WO2023278116A1 - Drain electrical devices, methods, and systems - Google Patents
Drain electrical devices, methods, and systems Download PDFInfo
- Publication number
- WO2023278116A1 WO2023278116A1 PCT/US2022/032771 US2022032771W WO2023278116A1 WO 2023278116 A1 WO2023278116 A1 WO 2023278116A1 US 2022032771 W US2022032771 W US 2022032771W WO 2023278116 A1 WO2023278116 A1 WO 2023278116A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rollers
- shoe
- curved surface
- rotor
- central rotor
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 34
- 238000005086 pumping Methods 0.000 claims abstract description 144
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 80
- 239000012530 fluid Substances 0.000 claims description 77
- 230000007246 mechanism Effects 0.000 claims description 40
- 230000004044 response Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 description 5
- 238000000502 dialysis Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 210000003238 esophagus Anatomy 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 238000001631 haemodialysis Methods 0.000 description 1
- 230000000322 hemodialysis Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000008855 peristalsis Effects 0.000 description 1
- 210000003200 peritoneal cavity Anatomy 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000012959 renal replacement therapy Methods 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000002861 ventricular Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1238—Machines, pumps, or pumping installations having flexible working members having peristaltic action using only one roller as the squeezing element, the roller moving on an arc of a circle during squeezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
- F04B43/1269—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing the rotary axes of the rollers lying in a plane perpendicular to the rotary axis of the driving motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
- F04B43/1284—Means for pushing the backing-plate against the tubular flexible member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
Definitions
- a leakage current path may be formed in a fluid line, such as a drain line.
- fluid is pumped through a fluid line using a pump, such as a peristaltic pump.
- a peristaltic pump includes a rotor around which a plurality of rollers is disposed, and the rollers come into contact with a piece of compliant tubing and press it against a part referred to as a pump shoe.
- a peristaltic pump reduces or entirely blocks and prevents the flow of leakage current through the pipe which is serving as the pumping tube segment, by ensuring that conductive fluid in the pumping tube segment is forced out of certain areas and thereby interrupting a conductive pathway through the pumping tube segment.
- FIGs. 1A and IB illustrate a peristaltic pump according to embodiments of the disclosure.
- Fig. 1C illustrates various dimensions of a peristaltic pump according to embodiments of the disclosed subject matter.
- FIGs. 2A and 2B illustrate a peristaltic pump according to further embodiments of the disclosed subject matter.
- FIGs. 3A and 3B illustrate a peristaltic pump with a pump shoe according to embodiments of the disclosed subject matter.
- FIGs. 4A-4C illustrate a peristaltic pump with a pump shoe and pressing cones according to embodiments of the disclosed subject matter.
- FIG. 5 illustrates a peristaltic pump with a larger pump shoe according to embodiments of the disclosed subject matter.
- FIG. 6 illustrates a process flow for controlling peristaltic pump according to embodiments of the disclosed subject matter.
- a peristaltic pump 100 is shown.
- a rotor 120 carries a number of circumferential rollers (101, 102, 103, 104), possibly mounted on bearings, each of which is arranged to compress a flexible tube 130.
- the tube is fabricated from a resilient material and thus reassumes its normal cross-sectional profile afterthe compression by the roller ceases. This process of peristalsis mimics many biological systems (such as the action of esophagus or the gastrointestinal tract). A body of fluid (or bolus) trapped between two successive rollers is thus transported at ambient pressure toward the pump outlet.
- the peristaltic pump 100 includes a rotor 120 mounted on and rotatable about a central point or axis 121, and positioned in close proximity to a pumping shoe 125. As indicated by the double-sided arrow in Fig. 1A, the rotor 120 and the shoe 125 can be moved relative to each other such that the gap between the rotor 120 and the shoe 125 can be increased or decreased.
- the shoe 125, the rotor 120, or both may be installed on a shaft or rod 114 that is inserted in a spring 116 or other biasing mechanisms which urges the rotor and the shoe against each other, as shown in Fig. 1A.
- central axis 121 of the rotor 120 can also be biased in addition to the shoe 125, or be biased instead of the shoe 125 with a biasing mechanism, such as a spring, an electro-magnet, a linear motor, or a hydraulic piston, and other mechanisms that can apply a force or a torque on the axis 121.
