Hybrid battery power source for implantable medical use
First Claim
1. A hybrid battery power source for implantable medical use, comprising:
- a primary battery;
a secondary battery connected to receive power from said primary battery;
said secondary battery being adapted to power to an implantable medical device designed for high energy electrical stimulation of body tissue for therapeutic purposes; and
a charge control circuit powered by said primary battery and including voltage reference and window comparator means for charging said secondary battery while limiting charge/discharge excursions thereof to control discharge capacity fade and internal resistance increase during service of said secondary battery.
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Accused Products
Abstract
A hybrid battery power source for implantable medical use provides a generally constant low internal resistance during discharge and avoids voltage delays of the type that develop as a result of run down-induced resistance increase in Li/SVO cells. The hybrid battery power source utilizes two batteries or cells, one being a primary cell of relatively high energy density and the other being a secondary cell of relatively low internal resistance that is rechargeable. The primary and secondary cells are connected in a parallel arrangement via a voltage boost/charge control circuit that is powered by the primary cell and adapted to charge the secondary cell while limiting charge/discharge excursions thereof in a manner that optimizes its output for high energy medical device use. The energy storage capacitors of the medical device in which the hybrid battery power source is situated are driven by the secondary cell. The primary cell is used to as an energy source for recharging the secondary cell.
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Citations
30 Claims
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1. A hybrid battery power source for implantable medical use, comprising:
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a primary battery; a secondary battery connected to receive power from said primary battery; said secondary battery being adapted to power to an implantable medical device designed for high energy electrical stimulation of body tissue for therapeutic purposes; and a charge control circuit powered by said primary battery and including voltage reference and window comparator means for charging said secondary battery while limiting charge/discharge excursions thereof to control discharge capacity fade and internal resistance increase during service of said secondary battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable medical device for high energy electrical stimulation of body tissue for therapeutic purposes, comprising:
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a pair of electrical contacts adapted to provide electrical stimulation to body tissue; energy storage means adapted to provide electrical energy to said electrical contacts; switching means adapted to periodically interconnect said energy storage means to said electrical contacts; and a hybrid battery power source adapted to provide power to said energy storage means and including; a primary battery; a secondary battery connected to receive power from said primary battery and to provide power to said energy storage means; and a charge control circuit powered by said primary battery and including voltage reference and window comparator means for charging said secondary battery while limiting charge/discharge excursions thereof to control discharge capacity fade and internal resistance increase during service of said secondary battery. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for powering an implantable medical device designed for high energy electrical stimulation of body tissue for therapeutic purposes, comprising:
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providing a primary battery; providing a secondary battery and connecting it to receive power from said primary power battery; connecting said secondary battery to power said implantable medical device; periodically monitoring the charge state of said secondary battery; and periodically charging said secondary battery by way of said primary battery while limiting charge/discharge excursions of said secondary battery to control discharge capacity fade and internal resistance increase during service of said secondary battery. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification