Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
  • B65B3/04—Methods of, or means for, filling the material into the containers or receptacles
  • B65B3/10—Methods of, or means for, filling the material into the containers or receptacles by application of pressure to material
  • B65B3/12—Methods of, or means for, filling the material into the containers or receptacles by application of pressure to material mechanically, e.g. by pistons or pumps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
  • A61M5/142—Pressure infusion, e.g. using pumps
  • A61M5/14212—Pumping with an aspiration and an expulsion action
  • A61M5/14216—Reciprocating piston type
  • A61M5/1422—Reciprocating piston type with double acting or multiple pistons
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
  • A61M5/142—Pressure infusion, e.g. using pumps
  • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
  • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
  • A61M5/14546—Front-loading type injectors
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
  • B65B3/003—Filling medical containers such as ampoules, vials, syringes or the like
• • 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
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
• • 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
  • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
• • 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
  • F04B23/00—Pumping installations or systems
  • F04B23/02—Pumping installations or systems having reservoirs
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
  • A61M5/142—Pressure infusion, e.g. using pumps
  • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
  • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
  • A61M2005/14533—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons cam actuated

Definitions

• the embodiments described below relate to, fluid control devices, and more particularly, to dual syringe fluid pumps.
• Pumps are able to continuously dispense fluid that has desired properties.
• the desired properties can include pressure and flow rates.
• Some applications also require that the properties be within a specified range. That is, the pumps may be required to meet precision and accuracy specifications.
• pumps that are able to continuously dispense fluids are often unable to meet theses specifications.
• pumps that are able to meet the precision and accuracy specifications are usually unable to meet these specifications over large number of dispenses.
• some prior art pumps can only be used for a single dispensing of fluids, such as dual syringe insulin pumps. Pumps that are able to continuously dispense fluids in precise and accurate amounts can have complex designs that utilize gears, multiple motors, and other devices.
• Complex pump designs can have disadvantages such as increased costs and lack of repeatability over large number of cycles or dispenses due to design tolerances accumulating over several parts. Accumulated design tolerances can cause large overall manufacturing variations in the pumps or syringes. This large tolerance can cause the fluid dispensed from the pump to vary considerably on a pump to pump basis. The variations can also cause the fluid dispensing to lack precision. That is, the amount dispensed from the pump can vary between dispenses. Such variation in the amount of dispensed fluid is undesirable for applications that require precision and accuracy. For example, the fluid can be syrup dispensed into a mixture that is bottled for consumers who might be able to detect even a slight change in flavor.
• pumps can sometimes be calibrated or adjusted after being manufactured, such adjustability and calibration can lead to further complexity. Complex designs can also adversely affect the reliability of the pumps.
• a dual syringe fluid pump provided that is comprised of a motor with a rotatable shaft.
• the dual syringe fluid pump further comprises a first syringe with a first syringe plunger coupled to the rotatable shaft and a second syringe with a second syringe plunger coupled to the rotatable shaft.
• the motor rotates the rotatable shaft to simultaneously move the first syringe plunger and the second syringe plunger and at least one of the syringes is adapted to convert a rotation of the rotatable shaft to a linear movement of at least one of the syringe plungers.
• a method of forming a dual syringe fluid pump comprises forming a motor with a rotatable shaft, forming a first syringe with a first syringe plunger and coupling the first syringe plunger to the rotatable shaft, forming a second syringe with a second syringe plunger and coupling the second syringe plunger to the rotatable shaft.
• the method further comprises adapting the motor to rotate the rotatable shaft to simultaneously move the first syringe plunger and the second syringe plunger and adapting at least one of the syringes to convert a rotation of the rotatable shaft to a linear movement of at least one of the syringe plungers.
• a method of using a dual syringe fluid pump comprises providing a dual syringe fluid pump comprised of a motor with a rotatable shaft, a first syringe with a first syringe plunger coupled to the rotatable shaft, and a second syringe with a second syringe plunger coupled to the rotatable shaft.
• the method further comprises providing fluid from a fluid source to the first syringe and the second syringe, and rotating the rotatable shaft and converting the rotation of the rotatable shaft to a linear movement of at least one of the syringe plungers to dispense fluid from the first syringe while simultaneously aspirating fluid into the second syringe from the fluid source.
