Stereotactic Drive System for Tumor Heating Control
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Solution Overview
Problem
Current treatments for brain tumors, such as surgery and stereotactic radiosurgery, are invasive or lack precise control, and existing thermal therapy systems struggle to accurately focus heat exclusively on tumors while minimizing damage to surrounding tissue, especially due to the irregular shapes of brain tumors.
Innovation Solution
A drive system for controlling the precise longitudinal and rotational movement of elongate members, like laser probes, within a tumor, using a base unit with rotatable knobs and a follower assembly that includes pulleys and wires for controlled movement, integrated with MRI compatibility to ensure accurate positioning and minimize tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If interstitial thermal therapy is used to heat tumors from within, then energy is applied directly to the tumor with extended energy deposition throughout the entire tumor, but it is difficult to control the position of the elongate member precisely to heat the entire tumor uniformly while minimizing damage to surrounding tissue
Solution Approach 1:
The drive system incorporates feedback mechanisms where the controller receives position information from sensors and adjusts the drive signals to achieve precise positioning of the elongate member within the tumor. This feedback loop enables accurate control of the longitudinal and rotational positions to ensure uniform heating throughout the tumor volume while minimizing damage to surrounding tissue.
Solution Approach 2:
The drive system is designed with multi-functionality to control both longitudinal movement and rotational positioning of the elongate member through a single integrated system. The controller can independently adjust longitudinal position and rotational angle, providing universal control capabilities that enable precise positioning at any orientation and location within the tumor for uniform energy deposition.
2Quantity of substance
If the elongate member is moved longitudinally and rotated to heat different parts of the tumor, then the full volume of the tumor can be heated, but precise control of both longitudinal and rotational positions is required to avoid damaging surrounding normal brain tissue
Solution Approach 1:
The drive system enables local quality control by independently adjusting the longitudinal position and rotational angle of the elongate member. This allows the energy deposition pattern to be precisely tailored to match the local geometry of the tumor at different positions and orientations, concentrating energy within the tumor boundaries while minimizing energy deposition in surrounding normal tissue.
Solution Approach 2:
The system employs dynamic control where the controller continuously adjusts both longitudinal and rotational parameters based on real-time position feedback. This dynamic adjustment enables the elongate member to adapt its position and orientation to follow the complex three-dimensional geometry of irregularly shaped tumors, ensuring complete coverage while maintaining safety margins around the tumor boundary.
3Reliability
If multiple intersecting beams of radiation are used in stereotactic radiosurgery, then the tumor receives a lethal dose while surrounding tissue remains unharmed, but confirmation that the tumor has been killed is not possible for several months and high doses may reach the toxic threshold
Solution Approach 1:
The system replaces the mechanical radiation delivery system with a thermal delivery system using an elongate member that can be precisely positioned and oriented within the tumor. This mechanical substitution enables real-time control and monitoring of energy deposition, allowing immediate confirmation of treatment effectiveness through temperature monitoring and imaging, eliminating the months-long waiting period required for radiation treatment verification.
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
Enables precise control over heat energy deposition within tumors, reducing damage to surrounding tissue and allowing for effective treatment of tumors of any size or shape, improving treatment accuracy and safety.
Implementation Method 1
The tumor optical fiber has an element at its 'inserted' end that redirects laser light from an exterior source in a direction generally at right angles to the length of the fiber. The energy from the laser thus extends into the tissue surrounding the end or tip and effects heating.
Data Source
AI summary
A drive system for controlling movement of an elongate member includes a base unit having a first rotatable knob and a second rotatable knob, a follower assembly including a follower slidably coupled to a guide rail, a longitudinal movement wire, and a rotational movement wire. The follower includes a longitudinal movement pulley, a rotational movement pulley, and an alignment element structured to receive an elongate member such that the elongate member is attachable thereto. The longitudinal movement wire operably couples the first rotatable knob to the longitudinal movement pulley such that rotation of the first knob drives the follower in a longitudinal direction along the guide rail. The rotational movement wire operably couples the second rotatable knob to the rotational movement pulley such that rotation of the second knob rotates the alignment element and attached elongate member.