Transcript Intracardiac Tool Generation

Intravascular Foreign
Body Retrieval System
Nathan Luibrand, Nicholas Luibrand,
Lukas Richards, and
Elise Adcock-Hinojosa
Advised by Dr. Michael Barnett
Problem Statement
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There is only one tool commonly used today,
the En Snare.
Very limited maneuverability.
Background
Over 70,000 foreign body retrieval procedures are performed per
year.
 Items retrieved from the vascular system include wire and
catheter fragments and stents.
The En Snare Device
 A system of 3 interlocked loops of wire which when pulled into
the catheter cause the loops to close and catch the targeted
foreign body.
 Using a wire snare, like the En Snare, is only successful when
there is a free floating end to the foreign body
 Some foreign bodies are caught at awkward angles and require a
better orientation in order to be pulled inside the catheter to
reduce damage to the vessels during retrieval.
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Advantages
There are some advantages to using a forcep-like device
over using wire snares for foreign object retrieval:
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Greater maneuverability (rotational and “grasping”
area)
The ability to dislodge a foreign body trapped with no
free end: the ability to grab the foreign body in the
middle of the object
Less damage to the endothelium or vascular wall when
removing sharp dislodged objects
How can this tool be used?
The En Snare, as well as any future devices foreign body
removal devices can be used in:
 Indwelling Venous Catheter Repositioning
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An indwelling venous catheter allows for venous access for
long periods of time (months to years), and it is more easily
repositioned with a retrieval device.
Snare Assisted Guide Wire Capture
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When introducing a wire into the body, the use of a snare
entered through a different incision can aid in guiding the
wire where it needs to go (i.e. capturing a wire over the aortic
bifurcation).
http://www.saintfrancis.com/hearthospital/services/heartsurgery.aspx
How can this tool be used?

Foreign Body Removal
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Stents, wires, thrombi, etc.
http://www.mayoclinic.org/cardiothoracicsurgery-jax/diseases.html
Primary Objective
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The current tool being used for foreign body retrieval has limited
maneuverability
To design a device which can not only “grab” foreign bodies, but
which can also manipulate them in such a way as for easier
removal.
Performance Criteria
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This tool will be used to perform intravascular retrieval
from peripheral arterial or venous access sites.
Its size could range from 1-8 mm in diameter and 160190 cm long.
The goal is to be able to use the tool to reorient and
remove debris –both natural and synthetic- from
vasculature of small to large radii through a catheter.
Current techniques do not allow for effective
reorientation and subsequent alignment with a catheter
for retrieval.
Work Completed
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Met with Michael Barnett about project
specifics, discussing most common current
methods.
Established project goals and timeline (proposal)
Establish project specifics pertaining to
constraints for tool
Created basic concept drawings, and performed
literature searches to compare with existing
designs.
Current Work
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Researching information on En Snare, mainly
looking for ways to improve the design.
Brainstorming and drawing rough sketches of
different ways to allow reorientation of foreign
bodies and threading them into the device.
Meet with Dr. Barnett and to watch related
surgery.
Catheter Lab
Future Work
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Determine what budget is necessary by discussing with advisor
Determination of the best design sketched
Designing the best determined model using an autoCAD tool.
In a week or two, our goal is to have one or more feasible
foreign body retrieval tools completely designed.
We consider success in the overall academic year to be the
completion of an acceptable prototype. We wish to be at a stage
where the prototype appears promising enough for someone else
to be willing to take the design to completion should we choose
to conclude our work at graduation.