Blood parameter measurement device
First Claim
Patent Images
1. A system for measuring one or more parameters of blood comprising:
- a cassette having a chamber for receiving a quantity of blood, said cassette including at least one optical sensor; and
a device having a housing with a coupling for releasably connecting to said cassette, said device including at least one light source fixed to said housing for directing light toward said at least one sensor, at least one light detector fixed to said housing for detecting light from said at least one sensor, and at least one signal converter fixed to said housing and connected to said at least one light detector, said at least one signal converter providing a digital output signal that varies in response to the quantity of light detected by said at least one light detector.
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Abstract
A blood parameter measurement device especially useful for surgical procedures includes a compact housing with a light source, light detector and signal converter contained within the housing. In use, the device is releasably coupled to a cassette that can be either used as an in-line cell in series with a cardiopulmonary by-pass circuit, or in another passageway that shunts the cardiopulmonary by-pass circuit. Preferably, the housing of the device has a longitudinal axis that extends in a direction generally parallel to the direction of blood flowing through the cassette.
355 Citations
33 Claims
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1. A system for measuring one or more parameters of blood comprising:
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a cassette having a chamber for receiving a quantity of blood, said cassette including at least one optical sensor; and a device having a housing with a coupling for releasably connecting to said cassette, said device including at least one light source fixed to said housing for directing light toward said at least one sensor, at least one light detector fixed to said housing for detecting light from said at least one sensor, and at least one signal converter fixed to said housing and connected to said at least one light detector, said at least one signal converter providing a digital output signal that varies in response to the quantity of light detected by said at least one light detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for measuring one or more parameters of blood comprising:
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a housing having a coupling for releasable connection to a blood parameter measurement cassette having a sensor; a light source; a first set of optical fibers optically coupled to said light source; a first light detector and a second light detector; an optical reference material; and a second set of optical fibers coupled to said light detectors, said first set of optical fibers including a first group of optical fibers for directing light from said light source to the sensor and a second group of optical fibers for directing light from said light source to said reference material, said second set of optical fibers including a first group of optical fibers for directing light from the sensor to said first light detector and a second group of optical fibers for directing light from said reference material to said second detector; and a signal converter connected to each light detector, said signal converter providing at least one output signal that varies in response to the quantity of light detected by said first detector and said second detector, wherein said light source, said light detector, said first set of optical fibers, said second set of optical fibers, said reference material and said signal converter are all contained within said housing. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A system for measuring one or more parameters of blood comprising:
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a device having an elongated housing with a coupling, at least one light source fixed to said housing and at least one light detector fixed to said housing; and a cassette having wall sections defining a chamber for receiving a quantity of blood, said cassette including a coupling for releasably connecting said cassette to said device, said cassette including at least one sensor connected to said wall sections for sensing at least one parameter of the blood in said chamber, wherein said chamber includes an inlet port and an outlet port for enabling the flow of blood through said chamber along a certain path, and wherein said certain path extends in a direction substantially parallel to the longitudinal axis of said housing. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification