Cannula Housing Molding on Lancing Device
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Solution Overview
Problem
Existing methods for producing cannula housings for subcutaneous administration of active substances often result in high reject rates due to damage to flexible cannulas during the manufacturing process, particularly when a stabilizing mandrel is used, leading to instability and potential failure during use.
Innovation Solution
A method where a ready-to-use cannula lancing unit is threaded with a loose cannula, and then a cannula housing is molded onto it, eliminating the need for additional components like stabilizing mandrels and ensuring a secure connection through reshaping the cannula's end for a firm fit within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stabilizing mandrel is inserted into a flexible cannula to enable processing, then the cannula can be processed more easily, but the cannula is damaged during subsequent steps leading to high reject rates
Solution Approach 1:
The cannula is threaded onto the lancing device before the cannula housing is molded, which preliminary positions and stabilizes the cannula in the correct orientation. This preliminary action eliminates the need for a separate stabilizing mandrel and prevents damage during subsequent manufacturing steps.
Solution Approach 2:
The lancing device serves multiple functions: it acts as both the functional piercing element and a temporary support structure during manufacturing. By combining these functions, the patent eliminates the need for a separate stabilizing mandrel while ensuring the cannula remains undamaged throughout production.
2Stability of the object's composition
If additional components like stabilizing mandrels are used to prevent cannula damage, then cannula stability during processing is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The lancing device is designed to serve dual purposes: as the functional piercing element and as a temporary support structure during manufacturing. This eliminates the need for additional stabilizing components and simplifies the overall manufacturing process.
Solution Approach 2:
The patent combines the support function previously performed by a separate stabilizing mandrel into the lancing device itself. The lancing device and support function are merged into a single component, reducing the total number of parts and simplifying the manufacturing process.
3Device complexity
If the cannula is processed while flexible without additional support, then the manufacturing process is simpler, but the cannula cannot be properly positioned and connected to the housing
Solution Approach 1:
The cannula is preliminarily positioned on the lancing device before the housing molding process. This preliminary positioning ensures the cannula is correctly oriented and secured without requiring complex support structures, achieving both simplicity and precision.
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 approach significantly reduces cannula damage, lowers reject rates, enhances durability, simplifies manufacturing, and provides a reliable, pressure-resistant connection suitable for administering substances like insulin, while eliminating the need for additional components and steps.
Implementation Method 1
a cannula housing is molded onto the cannula
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2~3
AI summary
In order to improve the production of a component having a cannula and a cannula housing, the invention proposes a method for producing a component having a cannula for the subcutaneous administration of an active substance, in which the cannula is connected to a cannula housing, wherein the loose cannula is threaded onto a piercing means to form a ready-to-use cannula-piercing unit and then a cannula housing is moulded onto the cannula.