Implantable drug delivery device with programmable rate capacitor charge control
First Claim
1. An implantable medical device comprising:
- an electromagnetic pump having a coil that can be energized to produce a pump stroke;
a power source;
a storage capacitor for storing electrical energy from the power source and for delivering stored electrical energy to the coil; and
a charge control system for controlling charging of the storage capacitor as a function of sensed power source voltage, and sensed charging current.
1 Assignment
0 Petitions
Accused Products
Abstract
An implantable drug delivery device includes a pump motor that is asserted by drive currents from a storage capacitor. A programmable rate charge control delivers charging current from a battery to the storage capacitor based upon a programmable charge rate value, a minimum battery voltage value, sensed charging current, and sensed battery voltage. When sensed battery voltage droops to below a threshold value, the charge control reduces the charging rate value until other electrical loads within the drug device have been serviced and battery voltage is restored. The charge control also monitors capacitor voltage and provides a charge complete signal to a motor control, which then connects the pump motor to the storage capacitor to produce a pump stroke. Efficiency of charging is enhanced by controlling the charging at a programmable substantially constant rate.
55 Citations
57 Claims
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1. An implantable medical device comprising:
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an electromagnetic pump having a coil that can be energized to produce a pump stroke; a power source; a storage capacitor for storing electrical energy from the power source and for delivering stored electrical energy to the coil; and a charge control system for controlling charging of the storage capacitor as a function of sensed power source voltage, and sensed charging current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An implantable drug delivery device comprising:
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a battery; a storage capacitor; a pump motor; a charge control system for charging the storage capacitor from the battery at a substantially constant programmable rate with a charging current; and a motor control circuit for delivering electrical energy stored in the storage capacitor to the pump motor to produce a pump stroke. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. An implantable drug delivery device comprising:
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a battery; an electromechanical pump motor; a motor driver including a storage capacitor, the motor driver charging the storage capacitor from the battery at a programmable substantially constant rate with a charging current and driving the pump motor with electrical energy from the storage capacitor. - View Dependent Claims (41, 42, 43, 44, 45, 46, 57)
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47. A method of operating a drug delivery device, the method comprising:
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charging a storage capacitor from a battery at a programmable substantially constant rate with a charging current; and delivering stored electrical energy from the storage capacitor to a pump motor. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification