Negative pressure regulation and control structure and ureteral access sheath

Abstract

The present application belongs to the technical field of medical instruments. Provided are a negative pressure regulation and control structure and a ureteral access sheath. The negative pressure regulation and control structure comprises a negative pressure tube and a suction valve. The negative pressure tube is provided with a suction channel and a hole which are communicated with each other, wherein the suction valve is in a sliding fit with the negative pressure tube, and the flow area of the hole can be adjusted by sliding the suction valve. The suction valve comprises a valve main body and a connecting protrusion which are connected to each other, the valve main body being arranged outside the negative pressure tube; the connecting protrusion passes through the hole and partially protrudes out of the inner wall of the negative pressure tube, and is snap-fastened to the inner wall of the negative pressure tube, the face of the connecting protrusion snap-fastened to and abutting against the inner wall of the negative pressure tube is a limiting face; and in the direction from the side of the limiting face close to the hole towards the side away from the hole, the limiting face inclines in a direction away from the valve main body. By means of setting the limiting face to be inclined in the direction away from the valve main body so as to expand a mounting space between the limiting face and the valve main body, the present application reduces the amount of deformation of the valve main body required by the connecting protrusion entering the suction channel, thereby improving the convenience in mounting the suction valve.

Description

A negative pressure regulation structure and ureteral sheath Technical Field

[0001] This application belongs to the field of medical devices, specifically relating to a negative pressure regulation structure and a ureteral sheath. Background Technology

[0002] Ureteral sheaths are used in urological surgery to create a surgical channel that allows endoscopes and other instruments to enter the urinary tract. Blood clots, small stones, and purulent flocculent material are also discharged from the ureteral sheath.

[0003] In related technologies, the ureteral sheath has a negative pressure tube, which is slidably connected to a suction valve. The suction valve is used to regulate the negative pressure within the negative pressure tube. However, the suction valve is easily damaged during assembly, thus affecting its pressure regulation effect. Utility Model Content

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

[0005] This application is implemented as follows:

[0006] In a first aspect, this application provides a negative pressure control 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 is slidably fitted with the negative pressure tube, and the flow area of ​​the opening can be adjusted by moving the suction valve relative to the negative pressure tube; 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 engaged with the inner wall of the negative pressure tube, the surface of the connecting protrusion engaged with the inner wall of the negative pressure tube is a limiting surface, and the limiting surface is inclined away from the valve body 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.

[0007] Secondly, this application provides a ureteral sheath, including 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 extending along its axial direction, the sheath seat has a second working channel extending along its axial direction, the sheath body is connected to the distal end of the sheath seat, and the first working channel and the second working channel are connected 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 in this application can achieve the following beneficial effects:

[0009] In this application, by setting a connecting protrusion, a portion of the connecting protrusion is engaged with the inner wall of the negative pressure pipe to limit the position of the suction valve and prevent the suction valve from detaching from the opening; and the limiting surface is set to be inclined away from the valve body along the side of the limiting surface close to the opening and towards the side of the limiting surface away from the opening, so as to expand the installation space between the limiting surface and the valve body. During the process of assembling the suction valve into the negative pressure pipe, the expanded installation space allows the connecting protrusion to enter a deeper position in the opening, reducing the deformation of the valve body required for the connecting protrusion to enter the suction channel, thereby improving the ease of assembly of the suction valve. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

[0015] Figure 5 is a side view of a negative pressure regulation structure provided in some embodiments of this application;

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

[0017] Figure 7 is a schematic diagram of the overall structure of the ureteral sheath provided in some embodiments of this application;

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

[0019] Figure 9 is a schematic diagram of the structure of the inner sheath assembly provided in some embodiments of this application;

[0020] Figure 10 is a schematic diagram of the overall structure of the ureteral sheath provided in some embodiments of this application.

[0021] In the diagram: 100-Negative pressure pipe, 110-Suction channel, 120-Opening, 130-Input end, 200-Suction valve, 210-Connecting protrusion, 211-Limiting surface, 212-Avoidance cut, 213-Connecting support, 214-Abutting 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 Implementation

[0022] The following description provides many different embodiments or examples for implementing various features of this application. The elements and arrangements described in the specific examples below are only for concise expression of this application and are merely examples, not intended to limit this application.

