Sheath tube seat and ureter sheath

Abstract

The invention discloses a sheath tube seat and a ureter sheath, and belongs to the field of medical instruments, the structure of an existing sheath tube seat is optimized, and a doctor can hold the sheath tube seat with one hand through a handheld part and a handheld part; the working mirror can be stabilized by the thumb and the index finger while the negative pressure control hole is controlled by a single hand, so that the working mirror can enter and exit conveniently, and personnel assistance is not needed.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a sheath seat and a ureteral sheath. Background Technology

[0002] Currently, negative pressure sheaths have a side branch connected to the negative pressure source on the sheath seat, and the opening on the side branch is connected to the outside. The opening can be covered by hand or a sliding cover to adjust the negative pressure. During surgery, the doctor holds the endoscope in one hand and the sheath seat in the other (the thumb should be against the endoscope to stabilize the endoscope's movement in and out of the sheath). When pressure adjustment is needed, an assistant is required to cover the side branch opening or stabilize the movement of the working endoscope in and out, meaning that the operation cannot be completed by a single person. Summary of the Invention

[0003] The present invention provides a sheath seat and a ureteral sheath, which can at least solve one of the problems pointed out in the background art.

[0004] A sheath seat, comprising:

[0005] The first body contains a working passageway; and

[0006] The second body is connected to one side of the first body, and has a second working channel that communicates with the first working channel.

[0007] The second seat is equipped with a handheld device.

[0008] The handheld device has an internal cavity that is connected to the working channel, and a negative pressure control hole that is connected to the internal cavity is opened on the outer surface of the handheld device.

[0009] The handheld component has two ends, wherein the first end is connected to the middle of the second base, and the second end extends upward or downward, thereby forming a structure that can support the fingers.

[0010] The negative pressure control hole is opened on the side of the handpiece facing the first base or away from the first base, and is located in the middle of the first base or near the connection point between the handpiece and the first base.

[0011] The handheld component and the first base have an included angle α, where 30°≤α≤60°, and the handheld component and the second base have an included angle β, where 70°≤β≤110°.

[0012] The negative pressure control hole is projected onto the surface of the handheld component 3 in the shape of a rectangle, ellipse, circle, or waist shape. Alternatively, the negative pressure control hole may include several non-interconnected strip holes that extend along the perimeter of the handheld component.

[0013] The surface of the handpiece near the edge of the negative pressure control hole has an inwardly recessed pressing groove.

[0014] The distal end of the first base is used to connect to the sheath body, and the proximal end is the entrance to the working mirror. A seal is installed on the proximal end of the first base.

[0015] The sealing element includes a rotary valve, a silicone ring, and a gasket disposed between the rotary valve and the silicone ring;

[0016] The first housing has a groove for accommodating a silicone ring, and the outer diameter of the silicone ring is larger than the diameter of the working channel.

[0017] The rotary valve is threadedly connected to the first seat body. Rotating the rotary valve allows a portion of the rotary valve to extend into the first seat body and push the gasket against the silicone ring. The silicone ring deforms under force, thus sealing the working channel one.

[0018] The handheld component is trigger-shaped, crescent-shaped, or fan-shaped.

[0019] The first base is provided with a hand-held part, which is an arc-shaped structure located on the upper or side of the first base. The hand-held part and the first base form a ring structure, allowing fingers to be inserted into the ring structure to grip the sheath base.

[0020] The handheld component is also connected to a limiting part, which is connected to the second base body. The limiting part, the second base body, and the handheld component form a space that allows a finger to be inserted.

[0021] The first seat body is a split structure, which includes a second sub-seat body connected to the second seat body and a first sub-seat body connected to the sealing element;

[0022] The first sub-base body and the second sub-base body are connected in a detachable manner, which can be a threaded connection, a plug-in connection or a snap-fit ​​connection.

[0023] The first and second sub-bases are respectively fixedly installed with a snap-fit ​​component 1 and a snap-fit ​​component 2 extending in the radial direction. When the first sub-base and the second sub-base are connected, the snap-fit ​​component 1 or the snap-fit ​​component 2 can be moved circumferentially by rotating the first sub-base or the second sub-base, until the snap-fit ​​component 1 moves to the side of the second sub-base opposite to the first sub-base or the snap-fit ​​component 2 moves to the side of the first sub-base opposite to the second sub-base.

