Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1985-03-22
1987-07-21
Croyle, Carlton R.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
7386141, A61M 5165
Patent
active
046815694
ABSTRACT:
A rate meter for use with an IV fluid administration system having a vertical transparent drip chamber, the rate meter having an elongated housing having a notch therein for receiving the drip chamber, and a spring bias moveable portion which engages the drip chamber so that the housing is held to the drip chamber in a horizontal manner, the housing having two light emitters positioned on one side of the drip chamber and a photodetector on the other side, the light path between the light emitters and the photodetector being affected by passages of drops of fluid through the drip chamber, circuitry for computing a volumetric flow rate based on the frequency of detected drops, an indicator for displaying the detected flow rate and a self-contained battery. The two light emitters are arranged to provide equal light intensity on the photodetector. The rate meter is further identified by the provision of an occluder element forming a part of the housing slideable portion which moves to intercept the light beam from one of the light emitters when the housing is removed from engagement with a drip chamber to provide an OFF signal employed by program instructions to de-energize most of the circuit components to thereby prolong battery life.
REFERENCES:
patent: 3449952 (1969-06-01), Brown et al.
patent: 3563090 (1971-02-01), Deltour
patent: 3596515 (1971-08-01), Cramer
patent: 4181130 (1980-01-01), Bailey
patent: 4346606 (1982-08-01), Cannon
patent: 4397648 (1983-08-01), Knute
patent: 4475905 (1984-10-01), Himmelstrup
Arkans Edward J.
Coble Stephen J.
Croyle Carlton R.
Olds Theodore
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