Balloon catheter for uterine cavity perfusion and use method thereof

Abstract

The invention relates to a balloon catheter for uterine cavity perfusion and a using method thereof.The balloon catheter comprises a catheter body and an injection connector, a second closed channel and a second perfusion channel which are arranged in a herringbone crossing mode are arranged in the injection connector, two balloons are sequentially arranged on the outer wall of the front portion of the catheter body, the rear end of the catheter body is connected with the injection connector, and the second closed channel is communicated with the second perfusion channel. A closed channel is arranged in the tube body and is communicated with the two balloons through the air outlet holes respectively; a perfusion channel is further arranged in the tube body, and a liquid outlet in the end of the perfusion channel is located in the end of the tube body. According to the balloon catheter, the two balloons share one closed channel, so that the additional benefit is that the balloon catheter can be made thinner, and the balloon catheter can better extend into a cervical canal under the condition that the diameter of the catheter body is smaller than or equal to 3mm, so that the trauma to a patient is smaller. In addition, by means of the balloon catheter, outflow of substances poured into the uterine cavity can be effectively avoided through the corresponding use method of filling the balloon, and therefore effective uterine cavity pouring treatment can be conducted on a patient.

Description

Technical Field

[0001] The present invention relates to the technical field of uterine cavity perfusion, and in particular to a balloon catheter for uterine cavity perfusion and a use method thereof. Background Art

[0002] At present, there are more and more operations such as PRP intrauterine perfusion and immunotherapy that require injection of fluid into the uterus. In most cases, the operation is completed with a catheter or artificial insemination tube. There are two problems with using these materials for the above operations:

[0003] 1. If an artificial insemination tube is used for intrauterine perfusion, the patient needs to maintain the same position as the injection for a period of time after the tube is withdrawn to ensure that the intrauterine perfusion fluid can stay in the uterus for a longer period of time and achieve a better effect. After the patient stands up, the perfusion fluid will still flow out because the cervical opening is downward.

[0004] 2. If a catheter with a balloon such as a urinary catheter is used, since the internal cervical os and cervical canal cannot be completely closed, fluid will still flow out after the patient stands up, and the injection joint of a balloon catheter such as a urinary catheter is large, it is very inconvenient to leave it in the patient's body.

[0005] In order to solve this problem, in the prior art, for example, "a cervical dilatation balloon catheter" with application number 202411156524.X is characterized in that it has two balloons, which can be used to close the internal cervical os and the cervical canal respectively, but the two balloons each use a medium channel, and a total of 2 medium channels are used to complete the filling. If this design is used for uterine cavity perfusion, at least 1 perfusion channel is required, and there are at least 3 channels in total on the pipeline, so the tube body is relatively thick. The patient undergoing intrauterine perfusion is not pregnant, and the cervical canal is very thin. The diameter of such a balloon catheter will be greater than 3 mm, and the patient will need to be dilated before placement, which will cause trauma to the patient and is inconvenient for the doctor to operate. Summary of the invention

[0006] The object of the present invention is to provide a balloon catheter for uterine cavity perfusion and a method of using the same, so as to solve the problems encountered in the above-mentioned background technology.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] A balloon catheter for intrauterine perfusion comprises a tube body and an injection connector, wherein the injection connector is provided with a second closed channel and a second perfusion channel arranged in a herringbone shape, a balloon A and a balloon B are arranged in sequence on the front outer wall of the tube body, the rear end of the tube body is connected to the injection connector, a first closed channel connected to the second closed channel is arranged inside the tube body, and the first closed channel is communicated with balloon A and balloon B respectively through air outlets; a first perfusion channel connected to the second perfusion channel is also arranged inside the tube body, and the end liquid outlet of the first perfusion channel is located at the end of the tube body.

[0009] In the above solution, during implementation, the balloon A has an inverted conical structure, and the wall thickness of the balloon A changes in a stepped manner, and the balloon B has a cylindrical structure.

[0010] In the above solution, the diameter of the tube body is not greater than 3 mm to facilitate pushing and placement in the uterine cavity. An adjustment tube is sleeved on the front part of the tube body. The adjustment tube is used to adjust the filling sequence of the balloons according to clinical needs; the adjustment tube wraps the balloon A or the balloon B and is removed from the front end of the tube body before the balloon catheter is pushed into the uterine cavity.

