Duodenal Papilla Cryoablation Catheter With Multi-Lumen Coolant Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cryoablation catheters designed for duodenal papilla insertion face challenges in stabilizing the delivery of coolant fluid due to bending at large angles, often leading to lumen closure and inadequate tissue freezing.
Innovation Solution
A cryoablation catheter system with a first inner tube and multiple supply lumens, allowing fluid to pass through different regions, and a discharge flow path between the outer and inner tubes, ensuring stable fluid delivery even through large bending angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If only one lumen is formed for supplying coolant fluid, then the catheter diameter can be minimized for insertion into narrow body cavities, but the lumen closes when the catheter bends at large angles
Solution Approach 1:
The single lumen is divided into multiple lumens (first lumen, second lumen, third lumen) within the first inner tube. This segmentation ensures that if one lumen closes due to bending, the others remain open to deliver coolant fluid, thereby maintaining fluid delivery stability while keeping the catheter diameter small for insertion into narrow body cavities.
Solution Approach 2:
The positions of the lumens are strategically arranged with specific eccentric distances from the centroid of the first inner tube. The guide wire lumen is positioned at the centroid, while supply lumens are positioned at greater eccentric distances. This parameter optimization prevents lumen closure during bending while maintaining minimal catheter diameter.
2Adaptability or versatility
If the catheter is bent to pass through the duodenal papilla, then insertion into the bile duct is enabled, but the lumen for supplying low-temperature fluid closes
Solution Approach 1:
The catheter incorporates multiple supply lumens (first, second, and third lumens) within the first inner tube. When the catheter bends to pass through the duodenal papilla, these segmented lumens ensure that at least one lumen remains open for fluid delivery, maintaining reliability while enabling insertion into the bile duct.
Solution Approach 2:
The lumens are arranged in different spatial positions with specific eccentric distances from the centroid. This three-dimensional arrangement allows the catheter to bend in multiple directions while maintaining at least one open lumen path, enabling passage through the duodenal papilla without compromising fluid delivery.
3Reliability
If multiple supply lumens are formed in different regions, then fluid can be delivered stably even when one lumen closes, but the device complexity increases
Solution Approach 1:
Multiple supply lumens are nested within the first inner tube, which itself is inserted into the outer tube. The first inner tube containing multiple lumens is nested within the outer tube, creating a compact structure that provides redundant fluid delivery paths without significantly increasing overall device complexity.
Solution Approach 2:
The first inner tube serves multiple functions: it contains the guide wire lumen for guide wire passage, houses multiple supply lumens for coolant fluid delivery, and provides structural support. This multi-functionality reduces overall device complexity while maintaining reliable fluid delivery through multiple lumens.
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 system enables stable fluid delivery and efficient tissue freezing by maintaining fluid flow through multiple lumens, even when one lumen is closed, enhancing therapeutic efficacy.
Implementation Method 1
a plurality of supply lumens which allow a fluid to pass therethrough from a proximal side to a distal side of the first inner tube
Implementation Method 2
a first discharge flow path which is located between an inner surface of the outer tube and an outer surface of the first inner tube and which allows the fluid to pass therethrough from a distal side to a proximal side of the outer tube
Implementation Method 3
Cryoablation techniques are medical techniques that involve bringing a device having been set to have a low temperature into contact with a target tissue so as to freeze and necrose cells forming the target tissue
Implementation Method 4
As methods for setting a device to have a low temperature, there are a method in which liquid nitrogen is used and a method in which the Joule-Thomson effect based on high-pressure gas is utilized
Data Source
AI summary
A cryoablation catheter for a duodenal papilla insertion including an outer tube, a first inner tube disposed in an inner cavity of the outer tube, and a first discharge flow path, is provided. The first inner tube has a guide wire lumen and a plurality of supply lumens. The first discharge flow path is located between an inner surface of the outer tube and an outer surface of the first inner tube. The first inner tube includes a hole located in a distal portion of the first inner tube. Any of the supply lumens and the first discharge flow path are in communication with each other through the hole.