초록 ▼

Intraarterial blood pressure is measured noninvasively by an electromechanical transducer (22) that includes an array of transducer elements (22-1 through 22-19). The transducer extends across an artery (24) with transducer elements at the ends of the array extending beyond opposite edges of the art

Intraarterial blood pressure is measured noninvasively by an electromechanical transducer (22) that includes an array of transducer elements (22-1 through 22-19). The transducer extends across an artery (24) with transducer elements at the ends of the array extending beyond opposite edges of the artery. A set of diastolic and/or systolic pressure and pulse amplitude values is obtained from the outputs from the transducer elements, which values are stored in computer (62). Information concerning the subject related to the diameter of the underlying artery including, for example, the subject\s age, weight, arm and wrist diameter also is entered into computer (62) through keyboard (64), from which information an estimation of the diameter of the underlying artery is obtained. Using the set of pulse amplitude values, a transducer element at the center of a search area located substantially at the center of the artery is identified. A center of gravity, a two humps and/or a curve fitting method may be used to identify the transducer element at the center of the search area. A group of transducer elements that overlies the artery of estimated diameter then is identified. Using outputs from only said group of transducer elements, one transducer element having a local minimum of one of the diastolic and systolic pressures, relative to the transducer at the center of the search area, is identified, which transducer element is selected for monitoring blood pressure.

대표청구항 ▼

A system for the continuous external measurement of blood pressure in an underlying artery of a subject including an array of individual pressure sensitive elements, the length of which array exceeds the diameter of the underlying artery, means employing outputs from all elements of the array for id

A system for the continuous external measurement of blood pressure in an underlying artery of a subject including an array of individual pressure sensitive elements, the length of which array exceeds the diameter of the underlying artery, means employing outputs from all elements of the array for identifying one element at a center of a region to be searched, user information input means for entering information concerning the subject related to the diameter of the underlying artery into the system, means employing said information concerning the subject related to the diameter of the underlying artery for estimating an extent of said region to be searched, and means responsive to outputs from only those elements within said region for selecting one element having a local minimum of at least one of the diastolic and systolic pressures on a plot of diastolic or systolic pressure versus transducer element number.