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WO2025045815A1 - Dispositif d'administration de médicament - Google Patents

Dispositif d'administration de médicament Download PDF

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Publication number
WO2025045815A1
WO2025045815A1 PCT/EP2024/073808 EP2024073808W WO2025045815A1 WO 2025045815 A1 WO2025045815 A1 WO 2025045815A1 EP 2024073808 W EP2024073808 W EP 2024073808W WO 2025045815 A1 WO2025045815 A1 WO 2025045815A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
motor
pump
delivery device
drug delivery
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.)
Pending
Application number
PCT/EP2024/073808
Other languages
English (en)
Inventor
Thomas Wyss
Pawel KLUSEWICZ
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.)
Sensile Medical AG
Original Assignee
Sensile Medical AG
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 Sensile Medical AG filed Critical Sensile Medical AG
Publication of WO2025045815A1 publication Critical patent/WO2025045815A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M5/14248—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body of the skin patch 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
    • A61M5/14212—Pumping with an aspiration and an expulsion action
    • A61M5/14236—Screw, impeller or centrifugal type 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
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16804—Flow controllers
    • 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
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/172—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body electrical or electronic
    • 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
    • A61M2005/14268—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body with a reusable and a disposable component
    • 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
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
    • A61M2005/16863—Occlusion detection
    • 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
    • A61M2205/18—General characteristics of the apparatus with alarm
    • 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
    • A61M2205/50—General characteristics of the apparatus with microprocessors or computers

Definitions

  • This invention relates to a drug delivery device for subcutaneous administration of a liquid drug.
  • the drug delivery device may be in the form of a patch device.
  • Drug delivery devices in the form of a patch device for mounting on a patient’s skin for subcutaneous delivery of liquid drug are known. It is known to provide drug delivery devices in the form of a patch device with a single use disposable component assembled to a reusable component containing drive and control electronics, or as a single disposable component.
  • Safety is one of the most important design considerations in a drug delivery device. It is important to ensure that a drug has been properly and completely administered and that any occlusion or other factors that may affect the specified rate of delivery are reliably monitored.
  • One of the important aspects to monitor is in many cases the amount and rate of delivery of the drug to ensure correct dosage over time.
  • the safety and reliability also depend on the simplicity of operation and the robustness of any safety procedures designed to determine malfunctioning.
  • the volume of pumped liquid per full rotation of the rotor depends on the stroke (the axial displacement) of the rotor whereby certain inaccuracies in stroke measurement may occur due to slight tilting of the rotor.
  • the pump engine rotor engages elastic sealing members within the stator, it is possible for the rotor to tilt sightly whereby the tilt angle may be measured incorrectly as an axial displacement. Due to the small amplitudes of axial displacement per rotor cycle there is a need to ensure very accurate stroke measurement, this also serving to determine if the pump is functioning properly or if there is an occlusion or a leakage leading to under or over delivery of the liquid drug.
  • a drug delivery device in particular in the form of a patch device, with a disposable unit, or as an entirely disposable device, for administration of a liquid drug, that is safe, reliable, and compact.
  • a drug delivery device comprising a delivery unit and a drive unit, the delivery unit comprising a drug container and a pumping system having a pump engine with a stator and a pump rotor mounted within the stator and rotatably and axially movable within the stator configured to effect an axial piston stroke as a function of the rotation about an axis of rotation of the pump rotor relative to the stator for pumping liquid out of the drug container
  • the drive unit comprising a housing, an electronic control system, a pump drive including a motor, a motor output transmission shaft driven in rotation by the motor, a rotor position sensing system , and a coupling slidably coupled to the motor output transmission shaft driven in rotation by the motor output transmission shaft, the coupling having a pump side interface engaged with a drive coupling interface of the pump rotor configured for transmitting torque from the motor to the pump rotor and for effecting an axial displacement following an axial displacement of the pump rotor
  • the electronic control system comprising
  • the delivery control module is configured to emit an alarm condition defining an occlusion event of the drug delivery device triggered after an axial position of the rotor is measured as a value above an occlusion position threshold, or after an axial displacement amplitude of the rotor is measured below an occlusion displacement threshold, for at least two revolutions of the pump rotor within a window in a range of at least three to no more than ten revolutions.
