Guide Needles TRIZ Cases

Variable helical angles and a tapered shaft help the dilator widen digestive-tract penetration holes with less unnecessary rotation.

A folded frame with catheter and stabilization hubs uses distributed anchoring to limit catheter movement, pivoting, and dislodgement.

Soft and stiff hub layers, notches, and wings support controlled sheath splitting for larger heart pumps.

Persistent bladder infections can recur when a small patent urachal duct remnant remains untreated; catheter delivery of glue or a sclerosing agent ablates its orifice.

An inner diameter of at least 1.4 mm and outer diameter up to 2.8 mm support venous lesion passage, while a lubricious distal coat reduces friction.

Large dense clots can limit aspiration force and cause clogging; a dual-catheter assembly uses a distal valve and irrigation to support removal.

To address slow procedures and ring-sizing complications, catheters deploy anchors, ropes, and zipper-coupled bars for stable annular constriction.

Three nested shielding parts extend during needle withdrawal to enable one-handed catheter use and block blood or body-fluid exposure.

Water or air is confined around the endoscope tip by sealing rings, bands, and an occlusion balloon to improve coupling while limiting aspiration and over-distention.

A preloaded spring moves a guide pin through retention, travel, and lockout portions to cover the needle after use.

Controlled deflection and rotation help address manipulation risks during leadless pacemaker implantation and retrieval.

Subretinal access near the macula is difficult; a convergent lumen delivers a leading fluid bleb and therapeutic agent through one cannula.

A slotted polymer tube shields the guide wire from needle-blade scraping while reducing the risk of liner detachment.

A rib-equipped transition segment combines plastic flexibility with metal support to improve force transmission and reduce deformation.

An actuated flap opens through the sheath wall so blood can flow around a retained introducer sheath during prolonged medical procedures.

The layered transition uses an unconnected rib and hot-melt welding to balance catheter flexibility, strength, and pushability.

Opposed needle-guard locking windows and spacer hooks create a high-holding-force snap connection without enlarging the syringe circumference.

A coiled instrument expands after catheter delivery to support blood collection, reduce vascular trauma, and limit repeat needle sticks.

An expandable catheter anchor stabilizes a steerable, sharpened tool to cross fibrotic venous occlusions and restore flow.

A deployable rigid member breaks dense thrombi into segments while proximal fluid flow guides fragments into the catheter and limits blood aspiration.

Longitudinal cuts and helical slits guide low-force peeling while preserving sealing and preventing double breaks.

A segmented guidewire uses a sharp tip and cutting section to enlarge punctures, reducing hoop stress and force during tissue crossing.

Sequential needle-and-dilator deployment supports neonatal umbilical cannulation while minimizing blood loss and cord spasming.

Concealing the spring-loaded needle enables longer IV catheter placement for implanted ports while reducing patient anxiety.

An elastically deformable elliptical pull-ring helps a steerable catheter keep a small outer diameter while preserving lumen space for larger articles.

Separate atrial and ventricular leads support AV-synchronous pacing, while steerable placement and a retractable sheath help limit endothelial injury.

A telescopic inner shaft and slit let one guiding catheter reach remote vascular sites without a separate guide extension.

An interlocking dual-stylet assembly aligns and protects the guidewire while advancing flexible split-tip catheters through tortuous vasculature.

Patient movement can migrate intracardiac pump catheters; in-graft fixation expands against the vessel wall for stable, repositionable placement.

Manufacturing gaps between a vascular dilator tip and sheath can cause catching; a spring-biased tip maintains a smooth transition.

A movable seal closes the guidewire side opening to limit fluid leakage while preserving rapid-exchange access during radial procedures.

Energy emitters on a torus balloon deliver intravascular lithotripsy to break down calcium while supporting blood-flow bypass.

An integrated catheter-hub valve automatically occludes blood flow while a needle guard shields the needle during withdrawal.

Separate visualization channels distinguish introducer-needle entry from catheter entry, reducing blood-flashback confusion during venous placement.

A bendable cylindrical attachment changes distal-end orientation, improving endoscope access to hard-to-reach anatomy.

Existing access devices lack integrated measurements; combining a flow meter and pressure sensor enables real-time monitoring through the access lumen.

Grooves, extensions, and friction features keep the needle hub attached during catheter insertion while enabling controlled removal afterward.

Variable stiffness sections help a transcarotid catheter navigate from the common carotid to intracranial vessels while resisting kinks.

A slit valve body replaces coil springs, simplifying assembly while preserving automatic closure and avoiding adhesive leakage into the fluid path.

Nested sheath segments adjust vascular access size during thrombectomy without repeated exchanges, helping preserve access and reduce procedure time.

A movable inner catheter enables blood withdrawal and infusion through prolonged dwell access while the outer catheter remains positioned.

During introducer-needle removal, a movable septum shifts and seals its slit under reflux pressure to limit catheter blood leakage.

Concave geometry conforms to the embryo while a hydrophobic tip coating limits leakage and helps prevent adhesion during uterine delivery.

Roller wheels advance a catheter-guidewire composite while a splittable casing separates, reducing insertion steps and device exchanges.

A one-handed shuttling mechanism advances a midline catheter over a fixed needle while preserving ultrasonic visualization and reducing hand exchanges.

An elongated-core and coil guidewire clears catheter obstructions and admits blood through multiple paths for faster, cleaner draws.