[0024] It also includes an annular protrusion and an annular groove that mates with the annular protrusion, with the annular protrusion and the annular groove respectively disposed on the two contact surfaces of the first and second sub-base bodies.

[0025] The silicone ring has at least one mating groove for mating with a rotary valve or gasket, the depth of which is 1 / 10 to 9 / 10 of the thickness of the silicone ring.

[0026] The docking groove is flared.

[0027] A ureteral sheath includes a sheath seat and a sheath body connected to the sheath seat.

[0028] A method for applying a ureteral sheath includes the following steps:

[0029] Step 1: Connect the negative pressure device to the second body, insert the working endoscope from the proximal end of the first body, and deliver the ureteral sheath to the operating site of the human kidney;

[0030] Step 2: Achieve a seal between the first seat and the working mirror by rotating the sealing element;

[0031] Step 3: Insert the first finger into the handle, such as the index finger, and press it on the first seat. The second finger, such as the thumb, can press against the proximal end of the first seat or the seal, usually on the opposite side of the first finger's pressing position. Press the third finger on the handle, such as the middle finger, to achieve single-handed gripping of the ureteral sheath.

[0032] Step 4: Press the third finger on the handpiece to block the negative pressure control hole and adjust the negative pressure to expel the fluid or stones from the ureter.

[0033] Compared with the prior art, the beneficial effects of the present invention are: the present invention optimizes the existing sheath seat structure, and the hand-held part allows the doctor to hold the sheath seat with one hand. While being able to control the negative pressure control port with one hand, the doctor can also use the thumb and index finger of the same hand to stabilize the working endoscope, which facilitates the insertion and removal of the working endoscope without the need for personnel assistance. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the sheath seat in Example 1.

[0035] Figure 2 This is a schematic diagram of the structure of a sheath seat according to Embodiment 2.

[0036] Figure 3 This is a schematic diagram of another sheath seat in Embodiment 2.

[0037] Figure 4 for Figure 3 A sectional view.

[0038] Figure 5 This is a schematic diagram showing the positional structure of the first and second seats and the handheld component.

[0039] Figure 6 This is a schematic diagram showing the position and structure of the negative pressure control hole and the working channel.

[0040] Figure 7 This is a schematic diagram of the sheath seat in Example 4.

[0041] Figure 8 This is a schematic diagram of the sheath seat in Example 5.

[0042] Figure 9 This is a schematic diagram of the disassembled sheath seat in Example 5.

[0043] Figure 10 This is a cross-sectional view of one type of seal.

[0044] Figure 11 This is a cross-sectional view of another type of seal.

[0045] Figure 12 This is a schematic diagram of the sheath seat in Example 6.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1-First seat body, 2-Second seat body, 3-Handheld part, 3-1-First end, 3-2-Second end, 4-Handheld part, 5-Working channel one, 6-Working channel two, 7-Negative pressure control hole, 8-Sealing part, 9-Reinforcing rib, 10-Limiting part, 11-Rotary valve, 12-Gasket, 13-Silicone ring, 14-Matching groove, 15-Sub-seat body one, 16-Sub-seat body two, 17-Snap-fit ​​part one, 18-Snap-fit ​​part two, 19-Annular groove, 20-Annular protrusion, 21-Pressing groove. Detailed Implementation

[0048] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0049] Example 1

[0050] like Figure 1 As shown, an embodiment of the present invention provides a sheath holder, including a first seat 1, a second seat 2, and a handheld component 3 disposed on the second seat 2.

[0051] The first body 1 has a proximal end and a distal end, the proximal end (i.e. Figure 1 The right end of the first body 1 in the middle) is the entrance to the working mirror, and the distal end (i.e. Figure 1 The left end of the first body 1 is used to connect to the sheath body, which has a working channel 5 inside. The working endoscope enters the sheath body through the working channel 5 and finally enters the ureter.

[0052] The second seat 2 is connected to one side of the first seat 1, as follows: Figure 1As shown, the specific location is on the lower side of the first seat 1. The second seat 2 has a working channel 6 for connecting a negative pressure device. In the prior art, a negative pressure control hole 7 is generally opened directly on the second seat 2. By pressing and blocking the negative pressure control hole 7 with a finger, the liquid input by the working mirror can be sucked away by the negative pressure device. However, since the second seat 2 and the first seat 1 form an acute angle, when the sheath seat is held tightly with one hand, the finger will slide downwards. First, it is impossible to accurately control the closure of the negative pressure control hole 7. Second, it is difficult to operate and cannot fix the sheath seat.

[0053] Based on this, in this embodiment, a hollow handheld component 3 is provided on the second base 2. The handheld component 3 has two ends. The first end 3-1 of the handheld component 3 is connected to the second base 2, for example, at or near the middle of the length direction of the second base 2. The second end 3-2 extends downward, for example, becoming a free end, thereby forming a protruding structure that can support the hand. The handheld component 3 can restrict the fingers from sliding along the length direction of the second base 2, thereby preventing the sheath seat from being out of single-hand control due to hand slippage. In addition, in order to achieve precise control of the negative pressure control hole 7, in this embodiment, the negative pressure control hole 7 is opened on the pressing surface of the handheld component 3 (i.e., the contact surface between the handheld component 3 and the fingers). During operation, one finger presses on the first base 1 and the other finger presses on the handheld component 3, which can complete the single-hand fixation operation of the sheath seat, providing a basis for single-hand operation.

[0054] The groove depth of the negative pressure control hole 7 is the same as the side wall thickness of the handheld part 3, and it must penetrate the side wall of the handheld part 3. In addition, in some other embodiments, the center line of the negative pressure control hole 7 and the center line of the working channel 5 form an angle γ. In this embodiment, γ is taken as 45°. The specific angle of γ is not limited. Those skilled in the art can make adaptive settings according to the actual situation such as the operating habits and palm size of different doctors.

[0055] The negative pressure control hole 7 is not only located on the side of the handheld component 3 facing the first base 1, but can also be located on the side away from the first base 1. Furthermore, the negative pressure control hole 7 can be located in the middle of the first base 1 or near the connection point between the handheld component 3 and the first base 1. This embodiment uses the middle location as an example. Additionally, the shape and size of the negative pressure control hole 7 should be such that it can be blocked by a finger. Figure 1Besides the location of the negative pressure control hole 7, depending on the actual operating method, the negative pressure control hole 7 can also be located on the arc surface of the handheld part 3. Those skilled in the art can adapt the location of the negative pressure control hole 7 according to the actual situation. For different locations, the negative pressure control hole 7 can be blocked, adjusted, or opened by different finger pressures or slight changes in the pressure point and pressure center. Although it is not recommended to adjust the opening of the negative pressure control hole 7 by moving the fingers along the length direction of the handheld part 3 due to the limited movement distance along the length of the handheld part 3 (i.e., the extension direction of the handheld part body along its length, which is perpendicular to the length direction of the second seat 2 in some specific embodiments, i.e., β is 90°) and because it is difficult to exert force by holding the sheath with one hand, it is not recommended to move the fingers along the length direction of the handheld part 3. However, slight displacement of the fingers that close the negative pressure control hole 7 is not excluded in actual operation. For example, slight displacement can be made along the length direction of the handheld part 3 or in a direction perpendicular to that direction.

[0056] The projection shape of the negative pressure control hole 7 on the surface of the handheld part 3 can be rectangular, elliptical, circular, or waist-shaped, etc. The specific shape is not limited, but it is not recommended to have holes on the surface of the handheld part 3 that require the finger to move along the length direction, such as long strip holes or slits. In this embodiment, the negative pressure control hole 7 is waist-shaped, and its length should be as short as possible, not exceeding the size of the fingertip of a finger. Thus, when holding the sheath with one hand, the negative pressure can be closed and adjusted without moving a single finger. Those skilled in the art can make an adaptive choice according to the actual situation.

[0057] In some other embodiments, the negative pressure control hole 7 includes a plurality of strip holes, which are not interconnected with each other, and the plurality of strip holes extend along the circumference of the handheld part 3.

