Therapeutic Laser Pulse Duration With Contact Cooling Feedback
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Solution Overview
Problem
Existing dermatological laser systems lack precise control over skin temperature during treatment, leading to inconsistent thermal damage to target and non-target structures, particularly for deeper skin layers, and fail to minimize discomfort and side effects.
Innovation Solution
A therapeutic laser system with a contact cooling element and infrared temperature sensing, allowing real-time temperature monitoring and control of skin temperature during laser pulses, ensuring accurate delivery of energy to target structures while minimizing damage to surrounding tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser pulse duration is extended to achieve adequate thermal damage to deeper skin structures, then treatment efficacy is improved, but thermal damage to non-targeted superficial tissues increases
Solution Approach 1:
The system performs preliminary cooling of the skin surface before laser pulse delivery by activating the contact cooling element. This pre-cooling creates a thermal buffer that protects superficial non-targeted tissues from excessive thermal damage during the extended laser pulse, allowing adequate heating of deeper target structures without compromising superficial tissue safety
Solution Approach 2:
The system uses real-time temperature monitoring via infrared sensing to continuously measure skin temperature during laser treatment. This feedback enables dynamic adjustment of laser parameters and cooling intensity to maintain target tissue at effective temperatures while preventing overheating of non-targeted superficial structures, resolving the contradiction between treatment efficacy and tissue safety
2Object-affected harmful factors
If laser pulse duration is shortened to limit thermal damage to non-targeted tissue, then safety is improved, but thermal damage to deeper target structures is insufficient
Solution Approach 1:
The contact cooling element is activated before laser pulse delivery to establish a controlled thermal environment. This preliminary cooling allows the system to use extended pulse durations for deep target heating while the pre-cooled superficial tissues remain protected, resolving the limitation of short pulse durations
Solution Approach 2:
The system dynamically adjusts laser pulse duration based on real-time temperature feedback from infrared sensing. This dynamic control allows optimization of pulse duration for each treatment phase: longer pulses for deep target heating when cooling is active, and shorter pulses when approaching temperature thresholds, thereby achieving both deep tissue efficacy and superficial tissue safety
3Device complexity
If manual selection of pulse duration and number of pulses is used, then device complexity is reduced, but temperature control precision deteriorates
Solution Approach 1:
The system implements automatic temperature-based feedback control using infrared sensors to monitor skin temperature in real-time. This feedback loop automatically adjusts pulse duration and number of pulses to achieve target temperature thresholds, eliminating the need for manual parameter selection while achieving precise temperature control. The automation handles the complexity internally, providing precision without requiring user expertise
Solution Approach 2:
The system performs self-regulation of treatment parameters based on real-time temperature measurements. The control algorithm automatically determines optimal pulse duration and pulse count to reach target temperatures without user intervention, enabling the system to self-optimize treatment parameters for each patient and treatment area, thereby achieving high precision temperature control
4Measurement precision
If real-time temperature monitoring and dynamic control is implemented, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The system uses an infrared-transparent cooling window as an intermediary that serves dual functions: it allows infrared temperature monitoring through the cooling element while also providing thermal conduction for cooling. This intermediary component enables integration of temperature monitoring and cooling functions without requiring separate complex subsystems, thereby achieving precise temperature control with manageable system complexity
Data Source
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AI summary
Dermatological systems and methods for providing a therapeutic laser treatment wherein the duration of a therapeutic laser pulse is based on one or more determinations of a surface temperature of the skin during the delivery of the pulse. Initiation of the therapeutic laser pulse may be based on sensed skin temperature during a cooling of the skin prior to initiation of the pulse.