Title:
気泡滞留の少ない使い捨て注入カセットおよび改良型バルブ
Document Type and Number:
Japanese Patent JP2005509457
Kind Code:
A
Abstract:
A disposable cassette for use with a medical infusion pump. An elastomeric membrane is captured between a facing member and a base of the cassette and is displaced into a pumping chamber. The elastomeric membrane includes a generally T-shaped lip, and corresponding grooves are provided on the facing member and base. As the cassette is assembled, an interference fit between the lip and the grooves causes the membrane to stretch taut and to be securely anchored, eliminating a break-in period when the cassette is initially used. "Lobes" of increased thickness provided on the undersurface of a portion of the elastomeric membrane overlying the pumping chamber reduce the residual volume of the pumping chamber, thereby reducing the volume of air retained within the chamber and increasing the accuracy of the cassette. The lobes also sweep air bubbles from the sides of the pumping chamber during operation, further reducing air bubbles retained in the pumping chamber. A distal tube support retains a distal fluid line between air or pressure sensors included on a pump drive mechanism, thus reducing the likelihood of sensing errors. Inlet and outlet valve flaps and corresponding seating surfaces included in the base are configured to provide quieter operation, further reduce the residual volume of the pumping chamber, increase fluid velocity through the outlet valve to sweep air bubbles from the pumping chamber, and protect against a "blown" inlet valve.
Inventors:
Lawless, Mike Davrill
Soberon, alexus pee
Day Huembo, Scott M
Jiata Day
The Jonston, David
Brows, robert
Soberon, alexus pee
Day Huembo, Scott M
Jiata Day
The Jonston, David
Brows, robert
Application Number:
JP2002585005A
Publication Date:
April 14, 2005
Filing Date:
March 11, 2002
Export Citation:
Assignee:
ABBOTT LABORATORIES
International Classes:
A61M1/00; A61M5/142; F04B43/00; F04B43/02; A61M5/36; (IPC1-7): A61M1/00
Attorney, Agent or Firm:
Yoshio Kawaguchi
Akio Ichiiri
Makoto Ono
Katsuma Osaki
Mitsuaki Tsubokura
Akio Ichiiri
Makoto Ono
Katsuma Osaki
Mitsuaki Tsubokura