Vessel Filter Delivery Catheter Grooves Prevent Hook Entanglement
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Solution Overview
Problem
Existing vessel filters encounter issues with entanglement and interlocking of radially expandable legs during deployment, particularly when hooks are implemented, which complicates the compressed/collapsed condition and renders the device useless.
Innovation Solution
A vessel filter delivery device with a built-in mechanism featuring grooves at the distal opening of the catheter to separate hooks, a pusher-wire with an attachment interface for loading/unloading, and a centering mechanism using flexible elements to ensure smooth deployment and prevent entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hooks are implemented on radially expandable legs to prevent filter migration, then anchoring capability is improved, but hooks may interlock with other legs or hooks in compressed condition rendering the device useless
Solution Approach 1:
A delivery device with a lumen is introduced as an intermediary component between the hooks and the external environment. The hooks are positioned within the lumen during compression and delivery, preventing them from interlocking with other legs. The delivery device acts as a protective mediator that enables the hooks to perform their anchoring function without causing deployment failures.
2Length of moving object
If radially expandable legs are compressed into a small size for delivery, then ease of insertion is improved, but legs may become entangled during compression and delivery
Solution Approach 1:
The delivery device serves as a mediator that guides and separates the radially expandable legs during compression and delivery. By providing a structured lumen and positioning mechanism, the delivery device prevents the legs from becoming entangled while maintaining a compact delivery profile, ensuring smooth deployment when expanded.
3Ease of operation
If hooks are made more elastic to permit straightening during withdrawal, then ease of retrieval is improved, but hook strength may be reduced
Solution Approach 1:
The material properties of the hooks are optimized by selecting materials with appropriate elastic characteristics. The hooks are designed with controlled elasticity that allows them to straighten during withdrawal for easy retrieval while maintaining sufficient strength during the anchoring phase. This parameter optimization enables both strong anchoring and easy retrieval without compromising hook integrity.
Data Source
AI summary
A filter delivery device for implanting a vessel filter within a blood vessel of a patient's body. The filter delivery device includes a mechanism for preventing hooks and/or legs on a vessel filter from entangling with each other while the vessel filter is loaded within the delivery device. In one variation, the filter delivery device includes a delivery catheter with grooves at the distal end lumen opening. When a vessel filter with radially expanding legs is compressed and inserted into the distal end of the delivery catheter, the hooks on the distal end of the legs are received and separated by the corresponding grooves on the delivery catheter. In another variation, a pusher rod, with a receptacle for receiving the hooks, is positioned within a delivery catheter to prevent the entanglement of the hooks and/or legs of a filter loaded within the delivery catheter.