Frank Jay Keefer
Physician in Wheeling, WV
License number
Utah 183733-8905
Issued Date
Oct 29, 1990
Expiration Date
Jan 31, 2018
Category
Physician
Type
Physician/Surgeon CS (Schedule 2-5)
Address
Address
Wheeling, WV
Professional information
Bioerodible Diaphragm
US Patent:
4381772, May 3, 1983
Filed:
Nov 20, 1980
Appl. No.:
6/208569
Inventors:
Fernando G. Guistini - Wheeling WV
Frank J. Keefer - Wheeling WV
Robert F. Keefer - Morgantown WV
Frank J. Keefer - Wheeling WV
Robert F. Keefer - Morgantown WV
International Classification:
A61F 546
US Classification:
128132R
Abstract:
An improved contraceptive diaphragm is provided which has a bioerodible matrix that disintegrates in the vaginal fluids within a predetermined period of time. The matrix is made from a water soluble gel, more particularly from a water soluble polymeric resin gel, and preferably from a polyvinyl alcohol resin gel. The solubility of the water soluble gel in the vaginal fluids is controllably reduced for example, by heat treatment of the gel after formation of the diaphragm. The diaphragm does not have to be removed in a single piece, but is excreted as a slight vaginal discharge. In one aspect of the invention, a natural collagenous protein is embedded in the matrix to assure sealing adherence of the diaphragm when positioned in the vagina. In another aspect of the invention a hydrophilic material is provided at the center of the matrix to effectively absorb secreted cervical mucus thereby creating a dry passageway which will impede entrance of the sperm.