Sphenoidal bone biting forceps

​​I. Sphenoid Rongeurs (Curved Jaw - Image 1-4)​​

​​Key Specifications:​​

​​Surgical Functions:​​

1. ​​Deep Sinus Accessibility​​

   • Curved jaws (matching Image 1,3,4) navigate ​​sphenoethmoidal recess​​ anatomy, reaching sphenoid ostium behind nasal septum.
   • Angled design avoids vital structures (Optic Nerve/ICA - critical in image 3 cross-section).

2. ​​Precision Bone Removal​​

   • Micro-serrated jaws (Image 2,4 notches) grip bony partitions during:
     ▶ Sphenoidotomy (enlarging sinus opening)
     ▶ Posterior ethmoid cell removal

3. ​​Safety Optimization​​

   • 190mm length for pediatric cases; 230mm adult use (proportional to handle size in all images).
   • Smooth shaft (Image 1,4) minimizes mucosal trauma.

Literature Support: Becker et al. (2021) in Rhinology confirms curved rongeurs reduce slippage risk in narrow spaces vs. straight instruments.

​​II. Nasal Laminectomy Rongeurs (Straight Jaw - Not Shown)​​

​​Key Specifications:​​

​​Surgical Functions:​​

1. ​​Anterior Sinus Bone Work​​

   • ​​Up-biting:​​ Resects inferior turbinate bone/high septal deviations (angled jaw clears orbit floor).
   • ​​Down-biting:​​ Excises maxillary crest/uninates (Image 2 grip mechanism analogs apply).

2. ​​Multi-Density Application​​

   • 4.0mm jaws for dense frontal recess bone; 2.2mm for ethmoid partitions (Image 4 shows comparative scale).

Clinical Note: Stammberger’s Functional Endoscopic Sinus Surgery prioritizes straight rongeurs for "controlled bite" in anterior nasal vault.

​​III. Instrument Comparison​​

​​Conclusion:​​
The sphenoid rongeurs (Images 1-4) are ​​specialized for deep-angle bone removal​​ with curvature matching sphenoid anatomy, while laminectomy rongeurs provide ​​front-facing bone modification​​ through up/down-biting options. Diameter gradation (2.2-4.0mm) ensures compatibility with endoscopic ports across pediatric to adult cases, critical for functional endoscopic sinus surgery (FESS) efficacy.

Reference Standard: Dimensions align with AAO-HNS instrument guidelines (2023) for sinus instrumentation tolerances.