Negative pressure regulation and control structure and ureter sheath

Abstract

The utility model provides a negative pressure regulation and control structure and a ureter sheath, and belongs to the technical field of medical instruments. The negative pressure regulation and control structure comprises a negative pressure pipe and a suction valve; the negative pressure pipe is provided with a suction channel and an opening which are communicated with each other, the suction valve is in sliding fit with the negative pressure pipe, and the circulation area of the opening can be adjusted by sliding the suction valve; the suction valve comprises a valve body and a connecting protrusion which are connected with each other, the valve body is located outside the negative pressure pipe, the connecting protrusion penetrates through the open hole, partially protrudes out of the inner wall of the negative pressure pipe and is connected with the inner wall of the negative pressure pipe in a buckled mode, and the face, connected with the inner wall of the negative pressure pipe in a buckled and abutting mode, of the connecting protrusion is a limiting face. The limiting face inclines in the direction away from the valve body from the side, close to the open hole, of the limiting face to the side, away from the open hole, of the limiting face. According to the suction valve, the limiting face is obliquely arranged in the direction away from the valve body, so that the installation space between the limiting face and the valve body is enlarged, the deformation amount of the valve body needed by the connecting protrusion entering the suction channel is reduced, and the convenience of assembly of the suction valve is improved.

Description

Technical Field

[0001] The utility model belongs to the field of medical devices, and specifically relates to a negative pressure regulating structure and a ureteral sheath. Background Art

[0002] Ureteral sheaths are used in urological surgeries to create a surgical channel that facilitates the entry of endoscopes and other instruments into the urinary tract. Some blood clots, small stones, and purulent flocs are also discharged from the ureteral sheath.

[0003] In the related art, the ureteral sheath has a negative pressure tube, which is slidably connected to a suction valve, and the suction valve is used to adjust the negative pressure in the negative pressure tube. However, the suction valve is easily damaged during the assembly process, thereby affecting its pressure regulation effect. Utility Model Content

[0004] The purpose of this application is to provide a negative pressure control structure and a ureteral sheath to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In the first aspect, the present application provides a negative pressure regulation structure, including a negative pressure tube and a suction valve; wherein: the negative pressure tube has a suction channel and an opening connected to the suction channel, the suction valve and the negative pressure tube are slidably matched, and the suction valve can be moved relative to the negative pressure tube to adjust the flow area of ​​the opening; the suction valve includes a valve body and a connecting protrusion connected to the valve body, the valve body is located outside the negative pressure tube, the connecting protrusion passes through the opening and partially protrudes from the inner wall of the negative pressure tube and is buckled with the inner wall of the negative pressure tube, the surface where the connecting protrusion is buckled and stopped with the inner wall of the negative pressure tube is a limiting surface, and the limiting surface is inclined in the direction from the side of the limiting surface close to the opening to the side of the limiting surface away from the opening, and the limiting surface is inclined in the direction away from the valve body.

[0007] In the second aspect, the present application provides a ureteral sheath, comprising a sheath body, a sheath seat and the negative pressure control structure provided in the first aspect; wherein: the sheath body has a first working channel running through it along its axial direction, the sheath seat has a second working channel running through it along its axial direction, the sheath body is connected to the distal end of the sheath seat, and the first working channel is connected to the second working channel to form a surgical channel, the negative pressure tube is connected to the sheath seat, and the suction channel is connected to the surgical channel.

[0008] The technical solution provided by this application can achieve the following beneficial effects:

[0009] In the present application, by setting a connecting protrusion, part of the connecting protrusion is engaged with the inner wall of the negative pressure tube to limit the position of the suction valve and prevent the suction valve from detaching from the opening; and the limiting surface is inclined in the direction away from the valve body along the side of the limiting surface close to the opening toward the side of the limiting surface far away from the opening to expand the size of the installation space between the limiting surface and the valve body. In the process of assembling the suction valve to the negative pressure tube, the expanded installation space can make the connecting protrusion enter a deeper position of the opening, reduce the deformation amount of the valve body required for the connecting protrusion to enter the suction channel, thereby improving the convenience of assembling the suction valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a schematic diagram of the overall structure of the negative pressure regulating structure provided in some embodiments of the present application;

[0012] Figure 2 is a partial cross-sectional view of a negative pressure regulating structure provided in some embodiments of the present application;

[0013] Figure 3 is a schematic diagram of the structure of a negative pressure tube provided in some embodiments of the present application;