  • said window is in a range of 5 to 8 revolutions.
  • the rotor axial position used for determining if the occlusion position threshold has been passed, or the rotor axial displacement used for determining if the occlusion displacement threshold has been passed is measured within an occlusion window defined by a rotational position of the rotor between an end of expel and a beginning of intake of a pump cycle defined by one revolution of the rotor, the occlusion window being in a both valves closed angular range.
  • the rotor position sensing system comprises at least one rotary position sensor for controlling the motor and thereby the pumping of a drug from the drug container with the pumping system
  • the motor drive circuit including a main controller configured for controlling signals for operation of the motor, and a supervision controller separate from the main controller and also connected to said at least one rotary position sensor for the rotor position sensing system, the supervision controller connected to an interlock circuit configured to control electrical power from the power source to the motor, the supervision controller configured to actuate the interlock circuit to interrupt power to the motor if the rotor position measurement signal does not match a set-point value within a predefined tolerance threshold.
  • the drive unit comprises the rotor position sensing system which is connected to the electronic control system configured to supply at least a rotor position measurement at least once per revolution to the delivery control module wherein the output transmission shaft is configured to be stopped by the delivery control module in a predefined park position at the end of each pulse operation.
  • the rotor position sensing system includes at least one rotary position sensor measuring a rotation of the motor output transmission shaft, and an axial sensor for measuring an axial displacement of the pump rotor, the axial sensor comprising a first axial position sensor mounted statically in the housing of the drive unit, and a second axial position sensor mounted statically in the housing of the drive unit, the first and second axial position sensors arranged on opposite sides of the rotation axis, the first and second angular positions being separated by 180°.
  • the rotary position sensor comprises an integrated incremental solver in the motor.
  • Figure 1a is a perspective view of a drug delivery device according to an embodiment of the invention.
  • Figure 1 b is a perspective view of a reusable unit and single use disposable unit of the drug delivery device of figure 1a prior to coupling and use;
  • Figure 1c is a cross-sectional view through the drug delivery device illustrated in figure 1a;
  • Figure 1d is a cross-sectional view through the drug delivery device illustrated in figure 1a showing the reusable unit and single use disposable unit prior to coupling and use;
  • Figure 2 is a functional block diagram of a drug delivery device according to an embodiment of the invention.
  • Figure 3 is a simplified schematic illustration of a drug delivery device according to an embodiment of the invention.
  • Figure 4a is a perspective cross-sectional view of part of a drug delivery device according to an embodiment of the invention.
  • Figure 4b is a side view of a part of the device of figure 4a, showing an output part of a pump drive;
  • Figure 5 is a diagram illustrating the functioning principle of a rotary and axial displacement of a rotor of the pumping system of a drug delivery device according to embodiments of the invention
  • Figures 6a and 6b illustrate schematically axial position sensors (stroke sensors) of a rotor position sensing system of a drug delivery device according to embodiments of the invention
  • Figure 7 illustrates schematically a plot of flow rate over time of a pump drive and pumping system of a drug delivery device according to an embodiment of the invention
  • Figure 8 is a simplified schematic diagram of an electronic control system of a drive unit of a drug delivery device according to an embodiment of the invention.
  • Figure 9 is a functional block diagram of a reusable unit of a drug delivery device according to an embodiment of the invention.
  • Figure 10 is a schematic plot of the axial displacement of a rotor as a function of the rotor rotational angle of a pumping system of a drug delivery device according to an embodiment of the invention, the plot illustrating a normal stroke path and an occluded stroke path;
  • Figure 11 is a graphical illustration of an observation window for determining occlusion based on a certain number of rotor axial position measurements.