- a biasing mechanism such as a spring, an electro-magnet, a linear motor, or a hydraulic piston, and other mechanisms that can apply a force or a torque on the axis 121.
- the central rotor 120 includes multiple pumping rollers installed around its outer circumference.
- individual pumping rollers 101, 102, 103, and 104 are shown, but fewer or more rollers may be present, as described in other embodiments of the present disclosure.
- the rollers 101, 102, 103, and 104 are spaced at equal angular spacing around the circumference of the rotor 120.
- Each of the rollers is mounted on its own axis which allows the roller to rotate.
- each of the multiple axes of the rollers is positioned on the outer circumference of the rotor 120.
- Fig. 1A illustrates the entire circumference of each roller to aid in the understanding, but it will be understood that normally the entire circumference of the individual or rollers would not be visible as it would be covered by a portion of the rotor 120. Thus, Fig. 1A can be thought of as a schematic representation, or a partial cut-away that shows the rollers without obstructions.
- the rotor 120 rotates in the clockwise direction in Fig. 1A, as indicated by the dashed arrow to cause the peristaltic pump to pump fluid through a pumping tube segment.
- a length of compliant hollow tube is positioned in the space between the rotor 120 and the shoe 125. This part of a hollow tube is referred to as a pumping tube 130 or a pumping tube segment 130.
- pinch points 135 there are two pinch points 135 created by rollers 102 and 103 when the rotor 120 is at the particular angular position shown.
- the walls of the pumping tube collapse such that all fluid is pressed out of the tube at that location.
- the pinch point migrates along the curved surface 145 of the shoe 125 and thereby urges fluid ahead of the pinch point to move in the rotation direction of the rotor 120.
- the capital letter A represents the angular spacing of rotors along the central rotor 120.
- the angular spacing is 90 degrees because the four rollers illustrated in Fig. 1A are spaced equally around the outer circumference of central rotor 120. As noted above, there can be more or fewer than four rollers. In embodiments, the angular spacing is 120 degrees.
- the pumping tube segment 130 may be filled with a fluid which can conduct electricity along the length of the pumping tube segment.
- the pumping tube segment is fluidly connected to or a part of a drain line of a peristaltic dialysis system. In this situation, dialysate will at times flow through the pumping tube segment 130.
- the pumping tube segment is fluidly connected inline with a drain line in a peritoneal dialysis system, conveying waste dialysate from a patient (peritoneal cavity) to a drain.
- the drain may be at ground potential. This creates a risk of leakage current flowing through the dialysate and the pumping tube segment 130 to ground.
- the central rotor 120 has rotated by approximately 45°, and it can be seen that in this situation, pumping roller 102 remains pressed against pumping tube segment 130 at the pinch point 135, while pumping roller 103 is no longer in contact with the pumping tube segment 130. In this situation, only a single pinch point 135 is created for at least a portion of the peristaltic pumping cycle.
- the spacing between the central rotor 120 and the shoe 125 can be adjusted such that a sufficient force is applied by the rollers against the pumping tube segment 130 whenever a roller is in contact with the pumping tube segment.
- the pumping tube segment size and material durometer, roller diameter and width, length and curvature of surface 145 are selected to ensure that complete occlusion occurs at the pinch point 135.
- peristaltic pump 100 as shown in Fig. IB, is shown.
- the angular spacing of the rollers is the same as shown in Fig. 1A.
- the length of the curve the surface 145 of the shoe 125 is represented by capital letter L.
- the length L is the length measured around the curvature of the surface.
- the curved surface of shoe 125 has an angular extent. There is a correlation between the angular extent a and the length L as will be understood.
- the length L can be determined as a part of a circumference of that circle.
- the angular extent a is related to the angular distribution of the rollers along the rotor 120.
- the angular extent a is sufficiently large to guarantee that two rollers are always positioned radially against the curved surface such that two pinch points 135 are provided when a pumping tube segment is inserted into the space between the rotor 120 and the shoe 125.
- the angular spacing of the rollers is A degrees (Fig.
- the angular extent a is greater than or equal to 2 x A degrees, which guarantees that two pinch points 135 will always be present when the rotor 120 rotates through 360 degrees.
