Indwelling Venous Cannula With Segmented Puncture Needle

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Solution Overview

Problem

Conventional indwelling venous cannulas face challenges in ensuring accurate vessel puncture, reducing skin trauma, and preventing thrombosis, with issues such as incomplete venous catheter placement and risk of skin particle carryover, as well as limited flexibility and stability.

Innovation Solution

The indwelling venous cannula features a puncture needle with a partially solid design allowing blood aspiration, a puncture-resistant venous catheter with a helical structure, and materials with nonthrombogenic and antimicrobial properties, enhancing accuracy, patient safety, and flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the puncture needle is hollow over the entire length to enable blood aspiration, then blood aspiration capability is improved, but the risk of skin particle carryover into the vein increases

Engineering Contradiction:

Improveblood aspiration capabilityVSAvoidskin particle carryover risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The puncture needle is divided into two distinct sections: a hollow proximal section for blood aspiration and a solid distal section for puncturing. This segmentation allows each section to perform its specific function optimally - the hollow section enables blood aspiration to confirm vein puncture, while the solid section minimizes skin particle generation during penetration

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different structural properties are applied to different parts of the puncture needle. The proximal portion is made hollow to enable blood aspiration, while the distal portion is made solid to reduce skin particle carryover. This local differentiation of structural quality resolves the contradiction between aspiration capability and particle risk

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the venous catheter is made flexible to facilitate insertion, then ease of insertion is improved, but puncture resistance and stability deteriorate

Engineering Contradiction:

Improveease of insertionVSAvoidpuncture resistance

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The venous catheter is constructed as a flexible tube that can be easily inserted into the vein. The flexibility of this shell-like structure facilitates smooth navigation through the puncture site and into the vein, while maintaining sufficient structural integrity for its intended function

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The catheter system combines materials with different properties - the venous catheter uses flexible material for ease of insertion, while the puncture needle uses solid, puncture-resistant material. This composite approach allows each component to have optimized properties for its specific function

Inventive Principle:

Principle #40Composite materials

3Productivity

If the venous catheter is advanced immediately after puncture to achieve intended position, then procedure efficiency is improved, but incomplete placement and thrombosis risk increase

Engineering Contradiction:

Improveprocedure efficiencyVSAvoidcatheter placement accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

Blood aspiration is performed as a preliminary action before advancing the venous catheter. By aspirating blood through the hollow puncture needle first, the operator confirms correct vein puncture and catheter tip positioning. This preliminary verification step prevents incomplete placement and reduces thrombosis risk by ensuring the catheter is properly positioned before full advancement

Inventive Principle:

Principle #10Preliminary action

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

This design improves the certainty of venous catheter placement, reduces skin trauma and thrombosis risk, and allows for repeated use under sterile conditions, while maintaining flexibility and stability.

Implementation Method 1

Such a hollow needle enables the user to aspirate blood even during and after puncturing in order to check directly during and after puncturing whether the relevant vessel has already been correctly punctured

Methodology Applied

Scientific EffectAspiration: Suction

Implementation Method 2

a puncture-resistant venous catheter with a helical structure

Methodology Applied

Scientific EffectHelical structure: Helix

Implementation Method 3

materials with nonthrombogenic and antimicrobial properties

Methodology Applied

Scientific EffectNonthrombogenic property:

Implementation Method 4

materials with nonthrombogenic and antimicrobial properties

Methodology Applied

Scientific EffectAntimicrobial property:

Data Source

PatentUS20230020179A1Indwelling venous cannula

Publication Date: 2023.01.19 EBNET MEDICAL GMBH

AI summary

The invention relates to an indwelling venous cannula (1) for application to a living being, having a venous catheter (2), wherein a puncture needle (3) can be guided in a longitudinally movable manner in the venous catheter (2). The puncture needle (3) is designed as a hollow needle over a portion of its length, wherein at least part of an additional portion of the length of the puncture needle (3) is solid.