Surgery – Truss – Perineal
Patent
1981-01-04
1982-12-28
Millin, V.
Surgery
Truss
Perineal
128334R, 128130, A61M 3100
Patent
active
043656218
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for the temporary or permanent closing of body passages or cavities in humans and animals and comprising a member of a material which swells at least 20% by absorbing body fluids and which is substantially inert to body fluids and surrounding tissues, the member being dimensioned so as to be able to be introduced with clearance into the passage or the cavity in its unswollen state but to take up the whole cross-section of the passage or cavity in the swollen state and then to be held firmly by pressure against the surrounding wall of the passage or cavity.
BACKGROUND
The closing of body passages by means of members which can swell has previously been proposed. Such closing of passages and cavities in human or animal bodies may be justified for contraceptive reasons, in which case the oviducts or testicular ducts are closed, or for reasons of illness which require a blocking of a body passage.
The expansible member in question was previously made of fibrous substances which swell on absorbing body fluid, but later it was found that suitable materials are certain water-absorbing copolymerized plastics, so-called hydrogels. The closing is effected in that the expansible member is inserted in the unswollen state in the body passage in question. The shape and dimensions of the member are adapted so that it can easily be introduced into the passage. After introduction, it absorbs fluid from the surrounding tissues and swells. By this means, the passage is blocked as intended while at the same time the member obtains a firm hold therein. Nevertheless, the material should be substantially inert with respect to the body fluid and the surrounding tissues so that the member is retained intact and can be removed when it has served its purpose. As a result, the functioning of oviducts or testicular ducts can be restored, for example, after being blocked with a preventive aim.
TECHNICAL PROBLEM
It has been found, in practice, however, that there is a risk of the member being carried out of the passage, for example by muscular movement or being flushed away during the first period of time after insertion when it has not been able to absorb so much body fluid that it has assumed such a size that it presses against the surrounding walls of the passage. It is also conceivable in some connections that such an expansion of the cavity can occur, that the volume of the member is no longer sufficient and there is a risk of expulsion.
THE SOLUTION
According to the invention, the device also comprises elements with external portions which, in the unswollen state of the member, project out from its surface and which are made of a material with such suitable stiffness that the element with said external portions spreads out in a flexible manner towards the surrounding walls of the passage or cavity in such a manner that the element tends to lock the member in its inserted position by pressure against the wall.
ADVANTAGES
This affords a securing of the member before it has developed any direct pressure against the surrounding wall through its swelling and so eliminates said risk of expulsion. This is effected by simple means and in such a manner that the member, in its normal swollen state, performs its normal function of blocking the passage without any particular disadvantages.
BRIEF DESCRIPTION OF DRAWINGS
In the accompanying drawings, two forms of embodiment of a member constructed according to the invention are shown as well as four forms of embodiment of an element included in the device according to the invention.
FIG. 1 shows, in longitudinal section, the member according to the first form of embodiment;
FIG. 2 shows the same member in cross-section;
FIG. 3 shows the member according to the second form of embodiment, in longitudinal section;
FIG. 4 shows an element included in the member in one form of embodiment and
FIG. 5 shows the element in another form of embodiment.
BEST MODE OF CARRYING OUT THE INVENTION
As stated, the device according to the
REFERENCES:
patent: 2616424 (1952-11-01), Brown et al.
patent: 3687129 (1972-08-01), Nuwayser
patent: 3888975 (1975-06-01), Ramwell
patent: 3918443 (1975-11-01), Vennard et al.
AB Medline
Millin V.
Swisher Nancy A. B.
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