Puncture synchronous dilator

Abstract

The utility model relates to the field of medical instruments, and provides a puncture synchronous dilator which comprises an inner dilation tube, a plurality of outer dilation tubes, a tearable sheathing canal and a Y valve, the inner dilation tube is provided with an inlet end and an outlet end, the outer dilation tubes are sequentially arranged on the outer surface of the inner dilation tube, and the tearable sheathing canal is arranged on the outer surface of the outer dilation tube on the outermost layer. And the Y valve is detachably mounted at the inlet end. The multiple outer expansion pipes are sequentially arranged on the outer surface of the inner expansion pipe, the inner expansion pipe is firstly inserted into the preset position, then the preset position can be gradually expanded only by sequentially moving the outer expansion pipes with different diameters until the requirement is met, dilators with different diameters do not need to be replaced in the process, and the expansion efficiency is improved. Therefore, the guide wire can be prevented from falling off, and the risk of operation failure is reduced.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a puncture synchronous dilator. Background Art

[0002] Traditional surgical methods for hepatobiliary stones, such as liver resection and choledochojejunostomy, are not only highly invasive and require strict physical conditions for high-risk patients, but are also prone to recurrence after surgery. Furthermore, abdominal adhesions during further surgery increase the difficulty and risk of surgery. Therefore, exploring safer and more effective treatments is crucial.

[0003] Percutaneous transhepatic biliary lithotripsy (PTCSL) is a minimally invasive procedure that effectively removes bile duct stones by puncturing the intrahepatic bile duct externally to establish an operative channel. Using a choledochoscope and various lithotripsy techniques, it significantly reduces surgical trauma and the risk of postoperative recurrence. However, current PTCSL procedures, particularly the key steps of bile duct puncture and dilation, remain deficient.

[0004] Specifically, after bile duct puncture and guidewire insertion in traditional one-step or two-step PTCSL surgery, the bile duct needs to be gradually expanded to the desired size by replacing dilators of different sizes multiple times. This process is not only cumbersome and time-consuming, but frequent replacement of dilators can easily cause the guidewire to fall off, increasing the risk of surgical failure. Utility Model Content

[0005] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and provide a puncture synchronous dilator.

[0006] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0007] This application provides:

[0008] A puncture synchronous dilator, comprising:

[0009] an inner expansion tube having an inlet end and an outlet end;

[0010] A plurality of outer expansion tubes, wherein the outer expansion tubes are sequentially arranged on the outer surface of the inner expansion tube;

[0011] A tearable sheath, the tearable sheath being arranged on the outer surface of the outer expansion tube as the outermost layer;

[0012] A Y-valve is detachably mounted on the inlet end.

[0013] Furthermore, a first connecting structure is provided between the inner expansion tube and the Y-valve, and the inner expansion tube and the Y-valve are detachably connected through the first connecting structure. The first connecting structure includes a first thread provided at the end of the inner expansion tube near the direction of the Y-valve, and the Y-valve is provided with a second thread adapted to the first thread near the end of the inner expansion tube in the direction of the inner expansion tube.

[0014] Furthermore, the inner expansion tube includes a first tube body and a second tube body, and the first tube body and the second tube body are detachably connected.

[0015] Furthermore, a second connecting structure is provided between the first tube body and the second tube body, and the first tube body and the second tube body are detachably connected through the second connecting structure. The second connecting structure includes a third thread opened at the end of the first tube body close to the second tube body, and a fourth thread adapted to the third thread is opened at the end of the second tube body close to the first tube body.

[0016] Furthermore, the third thread is an external thread, and the fourth thread is an internal thread;

[0017] Alternatively, the third thread is an internal thread, and the fourth thread is an external thread.

[0018] Furthermore, the tearable sheath comprises a tear tube, a hand-held portion is provided at the end of the tear tube, and a tear groove is axially provided on the outer surface of the tear tube.

[0019] Furthermore, the tear tube is provided with a scale.

[0020] Furthermore, the Y-valve includes a main pipe detachably connected to the inner expansion tube, a secondary pipe is obliquely arranged on the outer surface of the main pipe, a first connecting cavity is opened inside the main pipe along the axial direction, and a second connecting cavity is opened inside the secondary pipe along the axial direction, and the first connecting cavity is connected to the second connecting cavity.

[0021] Furthermore, the inner expansion tube is cylindrical and hollow, and the outlet end is conical.

