CN1027132C - Flexible metal contraceptive device - Google Patents

Abstract

The present invention relates to a flexible metal contraceptive device. The present invention is formed by sheathing a thin spiral pipe segment and a thick spiral pipe segment, which are made of wound stainless steel wires. Both ends of the thin spiral pipe segment can be provided with head hammers, and the sheathing length of the two pipes can be changed with the pressure and the shape of a uterine cavity; therefore, the diameter of the contraceptive device is changed, and the maximum central angle of the change of the diameter can reach 52 DEG. Before the present invention is placed into a uterus, the size of the uterus must be measured in advance. The present invention is suitable for shapes of uteri of different women and the shape of a uterus of the same woman in different breeding periods, and the present invention has stable chemical performance and is easy to sterilize and recheck with diagnoses.

Description

Flexible metal contraceptive device

The present invention relates to a kind of intrauterine device, especially a kind of endless metal intrauterine device.

Intrauterine device is a kind of contraceptive device that the married women of child-bearing age in countries in the world extensively adopt.Though it is more safe and reliable, but still exists pregnancy with IUD in situ, come off, infect, bore a hole and get side effect such as device because of disease.And the main cause that this this side effect takes place is that the design of birth control apparatus does not adapt to the different growth stage uterine cavity and changes and women's cavity of uterus individual variation.For example, the uterine cavity geometric shape can change with menstrual cycle.Loosen wide and short no autonomy at the menstrual phase isthmus.At this moment, then initiatively shrink the bottom, palace; Ovulation back isthmus becomes narrow, elongation and high-tension, and loosen the bottom, palace; Especially with menstrual period, easily make the birth control apparatus compressive deformation, displacement downwards or discharge and lose the birth control function.When if the geometry of birth control apparatus and uterine cavity is incompatible, then can stay in isthmus uteri or be displaced downwardly in the cervical canal, not only easily make endometrial impairment, also can make the uterus muscle overextension and produce hemorrhage even the perforation of uterus.Birth control apparatus easily triggers uterine contraction birth control apparatus is discharged the stimulation of isthmus uteri, and moving down of birth control apparatus also can be because of the hollow gestation that takes place in bottom, palace.And for example, the calibration of women breast-feeding their children's uterine cavity is often little, puts behind the device when the uterus returns to normal size, and birth control apparatus just moves down or comes off.So, in order to improve contraceptive effect, reduce complication, the problem that must consider when the size of birth control apparatus, function adaptability and resemblance are design always.In order to adapt to the cavity of uterus of different sizes, prepare the birth control apparatus of various different sizes by needs.For example, single steel intrauterine device just according to its external diameter be divided into 18,20,21,22,23, six kinds of models such as 24mm, need accurately to measure earlier the uterine cavity size when women puts device to select corresponding ring number.In order to make birth control apparatus can adapt to the cyclically-varying of uterine cavity shape, the size of device preferably has the cyclically-varying of automatic adaptation uterine cavity shape, and especially transverse diameter should have the ability of respective change.But general intrauterine device, particularly single steel intrauterine device birth control apparatus, its outside dimension usually lacks this self-reacting ability once selected after being placed into uterine cavity.Introduced a kind of intrauterine device that be fit to any uterus of Merchant RN the 105th page of 1987 " foreign medical science family planning fascicle " 61 phase of volume in development in 1985, it is the ring of being made by polyphenyl alkene, twine copper wire on it, have overlapping its transverse diameter that makes to obtain certain adjusting at the end of cavity of uterus medium ring.But this birth control apparatus still needs accurately to measure the uterine cavity size in advance before placement, selects for use by number type then, and its transverse diameter range of accommodation is also smaller.

The objective of the invention is to invent the another kind of intrauterine device that is fit to any uterus, it need not to measure in advance uterus size (deformity and particular size uterus exception) before inserting the uterus, and regulates the uterine cavity shape of intrauterine device Zhou Jing with different sizes of automatic adaptation and different growth stage by the structural feature that birth control apparatus itself is had.

