Infusion Needles TRIZ Cases
- Thin Wall Cannula Length-to-Diameter Ratio Optimization
Optimizing the length-to-diameter ratio of a thin wall cannula reduces injection force and time for viscous medicaments.
- Passive Needle Cover Spring Mechanism
A spring member propels a needle cover to shield the tip, preventing needle stick injuries.
- Injection Device Bead Sealing Mechanism
Interlocking beads on a syringe interface seal the needle sheath, eliminating O-rings and reducing assembly complexity.
- Segmented Latch Reduces Needle Retraction Force
Radial openings in integral latches enable twisting motion to reduce retraction force by 75%.
- Interdigitated Pen Needle Storage Container
An interdigitated storage container segments new and used needles into distinct positions, reducing device volume while preventing accidental reuse.
- Huber Safety Needle Hinge Retracts Tip
A Huber safety needle assembly uses a hinge mechanism to retract the sharp tip inside the body structure.
- Safety Needle Device with Guide Sleeve for Subcutaneous Port Puncture
A safety needle device uses a movable cover and guide sleeve to enclose the needle tip during subcutaneous port puncture procedures.
- Needle Guard Locking Mechanism for Injection Safety
An early-triggering mechanism locks the needle guard after a partial stroke, preventing accidental contact and contamination when external force is absent.
- Medication Pen Needle Shield with Interlocking Projections
An axially displaceable shield locks via deflectible projections to enclose the needle, resolving complexity and reliability trade-offs.
- Helical Path Sharps Retraction Mechanism
A spring-driven carriage moves along a helical path inside a retraction housing to pull a medical sharp into a protective outer shell.
- Adhesion-Based Needle Retraction in Drug Delivery Devices
An adhesion connection between the plunger and needle assembly simplifies retraction by replacing complex mechanical locks with a thin liquid film.
- Needle Cover Assembly Rotational Removal Mechanism
A needle cover assembly uses a spinning attachment to rotate the removal cap independently from the rigid needle shield.
- Syringe Protecting Device Pre-locking Ring Mechanism
A single ring component provides pre-use and post-use locking via dual grooves, reducing structural complexity while ensuring reliable needle storage.
- Skin Fixation Device with Automatic Base Plate Separation
An insertion device employs a separable base plate to anchor infusion cannulas, preventing flexing and irritation during tissue placement.
- Passive Safety Needle Assembly with Integrated Locking Ring
A passively activated safety needle assembly retracts the outer shield over the needle upon withdrawal to prevent reuse.
- Syringe Adapter Needle Alignment Intradermal Injection
C-shaped adapter stabilizes needle cannula at precise angle, resolving inconsistent dermal placement and pain from variable skin thickness.