• a dual syringe fluid pump (100, 200, 300, 400) comprises a motor (110, 210, 310, 410) with a rotatable shaft (112, 212, 312, 412), a first syringe (120a, 220a, 320a, 420a) with a first syringe plunger (122a, 222a, 322a, 422a) coupled to the rotatable shaft (112, 212, 312, 412), and a second syringe (120b, 220b, 320b, 420b) with a second syringe plunger (122b, 222b, 322b, 422b) coupled to the rotatable shaft (112, 212, 312, 412), wherein the motor (110, 210, 310, 410) rotates the rotatable shaft (112, 212, 312, 412) to simultaneously move the first syringe plunger (122a, 222a, 322a
• At least one of the syringes (120a,b) further comprises a barrel (124a) with a center bore (124cb) having a profile that prevents rotation of the at least one of the syringe plungers (122a,b) to convert the rotation of the rotatable shaft (112) to the linear movement of the at least one of the syringe plungers (122a,b).
• the dual syringe fluid pump (200) further comprises a constraint
• the motor (110, 210, 310, 410) is further adapted to simultaneously move the first syringe plunger (122a, 222a, 322a, 422a) and the second syringe plunger (122b, 222b, 322b, 422b) to aspirate fluid into the first syringe (120a, 220a, 320a, 420a) and dispense fluid from the second syringe (120b, 220b, 320b, 420b).
• the at least one of the syringes (120a,b, 220a,b, 320a,b, 420a,b) further comprises a first valve (126ai,bi, 226ai,bi, 326ai,bi, 426ai,bi) adapted to allow fluid to flow into the at least one of the syringes (120a,b, 220a,b, 320a,b, 420a,b), and a second valve (126ao,bo, 226ao,bo, 326ao,bo, 426ao,bo) adapted to allow fluid to flow out of the at least one of the syringes (120a,b, 220a,b, 320a,b, 420a,b).
• a first valve 126ai,bi, 226ai,bi, 326ai,bi, 426ai,bi
• a second valve 126ao,bo, 226a
• the first syringe plunger (122a) is coupled to a first end of the rotatable shaft (112)
• the second syringe plunger (122b) is coupled to a second end of the rotatable shaft (112)
• the rotatable shaft (112) extends through the motor (110) from the first syringe (120a) to the second syringe (120b).
• the rotatable shaft (112) rotates coaxially with the linear movement of at least one of the syringe plungers (122a,b).
• the dual syringe fluid pump (400) further comprises a coupler (412b) coupled to the rotatable shaft (412) wherein the rotatable shaft (412) is adapted to rotate the coupler (412b) to move the first syringe plunger (412a) to dispense fluid from the first syringe (420a) and move the second syringe plunger (422b) to aspirate fluid into the second syringe (420b).
• a coupler (412b) coupled to the rotatable shaft (412) wherein the rotatable shaft (412) is adapted to rotate the coupler (412b) to move the first syringe plunger (412a) to dispense fluid from the first syringe (420a) and move the second syringe plunger (422b) to aspirate fluid into the second syringe (420b).
• a method of forming a dual syringe fluid pump comprises forming a motor (110, 210, 310, 410) with a rotatable shaft (112, 212, 312, 412), forming a first syringe (120a, 220a, 320a, 420a) with a first syringe plunger (122a, 222a, 322a, 422a) and coupling the first syringe plunger (122a, 222a, 322a, 422a) to the rotatable shaft (112, 212, 312, 412), forming a second syringe (120b, 220b) with a second syringe plunger (122b, 222b, 322b, 422b) and coupling the second syringe plunger (122b, 222b, 322b, 422b) to the rotatable shaft (112, 212, 312, 412), forming a second syringe (120
• the forming the at least one of the syringes (120a,b) further comprises forming a barrel (124a) with a center bore (124cb) having a profile that prevents rotation of the at least one of the syringe plungers (122a,b) to convert the rotation of the rotatable shaft (112) to the linear movement of the at least one of the syringe plungers (122a,b).
• the forming the at least one of the syringes (120a,b) further comprises forming a barrel (124a) with a center bore (124cb) having a profile that prevents rotation of the at least one of the syringe plungers (122a,b) to convert the rotation of the rotatable shaft (112) to the linear movement of the at least one of the syringe plungers (122a,b).
• the method of forming the dual syringe fluid pump (200) further comprises forming a constraint (252), forming an aperture (225) in the syringe plunger (222a), coupling the constraint (252) to the motor (210), and slidably coupling the constraint (252) to the aperture (225) to prevent a rotation of the at least one of the syringe plungers (222a,b) such that rotation of the rotatable shaft (212) is converted to the linear movement of at least one of the syringe plungers (222a,b).
