US20120083730A1 - Variable Volume, Shape Memory Actuated Insulin Dispensing Pump - Google Patents
Variable Volume, Shape Memory Actuated Insulin Dispensing Pump Download PDFInfo
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- US20120083730A1 US20120083730A1 US13/252,135 US201113252135A US2012083730A1 US 20120083730 A1 US20120083730 A1 US 20120083730A1 US 201113252135 A US201113252135 A US 201113252135A US 2012083730 A1 US2012083730 A1 US 2012083730A1
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- Prior art keywords
- pump
- piston
- plunger
- shape memory
- feedback
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Classifications
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- 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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
- F03G7/065—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like using a shape memory element
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- 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
-
- 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
-
- 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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
-
- 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
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- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
- G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/02—General characteristics of the apparatus characterised by a particular materials
- A61M2205/0266—Shape memory materials
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/02—General characteristics of the apparatus characterised by a particular materials
- A61M2205/0272—Electro-active or magneto-active materials
- A61M2205/0288—Electro-rheological or magneto-rheological materials
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3317—Electromagnetic, inductive or dielectric measuring means
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/70—General characteristics of the apparatus with testing or calibration facilities
- A61M2205/702—General characteristics of the apparatus with testing or calibration facilities automatically during use
-
- 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
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0201—Position of the piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/08—Shape memory
Abstract
A portable pumping system provides insulin or other drugs to a user. A shape memory element is used to actuate the pump and an intelligent system controls the actuator in order to minimize stresses within the system and provide accurate and reliable dosage delivery. The control system utilizes various types of feedback to monitor and optimize the position of the pumping mechanisms. Physical design aspects also minimize stress and the combination of the physical design aspects and the intelligent operation of the system results in a lightweight and cost effective pump that may be used in a disposable fashion if desired.
Description
- The present application is a continuation-in-part of U.S. application Ser. No. 10/683,659 of Benjamin M. Rush et al., filed on Oct. 9, 2003, which is related to and claims priority based on U.S. Provisional Application No. 60/417,464, entitled “Disposable Pump for Drug Delivery System,” filed on Oct. 9, 2002, and U.S. Provisional Application No. 60/424,613, entitled “Disposable Pump and Actuation Circuit for Drug Delivery System,” filed on Nov. 6, 2002, each of which is hereby incorporated by this reference in its entirety. The parent application, U.S. application Ser. No. 10/683,659, was published as U.S. Patent Application Publication No. 2004/0115067 A1. The present application is related to U.S. application Ser. No. ______, of Benjamin M. Rush, entitled “Fluid Delivery Device with Auto Calibration,” and U.S. application Ser. No. ______ of Benjamin M. Rush, entitled “Devices And Methods For Use in Assessing a Flow Condition of a Fluid,” each of which is filed concurrently with the present application and is hereby incorporated herein, in its entirety, by this reference.
- The present invention is generally related to portable insulin or other liquid delivery systems and more specifically related to a pump for use in such systems.
- Insulin pumps are widely available and are used by diabetic people to automatically deliver insulin over extended periods of time. Many currently available insulin pumps employ a common pumping technology, the syringe pump. In a syringe pump, the plunger of the syringe is advanced by a lead screw that is turned by a precision stepper motor. As the plunger advances, fluid is forced out of the syringe, through a catheter to the patient. The choice of the syringe pump as a pumping technology for insulin pumps is motivated by its ability to precisely deliver the relatively small volume of insulin required by a typical diabetic (about 0.1 to about 1.0 cm3 per day) in a nearly continuous manner. The delivery rate of a syringe pump can also be readily adjusted through a large range to accommodate changing insulin requirements of an individual (e.g., basal rates and bolus doses) by adjusting the stepping rate of the motor. While the syringe pump is unparalleled in its ability to precisely deliver a liquid over a wide range of flow rates and in a nearly continuous manner, such performance comes at a cost. Currently available insulin pumps are complicated and expensive pieces of equipment costing thousands of dollars. This high cost is due primarily to the complexity of the stepper motor and lead screw mechanism. These components also contribute significantly to the overall size and weight of the insulin pump. Additionally, because of their cost, currently available insulin pumps have an intended period of use of up to two years, which necessitates routine maintenance of the device such as recharging the power supply and refilling with insulin. These syringe type pumps, even if described as disposable, are simply too expensive to be truly disposable, or are alternatively disposed at a very high cost to patients and insurance companies alike.
- Shape memory alloys are a part of a class of materials that change shape when power is applied to them but that return to their natural state when the power is removed. The materials can be used to form an actuator by harnessing this unique attribute of the materials. A pump can be made with a shape memory alloy actuator. However, a shape memory alloy does not have the inherent accuracy and repeatability of the precision stepper motor used in a syringe pump. Although price is always important, precision is also essential in a pump used to deliver insulin or other drugs. It is therefore necessary to provide a system to precisely control and actuate a pump utilizing a shape memory material as an actuator.
