Blood Analyte Determinations
First Claim
1. An apparatus for measuring an analyte in blood taken from a patient, comprising:
- a. An analyte measurement system;
b. A fluidics system, adapted to remove blood from a body, transport a portion of the removed blood to the analyte measurement system for measurement, infuse a portion of the blood measured by the analyte measurement system back into the patient, flow a maintenance substance to the analyte measurement system without infusing a substantial amount of the maintenance substance into the patient, and flow at least a portion of the maintenance substance from the analyte measurement system to a waste channel.
0 Assignments
0 Petitions
Accused Products
Abstract
The present invention comprises methods and apparatuses that can provide measurement of glucose and other analytes with a variety of sensors without many of the performance-degrading problems of conventional approaches. An apparatus according to the present invention comprises a blood access system, adapted to remove blood from a body and infuse at least a portion of the removed blood back into the body. Such an apparatus also comprises an analyte sensor, mounted with the blood access system such that the analyte sensor measures the analyte in the blood that has been removed from the body by the blood access system. A method according to the present invention comprises removing blood from a body, using an analyte sensor to measure an analyte in the removed blood, and infusing at least a portion of the removed blood back into the body. The use of a non-contact sensor with a closed system creates a system will minimal infection risk.
-
Citations
23 Claims
-
1. An apparatus for measuring an analyte in blood taken from a patient, comprising:
-
a. An analyte measurement system; b. A fluidics system, adapted to remove blood from a body, transport a portion of the removed blood to the analyte measurement system for measurement, infuse a portion of the blood measured by the analyte measurement system back into the patient, flow a maintenance substance to the analyte measurement system without infusing a substantial amount of the maintenance substance into the patient, and flow at least a portion of the maintenance substance from the analyte measurement system to a waste channel. - View Dependent Claims (2, 3, 4, 5, 13)
-
-
6. An apparatus for determining an analyte property of blood, comprising:
-
a. a blood removal element, adapted to communicate blood with the circulatory system of a patient; b. A first fluid transport apparatus, in fluid communication with the blood removal element; c. A second fluid transport apparatus, in fluid communication with the blood removal element and the first fluid transport apparatus; d. A fluid pump, mounted with the first fluid transport apparatus such that the pump can draw fluid into and push fluid out of the first fluid transport apparatus; e. A fluid reservoir, in fluid communication with the fluid pump and adapted to supply a maintenance fluid to the fluid pump; f. An analyte sensor, in fluid communication with the second fluid transport apparatus; g. A waste system, in fluid communication with the second fluid transport apparatus. - View Dependent Claims (7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A blood access system comprising
a. a flow control valve in fluid communication with a catheter; -
b. an analyte sensor in fluid communication with a first side of the flow control valve; c. a hydraulically actuated syringe having a first side in fluid communication with a second side of the hydraulically actuated syringe; d. a first pinch valve having a first side in fluid communication with a second side of the hydraulically actuated syringe; e. a first pump having a first side in fluid communication with a second side of the first pinch valve; f. a saline reservoir in fluid communication with a second side of the first pump; g. a second pinch valve having a first side in fluid communication with the first side of the first pump and having a second side in fluid communication with a third side of the flow control valve; h. a second pump having a first side in fluid communication with a third side of the hydraulically actuated syringe; and i. a maintenance fluid container connection in fluid communication with a second side of the second pump.
-
Specification