Archive for February 9, 2009
Hi, this is Rabbi, Dr. Yosef Freedland, Surgeon, and Patent Attorney on Medical Devices at Appelfeld Zer Fisher.
Let’s get down to some specific medical devices, for example cardiac stents, and how to write a patent on an invention in crowded terrain.
Before continuing, I must apologize to Ze’ev Fisher, of Appelfeld Zer Fisher, for writing this Blog in several posts; which is not the way Ze’ev Fisher prefers. However, this is the only way to go, in my humble opinion, in order to provide appropriate background related to the heart.
C’mon Ze’ev, have a heart.
Everybody, besides people in Kazakhstan like Borat Sagdiyev, are aware about stents.
For the sake of Borat, we will examine a bit about stents and specifically Cardiac Stents.
A stent is a mesh in a tubular configuration that is expanded in a hollow passage to open up an area that is blocked, usually by tissue. Cardiac stents are expanded in a heart artery to open up a partially blocked area of the artery.
There are two major types of cardiac stents as of this post: bare metal stents and jacketed stents.
Jacketed stents include a tubular stent frame covered by a jacket. The jacket often comprises a dense mesh of polymer fibers which prevents tissue from growing between the large holes in the stent frame.
Jacketed stents usually prevent restenosis but result in other problems.
These tissue cells, referred to as endothelial cells, can break away from the polymer fibers. Mobilized endothelial cells attract platelets, and form a large clump of dangerous cells, referred to as an embolism.
An embolism is a very nasty creature that can lodge in a blood vessel that feeds an organ with nourishment from blood and cause a portion of organ tissue to die.
Up to 2% of all jacketed stents eventually result in necrosis of vital organs as a result of mobilized endothelial cells that have formed into an embolism.
It is not very good to have dead tissue in an organ, particularly in the brain where the dead tissue causes a stroke. Then again, an embolism isn’t very good when it lodges in the heart, kidneys, or lungs, either. So the best idea is to stay away from things that can cause an embolism.
No Good Options
And this doesn’t leave a stent recipient with many good options: If you opt for a bare metal stent, you can get a re-blockage of the vessel.
OK, so this is Rabbi, Dr. Yosef Freedland, Surgeon, and Patent Attorney signing off just before we finish explaining how bad the problem is that YOU are going to solve.