Cannula Part With Spring-Driven Inserter for Controlled Insertion

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Solution Overview

Problem

Existing medical device assemblies for subcutaneous or intramuscular insertion lack a stable and efficient mechanism for inserting penetrating members, such as needles or cannulas, with controlled velocity and acceleration, and often result in the penetrating member being visible or at risk of being pulled away during removal.

Innovation Solution

A medical device assembly comprising an inserter device with a penetrating member and a base part, where the inserter device is designed to guide the penetrating member to the insertion site with controlled movement, and is detachable in a direction different from the insertion direction, using a spring mechanism for efficient insertion and removal, and includes a cannula part with a soft cannula and bushing for secure attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the penetrating member is kept in a position where it is not visible and cannot contact the user or patient before insertion, then patient safety and comfort are improved, but the device structure becomes more complex requiring additional protective mechanisms

Engineering Contradiction:

Improvepatient safetyVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The penetrating member is nested within the inserter device housing, which provides protection and concealment before insertion. The cannula is inserted through a sealed port in the base part, keeping the penetrating member hidden and isolated from the patient and user until the moment of insertion, thus maintaining safety without excessive structural complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The device is divided into separate functional components: the inserter device housing, the base part with sealed port, and the penetrating member. This segmentation allows the penetrating member to be protected within the inserter while enabling controlled access through the sealed port, balancing safety requirements with structural simplicity.

Inventive Principle:

Principle #1Segmentation

2Shape

If the assembly is designed with a low profile, then patient comfort and cosmetic appearance are improved, but the inserter device has limited space for acceleration mechanisms and guiding structures

Engineering Contradiction:

Improveprofile heightVSAvoidspace for mechanisms

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The guiding means and acceleration mechanisms are arranged in a planar configuration within the inserter device, utilizing the horizontal plane rather than vertical stacking. This allows sufficient space for functional mechanisms while maintaining a low vertical profile, resolving the contradiction between compact shape and mechanism space.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If the inserter device is detachable from the base part in a direction different from insertion direction, then ease of removal is improved, but the risk of the penetrating member being pulled away during removal increases

Engineering Contradiction:

Improveremoval easeVSAvoidpenetrating member stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The penetrating member is fully inserted and secured in the base part before the inserter device is detached. The sequential operation ensures that the penetrating member is already in its final position and stable when the inserter is removed in a different direction, preventing any risk of the penetrating member being pulled away during removal.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If the moving part is pushed in one direction with a simple spring mechanism, then device simplicity is improved, but control over velocity and acceleration of the penetrating member is reduced

Engineering Contradiction:

Improvespring mechanism simplicityVSAvoidvelocity and acceleration control

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The guiding means provide mechanical feedback and constraints on the movement of the moving part, regulating the velocity and acceleration of the penetrating member during insertion. The guiding structure works in conjunction with the spring mechanism to achieve controlled insertion while maintaining relative simplicity of the overall mechanism.

Inventive Principle:

Principle #23Feedback

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 assembly allows for precise control of the penetrating member's insertion and removal, ensuring stability and minimizing the risk of the member being pulled away during detachment, while maintaining a low profile and allowing for individual control of velocity and acceleration.

Implementation Method 1

The penetrator is accelerated by means (45) to a receiving position in the base part (100). This makes it possible to push the moving part in one direction with a simple spring mechanism

Methodology Applied

Scientific EffectSpring mechanism: Spring

Data Source

PatentEP2452709B1Cannula part

Publication Date: 2022.01.19 UNOMEDICAL AS

Figure 1A~1C
Figure 2A~2C
Figure 2D~2F

AI summary

The invention concerns a cannula part comprising a body and a cannula assembly comprising a soft cannula and a bushing, the cannula assembly being fastened inside the body of the cannula part.