- The present invention employs a cost effective yet precise pumping system and method to deliver insulin or other liquid to a user. Unique physical design aspects and an intelligent control system employed in the present invention allow for a shape memory alloy to actuate a pumping mechanism with excellent reliability and repeatability.
- The present invention allows for not only a cost effective pumping system, but also for a robust, precise, light weight, and fault tolerant system. Although the pumping system is precise, light weight, and fault tolerant, in the medical applications where the pump will be most advantageous, numerous reasons may make it desirable to dispose of and replace portions of the pumping system relatively frequently. The low cost of the pumping mechanism of the present invention allows for such disposable usage, while at the same time the pump is able to provide precision doses throughout the life of the pump. Stresses in the pump are minimized with the control system, and warnings can be generated if the pump is not primed properly or if an occlusion is detected within the pumping system. The reduction of stresses within the pump provides for a smaller and lighter weight pump with a longer lifetime, which is of obvious benefit to a user of the pump. Furthermore, the intelligent control system allows the pump to operate even if a fault is detected. For example, if the full stroke of the pump is unavailable for some reason, a lesser stroke can be utilized (at a higher frequency) and the pump can continue to provide the necessary dosage to the user.
- Additional aspects, advantages and features of the present invention are included in the following description of exemplary examples thereof, which description should be taken in conjunction with the accompanying figures, and wherein like (and similar) numerals are used to describe the same feature throughout the figures. While the prefix of a numbering element may change based upon the figure number, if the remainder of the numbering element is the same in the various embodiments, the component is the same or similar to that described regarding an earlier described embodiment. For example,
capacitor 304 ofFIG. 3 is the same or similar tocapacitor 504 ofFIG. 5 . When this is the case, the element will not be described again, and reference should be made to the description of the earlier figure (FIG. 3 in this example). All patents, patent applications, articles and other publications referenced herein are hereby incorporated herein by this reference in their entirety for all purposes. -
FIGS. 1A , 1B, and 1C illustratepump 100 at various stages of operation. -
FIGS. 1D is a block diagram of pumping system or “pump” 150. -
FIGS. 2A , 2B, and 2C illustratepump 200 at various stages of operation. -
FIGS. 3A and 3B illustrate different embodiments of pump drive circuits for use withpump 200 or other pump embodiments. -
FIGS. 4A and 4B illustratepump 400 at various stages of operation. -
FIG. 5 illustrates an embodiment of a pump drive circuit for use withpump 400 or other pump embodiments. -
FIGS. 6A and 6B illustratepump 600 at various stages of operation. -
FIGS. 7A and 7B illustratepump 700 at various stages of operation. -
FIG. 8 illustrates an embodiment of a pump drive circuit for use withpump 700 or other pump embodiments. -
FIGS. 9A and 9B illustratepump 900 at various stages of operation. -
FIGS. 9C , 9D, and 9E illustrate different embodiments of position encoding utilized for linear feedback. -
FIG. 10 illustrates an embodiment of a pump drive circuit for use withpump 900 or other pump embodiments. -
FIG. 11A is a graph of a pump operating in an unprimed state. -
FIG. 11B is a graph of a pump operating in a primed state. -
FIG. 11C is a graph of occlusion detection within a pump. -
FIGS. 12A and 12B are graphs of pump operation over time. - The present invention employs a cost effective yet precise pumping system and method to deliver insulin or other liquid to a user. Unique physical design aspects and an intelligent control system employed in the present invention allow for a shape memory alloy to actuate a pumping mechanism with excellent reliability and repeatability.
- The present invention allows for not only a cost effective pumping system, but also for a robust, precise, light weight, and fault tolerant system. Although the pumping system is precise, light weight, and fault tolerant, in the medical applications where the pump will be most advantageous, numerous reasons may make it desirable to dispose of and replace portions of the pumping system relatively frequently. The low cost of the pumping mechanism of the present invention allows for such disposable usage, while at the same time the pump is able to provide precision doses throughout the life of the pump. Stresses in the pump are minimized with the control system, and warnings can be generated if the pump is not primed properly or if an occlusion is detected within the pumping system. The reduction of stresses within the pump provides for a smaller and lighter weight pump with a longer lifetime, which is of obvious benefit to a user of the pump. Furthermore, the intelligent control system allows the pump to operate even if a fault is detected. For example, if the full stroke of the pump is unavailable for some reason, a lesser stroke can be utilized (at a higher frequency) and the pump can continue to provide the necessary dosage to the user.
- As mentioned briefly above, a shape memory alloy is used to actuate a pump made in accordance with the present invention. In the process of undergoing a dimensional change, the shape memory material goes through a reversible phase transition or transformation, or a reversible structural phase transition, upon a change in temperature. Generally, such a transition represents a change in the material from one solid phase of the material to another, for example, by virtue of a change in the crystal structure of the material or by virtue of a reordering of the material at a molecular level. In the case of nitinol, for example, the superelastic alloy has a low temperature phase, or martensitic phase, and a high temperature phase, or austenitic phase. These phases can also be referred to in terms of a stiff phase and a soft and malleable phase, or responsive phase. The particular phase transition associated with a particular alloy material may vary. Shape memory materials are well understood by those of ordinary skill in the art.
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Pump 100, an embodiment of a pump (or a portion thereof) of the present invention, is shown in the inactive state inFIG. 1A , the fully activated state inFIG. 1B , and the stress-loaded state inFIG. 1C . The pump body comprises acase 101, atop cap 102, and aplunger cap 103. Within the pump is aplunger 104 that is normally (in the inactive state) held against theplunger cap 103 by aplunger bias spring 105. Similarly, anoverload piston 106 is normally (in inactive state) held against thetop cap 102 by anoverload piston spring 107 which is stronger (has a higher spring constant k) than theplunger bias spring 105. Theplunger 104 is connected to theoverload piston 106 by a shapememory alloy wire 108 which contracts when heated by a pulse or pulses of current flowing from theV+ 109 contact to the V− 110 contact through the shapememory alloy wire 108 where the V− 110 contact may be the system ground (GND) reference. The power in each pulse is determined by the voltage applied to the shapememory alloy wire 108 through theV+ 109 and V− 110 contacts. It is worth noting that the case is made of an insulating material while theplunger 104 andoverload piston 106 are either made of a conductive material (e.g. metal) or are coated with an appropriately conductive material. Thetop cap 102 andplunger cap 103 may be made of insulating or conductive material as is best suited to a given design. -
FIG. 1A shows the pump in the inactive state where the shapememory alloy wire 108 is not contracted, theplunger 104 is held against theplunger cap 103 by theplunger bias spring 105 and theoverload piston 106 is held against thetop cap 102 by theoverload piston spring 107. This is the state to which thepump 100 returns after each activation or pumping cycle. -
FIG. 1B shows the pump in the fully activated state where the shapememory alloy wire 108 has contracted enough to pull theplunger 104 up against a stop built into thecase 101 without moving, whileoverload piston 106 which is held against thetop cap 102 by theoverload piston spring 107. This state realizes a full stroke of theplunger 104. -
FIG. 1C shows the pump in the stress-loaded state where the shapememory alloy wire 108 has contracted sufficiently to pull theoverload piston 106 up against a second stop built into thecase 101. In this state thecase 101,plunger 104,overload piston 106, and shapememory alloy wire 108 are under maximum stress. - The design of the
basic pump 100 is such that there is no feedback to the circuit driving the pump (open loop) and the action of the pump after the fully activated state shown inFIG. 1B is accommodated by the design margin to ensure that the pump reaches a fully activated state. If the pulse or pulses of current applied to the shapememory alloy wire 108 are reduced to the minimum value required to achieve the fully activated state under worst case conditions, such as a cold wire, then the action of thebasic pump 100 under best case conditions, such as a warm wire, will drive the pump toward the stress-loaded state shown inFIG. 1C . The design of thepump 100, and the selection of theoverload piston spring 107 is driven by the differences between the worst-case and best-case conditions. Under normal operating (non-fault) conditions the pump always completes the full stroke (the fully activated state) as shown inFIG. 1B and operates reliably over the expected life of the pump because excess contraction and the resultant stress are minimized (as seen in the stress-loaded state shown inFIG. 1C ). Considerations for the worst-case and best-case conditions include operating temperature range, the minimum pumping rate (e.g. the minimum basal delivery rate), and the maximum pumping rate (e.g. the maximum bolus rate). - It is important to note that the open-loop design of
pump 100 lacks feedback and thus cannot adaptively accommodate faults as they are not sensed. For example, a pump failure such as ajammed plunger 104 could cause a reduced or zero insulin delivery output and the pump would be assumed by the user (patient) to be operating correctly when an improper dose was delivered. -