- providing more rollers (and thus decreasing A) can be used to ensure two pinch points 135 when the angular extent a needs to be small (due to other design constraints).
- the angular extent a of the shoe curved surface can be selected to ensure at least two pinch points 135 when the number of rollers is constrained.
- a peristaltic pump 100 reduces or eliminates electrical current flow in the pumping tube segment 130 by coupling a rotor with rollers that are separated from adjacent rollers by A degrees with a pump shoe that has an angular extent a greater than or equal to 2 x A degrees.
- FIG. 2A an embodiment of a peristaltic pump 200 which ensures that at least two pinch points (but possibly more) are created at all times is shown for increased clarity, the pumping tube segment 130 is omitted from Fig. 2A, but it will be understood that the pumping tube segment 130 would be installed much as in Fig. 1A.
- Peristaltic pump 200 includes a central rotor 220 which has multiple rollers disposed around its outer circumference.
- the multiple rollers are grouped into roller groups.
- four roller groups are present.
- Each of the four rollergroups has two rollers.
- Rollers 201 and 202 are members of a first roller group; rollers 203 and 204 are members of a second roller group; rollers 205 and 206 are members of a third roller group; and rollers 207 and 208 are members of a fourth roller group.
- roller groups Although four roller groups are illustrated in Fig. 2A, it will be understood that there may be more or fewer roller groups present, and that each roller group may have more than two rollers in it.
- the specific number of roller groups and rollers within each group is dictated by the size of the rotor 220 and the length of the surface 145 of the shoe 125. In embodiments, the number of rollergroups, number of rollers per roller group, and the length of the surface 145 are selected such that at all times there are two or more pinch points 135 along the pumping tube segment 130.
- the length of the surface 145 of the pumping shoe 25 it is the length L along the curved surface 145 which mates with the pumping tube segment that is referenced.
- the spacing of all rollers along the circumference of the rotor 220 is not uniform, but instead rollers in a roller group are closer to other rollers in that group.
- rollers in a roller group are closer to other rollers in that group.
- each roller group separated from the adjacent roller group by 90 degrees similar to the arrangement in Fig. 1A. More specifically, the middle of each roller group is 90 degrees from the middle of an adjacent roller group, even if individual rollers in one group may be less than 90 degrees spaced from rollers in another roller group.
- each roller group includes two rollers which are closer to each other then they are to rollers in other roller groups.
- at least 2 rollers included in one or more of the roller groups pinch respective portions of the pumping tube segment 130 against the curved surface through a full rotation of the rotor 220.
- there are four roller groups and each roller group includes three rollers.
- there are three roller groups and each roller group includes two rollers, three rollers, or four rollers.
- the pump 290 includes a rotor 320 which has on it multiple roller groups.
- Roller group 321 is indicated in the figure, and includes separate rollers 301, 302, and 303.
- the pump illustrated in the embodiment of Fig. 2B includes four roller groups, but fewer or more roller groups can be present.
- the rotor 320 includes four roller groups, and each roller group includes three rollers. More specifically, rollers 304, 305, and 306 are members of a roller group; rollers 307, 308, and 309 are members of another roller group; and rollers 310, 311, and 312 are members of yet another roller group.
- this arrangement guarantees that there will always be at least 3 points of a contact (pinch points 135) on the pumping tube segment 130 (which is not illustrated in Fig. 2B for clarity).
- at least 3 rollers included in one or more of the roller groups pinch respective portions of the pumping tube segment 130 against the curved surface through a full rotation of the rotor 320.
- Fig. 3A illustrates peristaltic pump 300 which includes a rotor 120 with rollers 101, 102, 103, and 104.
- the peristaltic pump 300 in this embodiment includes a modified shoe 325, as shown.
- the modified shoe 325 has a curved surface 345 which faces toward the rotor 120.
- the modified shoe 325 may be biased by spring 116 along biasing a rod 114, or other urging mechanism, similarly, to pump 100 in Fig. 1A.
- the curved surface 345 of modified shoe 325 includes a protrusion 335.
- the protrusion 335 is a discontinuity in the curvature of the curved surface 345 and has the effect of creating a pressure spike when any of the rollers rolls over the protrusion.
