The Venous Window Needle Guide is comprised of a single piece titanium device that allows for repeated access of an autogenic arteriovenous (AV) fistula through a single puncture site or buttonhole for maintenance hemodialysis. The Venous Window Needle Guide is implanted subcutaneously and attached to the exterior fistula wall utilizing a surgical cut-down technique and sutured to secure the implant to the fistula. The device remains in this extra-vascular, subcutaneous position. Once healed, the palpable device is used as a target to guide needle access to the fistula, which is now fixed to the base of the device. A porous, textured vessel interfacing surface promotes ingrowth of tissue resulting in further securement and sealing of the implant to the fistula. There is not an artificial septum. Rather, the implant relies upon the sealing and healing of the fistula wall to achieve hemostasis. The Venous Window Needle Guide facilitates access to deep and difficult to cannulate fistulae. The Needle Guide enables the development and use of the buttonhole cannulation technique.
The Venous Window Needle Guide is a CE marked device and is indicated for use as an access device accessory on arteriovenous fistulas (AVF) for hemodialysis procedures using a constant site or “buttonhole” method of needle insertion.
VWNG Cannulator Reference Sheet, General - Embedded
VWNG Implantation Reference Sheet - Embedded
The Venous Window Needle Guide, a hemodialysis cannulation device for salvage of uncannulatable arteriovenous fistulas