Temporary Stent Assembly for Anastomosis Without Occluding Blood Flow
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Solution Overview
Problem
Existing medical devices for endovascular repair and anastomosis procedures often disrupt blood flow, causing cardiac morbidity and risking injury to diseased aorta vessels, with potential embolization of plaque.
Innovation Solution
A medical device comprising a guide wire cannula, pusher, and temporary stent assembly with self-expanding, blood-impermeable material supported by woven metal, allowing for continuous blood flow during procedures by forming sealing zones and a recess to facilitate anastomosis without occluding blood vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If occlusive clamps are used to join arteries during anastomosis procedures, then arterial anastomosis can be achieved, but blood flow is interrupted causing cardiac morbidity and ischemia
Solution Approach 1:
A temporary stent assembly with a covered portion acts as an intermediary device, maintaining patency of the aorta while allowing anastomosis procedures to be performed on branch arteries. The stent assembly includes proximal and distal sealing zones that create barriers to blood flow, directing blood through the covered portion and preventing embolization during the procedure.
Solution Approach 2:
The stent assembly is divided into functional segments: proximal sealing zone, covered portion with recess, and distal sealing zone. Each segment performs a specific function - the sealing zones block blood flow laterally, the covered portion maintains luminal patency, and the recess provides access for anastomosis. This segmentation allows blood flow to be redirected through controlled pathways.
2Reliability
If occlusive clamps are placed across diseased aorta vessels, then arterial connection can be established, but injury to the diseased vessels and embolization of plaque occurs
Solution Approach 1:
The temporary stent assembly serves as a protective intermediary within the aortic lumen, preventing direct manipulation and potential plaque disruption that would occur with external clamps. The covered portion acts as a barrier that prevents embolization while allowing surgical access to branch arteries for anastomosis procedures.
Solution Approach 2:
The covered portion of the stent assembly functions as a flexible barrier that prevents embolization of plaque material while maintaining blood flow. The covered stent design creates a protective shell that contains potential embolic debris and directs blood flow through the covered lumen, preventing contact with diseased arterial walls.
3Object-affected harmful factors
If a temporary stent assembly with sealing zones is deployed, then blood flow continuity is maintained during procedures, but device complexity increases
Solution Approach 1:
The temporary stent assembly performs multiple functions simultaneously: the proximal and distal sealing zones block lateral blood flow, the covered portion maintains aortic luminal patency, the recess provides surgical access, and the entire device prevents embolization. This multi-functionality in a single integrated device reduces the need for multiple separate components and procedures.
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
Enables uninterrupted blood flow during bypass or anastomosis procedures, reducing cardiac stress and minimizing the risk of embolization, while allowing for safe deployment and retrieval of the device.
Implementation Method 1
the temporary stent assembly is self-expanding
Data Source
AI summary
A medical device for temporary deployment into a bodily lumen is provided. The medical device comprises: a guide wire cannula having a proximal end and a distal end; a tip attached to the proximal end of the guide wire cannula; a pusher having a proximal and a distal end, the pusher having a through-bore disposed around the guide wire cannula; and a temporary stent assembly having a proximal end attached to the tip and a distal end adjacent to the proximal end of the pusher. The temporary stent assembly comprises a covered portion. The covered portion has a proximal sealing zone, a distal sealing zone and a recess between the proximal and distal sealing zones.