Infusion Needles TRIZ Cases

Leaf spring holding means separate from drive means automatically detach after piercing, preventing puncture site irritation.

A syringe needle cover pivots on a hinge to shield the tip after use.

Tilted bearing surfaces on the flexible leg distribute forcing forces against the body wall, preventing forced movement of the injection sleeve.

A needle shield uses a flexible interface to decouple upper and lower shell flexion during removal.

A retractable-needle device uses a flexible web and movable seal, so retraction needs less thumb force and produces less needle-tip motion.

A movable needle support allows the shield to cover rearward tips, preventing accidental fingertip contact during disposal.

Segmented multi-bevel needle tip reduces penetration force while preventing tissue coring and stretching during injection.

A syringe needle cover features a cutout aligned with the base to enable visual identification of fluid entry into the injection needle.

Segmented conical connector assembly uses expanding blades to locate firmly within the barrel, preventing self-retraction errors during manufacturing.

A pen needle tip assembly uses a locking outer cover to secure the double-ended needle body after use.

A fitting portion with a steeper female taper ratio secures an injection needle assembly to a drug discharge tube through enhanced friction.

A tubular needle with a lateral slit opening directs viscoelastic filler flow through a defined compression chamber.

Rotating dispenser body engages locking structures to secure the needle in a retracted position, eliminating accidental exposure risks.

A safety syringe uses a spring-loaded plunger rod to release protective cylinder fingers automatically.

A needle assembly integrates axial and torsional biasing in one spring member to retract the shield, reducing part count while preventing needle stick injuries.

A soft cannula insertion device uses a retractable guiding needle to temporarily stiffen the cannula for precise skin penetration.

Segmented adhesive tapes with a hinged flap reduce skin stress while preventing catheter dislodgment.

A self-sealing pad covers the base of a needle assembly to contain fluids during infusion procedures.

Plunger cavity traps needle assembly via internal protrusions, controlling retraction force and velocity while preventing accidental exposure.

A needle safety shield uses a position-biased actuation assembly to deploy the protection sheath only after injection.

Adjustable locking fingers release a spring-biased shield to cover the exposed proximal needle end, preventing inadvertent needle sticks.

Spring-loaded slider covers the needle tip automatically, preventing accidental needle stick injuries during disposal.

Inner needle shield seals injection tip and stores mechanical energy to automatically cover the needle post-injection.

A biasing member urges a sheath to cover a hypodermic needle during plunger retraction.