[0022] Furthermore, gaps are defined between the outer expansion tube and the inner expansion tube, between adjacent outer expansion tubes, and between the outermost outer expansion tube and the tearable sheath tube.

[0023] In the present application, multiple outer expansion tubes are sequentially arranged on the outer surface of the inner expansion tube. The inner expansion tube is first inserted into the preset position, and then the preset position can be gradually expanded by moving the outer expansion tubes of different diameters in sequence until the needs are met. During this process, there is no need to replace expanders of different diameters, thereby preventing the guide wire from falling off and reducing the risk of surgical failure.

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 Shown is a schematic diagram of the structure of the puncture synchronous dilator of the present application;

[0027] Figure 2 A schematic diagram showing the connection state of the expansion tube and the Y valve in this application is shown;

[0028] Figure 3 A schematic diagram of a cross-sectional view of the expansion tube and the Y-valve in this application is shown;

[0029] Figure 4 A schematic diagram of the tearable sheath structure of the present application is shown;

[0030] Figure 5 Shows a schematic diagram of the Y-valve structure of the present application;

[0031] Figure 6 A schematic diagram showing the sequential expansion states of external expansion tubes of different sizes in the present application is shown.

[0032] Description of main component symbols:

[0033] 100, inner expansion tube; 110, first tube body; 120, second tube body; 200, outer expansion tube; 300, tearable sheath; 310, tear tube; 320, tear groove; 330, hand-held part; 400, Y-valve; 410, main tube; 420, auxiliary tube; 430, first connecting cavity; 440, second connecting cavity; 500, first connecting structure; 510, first thread; 520, second thread; 600, second connecting structure; 610, third thread; 620, fourth thread. DETAILED DESCRIPTION

[0034] The following describes in detail embodiments of the present application. Examples of the embodiments 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 application and are not to be construed as limiting the present application.

[0035] In the description of the present application, 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0037] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0038] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0039] In the related art, bile duct puncture usually requires dilators of different sizes to expand to the required size. When replacing dilators of different sizes, the guide wire is likely to fall off, increasing the risk of surgical failure. In order to solve this problem, the present application sets outer dilator tubes 200 of different sizes on the outer surface of the inner dilator tube 100, and the outer dilator tube 200 can move axially compared to the inner dilator tube 100. The inner dilator tube 100 is first inserted into a preset position through the guide wire, and then the outer dilator tubes 200 of different diameters are moved in turn to expand the surrounding skin and tissue to form a channel for removing bile duct stones, thereby expanding the channel to the required size.

[0040] The present application provides a puncture synchronous dilator, including an inner dilator 100, several outer dilator tubes 200, a tearable sheath 300 and a Y-valve 400. The inner dilator 100 has an inlet end and an outlet end. Several outer dilator tubes 200 are sequentially arranged on the outer surface of the inner dilator 100. The tearable sheath 300 is arranged on the outer surface of the outermost layer of the outer dilator tube 200. The Y-valve 400 is detachably installed on the inlet end.

[0041] See Figure 1 and Figure 2 As shown, when the inner expansion tube 100 reaches the predetermined position, the outer expansion tube 200 with a gradually increasing diameter can be moved in sequence to gradually expand the skin and tissue around the puncture point. The detailed process can be referred to Figure 6 As shown, a channel for stone removal is formed, and finally the tearable sheath 300 also moves to achieve expansion around the puncture point, and after the tearable sheath 300 completes expansion, the inner expansion tube 100 and several outer expansion tubes 200 with gradually increasing diameters can be taken out in turn, and finally a surgical channel is established through the tearable sheath 300, that is, a stone removal channel is established, and then the corresponding stone removal instrument can be used to perform stone removal operations through the channel, and finally a drainage tube is inserted through the tearable sheath 300, and the drainage tube is connected to the drainage bag, and drainage operations are performed through the drainage tube, and then the tearable sheath 300 is torn and taken out to complete the operation.

[0042] In the above operation, it is impossible to directly verify whether the inner expansion tube 100 has reached the position. Therefore, after the inner expansion tube 100 is placed along the guide wire, the inner expansion tube 100 can be connected to the Y-valve 400, and liquid can be extracted through the Y-valve 400 to determine whether the inner expansion tube 100 has entered the bile duct.

[0043] Continue reading Figure 1 and Figure 2 As shown, the inner expansion tube 100 is cylindrical and hollow, and the outlet end is tapered.