- the occlusion of the tube 130 (not illustrated to increase clarity) is increased.
- the likelihood that any conductive fluid remains in the occluded portion of tube 130 is reduced, thus reducing the possibility of a leakage current flowing through pumping tube segment 130.
- pumping shoe 326 may include more than one protrusion 335.
- two protrusions 335 are present along the curved surface 346.
- three protrusions 335 are present, and spaced with an equal distribution along the curved surface 346.
- the rotor includes three rollers, four rollers, five rollers, six rollers, seven rollers, or eight rollers. It will be understood that the pump shoe 325 and 326, with one or more protrusions 335 can be used with any of the rotors described in the present disclosure.
- Fig. 4A illustrates an embodiment of pump shoe 427 with a plunger 420 protruding through an opening 450 in the curved surface 447.
- the plunger 420 can be a curved plunger, as illustrated, mounted on a movable platform such as a rod biased with a spring 416.
- the spring can be omitted or substituted with a hydraulically actuated plunger which can move the leading tip, or edge, of plunger 420 in and out of the surface 447.
- the view shown in Fig. 4A can be thought of as a cross sectional view as the top of plunger 420 protrudes through an opening 450 in the surface 447.
- the tip may have a conical cross-section as shown.
- pump shoe 427 may be used with any of the pump rotors described in the present disclosure.
- pump rotor 120 may be used with pump shoe 427.
- the conical tip of plunger 420 protrudes from the middle of the curved surface 447 of pump shoe 427.
- the plunger 420 is positioned at a location that is not in the middle of the curved surface 448 of shoe 428, but instead closer to one end of the surface.
- the opening 450 is not expressly illustrated, but it is understood that the plunger extends out of an opening, much like in Fig. 4A. This arrangement may increase pumping efficiency (volume per number of rotor rotations).
- multiple plungers 420 may be used, as illustrated in Fig. 4C.
- Two plungers 420 are positioned toward two ends of the curved surface 449 of pump shoe 429. It will be understood that the plungers 420 generate an increased pressure at a pinch point formed between a roller and the plunger, thereby reducing the possibility of a conductive fluid being retained at the pinch point inside of pumping tube segment 130. Thus, an electrical current cannot flow through the pumping tube segment 130.
- a peristaltic pump 500 includes a central rotor 520, which is not necessarily circular in shape.
- the central rotor may have a substantial triangular shape, or a star shape.
- the central rotor shape illustrated and described here can be used with any of the other peristaltic pumps described in this disclosure, and the term rotor does not necessarily require a circular shape.
- the rotor 520 has three rollers 501, 502, and 503.
- the rotor 520 is positioned against pump shoe 525 which has a curved surface 545 that has a length indicated by the dashed line at 546.
- the length of the curved surface 545 of the shoe 525 is greater than the length of the other curved surfaces shown in the other figures.
- the goal of ensuring that two rollers are always in contact with a pumping tube segment 130 (which is not illustrated in Fig. 5 for increased clarity) can be maintained with fewer than four rollers on a rotor, by extending the length of the curved surface of the pump shoe.
- a peristaltic pump includes a rotor with three rollers mounted on the outer circumference of the rotor, and a pump shoe which has a curved surface which presses against the rollers and has a length that is sufficient to ensure that at least two of the rollers are always in contact with the curved surface during operation of the pump.
- Fig. 6 illustrates a process for reducing or blocking electrical leakage current in a pumping tube segment 130 using a peristaltic pump according to any of the disclosed embodiments.
- a peristaltic pump according to the process illustrated in Fig. 6 to further reduce or eliminate leakage current.
- the pump rotor rotates forward (in the normal direction) to cause fluid to be pumped through the pumping tube segment.
- an electrical current sensor (not illustrated) is provided to detect electrical current flowing through the pumping tube segment 130. If the electrical current sensor detects a current above a predetermined threshold (such as 50 mA) at S620, the process continues at S630. On the other hand, if no electrical current is detected, the pump rotor operates normally.
- the peristaltic pump is controlled to block the flow of current.
- the peristaltic pump rotor continues rotating forward until two rollers are in contact with the pumping tube segment and pressing against the pumping shoe, thus ensuring that are two pinch points exist.
