Valves TRIZ Cases

Standard catheter connections can restrict flow and leak; an O-ring-sealed lamprey lock uses a larger inner diameter to address both.

A guarded pincher and protrusion fold tubing for dependable occlusion across varied diameters without size-specific clamps.

Sliding an actuator on the top wall improves accessibility and ease of operation, resolving the trade-off between device compactness and user handling.

A multiway pinch device uses a selector hub and cam mechanism to control flexible tubes.

A collapsible valve uses a smiley cut to open the flow path while maintaining sealing contact at distinct head and rim locations.

A freely floating tappet actuates a barrier membrane to eliminate stick-slip friction and maintain precise anticoagulant dosing accuracy.

Segmented resilient valve with piercing conduit prevents liquid backflow and air injection, maintaining medication purity in needle-free connectors.

Hourglass valve stem prevents air embolism by collapsing under negative pressure without adding complex check valves.

A collapsible valve stem with a concave curvilinear surface returns to its closed position within the valve body.

Deforming a plastic closure releases large cross-sections without generating particles or sharp burrs that cause hemolysis.

Radial expansion of the elastic hollow element maintains airtight sealing under high internal pressures exceeding 300 psi.

Segmented smiley cuts enable controlled folding of a collapsible valve, minimizing trapped fluid volume while maintaining reliable self-sealing performance.

An internal bi-valvular system with a spiral structure prevents back-flow contamination and blood spill during peripheral IV access.

A two-way pressure relief valve manages reservoir gas using a sealing ball and diaphragm to prevent damage from positive or negative pressure differentials.

Valve head geometry aligns seal surface with port edge to prevent fluid leakage and bacterial trapping in recesses.

A medical luer connector uses a resilient valve member to control fluid flow and maintain sterility.

Segmenting the disposable stopcock from a reusable holding device resolves contradictions between contamination prevention and automated actuation capability.

A clamping device restricts end portion displacement using a dedicated member to maintain projection alignment.

A fluid flow control system uses a flexible ring and resistance barrier to create a tight seal around medical devices.