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Biomedical Device Laboratory. Dr. Duncan Maitland Associate Professor – Department of Biomedical Engineering Texas A&M University Mary Biediger John Marshall High School Northside Independent School District – San Antonio, Texas. Facts about Stroke. 750,000 cases per year

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biomedical device laboratory

Biomedical Device Laboratory

Dr. Duncan Maitland

Associate Professor – Department of Biomedical Engineering

Texas A&M University

Mary Biediger

John Marshall High School

Northside Independent School District – San Antonio, Texas

facts about stroke
Facts about Stroke
  • 750,000 cases per year
  • 150,000 deaths per year

(3rd leading cause of death)

  • 30,000 hemorrhagic strokes (treatable)
  • Leading cause of disability
  • $40 billion spent on treatment and rehabilitation annually
historical treatment since 1937
Historical Treatment (since 1937)
  • Surgical Clipping – via craniotomy

Still used


if it s working why change it
If it’s working, why change it?
  • Surgery on any one area may cause problems with speech, memory, muscle weakness, balance, vision, coordination, and other functions.
  • Blood clot or bleeding in the brain
  • Seizures
  • Stroke
  • Coma
  • Infection in the brain, in the wound, or in the skull
  • Brain swelling


  • Hospitalization – 5 to 7 days
  • Recovery time before returning to work – 6 to 12 weeks


alternative treatment since 1991
Alternative Treatment (since 1991)

Detachable coil embolization

-Can reach previously inoperable aneurysms

  • Catheter-related risks: Intra-arterial catheterization involves a risk of bleeding, infection and arterial damage.
  • Surgical risks: As with any invasive procedure, there is a slight risk of death or illness.
  • Approximately 7% of cases require additional treatment or surgery.


additional complications
Additional Complications
  • Surgery time (varies with number of coils being implanted)
    • Doctors not happy
    • Patients not happy
      • Customers not happy – product less likely to sell
  • Clots forming in the blood stream
    • Problems downstream
  • Hospitalization – 2 days
  • Recovery time before returning to work – about a week


cutting edge treatment
Cutting Edge Treatment
  • SMP Foam – made to fill aneurysm
cutting edge treatment1
Cutting Edge Treatment
  • Crimped to a cylindrical shape to be fed through a micro-catheter and actuated at the site.
why do it
Why do it?
  • Catheter and Anesthesia
  • Foam is more biocompatible
  • Healing time significantly reduced

*This is one aspect of the work going on in the lab. It is nearly ready for animal trials, not yet used in humans.

another treatment currently in use metal stent
Another treatment (currently in use) - Metal Stent

Reinforce the weak

artery wall

Encourage normal

blood flow

Reopen partially

blocked passages

angioplasty vs stent
Angioplasty vs. Stent


stent use for aneurysm treatment
Stent use for aneurysm treatment
  • In combination with coiling
    • For “wide-neck” aneurysm.


in the lab
In the lab
  • SMP plastic tube
why do this
Why do this?
  • Can you tell me
what i will do
What I will do
  • Use an MRI from a current patient
what i will do1
What I will do
  • Make a model using 3D printer
what i will do2
What I will do
  • Make a negative model
what i will do3
What I will do
  • Create a SMP plastic stent to treat the aneurysm and test it in the model.
  • Focus of the lab:
    • Design devices to treat aneurysms, fistulas, and stroke
    • Improve treatment options from what is currently used in practice
    • Use Shape Memory Polymers to create devices that will be more readily accepted by the human organism
  • TAMU E3 program
  • NSF, NPI, and TWC
  • Dr. Duncan Maitland, PhD.
  • John Horn – Graduate student who is graciously donating his time to teaching me about the work in the lab.
  • All of the graduate students in the biomedical lab who gleefully answer my queries about their various projects.