JPH02264653A - Catheter - Google Patents

Abstract

PURPOSE:To prevent the crushing of a catheter body at the time of insertion to a forceps plug or the buckling during the course of the insertion by providing a protective cylinder which is freely slidably fitted onto the part near the front end of the catheter body and prevents the deformation of the body against the pressure of the forceps plug. CONSTITUTION:While the part near the front end of the catheter body 2 is held covered by the protective cylinder 3, the catheter body 2 is press-fitted together with the protective cylinder 3 into tm slit of the forceps plug. A bulging part 6 and a small diameter part 7 can, therefore, be inserted into the channel of an endoscope without receiving the pressure of the forceps plug at the time when the catheter body 2 is passed into the slit of the forceps plug in this case. The crushing of the catheter body 2 by the forceps plug, the buckling of the small-diameter part 7, the jumping out of the precious fertilized eggs in the inside by the collapse of the bulging part 6, etc., are thereby surely prevented. Further, the buckling of the catheter body 2 during the course of the insertion is prevented as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a catheter inserted through a forceps plug of an endoscope.

[Prior Art] In recent years, catheters have been frequently used as a type of medical treatment tool. For example, one of the methods related to in vitro fertilization and egg transplantation.
One method is to insert a catheter transuterinely into the fallopian tube and inject the fertilized egg or semen directly into the fallopian tube.

This type of catheter is generally inserted endoscopically into a treated area such as the uterus. In this case, a channel is formed in the insertion portion of the endoscope into which a treatment tool such as forceps or a catheter is inserted. The distal end of this channel communicates with the opening for the treatment instrument at the distal end of the insertion section, and the proximal end opens into the channel opening of the operating section.

For example, a forceps stopper is attached to the channel opening to prevent bodily fluids from leaking out through the channel. This forceps plug is made of an elastic material such as rubber.

A slit for airtightly inserting a catheter is provided in the center of the forceps plug.

[Problem to be solved by the invention@] Incidentally, the human fallopian tube has a narrow lumen, and the opening to the uterine cavity (fallopian ostium) generally has a diameter of 1 m+m or less. Therefore, it goes without saying that it is desirable that catheters used for in vitro fertilization, egg transplantation, etc. have an outer diameter of 1 square inch or less.

However, when inserting a catheter into the fallopian tube under direct vision in combination with an endoscope, tubes with an outer diameter of 1 mm or less are too flexible and unsuitable for insertion into the channel of the endoscope. . That is, when inserting a catheter into a treatment instrument insertion channel of an endoscope, it is necessary to pass the catheter through a slit of a forceps plug attached to the opening of this channel.

In this case, the slit of the forceps plug is maintained in an airtight state between the walls on both sides of the slit by its own elasticity under normal conditions (when the treatment tool is not in use).

When the treatment instrument is used, the distal end of the treatment instrument is press-fitted between the walls on both sides of the slit, and is guided into the channel while expanding between the walls on both sides against the elasticity of the slit. Therefore, when a flexible catheter with an outer diameter of 1 mm or less is press-fitted into the slit of a forceps plug, the elasticity of the slit compresses the catheter between both side walls of the slit, crushing the catheter and blocking the lumen of the catheter. There was a risk that the person would be attacked.

Furthermore, when inserting a catheter into the treatment instrument insertion channel of an endoscope, the insertion resistance of the catheter increases due to the pressure force between the both side walls of the slit of the forceps plug, so the catheter may become seated during insertion. There was a risk that he would succumb.

This invention was made based on the above circumstances, and its purpose is to reliably prevent the catheter body from being crushed when the catheter body is inserted into the forceps plug of an endoscope. It is an object of the present invention to provide a catheter which can prevent buckling of the catheter body during insertion.

[Means for Solving the Problems] The present invention includes a cylindrical protective tube that prevents deformation of the catheter body and is slidable in the longitudinal direction near the tip of the catheter body inserted through the forceps plug of an endoscope. It is something that

[Operation] When inserting the catheter body into the forceps plug of an endoscope, the vicinity of the distal end of the catheter body is covered with a protective sleeve, and the catheter body is press-fitted together with this protective sleeve into the slit of the forceps plug. Preventing the catheter body from being crushed by the forceps plug, and further inserting the catheter body into the channel of the endoscope while keeping this protective tube press-fitted in the throat of the forceps plug. This prevents the catheter body from buckling during insertion.

[Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In this embodiment, the present invention is applied to a catheter 1 for gamete transplantation, and FIG. 1 is an overall view of the catheter 1. This catheter 1 includes a main body 2 made of a flexible tube that is inserted into the uterus, a protective sleeve 3 that is fitted onto the outside of the main body 2 and is slidable along the longitudinal direction, and this protective sleeve 3 is connected to the main body. A locking member 4 is attached to the main body 2 to restrict the slide of the main body 2 toward the distal end, and a locking member 4 is attached to the rear end of the main body 2 during suction and injection of gametes such as semen and eggs. It consists of a cap 5 for connecting a syringe.

An enlarged portion 6 for storing gametes is provided near the tip of the main body 2, and the inner and outer diameters of the enlarged portion 6 are larger than the other portions of the tube forming the main body 2.

A narrow diameter part 7 with an outer diameter of 1 ml and a length of 5 to 10 mm is provided on the distal end side of the enlarged part 6, which is suitable for insertion into the fallopian tube 20 shown in FIG. This narrow diameter portion 7 and the enlarged portion 6
The stepped portion 8 that forms the boundary between the two sides is inclined at a predetermined angle toward the enlarged portion 6 side. In addition, the tip of the narrow diameter portion 7 is connected to the fallopian tube 20.
The end face is rounded to prevent damage to the inner wall of the Further, the rear end side of the enlarged portion 6 is an operating tube portion 9 having a smaller diameter than the enlarged portion 6.

The protection tube 3 has an inner diameter on the distal end side larger than an outer diameter of the enlarged portion 6, and its axial length encompasses the narrow diameter portion 7 and the enlarged portion 6 of the main body 2. Furthermore, the inner diameter of the rear end side of the protection tube 3 is set to be approximately equal to the outer diameter of the operation tube section 9.

The resin used to form the main body 2 may be, for example, PTFE, polyurethane, silicone resin, polyethylene, vinyl chloride, or the like. Furthermore, the color of the resin is preferably transparent or translucent so that the liquid inside can be easily confirmed.

FIG. 2 is an overall view of an endoscope 10 used in combination with the catheter 1 described above. This endoscope 10 has an insertion section 11 in which a channel 12 is formed. This channel 12 has one end opened at the distal end of the insertion section 11 and the other end opened at the channel opening 13 of the operating section 10a.

A cock 14 having a T-shaped conduit is attached to the channel opening 13, and a CO2 injector 15 for expanding the uterine cavity 18 is connected to the side opening end of the cock 14. Further, the other opening of the cock 14 has a C.
A forceps plug 16 is attached to prevent O2 gas from leaking to the outside.

The forceps plug 16 is made of an elastic material such as rubber, and has a slit 17 in its center for airtightly inserting the catheter 1 therein.

In addition, in FIG. 6, 19 is the fallopian tube orifice.

Next, the case where the catheter 1 having the above structure is used will be explained. Mature eggs collected from follicles in advance are artificially inseminated outside the body, cultured for a certain period of time, and then sucked and stored in the ampulla 6 of the catheter 1 together with a culture solution. Note that when injecting the egg into the catheter 1,
In advance, a culture solution is injected from the tip of the catheter 1, and then an egg is injected, and the egg is securely positioned on the tip side (ampulla 6) of the catheter 1 so that it can be sent into the fallopian tube 20. .

Next, CO2 gas is supplied to the uterine cavity 18 to facilitate observation of the inside of the cavity, and after confirming the fallopian tube opening 19 under direct vision, the catheter body 2 is inserted into the channel 12. When inserting this catheter 1, the protective tube 3 is slid in advance to a position that covers the enlarged portion 6 and the narrow diameter portion 7. Then, place the vicinity of the distal end of the catheter body 2 into the protection tube 3.
The catheter main body 2 and the protective tube 3 are press-fitted into the slit 17 of the forceps plug 16 while being covered by the protective tube 3.

Therefore, in this case, the catheter body 2 is attached to the forceps plug 16.
When passing through the slit 17 of the endoscope, the enlarged portion 6 and the narrow diameter portion 7 can be inserted into the channel 12 of the endoscope without being compressed by the forceps plug 16.
It is possible to reliably prevent the catheter body 2 from being crushed by the forceps plug 16, buckling the narrow diameter portion 7, or crushing the ampulla 6 and causing the precious fertilized egg inside to escape, as in the conventional case. can.

