Microperfusion Needle With Elastic Wings And Protective Cavity
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Solution Overview
Problem
Existing microperfusion and fistula needles can cause accidental injury to operators and patients due to unintended translational movement between the needle and protective components during use.
Innovation Solution
A microperfusion or fistula needle with a protective element featuring elastically deformable wings that pivot to secure the cannula within a protective cavity, utilizing lateral slots and projections to prevent sliding and ensure controlled movement, and a locking mechanism to maintain the cannula in a safe position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the protective element is designed with lateral slots to allow wing movement, then the ease of operation is improved, but the risk of unintended translational movement increases
Solution Approach 1:
The protective element is segmented into a tubular body with lateral slots that allow the wings to pivot independently. This segmentation enables the wings to move laterally for insertion while the tubular body maintains overall structural control, preventing unintended translational movement of the entire assembly.
Solution Approach 2:
The lateral slots act as intermediaries that guide and constrain wing movement. They allow controlled lateral pivoting necessary for insertion while preventing uncontrolled translational movement, thus mediating between the need for ease of operation and positional reliability.
2Ease of operation
If the protective element allows free movement during insertion, then the ease of operation is improved, but accidental injury risk increases
Solution Approach 1:
The protective element is pre-assembled with the needle component in a controlled state before use. The lateral slots are pre-configured to allow only controlled lateral movement, and the retaining projections are pre-positioned to engage with the wings, ensuring that freedom of movement does not lead to accidental injury.
Solution Approach 2:
The lateral slots serve as intermediary structures that permit necessary movement for assembly and insertion while constraining movement to safe parameters. They mediate between the need for ease of operation and the prevention of harmful accidental movements.
3Reliability
If retaining structures are added to prevent sliding, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Retaining structures are applied locally at specific positions where they are most effective - the lateral slots are positioned to guide wing movement, and retaining projections are placed at critical engagement points. This localized application provides reliable control without requiring complex structures throughout the entire device.
Solution Approach 2:
The protective element utilizes a flexible tubular body with integrated lateral slots rather than rigid separate retaining structures. This flexible design provides the necessary control and retaining functions while maintaining structural simplicity and avoiding excessive device complexity.
Data Source
AI summary
A microperfusion needle or fistula needle with a protective element comprises a first component comprising a cannula, a body rigidly joined to the cannula, and having grasping wings extending therefrom, a second component comprising an elongate body having a cavity for slidably receiving the first component between an operating position of the cannula and a safety position of the cannula, the elongate body having lateral slots for the grasping wings to extend therethrough, the grasping wings being suitable for elastically bending around and contacting opposed portions of the elongate body. The elongate body comprises two arrays of projections, which are contacted by the wings when bent. Opposed pairs of projections are designed to contact and mechanically interfere with the grasping wings when bent.