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 Implantable Medical Device (IMD) operable in a low power mode and a higher (more consumptive of battery capacity) power mode, and having a battery power source, means to measure the voltage of the battery power source and means to condition the device to a low power op

[ What is claimed is:] [1.] An Implantable Medical Device (IMD) operable in a low power mode and a higher (more consumptive of battery capacity) power mode, and having a battery power source, means to measure the voltage of the battery power source and means to condition the device to a low power operating mode when the battery power source as measured by said means to measure indicates a voltage below a threshold voltage, further comprising a means for resetting said IMD automatically to restore said higher power mode of operation, said means for resetting said IMD including a checking means to prevent resetting if a user has programmed any function of the IMD.