Devices, systems, and methods for measuring blood loss
First Claim
Patent Images
1. A blood measurement device for determining the amount of blood of a subject within a fluid sample, the fluid sample having a volume and being positioned within a container having a vertical axis, the blood measurement device comprising:
- at least one light source configured to selectively generate light at a first wavelength and at a second wavelength different from the first wavelength;
at least one light detector, wherein the at least one light source and the at least one light detector are configured for positioning in an operative position within the container, wherein, in the operative position, the at least one light source is configured to transmit light at a plurality of locations spaced along the vertical axis of the container and the at least one light detector is configured to receive at least a portion of the light generated by the at least one light source, and wherein upon positioning of the at least one light source and the at least one light detector in the operative position, the at least one light detector is configured to produce a first signal indicative of the absorbance of the fluid sample at the first wavelength and a second signal indicative of the absorbance of the fluid sample at the second wavelength; and
a processor operatively coupled to the at least one light detector, wherein the processor is configured to receive the first and second signals from the at least one light detector, and wherein, based upon the received first and second signals, the processor is configured to repeatedly determine the concentration of hemoglobin within the fluid sample as blood from the subject is added to the fluid sample,wherein the processor is configured to determine a current volume of blood within the fluid sample based upon a previously measured hemoglobin concentration of the subject, the determined hemoglobin concentration within the fluid sample, and the volume of the fluid sample.
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Accused Products
Abstract
Devices, systems, and methods for measuring the blood loss of a subject during a medical procedure. Blood and other fluids are received within a container, and a blood measurement device determines the hemoglobin concentration of the fluid within the container. The blood measurement device can also calculate the estimated blood loss of the subject based upon the determined hemoglobin concentration and the volume of the fluid within the container and the patient'"'"'s hemoglobin.
56 Citations
28 Claims
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1. A blood measurement device for determining the amount of blood of a subject within a fluid sample, the fluid sample having a volume and being positioned within a container having a vertical axis, the blood measurement device comprising:
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at least one light source configured to selectively generate light at a first wavelength and at a second wavelength different from the first wavelength; at least one light detector, wherein the at least one light source and the at least one light detector are configured for positioning in an operative position within the container, wherein, in the operative position, the at least one light source is configured to transmit light at a plurality of locations spaced along the vertical axis of the container and the at least one light detector is configured to receive at least a portion of the light generated by the at least one light source, and wherein upon positioning of the at least one light source and the at least one light detector in the operative position, the at least one light detector is configured to produce a first signal indicative of the absorbance of the fluid sample at the first wavelength and a second signal indicative of the absorbance of the fluid sample at the second wavelength; and a processor operatively coupled to the at least one light detector, wherein the processor is configured to receive the first and second signals from the at least one light detector, and wherein, based upon the received first and second signals, the processor is configured to repeatedly determine the concentration of hemoglobin within the fluid sample as blood from the subject is added to the fluid sample, wherein the processor is configured to determine a current volume of blood within the fluid sample based upon a previously measured hemoglobin concentration of the subject, the determined hemoglobin concentration within the fluid sample, and the volume of the fluid sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A blood measurement system comprising:
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a blood measurement device for determining the amount of blood of a subject within a fluid sample, the fluid sample having a volume, the blood measurement device comprising; at least one light source configured to selectively generate light at a first wavelength and at a second wavelength different from the first wavelength; at least one light detector; and a processor operatively coupled to the at least one light detector; and a suction canister, the suction canister having a vertical axis and an outer wall having an internal surface and an external surface, the internal surface of the outer wall defining an interior space configured to receive the fluid sample, wherein the at least one light source and the at least one light detector are configured for positioning in an operative position within the container, wherein, in the operative position, the at least one light source is configured to transmit light at a plurality of locations spaced along the vertical axis of the container and the at least one light detector is configured to receive at least a portion of the light generated by the at least one light source, and wherein upon positioning of the at least one light source and the at least one light detector in the operative position, the at least one light detector is configured to produce a first signal indicative of the absorbance of the fluid sample at the first wavelength and a second signal indicative of the absorbance of the fluid sample at the second wavelength, wherein the processor is configured to receive the first and second signals from the at least one light detector, and wherein, based upon the received first and second signals, the processor is configured to repeatedly determine the concentration of hemoglobin within the fluid sample as blood from the subject is added to the fluid sample, and wherein the processor is configured to determine a current volume of blood within the fluid sample based upon a previously measured hemoglobin concentration of the subject, the determined hemoglobin concentration within the fluid sample, and the volume of the fluid sample. - View Dependent Claims (17, 18, 19, 20)
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21. A method of measuring the amount of blood of a subject within a fluid sample, comprising:
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operatively positioning a blood measurement device relative to a fluid sample within a container having a vertical axis, the blood measurement device comprising; at least one light source, wherein the at least one light source selectively generates light at a first wavelength and at a second wavelength different from the first wavelength; at least one light detector, wherein following operative positioning of the blood measurement device, the at least one light source transmits light at a plurality of locations spaced along the vertical axis of the container; and a processor operatively coupled to the at least one light detector; using the at least one light detector to receive at least a portion of the light generated by the at least one light source, wherein the at least one light detector produces a first signal indicative of the absorbance of the fluid sample at the first wavelength and a second signal indicative of the absorbance of the fluid sample at the second wavelength; using the processor to receive the first and second signals from the at least one light detector; using the processor of the blood measurement device to repeatedly determine the concentration of hemoglobin within the fluid sample as blood from the subject is added to the fluid sample; and using the processor of the blood measurement device to determine a current volume of blood within the fluid sample based upon a previously measured hemoglobin concentration of the subject, the determined hemoglobin concentration within the fluid sample, and the volume of the fluid sample. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification