A device for electrically stimulating one or more anatomical target sites in a patient and for use in the treatment of a plurality of biological conditions of the patient. The device has a pulse generator providing electrical stimulation to the anatomical target sites; a power source for powering the pulse generator; stimulator electrodes connected to the pulse generator for stimulating the anatomical target sites; one or more optional sensing electrodes for monitoring physiological parameters with reference to the anatomical target sites; and a microprocessor programmed to vary a plurality of therapy protocol parameters governing the electrical stimulation to thereby modify operational life parameters of the power source.

Processing circuitry associated with an implantable medical device (IMD) may store a value of a shared voltage as a battery voltage threshold. A shared voltage is a voltage magnitude at which the voltage curves for the population of batteries converge at a particular percent depth of discharge (% DoD). The shared voltage is a consistent voltage magnitude across the population of batteries. Based on the indication that the battery has reached the shared voltage, the processing circuitry may determine any or all of: the battery % DoD level, the amount, e.g., the percent of electrical energy remaining in the battery and the amount of time remaining before the battery reaches its end of service life. In some examples, the processing circuitry may output an elective replacement indicator based on the calculated amount of time remaining before the battery reaches its end of service life.

An implantable system for stimulating a human/animal heart, comprising a processor, a memory unit, a stimulation unit, a sensing unit, and a diagnostic unit. The system carries out: a) detecting whether at least one malfunction state of the system is present; b) checking whether an electrode provided for stimulating a His bundle of a heart is connected to the stimulation unit; c) switching an operating state of the system into a safety mode when a malfunction state was detected, the safety mode selected from a first safety mode and a second safety mode, wherein i) the first safety mode is selected when no electrode provided for stimulating a His bundle of a heart is connected to the stimulation unit, and ii) the second safety mode is selected when an electrode provided for stimulating a His bundle of a heart is connected to the stimulation unit.

Provided herein are methods of treating a patient comprising providing a medical apparatus comprising an external system and an implantable system, implanting the implantable system, and delivering at least one of power or data to the implantable system with the external system. The external system comprises: at least one external antenna configured to transmit a first transmission signal to the implantable system; an external transmitter configured to drive the at least one external antenna; an external power supply; and an external controller. The implantable system comprises: at least one implantable antenna configured to receive the first transmission signal from the first external device; an implantable receiver; at least one implantable functional element configured to interface with the patient; an implantable controller; an implantable energy storage assembly; and an implantable housing surrounding at least the implantable controller and the implantable receiver. Medical apparatus are also provided.

An implantable medical device is configured determine a numerical value of a variable that is monitored by the implantable medical device and convert the numerical value to a data sequence of modulated electrical stimulation rate intervals. The implantable medical device delivers electrical stimulation pulses according to the data sequence of modulated stimulation rate intervals to cause a modulated rate of activation of excitable tissue of a patient corresponding to the modulated stimulation rate intervals. The modulated rate of activation is detectable by a rate monitor for demodulation to the numerical value of the monitored variable data value. In some examples, the implantable medical device is a pacemaker delivering cardiac pacing pulses according to modulated pacing rate intervals to cause a modulated heart rate of the patient detectable by a heart rate monitor for demodulation to the numerical value of the monitored variable.

An implantable medical device is configured determine a numerical value of a variable that is monitored by the implantable medical device and convert the numerical value to a data sequence of modulated electrical stimulation rate intervals. The implantable medical device delivers electrical stimulation pulses according to the data sequence of modulated stimulation rate intervals to cause a modulated rate of activation of excitable tissue of a patient corresponding to the modulated stimulation rate intervals. The modulated rate of activation is detectable by a rate monitor for demodulation to the numerical value of the monitored variable data value. In some examples, the implantable medical device is a pacemaker delivering cardiac pacing pulses according to modulated pacing rate intervals to cause a modulated heart rate of the patient detectable by a heart rate monitor for demodulation to the numerical value of the monitored variable.

A method for determining usable capacity of a battery of an active implantable medical device comprising a radiofrequency (RF) communication unit for transmitting data by RF over a communication period, wherein the usable capacity of the battery enables the active implantable medical device to transmit data by RF via the RF communication unit. The method includes measuring a value for the voltage of the battery which is representative of an instantaneous voltage drop of the battery as a result of a current draw on the battery, comparing the voltage of the battery with a predetermined threshold voltage VBS, and transmitting an alert message to a second device when the measured voltage of the battery crosses the predetermined threshold voltage.

An implant system includes an implant device configured to generate a stimulation signal for a user using a power manager according to an operation mode based on biometric information of the user, and a wake-up device configured to switch the operation mode based on either one or both of an energy supply received through an external energy source different from the power manager and a result of counting a timer.

An implant system includes an implant device configured to generate a stimulation signal for a user using a power manager according to an operation mode based on biometric information of the user, and a wake-up device configured to switch the operation mode based on either one or both of an energy supply received through an external energy source different from the power manager and a result of counting a timer.

A state of health of a battery may be determined based on a voltage of the battery and a rate of voltage change of the battery. A first voltage of a battery may be measured, and it may be determined that the first voltage is equal to or greater than a voltage threshold level. In response, a second voltage of the battery may be measured at a conclusion of a predetermined time period. Such predetermined time period may begin when the first voltage is measured. The rate of voltage change may be determined based on the first voltage, the second voltage, and the predetermined time period.