Endovascular Stent-Graft With Extravascular Extension
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Solution Overview
Problem
Current medical devices are not suitable for less invasive surgical procedures, particularly for accessing large blood vessels like the aorta, vena cava, or common femoral artery, which require more complex interventions than coronary stent placement.
Innovation Solution
An endovascular stent-graft with an extravascular extension, comprising a stent-graft and a branching vascular graft that extends from the stent-graft, allowing for minimally invasive access to the circulatory system by creating an aperture for external access, enabling procedures such as coronary bypass surgery and hemodialysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional open surgical approach is used to access large blood vessels like the aorta or vena cava, then surgical access is achieved, but surgical invasiveness and trauma increase
Solution Approach 1:
The stent-graft is divided into two functional segments: an intravascular portion that expands within the target vessel to provide structural support and seal, and an extravascular extension that protrudes through the vessel wall to provide external access points. This segmentation allows the device to simultaneously achieve internal vascular access while enabling external surgical intervention, thereby reducing the need for large open incisions and associated surgical trauma.
Solution Approach 2:
The extravascular extension is nested within the intravascular stent-graft structure, with the extension protruding through the vessel wall from within the graft. This nested configuration allows the device to maintain internal vascular integrity while providing external access points, eliminating the need for separate external access sites and reducing overall surgical invasiveness.
2Object-affected harmful factors
If a minimally invasive endovascular approach is used, then surgical trauma is reduced, but access to complex procedures like coronary bypass surgery is limited
Solution Approach 1:
The stent-graft with extravascular extension serves multiple functions: it provides structural support and sealing within the target vessel, creates external access points for surgical instruments, and enables various procedures including coronary bypass surgery, heart valve repairs, and hemodialysis access. This multi-functionality allows a single minimally invasive device to support diverse complex procedures that would traditionally require multiple separate access sites and open surgery.
Solution Approach 2:
The device transitions from a purely intravascular structure to a three-dimensional configuration with extravascular extensions protruding through the vessel wall. This dimensional change enables surgical instruments to access the vascular system from the external dimension while maintaining internal vascular integrity, thereby enabling complex procedures like coronary bypass surgery through minimally invasive means.
3Ease of operation
If an extravascular extension is added to the stent-graft, then external access to the circulatory system is enabled, but device complexity increases
Solution Approach 1:
The extravascular extension is merged with the intravascular stent-graft as an integrated single-piece structure rather than a separate component. This merging simplifies the overall device architecture by eliminating the need for separate access devices, guides, or external anchoring mechanisms, while still providing the necessary external access points for surgical procedures.
Data Source
AI summary
An endovascular stent-graft with an extravascular extension is presented including: a stent-graft having an aperture and a vascular graft having an and attached to the aperture and a free end. Methods of using the endovascular stent-graft with an extravascular extension include providing the endovascular stent-graft with an extravascular extension to a target vessel of the patient and using free end to either provide access for a circulatory medical procedure or attaching the free end to another point in the circulatory system to perform a bypass operation or to provide a graft for providing hemodialysis. The methods may be performed noninvasively through incisions in the back of the patient.