[0011] In the above solution, a blocking device is sleeved on the rear part of the tube body. The blocking device is slidably connected to the tube body before uterine cavity perfusion and locks the tube body after uterine cavity perfusion to seal the injected medium inside the tube body. As a preferred solution, the blocking device is integrally a smooth curved surface body or a circular structure.

[0012] Specifically, the blocking device includes a blocking ball A and a blocking ball B. The blocking ball A and the blocking ball B have the same structure and are symmetrically arranged, and cooperate with each other and buckle together during use. One side of the installation end face of the blocking ball A is provided with a fixing hook A, the other side of the installation end face of the blocking ball A is provided with a fixing groove A, and a blocking groove A is formed in the middle of the installation end face of the blocking ball A; one side of the installation end face of the blocking ball B is provided with a fixing groove B that cooperates with the fixing hook A, the other side of the installation end face of the blocking ball B is provided with a fixing hook B that cooperates with the fixing groove A, and a blocking groove B that cooperates with the blocking groove A is provided in the middle of the installation end face of the blocking ball B.

[0013] The end of the fixing hook A is provided with a first locking tooth A, and the middle of the blocking ball A is provided with a first locking tooth B; the middle of the cavity of the fixing groove A is provided with a first fixing tooth groove A, and the bottom of the cavity of the fixing groove A is provided with a first fixing tooth groove B; the middle of the cavity of the fixing groove B is provided with a second fixing tooth groove A that cooperates with the first locking tooth B, and the bottom of the cavity of the fixing groove B is provided with a second fixing tooth groove B that cooperates with the first locking tooth A; the middle of the fixing hook B is provided with a second locking tooth B that cooperates with the first fixing tooth groove A, and the end of the fixing hook B is provided with a second locking tooth A that cooperates with the first fixing tooth groove B.

[0014] Simply put, the blocking device consists of two semicircular spheres A and B of the same shape, and the inside of the sphere is composed of a fixed hook, a fixed groove, and a blocking groove. There is a tooth on the fixed hook, which can bite the two fixed tooth grooves in the fixed groove. When the blocking ball A faces the blocking ball B, the fixed hook A can be placed into the fixed groove B, and the first tooth A bites the second fixed tooth groove A; at this time, the fixed hook B is also placed into the fixed groove A, and the second tooth A bites the first fixed tooth groove A. At this time, there is a certain gap between the blocking groove A on the blocking ball A and the blocking groove B on the blocking ball B. The two spheres clamp the tube body with the blocking groove. The blocking device can slide between the injection connector and the balloon on the tube body, and can slide on the tube body without affecting the liquid flow inside the tube body.

[0015] After the uterine cavity perfusion and the air bag filling and sealing are completed, the two hemispheres of the blocking device are pressed oppositely, and the first clamping tooth A on the fixing hook A continues to move deep into the fixing groove B and bites the second fixing tooth groove B in the fixing groove B; at the same time, the second clamping tooth A on the fixing hook B continues to move deep into the fixing groove A and bites the first fixing tooth groove B in the fixing groove A. At this time, the gap between the blocking ball A and the blocking ball B is fixed very small, and the channel in the tube body is flattened and has no passability. At this time, the tube body between the blocking device and the injection connector can be cut off, and the blocking device can be left in the body.

[0016] A method for using a balloon catheter for intrauterine perfusion, if the clinical procedure for balloon filling is required, pretreatment may be performed first, such as the following steps:

[0017] S01. Before inserting the balloon catheter, place the adjustment tube over the balloon to be inflated in the future.

[0018] S02. Inject fluid to inflate the balloon that is expected to be filled first, and then deflate it, so that the balloon that is expected to be filled first can obtain the structural advantage of being filled after being stressed.

[0019] S03. Take out the adjustment tube.

[0020] Regardless of whether it has been preprocessed, you can proceed as follows:

[0021] S1. Place the balloon and tube into the uterine cavity, making sure that balloon A is inside the internal cervical os and balloon B is inside the cervical canal.

[0022] S2. Inject the fluid into the first closed channel through the injection connector via the second closed channel. It is expected that the first-filled balloon will be filled first. After the internal tension of the first-filled balloon is greater than the pressure of the injected fluid, the fluid will enter the second-filled balloon and fill it up.