[0058] Example 2

[0059] Based on Embodiment 1, in order to further improve the accuracy of single-handed operation, the first base 1 of this embodiment is provided with a handhold 4. The handhold 4 is an arc-shaped structure (or a square structure, which is not limited). It is located on the upper side or the side of the first base 1 (taking the upper side as an example in this embodiment, the upper side is the top of the first base 1). Both ends of the handhold 4 are connected to the first base 1 to form a ring structure, that is, to provide a space for fingers to be inserted. Based on this, by inserting one finger into the handhold 4 and placing another finger on the handhold 3, the sheath seat can be gripped.

[0060] In addition, the hand-held part 4 is located between the connection position of the second base 2 and the first base 1 and the proximal end of the first base 1, and the hand-held part 3 can also be located directly below the hand-held part 4.

[0061] In addition, such as Figure 2 and Figure 3As shown, the proximal end of the first seat 1 of the sheath seat in this embodiment is provided with a sealing element 8, which is used to provide a seal when inserting instruments such as a ureteroscope. The sealing element 8 is a detachable structure, and the detachable method can be a threaded connection.

[0062] The materials of the first seat 1, the second seat 2, the handheld part 3, the handheld part 4, and the sealing part 8 in this embodiment can be polycarbonate, polypropylene, polyethylene, polyvinyl chloride, or nylon. Those skilled in the art can choose according to the actual situation.

[0063] Specifically, such as Figure 4 As shown, the sealing element 8 in this embodiment includes a rotary valve 11, a silicone ring 13, and a gasket 12 disposed between the rotary valve 11 and the silicone ring 13. The first seat 1 has a threaded connection at its proximal end that mates with the rotary valve 11, and also has a groove for accommodating the sealing element 8. The silicone ring 13, the gasket 12, and a portion of the rotary valve 11 are all located within this groove. The outer diameters of the silicone ring 13 and the gasket 12 are both larger than the diameter of the working channel 5, thereby limiting the position of the silicone ring 13 and preventing its movement. In some embodiments, apart from the internal deformable components, such as the silicone ring 13, most of the components of the sealing element 8, especially the exposed components, are rigid structures. In actual operation, unless the seal is adjusted, external forces will not affect the shape and stress of the deformable components, resulting in a more stable sealing effect in actual operation.

[0064] like Figure 10 and Figure 11 As shown, in some other embodiments, the silicone ring 13 has at least one mating groove 14 for mating with the rotary valve 11 or the gasket 12. The mating groove 14 can accommodate a part of the gasket 12 or a part of the rotary valve 11. Alternatively, the gasket 12 can be omitted. The depth of the mating groove 14 can be 1 / 10 to 9 / 10 of the thickness of the silicone ring 13. The shape of the mating groove 14 can be flared or chamfered, and its maximum outer diameter is not less than the outer diameter of the mating end of the rotary valve 11 and the silicone ring 13.

[0065] In use, rotating the rotary valve 11 causes the valve to push the gasket 12 against the silicone ring 13. The silicone ring 13 deforms under force and contracts inward, thereby clamping the working mirror located in the working channel 5 and preventing gaps between the working mirror and the inner wall of the working channel 5, thus achieving a sealing effect. In some other embodiments, the sealing element 8 is a rubber sealing cap, which is threaded or sleeved on the near end of the first base 1. A hole with an interference fit with the working mirror is opened at its center, which can also achieve a sealing effect.

[0066] Example 3

[0067] like Figures 5 to 6As shown, based on Embodiment 1 or Embodiment 2, the handheld part 3 of the sheath seat in this embodiment is trigger-shaped, crescent-shaped, or fan-shaped, which is more ergonomic and more comfortable and convenient to hold.

[0068] In addition, there is an included angle α between the handpiece 3 and the first base 1, where 30°≤α≤60°, and 45° is taken as an example in this embodiment. There is an included angle β between the handpiece 3 and the second base 2, where 70°≤β≤110°, and 90° is taken as an example in this embodiment. Furthermore, reinforcing ribs 9 are provided at the connection between the first base 1 and the second base 2 and at the connection between the second base 2 and the handpiece, so as to improve the strength of the sheath seat.

