Interstitial Laser Therapy Device with Integrated Optical Temperature Sensor
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Solution Overview
Problem
Current interstitial laser therapy methods lack reliable and rapid temperature monitoring, leading to potential tissue damage due to the lack of precise temperature control, as existing solutions like MRI scanners are expensive, bulky, and provide indirect, less accurate measurements.
Innovation Solution
A device for interstitial laser therapy that incorporates an optical waveguide with an optical diffuser and a temperature sensor, allowing for direct and precise temperature measurement, enabling real-time feedback and adjustment of the optical output power to prevent tissue charring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MRI scanners are used to estimate internal temperatures, then temperature monitoring capability is provided, but the devices are expensive, bulky, and provide indirect measurements with low accuracy
Solution Approach 1:
The patent replaces complex MRI scanning systems with a simple optical fiber-based temperature sensor that directly measures temperature at the treatment site. The sensor uses optical properties (refractive index changes) to detect temperature, substituting bulky mechanical imaging equipment with a minimally invasive optical probe.
Solution Approach 2:
The patent creates a simplified copy of temperature measurement capability by using optical fiber sensors that replicate the temperature detection function without requiring the complex MRI infrastructure. The sensor provides direct temperature readings comparable to what MRI would estimate, but with much simpler hardware.
2Object-affected harmful factors
If cooling systems are added to minimize tissue charring, then tissue damage risk is reduced, but the overall size of the accessing cannula increases, inducing greater trauma to the patient
Solution Approach 1:
The patent implements real-time temperature feedback using an optical fiber sensor positioned at the treatment site. The sensor continuously monitors temperature and provides immediate feedback to control the laser power, allowing precise temperature control without needing passive cooling systems. This active feedback control eliminates the need for bulky cooling catheters.
Solution Approach 2:
The system uses the optical fiber sensor to self-regulate the heating process by providing real-time temperature data that automatically controls laser power output. The sensor essentially monitors and controls its own operating conditions, eliminating the need for external cooling mechanisms.
3Loss of information
If external MRI scanners and computer interfaces are used for temperature estimation, then temperature monitoring is achieved, but extensive training is required and real-time feedback is delayed
Solution Approach 1:
The patent replaces complex computer-based MRI temperature estimation systems with a simple optical sensor that directly measures temperature. The optical fiber sensor provides immediate temperature readings without requiring complex image processing or computer algorithms, eliminating the need for extensive operator training.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides accurate and direct temperature monitoring, reducing the risk of tissue damage and eliminating the need for cooling systems, resulting in more controlled and effective interstitial laser therapy treatments.
Implementation Method 1
light is directed at a target tissue to induce localhyperthermia
Implementation Method 2
a temperature sensor... provides rapid and reliable feedback concerning the tissue's temperature
Data Source
AI summary
Disclosed is a device for interstitial laser therapy. The device comprises an optical waveguide extending about a central longitudinal axis and having an optical output end; an optical diffuser optically coupled to, optically associate with, or positioned about the optical output end, wherein the optical diffuser comprises a housing having an open end for receiving the optical output end and a first longitudinal portion of the optical waveguide; and a temperature sensor interposed, positioned or located between the central longitudinal axis and an exterior surface of the housing, and preferably within the longitudinal extent of the first longitudinal portion of the optical waveguide. The optical diffuser can be provided with one or more holes, one or more slits, one or more openings, and/or one or more vents. The device can also include a second temperature sensor. Also disclosed is a system for interstitial laser therapy.