Blood Filter Delivery Catheter Centering Mechanism
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Solution Overview
Problem
Existing blood filter delivery systems lack a self-acting mechanism for centering the delivery catheter, making it difficult to align the filter properly during implantation, which can lead to misalignment and reduced filtering efficiency.
Innovation Solution
The use of positioner members coupled to a push rod assembly that grip the filter's anchor members, allowing the catheter to be aligned with the blood vessel's centerline before releasing the anchor members, ensuring proper filter placement and anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a blood filter is delivered using a conventional delivery catheter, then the filter can be implanted into the blood vessel, but the delivery catheter cannot be automatically centered, leading to misalignment and reduced filtering efficiency
Solution Approach 1:
The positioner members are pre-configured in a compressed state within the delivery catheter to grip the anchor members. Before filter deployment, these positioner members automatically center the delivery catheter by pressing against the vessel wall, ensuring proper alignment is achieved in advance of the actual filter implantation.
Solution Approach 2:
The positioner members are designed to self-actuate upon deployment. When the delivery catheter is positioned in the vessel, the positioner members automatically engage the anchor members and press against the vessel wall to center the catheter, without requiring external assistance or additional centering procedures.
2Manufacturing precision
If positioner members are added to grip anchor members for centering, then alignment precision is improved, but the device structure becomes more complex
Solution Approach 1:
The positioner members are integrated with the anchor members as a single unified structure. The positioner members are formed as extensions or attachments of the anchor members themselves, combining the anchoring function and the centering function into one integrated component, thereby reducing overall system complexity.
Solution Approach 2:
The anchor members serve dual functions: they provide mechanical anchoring of the filter to the vessel wall, and they incorporate positioner members that simultaneously center the delivery catheter during deployment. This multi-functionality eliminates the need for separate centering mechanisms.
3Reliability
If the filter is anchored immediately upon delivery, then the filter is secured in place, but the catheter cannot be properly aligned first, risking vessel injury
Solution Approach 1:
The positioner members are designed to first press against the vessel wall to center and align the delivery catheter before the anchor members engage the vessel wall. This preliminary alignment action ensures the filter is properly positioned prior to anchoring, preventing misalignment-related vessel injury.
Solution Approach 2:
The anchoring process is segmented into distinct phases: first the positioner members engage to center the catheter, then the anchor members are released to secure the filter. This segmentation allows sequential execution of alignment and anchoring functions, ensuring safe and proper filter placement.
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
This solution enables precise alignment and anchoring of the blood filter within the blood vessel, improving filtering efficiency and reducing the risk of vessel injury from misalignment, without requiring additional procedures or radiation exposure.
Implementation Method 1
the positioner members bend away from the centerline of the catheter and push rod assembly
Implementation Method 2
pressing on the blood vessel wall with the positioner members aligns the end of the catheter with the centerline of the blood vessel
Implementation Method 3
The hooked ends of the anchor members engage the vessel wall and hold the filter in place
Data Source
AI summary
A blood filter delivery system for delivering a blood filter into a vein includes a push rod for pushing the blood filter through and out of a catheter, the push rod having a filter positioning assembly on one end. The filter positioning assembly includes positioner members, which retain anchor members of the filter. The filter positioning assembly can position the end of the delivery catheter near the blood vessel centerline before releasing the filter's anchor members, thereby helping to align the blood filter along the centerline of the blood vessel.