Dose Delivery Mechanism With Non-Zero Presetting

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Solution Overview

Problem

Conventional dose delivery mechanisms, such as insulin pens, require users to turn a knob over a large angle range to set a dose, which is inconvenient, especially for high doses, and can lead to errors in dose setting.

Innovation Solution

The dose delivery mechanism is pre-set to a non-zero dose position, with a dose indication member indicating the set dose, and includes hard stops to prevent movement to a zero-dose position, ensuring the user sets a minimum dose without turning the knob more than 360 degrees, and a removable element to prevent premature activation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the dose delivery mechanism is delivered in a zero-dose state, then the device is ready for any dose setting, but the user has to turn the knob over a large angle range to set a dose, which is inconvenient

Engineering Contradiction:

Improvereadiness for any dose settingVSAvoidconvenience of dose setting

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The dose delivery mechanism is delivered in a pre-set state with the dose setting member positioned at a predefined dose position rather than zero-dose. This preliminary positioning reduces the effort required by the user during actual use, as they only need to adjust from the pre-set position rather than setting from zero.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the dose delivery mechanism is pre-set to a non-zero dose, then the user effort is reduced, but the user might forget to set the dose or set an incorrect dose

Engineering Contradiction:

Improveuser effort in dose settingVSAvoidaccuracy of dose setting

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

A dose indication member is provided that visually indicates the current dose setting to the user. This feedback mechanism ensures the user can verify the set dose before administration, preventing errors while maintaining the convenience of pre-setting.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Hard stops are implemented to prevent the dose setting member from being positioned at zero-dose or incorrect positions. These mechanical constraints proactively prevent erroneous dosing by making certain positions physically unreachable.

Inventive Principle:

Principle #9Preliminary anti-action

3Adaptability or versatility

If the dose setting member can be turned more than 360 degrees, then the full dose range is accessible, but the dose indication becomes ambiguous

Engineering Contradiction:

Improvefull dose range accessibilityVSAvoidclarity of dose indication

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The dose setting mechanism is designed with discrete dose positions rather than continuous adjustment. Each dose position corresponds to a specific angular position of the dose setting member, creating distinct, unambiguous settings that eliminate rotational ambiguity while providing full dose range coverage.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250295861A1Dose delivery mechanism and method for providing dose delivery mechanism

Publication Date: 2025.09.25 MEDMIX SWITZERLAND AG

AI summary

A dose delivery mechanism includes a housing, a piston rod to act on a plunger sealing a fluid compartment and to move in an axial direction relative to the housing to deliver a set dose, and a dose setting member movable relative to the housing during dose setting. A position of the dose setting member relative to the housing defines the set dose, and in an as-delivered condition, the dose setting member is preset to a position that corresponds to a set dose higher than zero.