainage of the peritoneal cavity of the patient 134, prior to infusing the fresh peritoneal dialysate into the patient 134. An optional waste reservoir 121 can be included to store the used peritoneal dialysate for disposal. Alternatively, the drain line 123 can be directly connected to a drain for direct disposal. A standard waste reservoir 121 is 15 L, however, the waste reservoir 121 can be any size, including between 12 and 20 L. For patients requiring a higher drainage, a drain manifold can be included for connecting multiple waste reservoirs. There is no set rate for draining of peritoneal dialysate from the peritoneal cavity of the patient 134, and any flow rate can be used with the integrated cycler 110.
Various sensors positioned in the peritoneal dialysate generation and infusion system ensure that the generated fluid is within predetermined parameters. Flow meter 135 ensures the incoming water is at a correct flow rate, while pressure sensor 136 ensures the incoming water is at an appropriate pressure. Conductivity sensor 125 is used to ensure that the water exiting water purification module 103 has been purified to a level safe for use in peritoneal dialysis. Conductivity sensor 126 ensures the conductivity of the dialysate after the addition of concentrates from concentrate source 104 is within a predetermined range. Refractive index sensor 127 ensures that the concentration of the osmotic agents is within a predetermined range. pH sensor 128 ensures the pH of the peritoneal dialysate is within a predetermined range. After passing through the sterilization module including second ultrafilter 109, pH sensor 129 and conductivity sensor 130 are used to ensure that no changes in the pH or conductivity have occurred during purification or storage of the dialysate in dialysate container 114. The integrated cycler 110 has flow meter 131, pressure sensor 132 and temperature sensor 133 to ensure that the dialysate being infused into the patient 134 is within a proper flow rate, pressure, and temperature range. The flow meter 131 can also calculate the volume of solution infused into the patient 134. The pressure sensor 132 can monitor the pressure in the peritoneal cavity.
Overfill, or excessive solution in the peritoneal cavity beyond the target volume may present complications in therapy. Overfill can be caused by many factors, including failing to fully drain the peritoneal cavity prior to infusion of fresh peritoneal dialysate. In any embodiment, the integrated cycler 110 can start therapy with a drain step to ensure that no peritoneal dialysate remains in the peritoneal cavity. Monitoring both pressure and volume of peritoneal dialysate introduced to the patient 134 can avoid overfill. If the pressure rises to a certain point, the system can be programmed to end filling or send an alert to a user to complete filling of the peritoneal cavity at a desired level. The volume of peritoneal dialysate extracted from and introduced to the patient 134 can also be monitored with flow meters to ensure proper volumes of exchanges. Draining the peritoneal cavity can be performed in a similar manner by monitoring the pressure and volume of the drained peritoneal dialysate.
As illustrated in
Table 3 provides exemplary non-limiting ranges of solutes that can be added from a single concentrate source 104 to the peritoneal dialysate generation flow path 101, including the starting concentration of the solutes in the concentrate source, as well as exemplary final volumes of the solutes in the dialysate and the exemplary flow rates of both the solutes and the water in the peritoneal dialysate generation flow path 101 that will achieve those concentrations. The solutes shown in Table 3 are traditional peritoneal dialysate solutes. Table 4 shows exemplary ranges of solutes that can be used as a low GDP formulation. Table 5 shows exemplary ranges of solutes that can be used with icodextrin as the osmotic agent. Icodextrin is sometimes used as an osmotic agent for a long dwell period. If dextrose or glucose is used in a long dwell period, reabsorption of the ultrafiltrate can occur, reducing the net volume of fluid removed. Icodextrin can result in a long sustained ultrafiltration, and can provide improved ultrafiltration efficiency over a long dwell period. One of skill in the art will understand that the concentrations of any of the solutes shown in Tables 3-5 can be altered by altering the flow rates of the system pump 108 or concentrate pump 105. However, the ratio of the solutes included is fixed if using a single concentrate source 104. If the ratio of the solutes needs to be altered for any reason, a new concentrate solution may be needed.
