Support Catheter Diameter Design for Venous Lesion Passage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing catheters designed for arteries are prone to bending and difficulty in passage through veins due to mismatched diameters, requiring guiding catheters, which can lead to reduced ease of passage and increased complexity in treating deep vein thrombosis.
Innovation Solution
A catheter system comprising a series of coaxially overlapped tubular bodies with specific inner and outer diameters, including a support catheter with an inner diameter of at least 1.4 mm and outer diameter of up to 2.8 mm, and a lubricious coating on the distal end, designed to facilitate passage through veins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin lesion passage catheter is used in a thick vein, then the catheter is likely to bend in the vein, but a guiding catheter is required which increases device complexity
Solution Approach 1:
The patent employs a nested catheter system where a thin lesion passage catheter is inserted within a larger diameter guiding catheter. The guiding catheter serves as an outer sheath that provides structural support and prevents bending of the inner lesion passage catheter during navigation through the vein. This nested configuration allows the thin catheter to maintain flexibility for lesion access while the outer catheter provides the necessary rigidity for stable passage.
2Stability of the object's composition
If the outer diameter of the lesion passage catheter is too small in comparison with the inner diameter of the parent catheter, then the lesion passage catheter bends inside the parent catheter, but increasing the outer diameter reduces ease of passage through the lesion
Solution Approach 1:
The patent applies local quality by creating a specific diameter ratio relationship between the lesion passage catheter and parent catheter. The outer diameter of the lesion passage catheter is designed to be within a specific range (0.5-1.5 times the inner diameter of the parent catheter) to optimize both stability and passage ease. Additionally, the distal end portion of the catheter is equipped with a lubricious coat to reduce friction locally at the critical passage point through the lesion.
Solution Approach 2:
The patent utilizes parameter changes by specifying precise dimensional parameters for the catheter system. The inner diameter of the parent catheter is set within 1.4-2.8 mm and the outer diameter of the lesion passage catheter is controlled to maintain an optimal ratio. These parameter specifications ensure that the catheter has sufficient rigidity to resist bending while remaining thin enough to navigate through venous lesions effectively.
3Ease of operation
If a guiding catheter is used to support the lesion passage catheter, then passage through the lesion is facilitated, but the overall procedure complexity increases
Solution Approach 1:
The patent designs the parent catheter to serve multiple functions: it acts as a guiding catheter to support the lesion passage catheter during navigation, provides a stable platform for the procedure, and maintains patency of the access vein. This multi-functional design reduces the need for separate dedicated guiding devices, thereby facilitating passage while minimizing the increase in overall device complexity.
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 catheter system enhances the ease of passage of lesion passage catheters through veins by conforming to vein diameters, reducing friction, and supporting guide wires and catheters, thereby improving treatment efficiency in deep vein thrombosis.
Implementation Method 1
an outer peripheral surface of at least a distal end portion of the elongated tubular body may be coated with a lubricious coat
Data Source
AI summary
A catheter for supporting a lesion passage catheter capable of improving ease of passage of the lesion passage catheter through a lesion of a vein, a catheter system, and a treatment method. The support catheter includes an elongated third tubular body used for passage through a lesion of a vein, in which an inner diameter of the third tubular body is not less than 1.4 mm and an outer diameter of the third tubular body is not more than 2.8 mm.