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:
Dec. 09, 1980
Filed:
Nov. 28, 1979
Applicant:
Inventor:
Alan S Michaels, San Francisco, CA (US);
Assignee:
Alza Corporation, Palo Alto, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
A61M / ;
U.S. Cl.
CPC ...
128341 ; 128130 ;
Abstract
A self-powered cervical dilator is disclosed. The dilator comprises (1) an expandable housing positioned around (2) a swellable laminate, which laminate surrounds (3) a support member. The laminate comprises (a) a lamina formed of an absorbent material laminated to (b) a lamina formed of a swellable polymer facing the housing. In operation, when the dilator is in the cervical canal, fluid therefrom is imbibed by the laminate into the dilator causing the laminate to swell and apply pressure against and expand the housing, which housing correspondingly exerts force against the walls of the cervical canal thereby dilating the canal.