[0014] Figure 4 is a schematic diagram of the structure of a negative pressure valve provided in some embodiments of the present application;

[0015] Figure 5 is a side view of a negative pressure regulating structure provided in some embodiments of the present application;

[0016] Figure 6 is a schematic diagram of the assembly process of the negative pressure regulating structure provided in some embodiments of the present application;

[0017] Figure 7 The overall structure of the ureteral sheath provided in some embodiments of the present application is shown in FIG. Figure 1 ;

[0018] Figure 8 is a cross-sectional view of a tube sheath seat and a negative pressure tube provided in some embodiments of the present application;

[0019] Fig. 9 It is a schematic diagram of the structure of the inner sheath assembly provided by some embodiments of the present application;

[0020] Fig.10The overall structure of the ureteral sheath provided in some embodiments of the present application is shown in FIG. Figure 2 .

[0021] In the figure: 100-negative pressure tube, 110-suction channel, 120-opening, 130-input end, 200-suction valve, 210-connecting protrusion, 211-limiting surface, 212-avoidance incision, 213-connecting foot, 214-abutment surface, 220-valve body, 300-annular protrusion, 400-avoidance gap, 500-anti-slip structure, 600-sheath body, 700-sheath seat, 710-second working channel, 711-first sub-channel, 712-second sub-channel, 720-transition structure, 800-inner sheath assembly, 810-inner sheath, 820-inner sheath seat, 900-seal. DETAILED DESCRIPTION

[0022] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0023] In the present utility model, "proximal end" and "distal end" refer to the distance between the structure and the human body in the use environment, so as to facilitate the description of the positional relationship between the components and facilitate understanding; "proximal end" and "distal end" are relative positional relationships, not absolute ones.

[0024] In the related art, the negative pressure tube is provided with an opening, the suction valve and the negative pressure tube are slidably matched, the size of the opening exposed is adjusted, and the suction valve is provided with a snap-fit ​​structure to snap into the negative pressure tube, thereby preventing the suction valve from being separated from the opening. In the process of assembling the suction valve, the snap-fit ​​structure needs to be inserted into the negative pressure tube through the opening. Since the opening is small and the snap-fit ​​structure is large, the suction valve needs to be deformed greatly to snap the snap-fit ​​structure into the negative pressure tube. Due to the large deformation of the suction valve, the structure of the suction valve is easily damaged, resulting in cracks in the suction valve, or part of the structure of the suction valve is directly broken, affecting the pressure regulation effect of the suction valve.

[0025] In view of this, the present application embodiment discloses a negative pressure control structure, which can be combined with Figures 1 to 6 As shown, the negative pressure regulating structure includes a negative pressure tube 100 and a suction valve 200 .

[0026] A suction channel 110 is provided in the negative pressure tube 100. In use, the suction channel 110 is connected to the surgical channel of the ureteral sheath to perform negative pressure adsorption on the lesion. In order to conveniently control the negative pressure in the suction channel 110, the tube wall of the negative pressure tube 100 is provided with an opening 120, and the opening 120 is connected to the suction channel 110. By controlling the flow area of ​​the opening 120, the opening size of the suction channel 110 for gas exchange with the external environment is controlled, thereby adjusting the air pressure in the suction channel 110.

[0027] The suction valve 200 is slidably disposed on the negative pressure tube 100. By sliding the suction valve 200, the relative position of the suction valve 200 and the opening 120 is changed, so that the flow area of ​​the suction valve 200 changes, the opening size of the gas between the suction channel 110 and the external environment is changed, and the air pressure in the suction channel 110 is adjusted.

[0028] There are many ways of sliding cooperation between the suction valve 200 and the negative pressure tube 100. For example, the suction valve 200 is sleeved outside the negative pressure tube 100, and the opening 120 can be blocked by sliding the suction valve 200 along the axial direction of the negative pressure tube 100. Alternatively, one of the suction valve 200 and the negative pressure tube 100 is provided with a slide groove, and the other is provided with a slider, and the sliding cooperation between the two is achieved by the cooperation of the slide groove and the slider. In addition, a limiting structure can also be provided between the slide groove and the slider to prevent the slider from being separated from the slide groove along the depth direction of the slide groove.