[0044] The inner expansion tube 100 is in the shape of a circular tube. The hollow structure of the inner expansion tube 100 cooperates with the Y-valve 400 to extract liquid to determine whether the inner expansion tube 100 has reached the preset position; the outlet end of the inner expansion tube 100 is conical, which can better enter the preset position and reduce the resistance encountered.

[0045] Gaps are defined between the outer expansion tube 200 and the inner expansion tube 100 , between adjacent outer expansion tubes 200 , and between the outermost outer expansion tube 200 and the tearable sheath 300 .

[0046] When the outer expansion tube 200 and the tearable sheath 300 move along the axial direction of the inner expansion tube 100, in order to make the outer expansion tube 200 and the tearable sheath 300 move more smoothly, that is, when moving, there is no friction or very little friction between the inner expansion tube 100 and the innermost outer expansion tube 200, between adjacent outer expansion tubes 200, and between the outermost outer expansion tube 200 and the tearable sheath 300, so that a gap is formed between the inner expansion tube 100 and the innermost outer expansion tube 200, and gaps should also be formed between adjacent outer expansion tubes 200. Furthermore, in order to facilitate the movement of the tearable sheath 300, a gap is also formed between the outermost outer expansion tube 200 and the tearable sheath 300. It should be noted here that the gap mentioned here can be understood as the gap fit between the inner expansion tube 100 and the innermost outer expansion tube 200, the gap fit between two adjacent outer expansion tubes 200, and the gap fit between the outermost outer expansion tube 200 and the tearable sheath 300.

[0047] A first connecting structure 500 is provided between the inner expansion tube 100 and the Y-valve 400. The inner expansion tube 100 and the Y-valve 400 are detachably connected through the first connecting structure 500. The first connecting structure 500 includes a first thread 510 provided at the end of the inner expansion tube 100 near the direction of the Y-valve 400. The Y-valve 400 is provided with a second thread 520 adapted to the first thread 510 near the end of the inner expansion tube 100.

[0048] See Figure 1 、 Figure 3 and Figure 5 As shown, in order to achieve quick connection and disassembly between the inner expansion tube 100 and the Y-valve 400, a first thread 510 is provided at the end of the inner expansion tube 100, and a second thread 520 is provided on the Y-valve 400, that is, the inner expansion tube 100 and the Y-valve 400 are threadedly connected by the first thread 510 and the second thread 520 to achieve quick disassembly.

[0049] For example, the first thread 510 can be an internal thread or an external thread, and the second thread 520 can also be an internal thread or an external thread. Specifically, when the first thread 510 is an internal thread, the second thread 520 is an external thread, and when the first thread 510 is an external thread, the second thread 520 is an internal thread.

[0050] The inner expansion tube 100 includes a first tube body 110 and a second tube body 120 , and the first tube body 110 and the second tube body 120 are detachably connected.

[0051] A second connecting structure 600 is provided between the first tube body 110 and the second tube body 120, and the first tube body 110 and the second tube body 120 are detachably connected through the second connecting structure 600. The second connecting structure 600 includes a third thread 610 opened at the end of the first tube body 110 close to the second tube body 120, and a fourth thread 620 adapted to the third thread 610 is opened at the end of the second tube body 120 close to the first tube body 110.

[0052] See Figure 3 As shown, the puncture depths of different individuals are different. In order to meet the needs of different individuals, the inner expansion tube 100 is divided into two, that is, the inner expansion tube 100 is divided into a first tube body 110 and a second tube body 120, and the first tube body 110 and the second tube body 120 can be disassembled and connected. Specifically, a third thread 610 is provided at the end of the first tube body 110, and a fourth thread 620 is provided at the end of the second tube body 120, that is, the third thread 610 and the fourth thread 620 are threadedly connected to realize the rapid disassembly and assembly of the first tube body 110 and the second tube body 120.

[0053] Continue reading Figure 3 As shown, the first thread 510 is provided at the end of the second tube body 120 away from the first tube body 110 .

[0054] In this embodiment, the third thread 610 and the fourth thread 620 can both be internal threads or external threads. Specifically, if the third thread 610 is an external thread, the fourth thread 620 is an internal thread; or, if the third thread 610 is an internal thread, the fourth thread 620 is an external thread.

[0055] The tearable sheath 300 includes a tear tube 310 , a handle portion 330 is provided at the end of the tear tube 310 , and a tear groove 320 is axially opened on the outer surface of the tear tube 310 .

