AP49A

AP49A - Intrauterine contraceptive device.

Info

Publication number: AP49A
Application number: APAP/P/1987/000070A
Authority: AP
Inventors: Raisa Vladimirovna Gainutdinova; Vera Mitrofanovna Petrova; Alevtina Ivanovna Blokhina; Boris Samuilovich Fridman; Pinkhos Usherovich Gamer
Original assignee: Nauchno Proizvodstvennoe Obiedinenie Medinstrument
Priority date: 1987-10-06
Filing date: 1987-10-06
Publication date: 1989-09-04
Also published as: AP8700070A0

Abstract

An intrauterine contraceptive device, comprising a strip (1)with rounded-off ends, a rod (2)connected to the strip (1)to form a t-shaped element therewith, a fixing element (3)adapted to retain the entire device in the uterine cavity (4)and shaped as an elastic loop, and a coil (5)fitted over the rod (2), the elastic loop of the fixing element (3)having an arc-shaped base (6)and two elastic arms (7)connected to the base and held to the strip (1)at the base of the rod (2)and the strip (1)and encompasses the rod (2)

Description

INTRAUTERINE CONTRACEPTIVE DEVICE Field of the Invention

This invention relates generally to contraceptive devices and more specifically, to intrauterine devices (1UD).

Background of the Invention

One state-of-the-art intrauterine device (cf. GB,B, 1,456,746) is Known to be made as a T-shaped element, comprising a rod and two elastic arms branching off radially therefrom, and an elastic loop provided at its end. The arms are equally curved, the radius of curvature of each arm being adequately large, while the angle between the rod and each of the arms is less than 90 degrees.

'The prior-art device is characterized by the fact that an inadequately intimate contact between the arms of the device and the mucous membrane of the uterine fundus affects adversely the contraceptive effect, while insufficient elasticity and size of the loop are liable to inflict trauma and irritate the mucosa of the internal uterine orifice and hence spontaneous expulsion of the device.

Another prior-art intrauterine device, i.e., Nova T Cu200Ag (A/0 Huhtamaki, leiras, Finland) is known to comprise a rod with a copper coil, a strip with the rounded-off ends, held to tne rod so as form a 'T-shaped element therewith, and a fixing element to retain the entire device within the uterine cavity, said fixing element being in fact an elastic loop located at the rod end. .

Tne aforesaid prior-art device is characterized by the fact that provision of the elastic loop at the rod end, tne loop size and shape fail to provide constant pressing

ΔΡ 0 0 0 0 4 9 bad ORIGINAL

- 'd strip against tne mucous membrane of tne uterine i'unaus, ..hich is the cause of impaired contraceptive effect.

On tne other hand the base of the elastic loop irritates the receptors of tne mucosa in the region of the internal uterine orifice, provokes extraordinary contractions of the uterine muscle and promotes expulsion of the entire device.

In addition, the devices discussed above should have various sizes and shapes to suite the various sizes and shapes of the uterine cavity.

Nummary of the Invention

The invention has for its primary and essential object to proviae an intrauteral contraceptive device of a single type and size, chat would be applicable for the various sizes, shapes and positions of the uterine cavity due to improvements in the construction of the fixing element.

The aforesaid object is accomplished due to the fact ctiat in an intrauterine contraceptive device, comprising a strip with the rounded-off ends, a rod connected to tne strip to form a T-shaped element, a fixing element adapted to retain the entire aevice in the uterine cavity and shaped as an elastic loop, and a coil fitted on tilt rod, according to the invention, the elastic loop of the fixing element has an arc-shaped base and two elastic arms Conner »;<..· thereto and held to the strip at the base of the rod, said loop being coplanar with the rod and strip, and encompassing the rod.

It is also expedient that in the intrauterine contraceptiv device of the invention the ar-shaped base of the elastic

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loop have a thickened portion aimed at establishing a support located over the uterine cervix.

The intrauterine contraceptive device carried into effect in a way described above, provides for a constant pressing of the strip against the mucous membrane of the uterine fundus in an uterus of any size, shape and position, this being due to springiness of the fixing element consisting of a thickened arc-shaped base and elastic arms. All this makes it possible to attain the high contraceptive effect.

