Abstract: Devices, systems, and techniques for controlling charging power based on a cumulative thermal dose to a patient are disclosed. Implantable medical devices may include a rechargeable power source that can be transcutaneously charged. An external charging device may calculate an estimated cumulative thermal dose delivered to the patient during charging over a predetermined period of time. Based on the estimated cumulative thermal dose, the external charging device may select a power level for subsequent charging of the rechargeable power source. In one example, the charging device may select a high power level when the cumulative thermal dose has not exceeded a thermal dose threshold and select a low power level when the cumulative thermal dose has exceeded the thermal dose threshold.

Abstract: In some examples, a medical device system includes a first implantable medical device. The first implantable medical device (IMD) may comprise circuitry configured to at least one of deliver a therapy to a patient or sense a physiological signal from the patient; generate stimulation deliverable to a patient; a first rechargeable power source; and a secondary coil coupled to the first rechargeable power source, the secondary coil configured to charge the first rechargeable power source via inductive coupling with a primary coil of an external charging device. The medical device system may comprise processing circuitry configured to control charging of the first rechargeable power source based on a charge state of a second rechargeable power source of a second IMD.

Abstract: Devices and methods described herein facilitate rapid wireless recharging, while reducing risk of injury, damage, or discomfort caused by heat generated during recharging. The embodiments described herein are useful in a variety of context, including for IoT devices, personal electronics, electric vehicles, and medical devices, among others.

Abstract: A controller of a memory sub-system can, responsive to providing a command completion signal to a host, mark a portion of a plurality of commands that are addressed to a same logical block of the memory devices, reorder the marked portion of the plurality of commands, wherein write commands from the marked portion of the plurality of commands are given priority over read commands from the marked portion of the plurality of commands, execute a newest write command from the marked portion of the plurality of commands prior to executing read commands, addressed to the same logical block, from the marked portion of the plurality of commands, and execute read commands from the marked portion of the plurality of commands in on an order in which the read commands were received and after the execution of the newest write command, wherein the read commands are executed responsive to an execution of the newest write command.

Abstract: Devices, systems, and techniques are described to detect when a power transmitting and receiving system is in an inefficient position, which may cause a thermal response that less desirable than a more efficient position. The system may power transmitting device configured to wirelessly transfer electromagnetic energy to a power receiving device. Processing circuitry of the system may compute a target output power deliverable by the power transmitting device for a first duration and control the power transmitting device to output the target output power based in part on a heat limit. The processing circuitry may further calculate an energy transfer efficiency to the power receiving unit, update an adjustment factor based on the calculated energy transfer efficiency, and apply the adjustment factor to the heat limit for a subsequent duration.

Abstract: Devices, systems, and techniques for monitoring the temperature of a device used to charge a rechargeable power source are disclosed. Implantable medical devices may include a rechargeable power source that can be transcutaneously charged. The temperature of an external charging device and/or an implantable medical device may be monitored to control the temperature exposure to patient tissue. In one example, a temperature sensor may sense a temperature of a portion of a device, wherein the portion is non-thermally coupled to the temperature sensor. A processor may then control charging of the rechargeable power source based on the sensed temperature.

Abstract: Devices, systems, and techniques for monitoring the temperature of a device such as an implantable medical device is disclosed. An implantable medical device includes a housing with at least one support disposed within the housing, a temperature sensor thermally coupled to the interior surface of the housing, wherein the temperature sensor is disposed within the housing and configured to sense a temperature of a portion of the housing. At least one physically compliant material is disposed between the at least one support and the temperature sensor, where the physically compliant material is configured to provide a physical bias against the temperature sensor and towards the interior surface of the housing.

Abstract: Devices, systems, and techniques are described for use in recharging a power source of a cranially mounted implantable medical device. In one example, a wearable medical device includes a flexible body configured to cover at least a portion of a scalp of a head of a patient. A securing member is connected to the flexible body and configured to extend around a circumference of the head to stabilize the flexible body with respect to the scalp of the patient. A fixation member is configured to mount to a location of the flexible body and couple the flexible body to a recharge coil that is configured to recharge the power source of the cranially-mountable implantable medical device.

Abstract: Techniques for estimating the temperature of an external portion of a medical device are described. In an example, processing circuitry may determine a temperature sensed by at least one temperature sensor of an internal portion of the device, and determine, based on an algorithm that incorporates the temperature of the internal portion of the device, an estimated temperature of a second portion of the device, wherein the algorithm is representative of an estimated temperature difference between the first portion of the device and the second portion of the device based at least in part on a dynamic transfer function that operates in a time-domain.

Abstract: In some examples, an implantable medical device (IMD) including a hermetically sealed housing that is configured to enclose internal components. The internal components may include stimulation circuitry, processing circuitry configured to control the stimulation circuitry to deliver electrical stimulation using one or more leads received by the housing, telemetry circuitry, and a rechargeable power source. The IMD may also include a coil configured to at least one of receive energy to recharge the rechargeable power source or receive and/or transmit signals for wireless telemetry with another device, wherein the implantable medical device is configured to mount to a cranium of a patient, and wherein the coil is coiled about an axis that is approximately orthogonal to a major surface of the IMD.

