Tourniquet with Patterns of Cavities and Ridges on Surfaces

A tourniquet for restricting a flow of blood in a body part, the tourniquet comprising:

• a slip-resistant, elongated strap including two patterns of cavities and ridges on top and bottom surfaces respectively, the pattern of cavities and ridges comprising:
• a plurality of spaced cavities arranged in parallel rows, the cavity being rectangular and including two first slopes on two short sides respectively and two second slopes on two elongated sides respectively, the first slopes having an elevation greater than that of the second slopes, the second slopes oriented in a direction the same as that of the strap, and the second slopes having an inclined degree greater than that of the first slopes;
• and
• a plurality of spaced depressions arranged in parallel rows, the depression being adjacent to the cavity widthwise, the depression being rectangular, and the depression including two third slopes on two short sides respectively and two fourth slopes on two elongated sides respectively;
• wherein the cavity has a first depth, and the depression has a second depth less than the first depth;
• wherein the cavities and the depressions are arranged in alternating fashion;
• wherein the first slope and the third slope are joined to form a first ridge, and the second slope and the fourth slope are joined to form a second ridge, and the first ridge has an elevation greater than that of the second ridge;
• and
• wherein length of the third slope is less than that of the first slope, length of the fourth slope is less than that of the second slope, and length of the fourth slope is greater than that of the first slope.