JP3162023U - Catheter insertion aid - Google Patents

Abstract

An object of the present invention is to provide a semen-injection rod that can not only reduce the burden on an animal and safely inject semen, but also can improve the pregnancy rate. A hard outer tube 10 made of a resin material having both ends opened, a soft semen injection catheter 30 made of a resin material that is closed at one end and has a semen injection hole 31 on a side surface near the closed end, An intrauterine semen injector is composed of a hard inner layer tube 20 made of a resin material with one end blocked, and an outer diameter and a semen injection catheter 30 through which the outer diameter and inner diameter of the inner layer tube 20 can be inserted into the outer layer tube 10 can be inserted. As the inner diameter, an outlet 21 having an opening diameter through which the semen injection catheter 30 can be inserted is provided on the side surface near the closed end of the inner layer tube 20. [Selection] Figure 2

Description

  The present invention relates to an intrauterine semen injector for animals, particularly an intrauterine semen injector suitable for an animal having a uterine horn such as a dog, and a catheter insertion assisting device used for the injector.

  In recent years, many artificial inseminations have been performed in pets such as dogs. In order to obtain a high pregnancy rate and the number of offspring in artificial insemination using frozen semen, a technique for injecting semen into the uterus is indispensable. As a method for performing intrauterine injection, there are (1) a method using a rigid endoscope and (2) a method using a metal thin catheter (Norwegian catheter). A method using a rigid endoscope is a technique that is currently popular in Europe and the United States (see Non-Patent Document 1). However, a rigid endoscope is expensive and a thin metal rigid endoscope is used. In addition, there are drawbacks such as having to hold the dog firmly. The method using a metal thin catheter is a method of inserting a catheter into a uterus while holding a cervical canal of a dog through a body wall (see Non-Patent Document 2), and requires a highly skilled technique. Become. Not only that, but because the catheter is made of metal, there is a risk of piercing the uterus.

  Under such circumstances, Japanese Patent Application Laid-Open No. 2006-167093 describes a hollow cylindrical catheter having a distal end portion made of a soft material and a proximal end portion made of a hard material. This catheter is designed for pigs, and a plastically deformable core material such as a wire is embedded in the axial direction at the distal end of the catheter. In use, the distal end portion is inserted into the cervix while being bent at an appropriate angle. This catheter has no fear of perforating the uterus because the tip is made of a soft material. In addition, since a plastically deformable core material is embedded in the tip, the tip of the catheter can be bent at any angle to avoid contact with the swine in the cervix of the pig, and smoothly into the uterus A catheter can be inserted.

JP 2006-167093 A

Wilson MS. Vet Clin North Am Small Anim Pract, (2001) 31, 291-304 Linde-Forsberg C et al., Theriogenology, (1999) 52, 11-23

  By the way, the catheter of patent document 1 is produced on the assumption that it is used for pigs, and the distal end is bent at an appropriate angle while repeating trial and error according to the state of the heel present in the cervical canal of the pig. There is a need.

  However, in some animals such as dogs, the external uterine ostium, which is the opening on the cervical canal side, is slightly away from the deepest part of the vagina (blind end) to the ostium side, from above the heel. Opening diagonally downward. In order to obtain a high pregnancy rate, it is preferable to inject sperm into the vicinity of the uterine horn, that is, the uterine body or the uterine horn.

  When the catheter described in Patent Document 1 is used for such an animal, the following adverse effects can be considered. For example, if it is inserted into the vagina with the tip bent, the tip bend angle will not only contact the inner wall of the vagina but also the catheter will successfully enter the cervix from the external uterine ostium. Will be changed over and over, and catheter insertion and withdrawal will be repeated. For this reason, an excessive burden is imposed on the animal.

  Further, even if the catheter can be inserted from the external uterine ostium with the distal end bent, it is considered that the entire distal end is bent in an arc shape, so that it does not enter the uterine horn well from the uterine body.

  There is also a desire to enter the catheter using an endoscope if possible in order to allow the catheter to enter the uterine body or uterine horn from the outer uterine ostium without imposing an excessive burden on the animal.

  Under such circumstances, there has been a demand for a semen-injection rod that not only can reduce the burden on animals and can safely inject semen, but also can improve the pregnancy rate.