Although using a single concentrate source 104 in the system requires a fixed ratio of solutes in the generated peritoneal dialysate, a single concentrate source 104 provides certain advantages. Storage requirements are decreased, as only a single concentrate solution needs to be stored for a given dialysate prescription. There is also a lower risk of patient error in adding solutes to the dialysate in the proper amounts. A single concentrate source 104 also requires less supplies, less pumps, and less hardware. Further, because fewer containers are needed, the containers are easier to manage, clean, and disinfect. A higher concentration of solutes in the concentrate source 104 will allow minimization of the container size and maximization of the source water used in PD solution preparation, lowering costs. The limiting factor is mutual solubility of the components, which is generally limited by glucose or icodextrin solubility. The flow rate for the source water can be optimized to adjust the time required to prepare the solution. In the case of on-demand dialysate preparation, a high flow rate is desired to minimize the time needed to prepare the solution. The flow rate limit will be controlled by the metering accuracy of the concentrate pump 105 at the rate required to match the water feed. With a single concentrate source 104, about 150 ml/exchange can be needed, which corresponds to about 600 ml/day or 4.2 L/week. The concentrate source 104 can be sized depending on the needs of the user, with a larger concentrate source requiring less frequent refilling.
The system can also include an additional waste reservoir (not shown in
The peritoneal dialysate generation flow path 101 and integrated cycler 110 can be disinfected with a disinfection solution through on-board disinfection if the components of the peritoneal dialysate generation flow path 101 and integrated cycler 110 are to be reused. Disinfection may not be required with a fully disposable peritoneal dialysate generation flow path 101. The peritoneal dialysate generation flow path 101 and integrated cycler 110 can be configured to form a loop by connecting the portion of the peritoneal dialysate generation flow path 101 that connects to water tank 102 or the direct connection 112 to a water source to the infusion line 124. The disinfection solution can be introduced into the peritoneal dialysate generation flow path 101 and recirculated through the fluid lines by system pumps 108 and 119. Alternatively, the peritoneal dialysate generation flow path 101 and integrated cycler 110 can be disinfected separately after disconnection of the integrated cycler 110 from the peritoneal dialysate generation flow path 101. The disinfection solution can be a citric acid solution, a peracetic acid solution, a bleach solution, or any other disinfection solution known in the art. Disinfectant can be circulated through the flow loop and heated. The disinfectant can be heated to any temperature capable of disinfecting the system, including temperatures of at least 80° C. or greater. The disinfectant can be introduced to the flow loop and recirculated at elevated temperatures to ensure complete disinfection.
Solutes can be added to the peritoneal dialysate generation flow path 201 from two or more separate concentrate sources, as shown in
As illustrated in
Although shown as a refractive index meter 222 in
Although each concentrate source is illustrated in
The concentrate sources 202-206 can be single use concentrate sources or disposable concentrate sources. The disposable concentrate sources are used in a single peritoneal dialysate generation process and then disposed. Multiple use concentrate sources are used repeatedly, and refilled as necessary with the solute.
Table 6 provides exemplary, non-limiting, ranges of solutes that can be added to the peritoneal dialysate using a separate osmotic agent source, glucose in Table 6, and a separate ion concentrate source containing sodium chloride, sodium lactate, magnesium chloride, calcium chloride and sodium bicarbonate. Because the glucose is added separately from the ion concentrates, the ratio of glucose to the other solutes can be varied depending on the needs of the patient.