• the method of forming the dual syringe fluid pump further comprises adapting the motor (110, 210, 310, 410) to simultaneously move the first syringe plunger (122a, 222a, 322a, 422a) and the second syringe plunger (122b, 222b, 322b, 422b) to aspirate fluid into the first syringe (120a, 220a, 320a, 420a) and dispense fluid from the second syringe (120b, 220b, 320b, 420b).
• the motor 110, 210, 310, 410) to simultaneously move the first syringe plunger (122a, 222a, 322a, 422a) and the second syringe plunger (122b, 222b, 322b, 422b) to aspirate fluid into the first syringe (120a, 220a, 320a, 420a) and dispense fluid from the second syringe (
• the forming the at least one of the syringes further comprises forming and adapting a first valve (126ai,bi, 226ai,bi,
• 326ai,bi, 426ai,bi) to allow fluid to flow into the at least one of the syringes (120a,b, 220a,b, 320a,b, 420a,b) and forming and adapting an second valve (126ao,bo, 226ao,bo, 326ao,bo, 426ao,bo) to allow fluid to flow out of the at least one of the syringes (120a,b, 220a,b, 320a,b, 420a,b).
• the method of forming the dual syringe fluid pump (100, 200, 300) further comprises coupling the first syringe plunger (122a, 222a, 322a) to a first end of the rotatable shaft (112, 212, 312), coupling the second syringe plunger (122b, 222b, 322b) to a second end of the rotatable shaft (112, 212, 312), and extending the rotatable shaft (112, 212, 312) through the motor (110, 210, 310) from the first syringe (120a, 220a, 320a) to the second syringe (120b, 220b, 320b).
• the method of forming the dual syringe fluid pump (100, 200, 300, 400) further comprises adapting the rotatable shaft (112, 212, 312, 412) to rotate coaxially with the linear movement of at least one of the syringe plungers (122a,b, 222a,b, 322b, 422b).
• the method of forming the dual syringe fluid pump (400) further comprises forming and coupling a coupler (412b) to the rotatable shaft (412), and adapting the rotatable shaft (412) to rotate the coupler (412b) to move the first syringe plunger (422a) to dispense fluid from the first syringe (420a) and move the second syringe plunger (422b) to aspirate fluid into the second syringe (420b).
• the method of forming the dual syringe fluid pump (100, 200, 300, 400) further comprises selecting a motor (110, 210, 310, 410) rotation to a syringe plunger (122a,b, 222a,b, 322a,b, 422a,b) displacement ratio.
• a method of using a dual syringe fluid pump comprises providing a dual syringe fluid pump (100, 200, 300, 400) comprised of a motor (110, 210, 310, 410) with a rotatable shaft (112, 212, 312, 412), a first syringe (120a, 220a, 320a, 420a) with a first syringe plunger (122a, 222a, 322a, 422a) coupled to the rotatable shaft (112, 212, 312, 412), and a second syringe (120b, 220b, 320b, 420b) with a second syringe plunger (122b, 222b, 322b, 422b) coupled to the rotatable shaft (112, 212, 312, 412), providing fluid from a fluid source (370, 470) to the first syringe (120a, 220a, 320a
• the method of using the dual syringe fluid pump (100, 200, 300, 400) further comprises rotating the rotatable shaft (112, 212, 312, 412) to aspirate fluid into the first syringe (120a, 220a, 320a, 420a) from the fluid source (370, 470) while simultaneously dispensing fluid from the second syringe (120a, 220b, 320b, 420b).
• the method of using the dual syringe fluid pump (100, 200, 300, 400) further comprises dispensing fluid from the first syringe (120a, 220a, 320a, 420a) and the second syringe (120b, 220b, 320b, 420b) to a fluid supply conduit (390, 490) in a substantially continuous fluid flow.
• FIG. 1 shows a perspective view of a dual syringe fluid pump 100 according to an embodiment.
• FIG. 2 shows a plan end view of the dual syringe fluid pump 100 taken at section 2-2 shown in FIG. 1.
• FIG. 3 shows another perspective view of the dual syringe fluid pump 100.
• FIGS. 4a and 4b show transparent plan views of the barrel 124.
• FIGS. 5a -5c show plan and perspective views of the syringe plunger 122.
• FIG. 6 shows a perspective view of a dual syringe fluid pump 200 according to another embodiment.
• FIG. 7 shows a detailed perspective view of the dual syringe fluid pump 200.
• FIGS. 8a and 8b show schematic views of a dual syringe fluid pump 300 according to another embodiment.