  The present invention has been made to solve the above-mentioned problems, and is a catheter insertion assisting device comprising a hard outer layer tube made of a resin material having both ends opened and a hard inner layer tube made of a resin material having at least one end opened. The outer diameter and inner diameter of the inner layer tube are the outer diameter that can be inserted into the outer layer tube and the inner diameter that can be inserted through the semen injection catheter, respectively, and the semen injection catheter can be exposed by being inclined with respect to the axis of the inner layer tube The drawn outlet is provided in the other end opening of the inner tube or in the vicinity of the other end opening.

  When the catheter insertion aid of the present invention is used, the semen injection catheter is exposed to the outside from the inner layer tube while being inclined with respect to the axis of the inner layer tube from the outlet provided in the inner layer tube. Further, since the inner layer tube is inserted into the outer layer tube, the positional relationship between the two can be adjusted by moving the inner layer tube passed through the outer layer tube. For this reason, in mammals having a uterine body angle, especially in mammals where the outer uterine ostium is located on the vaginal opening side from the blind end of the vagina and opens obliquely downward from above the vagina, The extraction position (exposed position) of the semen injection catheter can be adjusted according to the position of the uterine ostium, and the semen injection catheter can be easily entered from the external uterine ostium. And since a semen injection | pouring catheter is produced from a soft raw material, the catheter which entered the cervix from the external uterine ostium enters without resistance from the cervix to the uterine body and the uterine horn. Therefore, semen is surely injected into the uterine body, and an improvement in pregnancy rate is expected.

1A and 1B are plan views of components constituting an intrauterine semen injector according to an embodiment of the present invention, wherein FIG. 1A is a plan view of an outer layer tube, FIG. 1B is a plan view of an inner layer tube, and FIG. ) Is a plan view of a semen injection catheter. FIG. 2 is an explanatory view schematically showing the use state of the intrauterine semen injector shown in FIG. 1, wherein (a) shows a state in which the semen injection catheter is exposed to the outside at the distal end side of the inner tube outlet. The figure shown, (b) is a figure which shows the state which exposed the semen injection catheter to the exterior in the rear end side of the extraction port of an inner layer tube. 3A and 3B are cross-sectional views in which a part of the inner layer tube is broken. 4 (a) and 4 (b) are plan views of components constituting a catheter insertion assisting device according to another embodiment of the present invention, in which (a) is a plan view of an outer layer tube, and (b) is an inner layer tube. (C) is a side view of an inner layer tube. FIG. 5 is an explanatory view showing a use state of the catheter insertion assisting device shown in FIG. 4 and is a view seen from above. 6A and 6B are explanatory views of a catheter insertion assisting device which is still another embodiment of the present invention, in which FIG. 6A is a plan view of an outer layer tube having an auxiliary tube, FIG. 6B is a plan view of a rod, and FIG. ) Is a view of the state in which the rod is used as viewed from above. FIG. 7 is an explanatory view showing a use state of an intrauterine semen injector according to still another embodiment of the present invention. FIG. 7A is a side view showing a state where the fiber portion of the fiberscope is inserted into the auxiliary tube. (B) The figure which looked at the said state from upper direction, (c) is sectional drawing which looked at the AA direction of the figure (a). FIG. 8 is an explanatory view of the use of an intrauterine semen injector, which is still another embodiment of the present invention. FIG. 8A is a top view showing a state in which the fiber portion of the side view type fiberscope is inserted into the outer tube. FIG. 2B is a cross-sectional view when viewed in the AA direction of FIG.

  The intrauterine semen injector of the present invention comprises a semen injection catheter for injecting semen into the uterine body and a catheter insertion aid used when the catheter is inserted into the vagina of an animal. The auxiliary device includes a hard outer layer tube made of a resin material having both ends opened and a hard inner layer tube made of a resin material having at least one end opened, and the inner layer tube has an outer diameter that can be inserted into the outer layer tube and the outer tube. The other end has an outlet that has an inner diameter through which a semen injection catheter can be inserted, and that can be exposed by inclining the semen injection catheter inserted from the opening end of the inner layer tube with respect to the axis of the inner layer tube. It is provided near the other end opening. Hereinafter, the catheter insertion aid of the present invention and an intrauterine semen injector using the same will be described in detail with reference to the drawings.