  • a drug delivery device 1 comprises a housing 2, a delivery unit 3, and a control or drive unit 4, the delivery unit 3 and the control or drive unit 4 being assembled within the housing 2.
  • the housing 2 may be made of two or more parts allowing assembly of the delivery unit, drive unit and any other components within the housing.
  • the drug delivery device for subcutaneous administration of a liquid drug comprises a disposable portion formed by the delivery unit that may be assembled to a reusable portion formed by the drive unit, the drive unit including electronics and a power supply.
  • Components of the delivery unit 3 are mounted in a first housing portion of the drug delivery device and components of the drive unit 4 are mounted in a separable second housing portion such that the drive unit 4 can be reused with subsequent delivery units.
  • the embodiments shown in the figures concern a two-part drug delivery device with disposable and reusable units, within the scope of the invention for various aspects described herein, the whole drug delivery device may be provided as a single use disposable unit.
  • the administration may occur in a single dose over a short period of time, typically less than 1 hour, for instance around 30 minutes or less, or may be for subcutaneous injection of a liquid drug over an extended period of time from a few hours to a few days.
  • the drug delivery device includes a user interface 46 that may include one or more buttons for actuating the drug delivery device, light and/or sound status indicators, and optionally a screen or other display for presenting information to an operator of the device.
  • Drug delivery devices according to embodiments of the invention may advantageously be configured as a patch device for mounting on a patient’s skin.
  • an adhesive layer 51 may be provided on an outer surface of a skin contact wall 48 of the housing 2 covered by a protective film 50 that may be peeled off the adhesive layer 51 prior to placing the adhesive layer on the patient’s skin at the site of injection.
  • a needle orifice on the skin contact side is covered by the protective film 50 prior to use, and allows a transcutaneous injection needle (not shown) to extend therethrough and pierce the patient’s skin upon activation of the drug delivery device 1 .
  • the delivery unit 3 comprises a drug container 5 containing a liquid drug, for instance a drug cartridge with a stopper as per se well known, and a liquid flow system for channelling the liquid drug to a patient subcutaneously.
  • the drug delivery device further includes a pumping system that causes liquid from the drug container to be pumped to the injection needle (not shown) once the drug delivery device has been activated.
  • the delivery unit 3 incorporates a pump engine 38 of the pumping system 8 that causes liquid from the container to be pumped to the injection needle once the drug delivery device has been activated.
  • the pump engine 38 comprises a drive coupling interface 40 that couples to a complementary coupling interface 39 of a pump drive 7 of the drive unit 4.
  • the drive unit thus provides the mechanical power via the coupling interface 39, 40 to drive the pump engine 38.
  • the pump engine 38 in the delivery unit 3 may advantageously comprise a design and configuration similar to the pump engine described in WO 2007074363, WO 2015015379, WO2019228895A1 , or W02020069926A1 , in which a pump rotor 31 is mounted within a stator 29 and is rotatably and axially movable within the stator 29 in order to pump a fluid from a fluid inlet to a fluid outlet.
  • the pump rotor 31 has a pump shaft with first and second diameters surrounded by seals that open and close a fluid channel between the inlet and outlet as the rotor rotates and axially displaces due to a cam mechanism between the stator 29 and pump rotor 31 , whereby during the opening and closing of the valves between the fluid inlet and pumping chamber, respectively between the pumping chamber and outlet, a pumping action is performed.
  • the pump engine 38 thus comprises:
  • a pump rotor 31 rotatably and axially slidably mounted at least partially in the stator 29, the pump rotor 31 comprising a first axial extension having a first diameter and a second axial extension having a second diameter greater than the first diameter,
  • a first valve formed by a first valve seal mounted on the stator around the first axial extension, in conjunction with a first channel in the rotor that is configured to allow fluidic communication across the first valve seal when the first valve is in an open position
  • a second valve formed by a second valve seal mounted on the stator around the second axial extension, in conjunction with a second channel in a rotor that is configured to allow fluidic communication across the second valve seal when the second valve is an open position.