- the pump rotor when electrical current is detected, the pump rotor is reversed and rotates in the opposite direction, until rollers come to rest at a position that creates two pinch points.
- the peristaltic pump rotor is stopped and the pressure between the roller that is in contact with the pumping tube segment and the pump shoe is increased.
- the rotor may rotate forward or backwards until one roller stops at a position that maximizes the pressure on the pumping tube segment. For example, this position may be substantially horizontal in Fig. 5 such that roller 502 would be pressing into the middle of surface 545.
- pump shoe 525 is mounted on a pressure biasing mechanism similar to that shown in Fig. 1A, the pressure from that mechanism acts directly against the roller 502, thus maximizing the pressure on the pumping tube segment at that location, thereby minimizing the possibility of a conductive fluid being present at that location of the pumping tube segment.
- this increase in pressure can be achieved by increasing the spring tension of a biasing spring such as spring 116 described above.
- the pressure can be increased with a pressure mechanism such as those described above, which presses the rotor and/or the pump shoe against each other with a pressure that is greater than the normal operating pressure.
- the pinch point that is maintained at this state is under a greater pressure than a normal operating pressure, thus reducing the possibility of fluid being present in the pumping tube segment at the pinch point.
- S630 includes stopping the rotation of the rotor which is initially rotating in the forward, rotating the rotor in the reverse direction for several degrees of rotation (e.g., 5, 10, 15, 20, 25 degrees), and then again rotating in the forward direction.
- This action forces out fluid that may be at the pinch point through a squeegee action, without the need for increasing the pressure at the pinch point.
- this operation can be combined with the other disclosed embodiments.
- the forward and backward rocking of the rotor can take place with a roller on one of the protrusions 335 of the pump shoe, to further enhance the squeegee effect and force out fluid from the pumping tube segment 130 at a pinch point.
- a medical system such as one used for renal replacement therapy, may include a dialysis system (hemodialysis, peritoneal dialysis, and others). It is desirable in such a system to eliminate or reduce electrical current flowing in various fluid lines (hollow tubes that convey a fluid, often a conductive fluid). A peristaltic pump according to disclosed embodiments reduces or eliminates such electrical current.
- a dialysis system hemodialysis, peritoneal dialysis, and others. It is desirable in such a system to eliminate or reduce electrical current flowing in various fluid lines (hollow tubes that convey a fluid, often a conductive fluid).
- a peristaltic pump reduces or eliminates such electrical current.
- One general aspect includes a peristaltic pump that reduces electrical current flowing through a pumping tube segment, and may include a central rotor mounted on a central rotation axis; a shoe with a curved surface facing toward the central rotor; a plurality of rollers mounted along a circumference of the central rotor; and the pumping tube segment positioned between the curved surface and the central rotor, where each roller of the plurality of rollers is a member of a roller group, each roller group may include at least two rollers, rollers in a particular rollergroup are physically located closerto each otherthan to rollers in other roller groups; and at least two rollers pinch a portion of the pumping tube segment against the curved surface through a full rotation of the central rotor.
- Implementations of the first aspect may include one or more of the following features.
- the physical location of a roller is determined by a center of the roller.
- Each roller group may include three rollers.
- a peristaltic pump that reduces electrical current flowing through a pumping tube segment, and may include a central rotor mounted on a central rotation axis; a shoe with a curved surface facing toward the central rotor and having a length of the curved surface measured along the curved surface in a circumferential direction; and a plurality of rollers mounted along a circumference of the central rotor, where a pumping tube is positioned between the central rotor and the shoe, a pinch point on the pumping tube is defined between any roller pressing radially away from the central rotation axis against the shoe, and a number of the rollers and the length of the curved surface provide at least two pinch points on the pumping tube segment at all times when the central rotor rotates through 360 degrees.
- Implementations of this aspect may include one or more of the following features.
- the at least two pinch points are three pinch points.
- the plurality of rollers is distributed evenly around the circumference of the central rotor with an angular spacing of A degrees, and an angular extent of the curved surface is greater than or equal to two times A.