  FIG. 1 is a view showing components of an intrauterine semen injector according to a first embodiment of the present invention. As shown in FIG. 1, the intrauterine semen injector includes an outer layer tube 10 having both ends opened, an inner layer tube 20 having one end blocked, and a semen injection catheter 30 for injecting semen. Among these, the outer layer tube 10 and the inner layer tube 20 are used as a catheter insertion assisting device used for assisting the insertion of the semen injection catheter 30. The catheter insertion assisting device according to the first embodiment includes an outlet 21 for exposing the semen injection catheter 30 to the side surface of the inner tube 20 as shown in FIG.

  The outer tube 10 is made of a hard tube made of a resin material. The outer tube 10 has both open ends. The inner layer tube 20 is inserted into the outer layer tube 10 in a semi-fixed state. The inner diameter of the outer tube 10 is slightly larger than or substantially the same as the outer diameter of the inner tube 20. In the present invention, the semi-fixed state means that the inner layer tube 20 can be passed through the outer layer tube 10 without applying a strong force to the inner layer tube 20, and the inner layer tube 20 does not fall out naturally when it is passed through the outer layer tube 10. This means that the surgeon does not move unless a certain amount of strong force is applied to the inner tube 20. That is, it is desirable that the outer diameter of the inner layer tube 20 and the inner diameter of the outer layer tube 10 be adjusted so as to be in such a state. If the outer layer tube 10 moves easily with a weak force, the outer layer tube 10 and the inner layer tube 20 cannot be successfully put into the vagina, and the semen injection catheter 30 exposed from the inner layer tube 20 is moved from the outer uterine ostium into the uterine horn. It is because it becomes impossible to put. The outer diameter of the outer tube 10 is not particularly limited, but is appropriately determined according to the inner diameter of the vagina of the animal to be artificially inseminated, ease of handling by the operator, and the like, and is preferably large enough not to burden the animal.

  The inner layer tube 20 is made of a hard tube made of a resin material. The inner tube 20 has a closed end 20a at one end, and the opposite end is an open end 20b. The inner layer tube 20 shown in FIG. 1B has a curved end surface of the closed end 20a. The inner diameter of the inner layer tube 20 is larger than the outer diameter of the semen injection catheter 30 and is adjusted to such an extent that the semen injection catheter 30 can be taken in and out of the inner layer tube 20 without requiring a large force.

  The inner layer tube 20 has an outlet 21 on the side surface near the closed end 20a. A semen injection catheter 30 is inserted into the semen injection catheter from the opening end 20b, and the semen injection catheter 30 is exposed from the outlet 21. The opening diameter of the outlet 21 is at least larger than the maximum diameter of the semen injection catheter 30. The outlet 21 may be approximately the same size as the maximum diameter of the semen injection catheter, but is preferably formed long in the axial direction as shown in FIG. This is because the outlet 21 formed long in the axial direction facilitates adjustment of the exposure position of the semen injection catheter 30. That is, the position where the semen injection catheter 30 is exposed in the outlet 21 is changed according to the individual of the target animal, and the semen injection catheter 30 is guided to the external uterine ostium. Accordingly, the size of the outlet 21 in the axial direction is determined in consideration of the difference in the position of the outer uterine ostium between animals. This size varies depending on the type of target animal, and is about 20 mm in the case of a dog (corresponding to the length B shown in FIG. 2B). The closed end 20a of the inner layer tube 20 is used for positioning when inserted into the vagina. That is, by pressing the closed end 20a against the deepest part of the vagina, the inner tube 20 can be stably held, and the outlet 21 can be positioned close to the outer uterine ostium. Therefore, when the closed end 20a of the inner layer tube 20 is pressed against the deepest part of the vagina, the position of the outlet 21 is determined so that the semen injection catheter 30 exposed from the outlet 21 can be satisfactorily inserted into the outer uterine ostium. Is preferred. For this reason, the position of the outlet 21 in the axial direction is also appropriately determined by the target animal. More specifically, in the case of a dog, the outlet 21 is positioned so that the tip of the outlet 21 is located about 5 mm from the closed end 20a of the inner tube 20 (corresponding to the length A in FIG. 2A). Provided.

  The inside of the inner layer tube 20 may be hollow up to at least the tip of the outlet 21. Although it may be hollow from the leading end of the outlet 21 to the closed end 20a, it is preferably closed from the leading end of the outlet 21 to the closed end 20a as shown in FIG. Furthermore, it is desirable that an inclined surface 23a is provided at the tip of the outlet 21 as shown in FIG. This is because the presence of the inclined surface 23 a makes it easier for the semen injection catheter 30 to be exposed from the outlet 21.