[0023] S3. If preprocessing is not performed, after the balloon B is filled and wrapped by the cervical canal, it is affected by resistance, and it is difficult for the subsequent fluid to continue to be injected and is diverted to the balloon A. When the balloon A is filled, it expands laterally due to the gradient change of the wall thickness and blocks the internal os of the cervix.

[0024] S4. Through the injection joint, inject the intrauterine perfusion content into the first perfusion channel using the second perfusion channel. Since both the cervical orifice and the cervical canal are blocked by the balloon A and the balloon B, the intrauterine perfusion content can thus be retained in the uterus for a long time.

[0025] S5. Move the blocking device on the tube body to an appropriate position, press the blocking ball towards each other. The two fixed teeth on the blocking ball A bite into the two fixed tooth grooves in the fixed groove of the blocking ball B, and the two fixed teeth on the blocking ball B bite into the two fixed tooth grooves in the fixed groove of the blocking ball A. The distance in the blocking groove is compressed, and the tube body is squeezed and loses the liquid passing effect.

[0026] S6. Cut the tube body between the blocking device and the injection joint, and let the tube body and the blocking device be naturally placed in the vagina to avoid the risk of contact with the outside world and infection.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The additional benefit brought by the fact that the balloon A and the balloon B share a closed channel is that the balloon catheter can be made thinner, and the diameter of the tube body is not greater than 3 mm. Thus, in the case where the diameter is less than or equal to 3 mm, it can better extend into the cervical canal. This benefit also brings advantages to the later treatment, that is, in the later stage, it is not necessary to dilate the cervix of the patient to place this balloon catheter, the operation is more convenient, and the trauma to the patient is smaller.

[0029] 2. The balloons on the tube body lock the internal os of the cervix and the cervical canal, and the blocking device locks the channel inside the tube body. By clamping the closed channel with the blocking device, the two continuously filled balloons used for closing achieve a closing effect; by clamping the perfusion channel with the blocking device, it is possible to avoid the backflow of the fluid in the uterus. At the same time, the smooth spherical body will not scratch the tissue in the vagina, and the injection joint is cut off to prevent the tube body extending from the uterus from contacting the outside world to reduce the risk of infection, which also helps to improve the comfort of the patient.

[0030] 3. The balloon catheter is relatively slender, and the blocking device also has a relatively small volume. The patient does not feel a foreign body sensation, and the doctor can perform the clamping operation with one hand, which is more convenient, the operation process takes less time, and the psychological pressure of the patient is reduced.

[0031] Therefore, it can be said that by using this balloon catheter and through the corresponding usage methods of filling the balloons, it is possible to effectively prevent the substances in the uterine cavity from flowing out, thereby effectively performing intrauterine perfusion treatment on the patient. Description of the Drawings

[0032] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0033] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 is Figure 1 a schematic diagram of the structure of balloon A in

[0035] Figure 3 is a schematic diagram of the structure of the blocking device in the present invention;

[0036] Figure 4 is a schematic diagram of the structure of the blocking device in the semi-closed state in the present invention;

[0037] Figure 5 is a schematic diagram of the structure of the blocking device in the fully closed state in the present invention;

[0038] Figure 6 is a schematic diagram of the structure of the blocking device in the open state in the present invention.

[0039] Reference numerals in the figure: 1 - balloon A; 2 - balloon B; 3 - tube body; 31 - first closed channel; 32 - first perfusion channel; 4 - injection joint; 41 - second closed channel; 42 - second perfusion channel; 5 - adjustment tube; 6 - blocking device; 61 - blocking ball A; 611 - fixing hook A; 612 - first tooth A; 613 - first tooth B; 614 - fixing groove A; 615 - first fixing tooth groove A; 616 - first fixing tooth groove B; 617 - blocking groove A; 62 - blocking ball B; 621 - fixing hook B; 622 - second tooth A; 623 - second tooth B; 624 - fixing groove B; 625 - second fixing tooth groove A; 626 - second fixing tooth groove B; 627 - blocking groove B. Detailed Embodiments

[0040] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will now be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the relevant components of the present invention.

