초록 ▼

An automatic, body-implantable medical device having at least two modes of operation is disclosed. The device is provided with circuitry for automatically detecting when the device has been implanted in a patient, so that the device can automatically switch from a first mode to a second mode of oper

An automatic, body-implantable medical device having at least two modes of operation is disclosed. The device is provided with circuitry for automatically detecting when the device has been implanted in a patient, so that the device can automatically switch from a first mode to a second mode of operation upon implantation. In one embodiment, the first mode is a power conserving mode in which one or more non-essential sub-systems of the device are disabled. Prior to detection of implant, at least two conditions of the device known to reflect whether the device has been implanted are monitored. After implant has been detected, situations in which power to the device is disrupted and then restored will cause the device to enter a predefined "power-on-reset" mode of operation. Prior to detection of implant, however, such conditions do not result in the device entering the power-on-reset mode, or this mode is reset. An Elective Replacement Indicator mode is also used which is based on measured impedance against a target battery impedance. When the measured battery impedance reaches the target level, the voltage of the battery that precipitates an ERI condition is modified.

대표청구항 ▼

[ What is claimed is:] [1.] An IMD having an automatically adjustable value for determining ERI condition of a battery power source such that said adjustable value is automatically adjusted by a value changing processor responsive to a measured level of a state of said battery power source, said mea

[ What is claimed is:] [1.] An IMD having an automatically adjustable value for determining ERI condition of a battery power source such that said adjustable value is automatically adjusted by a value changing processor responsive to a measured level of a state of said battery power source, said measured level generated by a battery power source measuring circuit connected to said battery power source in said IMD.