[0069] Example 4

[0070] like Figure 7 As shown, based on Embodiment 1, Embodiment 2, or Embodiment 3, the second seat 2 of the sheath holder in this embodiment is further provided with a limiting part 10. The limiting part 10 has an arc-shaped structure, with one end connected to the second seat 2 and the other end connected to the distal end of the handheld component 3 in the extension direction. The three are interconnected to form a space that allows fingers to be inserted. Alternatively, the limiting part 10 may not contact the handheld component 3, but both ends of it may be connected to the second seat 2, directly forming a space that allows fingers to be inserted. The handheld component 3 is located within this space, which can prevent the sheath holder from slipping out of the hand and improve the stability of single-handed operation.

[0071] Example 5

[0072] like Figure 8 and Figure 9 As shown, this embodiment proposes a sheath seat. The difference between the sheath seat in the above embodiment is that the first seat 1 of the sheath seat in this embodiment is a split structure, which includes a second sub-seat 16 connected to the second seat 2 and a first sub-seat 15 connected to the seal 8. The two are connected in a detachable manner, and the detachable manner is not limited to threaded connection, plug connection, fastener connection or snap-fit ​​connection.

[0073] In this embodiment, a snap-fit ​​connection is used as an example. Specifically, a snap-fit ​​component 17 and a snap-fit ​​component 28 extending in the radial direction are fixedly installed on the first sub-base 15 and the second sub-base 16, respectively. After rotating the first sub-base 15 or the second sub-base 16, the snap-fit ​​component 17 and the snap-fit ​​component 28 can be locked together and cannot move relative to each other, thereby fixing the first sub-base 15 and the second sub-base 16.

[0074] In this embodiment, when the first sub-base 15 and the second sub-base 16 are mated, rotating the first sub-base 15 or the second sub-base 16 allows the first snap-fit ​​17 or the second snap-fit ​​18 to move circumferentially until the first snap-fit ​​17 moves to the side of the second snap-fit ​​18 opposite to the first sub-base 15, or the second snap-fit ​​18 moves to the side of the first snap-fit ​​17 opposite to the second sub-base 16 (the first snap-fit ​​17 is located between the second snap-fit ​​18 and the first sub-base 15), thus completing the fixation of the two. Wherein, the first snap-fit ​​17 moves to the side of the second snap-fit ​​18 opposite to the first sub-base 15, which means that the first snap-fit ​​17 moves to the side of the second snap-fit ​​18 away from the first sub-base 15. The positional relationship after the movement is: the second snap-fit ​​18 is located between the first snap-fit ​​15 and the first sub-base 17.

[0075] During disassembly, rotating the first sub-base 15 or the second sub-base 16 will release the engagement of the first snap-fit ​​component 17 and the second snap-fit ​​component 18, thus separating the first sub-base 15 and the second sub-base 16. To achieve the above-mentioned engagement function, the first snap-fit ​​component 17 and the second snap-fit ​​component 18 can be L-shaped structures, but are not limited to this shape. Those skilled in the art can make adaptive modifications according to the actual situation.

[0076] In addition, the sealing effect at the connection between the first sub-body 15 and the second sub-body 16 can be improved by adding a sealing gasket.

[0077] In some other embodiments, on the two contact surfaces of the first sub-body 15 and the second sub-body 16, one contact surface is provided with an annular protrusion 20, and the other contact surface is provided with an annular groove 19 that mates with the annular protrusion 20. After assembly, the two are in a plug-in state, which can play a certain role in sealing and positioning. A sealing ring can be fitted on the annular protrusion 20 to further improve the sealing effect. Of course, the annular protrusion 20 can be made of rubber material, which is press-fitted with the annular groove 19. Although this fitting method will have some resistance when rotating the first sub-body 15 for locking, it can play a better sealing role.

[0078] Example 6

[0079] like Figure 12 As shown, based on Embodiment 5, this embodiment also opens the negative pressure control hole 7 on the pressing surface of the handheld part 3 (i.e. the contact surface between the handheld part 3 and the finger). The cross-sectional shape of the negative pressure control hole 7 is circular. Furthermore, the handheld part 3 is provided with a pressing groove 21, which is a groove-shaped structure that is located on the surface of the handheld part 3 at the edge of the negative pressure control hole 7 and is recessed inward.