[0041] According to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various interchangeable structural ways and implementation ways. Therefore, the following detailed embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0042] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0043] Example 1, as Figure 1 shown, a balloon catheter for intrauterine perfusion includes a catheter body 3 and an injection connector 4. A closed channel and a perfusion channel are respectively arranged in the catheter body 3 and the injection connector 4 to facilitate the connection between the two and facilitate inflation or perfusion of the medium.

[0044] Among them, the inside of the injection connector 4 corresponds to the catheter body 3 and has at least two channels, which are docked with the perfusion channel and the closed channel in the catheter body 3. The perfusion channel in the injection connector 4 can be directly connected to a commercially available syringe at the rear end, or can be connected to a one-way valve for perfusing liquid into the uterus. The one-way valve is made of silicone or other soft materials and can pass through a guide wire to facilitate operation. The closed channel in the injection connector 4 is connected to a flow control device inside or at the rear end for filling the balloon or withdrawing the substances in the balloon.

[0045] The injection connector 4 is provided with a second closed channel 41 and a second perfusion channel 42 arranged in a herringbone cross. Balloons A1 and B2 are successively arranged on the outer wall of the front part of the catheter body 3. Balloons A1 and B2 are the balloons described above. The rear end of the catheter body 3 is connected to the injection connector 4. A first closed channel 31 connected to the second closed channel 41 is arranged inside the catheter body 3. The first closed channel 31 is communicated with balloons A1 and B2 respectively through air holes, so that the two balloons can be filled with liquid or inflated through this closed channel for filling the balloons.

[0046] In addition, a first perfusion channel 32 connected to the second perfusion channel 42 is further arranged inside the catheter body 3. The end liquid outlet of the first perfusion channel 32 is located at the end of the catheter body 3 for extending into the uterine cavity to perfuse the liquid medium.

[0047] That is to say, there are at least two channels inside the catheter body 3, namely the perfusion channel and the closed channel. Among them, the front end of the first perfusion channel 32 passes through balloons A1 and B2 (not connected) and directly faces the uterine cavity for injecting and perfusing liquid into the uterine cavity. The front end and the middle section of the first closed channel 31 are respectively connected to balloons A1 and B2, and can fill the balloons with liquid and aspirate the substances in the balloons.

[0048] For the shapes of the two balloons, the fixation effect in the uterine cavity and the cervix is determined. The circular and elliptical structures adopted in the existing balloon catheters are suitable for hemostasis and are obviously not suitable for intrauterine perfusion surgery.

[0049] As a preferred solution, please refer to Figure 2, the balloon A1 has an inverted conical structure, and the wall thickness of the balloon A1 changes in a stepped manner. It can be clamped at the cervical opening of the uterine cavity and can also change the position of filling and expansion. The balloon A1 is V-shaped adapted to the internal os of the cervix and the cervical anatomy. At the same time, the wall thickness of the balloon A1 changes in a stepped manner. The deformation amount after filling at the thinner wall position is greater than that at the thicker wall position. In this way, the lateral expansion area of the balloon after filling is greater than the longitudinal expansion area, and the internal os of the cervix can be closed.

[0050] As a preferred solution, the balloon B2 has a cylindrical structure. Since the cervical canal is also cylindrical, it can be closed after filling. After the balloons A1 and B2 are filled, the internal os of the cervix and the cervical canal are closed, so that the liquid perfused into the uterine cavity can be kept in the uterine cavity for a long time to achieve the therapeutic effect and the assisted reproductive effect.

[0051] In this solution, the additional benefit brought by the fact that the balloons A1 and B2 share a closed channel is that the balloon catheter can be made thinner. The diameter of the tube body 3 is not greater than 3 mm. Thus, when the diameter is less than or equal to 3 mm, it can better extend into the cervical canal. This benefit also brings advantages to the later treatment, that is, the balloon catheter can be placed without cervical dilation for the patient in the later stage, the operation is more convenient, and the trauma to the patient is smaller.

[0052] When filling the two balloons through the closed channel, after the balloon B2 expands to a certain extent and tightly fits with the cervical canal to generate resistance, according to the principle of fluid mechanics, the fluid flows towards the direction with less resistance. So the subsequent input fluid rushes towards the balloon A1, causing it to expand laterally and close the internal os of the cervix. Therefore, this technical solution can achieve the clinical treatment purpose with a smaller input of fluid, thus avoiding the risk of postoperative cervical incompetence caused by excessive cervical dilation.

