Merit Medical ONE Snare Endovascular Snare System - Manual (Page 3)

DESCRIPTION: English
The ONE Snare™ endovascular snare system consists of the snare, snare catheter, insertion tool and
torque. The snare is constructed of nitinol cable and gold plated tungsten loop. The pre-formed
snare loop can be introduced through catheters without risk of snare deformation because of the
snare’s super-elastic construction. The snare catheter is constructed of polyether block amide and
contains a platinum/iridium radiopaque marker band.
INDICATION FOR USE:
The ONE Snare™ endovascular snare system is intended for use in the coronary and peripheral vascular
system or hollow viscous to retrieve and manipulate foreign objects. Retrieval and manipulation
procedures include indwelling venous catheter repositioning, indwelling venous catheter fibrin sheath
stripping, and central venous access venipuncture procedure assistance.
CONTRAINDICATIONS:
1. This device is not intended for the removal of foreign objects entrapped by tissue growth.
2. This device should not be used for fibrin sheath stripping in the presence of septal defects
of Persistent Foramen Ovale.
3. This device is not intended for removal of implanted pacing leads.
WARNINGS:
1. Pull forces applied to catheters during fibrin sheath stripping may damage, stretch, or break
indwelling catheters 6 French or smaller in diameter. Do not use excessive pull force when
attempting fibrin sheath stripping of catheters 6 French or smaller in diameter.
2. Do not use excessive force when manipulating the catheter through an introducer.
Excessive force may damage the snare catheter.
3. This device has been sterilized utilizing ethylene oxide and is considered sterile if the
package is not opened or damaged. Do not use a device that has been damaged or if the
package is open or damaged.
4. For single patient use only. Do not reuse, reprocess or sterilize. Reuse, reprocessing or
resterilization may compromise the structural integrity of the device and/or lead to device
failure which, in turn, may result in patient injury, illness or death. Reuse, reprocessing,
or resterilization may also create a risk of contamination of the device and/or cause
patient infection or cross-infection including, but not limited to, the transmission of
infectious disease(s) from one patient to another. Contamination of the device may lead
to injury, illness or death of the patient.
5. After use this device may be a potential biohazard. Handle in a manner that will
prevent accidental contamination.
6. Nitinol is a nickel titanium alloy. Possible reaction may occur for those patients who
exhibit sensitivity to nickel.
7. Care should be observed when using this device for removal of a large fibrin sheath in order to
minimize risk of pulmonary embolism.
PX only: CAUTION - Federal (U.S.A.) law restricts this device to sale by or on the order of a physician.
POTENTIAL COMPLICATIONS:
1. Potential complications associated with foreign body retrieval devices in arterial
vasculature include, but are not limited to:
• Embolization
• Stroke
• Myocardial infarction (depending upon placement)
2. Potential complications associated with snare retrieval devices in venous vasculature
include, but are not limited to:
• Pulmonary embolism
3. Other potential complications associated with foreign body retrieval devices include,
but are not limited to:
• Vessel perforation
• Device entrapment
Catheter damage can occur when attempting fibrin sheath stripping on small French size diam-
eter catheters. (See WARNINGS)
Incidence of pulmonary embolism after fibrin sheath stripping may occur.
(See WARNINGS)
DIRECTIONS FOR USE:
Prepare the ONE Snare™ System:
Select the appropriate snare diameter range for the site in which the foreign body is located. The snare
diameter range should approximate the size of the vessel in which it will be used.
1. Remove the snare and snare catheter from their hoop holders and inspect for any damage.
2. Remove the insertion tool and torque device from the proximal end of the snare shaft.
3. Load the snare into the snare catheter by inserting the proximal end of the snare into the distal
(non-hubbed) end of the snare catheter, until the proximal end of the snare shaft exits the hub and
the loop can be retracted into the distal end of the snare catheter.
4. Inspect the device by extending and retracting the snare loop through the distal end of the snare
catheter 2-3 times, while carefully examining the snare catheter, radiopaque band and the device
for any damage or defects.
5. When appropriate, the system (snare and snare catheter) can be advanced to the desired site as a
single unit assembled as described above.
Alternative Preparation of the ONE Snare™ System:
If the snare catheter is already positioned within the vasculature, the provided insertion tool (located
on the proximal end of the snare and just distal to the torque device) may be used to position the snare
in the indwelling snare catheter.
