Description

The Avanos MIC-KEY Low-Profile Gastric-Jejunal (GJ) Feeding Tube, ENFit, is a skin-level device placed through an established gastrostomy stoma with the distal limb in the jejunum. It enables simultaneous jejunal feeding and gastric decompression/venting for pediatric and adult patients who require post-pyloric feeding while maintaining gastric access.

Design and retention

• Low-profile “button” with external bolster and an internal inflatable retention balloon.
• Two lumens with separate external access ports: JEJUNAL (feeding) and GASTRIC (decompression/venting), plus BAL port for balloon inflation/deflation.
• One-way/anti-reflux valves in G and J ports that open when a MIC-KEY extension set is attached.
• Weighted (tungsten) jejunal segment to help maintain jejunal placement; multiple jejunal exit ports for distribution.
• Radiopaque stripe for imaging and a tapered distal tip to aid placement.

Connectivity and extensions

• ENFit connector interface; uses MIC-KEY GJ Extension Sets (bolus and continuous). The same keyed interface is used on G and J ports.
• Lock-and-key connection: align black orientation lines on the extension and button, push in firmly while holding both, then turn clockwise up to about 3/4 turn to lock. Keep locked during feeding; twist to lock/unlock the cap.
• Extensions are not interchangeable across brands; use MIC-KEY brand extensions only. For disconnection, hold the center of the button and pull the extension straight out by the hard connector.

Ports and typical use

• JEJUNAL port: enteral feeding/medications to the small intestine.
• GASTRIC port: decompression/venting via gravity drainage or low intermittent suction; do not use continuous or high-intermittent suction.
• BAL port: inflate/deflate the balloon with sterile or distilled water only.

Sizes and options

• Tube outer diameters: 14, 16, 18, 22 Fr.
• Jejunal limb lengths: 15, 22, 30, 45 cm (availability varies by diameter).
• Stoma tract lengths: approximately 1.0–7.0 cm in defined increments (availability varies).
• Jejunal length is measured from the distal aspect of the retention balloon to the catheter tip.

Balloon inflation guidance

• Typical fill volumes: about 3 mL recommended (max 5 mL) for J lengths up to 30 cm; about 7 mL recommended (max 10 mL) for 45 cm J length. Verify the exact volume for the specific size in the IFU. Do not overinflate.

Materials, sterility, and regulatory

• Medical-grade silicone; not made with natural rubber latex.
• Sterile (gamma sterilized); single-use; prescription device (Rx only). Not for re-use, re-processing, or re-sterilization.

Kit contents (may vary)

• MIC-KEY Low-Profile GJ Tube.
• MIC-KEY GJ Continuous Feed Extension Set (~12 in).
• MIC-KEY GJ Bolus Extension Set (~12 in).
• 35 mL syringe (priming/flushing/venting extensions).
• 6 mL luer-slip syringe (balloon inflation/deflation).
• Gauze pads; introducer cannula/straightener may be included.

Handling and care notes

• Do not rotate GJ tubes; do not rotate the external bolster.
• Flush the tube and extensions before and after every use; use only water-soluble lubricant if needed.
• If the J limb migrates into the stomach or the tube is damaged proximal to the jejunal segment, stop jejunal feeding (and gastric feeding if unsafe) and seek prompt clinical assessment.
• Leakage at the head may relate to internal valves, constipation/slow gastric emptying, or a plugged port/broken locking notch; management can include addressing constipation, slowing feeds, pulsatile flushing, and keeping the cap closed or an extension connected when not in use; seek clinical review if not resolving.
• The external bolster should rest about 1–2 mm above the skin; stoma length is clinician-measured and should be re-checked with changes in patient size/weight.