Implantable medical device with end-of-life battery detection circuit
First Claim
1. Battery-operated, implantable medical device, comprising a battery, a measuring means for determining a state of charge of the battery by measuring a no-load voltage and an electric load the no-load voltage of the battery having an increased drop-off in a range in which a remaining residual energy is sufficient to maintain operation of the medical device for a minimum period of time required for carrying out a therapeutic process, wherein:
- the battery includes a plurality of cells connected in a series circuit,a first voltage pick-up is arranged on a free anode of the battery for picking up a first potential and a second voltage pick-up is arranged on a free cathode of the battery for picking up a second potential,the electric load is electrically conductively coupled to the first and second voltage pick-ups to be energised by a total voltage drop across the battery,a third voltage pick-up is arranged on an electrode positioned between the free anode and free cathode series circuit in order to pick up a reference potential and to energise the measuring device with a symmetrical voltage supply,the measuring device includes a measuring circuit comprising at least one of a level transducer adding means, the measuring device being electrically conductively coupled at its inputs to the first and second voltage pick-ups for measuring the total voltage drop across the battery,the measuring device further includes a threshold value member with at least one threshold value coupled to an output of the measuring circuit for generating a battery condition signal,the measuring circuit and the threshold value member each has an input for a reference point which is electrically conductively coupled to the third voltage pick-up, andthe measuring circuit and the threshold value member are each electrically conductively coupled to the first and second voltage pick-ups to be energised with a voltage in symmetry with the third voltage pick-up.
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Accused Products
Abstract
A battery-operated implantable medical device comprises a battery, a measuring device for determining the state of charge of the battery through measurement of the no-load voltage, and an electric load. The no-load voltage of the battery has an increased drop in a range in which a remaining residual energy suffices to keep the operation of the device going for a minimum period of time required to carry out a therapeutic process.
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Citations
16 Claims
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1. Battery-operated, implantable medical device, comprising a battery, a measuring means for determining a state of charge of the battery by measuring a no-load voltage and an electric load the no-load voltage of the battery having an increased drop-off in a range in which a remaining residual energy is sufficient to maintain operation of the medical device for a minimum period of time required for carrying out a therapeutic process, wherein:
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the battery includes a plurality of cells connected in a series circuit, a first voltage pick-up is arranged on a free anode of the battery for picking up a first potential and a second voltage pick-up is arranged on a free cathode of the battery for picking up a second potential, the electric load is electrically conductively coupled to the first and second voltage pick-ups to be energised by a total voltage drop across the battery, a third voltage pick-up is arranged on an electrode positioned between the free anode and free cathode series circuit in order to pick up a reference potential and to energise the measuring device with a symmetrical voltage supply, the measuring device includes a measuring circuit comprising at least one of a level transducer adding means, the measuring device being electrically conductively coupled at its inputs to the first and second voltage pick-ups for measuring the total voltage drop across the battery, the measuring device further includes a threshold value member with at least one threshold value coupled to an output of the measuring circuit for generating a battery condition signal, the measuring circuit and the threshold value member each has an input for a reference point which is electrically conductively coupled to the third voltage pick-up, and the measuring circuit and the threshold value member are each electrically conductively coupled to the first and second voltage pick-ups to be energised with a voltage in symmetry with the third voltage pick-up. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification