Implanted pulse generators with reduced power consumption via signal strength-duration characteristics, and associated systems and methods are disclosed. A representative method for treating a patient in accordance with the disclosed technology includes receiving an input corresponding to an available voltage for an implanted medical device and identifying a signal delivery parameter value of an electrical signal based on a correlation between values of the signal delivery parameter and signal deliver amplitudes. The signal deliver parameter can include at least one of pulse width or duty cycle. The method can further include delivering an electrical therapy signal to the patient at the identified signal delivery parameter value using a voltage within a margin of the available voltage.

In some examples, determining an estimated remaining longevity of a power source of an implantable medical device comprises determining values of one or more parameters of the power source and one or more operational parameters of the implantable medical device; calculating, based on at least some of the determined parameter values, a first estimated duration until one of the determined parameters of the power source reaches a pre-recommended replacement time (pre-RRT) threshold and adding a timer duration to determine a first estimated longevity value; calculating, based on at least some of the determined parameter values, a second estimated duration until one of the determined parameters of the power source reaches a recommended replacement time (RRT) backup threshold as a second estimated longevity value; determining the estimated remaining longevity based on the two estimated longevity values; and indicating the determined estimated remaining longevity.

Methods and devices are provided for managing anti-tachycardia pacing therapy delivered by an implantable medical device (IMD). The methods and devices detect events from cardiac signals sensed at electrodes of the IMD. The cardiac signals represent a ventricular tachycardia (VT) episode that includes at least a select number of VT events having a corresponding VT cycle length. The methods and devices analyze the VT cycle length to define an anti-tachycardia pacing (ATP) therapy that includes a first coupling interval and deliver a first ATP pulse that is spaced the first coupling interval after a reference refractory VT event sensed at the electrodes. The methods and devices deliver a second ATP pulse following the first ATP pulse by a non-stimulation segment that is at least one and three-quarters (1.75) times a projected VT cycle length.

A method of operating an implantable pulse generator implanted in a patient includes determining, by a processor of the implantable pulse generator, that the patient has awoken; determining, by the processor of the implantable pulse generator, an average daily voltage depletion of a battery in the implantable pulse generator per day over a period of time in response to the patient being awake; determining, by the processor of the implantable pulse generator, a current voltage of the battery in the implantable pulse generator; determining, by the processor of the implantable pulse generator, a depletion voltage of the battery of the implantable pulse generator associated with the battery being depleted; and transmitting, from the implantable pulse generator to an electronic device remote from the implantable pulse generator, an alert in response to the current voltage being less than a sum of the average voltage depletion and the depletion voltage.

Devices, systems, and methods are disclosed for relaying information from a cardiac pacemaker to an external device. Logic on the pacemaker modulates a heartbeat clock of the pacemaker to encode information onto a blood pressure sequence by adding or subtracting a small subinterval to or from a pulse repetition interval of the pacemaker. A muscle stimulator beats the heart according to the modulated sequence. A monitoring device external to the body monitors the blood pressure to retrieve the encoded information, or message. The encoded information is then decoded to determine the information in the message. This information may concern the pacemaker as well as other devices within the body that communicate with the pacemaker such as blood monitors, etc. Since the message is conveyed via simple modulation of the heart beat intervals, no separate transmitter is required in the pacemaker which would otherwise increase cost and decrease battery life.

Techniques for minimizing rate of depletion of a non-rechargeable power source, to extend the operational lifetime of an implantable medical device that includes the non-rechargeable power source, by enforcing operational-mode-specific communication protocols whereby inter-device communication between the implantable medical device and another implantable medical device is such that level of power draw from the non-rechargeable power source by the implantable medical device is less than level of power draw from the rechargeable power source by the another implantable medical device for the implantable medical devices to engage in communication with each other.

A system and method is provided for reliably indicating that an implantable medical device is in need of replacement. An implantable medical device includes a battery and a replacement indicator timer. The battery provides power to the implantable medical device. The replacement indicator timer counts a replacement time period to a determined replacement date for the implantable medical device. The replacement indicator timer starts the counting when an operational characteristic of the battery reaches a selected value.

A cardiac pacing system comprising one or more leadless cardiac pacemakers configured for implantation in electrical contact with a cardiac chamber and configured to perform cardiac pacing functions in combination with a co-implanted implantable cardioverter-defibrillator (ICD). The leadless cardiac pacemaker comprises at least two leadless electrodes configured for delivering cardiac pacing pulses, sensing evoked and/or natural cardiac electrical signals, and bidirectionally communicating with the co-implanted ICD.

Systems and methods for selecting one or more sites at or within at least one heart chamber for cardiac stimulation are disclosed. The system can include a physiologic sensor circuit to sense physiologic signals at two or more candidate stimulation sites. The system can generate respective activation timing indicators corresponding to the two or more candidate stimulation sites, and detect MI indicators indicating the presence of, or spatial proximity of each of the two or more candidate stimulation sites to a MI tissue. The system can use the activation timing indicators and the MI indicators to select at least one target stimulation site or to determine an electrostimulation vector. The system can display the selected target stimulation site to a user, or deliver electrostimulation to the patient at the target stimulation site or according to the determined electrostimulation vector.

Devices, systems, and methods are disclosed for relaying information from a cardiac pacemaker to an external device. Logic on the pacemaker modulates a heartbeat clock of the pacemaker to encode information onto a blood pressure sequence by adding or subtracting a small subinterval to or from a pulse repetition interval of the pacemaker. A muscle stimulator beats the heart according to the modulated sequence. A monitoring device external to the body monitors the blood pressure to retrieve the encoded information, or message. The encoded information is then decoded to determine the information in the message. This information may concern the pacemaker as well as other devices within the body that communicate with the pacemaker such as blood monitors, etc. Since the message is conveyed via simple modulation of the heart beat intervals, no separate transmitter is required in the pacemaker which would otherwise increase cost and decrease battery life.