[0053] Embodiment 2, based on the solution of Embodiment 1, further, an adjustment tube 5 is sleeved on the front part of the tube body 3. The adjustment tube 5 is used to adjust the filling sequence of the balloons according to clinical needs. The adjustment tube 5 wraps the balloon A1 or the balloon B2 and is removed from the front end of the tube body 3 before the balloon catheter is inserted into the uterine cavity.

[0054] The adjustment tube 5 is a rigid hollow tube that can be sleeved on the balloon. When sleeved on the balloon, the gap between the adjustment tube 5 and the balloon is small. At the same time, the axial length of the adjustment tube 5 can completely cover the axial length of the balloon. Therefore, when the adjustment tube 5 is sleeved on one of the balloons and fluid is injected into the perfusion channel, the other balloon can be filled, while the sleeved balloon cannot be filled because it is fixed by the adjustment tube 5.

[0055] Since both balloons have a certain wall thickness, the outer diameter of the balloon is larger than that of the tube body 3 when the balloon is not filled. Therefore, when the adjustment tube 5 sleeves the balloon, it can be fixed at this position. When leaving the sleeved position, the adjustment tube 5 can slide freely on the tube body 3.

[0056] Due to the different conditions of the patients faced clinically, some patients have slender cervical canals. In this case, the anterior balloon A1 needs to be filled first, and the posterior balloon B2 is filled later to avoid over-expanding the cervix. For some patients with relatively thick cervical canals, the posterior balloon B2 needs to be filled first, and the anterior balloon A1 is filled later to ensure that the balloon in the cervical canal section can block the channel. Therefore, the design of the adjustment tube 5 provides a simple method for using the balloon catheter that can adjust the filling sequence of the balloons according to actual needs to meet this clinical requirement.

[0057] This specific embodiment describes a method for adjusting the filling sequence of the balloons according to clinical needs: Move the adjustment tube 5 to the balloon that is expected to be filled later, and inject a fluid into the closed channel through the injection joint 4. At this time, the balloon fixed by the adjustment tube 5 does not fill, and the fluid is driven to other balloons, causing the balloons to fill. Then, aspirate the closed channel, and the filled balloons are deflated by negative pressure aspiration. After the filling and deflation are completed for this time, the surface of the balloon is expanded and restored, and in the short term, the balloon obtains the structural advantage of being easy to fill. Therefore, when filling again, with the adjustment tube 5 removed, this balloon can ensure that it fills before other balloons, adjust the filling sequence of the balloons according to the actual situation, and place it in the uterine cavity for use.

[0058] Example 3, based on Example 1 or 2, please refer to Figures 3 to 6 , a blocking device 6 is sleeved on the rear part of the tube body 3. The blocking device 6 is slidably connected to the tube body 3 before uterine cavity perfusion and locks the tube body 3 after uterine cavity perfusion to seal the injected medium inside the tube body 3.

[0059] As a preferred solution, the blocking device 6 is an overall smooth curved surface body or circular structure to prevent discomfort to the patient when placed in the cervical canal or vagina.

[0060] The blocking device 6 includes a blocking ball A61 and a blocking ball B62. The blocking ball A61 and the blocking ball B62 can cooperate with each other to snap and fix the tube body 3.

[0061] On one side of the installation end face of the blocking ball A61, there is a fixing hook A611, which has a certain elasticity. On the other side of the installation end face of the blocking ball A61, there is a fixing groove A614. In the middle of the installation end face of the blocking ball A61, there is a blocking groove A617 for clamping the tube body 3.

[0062] The design structure of the blocking ball B62 is similar to that of the blocking ball A61. On one side of the installation end face of the blocking ball B62, there is a fixing groove B624 that cooperates with the fixing hook A611. On the other side of the installation end face of the blocking ball B62, there is a fixing hook B621 that cooperates with the fixing groove A614. In the middle of the installation end face of the blocking ball B62, there is a blocking groove B627 that cooperates with the blocking groove A617. When the two blocking grooves are clamped together, the pipe body 3 can be held.

