Indwelling Cannula Forward Mechanism for Safer Needle Retraction

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Solution Overview

Problem

Existing indwelling cannulas lack intuitive handling and safety features for easy and safer use in medical procedures.

Innovation Solution

The invention provides a grip region with a forward mechanism for easy and safer use in medical procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the puncture needle is made sharp for easy puncture, then puncture ease is improved, but the risk of accidental injury increases

Engineering Contradiction:

Improvepuncture easeVSAvoidaccidental injury risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The safety mechanism is pre-configured with a blocking element that automatically engages after puncture to prevent further needle movement, ensuring the needle cannot cause accidental injury while maintaining sharpness for easy puncture

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A blocking element acts as an intermediary between the sharp puncture needle and the surrounding tissue, preventing direct contact between the needle and tissue after puncture is complete, thereby eliminating accidental injury risk

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the catheter tube is made flexible for comfortable insertion, then insertion comfort is improved, but structural stability deteriorates

Engineering Contradiction:

Improveinsertion comfortVSAvoidstructural stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The catheter tube is constructed as a flexible shell that can bend and conform to anatomical structures during insertion, providing comfort while maintaining sufficient structural integrity through material selection and wall thickness optimization

Inventive Principle:

Principle #30Flexible shells and thin films

3Adaptability or versatility

If the indwelling cannula is designed with multiple components for functionality, then functional capability is improved, but device complexity increases

Engineering Contradiction:

Improvefunctional capabilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The puncture needle, catheter tube, and safety mechanisms are merged into a single integrated indwelling cannula assembly, reducing the number of separate components while maintaining all necessary functions of puncture, catheter placement, and safety protection

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20260000872A1Indwelling cannula

Publication Date: 2026.01.01 EBNET MEDICAL GMBH

AI summary

The invention relates to an indwelling cannula (1) for puncturing a hollow body by means of a puncture needle, wherein the indwelling cannula (1) has a catheter (2) with a vasiform catheter tube (22), in which the puncture needle can be guided longitudinally displaceably. The indwelling cannula (1) has a manually actuable forward feed mechanism (5) by which a relative movement can be generated between the catheter tube (22) and the puncture needle as a result of manual actuation, by which a puncture tip (31), protruding from the catheter tube (22) at the near-patient end, of the puncture needle can be received in the catheter tube (22). Preferably, at least one operating element of the forward feed mechanism (5) is configured as a pivotably mounted lever (53) with at least one lever arm.