Hema Metrics, Inc.

Fresenius Medical Care Holdings, Inc.

Douglas L Cox

Perry N Law

David R Miller

David Allen Bell

Louis Leegrande Barrett

David W Peterson

Matthew A Stowell

Kristian Allen Sammann

Ronald S Glaittli

Songbiao Zhang

N Diane Hudkins

Bemjamin D Jensen

Embodiments of the disclosure provide a method for determining beginning blood volume of a patient during dialysis (e.g., hemodialysis). Ultrafiltration rates are determined at different time stamps during dialysis by obtaining a blood flowrate measurement and hematocrit measurements at input port and output port of a dialyzer connected to the patient. The flowrate and hematocrit measurements are used to determine fluid removed from the patient during dialysis. The ultrafiltration rates and fluid removed from the patient are used to determine the beginning blood volume of the patient.

Determination of patient blood volume at start of a dialysis treatment

A sensor clip assembly for an optical blood monitoring system includes a circuit board with a microprocessor that is programmed with a ratiometric model to calculate hematocrit and/or oxygen saturation levels of a patient.

Sensor clip assembly for an optical monitoring system

A cuff for measuring volume and change in volume of a body appendage includes a hollow, rigid tube having an inner surface; and a bladder having an inner surface and an outer surface, the ends of the bladder being sealed to the ends of the tube to create an enclosed internal volume between the inner surface of the bladder and the inner surface of the tube and an external volume defined by the outer surface of the bladder and surrounded by the internal volume, the bladder having a normal, relaxed state, in which the internal volume is filled with a fluid and a retracted state in which the fluid is evacuated from the internal volume. Two stiffener ribs placed on the inner surface of the bladder, parallel to each other and to the lengthwise axis of the tube at diametrically opposite positions. A plurality of emitters and detectors arranged in a linear array are embedded in one of the ribs, so as to emit and detect light through the bladder. A fluid port extending through the tube and communicating with the internal volume, through which the internal volume can be filled with or emptied of the fluid.

Bladder-based cuff for measuring physiological parameters and method of measuring physiological parameter using same

Bladder-based cuff for measuring physiological parameters and method of measuring physiological parameters using same

An optical sensor includes a sensing pair of complementary emitter and detector elements for measuring the bulk absorptivity (&agr;) of an area parallel to and including a hemodialysis access site, and a normalizing pair of complementary emitter and detector elements for measuring the absorptivity (&agr; ) of the tissue itself perpendicular to the access site. The pairs of emitter and detector elements define two lines at right angles to each other, and one of the pairs lies to one side of the line defined by the other of the pairs, such that the two pairs of emitter and detector elements form a &ldquo;T&rdquo; shape. Indicator dilution techniques are used to measure vascular access flow rates during routine hemodialysis, using the sensor.

Sensor for transcutaneous measurement of vascular access blood flow

Growing community of inventors

Morgan, UT, United States of America

Douglas L Cox