Medicament Delivery Sub-Assembly Syringe Flange Protection

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Solution Overview

Problem

Medicament delivery devices such as autoinjectors face issues with syringe flange breakage and rattling sounds, which existing technologies have not adequately addressed.

Innovation Solution

A sub-assembly comprising a tubular rotator, a tubular housing, and a syringe support with a helically extending slot and an axially extending rib, along with optional flexible structures and a compensation spring assembly, is used to prevent syringe flange breakage and reduce rattling sounds by managing forces and absorbing shocks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a rigid syringe support structure is used, then structural strength is improved, but syringe flange breakage occurs due to excessive force transmission

Engineering Contradiction:

Improvestructural strengthVSAvoidsyringe flange integrity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the mechanical parameter of the syringe support from rigid to flexible, allowing it to deform elastically under load. This flexibility absorbs excess forces that would otherwise transmit to the syringe flange, preventing breakage while maintaining adequate structural support.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The flexible syringe support acts as a pre-designed cushioning element that absorbs shock and force variations before they reach the syringe flange. This protective function is built into the support structure itself, preventing flange breakage before it occurs.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Ease of manufacture

If loose internal components are used, then device assembly is simplified, but rattling sounds occur during device operation

Engineering Contradiction:

Improveassembly simplicityVSAvoidrattling sounds

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent employs flexible elements within the housing structure that conform to and dampen vibrations of internal components. These flexible features act as vibration isolators, reducing rattling sounds while maintaining simple assembly procedures.

Inventive Principle:

Principle #30Flexible shells and thin films

3Object-generated harmful factors

If fixed internal components are used, then rattling sounds are reduced, but device complexity increases

Engineering Contradiction:

Improverattling soundsVSAvoidinternal structure complexity

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent combines multiple functions into integrated components: the syringe support simultaneously provides structural support, force absorption, and vibration damping. The housing integrates mounting features and damping elements into a unified structure, reducing overall device complexity while maintaining effectiveness.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20240325647A1Components and sub-assemblies for medicament delivery devices

Publication Date: 2024.10.03 SHL MEDICAL AG

AI summary

The present disclosure provides a sub-assembly for a medicament delivery device. The sub-assembly includes a tubular rotator, a tubular housing, and a syringe support. The rotator includes a protrusion extending from an outer surface of the rotator. The syringe support includes a helically extending slot on an inner surface of the syringe support, the protrusion being in the helically extending slot. The syringe support includes an axially extending slot on an outer surface of the syringe support. The housing includes an axially extending rib extending from an inner surface of the housing, the axially extending rib being in the axially extending slot.