Parkinson's & Movement disorders

Focused ultrasound for treating Parkinson's disease to be tested

(Medical Xpress)—After a promising clinical trial of focused ultrasound as a potential treatment for essential tremor, the University of Virginia Health System is launching a new study to investigate the scalpel-free technology's ...

Cardiology

Procedure to open blocked carotid arteries tested

(Medical Xpress)—Doctors at Washington University School of Medicine in St. Louis are investigating a minimally invasive procedure to open blocked carotid arteries in patients whose poor health or advanced age makes the ...

Medical research

Air shield keeps bacteria out of open wounds

This spring, Nimbic Systems, based near Houston, Texas, received Food and Drug Administration (FDA) clearance for the company's Air Barrier System, a unique medical device for reducing surgical-incision site contamination ...

Other

Sticky solution for surgical sealants

(Medical Xpress) -- A Monash University researcher has developed a new form of surgical sealant that is not only easier for surgeons to manipulate, allowing for a more effective application, but significantly reduces the ...

Other

New device could reduce surgical scarring

Researchers at Stanford University have developed a special wound dressing that they report was able to significantly reduce scar tissue caused by incisions.

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Cutting

Cutting is the separation of a physical object, or a portion of a physical object, into two portions, through the application of an acutely directed force. An implement commonly used for cutting is the knife or in medical cases the scalpel. However, any sufficiently sharp object is capable of cutting if it has a hardness sufficiently larger than the object being cut, and if it is applied with sufficient force. Cutting also describes the action of a saw which removes material in the process of cutting.

Cutting is a compressive and shearing phenomenon, and occurs only when the total stress generated by the cutting implement exceeds the ultimate strength of the material of the object being cut. The simplest applicable equation is stress = force/area: The stress generated by a cutting implement is directly proportional to the force with which it is applied, and inversely proportional to the area of contact. Hence, the smaller the area (i.e., the sharper the cutting implement), the less force is needed to cut something.

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