FIG. 1D is a block diagram that shows the overall system of which the various pump embodiments are a part. Theoverall system 150 comprises amicroprocessor 150A,drive circuitry 150B, andpump element 150C. All of these components can be considered to form the pump, even thoughpump element 150C alone is also sometimes referred to as the pump among those skilled in the art. Many different embodiments of thepump 150C and of a portion of thedrive circuitry 150B are described in detail below, and throughout the application. In aninsulin delivery system 150, all of the components (that are shown) may be packaged together or alternatively they may be grouped separately. For example, it may be desirable to group the pump and drive circuitry together while remotely locating the pump element. Other components such as user input devices and a display are not shown, but are all controlled by the processor in conjunction with the pump and drive circuitry. - Another embodiment is illustrated in
FIG. 2 . The design shown inFIG. 2 comprises feedback that indicates the completion of the fully activated state but is otherwise similar to the pump shown inFIG. 1 . Thepump 200 incorporates feedback from a switch (“PISTON_NC 211”) that indicates that theoverload piston 206 is at the top of the pump or in contact withtop cap 202. A switch, such as switch 211 (that provides feedback) may alternatively be referenced for the feedback it provides in the following description. The pump withPISTON_NC 211 feedback shown inFIG. 2 is constructed and operates in a similar fashion to thebasic pump 100 shown inFIG. 1 . The feedback comes from a normally-closed (NC) switch that indicates theoverload piston 206 is in contact with thetop cap 202 as inFIG. 2A andFIG. 2B . When thepump 200 enters the overload state as shown inFIG. 2C then the switch opens and feedback is fed to the drive circuit. If the feedback is not received during the maximum pulse period used forpump 100 then an error has occurred and pump 200 operation can be discontinued. ThePISTON_NC 211 feedback is shown as connected directly to thetop cap 202 which indicates that thetop cap 202 is either made of a conductive material (e.g. metal) or is coated with an appropriately conductive material. If the design of a given pump requires thetop cap 202 to be made of an insulating material then thePISTON_NC 211 feedback can be moved to the inner surface of thetop cap 202 so that thePISTON_NC 211 feedback is in direct contact with theoverload piston 206 in the inactive state as shown inFIG. 2A . - An advantage of
pump 200 is fault detection based on the feedback from (normally closed) switch 211 (if the switch is not activated in the maximum pulse duration). The pump also saves energy because it terminates the activation pulse when full pump action is achieved. Minimizing energy consumption is extremely important for a portable insulin pump, as it maximizes the time the pump can be used without inconveniencing the user. -
FIG. 2C shows the pump in the stress-loaded state where the shapememory alloy wire 108 has contracted sufficiently to pull theoverload piston 206 down, but not up against a stop built into thecase 201. In this state, thecase 201,plunger 204,overload piston 206 and shapememory alloy wire 208, are under stress. However, that stress is limited to the spring constant (k) of theoverload piston spring 207 and is thus reduced as compared to the stress-loaded state shown inFIG. 1C where theoverload piston 106 is against a hard stop of thecase 101. The method used to further reduce the already minimized stress is the termination of the pulse or pulses of current that are flowing from theV+ 209 contact to the V− 210 contact through the shapememory alloy wire 208. This causes the shapememory alloy wire 208 to stop contracting and thus reduces the stress on thepump 200. - There are two primary methods to terminate the pulse or pulses to the shape
memory alloy wire 208 as shown inFIG. 3A andFIG. 3B . The actual drive circuits are identical and the only difference betweenFIG. 3A andFIG. 3B is in the Voltage Output (Vout) and feedback connections as discussed below. Each drive circuit is connected to apower source VCC 301 and to thesystem ground GND 302. Each has a pull-upresistor R 303 from the feedback toVCC 301 and an optional filtering or “debounce”capacitor C 304 from the feedback toGND 302. The feedback is digital and detects a logic ‘0’ when approximately 0V orGND 302 is present (i.e. the switch is closed) and a logic ‘1’ when a voltage approximately equal to the supply voltage orVCC 301 is present (i.e. through the function of the pull-upresistor R 303 when the switch is opened). If the optional filtering or “debounce”capacitor C 304 is not present then the feedback may oscillate briefly when the switch opens or closes due to mechanical vibration related to the switch contact. If the optional filtering or “debounce”capacitor C 304 is present then the feedback actually detects the voltage on thecapacitor C 304 which can not change instantaneously. When the switch closes thecapacitor C 304 will be discharged quickly to approximately 0V orGND 302; when the switch opens the capacitor will be charged at a rate proportional to the values of theresistor R 303 and thecapacitor C 304 to approximately the supply voltage orVCC 301. For example, aresistor R 303 value of 10,000 Ohms (10 kΩ) and acapacitor C 304 value of 100 pF would have a time-constant of one microsecond (1 μsec) and the state of the feedback would change from a logic ‘0’ to a logic ‘1’ in about two microseconds (2 μsec) without any oscillations (noise) on the feedback that could be acted upon by the drive circuit inappropriately. - The first method as shown in
