JPH0349703Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a catheter set for in vitro fertilization such as embryo transfer.

Conventional technology Two treatments for infertility patients include in vitro fertilization, which involves culturing eggs taken from the ovaries, mixing them with sperm, fertilizing them, and then returning them to the uterus for implantation. The so-called gift method is known, in which the embryo is returned to the tube and fertilization and implantation occur naturally.

Conventionally, when performing these treatments,
A catheter consisting of a Teflon tube is used.

Problems that the invention aims to solve By the way, in the case of catheters made of Teflon tubes, the tubes are not flexible, so when returning fertilized embryos to the uterus, the endometrium is often damaged. The problem was that the success rate was extremely low. Another problem was that it was not easy to insert the catheter into the uterus, and it took a long time to insert it.

Therefore, the purpose of this invention is to solve the problems of the conventional catheters and provide an in vitro fertilization catheter set that does not damage the endometrium and can be inserted quickly and easily. do.

Means for Solving the Problems In order to achieve the above object, an in vitro fertilization catheter set according to the present invention consists of a silicone rubber tube, as shown in Figs. A catheter 1 having a hole 2 large enough to be inserted and removed;
It is characterized by comprising an outer cylinder 6 into which the catheter 1 is slidably inserted and guided.

Further, in the catheter set, a stopper 7 may be provided on the front end side of the outer cylinder 6, and a space 8 for sliding the catheter may be formed in the outer cylinder 6 on the rear end side of the stopper 7.

Effects and Examples To return a fertilized embryo to the uterus from, for example, a shear dish, connect the syringe of a syringe (not shown) to the catheter 1 inserted into the outer tube 6, and add the contents of the embryo, which has been taken out in advance into a shear dish, etc. The embryo along with the internal fluid is aspirated through the hole 2 of the catheter 1 whose front end protrudes from the outer tube 6. After suction, the front end of the catheter 1 is retracted into the outer tube 6, and then inserted into the uterus together with the outer tube 6 as shown in FIG. When the catheter 1 and the outer tube 6 have been inserted to a predetermined position in the uterus, the catheter 1 protruding from the rear end opening of the outer tube 6 is inserted by sliding it forward using the outer tube as a guide. The front end of the outer cylinder 6 is positioned deeper into the uterus than the front end of the outer cylinder 6. When the front end of the catheter 1 reaches an appropriate position within the uterus 2 as shown in the figure, the embryo is transferred through the hole 2 along with the internal fluid using a syringe of a syringe connected to the rear end of the catheter 1. Push it out into the uterus.

If the outer tube 6 is provided with a stopper 7, when inserting the catheter 1 into the uterus,
The stopper 7 is brought into contact with the cervical region B of the uterus A. Therefore, the insertion position of the outer tube 6 inserted together with the catheter 1 (the predetermined position of the catheter in the uterus) can be easily positioned. Also, a space 8 formed in the outer cylinder 6 on the rear end side of the stopper 7
Since a portion of the catheter 1 emerges from the opening, it is possible to insert the exposed catheter 1 by grasping it with tweezers, for example, and sliding it forward.
Therefore, in this case, since the insertion position is closer to the front end of the catheter 1 than when inserting the catheter 1 protruding from the rear end opening of the outer tube 6 as described above, the insertion is easier and the front end can be quickly brought to any location within the uterus.

Regarding the insertion of the catheter 1, in this embodiment, as shown in FIG. 3A, the catheter 1 is provided with markings 3 and scales 4 over a predetermined length,
The catheter 1 is inserted from the catheter sliding space 8 of the outer tube 6 by being pinched with tweezers so that the length of the catheter 1 inserted can be visually checked.

Hole 2 provided at the front end of the catheter 1
As shown in Fig. 3B, the opening is an expanded circle that is formed without a step from the front end closure part 1a and curved from the inside to the outside so that the embryo etc. can enter and exit smoothly without getting caught. It is a hole. In the embodiment, a total of two holes 2 are provided at opposing positions, but two holes 2 are not necessarily required, and may be one or three or more. In the case of one piece, it may be formed by opening the front end closing portion 1a. Furthermore, the expanded shape may not be curved as shown in the figure, but may be tapered or may have the same diameter. In FIG. 1, 5 is a connector to which a syringe of a syringe is connected.

There are no particular restrictions on the material of the outer tube 6, but since it is necessary to guide the catheter 1 and requires more rigidity than this, for example, fluorine resin, nylon, PE, etc.
PP, PET, PU, PVC, EVA, metal are preferred. In order to make the catheter 1 easier to use and to facilitate insertion of the catheter 1, the rear end side is formed to be slightly upwardly tapered when viewed from the side as shown in FIG. Further, as shown in FIG. 2, the catheter sliding space 8 of the outer cylinder 6 is constructed by arranging the two outer cylinders 6 at a predetermined interval, and extending the sub-lumen 11 of each of the two outer cylinders 6 to a certain length. This can be obtained by inserting a metal rod 10 made of stainless steel or the like and fixing it in a straight line, and joining both outer cylinders 6 while maintaining the above-mentioned distance. In the figure, 15 indicates a main lumen through which the catheter 1 slides. However, this design is also an example, and it goes without saying that other means may be used.

The front end opening edge of the outer cylinder 6 is rounded or tapered 12.
It is attached so that it does not damage the endometrium when inserted into the uterus. Further, an expanded insertion port 13 is provided at the rear end opening of the outer tube 6, and the catheter 1 can be inserted into the outer tube 6 through the insertion port 13.
It has become easier to do so through .

In the above embodiment, an example of use was explained in which a fertilized embryo is transferred, but it can also be used in the same way when an egg taken out from an ovary is mixed with sperm and then returned to the fallopian tube.

Effects of the invention This invention is as described above, and since the catheter is made of a flexible silicone rubber tube, the conventional problem of damage to the endometrium can be reliably eliminated, and as a result, the catheter can be placed outside the body. The success rate of fertilization can be made higher than before. In addition, when inserting a catheter made of this flexible silicone rubber tube, the outer tube is used as a guide, which eliminates the difficulty of insertion due to flexibility, allowing easy and quick insertion. . In the case of claim 2, when the catheter is inserted using the outer tube as a guide, both the insertion positions of the outer tube and the front end of the catheter can be positioned by the stopper, and the catheter insertion operation is prevented by the space. It has the excellent effect of being extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a side view of a catheter set showing an embodiment of this invention, FIG.
FIG. 3A is an enlarged plan view with a portion of the above catheter omitted, FIG. 3B is a cross-sectional plan view thereof, and FIG. 4 is a drawing for explaining the operation. 1...catheter, 2...hole, 6...outer tube, 7
...Stoppa, 8...Space part.

Claims (1)

[Claims for Utility Model Registration] 1. A catheter made of a silicone rubber tube and having a hole at its front end large enough to allow an egg or fertilized embryo to enter and exit, and a catheter that is shorter in length than this catheter and has open front and rear ends. 1. A catheter set for in vitro fertilization, characterized by comprising an outer cylinder formed by a catheter into which a catheter is slidably inserted and guided. 2. The in vitro fertilization catheter set according to claim 1, wherein a stopper is provided on the front end side of the outer cylinder, and a space for sliding the catheter is formed in the outer cylinder on the rear end side of the stopper.