摘要:
Embodiments of the present invention utilize a closed-loop feedback control system to ensure accurate drug delivery. This control system may, for example, utilize a flow sensor to measure the volume of delivery and an intelligent control algorithm to anticipate and compensate for overdoses and underdoses. Feedback control systems in accordance herewith can be applied to any piston- or plunger-driven pump system utilizing sensors that measure flow directly or indirectly. Depending on the mode of operation, fluid may be dispensed continuously or in discrete pulses, and the manner of adjustment or calibration may be tailored to the operational mode in use.
摘要:
Embodiments of the present invention utilize a closed-loop feedback control system to ensure accurate drug delivery. This control system may, for example, utilize a flow sensor to measure the volume of delivery and an intelligent control algorithm to anticipate and compensate for overdoses and underdoses. Feedback control systems in accordance herewith can be applied to any piston- or plunger-driven pump system utilizing sensors that measure flow directly or indirectly. In some embodiments, adjustments are made based on the flow “tail” that occurs in a piston- or plunger-type pump as relaxation of the plunger material continues to push fluid out of the drug reservoir; this residual flow eventually ceases after the plunger returns to its natural state.
摘要:
Embodiments of the present invention utilize a closed-loop feedback control system to ensure accurate drug delivery. This control system may, for example, utilize a flow sensor to measure the volume of delivery and an intelligent control algorithm to anticipate and compensate for overdoses and underdoses. Feedback control systems in accordance herewith can be applied to any piston- or plunger-driven pump system utilizing sensors that measure flow directly or indirectly. In some embodiments, adjustments are made based on the flow “tail” that occurs in a piston- or plunger-type pump as relaxation of the plunger material continues to push fluid out of the drug reservoir; this residual flow eventually ceases after the plunger returns to its natural state.
摘要:
Implantable reservoir structures include an interior and/or exterior modifying element joined to the interior and/or exterior surface of the membrane defining the reservoir in order to alter one or more physical properties thereof. The physical properties can be mechanical (e.g., material strength, flexibility, shear modulus, Young's modulus, hardness, and/or ductility); optical (e.g., refraction, transparency, transmission spectrum, absorption spectrum, fluorescence spectrum, and/or color); and/or permeability to liquids generally or to a particular type of liquid, solute, or suspended material.
摘要:
Embodiments of the present invention utilize a closed-loop feedback control system to ensure accurate drug delivery. This control system may, for example, utilize a flow sensor to measure the volume of delivery and an intelligent control algorithm to anticipate and compensate for overdoses and underdoses. Feedback control systems in accordance herewith can be applied to any piston- or plunger-driven pump system utilizing sensors that measure flow directly or indirectly. In some embodiments, adjustments are made during a “priming” stage when liquid is pumped through the internal fluid path but does not exit the pump.
摘要:
Drug-delivery devices may utilize electrolysis pumps to push a plunger so as to deliver drug from a reservoir. The volume and/or rate of drug delivery may be monitored based on pressure measurements in the pump chamber. Pressure signatures characteristic of end-of-dose and occlusion events may be used to detect when plunger movement stops.