CA2459405A1 - Electronic control system and process for electromagnetic pump - Google Patents

Electronic control system and process for electromagnetic pump Download PDF

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Publication number
CA2459405A1
CA2459405A1 CA002459405A CA2459405A CA2459405A1 CA 2459405 A1 CA2459405 A1 CA 2459405A1 CA 002459405 A CA002459405 A CA 002459405A CA 2459405 A CA2459405 A CA 2459405A CA 2459405 A1 CA2459405 A1 CA 2459405A1
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CA
Canada
Prior art keywords
coil
pump
power
capacitor
recited
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002459405A
Other languages
French (fr)
Other versions
CA2459405C (en
Inventor
John F. Gray
Robert W. Bosley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Medtronic Minimed Inc
Original Assignee
Medtronic Minimed, Inc.
John F. Gray
Robert W. Bosley
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Medtronic Minimed, Inc., John F. Gray, Robert W. Bosley filed Critical Medtronic Minimed, Inc.
Publication of CA2459405A1 publication Critical patent/CA2459405A1/en
Application granted granted Critical
Publication of CA2459405C publication Critical patent/CA2459405C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • 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
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M5/14276—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body specially adapted for implantation
    • 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
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • H02K33/10—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the alternate energisation and de-energisation of the single coil system is effected or controlled by movement of the armatures

Abstract

An electronic control systems and process for infusion devices and pump configurations can provide highly efficient use of electrical power. The system may include a capacitor (28), which is controlled to partially, but not fully discharge, to provide a power pulse to a pump coil (24). A power cut-off switch (40) may be provided to control the discharge of the capacitor such that the capacitor (28) is stopped from discharging prior to the actual end of the armature stroke. The time at which the capacitor discharge is stopped may be selected such that energy remaining in the coil (24) after the capacitor (28) stops discharging is sufficient to continue the pump stroke to the actual end of the stroke. A power disconnect switch (41) may be provided between the capacitor (28) and the battery (26), to allow the capacitor (28) to be electrically disconnected from the battery (26) during storage or other periods of non-use.

Claims (53)

