Cannula Anchoring Mechanism Reducing Vessel Wall Damage
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Solution Overview
Problem
Existing catheter designs often result in catheter failure due to aspiration of the blood vessel wall, clot formation, or local inflammation, leading to occlusion and increased risk of thrombophlebitis, as they inevitably contact and damage the vessel wall, and struggle with maintaining secure placement without reducing flow rates or increasing vessel wall pressure.
Innovation Solution
A cannula with an anchoring mechanism that minimizes contact with the vessel wall by using protrusions that increase the catheter's external diameter only at the insertion point, allowing secure anchoring without distorting the vessel, and features a shorter invasive section to reduce irritation and dislodgement risks, while maintaining flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If anchoring elements are used to secure catheter placement, then catheter stability is improved, but vessel wall pressure and contact area increase causing damage
Solution Approach 1:
The catheter design applies local quality by concentrating anchoring function at the distal tip through a flared shape and radiopaque band, while the proximal portion maintains a smaller diameter to minimize vessel wall contact. This localized anchoring approach provides stability without requiring extensive contact along the catheter body, thereby reducing overall vessel wall damage and thrombophlebitis risk.
Solution Approach 2:
The catheter is segmented into distinct functional zones: a distal anchoring section with increased diameter and radiopaque band for stability, and a proximal section with smaller diameter for minimal contact. This segmentation allows each portion to perform its specific function optimally while mitigating the harmful effects of extensive wall contact.
2Stability of the object's composition
If anchoring elements contact two points of the vessel wall, then catheter stability is improved, but catheter lumen diameter is reduced decreasing flow rates
Solution Approach 1:
The design concentrates the diameter increase and anchoring function locally at the distal tip, while the proximal catheter body maintains a smaller diameter optimized for fluid flow. This local quality approach ensures stability without compromising the flow capacity of the main catheter lumen.
3Stability of the object's composition
If catheter is inserted at an angle to achieve secure placement, then anchoring is improved, but vessel wall contact and distortion increase
Solution Approach 1:
Instead of angling the entire catheter to achieve anchoring, the design inverts the approach by providing a perpendicular distal tip with a flared shape that anchors effectively at 90 degrees to the vessel wall. This inversion eliminates the need for angled insertion that causes wall distortion while maintaining secure anchoring.
Solution Approach 2:
The flared, curved distal tip design allows the catheter to anchor smoothly against the vessel wall without sharp angles or protrusions that would cause distortion. The curved geometry distributes contact forces more evenly and facilitates perpendicular insertion.
Data Source
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AI summary
Catheter cannula, catheter, and catheterization method, for administering a fluid or/and substance to, or for draining a fluid or/and substance from, a treatment space of a body vessel, duct, or cavity. In some embodiments the cannula includes: an elongated flexible tube mountable on a needle, and having an invasive section and a non-invasive section; and at least one anchoring element protruding from, a surface of the invasive section in a manner such that an operative configuration of each anchoring element increases outer circumferential diameter of the cannula to an extent less than lumen diameter of the body vessel, duct, or cavity, at the treatment space, thereby anchoring the invasive section to inside the body vessel, duct, or cavity, at the treatment space. The catheter includes a needle and the cannula mounted thereupon.