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At a glance
- Approved by the U.S. Food and Drug Administration in 2012 for people with GERD confirmed by pH testing.
- Placed with minimally invasive surgery; any hiatal hernia is typically repaired at the same time.
- Designed to preserve the ability to belch and vomit.
- Not suitable for people with allergies to titanium, stainless steel, nickel, or ferrous materials, and it places limits on MRI.
How LINX works
The device is a band of small titanium beads, each with a magnetic core, linked by independent wires. It is sized to the patient and placed around the esophagus just above the stomach. At rest, the magnetic attraction between beads adds strength to a weak valve. When you swallow, the pressure of food or liquid pulls the beads apart and the ring expands; afterward, the magnets draw it closed again.
Because the ring can expand, LINX is designed to allow belching and vomiting, which some people find harder after a complete fundoplication.
Who may be a candidate
LINX is intended for people with GERD confirmed by pH testing. The ACG guideline recommends considering magnetic sphincter augmentation as an alternative to laparoscopic fundoplication for patients with regurgitation that doesn’t respond to medical treatment, and the AGA lists it among effective anti-reflux procedures.
Candidacy also depends on:
- Adequate esophageal squeezing on manometry
- Hiatal hernia size and anatomy — hernias are generally repaired at the same operation, and larger or complex hernias are assessed individually
- No allergy to titanium, stainless steel, nickel, or ferrous materials
- Expected future imaging needs — see MRI below
What the evidence shows
In the study that led to FDA approval, most participants reported substantially improved reflux-related quality of life at one year, and most were able to stop daily PPIs. Longer-term follow-up studies have reported that these benefits are generally sustained for many patients over several years.
Limitations are important too. Difficulty swallowing is common in the first weeks and months, and some people need an endoscopic dilation. A small proportion of devices are removed — for persistent swallowing trouble, pain, or recurrent reflux. Erosion of the device into the esophagus is rare but serious; a worldwide review of the experience with the device found it to be uncommon, and it is usually managed with removal.
MRI and LINX
LINX is MRI-conditional: an MRI can be performed only within limits that depend on the specific model implanted, and certain scanners are not compatible. If you expect to need MRI scans in the future — for example, for a neurological or joint condition — this is worth discussing before choosing LINX. After placement, keep your device information and always tell imaging staff you have it.
LINX and fundoplication compared
Both are effective anti-reflux operations performed through small incisions. Fundoplication has the longer track record and suits a wider range of anatomy and esophageal function. LINX is designed to preserve belching and vomiting and doesn’t alter the stomach, but it involves an implanted device with MRI considerations. The treatment comparison shows these side by side.
LINX is among the newer technologies listed as a special interest in Dr. Speer’s professional profile.
Common questions
Who is a candidate for LINX?
Generally, people with GERD confirmed by pH testing, adequate esophageal squeezing on manometry, and no allergy to titanium, stainless steel, nickel, or ferrous materials — particularly those whose regurgitation persists despite medication.
Other factors are weighed individually, including the size and type of any hiatal hernia (usually repaired at the same operation), prior esophageal or stomach surgery, body weight, and whether you expect to need MRI scans in the future.
LINX tends not to be the right fit when the esophagus squeezes weakly, when reflux hasn’t been confirmed, or when someone has a known metal allergy. For people with significant obesity, a gastric bypass may address both weight and reflux.
Can I have an MRI with LINX?
Yes, but only within limits that depend on the specific LINX model you have; always tell imaging staff about the device before any MRI.
LINX devices are labeled MRI-conditional, meaning an MRI can be done safely only under specific conditions, including the scanner’s magnetic field strength. The allowed strength depends on the model implanted, and some scanners exceed it. Keep the device information you receive after surgery and share it whenever an MRI is ordered, so the imaging team can confirm it is safe or choose another scan.
If you already know you’ll need regular MRIs — for example, to monitor a neurological condition — discuss that before choosing LINX.
Sources
- U.S. Food and Drug Administration. Premarket approval P100049 — LINX Reflux Management System (approved March 22, 2012), including Summary of Safety and Effectiveness Data.
- Katz PO, et al. ACG Clinical Guideline for the Diagnosis and Management of GERD. Am J Gastroenterol. 2022;117(1):27–56.
- Yadlapati R, et al. AGA Clinical Practice Update on the Personalized Approach to the Evaluation and Management of GERD. Clin Gastroenterol Hepatol. 2022;20(5):984–994.
- Ganz RA, et al. Long-term outcomes of patients receiving a magnetic sphincter augmentation device for gastroesophageal reflux. Clin Gastroenterol Hepatol. 2016;14(5):671–677.
- Alicuben ET, et al. Worldwide experience with erosion of the magnetic sphincter augmentation device. J Gastrointest Surg. 2018;22(8):1442–1447.
This page is general education. It can’t account for your history, test results, or other conditions, so please discuss your situation with your own clinician.