1. Remove the snare from the protective holder and inspect for any damage.
2. Move the provided insertion tool (located on the proximal end of the snare, just distal to the torque
device) distally until the loop of the snare is enclosed within the tubing portion of the insertion tool.
3. Insert the distal end of the insertion tool into the hub of the indwelling snare catheter until
resistance is felt. This will indicate the tip of the insertion tool is properly aligned with the inner
lumen.
4. Hold the insertion tool as straight as possible, grasp the shaft of the snare just proximal to the hub
of the insertion tool and advance the snare until it is secure within the lumen of the snare catheter.
The insertion tool can be removed by grasping the blue tab and firmly peeling it away from the
snare shaft.
Snare Assisted Retrieval and Manipulation Suggestions:
1. If present, remove the indwelling delivery catheter.
2. If a guidewire is in a patient at the location of a foreign body, advance a snare catheter over the
guidewire to the desired location. Then remove the guidewire and advance the snare through the
snare catheter. Alternatively, cinch one loop of the snare over the proximal end of the guidewire and
advance the entire system (snare and snare catheter assembly) into a guide catheter or introducer
sheath until the distal end of the snare catheter is positioned proximal to the foreign body.
3. If a guidewire is not present, pull the snare into the distal end of the snare catheter and advance
through a guide catheter or introducer sheath until it is positioned proximal to the foreign body.
Alternatively, collapse the snare loop by pulling the device into the distal end of the snare insertion
tool. Place the tapered end of the snare insertion tool into the proximal (hub) end of the snare
catheter, guide catheter or sheath and advance the snare forward maintaining constant contact
between the insertion tool and snare catheter hub. NOTE: When attempting to utilize guide
catheters or sheaths not specifically manufactured for use with the ONE Snare™ system, it is
important to test product compatibility prior to use.
4. Gently push the snare shaft forward to completely open the loop. The loop is then slowly advanced
forward, and around the proximal end of the foreign body. Alternatively, the snare may be advanced
beyond the target location and the loops brought back around the distal end of the foreign body.
5. By advancing the snare catheter, the loop of the snare is closed to capture the foreign body. Note
that attempting to close the loop by pulling the snare into the snare catheter will move the loop
from its position around the foreign body.
6. To manipulate a foreign body, maintain tension on the snare catheter to retain the hold on the
foreign body, and move the snare and snare catheter together to manipulate a foreign body to the
desired position.
7. To retrieve a foreign body, maintain tension on the snare catheter and move the snare and snare
catheter assembly together proximally to or into a guide catheter or sheath. The foreign body is
then withdrawn through or together with the guiding catheter or introducer sheath. Withdrawal of
large foreign bodies may require the insertion of larger sheaths, guiding catheters, or a cut-down at
the peripheral site.
Snare Assisted Removal of Fibrin Sheaths from Indwelling Catheters:
1. Using standard technique, prepare a femoral vein approach, advance the selected snare to the
inferior vena cava or right atrium.
2. Advance a .035” (0.89 mm) guidewire through the end port (distal or venous port if more than one
lumen) of the indwelling catheter and into the inferior vena cava or right atrium.
3. Position the snare loop around the guidewire.
4. Advance the snare over the distal end of the catheter to a position proximal to the fibrin sheath.
5. Close the snare around the catheter and continue applying light traction while gently pulling the
snare down toward the distal end of the catheter over the end ports.
6. Repeat steps 4 & 5 until the catheter is free of fibrin sheath.
Snare Assisted Venous Canalization:
1. Introduce the snare at a patent venous access site and position in the vasculature at the desired site.
2. Open the snare loop to provide a target to guide an entry needle into the desired venous access site.
3. Introduce a guidewire through the needle and through the snare loop. Remove the needle.
4. Close the snare over the guidewire by advancing the snare catheter.
5. Pull the guidewire into the inferior vena cava.
ONE Snare™ System contains:
(1) Snare, (1) Snare Catheter, (1) Insertion Tool and (1) Torque Device.
Merit Medical Systems, Inc.
1600 West Merit Parkway, South Jordan, Utah 84095 U.S.A. 1-801-253-1600
U.S.A. Customer Service 1-800-356-3748
Merit Medical Ireland Ltd, Parkmore Business Park West, Galway, Ireland
www.merit.com
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