Guide Needles TRIZ Cases

Retracting the outer needle leaves only a thin inner needle indwelled, reducing user burden during drug administration.

Radially expandable rings in an introducer sheath reduce vessel trauma and kinking risks during prosthetic device delivery.

A neurosurgical catheter with a distal section smaller than its guide tube creates a recess to retain brain tissue and form a physical seal.

Segmented cavity geometry minimizes removal effort and prevents blood leakage in catheter introducer assemblies.

Segmented catheter sections with rigid contact zones stabilize the expandable impeller across the aortic valve, resolving connection reliability trade-offs.

A tip shield encases a withdrawn needle tip within a closed chamber using a cantilever clip, preventing accidental needle sticks and blood exposure.

A lateral moving seal assembly uses a bellows mechanism to accommodate varying instrument diameters, preventing gas leakage during angular manipulation.

A transseptal puncture system uses a blunted needle housing a preloaded J-tipped guidewire to deploy the wire through the septum.

Segmenting protection from wing fixation reduces skin irritation while ensuring reliable distal coverage via latching.

Pressurizable treatment chambers remove entrapped air from endoluminal devices using conformable seals, reducing blood loss during introduction.

A forward arm extends distally from the IV catheter hub to provide a stable grip near the insertion site.

A tapered outer needle assembly with a proximal ventilation path expels air from the bore during puncture.

Segmented inflation provides atraumatic needle tract expansion, reducing esophageal trauma from multiple endoscope passes.

A catheter holding tool uses independent fixing to secure tubular portions during detachment.

A guide extension catheter features a helically-shaped entry port that facilitates smoother device advancement into the distal shaft passageway.

A triaxial braid reinforcing member inhibits sheath elongation, maintaining inner diameter consistency to reduce resistance during stent deployment.

An expandable railed sheath with a porous wall protects vessel walls during device deployment.

A convex curved needle tip creates a retention gap with brain tissue to prevent radial liquid spread and ensure accurate injection positioning.

Elastic restoring force snaps jaws shut after needle removal, preventing accidental pricking and securing the device within the housing.

Radial penetration limiting elements fold against the needle shaft to prevent excessive myocardial depth, reducing heart perforation risk.

Segmenting the sheath via a dedicated splitter device prevents pacing lead displacement during removal.

A segmented catheter package separates hydrophilic coating from wetting fluid during radiation sterilization to maintain lubricity.

RF tracking coils detect catheter position in MRI scanners, reducing patient radiation exposure from X-ray guidance.

Segmented microelectrodes at specific spinal levels inhibit pain transmission while avoiding motor nerve interference.

Segmenting navigation into a steerable sheath allows the non-steerable catheter to use softer materials, improving precision while reducing puncture risks.

Cantilever arms engage the catheter adapter in a snap-fit, positioning the bulkier luer fitting remotely to reduce skin irritation and dislodgement risk.

A double-tube indwelling needle uses a retractable inner needle to conduct blood circulation.

A remodelable collagenous biomaterial promotes tissue ingrowth within a cannulated delivery needle.

Segmented valve plates nested within a sheath hub prevent backflow contamination while simplifying manufacturing complexity.

An introducer sheath features an insertion tube with longitudinal incisions that tear open to expand the internal diameter for large-caliber catheter access.

A miniaturized epicardial lead uses an axial helical screw and flexible guide catheter for pericardial implantation.

Shape memory alloy needles change orientation to inject stem cells diagonally into damaged myocardium while reducing manual control risks.

A flexible intravenous catheter hub integrates a snap-fit needle cover and lateral flashback chamber for secure disengagement.

Telescoping segments enable angular trajectories, reducing multiple insertions for brain drug delivery.

Merging control wires into a single structure with longitudinal anchors reduces outer diameter while maintaining three-dimensional bending precision.

A deformable polymeric seal transitions between non-planar and split configurations to interface with splittable introducers.

Pivoting wings prevent unintentional displacement while a prestressed closure device automatically seals the receiving part.

Double-curve steering and suction prevent fluid accumulation during epicardial ablation, resolving safety risks from endocardial adaptation.

Inflatable balloon catheters pre-dilate tortuous salivary ducts to enable safe sheath insertion without excessive force or tissue trauma.

A spring-biased stylet protrudes beyond a sharpened cannula tip to protect tissue, then retracts to expose the sharp edge for penetration.

Segmented catheter adapters with pierced septum valves minimize blood exposure while enabling reliable flashback observation during clinical procedures.

A post carrier uses spring fingers to hold a piercing ornament securely.

Segmenting the needle into rigid and flexible portions resolves navigation versus puncture precision contradictions during interatrial septum penetration.

Flexible retention arms retract and expand to secure catheter actuators, relaxing manufacturing tolerances.

A bendable puncture catheter with a pull-wire mechanism adjusts its distal tip angle to stabilize position at the right ventricular outflow tract.

A sliding needle cover encloses the sharp tip on an iv catheter hub to prevent accidental injury during storage and transport.

A tubular base body features a recess for direct visualization of the shaft position during insertion.