[0029] The present application embodiment discloses a sliding cooperation method between the suction valve 200 and the negative pressure tube 100, which can be referred to Figure 1 and Figure 2 As shown. The suction valve 200 has a valve body 220 and a connecting protrusion 210 connected to the valve body 220. The connecting protrusion 210 passes through the opening 120 and partially protrudes from the inner wall of the negative pressure tube 100 and is buckled with the inner wall of the negative pressure tube 100. The connecting protrusion 210 passes through the opening 120, and the connecting protrusion 210 is used to slide along the opening 120 to achieve the sliding fit between the suction valve 200 and the negative pressure tube 100. It can be understood that by using the opening 120 as a sliding track, it is possible to avoid setting an additional track on the negative pressure tube 100, which can reduce the processing procedures of the negative pressure tube 100; at the same time, it is also possible to avoid the situation where the negative pressure tube 100 is grooved or the suction valve 200 is grooved, resulting in a decrease in its structural strength.

[0030] The connecting protrusion 210 passes through the opening 120 and part of the connecting protrusion 210 is buckled with the inner wall of the negative pressure tube 100. The buckling structure makes part of the connecting protrusion 210 and the valve body 220 located at the inner and outer sides of the negative pressure tube 100 respectively. The part of the connecting protrusion 210 plays a limiting role to prevent the connecting protrusion 210 from directly passing through the opening 120 and escaping from the suction channel 110. In a specific implementation, the size of the connecting protrusion 210 and the opening 120 can be limited so that part of the connecting protrusion 210 is wider and part of the connecting protrusion 210 is narrower. The part of the connecting protrusion 210 with a narrower size is located in the internal space of the opening 120, and the part of the connecting protrusion 210 with a wider size is located in the suction channel 110 and buckled with the inner wall of the negative pressure tube 100.

[0031] Since the size of a portion of the connecting protrusion 210 is larger than the size of the opening 120 , during the assembly process, it is necessary to utilize the deformation of the valve body 220 to assemble the connecting protrusion 210 into the suction channel 110 .

[0032] The surface where the connecting protrusion 210 and the tube wall of the negative pressure tube 100 are buckled and abutted is a limiting surface 211. The limiting surface 211 has two oppositely arranged ends, one end is close to the opening 120, and the other end is far away from the opening 120. Along the direction from the side of the limiting surface 211 close to the opening 120 to the side of the limiting surface 211 far away from the opening 120, the limiting surface 211 is inclined in the direction away from the valve body 220, so that the space between the limiting surface 211 and the valve body 220 becomes larger. It can be understood that the end of the limiting surface 211 far away from the opening 120 is defined by the relative position of the connecting protrusion 210 and the opening 120 after assembly. For the convenience of subsequent understanding and description, the end of the limiting surface 211 far away from the opening 120 is defined as the first end of the limiting surface 211.

[0033] During the assembly of the connecting protrusion 210, the portion of the connecting protrusion 210 having the limiting surface 211 is first inserted obliquely into the opening 120, so that the connecting protrusion 210 is as close to the suction channel 110 as possible. After the valve body 220 abuts against the outer surface of the negative pressure tube 100 and a portion of the connecting protrusion 210 abuts against the hole wall of the opening 120, the connecting protrusion 210 can no longer move toward the suction channel 110. Figure 6 At this time, the valve body 220 needs to be pressed hard to deform the valve body 220 so that the connecting protrusion 210 can be pressed into the suction channel 110 .

[0034] In the process of pressing the valve body 220 to deform the valve body 220, the first end of the limiting surface 211 is always in contact with the hole wall of the opening 120 until the first end of the limiting surface 211 enters the suction channel 110. Since the limiting surface 211 is tilted away from the valve body 220, compared with the non-tilted structure in the prior art, the space between the first end of the limiting surface 211 and the valve body 220 is enlarged. Before the valve body 220 is deformed, the connecting protrusion 210 can be closer to the suction channel 110, and the distance that the connecting protrusion 210 needs to move is also reduced, and the deformation amount of the valve body 220 required to move the connecting protrusion 210 is also relatively reduced. Correspondingly, the force applied to the valve body 220 will also be reduced accordingly, thereby improving the convenience of assembly of the connecting protrusion 210. The process of disassembling the suction valve 200 is similar. In addition, the inclined limiting surface 211 can fit more stably with the inner wall of the suction channel 110 , thereby improving the connection stability between the suction valve 200 and the negative pressure tube 100 .

