Drive mechanism for drug delivery pumps with integrated status indication
First Claim
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1. A drug pump drive mechanism for use in cooperation with a drug container including a plunger seal and a power and control system, the drive mechanism comprising:
- a drive housing including an axis, the housing further including at least one window,a piston disposed for movement from at least a retracted first position to an extended second position along said axis, the piston adapted to impart movement to the plunger seal within the drug container,at least one biasing member disposed and adapted to move from an energized first position to a deenergized second position as a result of the release of energy, the biasing member being disposed to cause movement of the piston from the retracted first position to the extended second position as the biasing member moves from the energized first position to the deenergized second position,a retainer, the retainer being moveable between a retaining first position and a releasing second position, the retainer disposed to maintain the biasing member in the energized first position when the retainer is in the retaining first position, and to release the biasing member from the first energized position when the retainer moves to the releasing second position,a sleeve assembly disposed at least partially within the drive housing, at least a portion of the sleeve assembly being adapted to move along said axis with the piston, at least a portion of the sleeve assembly being visible through said window when the piston is one of the retracted first position or the extended second position, the sleeve assembly not being visible through said window when the piston is in the other of the retracted first position or the extended second position, andan end-of-dose indicator, the end-of-dose indicator including at least one switch interconnect, at least a portion of which is disposed substantially adjacent the window and adapted to identify at least one of when the sleeve assembly is disposed subjacent the window and when the sleeve assembly is not disposed subjacent the window, the switch interconnect including a mechanical trigger adapted to engage the sleeve assembly through the window, the switch interconnect further being adapted to selectively engage the power and control system as a result of the engagement or disengagement end of the trigger.
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Accused Products
Abstract
A drive mechanism includes a housing, a piston adapted to impart movement to a plunger seal within a drug container, a plurality of biasing members disposed in parallel, and a retainer. The biasing members are disposed to release energy to cause movement of the piston from a retracted first position to the extended second position, the piston bearing against the plunger seal to dispense medicine. The retainer is disposed to maintain the biasing members in the energized position and to release the biasing members to permit the piston to dispense the medicine. The drive mechanism may also include an end-of-dose indicator to identify at least one of when the sleeve assembly is disposed subjacent a window in the housing, the relative motion of the sleeve assembly with reference to the window or another reference component, the stoppage of such motion, and the rated or change of rate of motion.
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Citations
20 Claims
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1. A drug pump drive mechanism for use in cooperation with a drug container including a plunger seal and a power and control system, the drive mechanism comprising:
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a drive housing including an axis, the housing further including at least one window, a piston disposed for movement from at least a retracted first position to an extended second position along said axis, the piston adapted to impart movement to the plunger seal within the drug container, at least one biasing member disposed and adapted to move from an energized first position to a deenergized second position as a result of the release of energy, the biasing member being disposed to cause movement of the piston from the retracted first position to the extended second position as the biasing member moves from the energized first position to the deenergized second position, a retainer, the retainer being moveable between a retaining first position and a releasing second position, the retainer disposed to maintain the biasing member in the energized first position when the retainer is in the retaining first position, and to release the biasing member from the first energized position when the retainer moves to the releasing second position, a sleeve assembly disposed at least partially within the drive housing, at least a portion of the sleeve assembly being adapted to move along said axis with the piston, at least a portion of the sleeve assembly being visible through said window when the piston is one of the retracted first position or the extended second position, the sleeve assembly not being visible through said window when the piston is in the other of the retracted first position or the extended second position, and an end-of-dose indicator, the end-of-dose indicator including at least one switch interconnect, at least a portion of which is disposed substantially adjacent the window and adapted to identify at least one of when the sleeve assembly is disposed subjacent the window and when the sleeve assembly is not disposed subjacent the window, the switch interconnect including a mechanical trigger adapted to engage the sleeve assembly through the window, the switch interconnect further being adapted to selectively engage the power and control system as a result of the engagement or disengagement end of the trigger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeUNL Holdings, LLC
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Original AssigneeUnitract Syringe Pty Limited (Unilife Corp.)
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InventorsHatch, Christopher Edward, Bente, IV, Paul F., O'Connor, Sean M., Agard, Ryan M., Ciccarelli, Nicholas J., Love, John C., Hanson, Ian B., Bokelman, Kevin
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Primary Examiner(s)Bouchelle, Laura
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Application NumberUS14/230,784Publication NumberTime in Patent Office1,205 DaysField of SearchUS Class CurrentCPC Class CodesA61M 2005/14252 with needle insertion meansA61M 2005/2474 with movable piercing means...A61M 2205/3317 Electromagnetic, inductive ...A61M 2205/3379 Masses, volumes, levels of ...A61M 2205/50 with microprocessors or com...A61M 2205/58 Means for facilitating use,...A61M 2205/82 Internal energy supply devicesA61M 5/14216 Reciprocating piston typeA61M 5/14248 of the skin patch typeA61M 5/1454 spring-actuated, e.g. by a ...A61M 5/14566 with a replaceable reservoi...A61M 5/172 electrical or electronic A6...
