Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1991-07-25
1992-08-18
Green, Randall L.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
128DIG13, A61M 2501
Patent
active
051394820
ABSTRACT:
An apparatus for signalling an accidental loss of blood from a patient's fluid infusion line includes a sensor assembly for connection to the line, the assembly having a housing for receiving a portion of the line within a side opening, a holder having a clamp member for drawing together portions of the housing on opposite sides of the side opening for fixing the portion of the line within the opening relative to the housing, a source of radiation directed through the opening for intersecting the line, and a radiation detector in the housing for receiving radiation that is transmitted from the source through the line. The apparatus further includes a battery powered circuit, the circuit intermittently powering the radiation source, and producing a reference voltage, a train of signal pulses forming a sensor signal that is indicative of the radiation received by the detector and, when the sensor signal is in a predetermined relationship with the reference signal, an alarm signal. The alarm signal is produced by an audio output transducer, a switch for powering the transducer being responsive to the signal pulses and enabled by a train of output enable pulses that are synchronized with the activation of the radiation source for producing a distinctive audio output.
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IBM Tech. Bulletin, E. R. Ellenwood, vol. 12, No. 5, Oct. 1969.
Lewis Donald E.
Simeon Paula S.
Green Randall L.
Jones Mary Beth O.
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