Devices for Continuous Measurement of Glucose in Body Fluid
First Claim
1. A device for monitoring a constituent of body fluid continuously or repeatedly over a time period, the device comprising:
- (a) a body fluid sampling system including;
(i) a cannula for defining a fluid path for withdrawing body fluid from the body,(ii) a fluid sink for storing a quantity of spent body fluid, and(iii) a pumping arrangement for generating a net flow of body fluid from said cannula to said fluid sink; and
(b) an optical sensor arrangement associated with said body fluid sampling system and configured for determining a concentration of at least one constituent of the body fluid.
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Abstract
A device for monitoring a constituent of body fluid continuously or repeatedly over a time period includes a body fluid sampling system and an optical sensor arrangement. The sampling system has a pumping arrangement which pumps body fluid from a cannula to a fluid sink. The optical sensor determines a concentration of at least one constituent of the body fluid. The pumping arrangement preferably ejects drops of body fluid from a fine nozzle. According to certain embodiments, optical sensor arrangements ensure that the optical paths do not pass through surfaces wetted by the fluid to be examined.
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Citations
27 Claims
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1. A device for monitoring a constituent of body fluid continuously or repeatedly over a time period, the device comprising:
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(a) a body fluid sampling system including; (i) a cannula for defining a fluid path for withdrawing body fluid from the body, (ii) a fluid sink for storing a quantity of spent body fluid, and (iii) a pumping arrangement for generating a net flow of body fluid from said cannula to said fluid sink; and (b) an optical sensor arrangement associated with said body fluid sampling system and configured for determining a concentration of at least one constituent of the body fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A device for monitoring a constituent of body fluid continuously or repeatedly over a time period, the device comprising:
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(a) a body fluid sampling system including; (i) a cannula for defining a fluid path for withdrawing body fluid from the body, (ii) a fluid sink for storing a quantity of spent body fluid, and (iii) a pumping arrangement for generating a net flow of body fluid from said cannula to said fluid sink; and (b) a sensor arrangement associated with said body fluid sampling system and configured for determining a concentration of at least one constituent of the body fluid, wherein said pumping arrangement includes a nozzle arrangement for ejecting drops of the body fluid and a pulse generator for generating a pressure pulse within the body fluid so as to eject a drop from said nozzle arrangement.
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26. A device for monitoring a constituent of body fluid continuously or repeatedly over a time period, the device comprising:
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(a) a body fluid sampling system including; (i) a cannula for defining a fluid path for withdrawing body fluid from the body, (ii) a fluid sink for storing a quantity of spent body fluid, (iii) a pumping arrangement for generating a net flow of body fluid from said cannula to said fluid sink amid (iv) a pulse generator for generating a pressure pulse within the body fluid through said cannula; and (b) a sensor arrangement associated with said body fluid sampling system and configured for determining a concentration of at least one constituent of the body fluid. - View Dependent Claims (27)
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Specification