FIG. 3A is to connect thePISTON_NC 211 to the feedback to gate the drive signal Vout that is created by the drive circuit and which is connected to thepump V+ 209 contact. When the drive circuit receives feedback that the overload state is entered as shown inFIG. 2C then the pulse or pulses can be terminated and both the stress is reduced and power is saved. The second method as shown inFIG. 3B is to provide power to thepump 200 through thePISTON_NC 211 contact rather than theV+ 209 contact. This method automatically removes power from the shapememory alloy wire 208 whenever thePISTON_NC 211 switch opens as shown inFIG. 2C . If the feedback is ignored (i.e. the drive circuit is simplified to remove the feedback), then theoverload piston 209 may oscillate between the states shown inFIG. 2B andFIG. 2C until the pulse or pulses from the drive circuit are terminated and only a partial power saving is realized. If the feedback is utilized as inFIG. 3A then when the drive circuit receives feedback that the overload state is entered as shown inFIG. 2C , the pulse or pulses can be terminated to prevent oscillations, and maximum power saving is realized as in the first method. - Addition of the
PISTON_NC 211 feedback reduces the overall forces generated within the pump and allows the pump to be made smaller and lighter with improved reliability. Unfortunately, if theplunger 204 jams then the overload piston will begin moving and provide feedback that indicates the pump is operating properly. Again, ajammed plunger 204 could cause a reduced or zero insulin delivery output, but in this situation the pump would be assumed by the user (patient) to be operating correctly when in fact an improper dose may have been delivered. - Another embodiment of the invention is seen in
pump 400 ofFIGS. 4A and 4B .Pump 400 incorporates feedback that (more directly) indicates the completion of the fully activated state. Pump 400 uses (PLUNGER_NO)switch 411 to indicate that theplunger 404 is against the upper stop. This switch is used in place of (or in conjunction with)switch 211, and all of the feedback control and stress limitation features described with respect to pump 200 are present inpump 400.Drive circuit 500 seen inFIG. 5 is similar to drivecircuit 300, as previously described. Pump 400 can also detect a fault with the pump if the plunger is not where it is expected to be based upon the potential applied to the actuator, as was also described previously. Similarly, the pump can detect a jam if the plunger is not where it is expected to be based upon the potential applied to the actuator. - Another embodiment of the invention is seen in
pump 600 ofFIGS. 6A and 6B .Pump 600 is functionally the same aspump 400 but lacksoverload piston 406 andoverload spring 407. Because of the lack of these items, thetop cap 607 preferably has some amount of compliance and acts as a simplified spring.Pump 600 has fewer parts and is thus lighter and smaller thanpump 600. Fewer parts also generally result in improved reliability over the life of the pump. - Yet another embodiment of the invention is seen in
pump 700 ofFIGS. 7A and 7B .Pump 700 is similar to pump 600 with the added advantage of feedback switch 710 (PLUNGER_NC) that directly indicates the completion of the fully activated state and return to the inactive state (at the completion of a pump cycle). Becausepump 700 “knows” when a pump cycle is completed (and when it should be completed) it therefore “knows” when there is a fault, and can accommodate for the fault in what is known as a fault tolerant design. The fault tolerance is in both the direct measurement of theplunger 704 action and in ensuring that the plunger is resting in the fail safe state after the maximum permissible pump cycle time (this may also indicate a major occlusion in the pump system). If the power (GND) to the V− 708 contact is switched (via a series switch) to provide additional fault tolerance as is done in some pump systems, then the added feedback will also indicate the state of the V− 708 switch (not shown for clarity sake) as the value of switch 710 (PLUNGER_NC) will be 0V (GND) when the series power switch is closed and VCC when the series power switch is open. The pump can also detect an occlusion if the plunger does not return to the fully down state in the maximum pump cycle time. - The
PLUNGER_NC 710 feedback is shown as connected directly to theplunger cap 703 which indicates that theplunger cap 703 is either made of a conductive material (e.g. metal) or is coated with an appropriately conductive material similar to thetop cap 202 ofFIG. 2 . If the design of a given pump requires theplunger cap 703 to be made of an insulating material then thePLUNGER NC 710 feedback can be moved to the inner surface of theplunger cap 703 so that thePLUNGER NC 710 feedback is in direct contact with theplunger 704 in the inactive state as shown inFIG. 7A .Drive circuit 800 illustrated inFIG. 8 is similar to the drive circuits previously described. Thepump 700 and drivecircuit 800 comprise the minimum configuration for a fault tolerant system. All of the linear feedback techniques described below add fault resolution and improve fault tolerance at the expense of added cost and complexity. - Embodiments of a pump as previously described may also comprise linear feedback that directly indicates the position of the plunger. The linear feedback may be analog or digital and is used to detect the position of the plunger. The linear feedback may also indicate if there is a fault based upon the position of the plunger during various phases of operation of the pump. The linear feedback system can employ conductive encoding marks. This is a simple and economical way to detect the position of the plunger. Alternatively, optical position sensing utilizing optical encoding marks may be employed. This is more precise but is also more complex and expensive.