[0063] In order to reflect that the blocking device 6 can move on the pipe body 3 and can lock the pipeline 3 when closed, the following design is carried out:

[0064] At the end of the fixing hook A611, there is a first cusp A612, and in the middle of the blocking ball A61, there is a first cusp B613; in the middle of the cavity of the fixing groove A614, there is a first fixing tooth groove A615, and at the bottom of the cavity of the fixing groove A614, there is a first fixing tooth groove B616; in the middle of the cavity of the fixing groove B624, there is a second fixing tooth groove A625 that cooperates with the first cusp B613, and at the bottom of the cavity of the fixing groove B624, there is a second fixing tooth groove B626 that cooperates with the first cusp A612. In the middle of the fixing hook B621, there is a second cusp B623 that cooperates with the first fixing tooth groove A615, and at the end of the fixing hook B621, there is a second cusp A622 that cooperates with the first fixing tooth groove B616.

[0065] Among them, for further explanation, the first cusp A612 and the second cusp A622 are both arranged inwardly and oppositely, and the first cusp B613 and the second cusp B623 are also arranged inwardly and oppositely. The positions of the fixing tooth grooves of the fixing groove A614 and the fixing groove B624 also need to be designed accordingly for adaptation.

[0066] Simply put, the blocking device 6 is composed of two semi-circular spheres A and B with the same shape. Inside the spheres, there are fixing hooks, fixing grooves, and blocking grooves. There is a cusp on the fixing hook, and in terms of shape, it can bite the two fixing tooth grooves in the fixing groove. When the blocking ball A61 faces the blocking ball B62, the fixing hook A611 can be placed into the fixing groove B624, and the first cusp A612 bites the second fixing tooth groove A625; at this time, the fixing hook B621 is also placed into the fixing groove A614, and the second cusp A622 bites the first fixing tooth groove A615. At this time, there is a certain gap between the blocking groove A617 on the blocking ball A61 and the blocking groove B627 on the blocking ball B62. The two spheres clamp the pipe body 3 with the blocking grooves, and the blocking device can slide between the injection joint 4 and the balloon on the pipe body 3 and can slide on the pipe body 3 without affecting the liquid passage inside the pipe body 3.

[0067] After completing intrauterine perfusion and balloon inflation and sealing, press the two hemispheres of the blocking device 6 towards each other. The first teeth A612 on the fixing hook A611 continue to move deeper into the fixing groove B624 and engage with the second fixing tooth groove B626 in the fixing groove B624; at the same time, the second teeth A622 on the fixing hook B621 continue to move deeper into the fixing groove A614 and engage with the first fixing tooth groove B616 in the fixing groove A614. At this time, the blocking groove gap between the blocking ball A61 and the blocking ball B62 is fixed to be very small, and the channel in the tube body 3 is flattened and does not have the ability to pass through. Therefore, when the second teeth A622 engage with the first fixing tooth groove B616 and the first teeth A612 engage with the second fixing tooth groove B626, the second teeth B623 also engage with the first fixing tooth groove A615, and the first teeth B613 also engage with the second fixing tooth groove A625. The advantage obtained is that the engagement at these four positions can completely block the channel and prevent the outflow of substances inside the uterine cavity. At this time, the tube body 3 between the blocking device 6 and the injection joint 4 can be cut, and the blocking device 6 can be left in the body.

[0068] Meanwhile, the balloon on the tube body 3 locks the internal os of the cervix and the cervical canal, the blocking device 6 locks the channel in the tube body 3, keeping the balloon in a filled state. At the same time, the smooth spherical ball will not scratch the tissue in the vagina. The injection joint 4 is cut to avoid contact between the tube body 3 extending from the uterus and the outside world, reducing the risk of infection and also helping to improve the patient's comfort.

[0069] In summary, it can be said that by using this balloon catheter, through the corresponding method of inflating the balloon, the outflow of substances inside the uterine cavity during perfusion can be effectively avoided, thereby effectively performing intrauterine perfusion treatment on the patient.

[0070] Example 4, based on the solutions of Examples 1 - 3, here also discloses a method for using a balloon catheter for intrauterine perfusion. Specifically, when implementing, it is carried out according to the following steps.

[0071] If clinically it is desired that the balloons be inflated in a sequential order, perform pretreatment first.

[0072] S01. Before inserting the balloon catheter, put the adjustment tube 5 on the balloon that is expected to be inflated later.

[0073] S02. Inject a fluid to inflate the balloon that is expected to be inflated first, and then deflate it to give the balloon that is expected to be inflated first the structural advantage of being inflated after receiving force.