[0023] In this application, "proximal end" and "distal end" refer to the near and far positions of the structure relative to human operation in the usage environment, in order to facilitate the description of the positional relationship between the components and to facilitate understanding; "proximal end" and "distal end" are relative positional relationships, not absolute ones.

[0024] In related technologies, the negative pressure pipe has an opening, and the suction valve slides within the negative pressure pipe to adjust the size of the exposed opening. The suction valve has a snap-fit ​​structure that engages with the negative pressure pipe to prevent it from detaching from the opening. During the assembly of the suction valve, the snap-fit ​​structure needs to be inserted into the negative pressure pipe through the opening. Because the opening is small and the snap-fit ​​structure is large, the suction valve needs to undergo significant deformation to secure the structure into the pipe. This significant deformation can damage the suction valve's structure, potentially leading to cracks or even complete breakage, thus affecting its pressure regulation performance.

[0025] In view of this, the present application discloses a negative pressure control structure, which, as shown in Figures 1 to 6, includes a negative pressure pipe 100 and a suction valve 200.

[0026] The negative pressure tube 100 is equipped with a suction channel 110. During use, the suction channel 110 connects to the surgical channel of the ureteral sheath to apply negative pressure to the lesion site. To facilitate control of the negative pressure within the suction channel 110, the tube wall of the negative pressure tube 100 is provided with an opening 120, which connects to the suction channel 110. By controlling the flow area of ​​the opening 120, the size of the opening for gas exchange between the suction channel 110 and the external environment is controlled, thereby regulating the air pressure within the suction channel 110.

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

[0028] There are several ways to achieve a sliding fit between the suction valve 200 and the negative pressure pipe 100. For example, the suction valve 200 is sleeved outside the negative pressure pipe 100, and the opening 120 can be blocked by sliding the suction valve 200 along the axial direction of the negative pressure pipe 100. Alternatively, either the suction valve 200 or the negative pressure pipe 100 may have a groove, while the other may have a slider, achieving a sliding fit through the cooperation of the groove and the slider. Furthermore, a limiting structure can be provided between the groove and the slider to prevent the slider from disengaging from the groove along its depth direction.

[0029] This application discloses a sliding engagement method between a suction valve 200 and a negative pressure pipe 100, as shown in Figures 1 and 2. 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 an opening 120 and partially protrudes from the inner wall of the negative pressure pipe 100, engaging with the inner wall of the negative pressure pipe 100. The sliding engagement between the suction valve 200 and the negative pressure pipe 100 is achieved by sliding the connecting protrusion 210 along the opening 120. It can be understood that using the opening 120 as a sliding track avoids the need for additional tracks in the negative pressure pipe 100, reducing the processing steps of the negative pressure pipe 100; simultaneously, it also avoids the situation where the negative pressure pipe 100 or the suction valve 200 is slotted, leading to a reduction in its structural strength.

[0030] The connecting protrusion 210 passes through the opening 120 and partially engages with the inner wall of the negative pressure pipe 100. This engagement structure positions the connecting protrusion 210 and the valve body 220 on the inner and outer sides of the negative pressure pipe 100, respectively. This connecting protrusion 210 acts as a limiting element, preventing it from directly passing through the opening 120 and detaching from the suction channel 110. In a specific implementation, the dimensions of the connecting protrusion 210 and the opening 120 can be restricted, allowing the connecting protrusion 210 to be wider and the connecting protrusion 210 to be narrower. The narrower connecting protrusion 210 is located within the opening 120, while the wider connecting protrusion 210 is located within the suction channel 110 and engages with the inner wall of the negative pressure pipe 100.

[0031] Since the size of the connecting protrusion 210 is larger than the size of the opening 120, the deformation of the valve body 220 is required during assembly to fit the connecting protrusion 210 into the suction channel 110.

[0032] The surface on which the connecting protrusion 210 and the negative pressure pipe 100 interlock and abut is called the limiting surface 211. The limiting surface 211 has two opposite ends, one end close to the opening 120 and the other end 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 away from the valve body 220, thereby increasing the space between the limiting surface 211 and the valve body 220. 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 connected protrusion 210 and the opening 120 after assembly. For ease 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 with the limiting surface 211 is first inserted at an angle into the opening 120, making the connecting protrusion 210 as close as possible to the suction channel 110. After the valve body 220 abuts against the outer surface of the negative pressure pipe 100 and part of the connecting protrusion 210 abuts against the wall of the opening 120, the connecting protrusion 210 can no longer move towards the suction channel 110, as shown in Figure 6. At this point, it is necessary to press the valve body 220 firmly to deform the valve body 220, thereby pressing the connecting protrusion 210 into the suction channel 110.

