Derek Douglas Walsh

US Patent:

20050010175, Jan 13, 2005

Filed:

Feb 27, 2004

Appl. No.:

10/788818

Inventors:

Daniel Beedon - Elmhurst IL, US
Erin Lundtveit - Wadsworth IL, US
Edwin Chim - Vernon Hills IL, US
Craig Sandford - Buffalo Grove IL, US
Derek Walsh - Wonder Lake IL, US
Jennifer Ikeda - Grayslake IL, US
Carol Johns - Antioch IL, US
Catherine Nguyen - Glenview IL, US
James Rose - Antioch IL, US
Atif Yardimci - Northbrook IL, US

International Classification:

A61M005/315

US Classification:

604218000

Abstract:

A piston assembly () for a flowable materials container having a barrel () defining a fluid containing chamber (). The barrel () is made of a body of a cyclic olefin containing polymer or a bridged polycyclic olefin containing polymer. An elastomeric piston () is slidably attached to the barrel () and provides a seal of the chamber. The piston () has a parylene coating on an outer surface thereof to reduce the necessary break away force. A plunger () is also provided and has a second mating member () removably connecting the plunger to a first mating member () of the piston. The first mating member () has a series of threads having a major diameter and a minor diameter, and the second mating member () has a series of threads having a major diameter and a minor diameter. The major and minor diameters of the second mating members () is appreciably smaller than the major and minor diameters of the other of the first mating member () to provide ease of connection.

US Patent:

50983857, Mar 24, 1992

Filed:

Apr 26, 1990

Appl. No.:

7/514772

Inventors:

Derek Walsh - Fox Lake IL

Assignee:

Baxter International Inc. - Deerfield IL

International Classification:

A61M 3700

US Classification:

604131

Abstract:

A disposable infuser is provided having a source of pressurized liquid contained in a liquid chamber (14). The liquid chamber (14) includes housing (20) defining an access aperture (83). A one-way duck-bill valve (80) is contained in the access aperture (83). A separate outlet conduit (84) is provided having a blunt cannula (98). When the outlet conduit (86) is attached to the housing (20), the blunt cannula (98) extends into the duck-bill valve (80) sufficiently to open the duck-bill valve (80) to establish fluid communication between the source of pressurized liquid (14) and the outlet conduit (84).