Surgery – Female reproductory tract shields – supports – or birth... – With contraceptive – spermacidal – or antifertility agent
Patent
1992-09-16
1995-05-23
Hafer, Robert A.
Surgery
Female reproductory tract shields, supports, or birth...
With contraceptive, spermacidal, or antifertility agent
128839, A61F 546
Patent
active
054172233
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method for fabricating intra-uterine contraceptives.
Currently there are two kinds of copper-plastic spirals. One kind is formed of a contiguous shaft component and of a laterally outward extending crosswise component. The spiral component consists of copper wire wound around the elongated shaft component. The said method of fabrication is disadvantageous because the spiral component has to be separately wound over the shaft component. In addition, the copper wire spiral in the known solutions has been wound around the entire elongated shaft component in which cases, as is known, the copper around the base of the elongated shaft component does not possess an effective influence. The other kind of copper-plastic spirals have been designed to be such that their copper wire spiral extends only as far as the shaft component's upper half. This kind of a contraceptive is constructed in such a manner that the shaft component and the crosswise component are separate. The lower part of the shaft component is thicker than the upper part around which the copper wire spiral has been placed prior to assembling the contraceptive. In this way, the lower part of the shaft component and the union between the shaft component and the crosswise component hold the copper wire spiral in place. The latter kind of spiral is described in the FI patent publication 59719.
One disadvantage of the contraceptive in accordance with the said FI patent publication is that there is a connection between the shaft component and the crosswise component which, on the one hand, is difficult to implement and, on the other hand, may be susceptible to strain owing to its thinness. The arched locking component constitutes a protrusion which may be a cause of pain in the uterus. The design in accordance with the second implementation in the FI publication is intended to remedy this. The said solution does, however, make the crosswise component more complex in form.
The purpose of this invention is to provide an improvement to the above said disadvantages. This improvement is characterized in the main that the elongated component is essentially of equal diameter throughout its length and the crosswise component lateral to the elongated component and attached to it by its midpoint are formed into a single uniform piece and that a separate copper wire spiral is placed over the elongated component via its unobstructed end, whereafter a sleeve is then attached to support the copper wire spiral.
The main advantage of the invention is that it eliminates the need for the head required for the snap-on union between the crosswise component and the shaft component. As a result of this, the external diameter of the elongated component can be reduced, thereby enabling the diameter of the copper wire to be increased.
We shall now go on to describe the invention with references being made to the accompanying drawing, of which:
FIG. 1 is a side view of the elongated component and the crosswise oriented component.
FIG. 2 is a side view like FIG. 1, but with the spiral included;
FIG. 3 is side view like FIG. 1, but with a sleeve included on the elongated- and crosswise components, the said sleeve having a hole bored into it for the purpose of attaching the sleeve to the elongated component .
With reference to FIG. 1, we shall now go on to describe the invention. In FIG. 1, 1 is the crosswise component, 2 is the elongated lengthwise component. In accordance with the method, the lengthwise and crosswise components, the said components constituting a contiguous piece, are fabricated first. The crosswise component is formed to be curved at both ends. The contiguous piece is formed in such a manner as to eliminate the occurrence of any sharp points or edges.
FIG. 2 shows the copper wire spiral, indicated by reference number 3, which is attached around the upper part of the lengthwise component. This spiral has been made into a spiral-like structure by means known to craftsmen. The thickness of the copper wire is that commonly used; e.g. 0.5 mm.
REFERENCES:
patent: 4198966 (1980-04-01), Kaivola
patent: 4553536 (1985-11-01), Chiozza
patent: 4562835 (1986-01-01), Anderson
patent: 4628924 (1986-12-01), Cimber
patent: 4715365 (1987-12-01), Cimber
patent: 4775149 (1988-10-01), Wilson
Population Reports, Series B, No. 2, Jan. 1975.
Population Reports, Series B, No. 3, May 1979.
Aarnio Ari
Heinonen Keijo
Hafer Robert A.
Kenealy David J.
KMS MYYNTI
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