Threaded Intraosseous Needle With Shoulder-Limited Depth Control

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Solution Overview

Problem

Conventional intraosseous needles face issues with infiltration and needle displacement, leading to complications such as fluid leakage and tissue damage, and improper positioning during vascular access.

Innovation Solution

The intraosseous needle assembly features a hub with a threaded section and shoulder portion that limits insertion depth, securing the needle tip within the intraosseous space and preventing displacement, using a shoulder portion to resist further movement into the bone.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the needle is inserted deeply into the bone to ensure proper positioning in the intraosseous space, then vascular access reliability is improved, but the risk of infiltration and extravasation increases

Engineering Contradiction:

Improvevascular access reliabilityVSAvoidinfiltration and extravasation risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The needle incorporates a threaded section with specific thread pitch and depth, transforming the insertion mechanism from simple penetration to controlled screwing. This parameter change allows precise control of insertion depth, ensuring the needle tip reaches the intraosseous space while the shoulder portion prevents over-insertion, thereby maintaining reliability while reducing infiltration risk

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The conventional push-insertion mechanism is replaced with a threading mechanism. The threaded section engages with bone threads, converting linear insertion motion into rotational screwing motion. This mechanical substitution provides controlled, incremental advancement that prevents sudden deep penetration and reduces the risk of the needle tip passing through the bone cortex

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If the needle is inserted securely to prevent displacement during vascular access, then access stability is improved, but the complexity of the needle structure increases

Engineering Contradiction:

Improveneedle stabilityVSAvoidneedle structure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The needle is segmented into distinct functional sections: a threaded section for secure engagement with bone, a shoulder portion for depth limitation and stability, and a hollow bore for fluid access. This segmentation allows each component to perform its specific function efficiently, providing stable needle positioning while maintaining a relatively simple overall structure that can be manufactured as a single piece

Inventive Principle:

Principle #1Segmentation

3Reliability

If the needle design includes depth-limiting features to prevent over-insertion, then safety is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

ImprovesafetyVSAvoiddepth-limiting feature precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The shoulder portion is designed to automatically engage with the bone cortex when the needle is screwed in, providing self-limiting depth control. The mechanical interaction between the shoulder portion and bone surface naturally stops further insertion without requiring external control mechanisms or complex adjustment features, thereby improving safety while avoiding excessive manufacturing precision requirements

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The depth-limiting feature utilizes standard manufacturing tolerances for the shoulder portion diameter and length, converting a precision-critical dimension into a robust, tolerance-insensitive design. The shoulder portion's engagement with the bone is based on gross geometric parameters rather than fine dimensional tolerances, making the safety feature manufacturable with conventional precision

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 design ensures proper needle positioning, preventing over- or under-insertion and reduces the risk of complications by securing the needle in the intraosseous space, enhancing safety and efficacy during vascular access.

Implementation Method 1

a threaded section at the needle tip configured to screw into bone of a patient

Methodology Applied

Scientific EffectThreading: Screw

Implementation Method 2

The shoulder portion is configured to resist movement of the needle through bone of a patient

Methodology Applied

Scientific EffectMechanical contact and force resistance: Mechanical Force

Data Source

PatentUS20250312063A1Intraosseous needle

Publication Date: 2025.10.09 REGENTS OF THE UNIVERSITY OF MINNESOTA

AI summary

An intraosseous needle hub includes a hub body and a needle. The hub body has a hollow bore extending along a central axis from a proximal end to a distal end of the hub body. The needle has a hollow bore extending along the central axis and includes a proximal end attached to the hub body, a distal end including a needle tip, a threaded section at the needle tip configured to screw into bone of a patient, and a shoulder portion between the threaded section and the hub body. The shoulder portion is configured to resist movement of the needle through bone of a patient.