Furthermore, while the protective tube 3 is held in the slot 17 of the forceps plug 16 in a press-fitted state, the catheter body 2 is
is inserted into the channel 12 of the endoscope 10. In this case, since the catheter main body 2 passes through the inside of the protective tube 3, the catheter main body 2 is not subjected to pressure from the forceps plug 16. Therefore, the insertion resistance of the catheter main body 2 can be significantly reduced compared to the conventional one, so that it is possible to prevent the catheter main body 2 from buckling during insertion.

After the enlarged portion 6 has passed through the slit 17, the protective tube 3 is slid toward the proximal side as shown in FIGS. It may be inserted into the channel 12 of the main body 2 while maintaining an airtight state.

Uterine cavity 18 through channel 12 as shown in FIG.
The main body 2 introduced into the tubal ostium 1 under observation with an endoscope 10
The narrow diameter portion 7 at the tip is inserted toward the tip 9. Once the stepped portion 8 is brought into close contact with the oviduct opening 19, the fertilized egg and culture solution stored in the ampullae 6 are removed from the uterine cavity by pushing and operating a syringe (not shown) attached to the cap 5. It can be injected into the fallopian tube 20 without leaking into the fallopian tube 18.

In the above embodiment, a case was described in which the catheter 1 is used for in vitro fertilization and egg transplantation, but the liquid injected into the fallopian tube 20 using the endoscope 10 can be used for infertility treatment of oligospermia. It may be semen for medical purposes or occluded substances in the fallopian tubes for contraceptive treatment.

Also, to expand the uterine cavity 18, physiological saline may be used instead of CO2 gas.

FIG. 7 shows a second practical example of the invention. This has a plurality of auxiliary liquid feeding holes 21 bored in the lumen side wall of the narrow diameter portion 7 of the main body 2.

In this way, when the distal end opening of the narrow diameter portion 7 is tightly closed with the folded inner membrane of the fallopian tube 20, the injection liquid can be injected from the auxiliary liquid feeding hole 21. 20 can be reliably injected.

FIG. 8 shows a third embodiment of the present invention, in which an O-ring 23 is attached to the sliding surface of the protection tube 3 and the operating tube section 9 of the main body 2.
In addition, a porous membrane 24 that allows liquid to pass through but not fertilized eggs is provided at the boundary between the lumen of the enlarged part 6 and the operating tube part 9.

In this way, when the protective tube 3 is inserted into the forceps plug 16, the expansion gas can be prevented from escaping to the outside through the gap between the main body 2 and the protective tube 3, and when the fertilized egg is aspirated, the expansion gas can be prevented from escaping to the outside. Since the eggs are reliably accumulated in the ampullae 6, the eggs can be delivered at the initial stage of injection and can reach the deep part of the fallopian tube 20. Therefore, there is no backflow from the fallopian tube opening 19, and the egg descends into the uterus after it has grown sufficiently, so a reliable tube bed can be expected.

[Effect of the invention] According to this invention, y1. A cylindrical protective tube that prevents deformation of the catheter body that is inserted through the endoscope's forceps plug is equipped with a cylindrical protective tube that can be slid freely in the longitudinal direction, so that the catheter body can be inserted into the endoscope's forceps plug. It is possible to reliably prevent the catheter body from being crushed when inserting the catheter body, and it is also possible to prevent buckling of the catheter body during insertion.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a catheter showing a first embodiment of the present invention, FIG. 2 is a schematic diagram of an endoscope, and FIGS.
The figures are explanatory diagrams sequentially showing the states when the catheter is inserted into the channel of the endoscope, Fig. 6 is an explanatory diagram of the state where the catheter is inserted into the fallopian tube, and Fig. 7 is the second diagram of the present invention. FIG. 8 is a sectional view of a catheter showing a third embodiment of the present invention. 2...Main body, 3...Protection tube, 1o...Endoscope, 1
6...forceps plug. Applicant's agent Patent attorney Jun Tsuboi Figure 2 Figure 5

Claims (1)

[Claims] a catheter body inserted through a forceps plug of an endoscope;
A catheter characterized in that it is comprised of a cylindrical protective tube that is slidably slidable in the longitudinal direction near the distal end of the main body and prevents the main body from being deformed by the pressure of the forceps plug.