By using multiple concentrate sources, greater individualization and therapy customization can be achieved for each patient. With a single concentrate source, all solutes in the generated peritoneal dialysate must be present in a fixed ratio. By using more than one concentrate source, the ratio of solutes used in the peritoneal dialysate can be altered as the concentration of each of the osmotic agent and ion solutes can be individually controlled. For example, as illustrated by Table 6, with a single ion concentrate source and a single osmotic agent source, peritoneal dialysate with greater or less osmotic agent per concentration of ions can be generated, providing the ability to adjust the tonicity of the peritoneal dialysate solution independently of the electrolyte composition to meet the UF needs of any patient with a single set of solutions and allowing greater control over ultrafiltration. The ultrafiltration rate that results from using the peritoneal dialysate solutions can be altered by altering the concentration of the osmotic agent independently of the ionic solutes, or by changing the osmotic agent used. Because the system is not limited to discrete glucose or other osmotic agent concentrations like known commercial solutions; the system can customize the peritoneal dialysate solutions to meet the ultrafiltration needs of patient as determined by a healthcare provider. As illustrated in Table 6, the glucose level in the peritoneal dialysate solution can be varied from 0.55 g/dL to 4.5 g/dL, while maintaining the electrolytes and buffer components constant, allowing the system to cover the range of glucose formulations currently offered commercially using a single Part A and Part B composition.
In certain embodiments, two osmotic agent sources can be used, such as a dextrose source and an icodextrin source. With two osmotic agent sources, one could use dextrose during the daytime exchanges for CAPD and icodextrin during the night dwell to take advantage of the higher UF removal from icodextrin. Conversely, dextrose could be used during the night dwell and icodextrin for the extended daytime dwell in APD systems.
By using separate concentrate sources for each solute, complete individualization of the concentrations and ratios of solutes in the peritoneal dialysate can be achieved. Table 7 provides exemplary ranges of solutes that can be used in peritoneal dialysate as made by a system with each solute in a separate concentrate source. An advantage of using separate concentrate sources for each solute is that virtually any peritoneal dialysate solution composition can be prepared from a single set of component formulations. A system with separate concentrate sources for each solute is useful for patients whose prescriptions change periodically due to diet or other factors. Such patients would need to store multiple formulations if using only one or two concentrate sources, and the risk of errors would be increased.
The one or more concentrate sources can be detachable from the rest of the system for sterilization. The concentrate sources can also be sterilized each time the concentrate sources are filled with new concentrate solutions. Further, the concentrate sources can be sterilized after a set number of uses, or after a set period of time. Moreover, the concentrate sources and the remaining components including the fluid lines of the peritoneal dialysate generation system can be sterilized without any of the components by passing a disinfection solution, such as a citric acid, peracetic acid, or bleach solution, through all of the lines and containers of the system.
As described, the peritoneal dialysate is sterilized by pumping the peritoneal dialysate through a sterilization module, which can include first ultrafilter 518, and optionally a second ultrafilter 520 and/or an optional UV light source (not shown). Pressure sensor 517 measures the fluid pressure prior to the fluid entering the sterilization module, shown as ultrafilters 518 and 520, and is used in the control circuit to control the pressure. The fluid passes through first ultrafilter 518, through valve 519, and then through second ultrafilter 520. Connector 523, three way valve 521, and valve 519 allow backflushing and disinfection of the ultrafilters 518 and 520. The fluid is then pumped into the integrated cycler 539 for use in peritoneal dialysis. As described, the system can include a dialysate container (not shown) for storage of the generated peritoneal dialysate until used by the patient 538 at any location, including upstream or downstream of the sterilization module.
The integrated cycler 539 includes an infusion line 531 and a drain line 533. Bubble trap 526 traps air bubbles present in the heated dialysate. The air is vented from the system through bubble trap valve 527. Pressure sensor 529 ensures the pressure of the fluid is within a predetermined range. The infusion line 531 is connected to a three-way valve 530, which controls fluid movement between the infusion line 531, the patient 538, and the drain line 533. The three way valve 530 is connected through connector 532 to a catheter inserted into the peritoneal cavity of the patient 538. A filter 522 can be included between the three-way valve 530 and the catheter for additional cleaning of the peritoneal dialysate prior to entering a patient 538. In any embodiment, the filter 522 can be a disposable filter. The peritoneal dialysate is infused into the patient 538 and held for a dwell period. After the dwell period, the fluid is pumped out of the peritoneal cavity of the patient 538 by drain pump 536. The three-way valve 530 is switched to direct fluid into the drain line 533. Pressure sensor 534 measures the pressure of fluid in the drain line 531 to ensure proper drainage. Flow meter 535 measures the flow rate and volume of fluid removed from the patient 538. The drain line 531 is connected to a drain or waste reservoir 537 through connector 540 for collection and disposal of the used peritoneal dialysate.
