Surgery – Male reproductory tract shields or birth control devices – Condoms
Patent
1989-12-22
1991-09-24
Hafer, Robert A.
Surgery
Male reproductory tract shields or birth control devices
Condoms
128842, 604347, A61F 1300
Patent
active
050506196
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a male contraceptive device.
The normal thin rubber sheaths, known as condoms, suffer from a number of disadvantages: (1 ) they sometimes break in use, (2 ) the Aids virus is 1000 times smaller than sperm, so, for this reason too, they do not provide a particularly secure barrier against disease, (3 ) they cover the penile surface with an immobile protective layer which some people find deadens most of the pleasurable stroking sensations associated with intercourse, (4 ) condoms do not enhance the pleasures of non-penetrative sex.
Although modifying a standard condom by increasing the thickness of the rubber would mitigate problems (1 ) and (2 ), it would exacerbate the problem of (3 ), and thus it would not be acceptable to many people. A condom serves no useful function (except disease prevention) during non-penetrative sex.
According to the invention there is provided a male contraceptive device comprising an inner sheath and an outer sheath within which the inner sheath fits, the sheaths being generally cylindrical in shape and substantially self-supporting, the outer sheath being closed at one end and open at the other and the inner sheath being open at the end corresponding to the open end of the outer sheath and closed at the other end except for one or more apertures, the sheaths being such that air is allowed to pass to and from the inside of the inner sheath via the aperture or apertures and the gap between the sheaths. With this arrangement friction between the two sheaths prevents movement of one sheath relative to the other: movement of the penis sliding against the inner sheath gives the sensations of intercourse, while the outer sheath provides a barrier against infection. An important feature of the design is the air channel between the two sheaths which has been developed (empirically) so as to offer suitable resistance to insertion and also withdrawal of the penis from the sheath provided that the penis is matched in size to the sheath. The thickness of the internal sheath is important, since if the inner sheath were to collapse entirely it would, by closing on itself, from an air seal, and effectively prevent withdrawal.
Satisfactory operation of this device depends on the correct design decisions as to, for example rubber thickness of both sheaths, and corrugations to maintain the right air flow between the sheaths (which must continue during all conditions of use).
Although the invention is intended primarily for use as a protective device during penetrative intercourse, it lends itself to the situation where the woman is suffering from vaginismus, thrush, or any other condition which precludes penetration, since with the invention non-penetrative use affords the male most of the sensations associated with penetrative intercourse: the reason that this is so is largely that the sheaths collapse during withdrawal, and so provide the stroking sensations associated with unprotected intercourse.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which:
FIG. 1 shows a mid point longtitudinal cross-section through the double-sheath;
FIG. 2 shows a mid point transverse cross-section through the double-sheath to a larger scale than that of FIG. 1; and
FIG. 3 shows a drawing of the device being tested with a test probe.
Referring to FIGS. 1 and 2 there is shown a contraceptive device comprising an outer sheath 1 of elastomeric material, preferably natural or synthetic rubber of about 1mm thickness. Sheath 1 is closed at one end 2 and open at the other end 3.
An inner sheath 4 of the same material is also of substantially cylindrical shape and fits within the outer sheath to be slidable with respect thereto for cleaning and assembly purposes, being designed to remain stationary during use. End 5 of sheath 4 is open and the other end has an air hole 6.
The inner surface of the inner sheath is relatively smooth to allow sliding within it whereas the outer surface of the inner sheath and both surfaces
REFERENCES:
patent: 2586674 (1952-02-01), Lonne
patent: 4009717 (1977-03-01), Allen
patent: 4961734 (1990-10-01), Kassman
Hafer Robert A.
Sam Charles H.
Usher Robert W. J.
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