the artificial insemination probe described below is intended in particular for the insemination of pigs , regarding sows and gilts . this use is not , however , limiting . in this text , the notions of front and back as well as proximal and distal are considered in the general direction of insertion of the probe into the animal . the probe 1 is a single - piece assembly that comprises a cylindrical body 2 , similar to a catheter , that is a hollow tube in a semi - rigid plastic material , in particular polypropylene . this hollow tube is extended backward by a flexible tube 3 that can be deformed when it is placed under pressure and that is impermeable to air . this flexible tube 3 is molded onto the proximal end 2 a of the cylindrical body 2 . the flexible tube 3 is extended backward by a plug 4 that is made up of a stopper support 8 that is a hollow rigid piece whereof the axial opening 9 , serving to fill the probe 1 with the animal semen , opens to the inside of the flexible tube 3 and consequently also of the cylindrical body 2 . this axial opening 9 is , in fig3 , closed by a stopper 10 . the plug element 4 can comprise , at its stopper support 8 , inner marks that can cooperate with free strips formed around the stopper 10 . thus , the marks mechanically block the stopper 10 so as to prevent the latter from rising back toward the opening of the stopper support 8 when an overpressure is exerted inside the flexible tube 3 . furthermore , it is possible to provide that the flexible tube 3 is molded onto the proximal end 2 a of the cylindrical body 2 on at least one third of its length , preferably on more than one third , and less than half of the length of the cylindrical body 2 , in order to shift the formation of the cuff when the tube 3 is inflated toward the plug 4 . this arrangement makes it possible for the cylindrical body 2 to be perfectly inserted into the genitalia of the animal . the flexible tube 3 can also include a local overthickness of material ( not shown in the figures , for example in the vicinity of 0 . 4 mm for 10 mm , in order to offset the formation of the balloon when the tube 3 is inflated toward the plug 4 , the balloon forming between the overthickness on the one hand , and the plug 4 on the other hand . this local overthickness is preferably formed at the inner diameter of the flexible tube 3 , but could also be formed at the outer diameter of said flexible tube 3 . the proximal end 3 a of the flexible tube 3 is also molded onto the stopper support 8 of the plug 4 . it is also possible to provide a stop skirt 16 at the distal end of the flexible tube 3 that is molded onto the proximal end 2 a of the cylindrical body 2 . this stop skirt 16 is preferably overmolded on the distal end of the flexible tube 3 . the purpose of this stop skirt 16 is to help with the placement of the probe 1 in order to ensure that the distal element 5 is well - positioned at the cervix . this stop skirt 16 also favors the catching of the probe 1 inside the genitalia of the animal . thus , this stop skirt 16 can be inserted into the genitalia of the animal via a pusher positioned between the skirt and the cuff formed when the flexible tube 3 is inflated as shown in fig3 . the purpose of the pusher is to deform the stop skirt 16 so that the latter can be inserted inside the genitalia of the animal . the probe 1 also includes a distal element 5 that is a rigid tubular piece in which the distal end 2 b of the cylindrical body 2 is fitted . this distal element 5 includes an inner shoulder 11 that serves as a stop for the hollow body 2 during its insertion into the distal element 5 . the probe 1 includes a discharge opening 7 , which in this case is made up of the inside recess of the distal element 5 in its end portion . this discharge opening 7 is plugged by a material 6 that is solid at ambient temperature and liquefies at the temperature prevailing inside the vagina of the animal . this may in particular be a wax known by the name witepsol ® w25 . to avoid any alteration of this material before using the probe , in the embodiment illustrated in fig3 , this material 6 is contained in a hollow tip 12 that is fitted into the front portion 5 b of the distal element 5 , as far as the shoulder 11 that also serves as a stop , and which includes an extension 13 coming to the outside of the distal element 5 and covering the discharge opening 7 . this extension 13 is frangible so that the discharge opening is freed by sectioning said extension , immediately before using the probe . the distal element 5 also comprises an annular extension 17 surrounding the frangible end 13 so that the semen is correctly poured at the desired location and does not flow on the distal element 5 . furthermore , the hollow tip 12 includes a hammered proximal end so as to curve its outer periphery around the plug material 6 and prevent the wax , as a function of the storage conditions , from flowing through the hollow end 12 toward the inside of the cylindrical body 2 . the distal element 5 and the portion of the cylindrical body 2 located behind the distal element are covered , by molding , with a sleeve comprising at least one skirt 14 . this sleeve 15 , including the skirt ( s ) 14 , is made from a flexible material , in particular elastomer and preferably sebs . the molding of the sleeve 15 onto the distal element 5 and partially onto the cylindrical body 2 , like the molding of the flexible tube 3 onto the proximal end 2 a of the cylindrical body 2 and onto the stopper support 8 , makes it possible to obtain very good securing of these different elements to one another and especially complete sealing , making it possible to ensure excellent preservation of the semen once it has been introduced into the probe . the filling of the probe can be done in two ways depending on the filling material one has . if this material includes a needle - type injector , the stopper 10 covering the axial opening 9 of the stopper support 8 is in a material that on the one hand can be pierced by the injector and on the other hand can close