Abstract An intravaginal insert, serving as a mechanical and chemical contraceptive barrier is described. The insert consists of a thin circular disc bilayer of a resilient and fluid absorbent sponge, preferably made of collagen, laminated on the inside with a soft membrane. Both layers of laminated sponge are connected at the circumference to form a pocket with a small opening. A spermicide, preferably a detergent, is deposited within the matrix of the sponge, which is also buffered to pH 4 to 5. Into a pocket made from this composite material a silastic ring is inserted before wetting the sponge with tap water and inserting it into the upper vault of the vagina to cover the cervix in a similar manner to the standard diaphragm.
Inventors
👤 Milos Chvapil
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-23 12:15
CPC Classifications
A; A61; A61F; A61F6/00; A61F6/06; A61F6/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
145 words
Formation of a contraceptive sponge bilayer product consisting of: (a) two layers of sponges having the shape of a circular disc, the diameter of about 5 to 11 cm and of the thickness of about 0.15 to 0.3 cm (b) the said sponges, laminated on one side with a thin plastic membrane attached to the sponge surface by an adhesive (c) connecting the two laminated sponges together at the circumference of the discs to form a pocket having the plastic membrane inside, the sponge layer outside and leaving an opening into the pocket about 3 to 4 cm wide (d) incorporating into the sponge an effective spermicide dissolved in a buffered solution of pH 3 to 5 (e) the said solution containing 5 to 20 volume percent glycerin or similar plasticizers and (f) inserting into the pocket of the laminated sponge bilayer a silastic ring
Claim 2
Dependent Claim
145 words
Formation of a contraceptive sponge bilayer product consisting of: (a) two layers of sponges having the shape of a circular disc, the diameter of about 5 to 11 cm and of the thickness of about 0.15 to 0.3 cm (b) the said sponges, laminated on one side with a thin plastic membrane attached to the sponge surface by an adhesive (c) connecting the two laminated sponges together at the circumference of the discs to form a pocket having the plastic membrane inside, the sponge layer outside and leaving an opening into the pocket about 3 to 4 cm wide (d) incorporating into the sponge an effective spermicide dissolved in a buffered solution of pH 3 to 5 (e) the said solution containing 5 to 20 volume percent glycerin or similar plasticizers and (f) inserting into the pocket of the laminated sponge bilayer a silastic ring
Claim 3
Dependent Claim
37 words
As under claim 1, where the sponge layer is formed by any polymers such as collagen, polyvinylalcohol, polyurethane, acetylcellulose and the like, forming a three dimensional matrix characterized by high resilience, large fluid absorbency and fast wetting.