Cam-Driven Compaction Tube for Vascular Closure
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Solution Overview
Problem
Existing tissue puncture closure devices face challenges in ensuring proper deployment and placement of sealing plugs, often resulting in incomplete sealing and delayed bleeding due to manual compaction requirements that can displace the plug during sheath removal.
Innovation Solution
A tissue puncture closure device with an automatic compaction system using a filament, anchor, and driving plate with a cam surface, allowing for axial compression and secure placement of the sealing plug without manual intervention, ensuring full retraction and easy separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual compaction is used to compact the sealing plug, then the sealing plug can be compressed to the tissue puncture site, but the sealing plug may be displaced proximally during sheath removal, resulting in incomplete sealing
Solution Approach 1:
The compaction tube is pre-positioned within the delivery sheath in a retracted state before the sealing plug is deployed. When the sheath is removed, the compaction tube automatically advances to compact the sealing plug immediately at the puncture site, preventing proximal displacement and ensuring complete sealing before manual intervention is needed.
Solution Approach 2:
The compaction tube acts as an intermediary mechanism between the delivery sheath and the sealing plug. It provides controlled compaction force to the sealing plug while being mechanically linked to the sheath, ensuring the plug remains properly positioned and compacted during the critical sheath removal phase.
2Ease of operation
If the sheath is removed before compacting the sealing plug, then the compaction tube can be accessed for manual compaction, but the sealing plug may be displaced from the tissue puncture
Solution Approach 1:
The system is configured so that the compaction tube is already in position and ready to act immediately when the sheath is removed. The automatic advancement mechanism ensures compaction occurs at the precise moment needed, eliminating the time delay that allows plug displacement while still providing accessibility for manual compaction if required.
3Manufacturing precision
If automatic compaction is implemented during device retraction, then sealing plug placement precision is improved, but the device complexity increases
Solution Approach 1:
The compaction tube is integrated within the delivery sheath structure, combining the sheath removal function with the compaction function. The cam mechanism is incorporated into the existing spool and filament system, merging multiple functions into a unified structure that achieves automatic compaction without adding significant complexity.
Solution Approach 2:
The spool and filament system serves multiple functions: it controls sheath retraction, drives compaction tube advancement, and can be disengaged to allow full retraction. The cam mechanism provides both automatic compaction during partial retraction and enables complete device withdrawal, making the system multi-functional and reducing the need for separate mechanisms.
4Extent of automation
If the cam mechanism advances the compaction tube during spool rotation, then automatic compaction is achieved, but the device requires precise coordination of moving parts
Solution Approach 1:
The cam mechanism is integrated directly into the spool structure, combining the rotational motion control with the linear compaction tube advancement. This merging of functions reduces the need for separate coordination mechanisms and simplifies the overall system while achieving precise automatic compaction.
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 automatic compaction mechanism ensures a reliable and complete seal at the tissue puncture site, reducing the risk of bleeding and facilitating easier device separation, improving the efficacy of vascular closure procedures.
Implementation Method 1
The driving plate is connected to the spool and has a cam surface portion that is arranged to contact the compaction member assembly upon rotation of the spool to advance the distal end of the compaction member assembly
Implementation Method 2
The compaction member assembly is structured and arranged to apply an axially directed compressive force to automatically compact the sealing plug toward the anchor
Data Source
AI summary
A method and apparatus (200) for sealing a puncture or incision formed percutaneously in a tissue. The apparatus including an anchor (208), a sealing plug (210), a filament (204) connected between the sealing plug and the anchor, a compaction member assembly (e.g. 212), a spool (266) and a driving plate (264). The compaction member assembly being disposed adjacent the sealing plug and structured and arranged to apply an axially directed compressive force to automatically compact the sealing plug toward the anchor. The spool has a portion of the filament wound thereon. The driving plate being connected to the spool and having a cam surface portion. The cam surface portion is arranged to contact a proximal end of the compaction member assembly upon rotation of the spool to advance a distal end of the compaction member assembly.