Releasable Safety Catheter Assembly for Smooth Needle Tip Shielding

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Solution Overview

Problem

Existing catheter insertion devices face challenges in smoothly and safely releasing the catheter from the needle cannula, increasing the risk of inadvertent needle sticks.

Innovation Solution

A safety catheter insertion assembly with a passive release mechanism, featuring a compliant seal member and safety clip that moves between positions to capture and shield the needle tip, allowing for smooth detachment without interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional catheter insertion device is used, then the catheter can be inserted into the vein, but the release mechanism creates risk of inadvertent needle sticks

Engineering Contradiction:

Improvesafety of needle tip captureVSAvoidsmoothness of catheter release

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The release mechanism is self-actuating through the interaction between the compliant seal member and safety clip. When the catheter is pulled back from the insertion device, the compliant seal member automatically engages the safety clip to capture the needle tip, eliminating the need for manual activation and reducing user error.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The safety clip is pre-positioned within the catheter hub, and the compliant seal member is pre-configured to engage it. This preliminary arrangement ensures that as soon as the catheter is withdrawn, the needle tip is immediately captured without requiring additional user actions.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the catheter is firmly coupled to the insertion device, then stable insertion is achieved, but release becomes difficult and interferes with needle tip capture

Engineering Contradiction:

Improvestability during insertionVSAvoidease of catheter release

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The coupling between the catheter and insertion device transitions from a firm, stable connection during insertion to a releasable connection during withdrawal. The compliant seal member deforms to allow passage during insertion, then engages the safety clip to enable controlled release and needle tip capture.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The mechanical properties of the compliant seal member change based on the operational phase. During insertion, the seal member is compliant to allow catheter passage; during release, it engages the safety clip to provide the necessary mechanical interaction for needle tip capture.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a complex release mechanism is used, then needle tip capture can be improved, but device complexity increases

Engineering Contradiction:

Improveeffectiveness of needle tip shieldingVSAvoidnumber of components in release mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The release mechanism merges multiple functions into a minimal component set. The compliant seal member serves both as a sealing element and as the actuating element that engages the safety clip. The safety clip itself performs both the release function and the needle tip capture function, eliminating the need for separate mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The safety clip is a multi-functional component that enables catheter release from the insertion device and simultaneously captures and shields the needle tip. This universal component performs multiple critical functions without requiring additional specialized parts.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 mechanism effectively inhibits inadvertent needle sticks by securely capturing the needle tip during release, enhancing the safety and efficiency of the catheter insertion process.

Implementation Method 1

a compliant seal member... In the first position, a portion of the safety clip applies a compressive force to a portion of the compliant seal member

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS12502509B2Releasable safety catheter insertion assembly

Publication Date: 2025.12.23 ICU MEDICAL INC

AI summary

A safety catheter insertion assembly configured to inhibit access to the distal tip of a needle cannula prior to release of a catheter insertion assembly from a catheter hub. The safety catheter insertion assembly including a catheter assembly having an elastomeric blood control valve and a catheter insertion device having a safety clip, the safety clip movable between an expanded configuration in which a portion of the safety clip applies a compressive force to a portion of the elastomeric blood control valve, and a collapsed configuration in which the compressive force is reduced and release of the safety clip from the elastomeric blood control valve is enabled.