sealably when the injector is removed . this may be an elastomer , and in particular sebs . according to another route , the stopper 10 is only inserted into the axial opening 9 after said filling has been done . in that case , the material of the stopper 10 is not necessarily of the type that can be pierced by the injector and can close sealably when the injector is removed . it is in fact possible to use a stopper 10 made from a rigid material , such as polypropylene , which is positioned after filling to cover the axial opening 9 of the stopper support 8 . this positioning after filling can be done automatically , in particular in the context of an automated filling method . whatever the case may be , due to the quantity of semen injected under pressure during filling of the probe , a double phenomenon occurs , i . e . expansion of the flexible tube 3 in the zone that extends between the two ends serving for molding , as illustrated in fig2 , and on the other hand the formation of an overpressure in the cylindrical body 2 . it should be noted that the semen is primarily located in the expanded flexible tube 3 , which can nevertheless partially occupy the cylindrical tube 2 . this distribution can also evolve over time between the filing and use of the probe . in the example illustrated in fig3 , the sleeve 15 includes a single skirt that assumes a spiral configuration and the diameter of which evolves over the length of the sleeve . this evolution is progressive on a first series 14 . 1 corresponding to several turns , then it is degressive on a second series 14 . 2 also corresponding to several turns , and lastly it is progressive again on a third series 14 . 3 corresponding to several turns . the optimal positioning of the probe 1 in the animal is obtained when the turns with the larger diameter are situated on either side of the cervix , which makes it possible to obtain maximum sealing . of course , it would be possible to obtain the same effect by using not a single spiral skirt , but a plurality of annular skirts spaced apart from one another on the length of the sleeve 15 , as illustrated in fig1 . the ensure the protection of the probe before and after it is filled , it can be stored in a sanitary pouch . more specifically , this pouch is made from a thermoplastic material and is sized to contain the distal element , the cylindrical body and the hollow tube , while it is thermowelded , for example by ultrasound , around the stopper support 8 , immediately behind the molding by the flexible tube 3 . the filling of the probe 1 with the semen can therefore be done while the probe is stored in its sanitary pouch . to implement the probe , the operator separates the sanitary pouch from the probe , knowing that precuts formed in the pouch can facilitate that operation . the operator grasps the frangible extension 13 and separates it from the tip 12 , thereby freeing the discharge opening 7 , which is covered by the material 6 . he then inserts the probe into the animal while positioning it optimally as mentioned above . the total length of the distal element and the cylindrical body is determined so that the flexible tube 3 remains outside the animal . given the temperature prevailing inside the animal , the material 6 gradually liquefies , freeing the passage of the discharge opening 4 . due to the overpressure existing inside the cylindrical body 2 , this release of the discharge opening 4 creates a suction phenomenon that causes the semen contained inside the flexible tube 3 and possibly the cylindrical body 2 to move toward the discharge opening 7 and causes it to flow into the uterus of the animal . this movement also occurs due to the fact that the flexible tube 3 , freed from the overpressure , tends to return to its initial volume . it is also caused by a suction phenomenon due to the natural movements of the uterine wall . given that the flexible tube 3 remains outside the animal , it is possible for the operator to observe the behavior of said flexible tube 3 during the insemination . one will see that at the end of insemination , the flexible tube 3 at least partially assumes a flat shape , which could mean that a certain vacuum forms inside the probe . one can see that when this phenomenon occurs , the residual quantity of semen in the probe is only several millimeters for a quantity of semen inserted into the probe of about 85 ml . the plug material 6 , once liquefied , comes into contact with the semen that moves through the hollow tip 12 and the discharge opening 7 . this contact can be used by adding an active ingredient into said material that acts on one of the components of the semen , in particular an active ingredient that acts on the motility of the spermatozoids . comparative tests have made it possible to confirm the excellent preservation of the semen as well as the improved motility of the spermatozoids contained in said semen . furthermore , on a series of tests , all of the inseminations done have obtained positive results , sows having been diagnosed pregnant 21 days after insemination .
the present invention relates to a probe for artificially inseminating an animal , including : a cylindrical body to be inserted inside the vagina of the animal and ending in a distal element provided with a discharge opening ; and a storage space for semen to be injected . the cylindrical body consists of a hollow tube , and the storage space comprises a flexible tube that is molded onto the proximal end of the cylindrical body on one side and onto a plug on the other side , said plug allowing the storage space to be filled under pressure . in the inoperative position , after being filled , the semen is located mainly in the expanded flexible tube while an overpressure prevails inside the cylindrical body . in the operative position , when the flexible tube is outside the vagina of the animal , the semen is moved into the entire cylindrical body through the discharge opening under the effect of suction and of the contraction of the flexible tube returning to the original volume thereof .