Medicinal Fluid Injection Device Cover Body Air Pressure Response

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Solution Overview

Problem

Existing medicinal fluid injection devices, such as insulin injection devices, face challenges in preventing internal contamination and backflow of air during the priming operation, which can lead to the injection of air into the patient.

Innovation Solution

A medicinal fluid injection device equipped with a cover body that includes a cover part made of elastic material, which changes shape in response to air pressure, thereby preventing air backflow and device contamination. The cover body features a frame with a hole, a cover part that bulges due to air pressure, and an auxiliary cover part that is concave to accommodate initial medicinal fluid discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a cover body is added to prevent air backflow and contamination, then device reliability is improved, but device complexity increases

Engineering Contradiction:

Improveprevention of air backflow and contaminationVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cover body is divided into multiple functional parts: a cover part for sealing, an auxiliary cover part for accommodating air, and a frame for structural support. This segmentation allows each part to perform its specific function while maintaining overall simplicity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The auxiliary cover part acts as an intermediary space between the injection needle and the main cover body. It receives and accommodates air discharged during priming, preventing air backflow into the device interior without requiring complex valve mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the cover part is made of elastic material to respond to air pressure, then air backflow prevention is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveair pressure responseVSAvoidelastic material fabrication

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The cover part is made of elastic material that can deform in response to air pressure changes. This flexible structure automatically adapts to pressure variations during priming operations, providing reliable air backflow prevention without requiring precise manufacturing tolerances.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The elastic material's physical properties (flexibility, elasticity) are utilized to respond dynamically to air pressure changes. The material's inherent properties enable automatic adaptation to varying operational conditions without requiring complex control systems or high-precision manufacturing.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the auxiliary cover part is added to accommodate initial medicinal fluid discharge, then contamination prevention is improved, but device complexity increases

Engineering Contradiction:

Improvecontamination preventionVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The auxiliary cover part is pre-configured with a concave shape to receive and accommodate initial medicinal fluid discharge during priming. This preliminary arrangement ensures that any fluid discharged during air removal is automatically contained, preventing contamination of the device interior before the main injection operation begins.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The auxiliary cover part converts the potentially harmful effect of initial medicinal fluid discharge (which could cause contamination) into a beneficial feature by providing a dedicated containment space. The concave structure safely receives the discharge fluid, transforming what would be a contamination risk into a controlled part of the priming process.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 solution effectively prevents air backflow during the priming operation and maintains device cleanliness by accommodating air and initial medicinal fluid discharge, ensuring safe and reliable injection of medicinal fluids.

Implementation Method 1

a cover body covering the opening, wherein the cover body includes a cover part of which a shape changes according to an air pressure caused by the injection needle

Methodology Applied

Scientific EffectAir pressure: Pressure Increase

Implementation Method 2

The cover part may include an elastic material. The at least one region of the cover part may bulge in a direction away from the housing due to the air pressure

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS20250050028A1Medicinal fluid injection device

Publication Date: 2025.02.13 EOFLOE

AI summary

The disclosed technology relates to a method for using a medicinal fluid injection device comprising a housing having an opening in a side surface thereof, a storage container arranged inside the housing and configured to store a medicinal fluid, an injection needle connected to the storage container and configured to inject the medicinal fluid when stored in the storage container through the opening, and a cover body covering the opening, wherein the cover body includes a cover part configured such that the a shape of the cover part changes according to air pressure caused by the injection needle.