[0074] S03. Remove the adjustment tube 5.

[0075] Regardless of whether pretreatment is performed or not, place the balloon catheter in the following way:

[0076] S1. Place the balloon and the tube body 3 into the uterine cavity, and confirm that balloon A1 is inside the internal orifice of the cervix and balloon B2 is inside the cervical canal.

[0077] S2. Inject the fluid through the second closed channel 41 into the first closed channel 31 via the injection connector 4. It is expected that the first balloon to be filled will be filled first. After the internal tension of the first balloon to be filled is greater than the injection fluid pressure, the fluid will enter the second balloon to be filled and fill it up.

[0078] S3. If no pretreatment is carried out, after balloon B2 is filled and wrapped by the cervical canal, it is affected by resistance, and it is difficult for the subsequent fluid to continue to be injected and is diverted to balloon A1, avoiding overexpansion of the cervical canal. When balloon A1 is filled, it expands laterally due to the gradient change of the wall thickness and blocks the internal orifice of the cervix.

[0079] S4. Inject the uterine cavity perfusion content into the first perfusion channel 32 through the second perfusion channel 42 by using the injection connector 4. Since both the cervical orifice and the cervical canal are blocked by balloon A1 and balloon B2, the uterine cavity perfusion content can be retained in the uterus for a long time.

[0080] S5. Move the blocking device 6 on the tube body 3 to an appropriate position, and press the blocking balls towards each other. The two fixed teeth on the two fixed teeth of blocking ball A61 bite into the two fixed tooth grooves in the fixed groove of blocking ball B62, and the two fixed teeth on blocking ball B62 bite into the two fixed tooth grooves in the fixed groove of blocking ball A61. The distance in the blocking groove is compressed, and the tube body 3 is squeezed and loses the liquid passing effect.

[0081] S6. Cut the tube body 3 between the blocking device 6 and the injection connector 4, and let the tube body 3 and the blocking device 6 be naturally placed in the vagina to avoid the risk of contact with the outside world and infection.

[0082] At this time, balloon A1 and balloon B2 block the internal orifice of the cervix and the cervical canal respectively, the blocking device 6 blocks the channel inside the tube body 3, and at the same time, the through sphere will not scratch the tissue in the vagina. The injection connector 4 is cut off to prevent the tube body 3 extending from the uterus from contacting the outside world to reduce the risk of infection. Since the end of the tube body 3 is located in the vagina, it will reduce the discomfort of contact with underwear and improve the comfort after the operation.

[0083] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. These unpublicized elements all belong to the prior art that can be known to those skilled in the art.

[0084] The specific embodiments described above further elaborate on the object, technical solution and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A balloon catheter for intrauterine perfusion, comprising a catheter body (3) and an injection connector (4). A second closed channel (41) and a second perfusion channel (42) which are arranged in a herringbone cross are provided in the injection connector (4). It is characterized in that: On the outer wall of the front part of the tube body (3), a balloon A (1) and a balloon B (2) are successively arranged. Inside the tube body (3), a first closed channel (31) connected to the second closed channel (41) is provided. The first closed channel (31) is communicated with the balloon A (1) and the balloon B (2) respectively through air outlet holes; the diameter of the tube body (3) is not greater than 3 mm.

2. The balloon catheter for intrauterine perfusion according to claim 1, wherein: The balloon A (1) has an inverted conical structure, and the wall thickness of the balloon A (1) changes in a stepped manner. The balloon B (2) has a cylindrical structure.

3. The balloon catheter for intrauterine perfusion according to claim 1, wherein: The rear end of the tube body (3) is connected to an injection joint (4). Inside the tube body (3), a first perfusion channel (32) connected to the second perfusion channel (42) is also provided. The end liquid outlet of the first perfusion channel (32) is located at the end of the tube body (3).

4. The balloon catheter for intrauterine perfusion according to claim 3, characterized in that: An adjustment tube (5) is sleeved on the front part of the tube body (3). The adjustment tube (5) is used to adjust the filling sequence of the balloons according to clinical needs; the adjustment tube (5) wraps the balloon A (1) or the balloon B (2) and is removed from the front end of the tube body (3) before uterine cavity perfusion.

