Rotatable Injection Needle Actuator for Full Retraction

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Solution Overview

Problem

Existing medical instruments with radially outwardly directed injection needles face issues with the needles not retracting fully into the tubular body, leading to potential tissue damage during withdrawal, especially in thin needles, and require axial displacement that can cause bending or sticking.

Innovation Solution

A medical instrument with a rotatable actuator mechanism that moves injection needles between retracted and extended positions through rotation, using teeth engagement for controlled deployment and retraction, ensuring needles are fully housed when not in use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the injection needle is made extremely thin to minimize tissue damage, then the harm to the patient is reduced, but the needle becomes more prone to bending, sticking, or breaking during axial displacement

Engineering Contradiction:

Improvetissue damageVSAvoidneedle integrity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent transitions from axial displacement (linear motion along the needle axis) to radial displacement (circular motion perpendicular to the needle axis). This dimensional change allows the needle to be deployed and retracted without subjecting it to bending forces, thereby maintaining integrity while minimizing tissue damage.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent replaces the traditional axial mechanical displacement system with a radial deployment system where the needle is pushed outward through the tubular body's wall. This substitution eliminates the mechanical stress of axial movement while achieving the same functional outcome of needle deployment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If axial displacement channels are provided for needle deployment, then the needle can be moved radially outward, but the thin needle may become caught, stuck, or damaged during axial movement

Engineering Contradiction:

Improveneedle deploymentVSAvoidneedle stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent eliminates axial displacement channels by changing the deployment mechanism to radial motion. The needle is pushed outward through pre-formed openings in the tubular body's wall rather than moving axially through channels, thereby avoiding the problem of thin needles becoming caught or stuck.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent pre-forms openings in the tubular body's wall at the desired deployment location before the needle is pushed outward. This preliminary preparation allows the needle to pass through cleanly without encountering resistance or becoming stuck during deployment.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the needle tip remains protruding after retraction to ensure it can puncture tissue, then the injection function is maintained, but the vessel may be damaged or lacerated during instrument withdrawal

Engineering Contradiction:

Improveinjection capabilityVSAvoidvessel damage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent creates a dynamic system where the needle can be easily deployed radially outward through the tubular body's wall and retracted back inside. This dynamic capability allows the needle to be protruding during injection for puncture functionality, then fully retracted before withdrawal to prevent vessel damage, resolving the contradiction between injection capability and safety.

Inventive Principle:

Principle #15Dynamics

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

Ensures safe and efficient deployment and retraction of injection needles, preventing tissue injury during withdrawal and eliminating the need for axial displacement, particularly for thin needles, enhancing handling and safety.

Implementation Method 1

the tip portion can be pressed radially outwards as and when required... the outwardly directed tip portion is fully retracted in the tubular body... the return of the outwardly directed tip portion then takes place on the basis of the elasticity of the outwardly directed tip portion

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentUS12420061B2Medical instrument with injection needles

Publication Date: 2025.09.23 DOC INVENT SA

AI summary

The invention concerns an instrument, for a medical application, said instrument comprising a body (1), at least one needle, channel means (15) to bring a fluid to said at least one needle, and actuating means (6) for moving said at least one needle from a retracted position to an extended position by rotation of actuating means (6) with respect to the body.