1. An electronic control system for use with an electromagnetic pump having a coil that can be energized to produce a pump stroke, the electronic control system comprising: a power source; a capacitor connected to the power source for receiving a charge from the power source and connectable to the coil to selectively discharge power pulse signals to the pump coil for selectively energizing the pump coil; control electronics for controlling the capacitor to discharge partially, but not fully, for each power pulse signal.
2. An electronic control system as recited in claim 1, wherein the control electronics comprises a switch device connected on one side to the capacitor and connectable on the other side to the coil, and control signal electronics for providing a control signal to the switch device for selectively opening and closing the switch.
3. An electronic control system as recited in claim 2, wherein the switch device comprises a field effect transistor (FET).
4. An electronic control system as recited in claim 1, wherein the control electronics cuts off the capacitor discharge prior to the end of the pump stroke.
5. An electronic control system as recited in claim 1, wherein the control electronics comprises a detector for detecting the end of a pump stroke and an electronic circuit for cutting off the capacitor discharge prior to the detected end of the pump stroke.
6. An electronic control system as recited in claim 5, wherein the detector for detecting the end of a pump stroke comprises an electronic circuit for detecting the (EMF) in the coil.
7. An electronic control system as recited in claim 1, wherein the control electronics comprises a pressure sensor for detecting a pressure differential in the pump and means for controlling the capacitor discharge based on the detected pressure differential.
8. An electronic control system as recited in claim 7, wherein said means controls the capacitor discharge to produce a power pulse delivering more power as the detected pressure differential increases and less power as the detected pressure differential decreases.
9. An electronic control system as recited in claim 1, wherein the power source comprises a depletable power source.
10. An electronic control system as recited in claim 1, wherein the power source comprises a battery.
11. An electronic control system as recited in claim 1, wherein the value of the capacitor is between about 500 micro Farad and about 3000 micro Farad.
12. An electronic control system as recited in claim 1, wherein the value of the capacitor is about 2000 micro Farad.
13. An electronic control system as recited in claim 1, wherein the voltage across the capacitor after a partial discharge to produce a power pulse is in the range of about 40% to about 90% of the voltage across the capacitor prior to the partial discharge.
14. An electronic control system as recited in claim 1, wherein the power source charges the capacitor to a fully charged state in which the voltage across the capacitor is in the range of about 1.8 volts to about 5.0 volts.
15. An electronic control system for use with an electromagnetic pump having a coil that can be energized to produce a pump stroke, the electronic control system comprising: a power control circuit connectable to the pump coil for providing electrical power to the pump coil to selectively energize the pump coil; and a detector for detecting the end of a pump stroke; wherein the power control circuit includes an electronic circuit for cutting off electrical power to the pump coil prior to the detected end of the pump stroke.
16. An electronic control system as recited in claim 15, wherein the power control circuit comprises a power source and a capacitor connected to the power source for receiving a charge from the power source and connectable to the coil to selectively discharge power pulse signals to the pump coil.
17. An electronic control system as recited in claim 15, wherein the power control circuit comprises a power source and a capacitor connected to the power source for receiving a charge from the power source and connectable to the coil to selectively discharge power pulse signals to the pump coil and wherein the electronic circuit for cutting off electrical power comprises a switch device connected on one side to the capacitor and connectable on the other side to the coil, and control signal electronics for providing a control signal to the switch device for selectively opening and closing the switch.
18. An electronic control system as recited in claim 17, wherein the electronic circuit for cutting off electrical power includes means for controlling the capacitor to discharge partially, but not fully, for each power pulse signal.
19. An electronic control system as recited in claim 15, wherein the detector for detecting the end of a pump stroke comprises an electronic circuit for detecting the back EMF in the coil.
20. An electronic control system as recited in claim 19, wherein the power control circuit includes means for comparing a detected back EMF
with an historical record of back EMF detections.
21. An electronic control system for use with an electromagnetic pump having a coil that can be energized to produce a pump stroke, the electronic control system comprising: a power control circuit connectable to the pump coil for providing electrical power pulse signals to the pump coil to selectively energize the pump coil, each power pulse signal having a definable amount of power; and a pressure sensor for detecting a pressure differential in the pump; wherein the power control circuit includes an electronic circuit for controlling the amount of power of each power pulse signal based on the detected pressure differential.
22. An electronic control system as recited in claim 21, wherein the power control circuit comprises a power source and a capacitor connected to the power source for receiving a charge from the power source and connectable to the coil to selectively discharge power pulse signals to the pump coil.
