Dural Graft in Endoscopic and Minimally Invasive Approaches

In endoscopic and minimally invasive approaches, the dural graft must be trimmed precisely and positioned through a narrow corridor where suturing is difficult. Many surgeons therefore rely on onlay or multilayer techniques combined with adjuncts. Suppliers can help by offering technique-matched membranes, the right small sizes and practical support for the scrub team.

Minimally invasive techniques have spread across cranial and spinal neurosurgery, from endoscopic skull base surgery to tubular spine decompression. This article looks at what these approaches mean for dural repair materials, using DESU’s DURASHEET and DECOLL as examples. Clinical technique remains the surgeon’s decision and must follow the instructions for use.

Which approaches are involved?

The term covers several quite different procedures, each with its own repair challenges:

• Endoscopic endonasal skull base surgery, where the dural defect is reached through the nasal corridor and reconstruction is typically multilayer.
• Keyhole and minimally invasive cranial approaches, with smaller openings than a conventional craniotomy.
• Tubular and minimally invasive spine decompression, performed through a retractor of limited diameter.
• Full-endoscopic spine procedures, where the working channel is narrower still.

What these procedures share is limited access. Whether the corridor is a nostril, a small cranial opening or a tubular retractor, the surgeon works at a distance from the dura with restricted angles. That changes how a graft is chosen, prepared and placed.

In skull base surgery, the dural graft is usually one layer among several, often combined with vascularized tissue and other materials. Our article on skull base dural repair covers that layered approach. In minimally invasive spine surgery, the main concern is the incidental durotomy that occurs inside a small working space.

Why is dural repair harder through a small corridor?

Conventional dural suturing depends on angles and space: room to pass a needle, tie a knot and adjust tension. Through a tube or an endoscopic corridor, those angles are restricted. Instruments are long, movements are amplified and the view may be two-dimensional with some endoscopes. Even experienced surgeons find primary suturing slow and technically demanding in this setting.

Positioning is also less forgiving. In open surgery, a graft that shifts slightly can be adjusted by hand with good visibility. Through a corridor, each adjustment takes time and may disturb the other layers of the repair, so the graft needs to be placed correctly the first time as far as possible.

CSF egress adds to the difficulty. Once the dura is breached, fluid can obscure the field and make positioning a graft harder. Surgeons often plan their response to a durotomy in advance precisely because improvising in a narrow corridor is so difficult.

As a result, many surgeons working through minimally invasive approaches favor techniques that do not rely solely on suturing: onlay grafts, multilayer reconstructions and adjuncts such as sealants, according to their own judgment and experience.

What do surgeons need from a graft in a narrow field?

Conversations with minimally invasive and endoscopic surgeons tend to focus on practical handling:

• Trimming to small, precise shapes on the back table without fraying the edges.
• Predictable behavior when wet, so the graft can be passed through the corridor and placed with long instruments.
• Conformability to the surface, so it lies flat against the dura or the defect.
• No need to verify orientation under a limited view.
• Compatibility with the other layers and adjuncts the surgeon uses.

These priorities differ from those of open surgery, where suture retention and coverage of larger areas may matter more. A distributor who understands the difference can have a much more useful conversation.

Back-table preparation deserves special attention. In minimally invasive work, the scrub nurse or technologist often trims the graft to a shape and size the surgeon describes verbally, sometimes several times in a case. Clear communication about the defect, and a graft that trims cleanly, saves time at a moment when the surgeon is managing CSF in a narrow field.

How do DESU membranes fit these techniques?

DECOLL is designed for onlay use, which aligns with the techniques many minimally invasive surgeons prefer. It is supplied in four sizes and is ready to use, which simplifies preparation when the team needs to respond quickly to an unexpected durotomy.

DURASHEET is usable on both surfaces and suturable. In a narrow corridor, the fact that either surface can face the dura removes one check that can be awkward under a limited view. Where the surgeon is able to place sutures, DURASHEET also allows a sutured repair. Like DECOLL, it comes in four sizes and is gamma sterilized.

Whether a particular approach is appropriate for either product is defined by the instructions for use and the surgeon’s judgment. A distributor should not suggest uses beyond what the documentation describes, and should bring approach-specific questions to DESU.

Some departments stock both products for minimally invasive work: DECOLL for the routine onlay response to a durotomy, and DURASHEET for cases where the surgeon expects to place sutures or wants the flexibility of a two-sided membrane. Because each product has only four sizes, carrying both in the smaller sizes keeps the shelf manageable.

What about incidental durotomy in minimally invasive spine surgery?

Incidental durotomy during tubular or endoscopic spine decompression is a recognized event, and many surgeons have a standard response that combines whatever primary closure is feasible with an onlay graft and an adjunct. Because these procedures are frequently performed in ambulatory surgery centers and dedicated spine rooms, the graft must be available wherever the work happens.

For distributors, this means positioning small sizes in minimally invasive spine rooms and outpatient centers, adding the graft to surgeons’ preference cards as an “available if needed” item and making sure circulating staff know where it is. The graft is rarely used in any single week, but when it is needed, there is no time to look for it.

How can a distributor support these teams?

• Learn the instruments and working channels the team uses, so size and trimming discussions are concrete.
• Agree a size mix weighted toward the smaller sizes for minimally invasive spine work.
• Offer a short in-service for scrub staff on preparing and trimming the graft according to the instructions for use.
• Confirm that stock is located in the rooms where minimally invasive cases are performed, including outpatient centers.
• Collect handling feedback after cases and pass it to DESU.

These steps are modest, but they address exactly the problems minimally invasive teams face. A distributor who handles them well is remembered when the department reviews its graft choices.

What should not be claimed?

Minimally invasive surgery attracts enthusiastic marketing, and dural repair materials are sometimes promoted as solving the closure problem in narrow corridors. No graft does that. Repair outcomes depend on the defect, the patient, the surgeon’s technique, the other layers of the repair and the postoperative course.

Avoid describing any DESU membrane as designed specifically for endoscopic or tubular surgery unless the instructions for use say so, and avoid statements about leak rates. Describe the documented features, such as onlay use, two usable surfaces, four sizes and ready-to-use format, and let the surgeon judge how they fit the approach.

Talk to a DESU product specialist

If you support endoscopic or minimally invasive neurosurgery and spine teams and want to discuss DURASHEET and DECOLL for their workflows, DESU’s product specialists can help with documentation, sizes and in-service material. Write to sales@desu.tr or use the contact page.