Rechargeable body tissue stimulator with back-up battery and pulse generator
First Claim
1. An implantable stimulator for applying electrical stimulation to body tissue of a patient comprising,means constituting a source of operating energy,generator means operably connected to receive operating energy from said source means for generating said electrical stimulation,said generator means including a circuit means forming a first primary generator of electrical stimulation and a circuit means forming a second stand-by generator of back-up electrical stimulation,circuit means operably connected to said first primary and second stand-by generators for applying said electrical stimulation, andcontrol means responsive to the output of said first primary generator for selectively rendering said second stand-by generator effective to apply said back-up stimulation if said first primary is not properly generating said electrical stimulation.--
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Abstract
An implanted tissue stimulator apparatus includes circuitry, powered by an implanted rechargeable battery, to produce electrical stimulation and apply it to selected body tissue. The condition of the rechargeable battery is monitored continuously and if the cell fails or its voltage drops below a preselected level, the stimulator reverts to a stand-by power source provided by a battery having an extremely long shelf-life. A back-up pulse generator is also provided and the control logic circuitry within the implanted stimulator monitors the operation of the pulse generator, in addition to the condition of the rechargeable battery, and if faulty operation of the pulse generator is detected the logic circuitry automatically switches to the back-up pulse generator in order to maintain adequate tissue stimulation.
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Citations
8 Claims
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1. An implantable stimulator for applying electrical stimulation to body tissue of a patient comprising,
means constituting a source of operating energy, generator means operably connected to receive operating energy from said source means for generating said electrical stimulation, said generator means including a circuit means forming a first primary generator of electrical stimulation and a circuit means forming a second stand-by generator of back-up electrical stimulation, circuit means operably connected to said first primary and second stand-by generators for applying said electrical stimulation, and control means responsive to the output of said first primary generator for selectively rendering said second stand-by generator effective to apply said back-up stimulation if said first primary is not properly generating said electrical stimulation.--
Specification