[0034] During the process of deforming the valve body 220 by pressing it, the first end of the limiting surface 211 remains in contact with the wall of the opening 120 until the first end of the limiting surface 211 enters the suction channel 110. Because the limiting surface 211 is inclined away from the valve body 220, compared to the non-inclined structure in the prior art, the space between the first end of the limiting surface 211 and the valve body 220 is expanded. Before the valve body 220 deforms, the connecting protrusion 210 can be closer to the suction channel 110, reducing the distance the connecting protrusion 210 needs to move and thus reducing the deformation of the valve body 220 required to move the connecting protrusion 210. Correspondingly, the force applied to the valve body 220 is also reduced, thereby improving the ease 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 pipe 100.

[0035] In Figure 6, the dashed line above the limiting surface 211 indicates that the limiting surface 211 is not inclined away from the valve body 220. The space between the limiting surface 211 and the valve body 220 is small, and the distance between the first end of the limiting surface 211 and the suction channel 110 will be slightly farther. The deformation of the valve body 220 required later will be greater. 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 structural damage to the valve body 220.

[0036] Furthermore, the inclined limiting surface 211 has lower precision requirements. In the fit structure between the limiting surface 211 and the inner wall of the suction channel 110, generally the first end of the limiting surface 211 is in contact with the inner wall of the suction channel. As long as the position of the first end of the limiting surface 211 is accurate, the suction valve 200 can be installed in place, the valve body 220 can fit tightly with the outer surface of the negative pressure pipe 100, and the sealing effect of the opening 120 is better. Therefore, the overall precision requirements for the limiting surface 211 are low.

[0037] Along the width direction of the opening 120, the connecting protrusion 210 has two opposing sides, one of which has 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 pipe 100, as shown in Figure 6.

[0038] In some preferred embodiments of this application, the connecting protrusion 210 has an avoidance cut 212 that extends through the connecting protrusion 210 along the sliding direction of the suction valve 200, thereby forming two connecting legs 213. The two connecting legs 213 are located on both sides of the sliding direction of the suction valve 200, and both connecting legs 213 slide in engagement with the negative pressure tube 100, as shown in Figures 4 and 5. The avoidance cut 212 provides deformation space for the connecting legs 213. The connecting legs 213 that abut against the outer wall of the negative pressure tube 100 can compress the space of the avoidance cut 212 and move closer to the other connecting leg 213, thereby reducing the overall size of the connecting protrusion 210 and making it easier for the connecting protrusion 210 to enter the suction channel 110.

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

[0040] Referring to Figure 6, the contact position between the limiting surface 211 and the 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 pipe 100, the suction valve 200 can no longer rotate to adjust its position. Shortening the height of the connecting leg 213 allows the limiting surface 211 to enter the opening 120 deeper and closer to the suction channel 110, making assembly easier. During the subsequent deformation of the connecting leg 213 into the opening 120, the shorter the height of the connecting leg 213, the less deformation is required for the connecting leg 213 to enter the suction channel 110, making it easier for the connecting leg 213 to enter the suction channel 110.

[0041] In Figure 6, the dashed line near the contact surface 214 indicates the contact surface 214 that is not inclined towards the valve body 220. The connecting leg 213 is relatively high, and the contact time with the outer surface of the negative pressure pipe 100 is earlier. This results in a shorter distance for the limiting surface 211 to enter the opening 120, and a longer distance between the limiting surface 211 and the suction channel 110, requiring a higher deformation of the valve body 220. At the same time, the higher the connecting leg 213 is, the more difficult it is for the connecting leg 213 to deform as it enters the suction channel 110.

[0042] The connecting protrusion 210 has at least one limiting surface 211 and one abutting surface 214, and each connecting leg 213 has at least one of the limiting surface 211 and the abutting surface 214. That is, 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 located on different connecting legs 213.

[0043] In some specific embodiments of this 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. Furthermore, with this arrangement, during the assembly of the suction valve 200, care must be taken with the connecting leg 213 on the side where the limiting surface 211 is located, ensuring that the connecting leg 213 with the limiting surface 211 enters the opening 120 first. In other specific embodiments of this 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, resulting in a better limiting effect on the suction valve 200. In still other embodiments, both connecting legs 213 have limiting surfaces 211 and abutment surfaces 214, allowing for convenient assembly of the suction valve 200 regardless of which leg enters the opening 120 first.

[0044] The outer surface of the negative pressure pipe 100 has an annular protrusion 300 surrounding the opening 120. The annular protrusion 300 supports the valve body 220 and slides with it, as shown in Figure 3. The annular protrusion 300 is located between the negative pressure pipe 100 and the valve body 220, replacing the surface of the negative pressure pipe 100 in sliding contact with the valve body 220. Compared to the valve body 220 directly contacting the outer surface of the negative pressure pipe 100, the annular protrusion 300 reduces the contact area between the valve body 220 and the negative pressure pipe 100, reduces friction between them, and improves the smoothness of sliding of the valve body 220.

[0045] To achieve a better fit between the annular protrusion 300 and the valve body 220, the machining precision requirements for the annular protrusion 300 are higher. The machining requirements for the annular protrusion 300 are also higher during the machining of the negative pressure pipe 100. Compared to the valve body 220 directly contacting the outer surface of the negative pressure pipe 100, setting the annular protrusion 300 can reduce the area requiring high-precision machining, thereby relatively improving machining quality and reducing machining difficulty.

[0046] The outer contour dimension of the annular protrusion 300 can be smaller than that of the valve body 220, so that even when the valve body 220 completely covers the opening 120, it can also completely cover the annular protrusion 300, further reducing the contact area between the annular protrusion 300 and the valve body 220. Only a portion of the valve body 220 near the opening 120 contacts the annular protrusion 300, while the portion of the valve body 220 far from the opening 120 is directly suspended on the surface of the negative pressure pipe 100. On both sides of the sliding direction of the valve body 220, a clearance gap 400 is provided between the valve body 220 and the surface of the negative pressure pipe 100. During the assembly of the suction valve 200, the clearance gap 400 provides some space for the valve body 220, thereby reducing the deformation of the valve body 220 and further reducing the risk of structural damage to the valve body 220.

[0047] In some preferred embodiments, the abutment surface 214 and the limiting surface 211 of the same connecting leg 213 are arranged parallel to each other to ensure the thickness and strength of the part of the connecting leg 213 used to limit the cooperation with the negative pressure pipe 100, and also to avoid structural damage to the connecting leg 213 during the assembly process.

[0048] The clearance cut 212 provides deformation space for the two connecting legs 213. The end face of the clearance cut 212 away from the attraction channel 110 is an arc surface, which reduces stress concentration points and thus reduces the risk of stress concentration on the end face of the clearance cut 212.

[0049] In some preferred embodiments, the connecting protrusion 210 is located near one end of the valve body 220 in its sliding direction. Thus, when the connecting protrusion 210 abuts against the end of the opening 120, the valve body 220 moves to its limit position, maximizing or minimizing the obstruction of the opening 120. The operator can judge the position of the valve body 220 by touch, thereby improving the ease of use of 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. During the operation of the negative pressure control structure, the operator can hold the negative pressure tube 100 with their thumb and forefinger. The thumb presses on the valve body 220, and the forefinger presses on the anti-slip structure 500. The thumb controls the sliding of the valve body 220. The forefinger contacts the anti-slip structure 500 to prevent the position of the forefinger from slipping and affecting the operation of the thumb. The protective structure and the valve body 220 are located on the radial sides of the negative pressure tube 100, respectively, to accommodate the position of the operator's fingers. The anti-slip structure 500 is generally composed of multiple protrusions.

[0051] In some preferred embodiments, the anti-slip structure 500 extends toward the input end 130 of the negative pressure tube 100. The input end 130 is the end of the negative pressure tube 100 used to connect to the sheath seat 700 of the ureteral sheath. To more stably hold the negative pressure tube 100, the operator's hand will be placed closer to the sheath seat 700. The extension of the anti-slip structure 500 toward the input end 130 allows the operator's fingers to better cover the anti-slip structure 500 when holding the negative pressure tube 100 control valve body 220, increasing the contact area between the anti-slip structure 500 and the fingers, and improving the friction between them.

[0052] Referring to Figures 7 to 10, this application also discloses a ureteral sheath, which includes a sheath body 600, a sheath seat 700, and the aforementioned negative pressure regulation structure.