  • the pumping volume displacement rotation can be easily configured for optimal operation with an electrical motor of a given type rotating with a constant speed.
  • the pump engine parts can be made entirely of polymer materials and the rotor may be easily coupled to the pump drive ensuring a sterile barrier between the fluidic portion of the pump engine and the coupling interface.
  • the drive unit 4 comprises a user interface 46 that may have different configurations depending on the drug to be administered and the intended applications.
  • the user interface may be very simple having an activation button to start the drug delivery process, and a status indicator for instance a status light and a speaker for example.
  • Embodiments of the drug delivery device in the form of a patch pump may in particular be for administration of a predetermined amount. Certain applications may simply require administration of a drug in a predetermined dose at a certain time after an event.
  • the drug delivery device may comprise the drive unit, which forms a re-usable unit, coupled to a disposable unit that includes the delivery unit and cartridge, for adherence to a patient’s skin for a single dose delivery over a period of time that may last up to a few hours, after which the drug delivery device is removed and the disposable part thrown away.
  • the re-usable part may be re-used with a subsequent disposable device when the patient next requires an administration of a drug, for instance 48 hours later.
  • the drive unit 4 further comprises a power source 28 including a battery, an electronic control system 6 and a pump drive 7 that provides the torque driving the pumping system 8 in the disposable delivery unit 3.
  • the drive unit 4 further comprises a rotor position sensing system to monitor and control the pumping operation and to detect under or over delivery, for instance due to occlusion or leakage.
  • the pump drive 7 comprises a motor 16 having an output transmission shaft 17 that is coupled to a coupling 21 which is axially movable with respect to the output transmission shaft 17 and biased with a spring 36.
  • the coupling 21 has a pump side interface 39 configured to bias against and engage a drive coupling interface 40 of the pump rotor 31 of the pump engine 38 of the delivery unit pumping system.
  • the pump side interface 39 comprises a form complementary to a form of the drive coupling interface 40 of the pump engine 38 configured to transmit torque generated by the motor 16 to the pump engine pump rotor 31.
  • the spring 36 is configured to bias and press the coupling 21 against the pump rotor 31 of the pump engine 38 and to ensure the axial pumping displacement of the rotor in conjunction with cam elements on the pump engine rotor 31 biased against cam elements on the pump engine stator 29.
  • the axial stroke of the coupling 21 of the pump drive 7 thus corresponds to the axial stroke of the pump engine pump rotor 31
  • the rotary displacement of the motor output transmission shaft 17 corresponds to the rotary displacement of the pump engine pump rotor 31.
  • the coupling 21 slidably engages the motor output transmission shaft 17 such that the coupling 21 can move axially, as a function of the rotation of the motor output transmission shaft 17, the axial displacement being defined by the cam arrangement between the pump rotor 31 and stator 29 of the pump engine 38 as per se known in the prior art rotary piston pumps as mentioned above.
  • the coupling 21 comprises slide grooves 19b on a motor facing side, that are slidably engaged by slide protuberances 19a on a coupling side interface 18 of the motor output transmission shaft 17.
  • the grooves and protuberances on the coupling and transmission shaft may be inverted, or other mechanical configurations that allow to transmit torque yet allow relative axial movement, such as a spline shaft, may be employed instead of the illustrated embodiments.
  • a plurality of protuberances 19a and corresponding grooves 19b, for instance two, three or four may be distributed around the circumference for better guidance and positioning of the coupling and to reduce the frictional resistance between each protuberance and corresponding sliding engaging surface of the groove.
  • the rotor position sensing system 9 comprises a rotary position measurement system and an axial position sensor (stroke sensor) 23.
  • the rotor position sensing system 9 is configured to measure the axial and rotational position of the pump engine pump rotor 31 and therefrom also the displacement of the rotor.
  • the rotary position measurement system may be directly integrated in the motor 16 as per se known in conventional motors, for instance in the form of an increment solver integrated in the motor.
