Self-locking closure device for percutaneous punctures
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Solution Overview
Problem
Existing closure devices for percutaneous punctures in blood vessels face challenges in effectively sealing and maintaining the seal over time, particularly due to the reliance on hemostatic collagen plugs that require clotting and external springs for locking, which can be cumbersome and less reliable.
Innovation Solution
A closure device comprising an anchor, plug, and filament with a lock mechanism that uses a tamper assembly to increase tamping force, allowing for mechanical locking and sealing by applying tension to the filament, ensuring the plug is securely anchored within the puncture tract.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hemostatic collagen plugs are used for sealing punctures, then sealing function is achieved, but the device requires external springs and clotting time which increases device complexity and procedure time
Solution Approach 1:
The patent removes the external spring component from the closure device, replacing it with a self-locking mechanism where the filament itself provides the locking function through its passage through the lock eye and anchor aperture. This extraction simplifies the device while maintaining sealing reliability.
Solution Approach 2:
The closure device performs its own locking function without requiring external springs or additional locking components. The filament serves dual purposes: drawing the plug through the puncture tract and simultaneously locking the device in place through its interaction with the lock eye and anchor aperture.
2Stability of the object's composition
If external springs are used to hold the plug in deformed state, then plug positioning is maintained, but the procedure requires additional components and time for spring removal
Solution Approach 1:
The external spring is completely removed from the system. Instead, the filament itself provides the holding function by maintaining tension and passing through the lock eye, eliminating the need for spring installation and removal steps.
Solution Approach 2:
The function of holding the plug in deformed state is merged with the filament's primary function of drawing the plug through the puncture tract. The same filament that pulls the plug also maintains its position through the lock eye and anchor aperture.
3Manufacturing precision
If tamper assembly is moved relative to frame to increase tamping force, then plug deformation control is improved, but the mechanism adds structural complexity
Solution Approach 1:
The tamper assembly incorporates a movable relationship between the tamper body and frame, allowing dynamic adjustment of tamping force. The tamper body can move relative to the frame to apply controlled deformation to the plug, improving precision while keeping the mechanism relatively simple.
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 device provides a reliable and efficient sealing mechanism that maintains the closure without external springs, utilizing a lock and tamper assembly to ensure the plug remains in place until absorbed by the body, enhancing the sealing process's reliability and effectiveness.
Implementation Method 1
The expansion of the plug within the tract is enhanced by the fact that it is formed of a compressed collagen so that it expands in the presence of blood within the puncture tract
Implementation Method 2
the closure device quickly becomes locked in place through the clotting of the hemostatic collagen plug within the puncture tract
Implementation Method 3
Tension is maintained on the filament by use of an externally located spring during the tamping procedure
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A closure device for sealing a percutaneous puncture in a wall of a body passageway, the device comprising an anchor configured to engage an interior surface of the body passageway, a plug, a contiguous elongate filament, coupled to the anchor and the plug, including first and second sections extending from the anchor with the first section extending through a collar connected to the second section such that a loop is formed, wherein the loop extends through an orifice in the plug, a lock frictionally engaged to a portion of the first section extending beyond said loop, wherein the lock is movable along the filament, whereby as the lock is moved towards the anchor, the loop shrinks causing the plug to move toward the anchor, wherein the lock is configured to prevent the loop from expanding after said shrinkage of the loop.