Mechanism Start — A Narrowed Bony Ostium
Chronic swelling and bone thickening pinch the sinus drainage channel shut.
- ~1.0 mm: Baseline ostium (severely narrowed)
- 2–3 mm: Healthy ostium (normal drainage size)
- ~10%: Drainage flow (of normal, obstructed)
- thin: Bone thickness (candidate for fracture, not resection)
Why the channel is blocked
Inflammation and thin bone remodeling narrow the ostium over time.
Mechanical target, not tissue target
The bony rim, not the mucosa, is the structure this device widens.
This mechanism view isolates the physical widening step, not the full clinical workup.
Threading the Guidewire and Balloon Catheter
A flexible illuminated wire opens a safe path; the catheter rides over it.
- 0.025 in: Guidewire diameter (flexible, blunt tip)
- ~1.5 mm: Balloon crossing profile (deflated, low profile)
- Endoscopic: Guidance (plus tip illumination)
- ~3 min: Insertion time (to seat catheter)
Guidewire leads, catheter follows
Seldinger-style: wire first confirms the path, catheter tracks over it.
Centering on the ostium
Balloon segment aligns exactly across the narrowed bony passage.
Catheter cannot leave the wire rail — a built-in mechanical safety limit.
Balloon Positioned and Pressurized
Saline inflates the balloon; gauge-controlled pressure pushes the channel open.
- 8–12 atm: Typical pressure (device-rated to ~20 atm)
- 2 × 5–10s: Inflation cycle (sequential holds)
- 2–4×: Diameter gain (over baseline, at full pressure)
- radial: Force direction (outward against bone)
Pressure drives radial expansion
Rising atm inflates the balloon evenly against the bony canal wall.
Slider drives the widening live
Higher inflation pressure widens the simulated ostium in real time.
This is the controllable step — pressure slider directly sets final diameter.
Bone Microfractures, Mucosa Stretches Intact
Thin bone yields in tiny fractures and remodels; the mucosal lining stretches, unbroken.
- micro-fracture: Bone response (not cut or drilled)
- stretch, intact: Mucosa response (elastic, re-drapes)
- 0%: Tissue removed (no resection)
- <5%: Mucosal tear rate (reported in case series)
Brittle bone fails before elastic mucosa
Radial load fractures rigid bone while soft mucosa simply stretches.
Outward remodeling
Fractured bone settles into a wider, permanent channel shape.
No cutting instrument is used at any point in this widening step.
Catheter Withdrawn, Drainage Pathway Restored
Balloon deflates and exits; the widened bony channel remains, mucosa intact.
- up to 6.5 mm: Final ostium (depends on pressure used)
- ~90%+: Drainage flow (of normal, restored)
- 1–3 days: Recovery time (vs. 1–2 wks traditional)
- ~80–90%: Patency at 24 mo (pooled case series)
Permanent widened geometry
Remodeled bone holds the larger opening after the balloon is gone.
No resection, faster recovery
Preserved mucosa means less healing time than tissue-removing surgery.
Mechanism complete: pressure in, micro-fracture, wider drainage path out.