Auto-injector Cassette with Unitary Biasing and Damping
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Solution Overview
Problem
Existing auto-injector devices face challenges in preventing unintended movement of syringes during transport and accommodating different syringe sizes within a common cassette unit geometry, as well as minimizing the effects of shock impacts that could lead to syringe fracture.
Innovation Solution
The cassette unit incorporates a unitary biasing and damping element that provides stability and shock absorption, along with a sleeve form adapter that can be tailored to fit various syringe sizes, ensuring secure positioning and protection during handling and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common cassette unit geometry is used to accommodate different syringe sizes, then versatility is improved, but syringe stability and positioning are worsened
Solution Approach 1:
The cassette unit includes adjustable positioning elements and adapters that can be configured locally to match different syringe dimensions. The adapter mechanism provides tailored support surfaces and engagement features that adapt to specific syringe sizes while maintaining overall cassette geometry, thereby achieving both versatility and stability.
Solution Approach 2:
The cassette unit incorporates movable and adjustable components that can be dynamically reconfigured to accommodate different syringe sizes. The positioning system allows for adjustment of support elements to match various syringe dimensions, providing stable positioning for each specific configuration while maintaining the same cassette unit.
2Object-affected harmful factors
If shock absorption features are added to the cassette unit, then protection against shock impacts is improved, but device complexity is worsened
Solution Approach 1:
The cassette unit incorporates pre-installed shock-absorbing elements such as compliant mounting features and damping materials integrated into the cassette structure. These elements are designed to absorb shock impacts before they can damage the syringe, providing protection through the cassette's inherent structural design rather than adding separate complex protection systems.
Solution Approach 2:
The cassette unit utilizes composite construction with materials that inherently provide shock absorption properties. The cassette housing may incorporate polymer blends or composite structures that combine rigidity for structural support with compliant phases for shock damping, achieving protection without significant increases in device complexity.
3Device complexity
If a unitary biasing and damping element is used, then device complexity is reduced, but manufacturing precision requirements are worsened
Solution Approach 1:
The cassette unit integrates biasing and damping functions into a single unitary element or closely coupled component system. This merging reduces the total number of parts and simplifies assembly, while the design incorporates distinct functional zones within the unified structure that address different mechanical requirements through carefully engineered geometry and material distribution.
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
This solution effectively reduces syringe movement and shock-induced damage, allowing for the reliable use of multiple syringe sizes within a single cassette unit, enhancing safety and usability.
Implementation Method 1
a biasing element defining a biasing relationship between the cassette unit end-cap and the flange of the syringe, thereby urging the syringe forwards in relation to the cassette unit end-cap
Implementation Method 2
a damping element defining a damping relationship between the cassette unit end-cap and the flange of the syringe, thereby acting to damp movement of the syringe relative to the cassette unit end-cap, wherein the biasing element and the damping element are comprised as a unitary biasing and damping element
Data Source
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AI summary
Provided is a cassette unit suitable for use with an auto-injector having a drive unit. The cassette unit comprises a cassette unit housing defining a cassette unit housing cavity, which is in receipt of a syringe, a rearward entrance to said cavity and a forward needle projection aperture. The cassette unit also comprises in capping relationship with the rearward entrance of the cassette unit housing, a cassette unit end-cap, said cassette unit end-cap defining a drive rod-receiving opening for receipt of a drive rod for providing forward axial drive to said plunger; a biasing element defining a biasing relationship between the cassette unit end-cap and an end flange of the syringe barrel, thereby urging the syringe forwards in relation to the cassette unit end-cap; and a damping element defining a damping relationship between the cassette unit end-cap and the flange of the syringe, thereby acting to damp rearward movement of the syringe relative to the cassette unit end-cap.