5. A balloon catheter for intrauterine perfusion according to claim 4, characterized in that: A blocking device (6) is sleeved on the rear part of the tube body (3). The blocking device (6) is slidably connected to the tube body (3) before uterine cavity perfusion and locks the tube body (3) after uterine cavity perfusion, sealing the injected medium inside the tube body (3).

6. The balloon catheter for intrauterine perfusion according to claim 5, characterized in that: The blocking device (6) is integrally in a smooth curved surface body or circular structure.

7. A balloon catheter for intrauterine perfusion according to claim 5, characterized in that: The blocking device (6) includes a blocking ball A (61) and a blocking ball B (62). On one side of the installation end face of the blocking ball A (61), a fixing hook A (611) is provided. On the other side of the installation end face of the blocking ball A (61), a fixing groove A (614) is provided. In the middle of the installation end face of the blocking ball A (61), a blocking groove A (617) is provided; on one side of the installation end face of the blocking ball B (62), a fixing groove B (624) matching with the fixing hook A (611) is provided. On the other side of the installation end face of the blocking ball B (62), a fixing hook B (621) matching with the fixing groove A (614) is provided. In the middle of the installation end face of the blocking ball B (62), a blocking groove B (627) matching with the blocking groove A (617) is provided.

8. The balloon catheter for intrauterine perfusion according to claim 7, characterized in that: At the end of the fixing hook A (611), a first tooth A (612) is provided. In the middle of the blocking ball A (61), a first tooth B (613) is provided; in the middle of the cavity of the fixing groove A (614), a first fixing tooth groove A (615) is provided. At the bottom of the cavity of the fixing groove A (614), a first fixing tooth groove B (616) is provided; in the middle of the cavity of the fixing groove B (624), a second fixing tooth groove A (625) matching with the first tooth B (613) is provided. At the bottom of the cavity of the fixing groove B (624), a second fixing tooth groove B (626) matching with the first tooth A (612) is provided; in the middle of the fixing hook B (621), a second tooth B (623) matching with the first fixing tooth groove A (615) is provided. At the end of the fixing hook B (621), a second tooth A (622) matching with the first fixing tooth groove B (616) is provided.

9. The method of using a balloon catheter for intrauterine perfusion according to any one of claims 1-8, characterized in that, The following usage steps are adopted: S1. Place the balloon and the tube body (3) into the uterine cavity, and confirm that balloon A (1) is inside the internal orifice of the cervix and balloon B (2) is inside the cervical canal; S2. Inject the fluid through the second closed channel (41) into the first closed channel (31) via the injection adapter (4). It is expected that the first balloon to be filled will be filled first. After the internal tension of the first balloon to be filled is greater than the injection fluid pressure, the fluid will enter the second balloon to be filled and fill it up; S3. If no pretreatment is carried out, after balloon B (2) is filled and wrapped by the cervical canal, it will be affected by resistance, and it will be difficult for the subsequent fluid to continue to be injected and will be diverted to balloon A (1). When balloon A (1) is filled, it will expand laterally due to the gradient change of the wall thickness and block the internal orifice of the cervix; S4. Inject the uterine cavity perfusion content into the first perfusion channel (32) via the second perfusion channel (42) using the injection adapter (4); S5. Move the blocking device (6) on the tube body (3) to an appropriate position, press the blocking balls against each other. The two fixed teeth on the blocking ball A (61) bite into the two fixed tooth grooves in the fixed slot of the blocking ball B (62), and the two fixed teeth on the blocking ball B (62) bite into the two fixed tooth grooves in the fixed slot of the blocking ball A (61). The distance in the blocking slot is compressed, and the tube body (3) is squeezed and loses the fluid passing effect; S6. Cut the tube body (3) between the blocking device (6) and the injection adapter (4), and let the tube body (3) and the blocking device (6) be naturally placed in the vagina.

10. The method for using a balloon catheter for intrauterine perfusion according to claim 9, characterized in that: In step S3, when pretreatment is required, the pretreatment is carried out before the balloon catheter is placed in the uterine cavity. The pretreatment includes the following steps: S01. Before placing the balloon catheter, put the adjustment tube (5) on the balloon that is expected to be filled later; S02. Inject the fluid to fill the balloon that is expected to be filled first, and then deflate it to make the balloon that is expected to be filled first gain the structural advantage of being filled after being stressed; S03. Remove the adjustment tube (5).

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