• FIG. 9 shows a side plan view of a dual syringe fluid pump 400 according to an embodiment.
• FIGS. 10a and 10b show schematic representations of the dual syringe fluid pump 400 according to an embodiment.
• FIGS. 1 - 10b and the following description depict specific examples to teach those skilled in the art how to make and use the best mode of embodiments of a dual syringe fluid pump.
• FIGS. 1 - 10b and the following description depict specific examples to teach those skilled in the art how to make and use the best mode of embodiments of a dual syringe fluid pump.
• some of the following description depict specific examples to teach those skilled in the art how to make and use the best mode of embodiments of a dual syringe fluid pump.
• FIG. 1 shows a perspective view of a dual syringe fluid pump 100 according to an embodiment.
• the dual syringe fluid pump 100 includes a motor 110 that is coupled to a first syringe 120a and a second syringe 120b.
• the first syringe 120a is shown in a transparent view for clarity.
• the syringes 120a,b include syringe plungers 122a,b (the first syringe plunger 122a is shown).
• the syringes 120a,b also include barrels 124a,b that encloses the syringe plungers 122a,b.
• the barrels 124a,b include a center bore 124cb.
• Inlet 126ai,bi and outlet valves 126ao,bo are coupled to the barrels 124a,b.
• the first inlet valve 126ai is not shown in FIG. 1 for clarity.
• the outlet valves 126ao,bo allow fluid in the dual syringe fluid pump 100 to be dispensed by the syringes 120a,b.
• the inlet valves 126ai,bi allow fluids to be aspirated into the syringes 120a,b, as will be described in more detail in the following.
• FIG. 2 shows a plan end view of the dual syringe fluid pump 100 taken at section 2-2 shown in FIG. 1.
• the syringe plungers 122a,b have profiles that interface with profiles in the barrels 124a,b.
• the interfaced profile is shown as oval shaped with flat sides.
• the interfaced profiles prevent the rotation of the syringe plungers 122a,b. Preventing the plungers 122a,b from rotating can convert the motor 110 rotation to a linear displacement of the syringe plungers 122a,b.
• the motor 110 can also be adapted to simultaneously move the syringe plungers 122a,b, as will be described in more detail in the following.
• FIG. 3 shows another perspective view of the dual syringe fluid pump 100.
• the first syringe 120a is shown with an exploded perspective view for clarity.
• the motor 110 includes a rotatable shaft 112.
• the rotatable shaft 112 is coupled to the syringe plungers 122a,b.
• the first syringe plunger 122a has two O-rings 123.
• Between the motor 110 and the first syringe 120a are pins 140.
• the pins 140 align and couple the motor 110 with the collars 130a,b.
• a set screw 132 is employed to couple the collars 130a,b with the syringe barrels 124a,b although any suitable fastening means can be employed.
• the collars 130a,b also couple the syringes 120a,b to the motor 110.
• the rotatable shaft 112 is shown as a through axis shaft that extends through the center of the motor 110.
• more than one shaft can be employed (e.g., with a coupling or the like).
• the shaft 112 can also be located somewhere other than the center of the motor 110.
• the syringe plungers 122a,b are coupled to a first and second distal ends of the rotatable shaft 112.
• the motor 110 is adapted to rotate the rotatable shaft 112 to simultaneously move the syringe plungers 122a,b.
• the motor 1 10 can therefore simultaneously dispense fluid from the first syringe 120a and aspirate fluid into the second syringe 120b.
• the rotation can also cause a torque on the plunger 122a that, if not prevented, could cause the plunger 122a to rotate.
• the following discusses how the plunger 122a,b is prevented from rotating.
• FIGS. 4a and 4b show transparent plan views of the barrel 124.
• FIG. 4a shows a side plan view of the barrel 124 and
• FIG. 4b shows an end plan view of the barrel 124.
• the barrel 124 is shown as having a slot 124ss that is adapted to receive the set screw 132.
• the center bore 124cb is coupled to the inlet bore 124ib and the outlet bore 124ob via an inlet tap 124it and an outlet tap 124ot.
• the center bore 124cb has a shaped profile. This shaped profile can interface with the syringe plunger 122.
• FIGS. 5a -5c show plan and perspective views of the syringe plunger 122.
• the syringe plunger 122 includes a face rib 122fr, a center rib 122cr, and a rear rib 122rr.
• the syringe plunger 122 also includes two O-ring slots 122sl,s2. Although two O-ring slots 122sl,s2 are shown, more or fewer O-ring slots may be employed in alternative embodiments.
