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Motion activated septum puncturing drug delivery device

  • US 10,159,785 B2
  • Filed: 01/09/2015
  • Issued: 12/25/2018
  • Est. Priority Date: 03/26/2012
  • Status: Active Grant
First Claim
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1. A wearable drug delivery apparatus for administering a drug to a subject, the drug delivery system comprising:

  • a housing having a base surface configured to be positioned proximate the subject'"'"'s skin, the base surface defining a base plane;

    an actuator positioned within the housing and having a rotatable shaft;

    a reservoir positioned within the housing and defining a longitudinal axis thereof, a proximal end thereof and a distal end thereof, the longitudinal axis being substantially parallel to the base plane;

    a plunger movably mounted in the reservoir, the plunger being movable along the longitudinal axis;

    a reservoir needle connected to the distal end of the reservoir;

    a stationary septum mounted in the housing and having a flexible canal connected thereto, the reservoir and the reservoir needle being movable in the housing along the longitudinal axis between a sealed configuration, in which the reservoir needle is embedded in the stationary septum, and a discharge configuration, in which the reservoir needle fully punctures the septum, thereby putting the reservoir in fluid communication with the flexible canal;

    an injection needle fluidly connected to the reservoir through the flexible canal when the reservoir needle is in the discharge configuration;

    an injection needle septum sealing an injection needle opening in the housing, the infection needle configured to pass through the injection needle septum for positioning in flesh of the subject with a tip of the injection needle positioned beneath a surface of the flesh;

    at least one gear operatively connected to the rotatable shaft of the actuator and the plunger such that rotational motion of the at least one gear driven by the rotatable shaft of the actuator results in translational motion of the plunger along the longitudinal axis of the reservoir;

    a controller positioned within the housing, the controller configured to drive the actuator by a pulse width modulation to rotate the gears and cause the plunger to translate within the reservoir, the plunger and reservoir configured to cause the drug to flow from the reservoir when the plunger moves toward the distal end, thereby causing the drug to flow through the flexible canal, through the needle and out of the tip of the needle;

    a power supply positioned within the housing, the power supply providing power to the controller and the actuator; and

    a sensor positioned within the housing, the sensor configured to take measurements of rotations of the rotatable shaft of the actuator and transmit the measurements to the controller, the rotations being directly proportional to translational movement of the plunger, the controller notifying the subject of a malfunction if the rotatable shaft of actuator one of fails to rotate and rotates too slowly upon application of power.

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