[0035] Figure 6 In the figure, the dotted line above the limit surface 211 indicates that the limit surface 211 is not inclined in the direction away from the valve body 220. The space between the limit surface 211 and the valve body 220 is small, and the distance between the first end of the limit surface 211 and the suction channel 110 will be slightly farther. The deformation of the valve body 220 required later will be larger. The greater the deformation of the valve body 220, the greater the force required for the valve body 220, and the higher the possibility of damage to the structure of the valve body 220.

[0036] In addition, the inclined limiting surface 211 has a lower precision requirement. In the matching structure between the limiting surface 211 and the inner wall of the suction channel 110, the first end of the limiting surface 211 is generally in contact with the inner wall of the suction channel. It is only necessary to pay attention to the accurate position of the first end of the limiting surface 211 so that the suction valve 200 can be installed in place, the valve body 220 and the outer surface of the negative pressure tube 100 are closely attached, the sealing effect of the opening 120 is better, and the overall precision requirement of the limiting surface 211 is low.

[0037] Along the width direction of the opening 120, the connecting protrusion 210 has two oppositely arranged sides, one of which is provided with a limiting surface 211. The length direction of the opening 120 is the sliding direction of the suction valve 200, and the width direction of the opening 120 is perpendicular to its length direction. Due to the size limitation of the connecting protrusion 210, during the assembly process of the connecting protrusion 210, the side of the connecting protrusion 210 opposite to the limiting surface 211 will also abut against the outer wall of the negative pressure tube 100, which can be referred to Figure 6 shown.

[0038] In some preferred embodiments of the present application, the connecting protrusion 210 has an avoidance cutout 212, and the avoidance cutout 212 penetrates the connecting protrusion 210 along the sliding direction of the suction valve 200, thereby forming two connecting legs 213, and the two connecting legs 213 are respectively located on both sides of the sliding direction of the suction valve 200, and the two connecting legs 213 are slidably matched with the negative pressure tube 100, refer to Figure 4 and Figure 5 The avoidance cutout 212 reserves a deformation space for the connecting leg 213. The connecting leg 213 abutting against the outer wall of the negative pressure tube 100 can compress the space of the avoidance cutout 212 and move closer to another connecting leg 213, thereby reducing the overall size of the connecting protrusion 210, making it easier for the connecting protrusion 210 to enter the suction channel 110.

[0039] The end face of the connecting leg 213 close to the suction channel 110 is abutment surface 214. Along the direction from the side of the abutment surface 214 close to the avoidance cutout 212 to the side of the abutment surface 214 away from the avoidance cutout 212, the abutment surface 214 is inclined in a direction away from the valve body 220, so that the closer the connecting leg 213 is to the avoidance cutout 212, the shorter the height is, thereby making it easier for the connecting leg 213 to enter the suction channel 110.

[0040] For reference Figure 6 As shown, the contact position between the limit surface 211 and the hole wall of the opening 120 is also related to the structure of the connecting leg 213. After the connecting leg 213 contacts the outer surface of the negative pressure tube 100, the suction valve 200 can no longer rotate to adjust the position. Shortening the height of the connecting leg 213 can make the limit surface 211 enter the opening 120 deeper, closer to the suction channel 110, and easier to assemble. In the subsequent process of the connecting leg 213 deforming and entering the opening 120, the shorter the height of the connecting leg 213, the less deformation required for the connecting leg 213 to enter the suction channel 110, and the easier it is for the connecting leg 213 to enter the suction channel 110.

[0041] Figure 6 In the figure, the dotted line arranged near the abutting surface 214 indicates that the abutting surface 214 is not inclined in the direction of the valve body 220. The height of the connecting leg 213 is high, and the time of abutting with the outer surface of the negative pressure tube 100 is advanced, resulting in a shorter distance for the limiting surface 211 to enter the opening 120, a longer distance between the limiting surface 211 and the suction channel 110, and a higher deformation amount of the valve body 220. At the same time, the higher the height of the connecting leg 213, the more difficult it is for the connecting leg 213 to deform when entering the suction channel 110.

[0042] The connecting protrusion 210 has at least one limiting surface 211 and one abutting surface 214, and any connecting leg 213 has at least one of the limiting surface 211 and the abutting surface 214. In other words, when the connecting protrusion 210 has only one limiting surface 211 and one abutting surface 214, the limiting surface 211 and the abutting surface 214 are respectively located on different connecting legs 213.

