Medical Devices TRIZ Cases

An elastic valve connector prevents central slack formation by expanding the peripheral section volume when held, ensuring reliable reusability.

A handheld skin piercing tool uses a lever mechanism to convert drive strokes into variable working strokes for precise needle depth control.

Radially flexible tab restricts flexing in non-triggering position to prevent accidental dispensing during loading.

A patency checking system uses a hub and plunger to draw blood from an IV line without disturbing the catheter.

Atomizer deposits sequential aqueous and lipid mist layers onto the cornea to form a stable biomimetic tear film.

A wound therapy device integrates sensors to detect exudate physiological parameters for continuous monitoring.

Merges valve stem and second body into one part, reducing component count and manufacturing cost while maintaining sealing reliability.

Local energy application melts the inner resin surface to fill gaps, preventing foaming and ensuring liquid-tight joint strength.

A model face and airway system evaluates medication delivery using a simulated bone structure, trachea, and soft tissue layers to resolve seal leakage issues.

Disposable cassette uses a flexible pressure-transmitting membrane to detect fluid depletion, preventing overpressure risks during surgery.

A rotary nebulization device integrates liquid supply and power operation through a single rotating ring mechanism.

A collapsible thin film reservoir dispenses precise liquid volumes using a peristaltic pump mechanism.

Piezoelectric vibrator monitors fluid levels by tracking thermal response, eliminating complex separate sensors and ensuring accurate dosing.

Soluble hemoglobin carriers in dialysate displace CO2 from erythrocytes, reducing blood flow requirements and coagulation risks.

Nutation movement with perpendicular vibration and limited translation minimizes vessel injury during efficient fat removal.

A control portion moves a drive member to align with a detachable bendable unit, resolving attachment misalignment from manufacturing tolerances.

A movable comb slides transversely to house syringes into a matrix configuration via separating teeth.

Rotatable yoke assembly positions a universal guide bore for interventional device insertion, resolving trajectory adaptability versus stability trade-offs.

Segmenting the infusion system allows lightweight modules to detach from heavy controllers, resolving mobility constraints.

A compliant silicone outer cover anchors to the port body via a flange, while radiopaque features enable precise x-ray identification of the implant.

A segmented tubular pumping chamber design simplifies assembly and reduces manufacturing costs for inhalation devices.

An integrated clip unit monitors turbidity and leukocyte luminescence in drainage tubes, resolving manual positioning errors.

Roller housings clear surgical drains without manual milking, reducing patient discomfort and tube stretching.

Comparing dual encoder outputs detects discrepancies exceeding thresholds, disabling the motor to prevent unsafe fluid delivery operations.

A mandrel-supported inflatable elastomeric pump maintains stable pressure during contraction to resolve variability in intravenous drug delivery flow rates.

A tube cassette integrates an anti-free-flow valve actuated by external pump forces to manage fluid delivery.

A compact manual insertion aid uses two jaws with adjustable clearance to securely engage and guide a cannula hub for patient use.

Differential pressure sensing cancels temperature effects to estimate fluid volume without additional sensors, reducing device complexity.

Segmented biodegradable windings enable precise timed release, resolving manufacturing complexity.

Infusion device estimates occlusion duration via compliance values, enabling users to adjust pressure thresholds for timely alarm activation.

Automated optical sensors track wound drainage color and flow rate variations to enable early detection of bleeding or infection complications.

A dialysis cassette circulates overheated liquid through pump chambers to transfer excess heat to the surrounding structure.

Implanted infusion needles and a pump deliver drugs into corpora cavernosa, eliminating manual injection errors.

Methylene blue reduces to leukomethylene blue upon gastric fluid exposure, providing visual leakage detection for intragastric balloons.

A method shapes a polymeric tubular object into a urinary catheter tip using indentation and heating to create a flexible bulbous end.

Analyzing fluid pressure modulation profiles within an implanted catheter to verify proper placement and operational integrity.

Segmented wetting mechanisms isolate fluid in a housing, preventing premature moisture exposure that reduces shelf life and increases infection risk.

Separating the pump assembly from the transducer near the patient resolves measurement precision issues caused by residual air in low-pressure environments.

A separating float uses a bypass opening to move fluidal biological material from below the float into the area above it within a container.

A wound dressing integrates a negative pressure source and an oxygen delivery manifold to create an occlusive therapeutic environment.

A disposable funnel creates a reserved volume inside a container to automatically limit fill levels without sensors.

A transcranial near-infrared photobiomodulation system increases adenosine levels to induce sleep.

Segmented engagement members with angled notches enable guidewire passage during deployment, reducing procedural time by eliminating complete wire removal.

Apertured seamless metal tubes replace thick braided layers to reduce wall thickness while maintaining torsional rigidity and kink resistance.

Alternating electrode polarity stabilizes skin pH and reduces oxidation during iontophoresis drug delivery.

Carpule depth scale and dosage indicators provide precise insertion control for wound treatment.

A compressed granular tobacco cartridge suppresses suction noise and boosts flavor emission by maintaining uniform air contact within the device.

Biodegradable hydrogel anchors an in situ expander within the intestinal wall to maintain device position during distraction enterogenesis.