23. An electronic control system as recited in claim 22, wherein the electronic circuit for controlling the amount of power includes means for controlling the capacitor to increase the discharge period for each power pulse signal as the detected pressure differential increases and to decrease the discharge period for each pulse signal as the detected pressure differential decreases.
24. An electronic control system as recited in claim 21, wherein the power control circuit comprises a power source and a capacitor connected to the power source for receiving a charge from the power source and connectable to the coil to selectively discharge power pulse signals to the pump coil and wherein the electronic circuit for controlling the amount of power comprises a switch device connected on one side to the capacitor and connectable on the other side to the coil, and control signal electronics for providing a control signal to the switch device for selectively opening and closing the switch based on the detected pressure differential.
25. An electronic control system as recited in claim 21, wherein the electronic circuit for controlling the amount of power includes means for controlling the capacitor to discharge partially, but not fully, for each power pulse signal.
26. An electronic control system as recited in claim 21, wherein the power control circuit produce a power pulse delivering more power as the detected pressure differential increases and less power as the detected pressure differential decreases.
27. An electronic control system for use with an electromagnetic pump having a coil that can be energized to produce a pump stroke, the electronic control system comprising: a power source; a capacitor connected to the power source for receiving a charge from the power source and connectable to the coil to selectively discharge power pulse signals to the pump coil for selectively energizing the pump coil; a switch device connected between the power source and the capacitor for selectively disconnecting the power source from the capacitor for periods of non-use.
28. An electronic control system as recited in claim 27, wherein the switch device comprises a switch capable of remaining in a disconnect state in which the capacitor is disconnected from the power source, without the continuous application of electrical power to the switch device.
29. An electronic control system as recited in claim 27, wherein the switch device comprises a manually operable switch.
30. A drive mechanism for delivery of infusion medium comprising: an inlet for receiving infusion medium; a coil that can be energized to produce a pump stroke; an armature disposed adjacent the coil, and moveable between first and second positions to define a pump stroke, in response to an energization of the coil; an outlet in flow communication with the outlet chamber, for discharging a volume of infusion medium with each pump stroke; and a power control circuit connected to the pump coil for selectively energizing the pump coil to produce a pump stroke; wherein the coil has an aspect ratio defined by the length of the coil divided by the diameter of the coil and wherein the coil aspect ration is less than 1.
31. A drive mechanism for delivery of infusion medium comprising: an inlet for receiving infusion medium; a coil that can be energized to produce a pump stroke; an armature disposed adjacent the coil, and moveable between first and second positions to define a pump stroke, in response to an energization of the coil; an outlet in flow communication with the outlet chamber, for discharging a volume of infusion medium with each pump stroke; and a power control circuit connected to the pump coil for selectively energizing the pump coil to produce a pump stroke; wherein the drive mechanism further comprises a coil core for providing a flux path upon energization of the coil, wherein the coil core defines an outer annular pole surface and an inner annular pole surface and the armature defines corresponding outer and inner annular pole surfaces, wherein the inner pole surfaces are separated by a first gap and the outer pole surfaces are separated by a second gap, and wherein the ratio of the first gap to the second gap is within the range of about 0.3 to about 1Ø
32. An infusion device comprising: an electromagnetic pump having a coil that can be energized to produce a pump stroke; a power source; a capacitor connected to the power source for receiving a charge from the power source and connected to the coil to selectively discharge power pulse signals to the pump coil for selectively energizing the pump coil; and control electronics for controlling the capacitor to discharge partially, but not fully, for each power pulse signal.
33. An infusion device comprising: an electromagnetic pump having a coil that can be energized to produce a pump stroke; a power control circuit connected to the pump coil for providing electrical power to the pump coil to selectively energize the pump coil; and a detector for detecting the end of a pump stroke; wherein the power control circuit includes an electronic circuit for cutting off electrical power to the pump coil prior to the detected end of the pump stroke.
34. An infusion device comprising: an electromagnetic pump having a coil that can be energized to produce a pump stroke; a power control circuit connected to the pump coil for providing electrical power pulse signals to the pump coil to selectively energize the pump coil, each power pulse signal having a definable amount of power; and a pressure sensor for detecting a pressure differential in the pump; wherein the power control circuit includes an electronic circuit for controlling the amount of power of each power pulse signal based on the detected pressure differential.
