Suturable Dural Grafts: When the Graft Is Sutured
When a dural graft is sutured to the dura, when it is not, and what suturable means for a collagen membrane. Includes DURASHEET sizes and handling facts.
A dural graft is sutured to the dura when the surgeon wants it fixed in position rather than held by contact alone, usually where the edges of the dura can be reached and will hold a stitch. Among DESU's dural grafts, DURASHEET is the suturable option: a pure Type I bovine collagen membrane with high tensile strength.
Key takeaways
- A graft is usually sutured when the surgeon wants it fixed in place and the dural edges can hold a stitch.
- Suturing is harder where edges are out of reach, fragile or scarred, and an onlay may be preferred there.
- DURASHEET is a suturable collagen membrane with high tensile strength, usable from either surface.
- The choice of closure, suture and technique belongs to the surgeon and the instructions for use.
What does suturable mean for a dural graft?
A suturable graft is one the surgeon can stitch to the dura without the material giving way at the suture line. A needle and thread put a graft under stress at many small points, and the graft has to keep its shape around each one.
The DURASHEET collagen dura membrane has a suturable structure with high tensile strength, and its mechanical structure is designed to suit suturing according to surgical need. A surgeon judges how a graft handles by working with it.
When do surgeons suture a graft to the dura?
No fixed rule covers every case, and practice varies between surgeons and units. In general, suturing tends to be favoured in these situations:
- The dural edges are visible, reachable and strong enough to hold a stitch.
- The graft needs to stay in position, for example where it would not rest securely on the tissue beneath it or where CSF pressure could move it.
- The surgeon wants a close, continuous fit between graft and dura as part of the aim of a watertight closure.
- The defect is in the spine, where CSF pressure is higher when the patient is upright, and a fixed repair may be preferred where the anatomy allows.
- Suturing is the surgeon's routine, and the case gives no reason to change it.
When is a graft not sutured?
The same reasoning works in reverse. Suturing depends on access and on the quality of the tissue, and when either is poor, a stitch may add little or tear the tissue.
- The defect is deep or sits where a needle cannot be used safely, such as parts of the skull base.
- The dura is thin or fragile and may tear at the stitches.
- The dura is scarred, as in some revision cases.
- The approach is narrow, as in many endoscopic or minimally invasive procedures.
- Stitching would leave the repair under tension.
In these situations, surgeons often consider an onlay technique, where the graft overlaps the defect without being stitched in place. Some combine methods, for example with sutures at a few points only, or a sealant over the repair.
How does a sutured repair differ from an onlay?
| Question | Sutured repair | Onlay repair |
|---|---|---|
| How is the graft held? | By stitches at the dural edge | By contact with the surrounding tissue |
| What does it need from the dura? | Reachable edges that hold a stitch | Enough healthy dura around the defect to overlap |
| What does it need from the graft? | Strength at the suture line | Good contact with the tissue |
| What should be watched? | Needle holes and tension | Graft position |
A fuller comparison of the two techniques is in onlay vs sutured duraplasty.
What does a sutured repair ask of the graft?
- Strength. The graft has to hold stitches, which is where DURASHEET's high tensile strength comes in.
- Easy orientation. DURASHEET can be used from either surface, so the team does not need to work out which side faces the defect.
- Readiness. It is supplied ready to use, with no pre-processing before application, and is gamma sterilised.
- Size range. The four sizes in the table below run from 2.5 × 2.5 cm to 10 × 10 cm.
- Absorption. The collagen matrix has a high absorption capacity.
Sutures also make holes. Each stitch goes through both graft and dura, and the holes can be a route for CSF. So sutures alone do not settle whether a closure will hold, and some surgeons add further layers. The limits are discussed in what a graft can and cannot achieve in watertight closure.
Which DESU membrane is used for a sutured repair?
Both DESU dura membranes are pure Type I bovine collagen, biodegradable, ready to use and gamma sterilised, and both have an impermeable pore structure. The difference is suturing: DURASHEET is suitable for it, and DECOLL is an onlay membrane.
| Feature | DURASHEET | DECOLL |
|---|---|---|
| Application method | Onlay, and suitable for suturing | Onlay |
| Tensile strength | High | — |
| Usable surface | Either surface | — |
| Sizes | 2.5 × 2.5, 5 × 5, 7.5 × 7.5, 10 × 10 cm | 2.5 × 2.5, 5 × 5, 7.5 × 7.5, 10 × 10 cm |
| Order codes | DRS2525, DRS5050, DRS7575, DRS100100 | DCL2525, DCL5050, DCL7575, DCL100100 |
DURASHEET's suturability does not make it a suture-only product. It can also be applied as an onlay, at different CSF pressure levels. DECOLL is for onlay use. A department that wants the option to suture should therefore look at DURASHEET.
Which procedures are these membranes used in?
Both membranes are for dural defects after spinal tumour surgery and after trauma, meningocele, myelomeningocele and surgical dural defects associated with lipoma. Whether to suture in any of these depends on the patient, the tissue and the surgeon, and the instructions for use apply in every case.
What should the OR team prepare?
- Confirm which membrane and size the surgeon wants before the case: DRS codes for DURASHEET, DCL codes for DECOLL.
- Ask whether the surgeon plans to suture and which suture they want.
- Ask whether a sealant or additional layers are planned.
- Check the instructions for use for handling steps such as trimming.
Talk to a DESU product specialist
For the instructions for use, sample units or size planning, write to sales@desu.tr, use the contact page or request a quote.
Frequently asked questions
Can DURASHEET be used without sutures?
Yes. DURASHEET can be applied as an onlay at different CSF pressure levels, as well as being suturable. The surgeon chooses the method.
Does the DURASHEET surface facing the brain matter?
No. DURASHEET can be used from either surface, so neither side is designated as the side to place on the defect.
Does DESU recommend a specific suture for its grafts?
No. We leave suture type and size to the surgeon, within the instructions for use.
Do I need to soak DURASHEET before suturing it?
DURASHEET needs no pre-processing before application. Follow the instructions for use for handling during the procedure.
Related standards
- ISO 22442 series: Medical devices utilizing animal tissues and their derivatives
- ISO 11137 series: Sterilization of health care products — Radiation
- ISO 10993 series: Biological evaluation of medical devices