  The semen injection catheter 30 is made of a soft tube made of a resin material. The semen injection catheter 30 has a closed end 30a whose one end is blocked. The semen injection catheter 30 shown in FIG. 1C has a curved end surface. The semen injection catheter 30 has a hole 31 for injecting semen on the side surface near the closed end 30a. Further, a pump for injecting semen, a syringe for injection, and the like are connected to the opening end 30b at the other end of the semen injection catheter 30 via a connection tube (not shown). A semen injection catheter having a semen injection hole 31 at the tip can also be used, and various semen injection catheters known as the semen injection catheter 30 can be used.

  The outer tube 10 and the inner tube 20 and the semen injection catheter 30 are each made of a resin material. However, these resin materials are not limited as long as they do not impair the purpose of the present invention of semen injection. Absent. Examples of the resin material used include ethylene copolymers such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymers. The resin material used for each member may be the same type of resin material or a different resin material. For example, a polyethylene tube is used as the outer layer tube 10 and the inner layer tube 20, and a polypropylene tube is used as the semen injection catheter 30.

  The outer tube 10 and the inner tube 20 are made of hard tubes, and the semen injection catheter 30 is made of a soft tube. In the present invention, the meanings of hard and hard are used according to the purpose of use. That is, the term “hard” is used to mean that the outer layer tube 10 does not bend when used in the present invention, and the outer layer tube 10 can be inserted into the vagina with the inner layer tube 20 inserted. This means that it is only necessary to have such a rigidity that the positional relationship can be adjusted. Further, the inner layer tube 20 is rigid enough to allow the semen injection catheter 30 to be inserted through the outlet 21 of the inner layer tube 20 while being pressed against the deepest part of the vagina. It means that it only has to be done. Soft is used in the sense that it is soft and bends with a relatively small force, and the semen injection catheter 30 is soft enough to bend with a slight force, that is, it is pushed out of the inner tube 20 through the outlet 21 to the outside. It is flexible, but after entering the cervical canal from the outer uterine ostium, it means that even with a small pushing force, it needs to be hard enough to enter the cervix, uterine body, uterine horn from the outer uterine ostium .

  As shown in FIG. 2, the inner layer tube 20 is passed through the outer layer tube 10 and used, but the outer layer tube 10 and the inner layer tube 20 are not bonded and fixed. A semen injection catheter 30 is inserted into the inner layer tube 20. The inner tube 20 is used in a state where the closed end 20a is applied to the deepest part of the vagina. Therefore, the length of the inner layer tube 20 is at least longer than the length of the vagina of the subject animal, and needs to be long enough to move the position of the outer layer tube 10 with the inner layer tube 20 pressed against the deepest part of the vagina. . Specifically, the length of an intrauterine semen injector for dogs is about 300 mm. At the start of use, the outer layer tube 10 is placed at a position where the semen injection catheter 30 is exposed from the vicinity of the distal end of the outlet 21 of the inner layer tube 20 as shown in FIG. Depending on the situation, as shown in FIG. 2 (b), the outer tube 10 is pulled out from the vagina and placed in a position where the semen injection catheter 30 is exposed from the vicinity of the rear end of the outlet 21 of the inner tube 20. . Therefore, the length of the outer layer tube 10 is shorter than the length of the inner layer tube 20, but at the position shown in FIG. 2A, the end of the outer layer tube 10 (the end close to the vaginal opening) is such that the outer layer tube 10 can be moved. A length located outside the vagina is required. In the case of an intrauterine semen injector for dogs, the length of the outer tube 20 is about 200 mm. Since the tip of the semen injection catheter 30 is inserted to the uterine body, preferably the uterine horn, the length of the semen injection catheter 30 is longer than that of the inner layer tube 20, and the length of the inner layer tube 20 is about 300 mm. The length of the semen injection catheter 30 is about 500 mm. This length varies somewhat depending on the position of the hole 31 for semen injection. However, specific numbers such as the length of the outer layer tube 10, the inner layer tube 20 and the semen injection catheter 30, the position of the outlet 21 of the inner layer tube 20 are examples, and the catheter insertion assisting device of the present invention is one of these. Needless to say, the length is not limited. The outer diameter of the outer layer tube 10 and the outer diameter of the inner layer tube 20 are also determined as appropriate. For example, the outer diameter of the outer layer tube 10 is about 4 mm, and the outer diameter of the inner layer tube 20 is about 2.7 mm.

