Puncturing Device Anchoring Balloon Stent Fenestration
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Solution Overview
Problem
Existing mechanical fenestration devices face challenges such as the puncturing needle bending or sliding on the stent's coating membrane, leading to inaccurate puncturing and a high risk of damaging the contralateral coating membrane or vascular wall due to the short distance between the needle and these structures.
Innovation Solution
A puncturing device with an inflatable anchoring balloon and catheter that restrains the radial movement of the puncturing needle, maintaining a safe distance by creating a tension region on the coating membrane, preventing the membrane from being sunken into the stent and reducing the risk of further puncture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the puncturing needle is used to puncture the coating membrane, then the fenestration is achieved, but the coating membrane may be sunken into the stent causing the needle to bend or slide
Solution Approach 1:
The anchoring balloon is expanded before puncturing to pre-establish a stable support structure. This preliminary action creates a rigid platform that prevents the coating membrane from sinking during the subsequent puncturing operation, thereby maintaining needle stability and puncturing accuracy.
Solution Approach 2:
The anchoring balloon acts as an intermediary structure between the puncturing needle and the stent coating membrane. By expanding the balloon first, it provides a stable intermediate platform that supports the membrane during puncturing, preventing direct interaction between the needle and the flexible membrane that would cause sinking or bending.
2Productivity
If high puncturing force is exerted to penetrate the membrane, then puncturing speed is improved, but the needle may continuously move forward and damage the contralateral membrane or vascular wall
Solution Approach 1:
The anchoring balloon is expanded in advance to establish a controlled puncturing environment. This preliminary setup allows for controlled puncturing with moderate force, as the balloon provides structural support that prevents the needle from deflecting or over-puncturing, thereby reducing damage risk while maintaining efficient puncturing speed.
Solution Approach 2:
The expanded anchoring balloon provides a cushioning effect that absorbs excess puncturing force. When the needle penetrates the membrane, any excessive force is absorbed by the balloon structure rather than being transmitted to the contralateral membrane or vascular wall, preventing continuous forward movement and potential damage.
3Adaptability or versatility
If the coating membrane is flexible to allow stent expansion, then stent adaptability is improved, but the membrane sinks into the stent during puncturing
Solution Approach 1:
The anchoring balloon is expanded before puncturing to temporarily stiffen the membrane area. This preliminary action maintains the membrane's overall flexibility for stent expansion while creating a localized rigid platform at the puncture site, preventing sinking during needle insertion.
Solution Approach 2:
The anchoring balloon creates a localized change in membrane properties at the puncture site while leaving the rest of the membrane flexible. The balloon-inflated region provides structural support to prevent sinking, whereas the surrounding membrane retains its flexibility for stent expansion and adaptation.
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 solution enhances puncturing accuracy and success rate by maintaining a stable distance between the needle and the vascular wall, reducing the likelihood of damage to the contralateral coating membrane or vascular wall during the fenestration process.
Implementation Method 1
an inflatable anchoring balloon... In a filled state, a central region of the distal end part of the anchoring balloon is sunken towards the proximal end to form a sunken region
Implementation Method 2
maintaining a safe distance by creating a tension region on the coating membrane, preventing the membrane from being sunken into the stent
Data Source
AI summary
A puncturing device and an anchoring device, the puncturing device including: a puncturing needle, an inflatable anchoring balloon, and a catheter which passes through a proximal end and distal end of the anchoring balloon, the puncturing needle being movably accommodated within the catheter; in a filled state, a central area of an end portion of the distal end of the anchoring balloon is depressed towards the proximal end to form a depressed area, and a distal end of the catheter is located within the depressed area. The anchoring device includes the anchoring balloon and the catheter. The puncturing device may improve the accuracy and success rate of puncturing, and after puncturing is complete, an expansion balloon may be transported along a guide wire to expand a puncturing opening by simply withdrawing the puncturing needle and a push rod.