For automated disinfection of the system, connector 540 can be connected to connector 523 to form a flow loop. Disinfectant can be circulated through the flow loop and heated. The disinfectant can be heated to any temperature capable of disinfecting the system, including temperatures of at least around equal to 80° C. or greater (≧80) when using citric acid as a disinfectant. Peracetic acid or bleach can be used to disinfect the system at room temperature. The disinfectant can be introduced to the flow loop and recirculated at elevated temperatures to ensure complete disinfection. The disinfectant used can be any suitable disinfectant known in the art, including peracetic acid, citric acid, or bleach. The connectors and components of the system can be gamma and autoclave compatible to resist the high temperatures used during disinfection. The system can be primed by introducing a priming fluid to the peritoneal dialysate generation flow path 501 and integrated cycler 539.
After the fluid passes through the water purification module 603, the fluid is pumped to a concentrate source 604, where necessary components for carrying out peritoneal dialysis can be added from the concentrate source 604. The concentrates in the concentrate source 604 are utilized to create a peritoneal dialysis fluid that matches a dialysis prescription. Concentrate pump 605 and concentrate valve 611 can control the movement of concentrates from the concentrate source 604 to the peritoneal dialysate generation flow path 601 in a controlled addition. Alternatively, concentrate valve 611 can be a hose T or backflow restricting hose T. The concentrates added from the concentrate source 604 to the peritoneal dialysate generation flow path 601 can include components required for use in peritoneal dialysate. Upon addition of solutes from the concentrate source 604, the fluid in the peritoneal dialysate generation flow path 601 can contain all the necessary solutes for peritoneal dialysis. The peritoneal dialysate should reach a level of sterility for peritoneal dialysis, as described. As shown in
The generated peritoneal dialysate can be pumped directly to an integrated cycler 610 for immediate infusion into a patient 634. Alternatively, the dialysate can be pumped to an optional dialysate container 614 as a pre-prepared bolus of solution for storage until ready for use by a patient 634. Valve 616 can control the movement of fluid to either the dialysate container 614. Stored dialysate in dialysate container 614 can be pumped as needed to back into the peritoneal dialysate generation flow path 601 by pump 615 through valve 617. The dialysate container 614 can store enough peritoneal dialysate for a single infusion of peritoneal dialysate into the patient 634, or enough peritoneal dialysate for multiple or continuous infusions into one or multiple patients.
The generated peritoneal dialysate can be pumped to valve 637. Valve 637 can control movement of the peritoneal dialysate to any of three options. First, the peritoneal dialysate can be pumped to integrated cycler 610, second diverted for use with a non-integrated external cycler 639, or third diverted to a dialysate container 640. All three options can be performed contemporaneously or selectively. If diverted to the non-integrated external cycler 639, the peritoneal dialysate can be pumped via valve 638. Valve 638 can control the movement of the peritoneal dialysate through either a direct connection to an external cycler 639 or to a dialysate container 640. Alternative valve and pump configurations for performing the same functions are contemplated by the present invention. For example, the direct connection to an external cycler 639 can use any type of connector known in the art. The connectors can be single-use or reusable connectors and should provide for sterile transfer of fluids. The connectors should preferably be closed connectors, to avoid contact between the fluids and the external environment. A non-limiting example of a connector that can be used for a direct connection to an external cycler is the INTACT® connectors provided by Medinstill Development LLC, Delaware, US. The dialysate container 640 can be heated with an optional heater 641 and then used in peritoneal dialysis. The connectors to the dialysate container 640 can be any type of connector known in the art. The connectors can be single use or disposable connectors that provide transfer of sterile fluids. A non-limiting example of connectors that can be used with the described system is the Lynx®-Millipore connectors available from Merck KGaA, Darmstadt, Germany.
