Pushing rod and pushing system of balloon uterine stent

Abstract

The invention relates to the technical field of medical instruments, and discloses a pushing rod and a pushing system of a balloon uterine stent.The pushing rod of the balloon uterine stent comprises a pushing rod and a cylindrical part formed at one end of the pushing rod, and the cylindrical part extends in the extending direction of the pushing rod; a cavity capable of allowing a balloon of the balloon uterine stent to be placed after being rolled is formed in the cylindrical part, the cavity extends in the radial direction of the cylindrical part to be connected with the side wall face of the cylindrical part, and a first opening is formed in the connection position; the pushing system of the balloon uterine stent comprises the pushing rod. According to the pushing rod and the pushing system of the balloon uterus stent, the inverted-cone-shaped curled balloon with the complex contour is prevented from making contact with the vaginal wall, the implantation operation of the balloon is smoother, due to the fact that the balloon is curled to be placed in the cavity, the balloon can be separated from the pushing rod in the expansion process, and the balloon is prevented from being damaged. And the risk that the balloon deviates due to the fact that the pushing rod continues to interfere with the balloon is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a pushing rod and a pushing system of a balloon uterine stent. Background Art

[0002] The balloon uterine stent is a medical device mainly composed of a balloon and a catheter used to introduce liquid into the balloon to expand the balloon. It is usually made of materials that meet biocompatibility requirements, such as medical silicone.

[0003] After some intrauterine surgeries, such as abortion and hysteroscopic surgery, the doctor will insert it into the uterine cavity through the vagina and inject an appropriate amount of saline or other liquids to expand the balloon. On the one hand, it is used to prevent intrauterine adhesions and reduce the chance of adhesions by separating the uterine wall; on the other hand, it can also promote endometrial repair, provide a good space environment for the growth of the endometrium, and help the damaged endometrium recover. During use, patients need to have regular checkups so that doctors can observe the position of the stent and the recovery of the uterus, and remove the stent when appropriate.

[0004] Since the vagina is a relatively narrow passage, and the balloon of the balloon uterine stent is in the shape of an inverted pear, it is difficult to insert the balloon uterine stent. Therefore, in order to smoothly insert the balloon uterine stent, the prior art proposes to roll up the balloon and insert it into the uterus. For example, Chinese patent CN109771799B discloses a balloon uterine stent and a method for pushing a uterine balloon, such as Figure 1 The patent proposes to set ears e on both sides of the balloon a, first hang the ear e on one side on the end d of the push rod b, and then curl the balloon a along the circumference of the push rod, and then hang the ear e on the other side on the end d of the push rod b, so that after the balloon e is curled on the push rod, the balloon is placed into the uterus with the push rod, and then physiological saline is injected into the balloon a to expand the balloon a, so that the ear e is forced to separate from the end d;

[0005] This solution has certain drawbacks:

[0006] First, due to the shape of the balloon, the balloon is in an inverted cone shape after being rolled up, with the head expanded and the tail contracted, which is not ergonomic. In addition, the outer contour of the balloon after being rolled up is complex and not a smooth structure. When inserted, the friction between the balloon and the vaginal wall is large, which hinders the insertion process.

[0007] Secondly, in order to prevent the balloon from detaching from the push rod during the pushing process, the ear must form a certain elastic tightening effect on the end of the push rod. However, experiments have found that when normal saline is injected into the balloon, the expansion effect of the balloon is not enough to counteract the elastic tightening effect of the ear, resulting in the ear not being able to detach from the push rod smoothly. When the push rod is withdrawn, the balloon will deviate, and the balloon will not be able to play a good role. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a push rod for a balloon uterine stent.

[0009] Another object of the present invention is to provide a balloon uterine stent pushing system.

[0010] The push rod of the balloon uterine stent proposed in the present invention comprises a push rod and a columnar member formed at one end of the push rod, the columnar member extends along the extension direction of the push rod, and a cavity is formed on the columnar member for the balloon of the balloon uterine stent to be placed after being rolled up;

[0011] The advantage of such a setting is that the cavity on the columnar member is used to accommodate the balloon of the balloon uterine stent, and then the push rod is used to push the balloon into the uterus along with the cavity. Then, the shape of the balloon after curling can be limited by the shape of the cavity, and the surface in contact with the vaginal wall is the wall surface of the columnar member. The shape of the columnar member can be designed to adapt to the ergonomic shape of the vagina, and the wall surface of the columnar member can be a smooth wall surface, which avoids the contact between the inverted cone-shaped, complex contour curled balloon and the vaginal wall, making the balloon insertion operation smoother.