• the O-ring slots 122sl,s2 are adapted to receive and hold the O-rings 123 described with reference to FIG. 3.
• the plunger 122a has a shaped profile.
• the center bore 124cb profile can interface with the syringe plunger 122' s profile.
• the interfaced profiles are shown as oval shaped with flat sides although other appropriately shaped profiles can be employed.
• the interfaced profiles provide a fluid seal that can prevent leakage of fluid past the O-rings 123 shown in FIG. 3. This allows the fluid dispensed from and aspirated into the syringes 120 to be precise, accurate, and repeatable. For example, if the fluid leakage past the O-rings 123 is prevented, the volume of fluid dispensed may not vary between each dispensing due to leakage. The volume of the fluid dispensed can therefore be more precise.
• the interfaced profiles also prevent the plunger 122a,b from rotating when the motor 110 rotates the rotatable shaft 112.
• the rotatable shaft 112 can rotate to move the plunger 112a away from the motor 110. Friction between the rotatable shaft 112 and the plunger 112a can therefore apply a torque to the plunger 112a.
• the interfaced profiles apply reactive forces to the plunger 112a that counter the torque. The reactive forces prevent the plunger 112a from rotating. Similar results can be obtained from other profiles shapes such as square shaped profiles with rounded corners or the like.
• other embodiments can employ constraints to prevent the plunger from rotating, which are described in the following with reference to FIGS. 6 and 7.
• FIG. 6 shows a perspective view of a dual syringe fluid pump 200 according to another embodiment.
• the dual syringe fluid pump 200 is shown with an exploded view of the first syringe 220a.
• the dual syringe fluid pump 200 similar to the dual syringe fluid pump 100, includes a motor 210 that is coupled to a first syringe 220a and a second syringe 220b.
• a collar 250 is between the motor 210 and the first syringe 220a.
• the syringes 220a,b includes syringe plungers 222a,b slidably disposed inside barrels 224a,b (only the first syringe plunger 222a is shown).
• the syringe plunger 222a has a circular shape. O-rings 223 are disposed around the syringe plunger 222a.
• the barrel 224a has a center bore 224cb, an outlet bore 226ao, an inlet bore 226ai.
• the center bore 224cb is coupled to the inlet valve 226ai and the outlet valve 226ao.
• the syringe 220 also includes a nut 225 that is coupled to syringe plunger 222a.
• the barrel 224a also includes a nut bore 227.
• the nut 225 is adapted to fit into the nut bore 227.
• the nut 225 also has apertures 225' that are slidably coupled to constraints 252. Although two apertures 225' and constraints 252 are shown, more or fewer may be employed in alternative embodiments.
• FIG. 7 shows a detailed transparent perspective view of the dual syringe fluid pump 200.
• the motor 210 and the first syringe 220a are shown in a transparent assembled view without the second syringe 220b.
• the syringe plunger 222a is slidably disposed in the center bore 224cb.
• the center bore 124cb is coupled to the inlet bore 124ib and the outlet bore 124ob via an inlet tap 124it and an outlet tap 124ot.
• the constraints 252 are coupled to the barrel 224a.
• the nut 225 is slidably disposed inside the nut bore 227.
• the nut 225 can move linearly along the length of the constraints 252.
• the constraints 252 prevent the rotation of the syringe plunger 222a.
• the constraints 252 oppose a rotational torque on the syringe plunger 222a. This can prevent the rotation of the syringe plunger 222a thereby converting the rotation of the rotatable shaft 212 to a linear movement and displacement of the syringe plunger 222a within the center bore 224cb.
• the syringe plunger 222a can have a profile (e.g. , circular) that does not prevent the rotation of the syringe plunger 222a.
• the motor 110, 210 is a direct drive motor although any suitable motor, such as a stepper motor, can be employed.
• the motor 110, 210 can also include an encoder that detects the rotation position of the motor 110, 210.
• the motor 110, 210 is adapted to simultaneously move the syringe plungers 122a,b , 222a,b in the barrels 124a,b, 224a,b.
• the motor 110, 210 is disposed between and coupled to the syringes 120a,b, 220a,b.
• the motor can be coupled to syringes in different configurations or locations.
• the motor 110, 210 is adapted to receive a command from a controller (see FIGS. 8a-8b) that instructs the motor 110, 210 to rotate the rotatable shaft 112, 212 a desired amount.
• the desired amount can be in units of radians, steps, or the like.