[0043] In some specific embodiments of the present application, the connecting protrusion 210 has only one limiting surface 211, and the connecting protrusion 210 can only limit the suction valve 200 on one side of the opening. In addition, under such a layout, in the process of assembling the suction valve 200, it is necessary to pay attention to the connecting leg 213 on the side where the limiting surface 211 is located, so that the connecting leg 213 where the limiting surface 211 is located first enters the opening 120. In other specific embodiments of the present application, both legs of the connecting protrusion 210 have limiting surfaces 211, and the connecting protrusion 210 can limit the suction valve 200 on both sides of the width of the opening 120, which has a better limiting effect on the suction valve 200. In some other embodiments, both connecting legs 213 have limiting surfaces 211 and abutting surfaces 214, and no matter which leg enters the opening 120 first, the suction valve 200 can be easily assembled.

[0044] The outer surface of the negative pressure tube 100 has an annular protrusion 300 arranged around the opening 120, and the annular protrusion 300 is used to support the valve body 220 and slide with the valve body 220. Figure 3 The annular protrusion 300 is located between the negative pressure tube 100 and the valve body 220, replacing the surface of the negative pressure tube 100 to slide with the valve body 220. Compared with the valve body 220 directly contacting the outer surface of the negative pressure tube 100, the annular protrusion 300 can reduce the contact area between the negative pressure tube 100 and the negative pressure tube 100, reduce the friction between the two, and improve the sliding smoothness of the valve body 220.

[0045] In order to achieve a closer contact between the annular protrusion 300 and the valve body 220, the processing accuracy of the annular protrusion 300 is required to be higher. In the processing of the negative pressure tube 100, the processing requirements for the annular protrusion 300 are higher. Compared with the valve body 220 directly contacting the outer surface of the negative pressure tube 100, the provision of the annular protrusion 300 can reduce the area of ​​high-precision processing, relatively improve the processing quality, and reduce the processing difficulty.

[0046] The outer contour size of the annular protrusion 300 can be smaller than the outer contour size of the valve body 220, so that when the valve body 220 completely blocks the opening 120, the valve body 220 can also completely block the annular protrusion 300, further reducing the contact area between the annular protrusion 300 and the valve body 220. Only a part of the structure of the valve body 220 close to the opening 120 contacts the annular protrusion 300, while a part of the valve body 220 far from the opening 120 is directly suspended on the surface of the negative pressure tube 100. On both sides of the sliding direction of the valve body 220, the gap between the valve body 220 and the surface of the negative pressure tube 100 is set as an avoidance gap 400. In the process of assembling the suction valve 200, the avoidance gap 400 can reserve a part of space for the valve body 220, thereby reducing the deformation of the valve body 220 and further reducing the risk of damage to the structure of the valve body 220.

[0047] In some preferred embodiments, the abutment surface 214 located on the same connecting leg 213 is arranged parallel to the limiting surface 211, so as to ensure the thickness and strength of the partial structure of the connecting leg 213 used for limiting cooperation with the negative pressure tube 100, and also to avoid structural damage to the connecting leg 213 during the assembly process.

[0048] The avoidance cutout 212 provides deformation space for the two connecting legs 213 , and the end surface of the avoidance cutout 212 away from the suction channel 110 is an arc surface, which reduces stress concentration points, thereby reducing the risk of stress concentration on the end surface of the avoidance cutout 212 .

[0049] In some preferred embodiments, the connecting protrusion 210 is close to one end of the valve body 220 in the sliding direction thereof. In this way, when the connecting protrusion 210 abuts against the end of the opening 120, the valve body 220 moves to the limit position, and the shielding of the opening 120 reaches the maximum or minimum. The operator can judge the position of the valve body 220 by feel, thereby improving the convenience of using the negative pressure control structure.

[0050] The outer surface of the negative pressure tube 100 is also provided with an anti-slip structure 500. The anti-slip structure 500 is used to increase the friction between the negative pressure tube 100 and the operator. In the process of operating the negative pressure control structure, the operator can clamp the negative pressure tube 100 with the thumb and index finger, with the thumb pressed on the valve body 220 and the index finger pressed on the anti-slip structure 500, and control the valve body 220 to slide by the thumb. The index finger contacts the anti-slip structure 500 to prevent the index finger from sliding and affecting the operation of the thumb. The protective structure and the valve body 220 are respectively located on both sides of the radial direction of the negative pressure tube 100, so as to adapt to the position of the operator's fingers. The anti-slip structure 500 is generally composed of multiple convex points.