  • Other rotary measurement systems per se known for electrical motor drives may be used within the scope of the invention.
  • the rotor position sensing system may further comprise a rotational index sensor 22 that defines at least one rotational position, for instance by means of a discrete magnet or a pair of discrete magnets positioned on the circumference of the motor output transmission shaft 17 to detect a specific rotational position of the output transmission shaft 17.
  • the discrete reference position magnet may for instance be positioned and a corresponding magnetic field sensor positioned on the circuit board 27 or in a housing portion and connected to the circuit board such that a specific rotor position can be detected.
  • the rotational index sensor 22 can also be used to set a reference rotational position for resetting the counting performed by the rotary position sensor 20 to determine an angular position relative to the reference position defined by the rotation index sensor 22.
  • the rotational index sensor 22 may also be integrated within the motor 16.
  • the axial position sensor 23 comprises an axial position magnet 23a mounted on the coupling 21 , a first axial position sensor 23b for instance in the form of a magnetic field sensor such as a Hall sensor, and a second axial position sensor 23c similar to the first axial position sensor 23b positioned on an opposed side of the coupling, facing the first axial position sensor.
  • the axial position magnet 23a has a north-south magnetic pole orientation that is axially aligned and the displacement of the annular axial position magnet 23a in the axial direction changes the direction and intensity of the magnetic field measured by the first and second axial position sensors 23b, 23c as a function of the axial position relative to the stator.
  • the first and second axial position sensors 23b, 23c will measure a different axial position.
  • the axial position measurement of the first and second axial position sensors however may be summed or averaged in order to determine the true axial position at the center line of the pump rotor 31 that defines the actual or true stroke of the rotor and thus of the pumped volume. Summing of the outputs of the first and second axial position sensor allows to amplify the output of the axial measurement signal.
  • the second axial position sensor 23c also provides an additional stroke measurement value to that of the first axial position sensor 23b, which may provide a redundant safety measurement of the axial displacement and thus of the pumped volume of drug. A faulty stroke measurement can thus be more safely detected with the two axial position sensors.
  • the first axial position sensor 23b which may for instance be in the form a Hall sensor provided in an integrated circuit chip, may advantageously be mounted on the main circuit board 27, and the second axial position sensor 23c may be mounted on a secondary circuit board 24 that is connected via conducting wires or cable to the main circuit board and held to a housing part or relative to the main circuit board with a holder bracket.
  • the volume of liquid pumped for one pump cycle namely a 360° rotation of the pump rotor 31
  • the flow rate of the liquid is varied by varying the rotational speed of the rotor which thus changes the frequency of the axial strokes and thus of the flow rate.
  • This however requires that the motor of the pump drive can supply the required power for pumping over a large range of rotational speeds.
  • an electrical motor typically has a small rotational speed range at which it delivers maximum power, a motor that is used over a large speed range would need to be larger and require more complex control systems than if it were to operate only at a constant speed corresponding to its optimal power to size ratio.
  • the pump drive is configured to operate the motor at a predefined rotational speed, corresponding to the motor’s optimal operating point in terms of torque and speed, and adjust the flow rate by switching the motor off for pauses between pulses of the predefined rotational speed. It may however be noted that there may be more than one predefined rotational speed, in other words the motor may also have two optimal operating points and function at two different speeds for adjusting very large operating ranges with pauses and pulses.
  • the pumping operation may comprise no pauses and simply rotate at the predefined rotational speed without pauses.
  • the pulses may be of a substantially constant duration, for instance one to ten rotations of the rotor followed by a pause duration that defines the flow rate.
  • the pulse and pause durations may be each adjusted to have each variable duration.
  • predefined rotational speed comprises a constant nominal speed at steady state operation, it being understood that the motor will of course need to accelerate to the nominal operating speed and then decelerate when switched off.
  • the flow rate command of the motor however depends on the switching on and off times that define the pulse and pause durations, the power supply to the motor phases being the same for each pulse cycle.