The integrated cycler 610 can include a metering pump 619 for metering peritoneal dialysate into the peritoneal cavity of the patient 634. A heater 618 heats the peritoneal dialysate to a desired temperature prior to infusion into the patient 634. A pressure regulator 620 ensures the peritoneal dialysate pressure is within a predetermined range safe for infusion into the patient 634. The metering pump 619 can use any safe pressure for infusing fluid into the patient 634. Generally, the pump pressures are on average set at ±10.3 kPa or 77.6 mmHg. If there is no fluid flow, the maximum pressure can increase to ±15.2 kPa or 113.8 mmHg for a short period, such as less than 10 seconds. The peritoneal dialysate is infused into the peritoneal cavity of the patient 634 through infusion line 624. After a dwell period, the peritoneal dialysate is drained from the patient 634 through drain line 623. Pump 622 provides a driving force for removing the peritoneal dialysate from the patient 634. An optional waste reservoir 621 can be included to store the used peritoneal dialysate for disposal. Alternatively, the drain line 623 can be directly connected to a drain for direct disposal. The waste reservoir 621 can be any size, including between around 12 and around 20 L. For patients requiring a higher drainage, a drain manifold can be included for connecting multiple waste reservoirs.
Various sensors positioned in the peritoneal dialysate generation and infusion system ensure that the generated fluid is within predetermined parameters. Flow meter 635 ensures the incoming water is at a correct flow rate, while pressure sensor 636 ensures the incoming water is at an appropriate pressure. Conductivity sensor 625 is used to ensure that the water exiting water purification module 603 has been purified to a level safe for use in peritoneal dialysis. Conductivity sensor 626 ensures the conductivity of the dialysate after the addition of concentrates from concentrate source 604 is within a predetermined range. Refractive index sensor 627 insures that the concentration of the osmotic agents is within a predetermined range. pH sensor 628 ensures the pH of the peritoneal dialysate is within a predetermined range. After passing through the sterilization module including second ultrafilter 609, pH sensor 629 and conductivity sensor 630 are used to ensure that no changes in the pH or conductivity have occurred during purification or storage of the dialysate in dialysate container 614. The integrated cycler 610 has flow meter 631, pressure sensor 632 and temperature sensor 633 to ensure that the dialysate being infused into the patient 634 is within a proper flow rate, pressure, and temperature range.
A fluid line 805 can connect a water source 804 to the peritoneal dialysate generation cabinet 801. The fluid line 805 can enter through a connector 828 in a top 806 of the water source 804. The fluid line 805 connects to the peritoneal dialysate generation flow path as described with reference to
As described, the peritoneal dialysate generation flow path can include various sensors for detection of conductivity, pH, refractive index, or other dialysate parameters. The sensors can be included either inside or outside of the body of the peritoneal dialysate generation cabinet 801. The fluid lines and valves connecting the components of the peritoneal dialysate generation flow path can likewise be positioned inside of the cabinet body. As described, a top of the peritoneal dialysate generation cabinet 801 can have a graphical user interface 802 including screen 803. Messages from the control system to the user, or from the user to the control system, can be generated and read through the graphical user interface 802. The user can direct the generation of peritoneal dialysate through the graphical user interface 802, and can receive messages from the system through screen 803. The system can generate alerts to the user, including any problems detected by any of the sensors, as well as the progress of peritoneal dialysate generation. A handle 824 can be included for opening the peritoneal dialysate generation cabinet 801 to allow access to components on the inside of the cabinet. Handles 821 and 823 can be included to hold the fluid lines and power cord when not in use.