[0051] In some preferred embodiments, the anti-skid structure 500 is extended toward the input end 130 of the negative pressure tube 100. The input end 130 is the end of the negative pressure tube 100 for connecting to the sheath seat 700 of the ureteral sheath. In order to hold the negative pressure tube 100 more stably, the operator's hand will be placed closer to the sheath seat 700, and the anti-skid structure 500 extends toward the input end 130, so that when the operator holds the negative pressure tube 100 to control the position of the valve body 220, the operator's fingers can better cover the anti-skid structure 500, increase the contact area between the anti-skid structure 500 and the fingers, and improve the friction between the two.

[0052] refer to Figures 7 to 10 As shown, the embodiment of the present application further discloses a ureteral sheath, and the disclosed ureteral sheath includes a sheath body 600, a sheath seat 700 and the aforementioned negative pressure control structure.

[0053] The sheath body 600 has a first working channel extending along its axial direction, the sheath seat 700 has a second working channel 710 extending along its axial direction, the sheath body 600 is connected to the distal end of the sheath seat 700, and the first working channel and the second working channel 710 are connected to form a surgical channel. The negative pressure tube 100 is connected to the sheath seat 700, and the suction channel 110 is connected to the surgical channel.

[0054] Since the negative pressure tube 100 is formed by integral injection molding during production, the position of the opening 120 will be set in advance with a template, and demolding is performed after the negative pressure tube 100 is formed. In some embodiments of the present application, along the axis of the opening 120, the projection of the edge of the opening 120 and the projection of the tube sheath seat 700 are set independently of each other, refer to Figure 8 During the demoulding process, the moving path of the template will not intersect with the tube sheath seat 700, which is convenient for the operator to exert force and can also avoid the template from being damaged by contact with the tube sheath seat 700 during the demoulding process.

[0055] The second working channel 710 includes a first sub-channel 711 and a second sub-channel 712 arranged along the axial direction thereof. The sheath body 600 is inserted into the first sub-channel 711. A transition structure 720 is also fixed to the inner wall of the second working channel 710. The transition structure 720 is located between the first sub-channel 711 and the second sub-channel 712. One axial end of the transition structure 720 is connected to the inner wall of the first working channel of the sheath body 600, and the other axial end of the transition structure 720 is connected to the inner wall of the second sub-channel 712. Figure 8As shown. The transition structure 720 makes the inner wall of the surgical channel formed by the first working channel and the second working channel 710 smoother. In addition, the inner diameter of the first working channel is smaller than the inner diameter of the second sub-channel 712, so that the inner diameter of the surgical channel gradually increases along the direction from the second sub-channel 712 to the first working channel, making it easier for the inner sheath 810 to be inserted into the first working channel. In addition, in addition to having a transition function, the transition structure 720 also has a guiding function, guiding the inner sheath 810 to enter the first working channel from the second sub-channel 712.

[0056] The inner sheath 810 is a part of the inner sheath assembly 800, which also includes an inner sheath seat 820. Fig. 9 As shown. The inner sheath 810 is inserted into the surgical channel of the ureteral sheath through the inner sheath seat 820 assembled on the sheath seat 700. The inner sheath seat 820 and the sheath seat 700 can be connected by a rotational clamping method. Fig.10 As shown, the inner sheath seat 820 has a protrusion, and the tube sheath seat 700 has a groove. During the process of inserting the inner sheath 810 into the surgical channel, the inner sheath seat 820 is gradually inserted into the tube sheath seat 700, and the protrusion is snapped into the groove until the inner sheath seat 820 can no longer be inserted into the tube sheath seat 700. Then the inner sheath seat 820 is rotated to rotate the protrusion, and the groove is similar to an L shape. The protrusion rotates to match the groove wall of the groove, and the inner sheath seat 820 is fixed.

[0057] In some embodiments of the present application, along the direction from the transition structure 720 to the first sub-channel 711, the inner diameter of the first working channel of the sheath body 600 located in the first sub-channel 711 gradually increases, making it easier for the inner sheath 810 to be inserted into the first working channel. The sheath seat 700 is also connected to a sealing member 900, which can seal the proximal opening of the sheath seat 700, see Figure 7 shown.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A negative pressure regulating structure, characterized in that: It comprises a negative pressure tube (100) and a suction valve (200); wherein: The negative pressure tube (100) has a suction channel (110) and an opening (120) connected to the suction channel (110); the suction valve (200) is slidably matched with the negative pressure tube (100), and the suction valve (200) can be moved relative to the negative pressure tube (100) to adjust the flow area of ​​the opening (120); The suction valve (200) comprises a valve body (220) and a connecting protrusion (210) connected to the valve body (220); the valve body (220) is located outside the negative pressure tube (100); the connecting protrusion (210) passes through the opening (120) and partially protrudes from the inner wall of the negative pressure tube (100) and is buckled with the inner wall of the negative pressure tube (100); the surface where the connecting protrusion (210) and the inner wall of the negative pressure tube (100) are buckled and abutted is a limiting surface (211); along the direction from the side of the limiting surface (211) close to the opening (120) to the side of the limiting surface (211) away from the opening (120), the limiting surface (211) is inclined in a direction away from the valve body (220).