  • the rotor position sensing system 9 may be used to ensure that the rotor is stopped at each end of the pulse duration in a specific park position and subsequently restarted at the next pulse at the same park position in order to ensure that each pulse duration has a specific defined number of full (360°) rotor rotations.
  • pulse i.e. switching on and then off
  • different pulse i.e. switching on and then off
  • the pattern of pause and pulses as a function of the flow rate may be stored in a memory 14 of the electronic control system, for instance in the form of a look-up table accessed by the control system for implementing a specified flow rate, or may be computed based on a stored function.
  • the flow rate and overall pattern of flow of drug to be administered may be predetermined and factory set in the memory of the drug delivery device.
  • the electronic control system 6 comprises a motor drive circuit 10 including a motor driver controlling operation of the motor 16, the motor driver being controlled by a main controller 11 that receives at least one rotor position sensing signal from the rotor positioning sensing system 9 measuring the rotation of the output transmission shaft 17 of the motor 16.
  • the main controller receives at least the measurement information from the rotational index sensor 22, but may further receive sensing measurement from the rotor position measurement system in the motor and/or from the axial position sensors 23.
  • the main controller determines the operation of the motor driver depending on the desired or specified flow rate whereby if the delivery control module of the motor drive circuit 10 comprises a pulse and pause operating mode as previously described, the motor main controller 11 commands the switching on and switching off of the pulsed operation.
  • the rotor position sensing system 9 is further connected to a supervision controller 12 which is separate from the main controller 11 .
  • Both the supervision controller and main controller may advantageously be in the form of integrated circuits, separately mounted on the main circuit board 27 and communicating to each other via an Inter-process communication (IPC) protocol.
  • the supervision controller and main controller each have their own clock (crystal oscillator) to ensure completely independent operation.
  • the supervision controller monitors the operation of the motor 16 based on the rotor position sensing system input into the main controller and the supervision controller, and in case the sensing information does not correspond to the desired or programmed flow rate the supervision controller stops sending toggling signals to an interlock circuit 13 disposed between the power source 28 and the motor 16.
  • the power supply to the motor is supplied through the interlock circuit 13 and in case of a discrepancy between the measured rotor position from the rotor position sensing system 9 and the desired or programmed flow rate, the supervision controller commands the interlock circuit 13 to cut the power to the motor 16.
  • the main controller is configured to control the motor power using a separate circuit which is supplied with power going through the interlock circuit. Both the main and supervision controllers must turn the power on to the motor for motor to operate since the ‘interlock circuit’ and ‘motor driver’ are connected in series with the motor.
  • the supervision controller receives from the main controller a request to turn on motor power (by a toggling interlock signal) over the IPC interface with the command for motor start, number of motor rotations and time window.
  • the time window is the time within which the next request is expected and depends on the therapy/delivery patterns. For instance there may be two patterns used illustrated by the following example: 17 rotations, delivered every 120 seconds for the first therapy hour (phase 1 ) and 7 rotations, delivered every 116 seconds for the further four hours of the therapy (phase 2).
  • the supervision controller After reception of the request to turn on motor power, the supervision controller starts three internal software (SW) timers with timeout equal to the received ‘time window’ extended by 20% (timer 1) and one reduced by 20% (timer 2) and a 3rd timer with timeout equal to the number of rotations multiplied by the maximum time for a motor rotation (timer 3). Afterwards the supervision controller turns on motor power (starts toggling interlock). During the time when timer 3 is running, the supervision controller monitors the number of motor revolutions. If the number of revolutions is higher by more than 1 from the ’number of rotations’ requested by the main controller, the supervision controller turns off motor power and sends information about failure to the main controller to raise an alarm.
  • SW internal software
  • the supervision controller turns off motor power and sends information about failure to the main controller to raise an alarm.