[0012] Furthermore, the cavity extends along the radial direction of the columnar member until it is connected with the side wall surface of the columnar member, and a first opening is formed at the connection point;

[0013] The purpose of setting the first opening is that: after the balloon is placed into the uterus along with the push rod, liquid is filled into the balloon to make it expand and overflow from the cavity, and then detach from the push rod through the first opening, and then the push rod is withdrawn from the body. During this process, since the balloon and the push rod are not directly connected, but are curled and placed in the cavity, the expansion process is sufficient to make the balloon detach from the cavity through the first opening, thereby avoiding the risk of the push rod continuing to interfere with the balloon and causing the balloon to deviate.

[0014] In some examples of the present invention, circular chamfers are formed at the joints between the edge of the first opening and the wall of the cavity and the side wall of the columnar member, respectively. The chamfers allow the first opening to have a smooth joint with the wall of the cavity and the side wall of the columnar member, respectively, thereby avoiding damage to the balloon at the corners, helping the balloon to escape from the cavity, and ensuring that the tissue is not damaged when the push rod withdraws from the uterus.

[0015] In some examples of the present invention, the cavity extends along the axial direction of the cylindrical member to the junction with the push rod to form a second opening;

[0016] The purpose of setting the second opening is that the second opening serves as an entrance when the balloon is placed into the cavity. The second opening allows the curled balloon to enter the cavity along its own axis. In addition, the catheter can pass through the second opening to connect with the balloon.

[0017] In some examples of the present invention, the edge of the second opening forms a guide slope from the end connected with the push rod to the end connected with the first opening;

[0018] The purpose of setting the guide slope is to gradually guide the balloon by the guide slope during the process of inserting it into the cavity, so that it can be inserted more conveniently and smoothly, and it can also ensure that the push rod will not damage the tissue when it withdraws from the uterus.

[0019] In some examples of the present invention, one end of the cavity away from the second opening is closed, and the closed end is used to prevent the balloon from moving in the cavity and detaching from the columnar member, and it is also convenient to set a structure suitable for insertion into the vaginal wall at the closed end.

[0020] In some examples of the present invention, a guide head is formed on the columnar member extending from the closed end of the cavity, and the guide head tends to shrink along the direction of its extension; the contraction structure of the guide head is consistent with the action of being inserted into a narrow channel, ensuring that the instrument enters the uterus and slowly expands the cervix from small to large, and pushes the entire instrument into place, ensuring that it can be smoothly advanced and reducing the patient's pain.

[0021] In some examples of the present invention, a smooth curved surface is formed on the guide head, and the smooth curved surface is smoothly connected with the side wall surface of the columnar member; the smooth curved surface can reduce interference with the vaginal wall and alleviate the patient's discomfort.

[0022] In some examples of the present invention, the push rod and the cavity are connected by a smooth bevel, and the smooth bevel is used to enhance the strength between the push rod and the columnar member to ensure a stable connection between the two.

[0023] In some examples of the present invention, a catheter groove is formed in the middle of the push rod, and the catheter groove is used to fix the catheter of the balloon uterine stent, so as to facilitate its placement into the uterus together with the push rod.

[0024] The pushing system of the balloon uterine stent according to the present invention comprises the pushing rod of the balloon uterine stent described above, and also comprises a balloon assembly, wherein the balloon assembly comprises a balloon and a catheter connected to the balloon, and a one-way valve is arranged at one end of the catheter away from the balloon;

[0025] The catheter is used to introduce saline solution into the balloon to expand it, and the one-way valve is used to prevent the saline solution from flowing back. The balloon uterine stent in this pushing system cancels the ear design and still uses the traditional balloon uterine stent. Therefore, when using the pushing rod of the balloon uterine stent, the balloon uterine stent does not need to be specially used as a supporting device, and even the balloon uterine stent with ears can also be used.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the structure of a balloon uterine stent disclosed in patent CN109771799B in the background technology of the present invention;

[0029] Figure 2 It is a front view of the balloon uterine stent in an embodiment of the present invention;

[0030] Figure 3 A three-dimensional diagram of a push rod in an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a capsule in a curled state in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a state where a balloon is rolled up in a cavity in an embodiment of the present invention;

[0033] Figure 6 is a cross-sectional view of the push rod at AA in an embodiment of the present invention;

[0034] Figure 7 This is a detailed view of the push rod at position B in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] Balloon uterine stent 100, balloon 110, catheter 120, one-way valve 130;

[0037] Push rod 200;

[0038] Push rod 210, smooth inclined surface 211;

[0039] Columnar member 220, cavity 221, wall surface 221-1 of the cavity, closed end surface 221-2, side wall surface 222 of the columnar member, first opening 223, edge side 223-1 of the first opening, rounded chamfer 223-2, second opening 224, edge side 224-1 of the second opening, guide slope surface 224-2, guide head 225, smooth curved surface 225-1;

[0040] C-shaped piece 230 , catheter groove 231 . DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] Reference below Figure 2-Figure 7 The figure shows a balloon uterine stent pushing system according to an embodiment of the present invention.

