Catheter Positioning Elements for Uniform Tissue Ablation
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Solution Overview
Problem
Conventional tissue ablation methods are limited by inconsistent and non-uniform ablation due to patient movement and organ geometry, leading to incomplete treatment and adverse side effects such as bleeding and perforation, particularly in treating conditions like Barrett's esophagus and endometrial abnormalities.
Innovation Solution
A catheter-based device with positioning elements and steam delivery system that centers itself within the cervix or organ, using temperature sensors to control steam release through ports, ensuring uniform energy distribution and minimizing energy escape, thus providing controlled and consistent ablation without the need for expansion mechanisms or occlusive agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ablation methods are used, then treatment can be performed, but ablation is inconsistent and non-uniform due to patient movement and organ geometry
Solution Approach 1:
The catheter incorporates expandable positioning elements that can dynamically adjust to accommodate organ movement and geometric variations. The positioning elements can expand or contract to maintain optimal contact with the tissue surface despite patient movement, ensuring consistent ablation delivery throughout the procedure.
Solution Approach 2:
The system changes the physical state of the positioning elements from compressed to expanded configuration upon deployment. This parameter change allows the catheter to transition from a compact delivery state to a stable positioning state that conforms to the organ geometry, thereby achieving uniform ablation despite organ movement.
2Reliability
If energy delivery is increased to ensure complete treatment, then treatment efficacy improves, but risk of bleeding and perforation increases
Solution Approach 1:
The catheter incorporates temperature sensors that provide real-time feedback on tissue temperature during ablation. This feedback mechanism allows the control system to monitor tissue response and automatically adjust energy delivery parameters, ensuring complete treatment while preventing excessive energy that could cause bleeding or perforation.
Solution Approach 2:
The system delivers energy in controlled partial increments rather than a single excessive dose. By using multiple positioning elements that can be selectively activated and by modulating energy delivery based on real-time temperature feedback, the system achieves complete treatment through cumulative partial actions while avoiding the harmful effects of excessive single-dose energy delivery.
3Manufacturing precision
If positioning elements are added to improve catheter positioning, then ablation uniformity improves, but device complexity increases
Solution Approach 1:
The catheter is divided into multiple independent positioning elements distributed along its length. Each positioning element can be independently controlled and activated, allowing precise localization of the ablation zone. This segmentation approach improves positioning accuracy while keeping each individual element relatively simple in design.
Solution Approach 2:
The positioning elements serve multiple functions: they provide mechanical support for accurate positioning, create conformal contact with the organ surface, and can be selectively activated to define the treatment zone. This multi-functionality reduces the need for separate positioning mechanisms, thereby limiting the increase in overall device complexity.
4Manufacturing precision
If steam delivery is controlled through multiple ports, then energy distribution uniformity improves, but device complexity increases
Solution Approach 1:
The steam delivery system is segmented into multiple ports distributed along the catheter length, with each port corresponding to a positioning element. This segmentation allows independent control of steam delivery to different zones, achieving uniform energy distribution while using simple port structures that minimize added complexity.
Solution Approach 2:
The steam delivery function is merged with the positioning element structure. The ports are integrated into the positioning elements themselves, combining the mechanical positioning function with the thermal energy delivery function in a single integrated component, thereby avoiding the need for separate steam delivery mechanisms.
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 achieves uniform and controlled tissue ablation, reducing the risk of complications like bleeding and perforation, while allowing for effective treatment of complex anatomies like the esophagus and uterus, with precise energy delivery and distribution.
Implementation Method 1
liquid is converted into vapor within the heating chamber by a transfer of heat from the heating element to the chamber
Implementation Method 2
a transfer of heat from the heating element to the chamber
Implementation Method 3
when high frequency energy is supplied to the induction coil, a magnetic field is created in the area surrounding the chamber and the magnetic field induces an induced current within the ferromagnetic material
Implementation Method 4
the induced current...results in the generation of thermal energy within the ferromagnetic material
Data Source
AI summary
Ablation catheters and systems include multiple inline chambers for containing and heating an ablative agent. The heating chamber includes one or more channels to increase the contact surface area of the ablative agent with the walls of the heating chamber to provide more efficient heating. Induction heating is used to heat a chamber and vaporize a fluid within by wrapping a coil about a ferromagnetic chamber and providing an alternating current to the coil. A magnetic field is created in the area surrounding the chamber which induces electric current flow in the chamber, heating the chamber and vaporizing the fluid inside. Positioning elements help maintain the device in the proper position with respect to the target tissue and also prevent the passage of ablative agent to normal tissues.