  • the supervision controller monitors also time elapsed between motor rotation requests. The next motor rotation request is expected between timer 1 and timer 2 expiry. If a new request is received before timer 1 expiry, an over-delivery situation is recognized by the supervision controller. If the next request is not received before timer 2 expiry, then an under-delivery is recognized by the supervision controller. In both cases the supervision controller interrupts motor power and sends an alarm request to the main controller.
  • the separate main controller and supervision controller thus provide two separate channels for measuring the operation of the motor and thus the pumping operation in an independent manner while at the same time having only one main controller to control the functions, the other serving only to supervise and stop drug delivery in case of a faulty operation being detected.
  • Action of the supervision controller 12 on the interlock circuit provides a simple and reliable safety mechanism for switching off drug administration in case of faulty operation, in an economical manner.
  • An advantage of using the interlock circuit is that if there is a technical failure of supervision controller leading to permanent logical T or ‘0’ on the interlock pin connected to the interlock circuit, the motor power will be disconnected until the interlock circuit receives a permanent changing signal, for instance with frequency about 100Hz, to turn on motor power.
  • the delivery supervision software module installed in the motor drive circuit 10 of the electronic control system comprises an occlusion detection module configured to detect occlusion according to the principle of operation illustrated in figure 10. If the fluid flow path is occluded, preventing administration of the drug to the patient, the axial displacement of the pump engine pump rotor 31 is hindered such that the axial pump stroke does not follow the expected path. If the fluid flow downstream of the pump engine is blocked, the pump rotor 31 cannot effect an axial movement since it cannot empty the pump chamber and thus remains at a chamber full or partially full level.
  • An occlusion event may be detected either by measuring an axial position of the rotor, the occlusion event detected if the axial position is measured as a value above an occlusion position threshold, or by measuring an axial displacement amplitude of the rotor, the occlusion event detected if the axial displacement is measured below an occlusion displacement threshold.
  • each pump cycle (360° rotation of the pump rotor 31) displaces only a small amount of liquid, for instance in a range of 1 pL to 10pL, and it may occur that an occluded stroke path is detected from time to time during drug administration due to very short duration temporary blockages.
  • temporary blockages may for instance arise due to a temporary movement of the catheter or canula relative to the subcutaneous tissue when the patient makes a movement, or due to bending of the canula or pinching of the catheter tube, or due to a shock on the drug delivery device that disturbs the axial position measurement, or due to some external factor.
  • the occlusion detection module thus requires a minimum of two rotation cycles with an observation window in a range of two to ten successively measured occlusion events, in order to trigger an occlusion detection alarm.
  • the observation window is of at least five, for instance between five and eight, whereby if occlusion detection occurs at least three to five times within the observation window of five to eight cycles, the alarm condition is met.
  • the axial position of the pump rotor is preferably measured within a certain rotation angle of the rotor that defines an occlusion measurement window within which the measurement is taken at each successive pump cycle (a cycle corresponding to a complete 360° rotation of the pump rotor).
  • This occlusion window preferably is between the end of the expel and the beginning of the intake phases, preferably when both the inlet and outlet valves are closed, this occlusion window being substantially centrally positioned between the end of the expel and the beginning of the intake phases of the pump. The latter ensures that a specific window for detection of the axial position is consistently used at each rotation cycle and that this window is during a valve’s closed position for the most reliable position measurement.
