Citrate detector for blood processing system
First Claim
1. A citrate detector for use in combination with a blood processing system and a replacement fluid flow conduit of a disposable set, the citrate detector comprising:
- a light source positioned and configured to emit a light onto the replacement fluid flow conduit of the disposable set and a fluid flowing through the replacement fluid flow conduit, the light having a wavelength absorbed by citrate, but at least partially transmitted by the replacement fluid flow conduit;
a light detector positioned so as to receive at least a portion of the light from the light source that is exiting or reflected by the fluid in the replacement fluid flow conduit and generate a signal indicative of the presence or absence of citrate in the fluid in the replacement fluid flow conduit based, at least in part, on the amount of light received from the light source; and
a flow detector configured to determine the presence of fluid in the replacement fluid flow conduit prior to the light source emitting light onto the replacement fluid flow conduit and the fluid flowing through the replacement fluid flow conduit.
1 Assignment
0 Petitions
Accused Products
Abstract
A citrate detector is provided for use in combination with a blood processing system and replacement fluid tubing or conduit of a disposable set. The citrate detector comprises a light source and a light detector. The light source is configured to emit a light having a wavelength absorbed by citrate, but at least partially transmitted by the replacement fluid conduit of the disposable set. The light detector is configured to receive at least a portion of the light from the light source and generate a signal indicative of the presence or absence of citrate in the replacement fluid conduit based, at least in part, on the amount of light received from the light source. A blood processing system incorporating such a citrate detector may include a flow detector for determining whether fluid is present in the conduit prior to checking for the presence of citrate.
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Citations
21 Claims
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1. A citrate detector for use in combination with a blood processing system and a replacement fluid flow conduit of a disposable set, the citrate detector comprising:
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a light source positioned and configured to emit a light onto the replacement fluid flow conduit of the disposable set and a fluid flowing through the replacement fluid flow conduit, the light having a wavelength absorbed by citrate, but at least partially transmitted by the replacement fluid flow conduit; a light detector positioned so as to receive at least a portion of the light from the light source that is exiting or reflected by the fluid in the replacement fluid flow conduit and generate a signal indicative of the presence or absence of citrate in the fluid in the replacement fluid flow conduit based, at least in part, on the amount of light received from the light source; and a flow detector configured to determine the presence of fluid in the replacement fluid flow conduit prior to the light source emitting light onto the replacement fluid flow conduit and the fluid flowing through the replacement fluid flow conduit. - View Dependent Claims (2, 3, 4, 5)
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6. A blood processing system for use in combination with a replacement fluid flow conduit of a disposable set and comprising:
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a citrate detector including a light source positioned and configured to emit a light onto the replacement fluid flow conduit of the disposable set and a fluid flowing through the replacement fluid flow conduit, the light having a wavelength absorbed by citrate, but at least partially transmitted by the replacement fluid flow conduit, a light detector positioned so as to receive at least a portion of the light from the light source that is exiting or reflected by the fluid in the replacement fluid flow conduit and generate a signal indicative of the presence or absence of citrate in the replacement fluid flow conduit based, at least in part, on the amount of light received from the light source; a controller configured to receive the signal from the light detector and determine whether citrate is present in the fluid in the replacement fluid flow conduit based, at least in part, on the signal; and a light-absorbing member adjacent to the light source and configured to absorb ultraviolet light. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of monitoring fluid within a blood processing system having a replacement fluid flow conduit, the method comprising:
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flowing a fluid through the replacement fluid flow conduit; determining whether fluid is present in the replacement fluid flow conduit; after determining that fluid is present in the replacement fluid flow conduit, directing light into the replacement fluid flow conduit, the light having a wavelength absorbed by citrate, but at least partially transmitted by the replacement fluid flow conduit; detecting light exiting or reflected by the fluid in the replacement fluid flow conduit; and determining whether citrate is present in the fluid in the replacement fluid flow conduit based, at least in part, on the light exiting or reflected by the fluid in the replacement fluid flow conduit. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A citrate detector for use in combination with a blood processing system and a replacement fluid flow conduit of a disposable set, the citrate detector comprising:
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a light source positioned and configured to emit a light onto the replacement fluid flow conduit of the disposable set and a fluid flowing through the replacement fluid flow conduit, the light having a wavelength absorbed by citrate, but at least partially transmitted by the replacement fluid flow conduit; a light detector positioned so as to receive at least a portion of the light from the light source that is exiting or reflected by the fluid in the replacement fluid flow conduit and generate a signal indicative of the presence or absence of citrate in the fluid in the replacement fluid flow conduit based, at least in part, on the amount of light received from the light source; and a light-absorbing member adjacent to the light source and configured to absorb ultraviolet light.
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21. A method of monitoring fluid within a blood processing system having a replacement fluid flow conduit, the method comprising:
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flowing a fluid through the replacement fluid flow conduit; directing light into the replacement fluid flow conduit, the light having a wavelength absorbed by citrate, but at least partially transmitted by the replacement fluid flow conduit; detecting light exiting or reflected by the fluid in the replacement fluid flow conduit; and determining whether citrate is present in the fluid in the replacement fluid flow conduit based, at least in part, on the light exiting or reflected by the fluid in the replacement fluid flow conduit, wherein said detecting light exiting or reflected by the fluid in the replacement fluid flow conduit includes absorbing environmental light prior to said environmental ultraviolet light being detected.
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Specification