The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2002
Filed:
Apr. 29, 1999
Applicant:
Inventor:
Joseph R. Madsen, Newton, MA (US);
Assignee:
Children's Medical Center Corporation, Boston, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61M 5/00 ;
U.S. Cl.
CPC ...
A61M 5/00 ;
Abstract
Variable anti-siphon devices are disclosed for use in cerebrospinal fluid shunt systems. Such devices can include a housing with an internal chamber, an adjustable barrier separating the chamber into two cavities, and a diaphragm that seats itself against the adjustable barrier with a seating force that is proportional to the pressure differential across it. The adjustable barrier advantageously allows the level of anti-siphon protection to be modified. In one embodiment, the height of the adjustable barrier may be varied. In another embodiment, the barrier is moved longitudinally within the internal chamber to vary the volume of each chamber.