Vascular Access Prosthesis Liner With Open Mesh Wefts
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Solution Overview
Problem
Conventional vascular access methods for hemodialysis suffer from repeated damage and deterioration due to frequent needle punctures, leading to infections, clot formation, and a shortened useful life.
Innovation Solution
A vascular access prosthesis with a flexible support and a liner made of flexible fabric material, comprising multiple concentric layers with open wefts that allow needle passage without breaks or tears, and the ability to reconstitute the wall integrity through internal endothelialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional vascular access is used for hemodialysis, then needle punctures can be performed, but the vascular wall suffers repeated damage and deterioration leading to infections and clot formation
Solution Approach 1:
The vascular access prosthesis is divided into multiple concentric layers (first layer, second layer, third layer) with different functional properties. The first layer provides structural support, the second layer with open wefts allows needle passage, and the third layer prevents clot formation. This segmentation allows each layer to specialize in one function, enabling repeated punctures without compromising overall vascular wall integrity.
Solution Approach 2:
Different regions of the prosthesis have different properties optimized for specific functions. The second layer has open wefts specifically designed to allow needle passage without damage, while the third layer has properties that prevent clot formation. This local differentiation of material properties enables the prosthesis to withstand repeated punctures while maintaining reliability.
2Productivity
If repeated needle punctures are performed in the same area, then hemodialysis treatment can be continued, but the vascular access useful life is shortened
Solution Approach 1:
The prosthesis is designed with dynamic properties that allow it to adapt to repeated needle insertions. The second layer's open wefts can dynamically open to accommodate needles and then close or regenerate to maintain vascular integrity. This dynamic capability enables the prosthesis to support frequent hemodialysis treatments while extending its useful life by preventing permanent damage.
Solution Approach 2:
The prosthesis structure allows for the temporary opening of pathways during needle insertion and then recovers by closing or regenerating the vascular wall in the same location. This cycle of opening for treatment and recovering for continued use enables repeated hemodialysis sessions while maintaining the long-term viability of the vascular access.
3Reliability
If the vascular access wall is made more resistant to punctures, then repeated needle insertions are possible, but the complexity of the prosthesis structure increases
Solution Approach 1:
Instead of making a single complex layer resistant to punctures, the prosthesis segments the wall into multiple layers with specialized functions. The second layer with open wefts specifically handles needle passage, while other layers provide structural support and prevent clotting. This segmentation simplifies each individual layer while achieving overall high reliability.
Solution Approach 2:
The prosthesis uses composite material construction with different layers having different material properties optimized for their specific functions. The first layer provides structural integrity, the second layer with open wefts allows needle passage, and the third layer prevents clot formation. This composite approach achieves high resistance to punctures through coordinated material properties rather than a single complex material.
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 prosthesis enables multiple and frequent needle punctures without damage, extends the useful life by regenerating the wall, and reduces the risk of infections and clot formation, facilitating more efficient and frequent hemodialysis treatments.
Implementation Method 1
a liner (3) of flexible fabric material made of woven material, comprising a plurality of layers, at least two, or more, of concentric mesh layers having wefts open enough to allow the needles to pass through the defined steps between the meshes, without breaks or tears
Implementation Method 2
with the ability to close and reconstitute by internal endothelization in order to guarantee the tightness for the blood
Implementation Method 3
labyrinthine interstices formed by the wefts of each layer are capable of being crossed by a needle to form at least one step through the wall of the prosthesis formed by such plurality of concentric layers
Data Source
AI summary
A vascular access prosthesis for hemodialysis, which prevents damage and consequently the formation of clots and/or infections in the vascular access, since the prosthesis comprises a flexible support and a fabric liner consisting of a plurality of layers of open mesh weave that form a fixation matrix for the fibrin of the blood and that are capable of regenerating before successive perforations, thus significantly exceeding the useful life of conventional prostheses, and providing a better quality of life to people.