mechanical thrombectomy devices
TRANSCRIPT
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Mechanical Thrombectomy Devices
Thomas M. Vesely, MDVascular Access Services, LLC
Saint Louis, Missouri
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No conflicts of interest
relevant to thrombolysis / mechanical thrombectomy
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Number and Type of
Hemodialysis Thrombectomy Procedures by Year
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Use of a 7 Fr. guiding catheter
to aspirate thrombus
guiding catheters have non-tapered tips
for better aspiration of thrombus
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7 Fr.introducer
sheath
thrombus
tip ofguiding catheter
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Post-aspiration thrombectomy
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Thrombus aspirated from hemodialysis graft
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Thrombectomy Methods
Aspiration
Balloon Maceration
Mechanical Devices
Thrombolytics
Popularity Cost Speed Effectiveness
++++ + ++ ++
+++ ++ +++ +++
+ ++++ ++++ ++++
+ ++++ + ++
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“Vascular access patency is determined by
the identification and successful treatment
of all significant stenoses,
and not the method of thrombus removal.”
Thomas Vesely, MD
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Are mechanical thrombectomy devices cost effective?
No clinical studies to answer this question
Nope
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“Spinning Wires”
Percutaneous Thrombolytic Device (PTD)
Cleaner XT (Prolumen)
Solera
XTD
“Spinning Brushes”
Castenada Brush
Cragg Brush
“Acoustic Energy”
EkoSonic (Omnisonics)
“Supersonic Spinners”
Helix (ATD)
Thrombex
Aspirex SExciser
ThrombCat
“Hydrodynamic”
AngioJet
Hydrolyser
Oasis
“Suction”EndoVac
Mechanical Thrombectomy Devices
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PTD Thrombectomy Device
inserted through 6 Fr sheath
wire basket fragmentsand macerates thrombus
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Mechanical Injury to VeinComparison of the PTD to Embolectomy Balloon
Lajvardi A et al. Cardiovasc Intervent Radiol 1995; 18: 172 - 178
Percentage of
Endothelial
Denudation
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Cleaner XT
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inner rotatingmacerator
outer stationary basket
hand-heldmotor drive
- Similar to PTD but only theinner basket spins (at 3000rpm)
- Outer basket can be manuallyrotated
aspirationport
Solera
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XTD (“Extract Device”)
Battery powered motor
spins a curved guidewire tip
at 10,000-15,000 rpm
Aspiration using
attached syringe
curved tip spins @ 10,000rpm
aspiration using20cc syringe
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After maceration of the thrombus
use a 20cc syringe to aspirate the thrombus
via the sidearm of the vascular sheath
20cc syringe Aspirated thrombotic debris
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Needle damage to stent graft
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Stent graft wrapped around on PTD basket
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PTD entangled
in fractured metal stent
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Unraveled fractures stent from PTD thrombectomy device
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Mechanical Thrombectomy Devices
“Supersonic Spinners”
Helix
Thrombex
Aspirex S
ThrombCat
Exciser
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Helix (ATD)
Super high speed (>100,000 rpm)
pressurized (30 psi) air-driven impeller
within catheter tip housing
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After maceration of the thrombus
use a 20cc syringe to aspirate the thrombus
via the sidearm of the vascular sheath
20cc syringe Aspirated thrombotic debris
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AngioJet Solent Omni
Solent Proxi
AVX
Multiple high pressure saline jets
create vacuum at catheter tip
To aspirate and remove thrombus
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Hydrodynamic Thrombectomy Devices
Fluid turbulence shears thrombus into fragments
Some devices will aspirate thrombus fragments
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Oasis and Hydrolyzer devices had similar systems
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Intraprocedural Blood Loss
• Hemodialysis patients have lowhematocrits (25 - 35%)
• Aspiration devices can remove largevolumes of blood quickly
Hemolysis
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Maintain awareness of the procedure :• Is progress being made?
• Patient fatigue
• Radiation exposure
• Blood loss
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803 percutaneous thrombectomy procedures were performed
on PTFE hemodialysis grafts between 1/1/93 and 9/1/00.
This included the following types and numbers of procedures:
Pulse-spray UK (240) Endovac (7)
Arrow-PTD (412) Lyse & Wait (7)
ATD (79) Thrombex (6)
AngioJet (17) Cragg brush (6)
Oasis (15) Castaneda brush (4)
Hydrolyser (10)
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12 minor complications requiring minimal treatment
18 major complications that altered the course of theprocedure or treatment of the patient
One death resulting from a fall from the angiography tableimmediately following the procedure
Ten (10) of these major complications were due toangioplasty-induced rupture of a vein
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Complications were reported to have occurred in 30 patients
The complication rate was = 3.7%
The type and number of complications included:
Rupture of a vein during angioplasty (13)
Severe respiratory distress (4)
Arterial emboli (3)
Rigors related to urokinase (3)
Access site bleeding (2)
Moderate hypoxia (2)
Other complications (3)
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Complication Rates
Complication Other Reports Vesely
Major bleeding 0.7 – 1.7 % 0
Minor bleeding 2.8 – 11.1 % 0.25 %
Venous rupture/dissection 1.2 – 7.0 % 1.6 %
Arterial emboli 1.2 – 9.3 % 0.37 %
Acute respiratory arrest 1.6 – 2.3 % 0.50 %
Contrast reaction 0.7 – 1.4 % 0
Sepsis; infection 1.2 – 2.0 % 0
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Conclusions
Many different types of mechanical thrombectomy device
- READ instructions for use document
Long-term patency of access in not related tothrombectomy method
Mechanical thrombectomy devices are not cost effectivebut improve speed to thrombus removal
Be mindful of blood loss and hemolysis
Mechanical thrombectomy procedures have complication ratessimilar to other percutaneous thrombectomy methods
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