- a peristaltic pump that reduces electrical current flowing through a pumping tube segment, and may include a central rotor mounted on a central rotation axis; a shoe with a curved surface facing toward the central rotor and having a length of the curved surface measured along the curved surface in a circumferential direction; and a plurality of rollers mounted along a circumference of the central rotor, where a pumping tube is positioned between the central rotor and the shoe, a pinch point on the pumping tube is defined between any roller pressing radially away from the central rotation axis against the shoe, and the curved surface of the shoe may include one or more protrusions toward the central rotor, such that pressure on the pumping tube segment between a roller and the protrusion is greater than pressure on the pumping tube segment at any other location.
- the curved surface may include two protrusions that increase the pressure on the pumping tube segment at two different locations.
- the peristaltic pump may include a biasing mechanism that exerts a force on the shoe in a direction toward the central rotor.
- the biasing mechanism may include a spring on a rod.
- the biasing mechanism may include a motor that receives control signals that modulate force applied by the motor to the shoe.
- the central rotor may be pivotally mounted on a rotation axis, and a biasing mechanism may exert a force on the rotation axis in a direction toward the shoe to press the central rotor toward the curved surface of the shoe.
- the one or more protrusions may include a movable plunger that extends out of the curved surface of the shoe.
- the peristaltic pump may include an opening in the curved surface through which the plunger extends out of the curved surface.
- the plunger may be urged toward the central rotor by a biasing mechanism.
- the biasing mechanism may include a passive spring.
- the biasing mechanism may include a motor that is controlled by electrical signals and exerts a force with a magnitude that is based on the electrical signals.
- the shoe may include two plungers extending from the curved surface at two different locations.
- Another general aspect includes a method of pumping a conductive fluid while reducing electrical current flowing through the conductive fluid, and the method may include providing a fluid pump; pumping the conductive fluid with the fluid pump; detecting a presence of the electrical current in the conductive fluid during the pumping; measuring a magnitude of the detected electrical current; comparing the measured magnitude of the electrical current against a predetermined threshold value; and, in response to exceeding the threshold value, modifying the pumping of the fluid pump to reduce the electrical current flowing through the conductive fluid.
- the fluid pump may include a peristaltic pump with a central rotor, a plurality of rollers attached to the central rotor, a pump shoe with a curved surface that is placed adjacent to the central rotor, and a pumping tube segment positioned between the central rotor and the curved surface.
- the pumping of the conductive fluid may include rotating the central rotor in a first direction.
- the modifying the pumping of the fluid pump may include stopping the fluid pump in a state where at least two rollers press on a pumping tube segment against a pump shoe.
- the modifying the pumping of the fluid pump may include rotating the rotor forward or backward until at least one roller is positioned directly against a protrusion on the curved surface of the pump shoe.
- the modifying the pumping of the fluid pump may include increasing pressure between the rollers and the pump shoe.
- the increasing the pressure may include using a biasing mechanism to increase a force on a central axis of the rotor in a direction toward the pump shoe.
- the increasing the pressure may include using a biasing mechanism to increase a force on the pump shoe in a direction toward a central axis of the rotor.
- the increasing the pressure may include using a first biasing mechanism to increase a force on a central axis of the rotor in a direction toward the pump shoe, and using a second biasing mechanism to increase a force on the pump shoe in a direction toward the central axis of the rotor.
- the fluid pump may include a peristaltic pump with a central rotor, a plurality of roller groups each including two or more rollers attached to the central rotor, a shoe with a curved surface that is disposed adjacent to the central rotor, and a pumping tube segment positioned between the central rotor and the curved surface, wherein rollers in a same one of the rollergroups are physically located closerto each otherthan to rollers in other ones of the roller groups, and wherein at least two rollers included in one or more of the roller groups pinch respective portions of the pumping tube segment against the curved surface through a full rotation of the central rotor.
- a peristaltic pump that reduces electrical current flowing through a pumping tube segment, including: a central rotor mounted on a central rotation axis; a shoe with a curved surface facing toward the central rotor; a plurality of rollers mounted along a circumference of the central rotor; and the pumping tube segment positioned between the curved surface and the central rotor, wherein each roller of the plurality of rollers is a member of a roller group, each roller group includes at least two rollers, rollers in a particular roller group are physically located closer to each other than to rollers in other roller groups, and at least two rollers pinch a portion of the pumping tube segment against the curved surface through a full rotation of the central rotor.
