Coil Automatic Tamping Vascular Closure Device
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Solution Overview
Problem
Existing vascular closure devices require manual tamping of sealing plugs, which can lead to partial sealing and bleeding due to displacement of the plug during sheath removal, hindering proper placement and causing late bleeding from tissue punctures.
Innovation Solution
An automatic tamping mechanism using a coil connected to the sealing plug, driven by a spool and driving plate, ensures the plug is tamped towards an anchor upon withdrawal of the closure device, facilitating full retraction and easy separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual tamping is used to place the sealing plug, then the operator can control the tamping process, but the sealing plug may be displaced proximally during sheath removal, resulting in partial seal and late bleeding
Solution Approach 1:
The coil is pre-loaded and positioned within the sheath before the procedure. Upon sheath removal, the coil automatically expands and engages the sealing plug to tamp it distally, performing the tamping action in advance before the plug can be displaced proximally. This preliminary positioning and automatic activation eliminates the timing issue that causes plug displacement in manual tamping.
Solution Approach 2:
The system uses the sheath removal action itself to trigger the tamping mechanism. As the sheath is pulled back, the coil passively expands and engages the plug without requiring separate manual intervention. The system serves itself by converting the sheath removal motion into the tamping force needed to secure the plug.
2Ease of operation
If the sheath is removed before tamping the sealing plug, then the tamping tube can be accessed for manual grasping, but the sealing plug may be displaced proximally, hindering proper placement
Solution Approach 1:
The coil acts as an intermediary mechanism between the sheath removal action and the sealing plug. Instead of directly manipulating the plug with the tamping tube, the coil mediates the force transmission, ensuring the plug is tamped distally as the sheath is removed. This intermediary mechanism protects the precision of plug placement while still allowing sheath removal.
Solution Approach 2:
The coil is pre-positioned within the sheath to engage the sealing plug before sheath removal completes. This preliminary engagement ensures the plug is secured in the correct distal position before the sheath is fully withdrawn, preventing proximal displacement and ensuring precise placement without requiring post-removal adjustment.
3Reliability
If automatic tamping is implemented during device retraction, then the sealing plug remains securely positioned, but the device complexity increases with additional mechanical components
Solution Approach 1:
The coil transitions from a compressed, low-profile state during insertion to an expanded, active state during sheath removal. This dynamic transformation allows the same component to serve multiple functions: compact storage during delivery and active tamping during deployment, reducing overall device complexity while maintaining reliability.
Solution Approach 2:
The coil serves multiple functions: it acts as a tamping mechanism, a positioning guide, and a deployment trigger. By combining these functions into a single component that activates passively during sheath removal, the design avoids adding separate complex mechanisms for each function, thereby limiting the increase in device complexity.
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 tamping mechanism ensures a secure seal at the tissue puncture site, reducing the risk of bleeding and improving the effectiveness of vascular closure by maintaining plug placement without manual intervention.
Implementation Method 1
a coil operatively connected to the sealing plug for automatically tamping the sealing plug toward the anchor
Data Source
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AI summary
A method and apparatus for sealing a puncture or incision formed percutaneously in a tissue with an anchor, a sealing plug and a filament or other mechanism connecting the anchor and sealing plug. The method and apparatus provide for automatic tamping and/or cinching of the sealing plug when the apparatus is withdrawn from the puncture site. The automatic tamping and/or cinching is facilitated by a coil transducing a motive force generated by the withdrawal of the apparatus into a tamping and/or cinching force.