[0056] See Figure 4As shown, in order to facilitate the rapid removal of the tearable sheath 300 from the puncture point, according to the characteristics of the tearable sheath 300 itself, when removing it, it is only necessary to use the fingers of both hands to clamp the two hand-held parts 330 and separate them from each other. As the tearing force acting on the hand-held parts 330 increases, the tear tube 310 is torn at the position of the tear groove 320, and the tear tube 310 can be removed from the puncture point while being torn.

[0057] In order to visually see the depth of the tear tube 310 , a scale (not shown) is provided on the tear tube 310 . Specifically, the scale can be provided on the inner wall of the tear tube 310 , and the tear tube 310 can be made of a transparent material.

[0058] The Y-valve 400 includes a main pipe 410 that is detachably connected to the inner expansion tube 100, and a secondary pipe 420 is obliquely arranged on the outer surface of the main pipe 410. A first connecting cavity 430 is opened in the axial direction inside the main pipe 410, and a second connecting cavity 440 is opened in the axial direction inside the secondary pipe 420. The first connecting cavity 430 is connected to the second connecting cavity 440.

[0059] See Figure 5 As shown, the first connecting cavity 430 is for the guide wire to pass through. In order to facilitate the extraction of liquid to determine whether the inner expansion tube 100 has reached the preset position, the liquid can be extracted through the second connecting cavity 440 by means of a syringe or other components.

[0060] In this embodiment, the second thread 520 is disposed at the end of the main tube 410 close to the second tube body 120 .

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0062] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A puncture synchronous dilator, characterized in that: include: an inner expansion tube (100), the inner expansion tube (100) having an inlet end and an outlet end; A plurality of outer expansion tubes (200), wherein the plurality of outer expansion tubes (200) are sequentially arranged on the outer surface of the inner expansion tube (100); A tearable sheath (300), the tearable sheath (300) being arranged on the outer surface of the outermost expansion tube (200); A Y-valve (400) is detachably mounted on the inlet end.

2. The puncture synchronous dilator according to claim 1, characterized in that: A first connecting structure (500) is provided between the inner expansion tube (100) and the Y-valve (400), and the inner expansion tube (100) and the Y-valve (400) are detachably connected via the first connecting structure (500). The first connecting structure (500) includes a first thread (510) provided at the end of the inner expansion tube (100) close to the direction of the Y-valve (400), and a second thread (520) adapted to the first thread (510) is provided at the end of the Y-valve (400) close to the direction of the inner expansion tube (100).

3. The puncture synchronous dilator according to claim 1, characterized in that: The inner expansion tube (100) comprises a first tube body (110) and a second tube body (120), and the first tube body (110) and the second tube body (120) are detachably connected.

4. The puncture synchronous dilator according to claim 3, characterized in that: A second connecting structure (600) is provided between the first tube body (110) and the second tube body (120), and the first tube body (110) and the second tube body (120) are detachably connected via the second connecting structure (600). The second connecting structure (600) includes a third thread (610) provided at the end of the first tube body (110) close to the second tube body (120), and a fourth thread (620) adapted to the third thread (610) is provided at the end of the second tube body (120) close to the first tube body (110).

5. The puncture synchronous dilator according to claim 4, characterized in that: The third thread (610) is an external thread, and the fourth thread (620) is an internal thread; Alternatively, the third thread (610) is an internal thread, and the fourth thread (620) is an external thread.

6. The puncture synchronous dilator according to claim 1, characterized in that: The tearable sheath (300) comprises a tear tube (310), a hand-held portion (330) is provided at the end of the tear tube (310), and a tear groove (320) is axially opened on the outer surface of the tear tube (310).

7. The puncture synchronous dilator according to claim 6, characterized in that: The tear tube (310) is provided with a scale.

8. The puncture synchronous dilator according to claim 1, characterized in that: The Y-valve (400) includes a main pipe (410) detachably connected to the inner expansion tube (100), a secondary pipe (420) is obliquely arranged on the outer surface of the main pipe (410), a first connecting cavity (430) is opened in the axial direction inside the main pipe (410), and a second connecting cavity (440) is opened in the axial direction inside the secondary pipe (420), and the first connecting cavity (430) is communicated with the second connecting cavity (440).

9. The puncture synchronous dilator according to claim 1, characterized in that: The inner expansion tube (100) is cylindrical and hollow, and the outlet end is tapered.

10. The puncture synchronous dilator according to claim 1, characterized in that: Gaps are defined between the outer expansion tube (200) and the inner expansion tube (100), between adjacent outer expansion tubes (200), and between the outermost outer expansion tube (200) and the tearable sheath (300).

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