2. A negative pressure regulating structure according to claim 1, characterized in that: The connecting protrusion (210) has an avoidance cutout (212), and the avoidance cutout (212) penetrates the connecting protrusion (210) along the sliding direction of the suction valve (200) to form two connecting legs (213); At least one of the connecting legs (213) has a contact surface (214), the contact surface (214) being an end surface of the connecting leg (213) close to the suction channel (110), and in a direction from a side of the contact surface (214) close to the avoidance cutout (212) to a side of the contact surface (214) away from the avoidance cutout (212), the contact surface (214) is inclined in a direction away from the valve body (220); At least one of the connecting legs (213) has the limiting surface (211), and any of the connecting legs (213) has at least one of the limiting surface (211) and the abutting surface (214).

3. A negative pressure regulating structure according to claim 2, characterized in that: The abutting surface (214) located on the same connecting leg (213) is arranged parallel to the limiting surface (211); And / or, the end surface of the avoidance cutout (212) away from the suction channel (110) is a curved surface.

4. A negative pressure regulating structure according to claim 1, characterized in that: The outer surface of the negative pressure tube (100) has an annular protrusion (300) arranged around the opening (120); the annular protrusion (300) is used to support the valve body (220) and is slidably matched with the valve body (220).

5. A negative pressure regulating structure according to claim 4, characterized in that: On both sides of the sliding direction of the valve body (220), the surface of the valve body (220) close to the opening (120) contacts and cooperates with the annular protrusion (300), and an avoidance gap (400) is formed between the surface of the valve body (220) away from the opening (120) and the negative pressure tube (100).

6. A negative pressure regulating structure according to claim 1, characterized in that: The connecting protrusion (210) is located at one end of the valve body (220) in the sliding direction thereof; And / or, the outer surface of the negative pressure tube (100) is provided with an anti-slip structure (500), the anti-slip structure (500) and the suction valve (200) are respectively located on both sides of the radial direction of the negative pressure tube (100), and the anti-slip structure (500) is extended toward the input end (130) of the negative pressure tube (100), and the input end (130) is used to connect to the sheath seat (700) of the ureteral sheath.

7. A ureteral sheath, characterized in that: It comprises a sheath body (600), a sheath seat (700), and the negative pressure regulating structure according to any one of claims 1 to 6; wherein: The sheath body (600) has a first working channel extending along its axial direction, and the sheath seat (700) has a second working channel (710) extending along its axial direction. The sheath body (600) is connected to the distal end of the sheath seat (700), and the first working channel is connected to the second working channel (710) to form a surgical channel. The negative pressure tube (100) is connected to the sheath seat (700), and the suction channel (110) is connected to the surgical channel.

8. A ureteral sheath according to claim 7, characterized in that: Along the axis of the opening (120), the projection of the edge of the opening (120) and the projection of the sheath seat (700) are arranged independently of each other.

9. A ureteral sheath according to claim 7, characterized in that: The second working channel (710) includes a first sub-channel (711) and a second sub-channel (712) arranged along its axial direction. The sheath body (600) is inserted into the first sub-channel (711). A transition structure (720) is also fixed to the inner wall of the second working channel (710). The transition structure (720) is located between the first sub-channel (711) and the second sub-channel (712). One axial end of the transition structure (720) is connected to the inner wall of the first working channel of the sheath body (600), and the other axial end of the transition structure (720) is connected to the inner wall of the second sub-channel (712). The inner diameter of the first working channel is smaller than the inner diameter of the second sub-channel (712).

10. A ureteral sheath according to claim 9, characterized in that: Along the direction from the transition structure (720) to the first sub-channel (711), the inner diameter of the first working channel of the sheath body (600) located in the first sub-channel (711) gradually increases.

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