Glen Oomen Illustration
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Medical & Scientific Illustration

Books, Dental, pathology, surgery
Transventricular Access

Transventricular Access

This neurosurgical image describes the burr hole placement and an endoscopic approach angle for accessing 3rd ventricle tumors and lesions. In this image, there is pineal tumor on the supero-posterior wall of the 3rd ventricle, but the approach also enables access to mammillary bodies.

Optic Nerve Sonography

Optic Nerve Sonography

Illustration demonstrating the visualization of the optic nerve sheath as a means of assessing intracranial pressure. In this procedure a slight dilation of the optic nerve sheath, an extension of the dura mater, is visualized and used as a fast, non-invasive means of assessing how much sub-dural or intracranial pressure is present.

Microneedle Arrays: Sensing and Delivery

Microneedle Arrays: Sensing and Delivery

Illustration describing how arrays of microneedles can be used for bio-sensing and drug delivery. The needles themselves can be vary in shape to serve as anchors within the skin, preventing removal, or be configured to slowly dissolve, releasing a drug as they do or physically releasing from the tissue after a prescribed period of time.

Tube Retractors in Neurosurgery

Tube Retractors in Neurosurgery

This is one image from a larger series describing a technique for using tube retractors and guidance systems to access deep brain lesions. This image shows one of the final steps in the sequence, placing a larger diameter tube.

Superior Hypophyseal Artery Complex

Superior Hypophyseal Artery Complex

Neurosurgical journal illustration showing endoscopic view of the Superior Hypophyseal Artery (SHA) complex in relation to other critical features and landmarks during transphenoidal access.

Ankle Sprain

Ankle Sprain

Illustration showing a classic ankle sprain and related ligaments.

General Sternum Anatomy

General Sternum Anatomy

Orthopedic journal illustration describing the general anatomy of the sternum and vascular considerations around midline sternotomy.

Midline fascia repair post sternotomy

Midline fascia repair post sternotomy

Illustration showing suturing of linea alba tendonous abdominal fascia, post midline sternotomy.

Sternal fixation: clamps

Sternal fixation: clamps

Existing clamp devices for fixing sterni post midline sternotomy.

Pressure testing neobladder

Pressure testing neobladder

Final image in sequence for urology journal article describing a technique for creating a neobladder from distal jejunum, showing the pressure testing of the final, constructed bladder.

Pulmonary Fibrosis

Pulmonary Fibrosis

Journal of Biological Chemistry cover showing pulmonary fibrosis.

46 Day Embryo

46 Day Embryo

Illustration showing a 46 day old human embryo and associated structures .

Doxirubicin Cardiotoxicity

Doxirubicin Cardiotoxicity

Journal of Biological Chemistry cover for study describing a gene deficiency that predisposed cancer patients to irreparable cardiac cell death when treated with doxirubicin. The authors, cardiac surgeons, advocated for genetic testing prior to chemotherapy to ensure the safe use of of the chemotherapuetic

Cerebroprotective technique

Cerebroprotective technique

This illustration is one of a series describing a technique for cerebral protection while repairing ascending aortic aneurysm with dacron graft. The series specifically shows the placement of extracorporeal line placement to maximize blood flow to the head and brain. 

Mitral valve prolapse repair

Mitral valve prolapse repair

This series of illustrations compares two different techniques for addressing mitral valve prolapse. In the top series, the prolapsing leaflet is resected. In the lower series artificial chordae are sutured in place, leaving a larger diameter final valve.

Bicuspid Aortic Valve

Bicuspid Aortic Valve

Illustration series done for New England Journal of Medicine article. This series relates different morphologies of Bicuspid Aortic Valve to the shear forces inflicted upon the aortic wall by their corresponding ejection fractions.

Ross Procedure: three variations

Ross Procedure: three variations

Surgical journal illustration showing three variations in aortic root replacement and repair.

Piggyback OPCABG

Piggyback OPCABG

One illustration from a large series describing different techniques for grafting small diameter vessels for coronary artery bypass. This image shows a piggyback graft and a Heartstring device being used.

Posterior Cutaneous Nerve

Posterior Cutaneous Nerve

Illustration showing the course of the posterior cutaneous nerve of the forearm and how it relates to lateral epicondylitis.

SGLT2 Inhibitor Myocardial effects

SGLT2 Inhibitor Myocardial effects

Sodium Glucose cotransporters are responsible for the resorption of sodium and glucose in the kidneys. SGLT2 Inhibitors thus decrease the resorption of both solutes, decreasing both blood glucose and sodium as they two are excreted. This allows the myocardium to recover both structurally and metabolically.

SGLT2 Inhibitors - renal effects

SGLT2 Inhibitors - renal effects

Sodium Glucose cotransporters are responsible for the resorption of sodium and glucose in the kidneys. SGLT2 Inhibitors thus decrease the resorption of both solutes, decreasing both blood glucose and sodium as they two are excreted. This also changes the hemodynamics and vascular effects within the glomerulus.

Biceps Tendon

Biceps Tendon

This image shows a pulley rupture of the ligaments supporting the biceps tendon as it ascends out of the bicepital groove.

LDL vs HDL

LDL vs HDL

Illustration comparing low density lipoproteins vs high density lipoproteins.

Intraoral Anatomy

Intraoral Anatomy

Illustration showing normal intraoral anatomy.

Excalibur Book Cover

Excalibur Book Cover

This book cover was done for 96 year old retired general surgeon and inaugural chair of surgery at McMaster University C. Barber Mueller. Writing the book was one of the last things he really wanted to do, it was kind of his opus. I illustrated the whole book. It's kind of a history of the big ideas in science and how they're all linked. I spent most thursday afternoons with 'Barb' as I worked on the illustration roughs and he would tell me stories about the first kidney transplants, the first dialysis machines, being present when the Berlin wall fell, what it was like to see a CT or MRI for the first time, or when he was awarded the Bronze Star when he was a Marine Corpsman. He was one very fascinating and friendly man. It was such a fun and lovely project to work on. I didn't charge a cent for it.