Invention main points of the present invention are that it is that the pinion head pipeline section (1) that formed by the stainless steel silk coiling and thin pigtail (2) are through cover poststack looping.The internal diameter of pinion head pipeline section can be slightly larger than the external diameter of thin pigtail, after thin pigtail is inserted in pinion head pipeline section cavity, has formed " core " relation with " sheath " between the two.Change with ambient pressure because of leaving the thin screwed pipe segment length that the ample clearance can make intussusception go in the pinion head pipeline section between the two, i.e. " core ", " sheath " healing held together, the week footpath of flexible metal contraceptive device is littler, otherwise then bigger, the excursion maximum of its central angle can reach about 52 °.Be unlikely separation in order to guarantee two pipe boxes to build up annular, the present invention can be provided with head hammer (3) respectively at the two ends place of thin pigtail, and the external diameter of head hammer can be slightly less than the internal diameter of pinion head pipeline section greater than the external diameter of thin pigtail.The two ends broken end of pinion head pipeline section should be in the inner edge of ring.

Figure 1 shows that sketch map of the present invention;

Figure 2 shows that fragmentary, perspective view of the present invention.

The present invention does not contact with uterine mucosa because pinion head pipeline section two ends broken end is in the inner edge of ring in use, therefore can not damage uterine cancer cell.The present invention can be big with the easypro automatic uterine cavity and the excursion that directly adapt to variation birth control apparatus week of regulating that contract of uterus muscle, the metal intrauterine device that therefore can replace multiple model, not needing to measure in advance the big I of uterine cavity directly places, can be adapted to different individualities, also can be adapted to of the change of same individuality in different growth stage uterine cavity shape size.Simultaneously, it is stable that the present invention also has the materials chemistry performance, not perishable, harmless in human body, is convenient to sterilization (available various medicining liquid dippings, boil or steam autoclave sterilization etc.), with examining advantages such as check is easy.

On basis of the present invention, also can in serpentine pipe, place the steroid hormone that trace discharges or on serpentine pipe, add can copper ion releasing micro-copper wire further improve contraceptive effect.

Below specifically describe manufacture method of the present invention by a most preferred embodiment.In the present embodiment, in order to adapt to China's most of women of child-bearing age's uterine cavity size, design week of the present invention footpath adjustable extent with 21-24mm single steel intrauterine device size.In the present embodiment, said serpentine pipe can be formed by the coiling way coiling of 1Cr18Ni9Ti acid-resistant stainless steel silk with reference to the single steel intrauterine device birth control apparatus, the Steel Wire Surface roughness value can be not more than 0.2 μ m, and steel wire diameter can be 0.3 ± 0.0125mm, and the steel wire deviation from circular from can be no more than 0.005mm.Pinion head pipeline section external diameter can be about 2mm during coiling, and thin pigtail external diameter can be about 0.5mm.Two length of tube ratio is about 5: 1, and promptly when the pinion head length of pipe section was 70mm, then thin spiral shell moved pipeline section (comprising the two ends hammer) length and is about 14mm.The head hammer at two ends can be ellipse, and its major diameter can be taken as 1.4mm, and after hammer was inserted in pinion head cover section right overhead, this pipeline section diameter may slightly be contracted to about 1.9mm.The serpentine pipe termination should be treated to smooth surface, and camber is gentle and not sharp keen, and particularly when the present invention inserted the uterus ringwise, two end points broken ends of pinion head pipeline section should guarantee to be in the inner edge of ring.Surface of the present invention should be smooth, do not allow defectives such as crackle, scabbing, burr, and coiling should be smooth, and helix is closely arranged in one plane.The flexible metal contraceptive device of coiling like this, its in week the footpath can between 21～24mm, freely stretch, its variation central angle maximum can reach 52 °.

Claims (5)

1, a kind of flexible metal contraceptive device, can form by the stainless steel silk coiling, it is characterized in that it can go into pinion head pipeline section (1) by thin pigtail (2) intussusception and constitute, head hammer (3) can be set, can change birth control apparatus week footpath size by regulating two pipeline section intussusception length at thin pigtail two ends.

2, birth control apparatus as claimed in claim 1 is characterized in that the described pinion head length of pipe section and the ratio of thin pigtail length (comprising the head hammer) can be about 5: 1.

3, birth control apparatus as claimed in claim 1 is characterized in that its week, directly changing the central angle maximum can reach 52 °.

4, birth control apparatus as claimed in claim 1, when it is characterized in that described birth control apparatus ringwise, two end points broken ends of pinion head pipeline section should be in the inner edge of ring.

5, birth control apparatus as claimed in claim 1 is characterized in that placing the steroid hormone of trace release or add micro-copper wire on serpentine pipe in serpentine pipe.

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