• the encoder in the motor 110, 210 can also send information to the controller.
• the desired rotation can correspond with the amount of fluid that is dispensed from and aspirated into the syringes 120a,b, 220a,b.
• the motor 110, 210 is adapted to rotate the rotatable shaft 112, 212 to
• the motor 110, 210 can therefore simultaneously dispense fluid from the first syringe 120a, 220a and aspirate fluid into the second syringe 120b, 220b.
• the motor 110, 210 rotates the rotatable shaft 112, 212 which moves the first syringe plunger 122a, 222a away from the motor 110, 210.
• the rotation also moves the second syringe plunger 122b, 222b towards the motor 110, 210.
• fluid is dispensed from the first syringe 120a, 220a via the first outlet valve 126ao, 226ao and aspirated into the second syringe 120b, 220b via the second inlet valve 126bi, 226bi.
• Rotating the shaft 112, 212 in the opposite direction causes fluid to be aspirated into the first syringe 120a, 220a and fluid to be dispensed from the second syringe 120b, 220b.
• the rotatable shaft 112, 212 is a lead screw adapted to linearly move the syringe plungers 122a,b, 222a,b according to a rotation-to-displacement ratio. That is, each unit of rotation of the rotatable shaft 112, 212 corresponds to a displacement of the plungers 122a,b, 222a,b.
• the rotatable shaft 112, 212 is a lead screw shaft with threads, any appropriate means of converting the shaft 112, 212 rotation to a linear movement and displacement of the syringe plungers 122, 222 can be employed.
• the rotatable shaft 112, 212 is comprised of screw threads with a selected rotation-to-displacement ratio, which can be expressed as number of threads per unit length. Therefore, when the motor 110, 210 receives a command from a controller (see FIGS. 8a-8b) to rotate a desired amount, the rotatable shaft 112, 212 is adapted to move the syringe plungers 122, 222 a desired displacement length. In the embodiment shown, the rotatable shaft 112, 212 moves linearly along the center axis of the motor 110, 210 to move the plungers 122, 222.
• Converting the shaft 112, 212 rotation to a linear movement and displacement of the syringe plungers 122, 222 allows the motor 110, 210 to dispense from and aspirate fluid into the syringes 120, 220.
• the motor 110, 210 can also dispense fluid in a substantially continuous manner, as will be described in the following with reference to FIGS. 8a-8b.
• FIGS. 8a and 8b show a schematic view of a dual syringe fluid pump 300 according to another embodiment.
• the dual syringe fluid pump 300 is a schematic representation of the dual syringe fluid pumps 100, 200 described with reference to FIGS. 1 to 7.
• the syringes 320a,b represent the syringes 120,220 described with reference to FIGS. 1 to 7. Accordingly, description of features shown in FIGS. 8a- 8b can correspond to features described with reference to FIGS. 1-7.
• the dual syringe fluid pump 300 can also be a schematic representation of other embodiments.
• the dual syringe fluid pump 300 includes a motor 310 that is coupled to a first syringe 320a and a second syringe 320b.
• the motor 310 is adapted to dispense fluid from and aspirate fluid into the syringes 320a,b.
• a controller 360 that is electrically coupled to the motor 310 and the syringes 320 via signal lines 362a,b.
• the signal lines 362a,b are adapted to carry signals between the controller 360 and syringes 320a,b which can have sensors 320as,bs.
• a fluid source 370 and a fluid supply conduit 390 is also shown.
• the fluid source 360 is fluidly coupled to the syringes 320a,b.
• the fluid supply conduit 390 is a conduit that can be coupled to equipment that uses fluid dispensed by the fluid pump 300.
• FIGS. 8a and 8b Arrows indicating movement are also shown in FIGS. 8a and 8b.
• the direction of the plunger 322a,b displacement is represented by an arrow in the motor 310.
• the direction of the fluid flow dispensed from and aspirated into the syringes 320a,b is shown by arrows proximate the valves 326.
• the arrow proximate the first syringe outlet valve 326ao indicates that the fluid is being dispensed from the first syringe 320a.
• the arrow proximate the second syringe inlet valve 326bi shown in FIG. 8a indicates that fluid is being aspirated into the second syringe 320b.
• the arrow in the motor 310 in FIG. 8a indicates that the syringe plunger 322a in the first syringe 320a is moving away from the motor 310.
• the syringe plunger 322b is moving
• the displacement direction of the syringe plungers 322a,b shown in FIG. 8a dispenses fluid from the first syringe 320a via the outlet valve 326ao. This displacement also aspirates fluid into the second syringe 320b via the inlet valve 326bi.
