# US 12,772,357 B2 · Age-compensated driving of light-emitting diodes of a lighting strip of a medical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,772,357 B2 - Document ID: US12772357B2 - Status: Granted - Kind: B2 - Application number: 19/041,088 - Filed: 2025-01-30 - Published: 2025-07-31 - Granted: 2026-10-20 - Earliest claimed: 2024-01-31 - Assignees: Siemens Healthineers AG - Applicants: Siemens Healthineers AG - Inventors: Andreas Troeltzsch; Harald Karl; Arne Harriers - Web page: https://patentgrep.com/patent/US12772357B2 ## CPC - H05B 45/50: responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A medical device includes a lighting strip having a plurality of individually drivable light-emitting diodes, and a controller for the light-emitting diodes. The controller includes an interface configured to dynamically receive a request for an illumination state including a partial illumination state for each of the light-emitting diodes. The controller is configured to: individually determine respective drive levels for the light-emitting diodes such that an actual illumination state of a respective light-emitting diode corresponds to a respective partial illumination state; and drive the light-emitting diodes in accordance with the respective drive levels determined. When determining the respective drive levels the controller takes into account aging states of the light-emitting diodes. ## Claims ### Claim 1 An operating method for a medical device including a lighting strip having a plurality of individually drivable light-emitting diodes and a controller for the light-emitting diodes, the operating method comprising: dynamically receiving, at the controller via an interface, a request for an illumination state, which includes a partial illumination state for each of the light-emitting diodes; individually determining, by the controller, respective drive levels for the light-emitting diodes such that an actual illumination state of a respective light-emitting diode corresponds to a respective partial illumination state; and driving, by the controller, the light-emitting diodes in accordance with the respective drive levels determined, wherein in determining the respective drive levels, the controller takes into account aging states of the light-emitting diodes. ### Claim 2 (depends on 1) The operating method as claimed in claim 1, further comprising: reading out, by the controller, the aging states of the light-emitting diodes from a memory arranged on the lighting strip; determining changes in the aging states of the light-emitting diodes at least as a function of the respective drive levels of the light-emitting diodes; updating the aging states of the light-emitting diodes in accordance with the changes in the aging states; and storing the updated aging states in the memory. ### Claim 3 (depends on 2) The operating method as claimed in claim 2, wherein the determining changes in the aging states takes into account time-invariant parameters of the light-emitting diodes, the time-invariant parameters defined on a one-time only basis. ### Claim 4 (depends on 1) The operating method as claimed in claim 1, wherein the light-emitting diodes are combined into groups of light-emitting diodes, wherein the light-emitting diodes of a respective group are arranged in a common housing, and wherein the light-emitting diodes of the respective group emit light at different wavelengths from one another. ### Claim 5 (depends on 1) The operating method as claimed in claim 1, further comprising: increasing a respective drive level of a respective light-emitting diode for a constant partial illumination state as an aging state of the respective light-emitting diode advances. ### Claim 6 (depends on 5) The operating method as claimed in claim 5, wherein the respective drive level is limited to a maximum value irrespective of the aging state of the respective light-emitting diode, and as the respective drive level of the respective light-emitting diode at the beginning of aging of the respective light-emitting diode, a drive level below the maximum value is determined when the respective partial illumination state assumes a further maximum value. ### Claim 7 A medical device, comprising: a lighting strip including a plurality of individually drivable light-emitting diodes; and a controller for the light-emitting diodes, the controller having an interface configured to dynamically receive a request for an illumination state including a partial illumination state for each of the light-emitting diodes; and wherein the controller is configured to individually determine respective drive levels for the light-emitting diodes such that an actual illumination state of a respective light-emitting diode corresponds to a respective partial illumination state, and drive the light-emitting diodes in accordance with the respective drive levels determined, wherein when determining the respective drive levels the controller takes into account aging states of the light-emitting diodes. ### Claim 8 (depends on 7) The medical device as claimed in claim 7, wherein the controller is configured to read out the aging states of the light-emitting diodes from a memory arranged on the lighting strip, determine changes in the aging states of the light-emitting diodes at least as a function of the respective drive levels of the light-emitting diodes, update the aging states of the light-emitting diodes in accordance with the changes in the aging states, and store the updated aging states in the memory. ### Claim 9 (depends on 8) The medical device as claimed in claim 8, wherein the controller has a memory for time-invariant parameters of the light-emitting diodes, wherein the time-invariant parameters are defined on a one-time only basis, and wherein the controller is configured to take the time-invariant parameters of the light-emitting diodes into account when determining the changes in the aging states. ### Claim 10 (depends on 7) The medical device as claimed in claim 7, wherein the light-emitting diodes are combined into groups of light-emitting diodes, wherein the light-emitting diodes of a respective group are arranged in a common housing, and wherein the light-emitting diodes of the respective group are configured to emit light in different wavelengths from one another. ### Claim 11 (depends on 7) The medical device as claimed in claim 7, wherein the controller is configured to increase the respective drive level of the respective light-emitting diode for a constant partial illumination state as the aging state of the respective light-emitting diode advances. ### Claim 12 (depends on 11) The medical device as claimed in claim 11, wherein the respective partial illumination state is limited to a maximum value, and the controller is configured to limit the respective drive level of the respective light-emitting diode to a maximum value irrespective of the aging state of the respective light-emitting diode, and as the respective drive level of the respective light-emitting diode at the beginning of aging of the respective light-emitting diode, determine a drive level below the maximum value when the respective partial illumination state assumes a further maximum value. ### Claim 13 (depends on 7) The medical device as claimed in claim 7, wherein the lighting strip is supplied with electrical power via a power supply device, and wherein the lighting strip is assigned a power limiting device configured to limit the electrical power fed to the lighting strip via the power supply device to a maximum value irrespective of a requested illumination state. ### Claim 14 (depends on 2) The operating method as claimed in claim 2, wherein the light-emitting diodes are combined into groups of light-emitting diodes, wherein the light-emitting diodes of a respective group are arranged in a common housing, and wherein the light-emitting diodes of the respective group emit light at different wavelengths from one another. ### Claim 15 (depends on 14) The operating method as claimed in claim 14, further comprising: increasing a respective drive level of a respective light-emitting diode for a constant partial illumination state as an aging state of the respective light-emitting diode advances. ### Claim 16 (depends on 2) The operating method as claimed in claim 2, further comprising: increasing a respective drive level of a respective light-emitting diode for a constant partial illumination state as an aging state of the respective light-emitting diode advances. ### Claim 17 (depends on 8) The medical device as claimed in claim 8, wherein the light-emitting diodes are combined into groups of light-emitting diodes, wherein the light-emitting diodes of a respective group are arranged in a common housing, and wherein the light-emitting diodes of the respective group are configured to emit light in different wavelengths from one another. ### Claim 18 (depends on 17) The medical device as claimed in claim 17, wherein the controller is configured to increase the respective drive level of the respective light-emitting diode for a constant partial illumination state as the aging state of the respective light-emitting diode advances. ### Claim 19 (depends on 8) The medical device as claimed in claim 8, wherein the controller is configured to increase the respective drive level of the respective light-emitting diode for a constant partial illumination state as the aging state of the respective light-emitting diode advances. ### Claim 20 (depends on 8) The medical device as claimed in claim 8, wherein the lighting strip is supplied with electrical power via a power supply device, and wherein the lighting strip is assigned a power limiting device configured to limit the electrical power fed to the lighting strip via the power supply device to a maximum value irrespective of a requested illumination state.