Stents TRIZ Cases

Variable-length engagement members resolve contradictions between retention reliability and positioning control during medical device deployment.

Embedded circumferential constraining elements maintain device retention without adding bulk, resolving the trade-off between reliability and compressibility.

A tiltable actuator drives relative movement between insertion elements to detach medical implants.

A bimetal composite wire stent uses a dual-material shell and core to provide enhanced mechanical strength during vessel remodeling.

Silane copolymer coatings chemically bond to metal medical devices, preventing protein adsorption and maintaining sliding properties.

Varying pitch angles along helical stents square off ends, reducing dog bone effects during uniform expansion.

A pusher with longitudinal grooves accepts a sheath assembly featuring inwardly projecting keys for controlled axial retraction.

Segmented surface grooves accelerate endothelial cell migration to prevent thrombosis and reocclusion in intravascular stents.

Rotating web connectors in expandable lattice structures enable dynamic cross-section changes during deployment.

Hybrid aortic arch stent graft blocks thoracic flow to reduce circulatory arrest and ischemia time.

A branch stent-graft system uses a suture to evert the device through a collateral opening into a vessel ostium.

A thrombectomy sheath features a sonovisible element at its distal end to aid precise positioning within veins.

Segmented mesh and reinforced wire folding increase radial force, preventing migration and buckling of flow diverters during aneurysm treatment.

Segmenting a vascular filter into portions with different degradation rates eliminates removal surgery while maintaining structural integrity.

An integrally formed polycarbonate cleaning tube eliminates leakage while a sacrificial coating prevents inner cannula scratching, extending service life.

A catheter system manages stent expansion and retraction through internal reins for precise diameter adjustments.

Hinged coupling elements allow the stent to bend in curved lumens without generating harmful straightening forces on vessel walls.

Layered composite catheter tubing pairs rigid inner amorphous nylon with flexible outer semi-crystalline polyamide to resist kinking during navigation.

Integrated cannulation members in universal fenestrated endografts enable direct branch artery connection, eliminating custom device manufacturing costs.

An expandable extracellular matrix member transitions from a compressed state to seal gaps between prosthetic valves and cardiovascular tissue.

A polymeric valve system uses an embedded supportive frame and continuum leaflets to create a seamless structural interface.

Flexible shells and thin films allow the device to expand with arterial pulsations, preventing ischemic stroke during extended deployment.

A control module transitions between states to manage guidewire axial movement relative to a catheter during cardiac valve deployment.

A catheter-based fixation system uses proximal element actuators to grasp and approximate mitral valve leaflets for precise implant placement.

Replacing flexible pouches with a hybrid sealed rigid tray removes compound folds that cause stress cracking and pin holes during vibration.

A stent delivery system uses a deflecting and tensioning device to pre-tension the flexible pull member for secure handling.

A folded section with a slit valve arrangement provides access to the stent graft lumen for additional device insertion.

Connecting struts bridge closed cell stent structures to resolve the contradiction between radial force and bending flexibility in curved vessels.

Segmented bifurcated graft reduces migration risk via nested delivery and asymmetric barbs.

Concentric layers of fluoroscopic and MRI materials resolve imaging trade-offs.

Segmentation and nesting enable controlled deployment of a replacement valve, reducing tissue trauma during minimally invasive procedures.

Angled reinforcing strips on a conical section constrain wall thinning to maintain structural integrity under high internal pressure.

A stent delivery system uses partial sheathing to store devices with expanded valves.

Real-time laser or sonar feedback adjusts the applicator position to ensure uniform therapeutic agent delivery on non-uniform balloon shapes.

Capped-release mechanisms deliver burst anti-granulation agents to prevent fibrin sheath formation and occlusions.

A pressure-propelled imaging apparatus uses a piston head to form a seal and advance through the gastrointestinal tract.

A bifurcation stent delivery catheter uses a guidewire routed over an inflatable balloon to align the stent side hole with the vessel ostium.

A stent uses phase-transforming cellular material to open and close its outlet dynamically.

Segmented joint members with specific hole configurations reduce frictional forces to ensure precise stent placement accuracy.

Self-expanding scaffolds compress clots against vessel walls to restore blood flow and facilitate natural lysis without distal embolic protection.

A stent delivery catheter uses a segmented hypotube and inner member to navigate vasculature while deploying self-expanding implants.

Chromium molybdenum nickel tungsten alloy composition boosts radial strength while reducing wall thickness for smaller vessel deployment.

Shorter platinum alloy strands prevent protrusion while enabling X-ray visualization of the stent.

A degradable stent uses a partition layer to spatially separate agent coatings from the luminal surface, preventing pH shifts from damaging unstable drugs.

Alternating tubular units with U-shaped cells distribute stress uniformly, preventing cracks and local corrosion in bioabsorbable metals.

Loop elements anchor within bifurcating side branches to prevent migration in wide-neck aneurysms.

A one-way clutch transfers rotation to screw threads, enabling controlled sheath retraction while preventing counter-rotation errors.

A dry valve crimping system compresses prostheses to expel glycerol.

Nested prosthetic heart valve frames invert for compact delivery, reducing procedure invasiveness and improving patient tolerance.

Apertured balloon segments maintain continuous blood flow through the device, resolving blockage risks while ensuring precise dimensional control.