Kurdistan Board GEH: Weekly journal club
Supervisor: Dr.Mohamed Shekhani
Presenter: Dr.Abdulla Delmany.
Magnets are of interest to the endoscopist or surgeon because
they exert a force over a distance and can therefore be used to
control instruments remotely or to create compression forces.
Magnet-assisted enteral tube placement &
electromagnetic tube tracking
The distal end of the tube contains a magnetic field sensor that is
connected to an indicator light at the proximal end of the tube.
A handheld external steering magnet is used to maneuver the
tube through the pyloric sphincter.
The indicator light signals when the external magnet has captured
the magnet on the distal tip.
To verify placement in the duodenum, duodenal fluid is aspirated
and applied to pH paper that comes with the kit.
The presence of alkaline fluid suggests post-pyloric placement,
which should be verified by radiography.
Magnetic endoscopic imaging & magnetic
The ScopeGuide system (Olympus) uses electromagnetic fields to
display colonoscope progress& loop formation, through-the-scope
probe ot tiny wire coils positioned along the length of the
colonoscope or probe.
The magnetic fields from these wire coils induce an electric
current in an external sensor coil,converted into real-time 3dimensional views of the colonoscope shaft conf guration and its
location within the abdomen on a separate computer monitor.
Magnet-assisted stent and foreign body removal:
Magnets can be used in conjunction with endoscopy to aid in
removal of ingested ferromagnetic objects such as batteries.
Removal of endoscopically placed biliary/pancreatic stents by
using an external magnet could obviate the need for a second
A strong external permanent magnet
attracts a biliary or
pancreatic stent equipped with a
magnetic proximal end. B, By use of
appropriate maneuvers, the stent can
be dislodged from its initial position
to pass naturally.
SURGICAL: Linx, Fenix& other devices:
In 2012, FDA -approved for patients with GERD who are
symptomatic despite maximal medical therapy.
A series of titanium beads, each with a magnetic core, connected
with independent titanium wires to form a ring shape.
The magnetic beads are wrapped around the lower esophageal
sphincter by using laparoscopy.
Fenix magnetic anal sphincter.
ESD, Minimal access surgery, natural orifice transluminal
endoscopic surgery (NOTES)& magnetic compression anastomosis
Magnetic nanoparticles in specific target locations, used as a drug
delivery system, especially for cytotoxic drugs, and as heat
mediators for hyperthermia for localized tumor therapy and for a
number of other applications.