- peristaltic pump of the first further embodiment or any of the other foregoing embodiments wherein the physical location of a roller is determined by a center of the roller.
- peristaltic pump of the first further embodiment or any of the other foregoing embodiments wherein each roller group includes three rollers.
- a peristaltic pump that reduces electrical current flowing through a pumping tube segment, including: a central rotor mounted on a central rotation axis; a shoe with a curved surface facing toward the central rotor and having a length of the curved surface measured along the curved surface in a circumferential direction; and a plurality of rollers mounted along a circumference of the central rotor, wherein a pumping tube is positioned between the central rotor and the shoe, a pinch point on the pumping tube is defined between any roller pressing radially away from the central rotation axis against the shoe, and a number of the rollers and the length of the curved surface provide at least two pinch points on the pumping tube segment at all times when the central rotor rotates through 360 degrees.
- the peristaltic pump of the fourth further embodiment or any of the other foregoing embodiments wherein the at least two pinch points are three pinch points.
- the peristaltic pump of the fourth further embodiment or any of the other foregoing embodiments wherein the plurality of rollers is distributed evenly around the circumference of the central rotor with an angular spacing of A degrees, and an angular extent of the curved surface is greater than or equal to two times A.
- a peristaltic pump that reduces electrical current flowing through a pumping tube segment, including: a central rotor mounted on a central rotation axis; a shoe with a curved surface facing toward the central rotor and having a length of the curved surface measured along the curved surface in a circumferential direction; and a plurality of rollers mounted along a circumference of the central rotor, wherein a pumping tube is positioned between the central rotor and the shoe, a pinch point on the pumping tube is defined between any roller pressing radially away from the central rotation axis against the shoe, and the curved surface of the shoe includes one or more protrusions toward the central rotor, such that pressure on the pumping tube segment between a roller and the protrusion is greater than pressure on the pumping tube segment at any other location.
- the peristaltic pump of the seventh further embodiment or any of the other foregoing embodiments wherein the curved surface includes two protrusions that increase the pressure on the pumping tube segment at two different locations.
- the peristaltic pump of the seventh further embodiment or any of the other foregoing embodiments further including a biasing mechanism that exerts a force on the shoe in a direction toward the central rotor.
- the biasing mechanism includes a spring on a rod.
- the peristaltic pump of the ninth further embodiment or any of the other foregoing embodiments wherein the biasing mechanism includes a motor that receives control signals that modulate force applied by the motor to the shoe.
- the peristaltic pump of the seventh further embodiment or any of the other foregoing embodiments wherein the central rotor is pivotally mounted on a rotation axis, and a biasing mechanism exerts a force on the rotation axis in a direction toward the shoe to press the central rotor toward the curved surface of the shoe.
- the peristaltic pump of the seventh further embodiment or any of the other foregoing embodiments wherein the one or more protrusions include a movable plunger that extends out of the curved surface of the shoe.
- the peristaltic pump of the thirteenth further embodiment or any of the other foregoing embodiments further including: an opening in the curved surface through which the plunger extends out of the curved surface.
- the peristaltic pump of the thirteenth further embodiment or any of the other foregoing embodiments wherein the plunger is urged toward the central rotor by a biasing mechanism.
- the peristaltic pump of the fifteenth further embodiment or any of the other foregoing embodiments wherein the biasing mechanism includes a passive spring.
- the peristaltic pump of the thirteenth further embodiment or any of the other foregoing embodiments wherein the biasing mechanism includes a motor that is controlled by electrical signals and exerts a force with a magnitude that is based on the electrical signals.
- a method of pumping a conductive fluid while reducing electrical current flowing through the conductive fluid including: providing a fluid pump; pumping the conductive fluid with the fluid pump; detecting a presence of the electrical current in the conductive fluid during the pumping; measuring a magnitude of the detected electrical current; comparing the measured magnitude of the electrical current against a predetermined threshold value; and in response to exceeding the threshold value, modifying the pumping of the fluid pump to reduce the electrical current flowing through the conductive fluid.
- the fluid pump includes a peristaltic pump with a central rotor, a plurality of rollers attached to the central rotor, a pump shoe with a curved surface that is placed adjacent to the central rotor, and a pumping tube segment positioned between the central rotor and the curved surface.
