Vascular Prosthesis Deployment System with Independent Sheath Expansion
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Solution Overview
Problem
Conventional methods for repairing transected body vessels during emergency medical procedures are time-consuming and require high skill, often leading to complications such as clot formation, muscle necrosis, and the need for subsequent surgical interventions, as they involve temporary shunts and sutures that can weaken the vessel connection.
Innovation Solution
A deployment system comprising a radially movable prosthesis with an inner and outer sheath, allowing for independent expansion of prosthesis portions within the vessel, facilitating rapid and secure anchoring to the vessel walls without compressing the tissue, thereby reducing the need for extensive surgical time and skill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surgical repair methods (suturing, ligation, temporary shunts) are used to repair transected body vessels, then the vessel can be reconnected or blood flow restored, but the procedure is time-consuming and requires high physician skill
Solution Approach 1:
The prosthesis is self-expanding upon deployment, automatically expanding to its functional configuration without requiring manual manipulation or suturing by the physician. The self-expanding mechanism allows the prosthesis to self-anchor to the vessel walls through radial force, eliminating the need for time-consuming suturing steps while maintaining reliable vessel repair
Solution Approach 2:
The invention extracts the complex suturing and tying steps from the repair process by using a self-expanding prosthesis that anchors to vessel walls through radial force alone. This removes the time-consuming manual operations while preserving the essential function of restoring blood flow and sealing the vessel
2Reliability
If sutures are used to affix the vessel to the fitting, then the prosthesis can be secured to the vessel, but tissue compression increases the risk of necrosis
Solution Approach 1:
The invention replaces the mechanical compression system (sutures tying tissue against the fitting) with a radial expansion system. The self-expanding prosthesis applies uniform radial force outward against the vessel walls, securing the prosthesis without compressing the tissue between sutures, thereby eliminating the necrosis risk associated with suture compression
Solution Approach 2:
Instead of compressing tissue inward against the fitting with sutures, the prosthesis expands outward radially to anchor to the vessel walls. This inverted approach achieves secure anchoring through outward radial force rather than inward compression, preventing tissue necrosis while maintaining reliable attachment
3Productivity
If temporary shunts are inserted to restore blood flow quickly, then hemostasis can be achieved, but clots form requiring subsequent surgical intervention
Solution Approach 1:
The self-expanding prosthesis automatically expands to its functional configuration upon deployment, immediately restoring blood flow without requiring subsequent surgical intervention for clot removal or shunt replacement. The self-expanding mechanism ensures proper apposition to vessel walls from the outset, preventing clot formation while rapidly restoring hemodynamics
Solution Approach 2:
The prosthesis is pre-configured in a compressed state within the delivery system, allowing rapid deployment and immediate expansion to restore blood flow. This preliminary preparation enables quick restoration of hemostasis while the self-expanding design ensures proper positioning and apposition from the start, preventing the clot formation issues associated with temporary shunts
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 system enables rapid and secure repair of transected vessels, maintaining blood perfusion and hemostasis, reducing the risk of complications like necrosis and clot formation, and potentially eliminating the need for subsequent surgical interventions by providing a stable vascular conduit.
Implementation Method 1
The prosthesis can be radially movable between a compressed configuration and an expanded configuration
Data Source
AI summary
A deployment system for vascular repair of a transected body vessel is provided. The system can include a prosthesis, an inner sheath, and an outer sheath. The inner sheath can be configured to selectively retain a first portion of the prosthesis in the compressed configuration, leaving a remaining portion of the prosthesis uncovered by the inner sheath. The outer sheath can be configured to retain the remaining portion of prosthesis in the compressed configuration and the first portion of the prosthesis within the inner sheath. The outer sheath is removable from the prosthesis to allow an expansion of the remaining portion of the prosthesis to the expanded configuration at a first opening in the transected vessel. The inner sheath is removable from the prosthesis first portion to allow an independent expansion of the first portion to the expanded configuration at a second opening in the transected vessel.