  The catheter insertion aid of the present invention is used as follows. The inner layer tube 20 is passed through the outer layer tube 10, and the outer layer tube 10 is positioned so that a part of the outlet 21 of the inner layer tube 20 can be seen on the distal end side of the outer layer tube 10 and the semen injection catheter 30 is exposed. Then, with this state maintained, the outer layer tube 10 and the inner layer tube 20 are inserted from the vaginal opening of the animal until the tip (closed end 20a) of the inner layer tube 20 hits the deepest part of the vagina. Next, with the tip of the inner layer tube 20 in contact with the deepest part of the vagina, the semen injection catheter 30 is inserted into the inner layer tube 20 by hand, and the tip is exposed from the outlet 21. At this time, the outer uterine ostium is searched at the tip of the semen injection catheter 30 while slightly rotating the outer layer tube 10. If the semen injection catheter 30 is further inserted while searching, if the semen injection catheter 30 enters the cervix from the uterine ostium, the semen injection catheter 30 enters further without resistance, but otherwise resists entry. It is easily discriminated whether or not it has entered the outer uterine ostium. And when resistance is felt, the outer layer tube 10 is rotated a little or the outer layer tube 10 is pulled back, and when the position where the semen injection catheter 30 enters without resistance is found, the semen injection catheter 30 is further advanced.

  As described above, when the auxiliary device of the present invention is used, the semen injection catheter 30 is forcibly exposed in a state inclined with respect to the axis of the inner tube 20, so that semen injection is performed as compared with the case where only the semen injection catheter 30 is used. The catheter 30 can be easily advanced into the uterus from the outside uterine ostium. In addition, the tip of the inner layer tube 20 not only functions to position the exposed position of the semen injection catheter 30, but also the position of the outer layer tube 10 can be adjusted, so that the exposure position and exposure direction (tilt angle) of the semen injection catheter 30 are changed. be able to. This makes it very easy to enter the uterine ostium and ensures the injection of semen into the uterine body. And since the outer layer tube 10 and the inner layer tube 20 are produced from the resin material, the intrauterine semen injector of this invention does not injure a vagina or an outer uterine ostium compared with the case where a metal catheter is used. Since the outer tube 10 is further hard, the catheter insertion aid is smoothly introduced from the vagina to the deepest part of the vagina, and the semen injection catheter 30 can be entered without taking the outer tube 10 in and out. The burden on is reduced.

  FIG. 4 is a view showing each part constituting a catheter insertion assisting device which is another embodiment of the present invention. The catheter insertion aid is also composed of the outer layer tube 10 and the inner layer tube 20. This catheter insertion assisting device differs from the catheter insertion assisting device shown in Example 1 in that the outlet 21 of the inner layer tube 20 is formed at the open end 20c serving as the outlet of the semen injection catheter 30.

  The outlet 21 is formed by inclining the vicinity of the opening end 20 c of the inner layer tube 20 with respect to the axis of the inner layer tube 20. As shown in FIG. 5, the inner layer tube 20 is inserted into the outer layer tube 10 with its open end 20 c exposed. The semen injection catheter 30 exposed from the open end 20c of the inner layer tube 20 is exposed from the inner layer tube while being inclined with respect to the axis of the inner layer tube. This inclination angle substantially follows the inclination angle β in the vicinity of the opening end 20 c of the inner layer tube 20. Therefore, it is preferable that this inclination angle β substantially coincides with the angle of the uterine angle with respect to the vagina (the direction in which the uterine body extends). In the case of a dog, this inclination angle β is 20 to 40 degrees.

  The inner layer tube 20 is inserted into the outer layer tube 10 in a semi-fixed state (see FIG. 5). The semen injection catheter 30 inserted from the opening end 20b of the inner layer tube 20 is inclined with respect to the axis of the inner layer tube 20 (or outer layer tube 10) from the outlet 21 formed at the opening end 20c at the other end. Forced exposure. The method of using this catheter insertion aid is substantially the same as the method of using the catheter insertion aid of Example 1. After inserting the outer layer tube 10 through the inner layer tube 20 into the vagina, the outer layer tube 10 is rotated slightly, the outer uterine ostium is searched at the tip of the semen injection catheter 30, and the semen injection catheter 30 is entered. If resistance to entry is felt, the outer layer tube 10 is slightly rotated or the inner layer tube 20 is moved back and forth to find a position where the semen injection catheter 30 enters without resistance. 30 is further entered. Even with such a simple configuration, the semen injection catheter 30 can be relatively easily inserted into the uterine body from the outer uterine ostium of the animal.

