Patent ID: 7427268

Claim:
A closed cuff for use in inferential measurement of animal arterial blood pressures, comprising: an inflatable ring-shaped bladder having an inner portion and an outer portion, wherein said inner and outer portions are formed from non-distensible material, wherein said bladder is defined by a single tubular starting element formed into said ring shape by connecting opposite ends of said tubular starting element, defining a ring having a non-adjustable fixed outer circumference, wherein said outer portion remains outward of said ring and said inner portion remains inward of said ring such that the interior of said single tubular starting element defines a chamber for air inflation in blood pressure measurement, wherein said inner portion of said bladder is adapted to be in direct contact with a user's extremity when said cuff is in use, and wherein said bladder is unconstrained axially of said ring shape during inflation thereof and becomes toroidal in shape, and wherein said single tubular starting element is seamless.