Disinfection connector 822 illustrated in
As described, a top of the peritoneal dialysate generation cabinet 901 can have a graphical user interface 902 including screen 903. Messages from the control system to the user, or from the user to the control system, can be generated and read through the graphical user interface 902. The user can direct the generation of peritoneal dialysate through the graphical user interface 902, and can receive messages from the system through screen 903. The system can generate alerts to the user, including any problems detected by any of the sensors, as well as the progress of peritoneal dialysate generation. A handle 920 can be included for opening the peritoneal dialysate generation cabinet 901 to allow access to components on the inside of the cabinet. Handles 921 and 923 can be included to hold the fluid lines and power cord when not in use.
Disinfection connector 922 can be included for disinfection of the waste line 908. During disinfection, the waste line 908 can be disconnected from the drain 909 and connected to disinfection connector 922. Disinfectant solution from a disinfectant source (not shown in
A first conductivity sensor 1107 can measure the conductivity of the fluid exiting sorbent cartridge 1105. One or more infusates can be added from ion concentrate source 1109 through connector 1162 to infusate line 1110 by infusate pump 1112 to the peritoneal dialysate generation flow path 1111 at T-junction 1150. Filter 1151 can remove any particulate matter from the infusate concentrate prior to reaching the peritoneal dialysate generation flow path 1111. Alternatively, a valve can be used in place of T-junction 1150. A second conductivity sensor 1108 can measure the conductivity of the fluid after addition of the infusates to ensure proper concentrations of each infusate. As described, the system can include any number of infusate sources, each with the same or separate infusate pumps and infusate lines.
An osmotic agent pump 1115 can add an osmotic agent to the peritoneal dialysate generation flow path 1111 through infusate line 1117 at T-junction 1156. A filter 1152 can remove any particulate matter from the osmotic agent concentrate. As illustrated in
Heater 1120 heats the fluid in the peritoneal dialysate generation flow path 1111 to the patient body temperature. Temperature sensor 1121 measures the temperature of the fluid and can be used to by a control system to control the heater 1120, heating the fluid to a temperature of between around 20° C. to around 41° C. In a preferred embodiment, the desired temperature can be 37±2° C. or between 36.5° C. to 37.25° C. A control system can monitor the temperature and shut off flow or generate an alarm if the temperature is outside of the desired range. In certain embodiments, the control system can shut off flow if the temperature is equal to greater than around 41° C. Pressure sensor 1122 measures the pressure of the fluid prior to entering a dialysate sterilization module.
The dialysate sterilization module can include a first ultrafilter 1123 and a second ultrafilter 1124 fluidly connected by fluid line 1159. The fluid flows through both ultrafilters to remove any chemical or biological contaminants. Waste fluid can exit the first ultrafilter 1123 through fluid line 1130 and exit the second ultrafilter 1124 through fluid line 1129. Valves 1149 and 1128 control the movement of fluid between the first ultrafilter 1123 and second ultrafilter 1124 into waste line 1131, which is fluidly connected to fluid line 1130 at T-junction 1167. Valves 1149 and 1128 can be used to modulate the fluid movement out of ultrafilters 1123 and 1124 to ensure sufficient pressure for ultrafiltration. If the pressure in ultrafilter 1124 decreases below a necessary value, valve 1128 can be closed, preventing fluid movement from ultrafilter 1123 into fluid line 1130 and increasing the pressure in ultrafilter 1124. The waste line 1131 is fluidly connected to a waste line 1134 at T-junction 1168 and to waste reservoir 1133 through connector 1169, or alternatively, to a drain. Although shown with a screw top 1170 and tap 1171, one of skill in the art will understand that alternative methods for filling and draining waste reservoir 1133 can be used.
