Injection Device Storing Cannula Vent Outlet Fraction
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Solution Overview
Problem
Existing injection devices with vent outlets complicate the injection process by causing dispersion of ejected solution fractions, requiring physicians to manually collect and handle pharmaceuticals, making the process less simple and increasing exposure to the solution.
Innovation Solution
Incorporating a storing cannula within the injection device to contain the ejected fraction, which is easily applied without significant modifications, ensuring the fraction is collected and contained during administration, preventing dispersion and minimizing physician exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vent outlet is provided for ejecting the fraction of solution, then the injection device can reach end-administration configuration, but the ejected fraction disperses and requires manual collection by the physician
Solution Approach 1:
A storing cannula is introduced as an intermediary component between the vent outlet and the external environment. The cannula receives and contains the ejected fraction of solution, preventing its dispersion while allowing the vent outlet to function. This intermediary structure eliminates the need for the physician to manually collect the solution, thus reducing exposure risk while maintaining the necessary ejection function.
Solution Approach 2:
The function of containing the ejected fraction is extracted from the main syringe body and assigned to a separate storing cannula. This allows the vent outlet to continue ejecting solution as needed while the extracted containment function is performed by the dedicated cannula, preventing dispersion without interfering with the injection process.
2Object-affected harmful factors
If absorbing material is used to collect the ejected fraction, then the fraction can be contained, but the injection process becomes more complex
Solution Approach 1:
The storing cannula serves as a passive intermediary structure that automatically contains the ejected fraction through its physical presence and geometry. Unlike active collection methods requiring additional materials or steps, the cannula simply provides a receptacle that intercepts and holds the solution, maintaining device simplicity while preventing dispersion.
3Object-affected harmful factors
If the physician manually collects the ejected fraction, then the solution can be contained, but the physician comes into contact with the pharmaceutical solution
Solution Approach 1:
The storing cannula acts as a barrier intermediary between the ejected solution and the physician. It contains the fraction automatically during the ejection process, eliminating the need for the physician to perform manual collection actions. This ensures solution containment while protecting the physician from contact, improving both safety and operational ease.
4Object-affected harmful factors
If a storing cannula is added to contain the ejected fraction, then dispersion is prevented, but the device requires additional components
Solution Approach 1:
The storing cannula is designed to perform multiple functions: it contains the ejected fraction, provides a defined collection volume, and can be integrated with the vent outlet structure. By consolidating these functions into a single component rather than adding separate collection devices or materials, the overall device complexity is minimized while achieving effective containment.
Data Source
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AI summary
An injection device (1) for an injectable solution (S) includes one tubular body (3) inside which at least one containment chamber (8,9) for the injectable solution is defined; one dosing reservoir (20) for one fraction of injectable solution (S); at least one plug (6,7) sliding into the tubular body (3) and including a protruding appendix (16) suitable for entering in the dosing reservoir (20) to eject said fraction of solution; one vent outlet (23) to eject said second fraction of solution. The device (100) includes an accessory (260) with one storing cannula (261) engageable with the vent opening (23), and provided with a first end (266) and a second end (267) between which a storing reservoir (261') for the second fraction of solution is defined. The device (100), that is particularly suitable for injecting very precise and reduced doses of an injectable solution, is for example of the single-chamber or double- chamber pre-filled type.