[0046] For details, please see the attached Figure 2 ~Attached Figure 3, which are respectively a front view of the balloon uterine stent 100 and a stereoscopic view of the pushing rod 200. The pushing system of the balloon uterine stent 100 includes the balloon uterine stent 100 and the pushing rod 200, wherein the balloon 110 in the balloon uterine stent 100 is temporarily fixed on the pushing rod 200 after being curled, and then inserted into the uterus with the pushing rod 200, and physiological saline is filled into the balloon 110 to expand it, and then the pushing rod 200 is withdrawn to complete the insertion operation of the balloon uterine stent 100.

[0047] Please continue to see the attached Figure 2 The balloon uterine stent 100 includes a balloon 110 and a catheter 120 connected to the balloon 110, and a one-way valve 130 is provided at one end of the catheter 120 away from the balloon 110;

[0048] Please continue to see the attached Figure 2 The balloon 110 is triangular or pear-shaped to adapt to the shape of the uterus. It is made of silicone and has a cavity formed inside. The cavity can be filled with saline to expand the balloon. The expansion can effectively prevent postoperative uterine adhesion. The contracted end of the balloon 110 is connected to one end of the catheter 120, and the other end of the catheter 120 is connected to the one-way valve 130. The catheter 120 is used to introduce saline into the balloon. After the balloon is expanded, the one-way valve 130 is used to prevent the saline from flowing back.

[0049] Please see attached Figure 4 , is a schematic diagram of the balloon uterine stent 100 in a curled state. During the insertion process, the balloon 110 should be in a Figure 4 The state shown is to enter the uterus via the vagina. The balloon 110 has a smaller diameter in the curled state, which is ergonomic and easier to insert.

[0050] Please continue to see the attached Figure 3 The push rod 200 includes a push rod 210 and a columnar member 220 formed at one end of the push rod 210, wherein the push rod 210 plays a role of extension and advancement, and its length is equivalent to that of the catheter 120, and the columnar member 220 is cylindrical, extending along the extension direction of the push rod 210, and is integrally formed with the push rod 210, and the diameter of the push rod 210 is smaller than the diameter of the columnar member 220

[0051] Please continue to see the attached Figure 3 The columnar member 220 is provided with a cavity 221 into which the balloon 110 of the balloon uterine stent 100 can be placed after being rolled up. The cavity 221 is a cylindrical cavity, which extends along the extension direction of the columnar member 220 and has a length that can accommodate the rolled up balloon 110. Specifically, the state of the balloon 110 rolled up in the cavity 221 is as follows: Figure 5 As shown, during assembly, the balloon 110 is crimped and assembled onto the push rod 200, as shown in FIG. Figure 5As shown, at this time, the balloon 110 together with the pushing rod 200 can be pushed into the uterus without dilating the uterus. When pushed into place, a clinically predetermined dissolved liquid is injected into the balloon 110 through the catheter 120. After a certain amount of liquid is injected, the balloon 110 is expanded and popped out from the pushing rod 200. At this time, the pushing rod 200 can be withdrawn from the uterus, thereby achieving the purpose of quickly and effectively placing the balloon uterine stent 100 without dilating the uterus, reducing the patient's pain and operation time caused by dilating the uterus.

[0052] Please see attached Figure 6 , is a cross-sectional view of the push rod 200 at AA, the cavity 221 extends along the radial direction F of the columnar member 220 to connect with the side wall surface 222 of the columnar member 220, and forms a first opening 223 at the connection, and the first opening 223 also extends along the extension direction of the columnar member 220, presenting a strip-shaped opening;

[0053] Please continue to see the attached Figure 3 The width D of the first opening 223 is smaller than the diameter R of the cavity 221. When the balloon 110 in the cavity 221 expands, it can be separated from the cavity 221 through the first opening 223. At the same time, the cavity 221 can basically wrap the curled balloon 110 so that its state in the balloon 110 is basically fixed.

[0054] Please see attached Figure 7 ,for Figure 3 In the detail diagram at point B, the edge side 223-1 of the first opening 223 forms a circular chamfer 223-2 at the connection with the wall surface 221-1 of the cavity 221 and the side wall surface 222 of the columnar member 220. The circular chamfer 223-2 allows the edge side 223-1 of the first opening 223 to have a smooth connection, so that the push rod 200 will not damage the tissue when withdrawing from the uterus.