Fluid exiting the second ultrafilter 1124 passes through optional control valve 1125. Control valve 1125 can selectively direct fluid into either fluid line 1113 and an integrated cycler or into fluid line 1126 for addition to the dextrose source 1148 and icodextrin source 1114 via T-junction 1155. The fluid can be added to dextrose source 1148 and icodextrin source 1114 to dissolve solid icodextrin and solid dextrose prior to generating the peritoneal dialysate.
Fluid line 1113 can include a pressure sensor 1127 to ensure that the fluid pressure is within predetermined limits prior to entering the integrated cycler. Valve 1135 controls the movement of fluid from the sterilization module. Valve 1136 controls the movement of fluid into and out of the integrated cycler through cycler line 1138.
The cycler line 1138 can include a second temperature sensor 1139 to ensure the proper temperature of the peritoneal dialysate prior to infusion into the patient 1147. An air detector 1141 is included to detect any air that would otherwise be introduced into the patient 1147. A bubble trap (not shown) can be included to remove any detected air. A flow sensor 1143 measures the flow rate of fluid in the cycler line 1138 and can be used to control the amount of peritoneal dialysate infused into the patient 1147. A pressure sensor 1142 can be included to ensure the fluid pressure in cycler line 1138 is within predetermined limits for infusion into the patient 1147. A catheter 1140 can connect to the cycler line 1138 at connection 1144. In certain embodiments, a heparin syringe 1146 can be included to add heparin or other medication to the peritoneal dialysate. Filter 1145 removes any particulate matter prior to infusion into the patient 1147.
After a dwell period, the spent peritoneal dialysate can be drained from the patient 1147 through the cycler line 1138. Drain pump 1132 can provide the driving force for draining the spent peritoneal dialysate. The spent peritoneal dialysate passes through valves 1136 and 1137 and into drain line 1134, which can fluidly connect to waste reservoir 1133 or to a drain.
As illustrated in
The purity control system can also include a pressure sensor 1122 in the fluid line fluidly connecting the first ultrafilter 1123 to the peritoneal dialysate generation flow path 1111. Proper use of the ultrafilters can require a specific pressure range for the fluid flowing through the purity control system. Pressure sensor 1122 can be in communication with a control system that can stop or change the rate of the system pump 1103 to adjust a peritoneal dialysate flow rate if the pressure is outside of the predetermined range. In certain embodiments, the control system can adjust the peritoneal dialysate flow rate to maintain a pressure of between . . .
Pressure sensor 1127 measures the pressure of the fluid exiting second ultrafilter 1124. The pressure of fluid exiting second ultrafilter 1124 must be within a safe range for infusion into the patient 1147. A control system can control the system pump 1103 to adjust the peritoneal dialysate flow rate and maintain the pressure within a predetermined range exiting the second ultrafilter 1124. In certain embodiments, the system can automatically generate an alert if the pressure at either or both of pressure sensor 1127 or 1122 is outside of a predetermined range. In certain embodiments, the control system can adjust the peritoneal dialysate flow rate to maintain a pressure of between −200 mmHg to 500 mmHg, from −50 mmHg to 100 mmHg, from 0 mmHg to 100 mmHg, from 31 50 mmHg to 200 mm Hg, from 200 mmHg to 500 mmHg, or from 100 mmHg to 400 mmHg.
One skilled in the art will understand that various combinations and/or modifications and variations can be made in the described systems and methods depending upon the specific needs for operation. Moreover, features illustrated or described as being part of an aspect of the invention may be used in the aspect of the invention, either alone or in combination, or follow a preferred arrangement of one or more of the described elements.
This application is a continuation in part of U.S. patent application No. 15/478,569 filed Apr. 4, 2017, which claims benefit of and priority to U.S. Provisional Application No. 62/318,173 filed Apr. 4, 2016, and the disclosures of each of the above-identified applications are hereby incorporated by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62318173 | Apr 2016 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15478569 | Apr 2017 | US |
| Child | 15723764 | US |