35. An infusion device comprising: an electromagnetic pump having a coil that can be energized to produce a pump stroke; a power source; a capacitor connected to the power source and to the pump coil for receiving a charge from the power source and for selectively discharging power pulse signals to the pump coil to selectively energize the pump coil; and a switch device connected between the power source and the capacitor for selectively disconnecting the power source from the capacitor for periods of non-use.
36. A method of controlling power to an electromagnetic pump having a coil that can be energized to produce a pump stroke, the method comprising: connecting a power source to a capacitor to charge the capacitor; selectively discharging the capacitor to the pump coil to selectively energize the pump coil; and controlling the capacitor to discharge partially, but not fully, for each power pulse signal.
37. A method as recited in claim 36, wherein controlling the capacitor comprises connecting a switch device between the capacitor and the coil, and providing a control signal to the switch device for selectively opening and closing the switch.
38. A method as recited in claim 37, wherein the switch device comprises a field effect transistor (FET).
39. A method as recited in claim 36, wherein controlling the capacitor comprises cutting off the capacitor discharge prior to the end of the pump stroke.
40. A method as recited in claim 36, further comprising: detecting the end of a pump stroke; and cutting off the capacitor discharge prior to the detected end of the pump stroke.
41. A method as recited in claim 40, wherein detecting the end of a pump stroke comprises detecting the back EMF in the coil.
42. A method as recited in claim 36, further comprising: detecting a pressure differential in the pump; and controlling the capacitor discharge based on the detected pressure differential.
43. A method as recited in claim 42, wherein controlling the capacitor discharge based on the detected pressure differential comprises controlling the capacitor discharge to produce a power pulse delivering more power as the detected pressure differential increases and less power as the detected pressure differential decreases.
44. A method of controlling power to an electromagnetic pump having a coil that can be energized to produce a pump stroke, the method comprising: providing electrical power to the pump coil to selectively energize the pump coil; detecting the end of a pump stroke; and cutting off electrical power to the pump coil prior to the detected end of the pump stroke.
45. A method as recited in claim 44, wherein providing electrical power comprises connecting a power source to a capacitor to charge the capacitor; and selectively discharging the capacitor to provide a power pulse signal to the pump coil to selectively energize the pump coil.
46. A method as recited in claim 45, wherein selectively discharging the capacitor comprises controlling the capacitor to discharge partially, but not fully, for each power pulse signal.
47. A method as recited in claim 44, wherein detecting the end of a pump stroke comprises detecting the back EMF in the coil.
48. A method as recited in claim 47, wherein detecting the end of a pump stroke further comprises comparing a detected EMF with an historical record of EMF detections.
49. A method of controlling power to an electromagnetic pump having a coil that can be energized to produce a pump stroke, the method comprising: providing electrical power pulse signals to the pump coil to selectively energize the pump coil, each power pulse signal having a definable amount of power; detecting a pressure differential in the pump; and controlling the amount of power of each power pulse signal based on the detected pressure differential.
50. A method as recited in claim 49, wherein providing electrical power pulse signals comprises; connecting a power source to a capacitor to charge the capacitor; and selectively discharging the capacitor to provide a power pulse signal to the pump coil to selectively energize the pump coil.
51. A method as recited in claim 50, wherein selectively discharging the capacitor comprises controlling the capacitor to increase its discharge period for each power pulse signal as the detected pressure differential increases and to decrease its discharge period for each pulse signal as the detected pressure differential decreases.
52. A method as recited in claim 50, wherein selectively discharging the capacitor comprises controlling the capacitor to discharge partially, but not fully, for each power pulse signal.
53. An electronic control system as recited in claim 49, wherein controlling the amount of power comprises producing a power pulse delivering more power as the detected pressure differential increases and less power as the detected pressure differential decreases.
CA2459405A 2001-09-07 2002-09-04 Electronic control system and process for electromagnetic pump Expired - Fee Related CA2459405C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US31812501P 2001-09-07 2001-09-07
US60/318,125 2001-09-07
US10/033,721 2001-12-27
US10/033,721 US6595756B2 (en) 2001-09-07 2001-12-27 Electronic control system and process for electromagnetic pump
PCT/US2002/028023 WO2003023226A1 (en) 2001-09-07 2002-09-04 Electronic control system and process for electromagnetic pump

Publications (2)

Publication Number Publication Date
CA2459405A1 true CA2459405A1 (en) 2003-03-20
CA2459405C CA2459405C (en) 2010-07-06

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CA2459405A Expired - Fee Related CA2459405C (en) 2001-09-07 2002-09-04 Electronic control system and process for electromagnetic pump

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US (1) US6595756B2 (en)
EP (1) EP1436508B1 (en)
JP (2) JP4162594B2 (en)
AT (1) ATE355462T1 (en)
CA (1) CA2459405C (en)
DE (1) DE60218504T2 (en)
WO (1) WO2003023226A1 (en)

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EP1436508B1 (en) 2007-02-28
US20030049135A1 (en) 2003-03-13

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