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.

Segmented slit arms and a fastener hold the IV port in place, enabling single-handed connection while preventing accidental needle pricks.

A syringe locks the plunger extension inside a conical tip during injection to prevent reuse.

A syringe barrel with a rotatable arm and latch creates a snap-fit connection between the needle hub and barrel without relative rotation.

Segmented needle cap remover uses an intermediary inner part to prevent early shield movement, reducing needle-prick injury risk.

A hypodermic interface assembly uses a cannula carrier to controllably separate from the hub during injection procedures.

A resiliently flexible finger with a camming surface stores elastic energy during needle exposure to automatically return the shielding sleeve.

Asymmetric liquid pathways dimensioned to equalize pressure drops across multiple injection needles for homogeneous product delivery.

A cap for an injection device uses a movable conduit to equalize pressure, reducing the force needed to remove the cap.

A safety infusion port needle uses a guiding driver to pivot enclosure petals into a tubular housing around the withdrawn needle.

Spring-loaded holding points secure syringe needle caps, eliminating manual recapping risks and preventing accidental needlestick injuries.

Pre-loaded spring member resists creep by storing energy in an uncompressed state, ensuring reliable sleeve return.

A needle system shifts a rod to block the distal end opening, preventing bacterial contamination while allowing fluid injection.

Segmented shield apertures channel expelled medication away from the assembly to prevent dose confusion and enhance injection site visibility.

Spring-actuated shield covers the proximal needle end via pivoting locking fingers, preventing inadvertent needle sticks after use.

A retractable needle device uses a spring mechanism to propel the needle rearward into a housing cavity upon user pinching.

A locking collar engages after full retraction to prevent reuse, eliminating accidental needle sticks during cap removal.

A pen needle uses a movable protector element to cover the cannula after injection.

A cam-ratchet mechanism grips needle sheaths via indexed jaw movement for one-handed operation.

A syringe clamp applies electrical current to melt hypodermic needles into compact masses.

An eject button triggers a biasing element to move the dispense interface away from the housing, preventing fluid communication during manual detachment.

A drug delivery device uses a vacuum connection between the plunger and needle assembly to enable safe needle retraction.

Dual passive shields on a pen needle automatically cover both ends upon injector removal, preventing accidental needlestick injuries during disposal.

A plastic syringe safety device uses a resilient arm and curved ramp to retract the needle shield automatically.

A pivotable sheath covers the cannula via locking tabs and flat surfaces for secure engagement.

A single-in-line filter needle integrates filtration and administration into one device.