Contraceptive sheath with integrated bead construction
A female condom and an improved method for manufacturing a female condom is disclosed. The invention provides a device that is effective in both acting as a contraceptive and inhibiting the transmission of disease during coitus. The invention employs synthetic latex in an efficient and cost effect manufacturing method that results in an improved product.
1. A method for manufacturing a female condom comprising:
dipping a former into container of synthetic nitrile latex such that the synthetic nitrile latex forms a coating on the former, said coating defining a tubular wall with an open end and a closed end;
drying the coating on the former;
partially curing the coating on the former at least 95° C. for at least about 15 minutes;
after the partial curing, rolling the open end of the tubular wall upon itself to form an integral bead wherein the integral bead is of a diameter greater than that of the tubular wall; and
finally curing the coating after the integral bead is formed.
2. The method of claim 1 further comprising the step of inserting a retaining mechanism into the closed end of the tubular wall.
3. The method of claim 2 wherein the retaining mechanism comprises an elastic ring like member.
4. The method of claim 3 wherein the ring like member is made of polyurethane or similar elastomeric material.
5. The method of claim 3 wherein the ring like member is only a portion of a circle.
6. The method of claim 1 wherein the integral bead has a cross section diameter of greater than 3 mm.
7. The method of claim 1 wherein the integral bead consist of at least 130 mm of the tubular wall.
8. The method of claim 1 wherein adhesive material is applied to the outer portion tubular wall such that the bead is rolled over the adhesive and the adhesive material inhibits the bead from unrolling.
9. The method of claim 1 further comprising the steps of:
leaching the tubular wall after the drying step and before the cure and drying the tubular wall after the leaching step.
10. The method of claim 1 further comprising the steps of coating the former with a coagulant before dipping it into the synthetic nitrile latex and drying the former once coated with the coagulant.
11. The method of claim 10 wherein the coagulant is calcium nitrate.
12. The method of claim 1 wherein the former is preheated to at least about 70° C. before dipping it into the coagulant.