-
FIGS. 9A and 9B illustratepump 900, another embodiment of the present invention.Pump 900 is similar to pump 700 but employs direct linear feedback in addition to the feedback provided by the switches. This feedback is contained in a linear feedback signal (“LINEAR_FB”) 911 shown in the figures. Linear feedback may also be used to detect priming of the pump, which will be described later with regard toFIGS. 11 . -
FIG. 9C illustrates one possible embodiment of position encoding, one way of providing linear feedback. In this embodiment the encoding scheme utilizes conductive encoding marks. One way to create the encoding grid is with insulating paint silk-screened onto a conductive surface so as to insulate certain areas. This conductive coating would be on the side of the moving part. For example, it could be directly on the piston or on an attachment to the piston. The black areas of the grid are the metal surface without paint on top of them. The white areas of the grid are covered with the insulating paint. The black row (long conducting strip) at the top is a reference ground. Whencontacts 930 touch the black squares then they are shorted to ground. When shorted to ground they are said to form a “1” whereas when they are not they form a “0.” This logic can be inverted if desired. - In the position depicted in
FIG. 9C , the ground contact is insulated from the most significant bit (“MSB”) contact and the least significant bit (“LSB”) contact. Therefore it is at position 0 (binary position 00). As this moving part slides left under thecontacts 930, then position 1 (binary position 01) will next be sensed. When the part slides left again position 2 (binary position 10) will next be sensed etc.FIG. 9C illustrates 4 positions, that is 2 bits of encoding for illustrative purposes. However, this can be extended to any number of positions. For example, 32 positions would require 5 bits. This digital position sensing can be used for digital feedback and control of the piston, and thus can be used to control position of the piston and the amount of insulin delivered. - Optical encoding may be employed instead of the conductive encoding described above. Instead of shorted contacts, an optical sensor (an LED+photocell, for example) is used to sense if the shiny metal is present or if light absorbing black paint is present.
- A minor modification to the encoding shown in
FIG. 9C is shown inFIG. 9D . InFIG. 9D the encoding marks or bits are laid down in a Grey code. That is, only one bit change is allowed per position. Grey codes have several desirable properties that are well known in the art. - Degradation of the contacts and various other parts can occur over time. For example, contacts can be dirty, worn, or broken, and contamination may cause faulty contact readings, etc. This would normally cause an error or misread. There are various ways to minimize the errors and to correct any errors that may occur. In one method, additional bits are added to the surface. A single bit (called a parity bit) can be added to detect some kinds of errors. Multiple bits can be added for even more error protection. With several added bits errors can be both detected and corrected. A measure of this is the Hamming distance, which is well known in the art. Briefly stated, the Hamming distance can be interpreted as the number of bits which need to be changed to turn one string into the other. Sometimes the number of characters is used instead of the number of bits.
- Error detection and correction theory is a well known science used as a part of radio communications theory, and can be applied to the encoding and position recognition mechanisms of the present invention. This includes BCH codes, parity codes, and Reed-Solomon codes, etc. The system of
FIG. 9E includes a parity bit that can be used for error correction encoded on the moving object. - Analog sensing of position can be made by plating two plastic, insulated surfaces with metal, or alternatively simply providing two metal surfaces. The two surfaces are used as capacitor plates—and together form a capacitor. One capacitor plate would be stationary, while the other capacitor plate would be part of the moving assembly including the piston. The measured capacitance is proportional to the distance between the plates, and therefore can be used to measure the position of the piston. This analog position sensing can be used for feedback and control of the moving part.
- Analog sensing of position can also be achieved with magnetic measurements by adding a magnet to the moving part and sensing on the stationary part. Similar to the capacitance measurement described above, the magnetic field will vary depending on the distance between the moving and stationary parts. Therefore, the magnetic sensor may be used to measure the position of the piston and this type of analog position sensing can be used for feedback and control of the moving part. One type of well known magnetic sensor is a Hall Effect sensor, but any magnetic sensor may be utilized.
- Resistance measurements may be used to implement analog linear feedback. Similar to a potentiometer, the piston will have different resistance values the further a measurement is taken along the length of the plunger. In other words, the resistance will increase with distance a current must travel.
- Usage of the linear feedback has many advantages. One advantage of employing the feedback is that the drive circuit can “servo” the plunger or control the position or stroke of the plunger with a relatively high degree of accuracy. Thus, a partial plunger stroke may be used to give finer dose delivery, and that dose can be any fraction of the pump cylinder volume. By measuring and controlling the plunger movement variable size rather than only discrete volume doses may be administered. Additionally, a partial plunger stroke may not only be detected when it is undesirable (as in pump 700), but the volume of the partial stroke may be measured and compared to the expected volume thus adding fault resolution. For instance, if a full stroke was supposed to take place and deliver a certain volume, the system can detect that less than the desired volume was pumped and make up for the missing volume or indicate a failure condition with a measure of the error being reported. A pump having position detection and control is more fault tolerant than a pump without it. For example, if a certain portion of the full stroke range is unavailable for some reason, the pump can control the stroke to only use the available range. This could provide invaluable additional operating time in what would otherwise be a malfunctioning or inoperative pump. For a diabetic who must have insulin the value of this is potentially life-saving.