  The catheter insertion assisting device shown in FIG. 6 differs from the catheter insertion assisting device shown in the first and second embodiments in that an instrument in which the outer layer tube 10 and the auxiliary tube 50 are joined is used. The auxiliary tube 50 is a hard tube having both ends opened, and the auxiliary tube 50 is joined in parallel to the outer layer tube 10. In the catheter insertion assisting device shown in FIG. 6, the opening ends on the insertion side into both vaginas are aligned and the lengths of both are drawn the same, but as long as the positioning function of the rod 60 is exhibited as described below, It is not necessary to align the open ends of both, and the lengths of both need not be the same. Furthermore, in the catheter insertion aid, both the auxiliary tube 50 and the outer tube 10 are preferably hard, but at least one of them may be hard. This is because if the hard auxiliary tube 50 or the outer tube 10 can be smoothly inserted into the vagina, the other outer tube 10 or the auxiliary tube 50 is also inserted into the vagina.

  This catheter insertion assisting device includes a rod 60 having a curved end surface 60a. The inner diameter of the auxiliary tube 50 is slightly larger than or substantially the same as the outer diameter of the rod 60. The outer diameter of the rod 60 and the inner diameter of the auxiliary tube 50 allow the auxiliary tube 50 to be inserted without applying a large force to the rod 60. When the rod 60 is inserted into the auxiliary tube 50, it does not fall off naturally. It is desired that the surgeon be adjusted so that it does not move unless a force is applied to the rod 60. That is, the rod 60 is inserted into the auxiliary tube 50 in a semi-fixed state. This is because the rod 60 functions to position the inner layer tube 20 when the semen injection catheter 30 is inserted.

  The method of using the intrauterine semen injector is not particularly different from the method of using the intrauterine semen injector shown in Example 2, but the distal end surface 60a of the rod 60 is 5 mm from the outlet 21 of the inner tube 20 at the start of use. The insertion position of the rod 60 is adjusted so that it protrudes to a certain extent. Thereafter, the outer tube 20 is inserted into the vagina together with the auxiliary tube 50 until the distal end surface 60a of the rod 60 hits the deepest part of the vagina. At this time, it is preferable to insert the outer tube 20 on the auxiliary tube 50 as shown in FIG. Then, the semen injection catheter 30 is inserted into the inner tube 20 with the distal end surface 60a of the rod 60 being in contact with the deepest part of the vagina, and the distal end is exposed from the outlet 21. If resistance to entry of the semen injection catheter 30 is felt, the outer layer tube 10 is slightly rotated or the outer layer tube 10 is pulled back to find a position where the semen injection catheter 30 enters without resistance. The semen injection catheter 30 is advanced.

  In this embodiment, the rod 60 performs a positioning function when the semen injection catheter 30 is inserted, and the semen injection is performed by moving the auxiliary tube 50 and the outer tube 10 while maintaining the state where the rod 60 is applied to the deepest part of the vagina. The exposure position of the catheter 30 can be changed. Further, since the outer tube 10 and the auxiliary tube 50 are integrated, there is an advantage that the outer tube 10 and the auxiliary tube 50 are easy to hold by hand and easy to operate compared to the catheter auxiliary device of the second embodiment.

  The intrauterine semen injector shown in FIG. 7 is the same as the intrauterine semen injector shown in Example 1 described above, and is further provided with a side-view type fiberscope 40. The catheter insertion assisting device in this intrauterine semen injector has an auxiliary tube 50 joined to the outer tube 10 and has the same configuration as the catheter assisting device of Example 3. The auxiliary tube 50 is a hard tube formed from a resin material, and the inner diameter thereof is larger than the outer diameter of the fiber portion 41. An intrauterine semen injector can also be configured using such a catheter insertion aid.

  A fiber portion 41 of the side-view type fiberscope 40 is passed through the auxiliary tube 50. The side-view type fiberscope 40 has a fiber portion 41 composed of an optical fiber or the like that forms a light guide path, and has an observation window 42 on the side surface near the tip of the fiber portion 41. This window 42 has a field of view 45 with a viewing angle α. In FIG. 7, only a part of the fiber part 41 is drawn, and a control part and a light source for adjusting the direction of the viewing angle α are omitted. The side-view type fiberscope 40 has a viewing angle α that is as wide as possible so that both the outer uterine ostium and the distal end portion of the semen injection catheter 30 at a position away from the outer uterine ostium are included in the visual field 45 in the vagina. What has is used preferably. By doing so, the semen injection catheter 30 can be advanced while confirming the position of the external uterine ostium.