• the first syringe inlet valve 326ai and the second syringe outlet valve 326bo are closed due to the pressure in the syringes 320a,b.
• a relatively low pressure in the second syringe 320b prevents the second outlet valve 320bo from opening.
• a relatively high pressure in the first syringe 320a prevents the first inlet valve from opening.
• the dual syringe fluid pumps 100-300 described with reference to FIGS. l-8b have rotatable shafts 112-312 in a through axis configuration.
• the through axis configuration allows the motor 110-310 to simultaneously move the first syringe plunger 120a-320a and the second syringe plunger 120b-320b.
• other embodiments of the dual syringe fluid pump can simultaneously move the syringe plungers 122a,b-322a,b without using the through axis configuration, as will be described in the following with reference to FIGS. 9- 10b.
• FIG. 9 shows a side plan view of a dual syringe fluid pump 400 according to an embodiment.
• the motor 410 is disposed on one side of the dual syringe fluid pump 400.
• the syringes 420a,b are arranged in a parallel configuration.
• the syringes 420a,b have syringe plungers 422a,b.
• the dual syringe fluid pump 400 can have inlet and outlet valves 426.
• the first syringe 420a has an inlet valve 426ai and an outlet valve 426ao.
• the second syringe 420b has an inlet valve 426bi and an outlet valve 426bi.
• the motor 410 has a rotatable shaft 412.
• the rotatable shaft 412 is shown with an encoder 412a.
• the rotatable shaft 412 is coupled to the syringe plungers 422a,b via a coupler 412b.
• the coupler 412b is a worm gear coupler although other couplers can be employed in alternative embodiments.
• the syringe plungers 422a,b have grooved portions 422at,bt (e.g., cam locks or the like) that are coupled to the coupler 412b.
• the plungers 422a,b in the syringes 420a,b have parallel stroke axes.
• the stroke axes can be oriented in different directions.
• the syringe plungers 422a,b move away from the motor 410 to dispense fluids from the first syringe 420a.
• the syringe plungers 422a,b move towards the motor 410 to aspirate fluid into the plungers 420a,b.
• the motor 410 can move the syringe plungers 422a,b to dispense fluid from and aspirate fluid into the syringes 420a,b.
• the motor 410 rotates the coupler 412b to move the syringe plungers 422a,b in opposite directions.
• the rotating coupler 412b is engaged with the grooved portions 412at,bt.
• the grooved portions 412at,bt have grooves with opposing orientations.
• the first grooved portion 412at can have left hand twisted grooves.
• the second thread portion 412bt can have right hand twisted grooves.
• the opposing orientations of the grooves causes the plungers 422a,b to move in opposite directions.
• the first plunger 422a can move away from the motor 410 while the second plunger 422b simultaneously moves toward the motor 410.
• the motor 410 reverses the rotation of the rotatable shaft 412.
• the motor 410 can therefore rotate the rotatable shaft 412 to simultaneously move the syringe plungers 422a,b.
• the rotation of the rotatable shaft 412 can be detected by the encoder 412a.
• the encoder 412a is a position sensor that detects the rotation position of the rotatable shaft 412.
• the encoder 412 generates a signal (e.g., electrical) that is communicated to a controller (described with reference to FIGS. 10a- 10b).
• the controller can precisely and accurately dispense fluid from the dual syringe fluid pump 410, as will be discussed in more detail in the following.
• FIGS. 10a and 10b show schematic representations of the dual syringe fluid pump 400 according to an embodiment.
• the dual syringe fluid pump 400 includes the motor 410 which is coupled to the syringes 420a,b.
• the syringe plungers 422a,b are in the syringes 420a,b.
• the rotation direction of the rotatable shaft 412 is indicated by an arrow in shown in the motor 410.
• the arrow in FIG. 10a indicates indicates that the rotatable shaft 412 is rotating in a direction with an axis oriented, using the right hand rule, towards the syringe plungers 420a,b.
• the arrow in FIG. 10b indicates the rotatable shaft 412 is rotating in an opposite direction.
• the direction of the fluid flow dispensed from and aspirated into the syringes 420a,b is shown by arrows proximate the valves 426.
• the arrow proximate the first syringe outlet valve 426ao indicates that the fluid is dispensed from the first syringe 420a.
• the arrow proximate the second syringe inlet valve 426bi shown in FIG. 10a indicates that fluid is being aspirated into the second syringe 420b.