- Another improvement to the basic pump design is to monitor the feedback as an indication of the operation of the entire pump system and not just the proper functioning of the plunger.
FIG. 11A shows a pump prior to being “primed” where there is air in the pump system leading to the patient including the tubing and infusion set (the portion attached to the user where insulin is delivered to the user's tissue). - Using
pump 900 as an example, although application in other embodiments such aspump 700 is also possible, at time t=0 (the initial time reference) thepump 900 is activated (the V− 908 switch is enabled if present and power is applied to theV+ 907 contact by the drive circuit 1000) as is shown inFIG. 9A . At time t=1 theplunger 904 begins to move andPLUNGER_NC 910 changes state from a Logic ‘0’ to a Logic ‘1’ to indicateplunger 904 movement. At time t=2 theplunger 904 activates thePLUNGER_NO 909 contact which changes state from a Logic ‘1’ to a Logic ‘0’ to indicate theplunger 904 has achieved a full upward stroke as is shown inFIG. 9B . This causes power to be removed by thedrive circuit 1000 via the feedback (FB_NO) and shortly thereafter the plunger begins to fall and thePLUNGER_NO 909 contact changes state from a Logic ‘0’ to back to a Logic ‘1’ as affirmed by thedrive circuit 1000 feedback. At time t=3 theplunger 904 has completed a full pump cycle andPLUNGER_NC 910 changes state back from a Logic ‘1’ to a Logic ‘0’ to indicate the completion of a full pump cycle as shown again inFIG. 9A (at this time the V− 908 series power switch is disabled if present to prevent possible pump “misfires” due to noise or other system errors). The digital feedback provides a simple and clear indication of a fault. - The same cycle is shown in
FIG. 11B where the pump system is fully primed and operating as compared to the unprimed state shown inFIG. 11A . The time from t=1 to t=2 is shorter inFIG. 11A than inFIG. 11B as thepump 900, specifically theplunger 904, is pulling air from the reservoir versus insulin. This may be due to the initial priming where air is being purged from the system or due to a reservoir failure. Similarly the time from t=2 to t=3 is shorter inFIG. 11A than inFIG. 11B as thepump 900, specifically theplunger 904, is pushing air through the tubing and infusion set versus insulin. In fact, the time from t=2 to t=3 may be used to detect a fully primed pump that is ready for insertion. If the tubing or infusion set were to break after insertion than the time from t=2 to t=3 would decrease and a fault could be detected. This phenomenon is similar to the affect of having air in brake hydraulic lines on an automobile where the brake feels soft due to the compressibility of air versus fluid. Priming the pump is analogous to “bleeding” the brakes. When the pump is primed it takes more energy to push the fluid through the tubing and infusion set. This pressure may increase even more when the insulin is pushed into the user's body (tissue). Since theplunger 904 is driven by theplunger spring 906, the extra force becomes related to time and is measured as the time from t=2 to t=3. - In fact, the priming techniques described above may be used to automatically prime a pump under the control of the
microprocessor 150A. Rather than have the user prime the pump manually, and stop when fluid, such as insulin, begins to emerge from the tip of an infusion set (not shown), the pump can use the feedback described above to prime the pump automatically and optionally ask the user to confirm that priming is complete. The priming can include the entire infusion set or other attachment to the pump, and not just the pump itself. This enhancement is especially important for young pump users and those who are vision impaired or otherwise have poor eyesight. Those users can rely on the automatic priming and can (optionally) confirm the priming by feeling the liquid as it exits the final point to be primed. - This automatic priming technique also applies in a similar fashion to other pump systems. For example, on a syringe pump system with a stepper motor, the power to the motor when monitored is an indication of the work done by the motor in a fashion analogous to work done by the
plunger spring 906. The work would be monitored by a shunt resistor used to measure the motor current, or alternatively the droop in the battery or power supply would be monitored to indicate power used by the motor and thus work done by the pump. -
FIG. 11C illustrates the occurrence and detection of an input occlusion (increase in time from t=1 to t=2) and output occlusion (increase in time from t=2 to t=3). This system preferably accounts for circuit variation and battery voltage droops so that these conditions are erroneously interpreted as an input or output occlusion. - The actuation of the plunger or piston can be modified or servo controlled to make the pump operate more efficiently and to reduce stress on the pump. This would allow for a smaller and lighter pump with improved reliability.
