Safety Catheter Assembly With Passive Needle Tip Capture

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Solution Overview

Problem

Existing catheter insertion devices struggle with inconsistent and risky release of the catheter hub from the needle cannula, increasing the likelihood of inadvertent needle sticks during the catheter insertion process.

Innovation Solution

A safety catheter insertion assembly with a passive release mechanism, featuring a compliant seal member and safety clip that smoothly transitions from a first position allowing the needle tip extension to a second position capturing it within the clip, ensuring safe removal of the needle cannula 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 patient's vein, but the release of the catheter hub from the needle cannula is inconsistent and risky, increasing the likelihood of inadvertent needle sticks

Engineering Contradiction:

Improvesafety of needle cannula releaseVSAvoidsmoothness of catheter hub release

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The safety clip is pre-positioned in a first position where it applies compressive force to the compliant seal member, which in turn applies force to the needle cannula to hold it in place. This preliminary action ensures the needle cannula is securely retained before the release process begins, preventing inadvertent needle sticks during the transition phase.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The mechanism employs dynamic movement of the safety clip between two positions. When the catheter hub is released, the safety clip transitions from the first position (applying compressive force) to the second position (capturing the needle tip). This dynamic transition ensures smooth, controlled release of the needle cannula while maintaining safety throughout the process.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the needle cannula is withdrawn from the catheter tube, then the catheter can be advanced further into the vein, but the needle tip may be exposed, increasing the risk of needle sticks

Engineering Contradiction:

Improveefficiency of catheter advancementVSAvoidexposure to sharp needle tip

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The safety clip acts as an intermediary component between the needle cannula and the external environment. It captures and contains the sharp needle tip within its structure, serving as a protective barrier that allows the needle cannula to be withdrawn and the catheter to advance without exposing the needle tip to potential contact.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The needle cannula is nested within the safety clip structure, with the sharp distal tip contained inside the clip's protective housing. This nesting arrangement ensures that as the needle cannula is withdrawn from the catheter tube, the needle tip remains enclosed within the safety clip, preventing exposure while allowing continued catheter advancement.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Reliability

If a safety clip mechanism is implemented, then needle stick risk is reduced, but the device complexity increases

Engineering Contradiction:

Improveprotection against needle sticksVSAvoidstructure of release mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The compliant seal member is made of flexible, elastomeric material that can deform and return to its original shape. This flexibility allows the seal member to accommodate the movement of the needle cannula and safety clip without requiring complex mechanical components, reducing overall device complexity while maintaining effective needle tip containment.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The mechanism utilizes changes in force parameters rather than complex mechanical linkages. The safety clip applies compressive force to the compliant seal member, which transmits force to the needle cannula. This force-based control system is simpler than traditional mechanical locking mechanisms, achieving reliable needle tip protection through controlled force application and release.

Inventive Principle:

Principle #35Parameter changes

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 passively releasing the catheter from the insertion device, 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. In the second position, the compressive forces reduced and release of the safety clip from the compliant seal member is enabled

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20260091202A1Releasable safety catheter insertion assembly

Publication Date: 2026.04.02 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.