• FIG. 10a shows that the syringe plungers 122a,b, 222a,b dispenses fluid from the first syringe 420a via the outlet valve 426ao and aspirates fluid into the second syringe 420b via the inlet valve 426bi.
• the first syringe inlet valve 426ai and the second syringe outlet valve 426bo are shown as closed due to the fluid pressure in the syringes 420a,b.
• the syringe plungers 422a,b are shown as moving in directions opposite the directions shown in FIG. 10a.
• the dual syringe fluid pump 100-400 dispenses fluid from the first syringe 120a-420a and the second syringe 120b-420b.
• the fluid can be supplied to the syringes 120a,b-420a,b by the fluid source 370, 470 described with reference to FIGS. 8a-10b.
• the motor 110-410 can rotate the rotatable shaft 112-412 to dispense fluid from the first syringe 120a-420a while simultaneously aspirating fluid from the fluid source 370, 470 into the second syringe 120-420b.
• the motor 110-410 can also rotate the rotatable shaft 112-412 to aspirate fluid into the first syringe 120a-420a from the fluid source 370, 470 while simultaneously dispensing fluid from the second syringe 120b- 420b.
• the fluid being dispensed from one of the syringes 120a,b-420a,b while the other is aspirating fluid, flows from the fluid supply port 390, 490 in a substantially continuous manner.
• one of the syringe plungers 122a,b-422a,b is dispensing fluid to the fluid supply conduit 390, 490.
• the syringes 120-420 also do not dispense fluid at the same time.
• the syringe plungers 122a,b-322a,b described with reference to FIGS. 1-9 are coupled to distal ends of the shaft 112, 212.
• the motor 110- 310 can therefore move the syringe plungers 122a,b-322a,b in opposite directions.
• the motor 410 described with reference to FIGS. 9- 10b is coupled to the syringe plungers 422a,b via a coupler 412b that can simultaneously move the syringe plungers 422a,b in opposite directions. Since the first syringe plunger 122a-422a and the second syringe plunger 122b-422b move in opposite directions, the fluid is not dispensed from the first syringe 120a-420a at the same time as the second syringe 120b- 420b.
• the embodiments described above provide a dual syringe fluid pump 100-400.
• the dual syringe fluid pump 100-400 can simultaneously move syringe plungers 122a,b-422a,b to dispense fluids from a first syringe 120a-420a and aspirate fluid into a second syringe 120b-420b.
• This simultaneous movement reduces the complexity of the dual syringe fluid pump 100-400 over prior art dual syringe fluid pumps.
• having two syringes 120a,b-420a,b allows for the fluids to be dispensed precisely and accurately as well as continuously.
• the displacement length of the syringe plungers 120a,b-420a,b can, for example, be controlled by sensors 320as,bs that detect when the syringe plungers 120a,b-420a,b have moved to their fully dispensed or aspirated positions. This allows the displacement length of the syringe plungers 122a,b-422a,b to be controlled so desired amounts of fluids can be dispensed.
• the dual syringe fluid pump 100-400 is less complex than prior art fluid pump designs, the precision and accuracy of the amount of fluid dispensed by the dual syringe fluid pump 100-400 is repeatable over a large number of cycles.
• the design of the dual syringe fluid pump 100 described with reference to FIGS. l-5c is even less complex by providing an interfaced profile that is adapted to prevent the rotation of the syringe plunger 122a,b.
• the interfaced profile can eliminate the need for additional or alternative constraints 252 that also limit the rotation of the syringe plungers 222a,b described with reference to FIGS. 6-7.
• the constraints 252 or the shaped profile plungers 122a,b may be preferred.
• the dual syringe fluid pump 100-400 is also compact.
• the dual syringe fluid pump 100-300 with the through axis configuration can have a narrow profile.
• the through axis configuration can also have a profile more narrow than the dual syringe fluid pump 400 having the side motor 410 configuration.
• the dual syringe fluid pump 400, with the motor 410 on one side can fit into a cube shaped envelope.
• the preferred configuration can depend on the available envelope in which the dual syringe fluid pump 100-400 is employed.

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• 2013
  • 2013-12-02 EP EP13811689.2A patent/EP3077021A1/en not_active Withdrawn
  • 2013-12-02 CN CN201380082006.1A patent/CN105939738A/zh active Pending
  • 2013-12-02 US US15/038,815 patent/US20170021951A1/en not_active Abandoned
  • 2013-12-02 WO PCT/US2013/072610 patent/WO2015084302A1/en active Application Filing

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