Cannulas TRIZ Cases

Composite fabric layers in the tubular sheath provide puncture resistance against sharp instruments while maintaining flexibility for easy insertion.

Segmented ducts in the adapter maintain independent sealing paths, preventing blood flow leakage when multiple instruments are introduced simultaneously.

A tissue moving device uses a movable fabric track on a rigid body to manipulate biological material in constrained laparoscopic spaces.

Nested seal sections with living hinges accommodate varying instrument diameters, preventing tears from sharp edges during repeated insertions.

A suction evacuation assembly with side arms and a negative pressure system removes stones through a sheath.

Molded distal tip eliminates welding while dual spike saline connection prevents air entry in hydrosurgery devices.

Rigid trocar and flexible sheath reduce scleral trauma while maintaining natural eye shape.

A flexible gripper uses sequential pneumatic ring inflation to create peristaltic motion for moving compliant materials.

Suction pulls hemorrhoidal tissue into grasping arms, allowing a ligating band to constrict the tissue and reduce patient discomfort during treatment.

Concave channels in a trocar seal membrane reduce the wrapped area and actual contact surface to minimize frictional resistance.

Compressible seal anchor with undercut ports maintains fluid-tight seals during minimally invasive surgery while accommodating various surgical instruments.

A needle guide lock mechanism secures the needle position during syringe exchange operations.

Telescoping housing advances a non-rotating bit to prevent over-drilling and improve stability in patient-specific procedures.

A cannula assembly uses a nested adapter with dual seals to accommodate varying instrument diameters.

Slider mechanism retracts needle tube and locks operation section, preventing tissue damage from unintentional automatic puncture activation.

A laparoscopic tool system integrates a time-of-flight sensor set to calculate real-time distance and spatial data using light emission and reception.

A medical lavage system blends therapeutic agents directly into irrigation fluid using an integrated cartridge assembly for precise delivery.

Segmented cannula sections articulate to navigate complex joint geometries while a specialized driver ensures stable, easy insertion.

Guard members with flexible flaps stretch the septum seal to accommodate varying instrument sizes while preventing damage and inversion.

An inflatable bag creates artificial pneumoperitoneum to isolate tissue during laparoscopic extraction.

Telescopic cannula adjusts to anatomical variations while the sealing cap maintains pressure control during natural orifice surgery.

A resin-coated endoscope holding part prevents electrical leakage in metallic surgical systems while maintaining overtube stiffness.

Segmented cam wire and retaining members enable quick release of the trocar assembly for cleaning without compromising structural stability.

An anoscope dilator adjusts insertion length via an elastomeric stop element, resolving the trade-off between device versatility and structural simplicity.

Segmented base and working sleeves prevent contamination by containing extracted material while a guide wire ensures precise milling direction.

An annular fixation device secures a smooth cannula via a spring wire mechanism, eliminating balloon rupture risks and suture complexity.

Segmented shaft enables precise articulation and rotation within small lumbar cavities, reducing tissue damage during minimally invasive spine procedures.

A trocar plate with a movable port slides along a guide hole to adjust instrument positions, preventing interference during minimally invasive surgery.

A posterior-to-lateral surgical tool guides instruments through muscle tissue to access the intervertebral disc space.

Tissue guard integrates ground connection and smoke evacuation channels to resolve specimen removal efficiency versus device complexity trade-offs.

An expanding outer sheath enables direct pericardial access while reducing tissue damage and allowing simultaneous instrument insertion.

Helical fluid pathways within elongate members deliver controlled fluid bursts to clear obscuring tissue and improve endoscopy visibility.

Shape memory alloy fins expand at body temperature to increase the working angle while keeping the portal size small.

A self-expandable retrieval device uses undulating segments to navigate tortuous vasculature and capture embolic obstructions.

Flexible gas seal pad with instrument port and adhesive layer eliminates awkward trocars.

A hook mechanism on the endoscope cable allows surgeons to adjust the visual field using only one hand.

Floating multi-lumen catheter guides tools and endoscope within an expandable retractor to create a flexible operative environment.

A catheter with an annular cavity and tubular braid adjusts flexibility by moving the braid relative to inner and outer members.

An asymmetric ultrasonic surgical blade balances transverse vibrations through a counterweighted neck and angled cutting edge to prevent stress failure.

Segmented elastic ring seal transforms soft-hard friction into hard-hard contact, reducing motion resistance for 5-12 mm instruments.

Treatment instrument debrides fistula tissue, harvests specimens, and injects therapeutic agents via a multi-functional end effector.

Expandable port guards protect containment bags from surgical instruments, preventing cancer cell seeding during specimen removal.

Segmented cannula with ribbed external surface and internal valve maintains insufflation while reducing relative movement during repeated sterilization cycles.

A rotating medicinal applicator tip circulates fluid to maximize chemical exchanges at the wound site.

An expandable sheath transitions from a compact insertion state to a larger working diameter, eliminating gaps that cause organ damage.

A dilator system with eccentric channels and gaps enables precise directional tissue dilation during spinal procedures.

A selectively lockable surgical access assembly with a tapered obturator enables atraumatic dilation of brain tissue.

Periodic suction cycles manage fecal waste while preventing anorectal injury from continuous negative pressure.