- the pumping of the conductive fluid includes rotating the central rotor in a first direction.
- the modifying the pumping of the fluid pump includes stopping the fluid pump in a state where at least two rollers press on a pumping tube segment against a pump shoe.
- the modifying the pumping of the fluid pump includes rotating the rotor forward or backward until at least one roller is positioned directly against a protrusion on the curved surface of the pump shoe.
- the modifying the pumping of the fluid pump includes increasing pressure between the rollers and the pump shoe.
- the increasing the pressure includes using a biasing mechanism to increase a force on a central axis of the rotor in a direction toward the pump shoe.
- the modifying the pumping of the fluid pump includes rotating the rotor forward and backward to squeegee fluid out of a contact pinch point.
- the fluid pump includes a peristaltic pump with a central rotor, a plurality of roller groups each including two or more rollers attached to the central rotor, a shoe with a curved surface that is disposed adjacent to the central rotor, and a pumping tube segment positioned between the central rotor and the curved surface; rollers in a same one of the roller groups are physically located closer to each other than to rollers in other ones of the roller groups; and at least two rollers included in one or more of the roller groups pinch respective portions of the pumping tube segment against the curved surface through a full rotation of the central rotor.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2022302967A AU2022302967A1 (en) | 2021-06-30 | 2022-06-09 | Drain electrical devices, methods, and systems |
CA3223175A CA3223175A1 (en) | 2021-06-30 | 2022-06-09 | Drain electrical devices, methods, and systems |
CN202280046839.1A CN117597513A (en) | 2021-06-30 | 2022-06-09 | Discharge electrical device, method and system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US202163216725P | 2021-06-30 | 2021-06-30 | |
US63/216,725 | 2021-06-30 |
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WO2023278116A1 true WO2023278116A1 (en) | 2023-01-05 |
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ID=84691510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/US2022/032771 WO2023278116A1 (en) | 2021-06-30 | 2022-06-09 | Drain electrical devices, methods, and systems |
Country Status (5)
Country | Link |
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US (1) | US20230003209A1 (en) |
CN (1) | CN117597513A (en) |
AU (1) | AU2022302967A1 (en) |
CA (1) | CA3223175A1 (en) |
WO (1) | WO2023278116A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR854088A (en) * | 1938-12-10 | 1940-04-04 | Pump for various uses including medical, surgical and scientific | |
US5746585A (en) * | 1996-12-31 | 1998-05-05 | Motorola, Inc. | Peristaltic pump and method in a peristaltic pump for advancing a tube from a first position to a second position |
WO2020190778A1 (en) * | 2019-03-15 | 2020-09-24 | Nxstage Medical, Inc. | Peristaltic pump |
DE202020101287U1 (en) * | 2020-03-09 | 2021-06-17 | Ulrich Gmbh & Co. Kg | Peristaltic pump |
-
2022
- 2022-06-09 WO PCT/US2022/032771 patent/WO2023278116A1/en active Application Filing
- 2022-06-09 CA CA3223175A patent/CA3223175A1/en active Pending
- 2022-06-09 CN CN202280046839.1A patent/CN117597513A/en active Pending
- 2022-06-09 US US17/836,164 patent/US20230003209A1/en active Pending
- 2022-06-09 AU AU2022302967A patent/AU2022302967A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR854088A (en) * | 1938-12-10 | 1940-04-04 | Pump for various uses including medical, surgical and scientific | |
US5746585A (en) * | 1996-12-31 | 1998-05-05 | Motorola, Inc. | Peristaltic pump and method in a peristaltic pump for advancing a tube from a first position to a second position |
WO2020190778A1 (en) * | 2019-03-15 | 2020-09-24 | Nxstage Medical, Inc. | Peristaltic pump |
DE202020101287U1 (en) * | 2020-03-09 | 2021-06-17 | Ulrich Gmbh & Co. Kg | Peristaltic pump |
Also Published As
Publication number | Publication date |
---|---|
AU2022302967A1 (en) | 2023-12-21 |
CA3223175A1 (en) | 2023-01-05 |
CN117597513A (en) | 2024-02-23 |
US20230003209A1 (en) | 2023-01-05 |
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