  In the catheter insertion assisting device shown in FIG. 7, the positional relationship between the auxiliary tube 50 and the outer layer tube 10 is such that the opening ends on the insertion side to the vagina are aligned and the lengths of both are drawn the same. They do not need to be aligned and their length need not be the same. Further, in the catheter insertion aid, both the auxiliary tube 50 and the outer layer tube 10 are preferably hard, but only one of them may be hard. This is because if the hard auxiliary tube 50 or the outer tube 10 can be smoothly inserted into the vagina, the other outer tube 10 or the auxiliary tube 50 is also inserted into the vagina accordingly. Further, as shown in FIG. 7, the outer layer tube 20 is preferably positioned on the auxiliary tube 50 when inserted into the vagina. This is because the distal end of the semen injection catheter 30 can easily enter the visual field 45 of the side-view type fiberscope 40, and the entry operation is facilitated.

  In the fourth embodiment, the inner diameter of the auxiliary tube 50 is made slightly larger than or substantially the same as the outer diameter of the fiber portion 41 of the fiberscope 40, and the fiber portion 41 is inserted into the auxiliary tube 50 in a semi-fixed state. May be. That is, the inner diameter of the auxiliary tube 50 and the outer diameter of the fiber 41 can be inserted through the auxiliary tube 50 without applying a large force to the scope 40, and when the scope 40 is inserted through the auxiliary tube 50, the auxiliary tube 50 may fall out naturally. Alternatively, adjustment may be made so that the surgeon does not move unless a force is applied to the scope 40. By doing in this way, the positioning function of the inner layer tube 20 at the time of insertion of the semen injection catheter 30 can be given to the front-end | tip of the scope 40. FIG.

  FIG. 8 is a view showing an intrauterine semen injector which is still another embodiment of the present invention. The catheter auxiliary instrument in this intrauterine semen injector consists of the outer layer tube 10 and the inner layer tube 20, and does not include the auxiliary tube 50 or the auxiliary. The outer layer tube 10 has an inner diameter that allows the fiber portion 41 of the side-view type fiberscope 40 and the inner layer tube 20 to pass through simultaneously.

  The outer layer tube 10 has an oval cross section, and the inner layer tube 20 and the fiber portion 41 are disposed in the outer layer tube 10. The positional relationship between the inner layer tube 20 and the fiber portion 41 may be any relationship as long as the tip of the semen injection catheter 30 can be confirmed within the visual field 45 of the side-view type fiberscope 40. For example, in FIG. 8, the inner layer tube 20 is positioned on the fiber portion 41. However, the inner layer tube 20 does not necessarily have to be directly above the fiber portion 41, and can be used even if the inner layer tube 20 is positioned obliquely above or next to the fiber portion 41 as long as there is no hindrance to the operation. Furthermore, the cross-sectional shape of the outer layer tube 10 is not limited to an elliptical shape, and it is sufficient that both the fiber portion 41 and the inner layer tube 20 can be passed.

  The operation method of the intrauterine semen injector is not particularly different from the operation method of the intrauterine semen injector shown in the first embodiment, but the outer uterine ostium and the semen injection catheter 30 are within the visual field 45 of the side view type fiberscope 40. It is operated so as to include both of the tip portions.

  As described above, the catheter insertion assisting device according to the present invention is provided with the outlet 21 that allows the semen injection catheter 30 to be exposed by inclining the semen injection catheter 30 with respect to the axis of the inner layer tube 20, or the side surface in the vicinity of the opening end 20a. Therefore, the semen injection catheter 30 is tilted with respect to the inner layer tube 20 (or the outer layer tube 10) and is exposed in the vagina. For this reason, animals such as dogs that have an outer uterine mouth near the vagina opening from the deepest part of the vagina, and the outer uterine ostium opens downward, or the outer uterine ostium opens slightly from the side. The semen injection catheter 30 can easily enter the uterine horn or uterus. Moreover, since the insertion position of the semen injection catheter 30 can be changed by moving the inner layer tube 20 without moving the outer layer tube 10 in contact with the vagina, the burden on the animal when the semen injection catheter 30 is inserted is also reduced. .

