Patent US2915226A successfully refreshed from Google Patents.
US4381772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bioerodible diaphragm
Assignee: Individual
•
Filing: 1980-11-20
•
Granted: 1983-05-03
•
Expires: 2000-11-20
Abstract
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.
Inventors
- 👤 Fernando G. Guistini
- 👤 Frank J. Keefer
- 👤 Robert F. Keefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0012; A61K9/0034; A61K9/0036; A61F; A61F6/00; A61F6/06; A61F6/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
37 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a water soluble gel.
Claim 2
Dependent Claim
37 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a water soluble gel.
Claim 3
Dependent Claim
39 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a heat treated water soluble gel.
Claim 4
Dependent Claim
39 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a heat treated water soluble gel.
Claim 5
Dependent Claim
39 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a water soluble polymeric resin gel.
Claim 6
Dependent Claim
39 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a water soluble polymeric resin gel.
Claim 7
Dependent Claim
40 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a water soluble polyvinyl alcohol resin gel.
Claim 8
Dependent Claim
40 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix being made from a water soluble polyvinyl alcohol resin gel.
Claim 9
Dependent Claim
49 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix consisting essentially of a heat treated water soluble polyvinyl alcohol resin gel, a plasticizer, and peripherally embedded collagenous particles.
Claim 10
Dependent Claim
49 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix consisting essentially of a heat treated water soluble polyvinyl alcohol resin gel, a plasticizer, and peripherally embedded collagenous particles.
Claim 11
Dependent Claim
55 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix consisting essentially of a heat treated water soluble polyvinyl alcohol resin gel, a plasticizer, peripherally embedded collagenous particles, centrally embedded hydrophilic crystals and a spermatocide.
Claim 12
Dependent Claim
55 words
A contraceptive vaginal diaphragm composed of a bioerodible matrix which disintegrates in the vaginal fluids within a selected predetermined period of time between 30 minutes to 30 hours, said matrix consisting essentially of a heat treated water soluble polyvinyl alcohol resin gel, a plasticizer, peripherally embedded collagenous particles, centrally embedded hydrophilic crystals and a spermatocide.
References Cited (Backward Citations)
US3143472A
Cited
US3443563A
Cited
US3763861A
Cited
US3986510A
Cited
US3811444A
Cited
US3888975A
Cited
US3971367A
Cited
US4180064A
Cited
US3914402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |