Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1996-10-23
1998-05-19
Thorpe, Timothy
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
417412, 128DIG12, F04B 4300
Patent
active
057528136
ABSTRACT:
A method for the enhanced accuracy in dispensing from a fluid roller dispensing pump, wherein a keyed one way insertable cassette with pump compressible tubing is utilized with the fluid dispensing pump. The cassette holds and maintains a compressible plastic tube adjacent a roller pump, whereby the rollers of the pump compress the tubing to draw and accurately dispense predetermined exact amounts of liquids into vials, hypodermics and the like for accurate medical and/or laboratory use, and wherein slightly improper placement still provides dispensing but with not always detectable inaccuracies. The cassette is provided with positive proper position indicator elements to ensure both proper orientation and complete locking engagement to ensure accurate pumping and dispensing. In a preferred embodiment the pump embodies current use sensors which determine if the cassette, which causes the pump to use more current, is present. A keyed one-way cassette fitting prevents improper placement.
REFERENCES:
patent: D264134 (1982-04-01), Xanthopoulos
patent: 4605396 (1986-08-01), Tseo et al.
patent: 4735558 (1988-04-01), Kienholz et al.
patent: 4784577 (1988-11-01), Ritson et al.
patent: 4790816 (1988-12-01), Sundblom et al.
patent: 5364342 (1994-11-01), Beuchat et al.
Dahlhauser Lawrence J.
Feigenbaum Jeffrey H.
Gorn Steven
Meadow Stuart
Nicholson Laurence R.
A.Z.E. Medical Inc.
Nissenbaum Israel
Thorpe Timothy
Tyler Cheryl J.
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