  According to the present invention, there is provided an intrauterine semen injector capable of reliably injecting semen into the uterine body or uterine horn without damaging the vagina or uterus. Thereby, the pregnancy rate by artificial insemination is increased.

10 Outer tube 20 Inner layer tube 21 Drawer 30 Semen injection catheter 31 Hole for injecting semen 40 Side view type fiberscope 50 Auxiliary tube 60 Rod

Claims (22)

A catheter insertion aid used to insert a semen injection catheter into an animal's uterus,
Provided with an outer tube made of a resin material with both ends open and an inner tube made of a resin material with at least one open end,
The inner layer tube has an outer diameter that can be inserted through the outer layer tube and an inner diameter that can be inserted through the semen injection catheter, and the semen injection catheter that is inserted into the inner layer tube from the opening end with respect to the axis of the inner layer tube A catheter insertion assisting device provided with an outlet that is inclined and exposed at the other end opening or a side surface near the other end opening.
Auxiliary equipment.   The catheter insertion assisting device according to claim 1, wherein the other end opening of the inner layer tube is a closed end, and the outlet is an opening formed on a side surface near the closed end.   The catheter insertion assisting device according to claim 2, wherein the outlet is formed long in the axial direction.   The catheter insertion assisting device according to claim 3, wherein the axial length of the outlet is 15 to 20 mm.   The catheter insertion assisting device according to any one of claims 2 to 4, wherein an end surface of the closed end of the inner layer tube is a curved surface.   The catheter insertion auxiliary device according to any one of claims 1 to 5, wherein a length of the outer layer tube is shorter than a length of the inner layer tube, and the inner layer tube is inserted into the outer layer tube in a semi-fixed state.   The catheter insertion assisting device according to any one of claims 1 to 6, wherein an inclined surface is provided in the inner layer tube to expose a distal end of the inserted semen injection catheter to the outside from the outlet.   The catheter insertion assisting device according to any one of claims 1 to 7, wherein the outer layer tube has an inner diameter through which a fiber portion which is a light guide path of a side view type fiberscope having a visual field on the side surface with the inner layer tube can be inserted.   The catheter inner assist device according to any one of claims 1 to 8, wherein the inner layer tube and the outer layer tube are hard.   The auxiliary tube which has an inner diameter which can insert the fiber part used as the light guide of the side view type fiberscope which has a field of view in the side, and the auxiliary tube and the outer layer tube were joined in parallel. The catheter insertion assisting device according to Item 1.   The catheter insertion assisting device according to claim 10, wherein the auxiliary tube is made of a resin material.   The catheter insertion assisting device according to claim 10 or 11, wherein the inner layer tube, the outer layer tube and / or the auxiliary tube are rigid.   The catheter insertion assisting device according to claim 1, wherein the other end of the inner layer tube is an open end, and the outlet is formed of the open end formed by inclining the vicinity of the open end of the inner layer tube.   The catheter insertion assisting device according to claim 13, wherein an inclination angle of the inner layer tube in the vicinity of the open end is 20 to 40 degrees with respect to an axis of the inner layer tube.   The catheter insertion assisting device according to claim 13 or 14, wherein a length of the outer layer tube is shorter than a length of the inner layer tube, and the inner layer tube is inserted into the outer layer tube in a semi-fixed state.   The catheter insertion auxiliary device according to any one of claims 13 to 15, wherein an auxiliary tube having both ends opened is joined in parallel to the outer layer tube.   The catheter insertion assisting device according to claim 16, further comprising a rod having a curved distal end surface, wherein the auxiliary tube has an inner diameter through which the rod can be inserted.   The catheter insertion assisting device according to claim 16 or 17, wherein a length of the auxiliary tube is shorter than a length of the rod, and the rod is inserted into the auxiliary tube in a semi-fixed state.   The catheter insertion assisting device according to claim 16, wherein the auxiliary tube has an inner diameter through which a fiber portion which is a light guide path of a side-view type fiberscope having a visual field on a side surface can be inserted.   The catheter insertion assisting device according to any one of claims 16 to 19, wherein the auxiliary tube is made of a resin material.   21. The catheter insertion assisting device according to any one of claims 16 to 20, wherein the outer layer tube and / or the auxiliary tube is hard. The catheter insertion assisting device according to any one of claims 1 to 21,
Intrauterine semen injector for animals equipped with a semen injection catheter.

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