  • the delivery supervision software module and delivery control software module installed in the motor drive circuit 10 of the electronic control system 6 may perform various control and safety functions that are exemplified in the table below. List of references
  • Rotary position sensor Rotational index sensor 22 Axial position sensors (stroke sensor) 23
  • First axial position sensor 23b e.g. Hall sensor
  • Second axial position sensor 23c (e.g. Hall sensor)

Landscapes

  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dermatology (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

Dispositif d'administration de médicament comprenant une unité d'administration (3) et une unité d'entraînement (4), l'unité d'administration comprenant un récipient de médicament (5) et un système de pompage (8) ayant un moteur de pompe (38) pourvu d'un stator (29) et d'un rotor de pompe (31) configuré pour effectuer une course de piston axial en fonction de la rotation autour d'un axe de rotation du rotor de pompe par rapport au stator pour pomper le liquide hors du récipient de médicament, l'unité d'entraînement comprenant un boîtier (2), un système de commande électronique (6), un entraînement de pompe (7) comprenant un moteur (16), un arbre de transmission de sortie de moteur (17) entraîné en rotation par le moteur (16), un système de détection de position de rotor (9), et un accouplement (21) couplé de manière coulissante à l'arbre de transmission de sortie de moteur (17) entraîné en rotation par l'arbre de transmission de sortie de moteur, le couplage (21) ayant une interface côté pompe (39) en prise avec une interface de couplage d'entraînement (40) du rotor de pompe (31) conçue pour transmettre un couple du moteur (16) au rotor de pompe (31) et pour effectuer un déplacement axial suite à un déplacement axial du rotor de pompe (31), le système de commande électronique (6) comprenant un circuit d'entraînement de moteur ayant un module de commande d'administration, le module de commande d'administration recevant une mesure de position axiale du rotor de pompe (31) en fonction de la position de rotation du rotor de pompe. Le module de commande d'administration est conçu pour émettre une condition d'alarme définissant un événement d'occlusion du dispositif d'administration de médicament déclenchée après qu'une position axiale du rotor a été mesurée comme une valeur supérieure à un seuil de position d'occlusion, ou après qu'une amplitude de déplacement axial du rotor a été mesurée comme une valeur inférieure à un seuil de déplacement d'occlusion, pendant au moins deux révolutions du rotor de pompe (31) au sein d'une fenêtre dans une plage comprise entre trois et dix révolutions.
PCT/EP2024/073808 2023-08-31 2024-08-26 Dispositif d'administration de médicament Pending WO2025045815A1 (fr)

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EP23194638.5 2023-08-31
EP23194638 2023-08-31

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007074363A2 (fr) 2005-12-28 2007-07-05 Sensile Pat Ag Micropompe
US20130237955A1 (en) * 2010-11-01 2013-09-12 Medingo Ltd. Fluid Dispensing Device with a Flow Detector
WO2015015379A1 (fr) 2013-07-30 2015-02-05 Sensile Pat Ag Dispositif d'administration de médicament à mécanisme d'actionnement d'aiguille
US20160367751A1 (en) * 2015-06-22 2016-12-22 Medtronic Minimed, Inc. Occlusion detection techniques for a fluid infusion device having a rotary pump mechanism and rotor position sensors
WO2019228895A1 (fr) 2018-05-28 2019-12-05 Sensile Medical Ag Dispositif d'administration de médicament doté d'un mécanisme d'actionnement d'aiguille
WO2020069926A1 (fr) 2018-10-01 2020-04-09 Sensile Medical Ag Mécanisme d'administration par voie sous-cutanée pour dispositif d'administration de médicament

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007074363A2 (fr) 2005-12-28 2007-07-05 Sensile Pat Ag Micropompe
US20130237955A1 (en) * 2010-11-01 2013-09-12 Medingo Ltd. Fluid Dispensing Device with a Flow Detector
WO2015015379A1 (fr) 2013-07-30 2015-02-05 Sensile Pat Ag Dispositif d'administration de médicament à mécanisme d'actionnement d'aiguille
US20160367751A1 (en) * 2015-06-22 2016-12-22 Medtronic Minimed, Inc. Occlusion detection techniques for a fluid infusion device having a rotary pump mechanism and rotor position sensors
WO2019228895A1 (fr) 2018-05-28 2019-12-05 Sensile Medical Ag Dispositif d'administration de médicament doté d'un mécanisme d'actionnement d'aiguille
WO2020069926A1 (fr) 2018-10-01 2020-04-09 Sensile Medical Ag Mécanisme d'administration par voie sous-cutanée pour dispositif d'administration de médicament

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