-
FIG. 12A is a graph illustrating pumping operation over time. The times inFIG. 12A correspond to the times shown inFIG. 11B . The rate of change of the position, as indicated bylinear feedback signal 911 increases over time until the piston reaches the top of its travel at time t=2. This will result in significant stress when the piston hits the hard stop. -
FIG. 12B is a graph illustrating pumping operation over time where the piston movement is modulated to reduce the acceleration and velocity of the piston before it hits the hard stop. This will reduce the amount of stress encountered by all of the moving parts of the pump. At time t=0.5 the power from thedrive circuit 1000 is reduced to reduce the stress (impact) at time t=2. This can include pulse width modulation (“PWM”) of the potential applied to the shape memory element. For example, the PWM rate may be modified to a new value or changed per a specified profile. Similar modification to the action of the piston could modify the profile leading to t=3 by adding occasional small pulses of energy to slow the descent of theplunger 904. - Although the various aspects of the present invention have been described with respect to exemplary embodiments thereof, it will be understood that the present invention is entitled to protection within the full scope of the appended claims.
Claims (16)
1. A pumping system comprising:
a chamber;
a piston within the chamber;
a shape memory element within the chamber that changes length when a current flows through the element,
the element moving the piston between a first and second physical limit, such that when the piston is at the first limit the chamber is occupied with liquid and when the chamber is at the second limit the chamber is substantially discharged of liquid; and
a first switch at the first limit that indicates if the piston is at the first limit.
2. The pumping system of claim 1 further comprising a second switch at the second limit that indicates if the piston is at the second limit.
3. The pumping system of claim 2 further comprising circuitry that senses the condition of the first and second switches.
4. The pumping system of claim 3 wherein the circuitry is operable to detect a pump malfunction if the piston is not at the first or second limit.
5. A method of dispensing liquid, comprising:
drawing liquid into a pumping chamber by causing a shape memory material to contract and move a piston;
expelling liquid from the pumping chamber by causing the shape memory material to relax and move the piston;
monitoring the position of the piston; and
controlling the position of the piston based upon the monitored position.
6. The method of claim 5 wherein monitoring the position of the piston comprises sensing the condition of one or more switches selectively activated depending upon the position of the piston.
7. The method of claim 5 wherein monitoring the position of the piston comprises utilizing encoding indicia provided on the piston.
8. The method of claim 5 wherein monitoring the position of the piston comprises measuring the strength of a magnetic field.
9. The method of claim 5 wherein monitoring the position of the piston comprises measuring the capacitance between a stationary conductive element and a conductive element that moves with the piston.
10-14. (canceled)
15. A pump comprising:
a reservoir having a maximum volume;
an actuator comprising a shape memory alloy that moves a plunger, the plunger displacing liquid from the reservoir; and
a control system that utilizes linear feedback to sense the position of the actuator and to manipulate the actuator to provide doses of variable volume less than the maximum volume.
16. The pump of claim 15 wherein the control system comprises a microprocessor.
17. The pump of claim 15 wherein the control system comprises means for position detection.
18. The pump of claim 15 wherein the control system determines if the pump is primed or not.
19. The pump of claim 18 wherein if the pump is not primed the control system creates a warning.
20-27. (canceled)
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US11/106,155 US7993108B2 (en) | 2002-10-09 | 2005-04-13 | Variable volume, shape memory actuated insulin dispensing pump |
US12/345,563 US8029250B2 (en) | 2002-10-09 | 2008-12-29 | Variable volume, shape memory actuated insulin dispensing pump |
US13/252,135 US20120083730A1 (en) | 2002-10-09 | 2011-10-03 | Variable Volume, Shape Memory Actuated Insulin Dispensing Pump |
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US12/345,591 Expired - Lifetime US8047812B2 (en) | 2002-10-09 | 2008-12-29 | Variable volume, shape memory actuated insulin dispensing pump |
US12/345,554 Expired - Lifetime US7993109B2 (en) | 2002-10-09 | 2008-12-29 | Variable volume, shape memory actuated insulin dispensing pump |
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US20050238503A1 (en) | 2005-10-27 |
EP1877662A4 (en) | 2009-09-23 |
CA2718306A1 (en) | 2006-10-26 |
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CN101189431A (en) | 2008-05-28 |
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WO2006113521A3 (en) | 2007-07-26 |
CA2604498C (en) | 2010-10-19 |
US7922458B2 (en) | 2011-04-12 |
US20090105649A1 (en) | 2009-04-23 |
US20090105648A1 (en) | 2009-04-23 |
US20090112165A1 (en) | 2009-04-30 |
US20090112156A1 (en) | 2009-04-30 |
US8029245B2 (en) | 2011-10-04 |
US7993109B2 (en) | 2011-08-09 |
US20090163869A1 (en) | 2009-06-25 |
WO2006113521A2 (en) | 2006-10-26 |
US8047812B2 (en) | 2011-11-01 |
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