Single Slider Double Barrel Syringe for Intra-Articular Injection

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Solution Overview

Problem

Administering intra-articular injections is a complex procedure due to the need for precise positioning, often resulting in ineffective delivery despite the use of medical imaging tools, and existing syringes have multiple components that can lead to cross-contamination and malfunction.

Innovation Solution

A syringe design featuring a single slider or valve that translates between withdrawal and injection configurations, reducing complexity and the number of moving parts, while incorporating seal devices like O-rings to enhance sealing and prevent leaks, thereby facilitating precise needle placement and sterile administration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple valves or sliders are used to control fluid withdrawal and injection, then the syringe can perform both diagnostic and therapeutic functions, but the device complexity increases and the risk of cross-contamination and malfunction increases

Engineering Contradiction:

Improvefunctional versatilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines the withdrawal and injection functions into a single integrated syringe system with a single slider that controls both fluid withdrawal and injection operations. The single slider replaces what would traditionally require multiple separate valves or control mechanisms, thereby reducing device complexity while maintaining the ability to perform both diagnostic (fluid withdrawal) and therapeutic (fluid injection) functions.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If multiple moving components are used in the syringe, then the device can perform complex functions, but the number of parts that can malfunction increases and manufacturing costs increase

Engineering Contradiction:

Improvefunctional capabilityVSAvoidreliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent merges multiple moving components into a single slider mechanism that performs both withdrawal and injection control. This reduction in the number of moving parts directly improves reliability by eliminating potential failure points while maintaining full functional capability through the integrated design of the single slider.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If multiple moving components are used in the syringe, then the device can perform complex functions, but manufacturing and labor costs increase

Engineering Contradiction:

Improvefunctional capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent combines multiple components into a single slider assembly, which simplifies the manufacturing process by reducing the number of parts that need to be produced, assembled, and quality-tested. This integration maintains full functional capability while significantly reducing manufacturing and labor costs.

Inventive Principle:

Principle #5Merging (Combining)

4Device complexity

If a single slider is used to control both withdrawal and injection, then the device complexity is reduced, but the sealing requirements become more critical to prevent cross-contamination

Engineering Contradiction:

Improvedevice complexityVSAvoidsealing integrity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent employs flexible sealing elements such as O-rings and elastomeric seals within the single slider mechanism. These flexible sealing components conform to the bore surfaces and maintain reliable seals during the slider's movement between withdrawal and injection positions, preventing cross-contamination while allowing the simplified single-slider design.

Inventive Principle:

Principle #30Flexible shells and thin films

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 syringe design allows for precise placement of the needle tip, reduces the risk of cross-contamination, and simplifies the administration process, improving manufacturing and labor costs while ensuring effective treatment delivery.

Implementation Method 1

The slider translates between a first position and a second position in a direction which is perpendicular to a flow path of the bodily fluid drawn into the hub

Methodology Applied

Scientific EffectMechanical translation:

Implementation Method 2

a seal device positioned around the slider and in sealing engagement with an exterior surface of the slider

Methodology Applied

Scientific EffectSealing:

Data Source

PatentEP3445426B1Single slider double barrel syringe for medical diagnostics, therapeutic use, and placement confirmation and joint space injection

Publication Date: 2021.01.13 ELCAM MEDICAL ACS LTD

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AI summary

A syringe is provided having a hub with an orifice, first and second barrels having interior surfaces to form respective lumens, a slider, and an optional test indicator. The first and second barrels slideably receive respective first and second plungers for movement therein. The slider is operable to provide a fluidly communicative path between the orifice of the hub and the first and second barrel lumens. The optional test indicator is responsive to at least one characteristic of bodily fluid, the test indicator positioned to be exposed to any bodily fluid drawn into the first barrel lumen and visible from an exterior of the first barrel.