Apart from that, the construction of the fixing element, that is, the thickened arc-shaped base of the elastic loop prevents the device from penetrating into the region of the internal uterine orifice and is situated above thgt region so as not to inflict trauma upon the mucosal receptors and hence to ensure against expulsion of the entire aevice.

Brief Description of the Drawings

In what follows the invention will become more apparent from consideration of a specific embodiment thereof with reference to the accompanying drawings, wherein:

FIG. 1 is a general schematic view of an intrauterine contraceptive device, according to the invention;

FIG. 2 is a view of the intrauterine device of FIG. 1 wnen inserted into the cavity of a uterus having the normal shape and size, the so-called ideal variant, according to the invention;

FIG. 3 shows the intrauterine device of FIG. 1 when inserted into the cavity of a uterus featuring an increased

AP 0 0 0 0 4 9 transversal dimensions, according to the invention; and

FIG. 4 illustrates the intrauterine device of FIG. 1 *

when inserted into the cavity of a uterus having an increased longitudinal dimension and an irregular shape, according to the invention. '

Detailed Description of the Invention

The intrauterine contraceptive device of the invention comprises a strip 1 (FIGS 1, 2) having rounded-off ends, a rod 2 connected to the strip 1 so as to establish a T-shaped element therewith, a fixing element 3 adapted to retain the entire device in a uterine cavity 4 and shaped as an elastic loop, and a coil > fitted over the rod 2. I'ne elastic

J loop of the fixing element 3 has an arc-shaped base 6 having a ’ t thickened portion, and two elastic arms 7 connectec to the base 6 and held to the strip 1 at the base of tne rod 2. The elastic loop of the fixing element 3 is coplanar with the rod 2 and the strip 1, and encompasses the rod 2.

The intrauterine contraceptive device of the invention is to be inserted into the uterine cavity 4 (FIG. 2) through a cervical canal 8 of the uterus with the aid of a special syringe (omitted in the Drawing), and is so positioned that the strip 1 be in contact with a mpcous embrane 9 of the uterine fundus, whereas the arc-shaped tnickened base 6 of the fixing element 3 should rest

I · against uterine walls 10 an adequate distance from.the region of a uterine cervix 11. whenever the intrauterine device has to be inserted into the uterine cavity, featuring an increased transversal dimension, i.e., a shortened uter'>ne body (FIG. 3)» the fixing element 3 gets shortened under the action of the spring effect thereof, thus keeping the strip 1 in an intimate contact with the mucous membrane 9 of the uterine fundus.

Whenever the intrauterine device has to be inserted into the uterine cavity 4 featuring an elongated body and irregular shape (FIG. 4), the fixing element 3 becomes elongated under the action of the spring effect and assumes the irregular shape to suit that of the uterus involved.

As a result, the strip 1 is tightly pressed to the mucous membrane 9 of tne uterine fundus.

Proceeding from all described above the aforedisclosed intrauterine device may be considered as versatile and producing an adequate contraceptive effect so that a single size and type is equally applicable in diversely shooed, sized and positioned uteri.

Better contraceptive effect is attained in the aforesaid device due to the spring action produced by the firing element 3. As a result, the strip 1 of the device is in a constant intimate contact with the mucosa 9 of the uterine funaus, thus exerting a mechanical action on the uterus .

The tnickened arc-shaped base 6 of tne elastic firingelement 3 contributes to reliable fixation of the intrauteral device in the uterine cavity 4 above the uterine cervix 11 thus preventing the device from expulsion.

Claims

1. An intrauterine contraceptive device, comprising a strip (1) with rounded-off ends, a rod (2) connected to the strip (1) to form a T-shaped element therewith, a fixing element (3) adapted to retain the entire device in a uterinecavity (4-) and shaped as an elastic loop, and a coil (5) fitted over the rod (2), characterized in that the elastic floop of the fixing element (3) has an arc-shaped base (δ) and two elastic arms (?) connected to the base <6) and held to the strip (1) at the base of the rod (2), said loop being coplanar with the rod (2) and the strip (l) and encompassing the rod (2).

2. An intrauterine contraceptive device as claimed characterized in that uhe arc-shaped the elastic loop has a thickened portion to support above a uterine cervix (11).