INFUSION PUMPS
2 Assignments
0 Petitions
Accused Products
Abstract
Ambulatory infusion pumps, pump assemblies, cartridges, baseplates, cannulas, insertion tools, and related components as well as combinations thereof and related methods.
64 Citations
392 Claims
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1-345. -345. (canceled)
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346. An infusion pump assembly for use with a medicament cartridge including a reservoir and a plunger, the assembly comprising:
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a housing including a cartridge receiving area; a plunger pusher in the housing and adapted to move in and out of the cartridge receiving area; a stepper motor, having a shaft and coils, operatively connected to the pusher; an encoder, operably connected to the motor shaft, that generates encoder output representative of shaft position; a battery in the housing and operatively connected to the motor; an analog-to-digital (A/D) converter that generates ND converter output that is a digital representation of battery voltage; and a controller that (a) operates through a driver circuit to control the operation of the motor and to pulse-width modulate energy from the battery applied to the motor coils, (b) reads the encoder output and (c) reads the ND converter output. - View Dependent Claims (347, 348, 350, 351, 352, 353, 354, 355, 356)
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349. (canceled)
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357-375. -375. (canceled)
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376. An infusion pump assembly, comprising:
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a housing having therein a medicament reservoir and a plunger; a plunger pusher associated with the plunger; a drive mechanism, with a stepper motor and an encoder, that drives the plunger pusher, and a controller operably connected to the motor and encoder; the controller being configured to cause the motor to propel the pusher against the plunger according to a medicament dispensing program having a plurality of dispensing operations; and the controller configured to, for at least one of the dispensing operations, cause the motor to stop from a pusher propelling velocity by slowly decreasing the frequency of the waveform delivered to the motor to maintain constant positive control of the motor and thereby to precisely control how many turns the motor makes and thus the precise distance the plunger pusher advances before stopping to provide accurate controlled medicament dispensing from the medicament reservoir.
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377. (canceled)
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378. A method of operating an infusion apparatus including a barrel defining a medicament reservoir, a plunger with at least one seal in the barrel such that there is static and dynamic friction between the barrel and the plunger, a plunger pusher and a motor that drives the plunger pusher by providing torque, the method comprising the steps of:
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propelling the pusher relative to the plunger with the motor; and controlling the motor torque such that the torque is continuously within a range having a lower limit that is sufficient to overcome cartridge break force and running force to move the plunger and an upper limit that is low enough so as to not cause leakage past the seal of the plunger due to excessive pressure in the reservoir. - View Dependent Claims (379, 380, 383, 385, 386, 387, 388, 391)
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381-382. -382. (canceled)
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384. (canceled)
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389-390. -390. (canceled)
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392-619. -619. (canceled)
Specification