Bulb-Expanded Vascular Puncture Needle for Echographic Guidance
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Solution Overview
Problem
Existing puncture devices for vascular access face challenges in maintaining echographic visualization of the needle tip, leading to potential unintended perforation of the distal vessel wall, and lack a mechanism to stop the puncture tool once the vessel is penetrated.
Innovation Solution
A puncture device with a tubular body featuring a bulb-shaped external diameter expansion next to the cutting edge, enhancing echogenicity and providing a resting point on the vessel wall, along with a visible mark and a mandrel for improved echographic monitoring and stable needle positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a needle with modified external surface (troughs or notches) is used to enhance echographic visualization, then the visibility of the needle tip is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention applies local quality by creating a bulb-shaped expansion only at a specific location (next to the cutting edge) rather than modifying the entire needle surface. This localized modification enhances echographic visualization at the critical area while keeping the rest of the needle simple and easy to manufacture.
Solution Approach 2:
The invention changes the physical parameter of the needle by creating a bulb-shaped expansion that alters the echogenic properties at the tip area. This parameter change improves ultrasound reflection and visualization without requiring complex surface modifications along the entire needle length.
2Device complexity
If a needle without a stopping mechanism is used, then the device complexity is reduced, but the reliability of preventing inadvertent perforation decreases
Solution Approach 1:
The bulb-shaped expansion acts as a preliminary stopping mechanism that prevents the needle from advancing beyond the vessel wall before the actual puncture is completed. This preliminary action ensures that even if the operator loses echographic vision, the needle cannot inadvertently perforate the distal wall.
Solution Approach 2:
The bulb-shaped expansion serves as an intermediary element between the needle and the vessel wall, providing a mechanical stop that mediates the interaction between the puncture tool and the vessel structure, preventing direct contact and potential damage.
3Ease of operation
If the needle advance cannot be stopped after vessel puncture, then the ease of operation is improved, but the harmful effects of inadvertent perforation increase
Solution Approach 1:
The bulb-shaped expansion provides preliminary anti-action by creating a mechanical barrier that counteracts any unintended further advancement of the needle. This preliminary protective action is in place before any harmful perforation can occur, automatically preventing damage without requiring additional operational steps.
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
Enhances echographic visibility, prevents accidental perforation of the vessel wall, and allows for precise needle alignment within the vessel, facilitating guide insertion and reducing manufacturing complexity.
Implementation Method 1
the loss of the visual continuity of the cutting edge of the needle being used could lead the operator to produce an unnoticed perforation
Implementation Method 2
a needle having a tubular body, said tubular body having a distal end and a proximal end; a cutting edge in the distal end of said tubular body
Data Source
AI summary
The present invention is related to the field of devices for introducing and extracting media from the body, more specifically to the devices for introducing media into the 5 body by means of intravascular access, and in particular, provides a puncture device for accessing the vascular system comprised of: a needle having a tubular body, with said tubular body having a distal end and a proximal end, a cutting edge in the distal end of said tubular body, and an expansion of the external diameter having a bulb shape next, in distal-proximal direction, to said cutting edge.In this way, a puncture device is provided for accessing the vascular system that solves the problem of allowing the echograph monitoring of the needle, but whose fabrication implies a reduction in the technical difficulty for its obtention, while it avoids the accidental perforation of the distal wall of the vessel of interest.