Indirect piezoelectric drop counter and method

Details Indirect piezoelectric drop counter and method Indirect piezoelectric drop counter and method

1985-03-29

1986-04-22

Coven, Edward M.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

310311, 128DIG13, A61M 516

Patent

active

045839751

ABSTRACT:
The present invention provides an accurate method and apparatus for monitoring the drop flow rate from a fluid source. The drops are indirectly sensed by piezoelectric means mounted on a drip chamber when the drops impinge on a fluid surface in the chamber. The chamber can include a second differential piezoelectric sensing element, which provides a noise reference signal which can be subtracted from the drop sensing signal. The volume of the fluid drops sensed can be determined. The sensing element can be incorporated in open and closed loop disposable chamber modules which can include both monitoring and occlusion valving functions integral therewith.

REFERENCES:
patent: 3500366 (1970-03-01), Chesney et al.
patent: 3557616 (1971-01-01), Landon, Jr. et al.
patent: 3563090 (1971-02-01), Deltour
patent: 3596515 (1971-08-01), Cramer
patent: 3611341 (1971-10-01), Craig et al.
patent: 3881353 (1975-05-01), Fathauer
patent: 3898983 (1975-08-01), Elam
patent: 3990443 (1976-11-01), Fletcher
patent: 4018362 (1977-04-01), Ubaud
patent: 4037598 (1977-07-01), Georgi
patent: 4073193 (1978-02-01), Mastandrea
patent: 4105028 (1978-08-01), Sadlier et al.
patent: 4131815 (1978-12-01), Bontright
patent: 4137940 (1979-02-01), Faisandier
patent: 4181130 (1980-01-01), Bailey
patent: 4282532 (1981-08-01), Markham
patent: 4286590 (1981-09-01), Murase
patent: 4296417 (1981-10-01), Markham et al.
patent: 4314484 (1982-02-01), Bowman
patent: 4346606 (1982-08-01), Cannon et al.
patent: 4383252 (1983-05-01), Purcell et al.
patent: 4401909 (1983-08-01), Gorsek
patent: 4419598 (1983-12-01), Spitz et al.
patent: 4419599 (1983-12-01), Micheron
"Piezoelectric Transducers", on or before 6/24/83, p. 124.
"Machine Design", on or before 4/10/83, p. 46.
"Kynar Piezofilm", on or before 4/10/83.

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