[0055] Please continue to see the attached Figure 3 , Attachment Figure 6 The cavity 221 extends along the axial direction L of the columnar member 220 to the connection with the push rod 210 to form a second opening 224. The second opening 224 connects the connection between the columnar member 220 and the push rod 210, and the second opening 224 is also connected to the first opening 223. The curled balloon 110 needs to be placed in the cavity 221 through the second opening 224.

[0056] Please continue to see the attached Figure 3 , Attachment Figure 6 The edge 224-1 of the second opening 224 forms a guide slope 224-2 from the end connected with the push rod 210 to the end connected with the first opening 223. The guide slope 224-2 makes the connection between the edge 224-1 of the second opening 224 and the push rod 210 a smooth structure without obvious corners, and is also used to prevent the push rod 200 from damaging tissue when withdrawing from the uterus.

[0057] Please continue to see the attached Figure 7 The guide slope 224 - 2 is connected with the wall 221 - 1 of the cavity 221 and the side wall 222 of the columnar member 220 in an arc-shaped manner, which is also used to avoid damaging the uterus.

[0058] Please continue to see the attached Figure 3 , Attachment Figure 6 One end of the cavity 221 away from the second opening 224 is closed, and a closed end surface 221 - 2 is formed at the closed end. The closed end surface 221 - 2 is used to limit the balloon 110 placed in the cavity 221 to prevent the balloon 110 from jumping out of the cavity 221 .

[0059] Please continue to see the attached Figure 3 , Attachment Figure 6 A guide head 225 is formed on the columnar member 220 and extends from the closed end of the cavity 221. The guide head 225 tends to shrink along the direction in which it extends. Specifically, the guide head 225 is in the shape of a bullet head, which is conducive to the insertion operation into the vaginal wall.

[0060] Please continue to see the attached Figure 3 , Attachment Figure 6 The guide head 225 forms a smooth curved surface 225 - 1 , and the smooth curved surface 225 - 1 is smoothly connected with the side wall surface 222 of the columnar member 220 .

[0061] Please continue to see the attached Figure 3 The push rod 210 and the cavity 221 are connected by a smooth inclined surface 211 .

[0062] Please continue to see the attached Figure 3 A catheter groove 231 is formed in the middle of the push rod 210 , and the catheter groove 231 is formed by a C-shaped piece 230 fixed on the push rod 210 , which is used to fix the catheter 120 .

[0063] Other components of the pushing system of the balloon uterine stent according to the embodiment of the present invention, such as a one-way valve and the like, and operations are known to those skilled in the art and will not be described in detail here.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. The push rod of the balloon uterine stent is characterized by: It includes a push rod and a columnar member formed at one end of the push rod, wherein the columnar member extends along the extension direction of the push rod, and a cavity is formed on the columnar member for inserting a balloon of a balloon uterine stent after being rolled up, and the cavity extends along the radial direction of the columnar member to connect with the side wall surface of the columnar member, and a first opening is formed at the connection.

2. The push rod of the balloon uterine stent according to claim 1, characterized in that: The edges of the first opening respectively form circular chamfers at the joints with the wall surface of the cavity and the side wall surface of the columnar member.

3. The push rod of the balloon uterine stent according to claim 1 or 2, characterized in that: The cavity extends along the axial direction of the columnar member to a position where it connects with the push rod to form a second opening.

4. The pushing rod of the balloon uterine stent according to claim 3, characterized in that: The edge side of the second opening forms a guide slope from the end connected with the push rod to the end connected with the first opening.

5. The pushing rod of the balloon uterine stent according to claim 3, characterized in that: One end of the cavity away from the second opening is closed.

6. The pushing rod of the balloon uterine stent according to claim 5, characterized in that: A guide head is formed on the columnar member and extends from the closed end of the cavity, and the guide head tends to shrink along the direction in which it extends.

7. The pushing rod of the balloon uterine stent according to claim 6, characterized in that: A smooth curved surface is formed on the guide head, and the smooth curved surface is smoothly connected with the side wall surface of the columnar member.

8. The pushing rod of the balloon uterine stent according to claim 1 or 2, characterized in that: The push rod is connected to the cavity by a smooth inclined surface.

9. The push rod of the balloon uterine stent according to claim 1 or 2, characterized in that: A guide tube groove is formed in the middle of the push rod.

10. A balloon uterine stent push system, characterized in that: The invention comprises a pushing rod of the balloon uterine stent according to any one of claims 1 to 9, and also comprises a balloon uterine stent, wherein the balloon uterine stent comprises a balloon and a catheter connected to the balloon, and a one-way valve is arranged at one end of the catheter away from the balloon.

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