Catheter Delivery Device Compressible Stroke Control
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Solution Overview
Problem
Existing delivery systems for transcatheter aortic valve replacement face challenges in closing the outer sheath catheter due to compression deformation and lengthening or shortening issues during implant loading, leading to procedural difficulties.
Innovation Solution
A delivery device with a control mechanism that includes a moving assembly and a fixed assembly, utilizing an elastic member and moving member to provide a compressible stroke, allowing the sheath catheter to move relative to the fixed assembly and maintain separation from the TIP head, ensuring the outer sheath catheter can be loaded and expanded without failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outer diameter of the sheath catheter is reduced to pass through the aortic arch more easily, then the ease of operation is improved, but the compression deformation of the valve increases and the loading force increases
Solution Approach 1:
The control mechanism includes a movable assembly that allows dynamic adjustment of the sheath catheter's compression state. The operator can control the degree of compression and decompression during the procedure, enabling the system to adapt to different loading and delivery requirements rather than maintaining a fixed compressed state
2Volume of moving object
If the sheath catheter is highly compressed to accommodate the valve, then the volume is reduced for delivery, but the sheath catheter lengthens or shortens during loading and cannot be closed after loading
Solution Approach 1:
The control mechanism provides real-time feedback and control over the sheath catheter's compression state. The operator can monitor and adjust the compression level during loading to ensure the sheath catheter maintains proper length and can be reliably closed after loading, preventing procedural failures
Solution Approach 2:
The movable assembly enables dynamic control of the sheath catheter's compression and decompression, allowing the system to maintain optimal dimensions during loading and ensure proper closure after implantation, rather than being locked in a fixed compressed state
3Ease of operation
If the valve is highly compressed for delivery, then the ease of delivery is improved, but the compression deformation increases and may cause structural damage
Solution Approach 1:
The control mechanism allows dynamic adjustment of compression forces applied to the valve. The operator can apply minimal compression during delivery while maintaining adequate compression for transit, reducing cumulative deformation and protecting the valve's structural integrity throughout the procedure
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 solution enables successful loading and deployment of the implant by maintaining the compressible stroke, preventing the outer sheath catheter from being closed prematurely, thus overcoming the issues of shortening or lengthening during the loading process.
Implementation Method 1
The moving assembly includes an elastic member and a moving member; the proximal end of the fixed assembly includes a receiving portion with an opening facing the proximal end or the distal end of the moving assembly includes a receiving portion with an opening facing the distal end; the elastic member is arranged in an inner cavity of the receiving portion
Data Source
AI summary
A delivery device (100) and a delivery system (300) are provided. The delivery device (100) includes a catheter assembly (20) and a control mechanism (10); the catheter assembly (20) includes an outer sheath catheter (21) and a sheath core (22); the control mechanism (10) can control the outer sheath catheter (21) to move; a TIP head (23) is arranged at a distal end of the sheath core (22); the control mechanism (10) includes a fixed assembly (11) and a moving assembly (12); the moving assembly (12) is arranged close to a proximal end of the fixed assembly (11); a proximal end portion of the outer sheath catheter (21) passes through the fixed assembly (11) and then is connected to the moving assembly (12), and under the control of the moving assembly (12), the outer sheath catheter (21) can move relative to the fixed assembly (11). When the end surface of a distal end of the outer sheath catheter (21) abuts against the end surface of a proximal end of the TIP head (23), the end surface of a distal end of the moving assembly (12) is separated from the end surface of the proximal end of the fixed assembly (11). Thus, a compressible stroke is provided for the outer sheath catheter (21), solving the problem that the distal end of the outer sheath catheter (21) loaded with an implant (200) cannot be closed with the TIP head (23) due to shortening of the outer sheath catheter (21) or lengthening of the sheath core (22) when the outer sheath catheter (21) of the delivery device (100) is loaded with the implant (200).