Abstract: A system includes a storage system and circuitry coupled to the storage system. The circuitry is configured to perform operations comprising attempting a communication of a first completion associated with a first transaction processed by the storage system. The operations further comprise, responsive to failure of the communication of the first completion, storing the first completion in a local memory of the storage system and subsequently attempting a communication of the first completion from the local memory.

Abstract: This disclosure describes devices, systems, and techniques for recharging power sources using RF energy received by one or more antennae. In one example, an implantable medical device includes a rechargeable power supply and an antenna configured to receive radio frequency (RF) energy having one or more frequencies within at least one of a first range from 1 MHz to 20 MHz or a second range from 100 MHz to 700 MHz. The implantable medical device may also include charging circuitry configured to convert the RF energy to a direct current (DC) power and charge the rechargeable power supply with the DC power.

Abstract: Devices and methods described herein facilitate rapid wireless recharging, while reducing risk of injury, damage, or discomfort caused by heat generated during recharging. The embodiments described herein are useful in a variety of context, including for IoT devices, personal electronics, electric vehicles, and medical devices, among others.

Abstract: Devices, systems, and techniques for monitoring the temperature of a device used to charge a rechargeable power source are disclosed. Implantable medical devices may include a rechargeable power source that can be transcutaneously charged. The temperature of an external charging device and/or an implantable medical device may be monitored to control the temperature exposure to patient tissue during a charging session used to recharge the rechargeable power source. In one example, a temperature sensor may sense a temperature of an internal portion of a device, wherein the housing of the device is not directly thermally coupled to the temperature sensor. A temperature for the housing of the device may then be estimated based on the sensed temperature provided by the non-thermally coupled temperature sensor. A processor may then control charging of the rechargeable power source based on the determined temperature for the housing.

Abstract: A controller of a memory sub-system can, responsive to providing a command completion signal to a host, mark a portion of a plurality of commands that are addressed to a same logical block of the memory devices, reorder the marked portion of the plurality of commands, wherein write commands from the marked portion of the plurality of commands are given priority over read commands from the marked portion of the plurality of commands, execute a newest write command from the marked portion of the plurality of commands prior to executing read commands, addressed to the same logical block, from the marked portion of the plurality of commands, and execute read commands from the marked portion of the plurality of commands in on an order in which the read commands were received and after the execution of the newest write command, wherein the read commands are executed responsive to an execution of the newest write command.

Abstract: Devices, systems, and techniques for controlling charging power transmitted to an implantable medical device during a recharging process based on patient activity are disclosed. Various example techniques include a method comprising receiving, by processing circuitry, an activity signal generated by an implantable medical device and indicative of an activity level of a patient during charging of a rechargeable power source of the implantable medical device implanted in the patient, determining, by the processing circuitry and based on the activity signal, a patient status for the patient during charging of the rechargeable power source, and controlling, by the processing circuitry and based on the patient status, charging of the rechargeable power source of the implantable medical device.

Abstract: An implantable medical system includes an implantable medical device and a external charger. The implantable medical device includes a rechargeable power source, electronic components coupled to the rechargeable power source to deliver a therapy to or monitor a parameter of a patient, and a recharge system operably coupled to the rechargeable power source including a secondary coil to receive power via an inductive power transfer. The external charger includes a housing forming an internal compartment, recharger electronic components disposed on a printed circuit board assembly in the internal compartment, and a recharge coil assembly disposed within the internal compartment, the recharge coil assembly including a recharge coil to provide power to the secondary coil via the inductive power transfer and a flux guide having a ferrite sheet disposed between the recharge coil and the printed circuit board assembly.

Abstract: An implantable medical device (IMD) includes a housing that is configured to enclose internal components including at least a processor and a power source. The housing defines two major surfaces that are generally parallel to each other and one or more channels that are each configured to receive a lead and electrically couple the respective lead to the internal components, where each of the channels extend substantially straight in to the housing along an axis generally parallel to the two major surfaces. The housing may be configured to be mounted to a cranium of a patient such that at least one of the two major surfaces approximates a curvature of the cranium. The IMD may include one or more funneling walls that define a rounded and smooth transition from a sidewall of the housing to a surface that defines one or more mouths to the channels.

Abstract: Devices, systems, and techniques for monitoring the temperature of a device used to charge a rechargeable power source are disclosed. Implantable medical devices may include a rechargeable power source that can be transcutaneously charged. The temperature of an external charging device and/or an implantable medical device may be monitored to control the temperature exposure to patient tissue. In one example, a temperature sensor may sense a temperature of a portion of a device, wherein the portion is non-thermally coupled to the temperature sensor. A processor may then control charging of the rechargeable power source based on the sensed temperature.

Abstract: Devices, systems, and techniques for monitoring the temperature of a device used to charge a rechargeable power source are disclosed. Implantable medical devices may include a rechargeable power source that can be transcutaneously charged. The temperature of an external charging device and/or an implantable medical device may be monitored to control the temperature exposure to patient tissue during a charging session used to recharge the rechargeable power source. In one example, a temperature sensor may sense a temperature of an internal portion of a device, wherein the housing of the device is not directly thermally coupled to the temperature sensor. A temperature for the housing of the device may then be estimated based on the sensed temperature provided by the non-thermally coupled temperature sensor. A processor may then control charging of the rechargeable power source based on the determined temperature for the housing.