Needle Packaging System Resolving Sterility and Stability Trade-offs
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Solution Overview
Problem
Existing packaging solutions for specialized needles used in bioprosthetic heart valve production fail to ensure sterile, undamaged, and organized delivery of hundreds of needles during shipment, as materials like flashspun high-density polyethylene are either too flexible or lack the necessary rigidity to maintain needle arrangement.
Innovation Solution
A packaging system comprising a sealed outer pouch permeable to sterilizing gases but impermeable to microbes, an inner pouch made of a tough and flexible material, and an intermediate holder of greater rigidity to constrain the needles, combined with a method using a synthetic paper card to create a stable and sterilized package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flashspun high-density polyethylene is used for packaging needles, then the material is tough and resistant to puncturing, but it is flexible and allows needles to get jumbled during transport
Solution Approach 1:
The patent implements a nested packaging structure where an inner pouch containing needles is placed inside an outer pouch. The inner pouch provides puncture resistance while the outer pouch provides structural rigidity. This nested arrangement allows each layer to perform its specialized function without interfering with the other, resolving the contradiction between toughness and structural stability.
Solution Approach 2:
The packaging system combines two different materials with complementary properties: flashspun high-density polyethylene for puncture resistance and a rigid material (such as molded plastic or corrugated material) for structural support. This composite approach allows the packaging to simultaneously achieve both toughness and rigidity, preventing needle jumbling while maintaining puncture resistance.
2Stability of the object's composition
If needles are fixed on a cardboard fixture as done in retail sale, then needle arrangement is maintained, but this is not practical for a container of hundreds of needles
Solution Approach 1:
The patent uses flexible pouches made of tough material to contain and organize hundreds of needles. Unlike rigid cardboard fixtures that would be cumbersome for large quantities, the flexible pouch conformally holds the needles in an organized manner while remaining manageable in size and easy to seal. This approach maintains arrangement stability without proportionally increasing structural complexity.
3Stability of the object's composition
If a rigid container is used to prevent needle movement during shipment, then needle arrangement is maintained, but sterilization becomes difficult
Solution Approach 1:
The patent employs flexible pouches made of sterilizable materials that can withstand autoclave or other sterilization processes. These pouches provide sufficient constraint to prevent needle jumbling during shipment while remaining flexible enough to be sterilized effectively. The pouches are designed with appropriate material properties and structural features (such as ventilation holes or permeability characteristics) that facilitate sterilization while maintaining needle arrangement stability.
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 maintains needle sterility and organization during shipment, preventing damage and repositioning, while allowing for efficient sterilization and easy access to needles for use in bioprosthetic heart valve construction.
Implementation Method 1
a first material, which is permeable to a sterilizing gas but that is impenetrable to microbes
Data Source
AI summary
A needle package having a sealed outer pouch made of a first material, which is permeable to a sterilizing gas but that is impenetrable to microbes and an inner pouch filled with needles, and made of a second material, which is tough and flexible. Also, an intermediate holder, holding the inner pouch, is sealed within the outer pouch, the intermediate holder being made of a third material having greater rigidity than the second material, and defining an interior volume. Further, sterile surgical needles are held within the inner pouch and the intermediate holder constrains the inner pouch to the interior volume, thereby restricting freedom of movement of the needles to reduce needle repositioning during shipment.