Surgery – Truss – Pad
Patent
1980-06-10
1982-04-13
Kamm, William E.
Surgery
Truss
Pad
A61N 136
Patent
active
043242510
ABSTRACT:
A battery monitoring means for an implantable tissue stimulator in which a signal related to the internal impedance of an implanted battery is telemetered to an external receiving means. More specifically, the implanted battery is loaded by a varible load until current flowing through the battery lowers its output voltage until it has a predetermined relationship with respect to a reference voltage. The current flowing through the battery to achieve the predetermined relationship is directly related to the internal impedance of the battery. A voltage related to the value of this current is then telemetered to the external receiving means. In a specific embodiment, the variable load is a field effect transistor (FET) connected as a source follower. The impedance of the FET is controlled by the output of an operational amplifier having as inputs the reference voltage and a voltage related to the output voltage of the battery. The monitoring means operates in a closed-loop servo system manner until the two input voltages to the operational amplifier are equal. The other terminal of the battery is connected to a shunting resistor. Thus the voltage drop across the shunting resistor is related to the current drawn from, and the internal impedance of, the battery. This voltage is telemetered to the external receiving means.
REFERENCES:
patent: 3837348 (1974-09-01), Thaler
patent: 4082097 (1978-04-01), Mann et al.
patent: 4231027 (1980-10-01), Mann et al.
Buskirk John F.
Kamm William E.
Pacesetter Systems Inc.
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