Bayonet Kerrison Rongeur – 4mm 40° Up Bite | 8″ Working Length

Specialized Bayonet Visualization

The Surgiportal Bayonet Kerrison Rongeur is designed specifically for surgeons working in narrow, deep operative fields under magnification. Unlike standard straight rongeurs, the bayonet profile offsets the handles and the surgeon’s hand from the axis of the jaws. This ensures a completely unobstructed line of sight through a surgical microscope or endoscope, which is critical during delicate laminectomies or foraminotomies.

Precision 40° Up-Bite Mechanism

Effective decompression requires an instrument that can reach into the specific anatomical recesses of the spinal canal.

• 40° Up-Bite Angle: The forward-angled jaw allows the surgeon to easily slide the footplate under the lamina or ligamentum flavum, facilitating safe and efficient bone removal while working “up” away from the neural structures.

• 4mm Bite Size: The 4mm width provides the ideal balance for removing substantial bone volume in the lumbar or thoracic spine while maintaining enough precision for targeted decompression.

Optimized 8″ Working Length

With an 8-inch (20cm) working length (measured from the shroud to the tip), this Kerrison is built for reach. It is perfectly suited for patients with deeper anatomy or for procedures where the surgical corridor is extended by the use of tubular retractors. Despite its length, the instrument maintains exceptional tactile feedback and mechanical leverage.

Premium OR-Grade Construction

Forged from high-carbon surgical-grade stainless steel, the Surgiportal Kerrison is built for professional longevity. The cutting edges are precision-milled to remain sharp through hundreds of cases, ensuring a clean “punch” rather than crushing the bone. Fully autoclavable and reusable, the internal spring mechanism is engineered for a smooth, fatigue-reducing action that returns the jaws to the open position instantly after every bite.

Features & Benefits

• Bayonet Offset Handle: Keeps the surgeon’s hand out of the visual field for microscopy.

• 40° Up-Bite Jaw: Optimized for safe and effective spinal decompression.

• 8″ (20cm) Working Length: Provides the necessary reach for deep spinal and cranial corridors.

• 4mm Bite Width: The standard size for versatile bone removal in major spinal procedures.

• Smooth Ejector Mechanism: Prevents bone fragments from clogging the jaws for uninterrupted use.

• High-Tension Spring: Reduces hand fatigue during long, repetitive decompression cases.

• Fully Autoclavable: Maintains sharp edges and mechanical fluidness through repeated sterilization.

Technical Specifications

FAQs

1. Is the bayonet pattern better than the straight pattern?

The bayonet pattern is preferred when working through a microscope or tubular retractors. By offsetting the handle, it prevents your hand from blocking the light source and the camera/microscope view, which is a common issue with straight Kerrisons.

2. How do I maintain the sharpness of the bite?

Always ensure the rongeur is used only on bone and soft tissue. Avoid contact with metal plates, screws, or pins. We recommend regular inspection of the footplate for any signs of stress and using a specialized cleaning brush to remove all bone debris from the slide before autoclaving.

3. Does this Kerrison feature a thin footplate?

This model features a standard-profile footplate optimized for durability and 4mm bites. If you require an ultra-thin footplate for cervical applications, please check the Surgiportal Micro-Kerrison line.