Endoscopic RF Ablation Balloon for Chronic GI Bleeding
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Solution Overview
Problem
Current endoscopic cautery methods fail to permanently eradicate chronic bleeding lesions in the digestive tract, such as GAVE, radiation-induced proctopathy, and angiodysplasia, due to their large size and high flow, leading to inconsistent and unsatisfactory results.
Innovation Solution
An endoscopic device with a balloon-based or catheter-mounted electrical array that delivers radiofrequency energy, compressing blood vessels before ablation to control the depth and uniformity of tissue treatment, ensuring coaptive coagulation and permanent hemostasis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional endoscopic cautery methods are used on large, high-flow bleeding lesions, then the procedure can be performed with simple equipment, but the treatment results are inconsistent and unsatisfactory due to the heat sink effect and inability to achieve permanent hemostasis
Solution Approach 1:
The electrode array is divided into multiple discrete electrodes (e.g., 6-12 electrodes) arranged along the catheter shaft, allowing selective activation and distributed energy delivery to large, high-flow bleeding lesions. This segmentation enables treatment of extensive areas while maintaining controlled energy distribution to overcome the heat sink effect.
Solution Approach 2:
A balloon-expandable scaffold or self-expanding frame is introduced as an intermediary structure that provides mechanical compression and stabilization of the tissue against the electrode array. This intermediary ensures intimate contact between electrodes and tissue, improves energy transfer efficiency, and maintains compression during the ablation process to achieve permanent hemostasis.
2Manufacturing precision
If energy is delivered to large, high-flow bleeding lesions without compression, then the procedure is simple, but the blood flow creates a heat sink effect that prevents uniform and controlled ablation
Solution Approach 1:
Mechanical compression is applied to the tissue before energy delivery to reduce blood flow and eliminate the heat sink effect. The balloon or self-expanding frame compresses the tissue against the electrode array, stabilizing the target area and creating optimal conditions for uniform ablation before the ablation process begins.
Solution Approach 2:
The system dynamically adjusts energy delivery parameters (power, pulse duration, electrode selection) based on tissue characteristics and compression level. This parameter optimization ensures uniform energy distribution and controlled ablation depth, achieving consistent treatment results across large, heterogeneous bleeding lesions.
3Reliability
If compression is applied to diminish blood in blood vessels before ablation, then coaptive coagulation is achieved and permanent hemostasis is obtained, but the device and procedure become more complex
Solution Approach 1:
The compression and ablation functions are merged into a single integrated device system. The balloon-expandable scaffold or self-expanding frame combines mechanical compression with electrode array integration, allowing simultaneous compression and energy delivery through the same device platform, thereby achieving permanent hemostasis without requiring multiple separate devices.
Solution Approach 2:
The electrode array system serves multiple functions: it provides mechanical support and compression stabilization, delivers radiofrequency energy for ablation, and enables monitoring of the treatment process. This multi-functionality reduces the need for additional specialized devices while achieving reliable permanent eradication of bleeding lesions.
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 a more permanent solution for chronic bleeding in the digestive tract by compressing blood vessels and delivering energy to achieve uniform and controlled ablation, reducing the heat sink effect and improving treatment outcomes.
Implementation Method 1
An endoscopic device with a balloon-based or catheter-mounted electrical array that delivers radiofrequency energy
Implementation Method 2
delivering energy to achieve uniform and controlled ablation
Implementation Method 3
compressing blood vessels before ablation to control the depth and uniformity of tissue treatment
Implementation Method 4
ensuring coaptive coagulation and permanent hemostasis
Data Source
AI summary
Devices and methods are provided for the ablation of regions of the digestive tract to achieve hemostasis and to eradicate chronically bleeding lesions as occur with gastric antral vascular ectasia (GAVE), portal hypertensive gastropathy (PHG), radiation proctopathy and colopathy, arteriovenous malformations, and angiodysplasia. Ablation is typically provided in a wide-field manner, and in conjunction with sufficient pressure to achieve coaptive coagulation. Ablation, as provided the invention, starts at the mucosa and penetrates deeper into the gastrointestinal wall in a controlled manner. Ablation control may be exerted by way of electrode design and size, energy density, power density, number of applications, pattern of applications, and pressure. Control may also be provided by a fractional ablation that ablates some tissue within a target region and leaves a portion substantially unaffected. Embodiments of the device include an ablational electrode array that spans 360 degrees and an array that spans an arc of less than 360 degrees.