[0053] 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 and second working channels 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 integrally injection molded during manufacturing, a template is pre-set at the position of the opening 120. After the negative pressure tube 100 is formed, demolding is performed. In some embodiments of this application, the projection of the edge of the opening 120 and the projection of the tube sheath seat 700 are independently set along the axis of the opening 120, as shown in Figure 8. During the demolding process, the movement path of the template will not intersect with the tube sheath seat 700, which facilitates the operator's application of force and also avoids the template from being damaged by contact with the tube sheath seat 700 during the demolding process.

[0055] The second working channel 710 includes a first sub-channel 711 and a second sub-channel 712 arranged axially therein. 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, as shown in Figure 8. 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. Furthermore, 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 to its transitional function, the transition structure 720 also serves a guiding function, guiding the inner sheath 810 from the second sub-channel 712 into the first working channel.

[0056] The inner sheath 810 is part of the inner sheath assembly 800, which also includes an inner sheath seat 820, as shown in Figure 9. The inner sheath 810 is inserted into the surgical channel of the ureteral sheath via the inner sheath seat 820, which is mounted on the sheath seat 700. The inner sheath seat 820 and the sheath seat 700 are connected by a rotational snap-fit ​​mechanism. As shown in Figure 10, the inner sheath seat 820 has a protrusion, and the sheath seat 700 has a groove. During the insertion of the inner sheath 810 into the surgical channel, the inner sheath seat 820 is gradually inserted into the sheath seat 700, with the protrusion snapping into the groove until the inner sheath seat 820 can no longer be inserted into the sheath seat 700. Then, the inner sheath seat 820 is rotated, causing the protrusion to rotate. The groove is similar to an L-shape, and the protrusion rotates to engage with the groove wall, thus fixing the inner sheath seat 820 in place.

[0057] In some embodiments of this 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 within 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 seal 900, which can seal the proximal opening of the sheath seat 700, as shown in FIG7.

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

Claims

1. A negative pressure regulation structure, characterized in that, Includes a negative pressure pipe (100) and a suction valve (200); wherein: The negative pressure tube (100) has a suction channel (110) and an opening (120) communicating with the suction channel (110). The suction valve (200) is slidably engaged with the negative pressure tube (100), and the flow area of ​​the opening (120) can be adjusted by moving the suction valve (200) relative to the negative pressure tube (100). The suction valve (200) includes 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 pipe (100). The connecting protrusion (210) passes through the opening (120) and partially protrudes from the inner wall of the negative pressure pipe (100) and is engaged with the inner wall of the negative pressure pipe (100). The surface of the connecting protrusion (210) that engages with the inner wall of the negative pressure pipe (100) is a limiting surface (211). Along the side of the limiting surface (211) close to the opening (120) towards the side of the limiting surface (211) away from the opening (120), the limiting surface (211) is inclined away from the valve body (220).

2. The negative pressure regulation structure according to claim 1, characterized in that, The connecting protrusion (210) has a clearance cut (212) that extends through 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 an abutment surface (214), which is the end face of the connecting leg (213) near the suction channel (110), and is inclined away from the valve body (220) along the side of the abutment surface (214) near the clearance cut (212) towards the side of the abutment surface (214) away from the clearance cut (212). At least one of the connecting legs (213) has the limiting surface (211), and each of the connecting legs (213) has at least one of the limiting surface (211) and the abutment surface (214).

3. The negative pressure regulation structure according to claim 2, characterized in that, The abutting surface (214) of the same connecting leg (213) is arranged parallel to the limiting surface (211); And / or, the end face of the avoidance cut (212) away from the attraction channel (110) is an arc surface.

4. The negative pressure regulation 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 slides with the valve body (220).

5. The negative pressure regulation 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) near the opening (120) contacts and engages with the annular protrusion (300), and the surface of the valve body (220) away from the opening (120) forms an avoidance gap (400) with the negative pressure pipe (100).

6. The negative pressure regulation structure according to claim 1, characterized in that, The connecting protrusion (210) is located at one end of the valve body (220) in its sliding direction; 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 the radial sides of the negative pressure tube (100), and the anti-slip structure (500) extends toward the input end (130) of the negative pressure tube (100), the input end (130) is used to connect the sheath seat (700) of the ureteral sheath.

7. A ureteral sheath, characterized in that, It includes a sheath body (600), a sheath seat (700), and the negative pressure regulating structure according to any one of claims 1-6; 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 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.

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 set 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.

Images