IVC Filter Retrieval System


Project Id: 2021-40


Inferior vena cava (IVC) filters are small, metal devices temporarily placed in the inferior vena cava that are designed to catch blood clots and stop the blood clots from traveling to the lungs. An average of 65,000 IVC filters are placed annually in the United States. About 15% of the time, the IVC filter becomes embedded in the intima of the vessel, rendering it irretrievable by conventional methods such as the snare method. These filters are needed in patients with a history or risk of deep vein thrombosis (DVT) or pulmonary embolism (PE), as well as trauma victims and immobile patients. Immobile patients may need IVC filters when other methods such as blood-thinning agents are unsuccessful. The snare method is the most popular method of retrieval and relies on the ability to grasp the retrieval hook on the end of the IVC filter. However, when the IVC filter is tilted at an angle, the snare is unable to grab the retrieval hook by itself. Additionally, the surgeon and/or radiologist needs to be able to see the hook clearly on the angiogram, which is a black and white two-dimensional image. These variables make the retrieval process more difficult and can significantly increase retrieval time.

Invention Summary:

Researchers at the University of Toledo have developed a novel IVC filter retrieval device characterized by a hook deployed from an angled pig-tailed catheter which is encompassed by a slightly larger, outer sheath thereby reducing retrieval time over conventional methods. The hook on the retrieval device is designed large enough to secure the retrieval hook of the filter and/or the neck portion of the filter. The novel device will open into a hook and once the tip is captured becomes a full secure closed loop. Doctors or radiologists use several tools to retrieve a tilted or embedded filter which is time-consuming and requires experience to prevent any damage to the vena cava wall or bricage of the filter. Our device doesn’t have any risk to the vena cava wall and unlike other devices, it can easily grasp the filter in the neck area with a circulation around the entire vena cava circumference that results in a faster retrieval compared to any existing device.


Retrieval of IVC filters, foreign bodies, wires, etc.


  • Easier and quicker retrieval.
  • Reduced recovery time as compared to more invasive methods such as forceps.
  • Shorter procedure time.
  • Less expensive than conventional methods.

IP Status: Patent Pending.

Patent Information:
Medical Device
For Information, Contact:
Lokesh Mohan
Licensing Associate
The University of Toledo
Munier Nazzal
Abdullah Nasif
Mohamed Osman
Ayman Ahmed
Soheila Alidad
Ghayth Ansarei
Zahra Alzahar
Sakeena Davis