Device and method for testing tissue

Abstract

An intraoperative tissue assessment device and method based on optical and mechanical techniques that allows a surgeon to assess certain mechanical properties of tissue samples. The device includes a cavity for housing and securing at least a portion of the tissue sample in communication with a pressurization source to inflate a portion of the tissue forming a dome of tissue having a height axis substantially perpendicular to the tissue sample secured within the cavity. The height of the dome of tissue along the height axis is generally proportional to the strength of the tissue sample. A source of illumination projects collimated light rays in the direction of the dome of tissue illuminating the dome of tissue and creating a Moiré fringe pattern, which may be used to determine the degree of anisotropy of the tissue sample when viewed through a viewing port arranged substantially directly above the dome of tissue.

We claim:  
     
         1 . A device for assessing the relative strength and degree of anisotropy of a tissue sample comprising: 
 a substantially circular pressure port in fluid communication with a pressurization source;    a cavity for housing and securing at least a portion of the tissue sample in communication with the pressure port such that the pressure from the pressurization source causes the portion of the tissue sample in fluid communication with the pressure port to inflate forming a dome of tissue having a height axis substantially perpendicular to the tissue sample secured within the cavity, wherein the height of the dome of tissue along the height axis is generally proportional to the strength of the tissue sample;    a source of illumination projecting collimated light rays in the direction of the dome of tissue illuminating the dome of tissue and creating a Moiré fringe pattern; and    a viewing port arranged substantially directly above the dome of tissue, wherein the Moiré fringe pattern on the illuminated dome of tissue may be viewed and used to determine the degree of anisotropy of the tissue sample.