[0080] In practice, doctors use their middle or ring finger to cover the negative pressure control hole 7 to perform negative pressure control. Considering the space limitations at the operating point and the difficulty in exerting force to move a single finger along the length of the handheld part when holding the sheath with one hand, a single circular hole is more conducive to adjustment. At the same time, the designed pressing groove 21 makes it easier for the fingertip to seal the negative pressure control hole 7.

[0081] Example 7

[0082] This embodiment proposes a ureteral sheath, which includes a sheath seat as described in Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, or Embodiment 6, and a sheath body connected to the sheath seat.

[0083] The method of using a ureteral sheath is as follows:

[0084] Step 1: Connect the negative pressure device to the second body, insert the working endoscope from the proximal end of the first body, and deliver the ureteral sheath into the human renal pelvis;

[0085] Step 2: Achieve a seal between the first seat and the working mirror by rotating the sealing element;

[0086] Step 3: Insert one finger into the handle and press it on the first seat, and press the other finger on the handle to grasp the ureteral sheath;

[0087] Step 4: Adjust the negative pressure by pressing your finger on the handpiece to block the negative pressure control hole and drain the fluid or stones from the ureter.

[0088] Specifically, in use, connect the negative pressure device to the second base 2, insert the working endoscope from the proximal end of the first base 1, then insert the middle finger into the handle 4, and press the ring finger on the handle 3 to grasp the ureteral sheath. The thumb and index finger pinch the working endoscope at the seal 8. The seal 8 can be rotated to achieve a seal as needed, or the position of the working endoscope can be finely adjusted at the inlet. When it is necessary to aspirate liquid, use the finger pressing the handle 3 to block the negative pressure control hole 7, and the liquid will be discharged under negative pressure. This is how to operate.

[0089] The grip posture is not limited to the above usage method. For example, during operation, the index finger is inserted into the handle part 4 and pressed on the first base 1, and the middle finger is pressed on the handle part 3 to adjust the negative pressure control hole 7.

[0090] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit and essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0091] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sheath seat, characterized in that, The utility model relates to a sheath tube seat, comprising: a first seat body (1) having a working channel one (5) in it; and a second seat body (2) connected to one side of the first seat body (1) and having a working channel two (6) in it, which communicates with the working channel one (5); wherein, the second seat body (2) is provided with a handheld piece (3), the handheld piece (3) has an internal cavity communicating with the working channel two (6), and a negative pressure control hole (7) is formed on the outer surface of the handheld piece (3) and communicates with the internal cavity.

2. The sheath hub of claim 1, wherein, The handheld piece (3) has two ends, wherein the first end (3-1) is connected to the middle part of the second seat body (2), and the second end (3-2) extends upward or downward, thereby forming a structure capable of supporting fingers.

3. The hub of claim 2, wherein, The negative pressure control hole (7) is formed on the side of the handheld piece (3) facing the first seat body (1) or the side away from the first seat body (1), and is located at the middle part of the first seat body (1) or the position close to the connecting point of the handheld piece (3) and the first seat body (1).

4. The sheath hub of claim 1, wherein, The handheld piece (3) and the first seat body (1) have an included angle alpha, 30 DEG <= alpha <= 60 DEG, and the handheld piece (3) and the second seat body (2) have an included angle beta, 70 DEG <= beta <= 110 DEG.

5. The sheath hub of claim 1, wherein, The projection shape of the negative pressure control hole (7) on the surface of the handheld piece (3) is rectangular, oval, circular or waist-shaped, or the negative pressure control hole (7) comprises a plurality of strip-shaped holes not communicating with each other, and the plurality of strip-shaped holes extend along the circumferential direction of the handheld piece (3).

6. The hub of claim 5, wherein, The surface of the handheld piece (3) near the edge position of the negative pressure control hole (7) is provided with a pressing groove (21) recessed inward.

7. The sheath hub of claim 1, wherein, The distal end of the first seat body (1) is used for connecting a sheath body, and the proximal end is the inlet of a working mirror, and a sealing element (8) is mounted on the proximal end of the first seat body (1).

8. The hub of claim 7, wherein, The sealing element (8) comprises a rotary valve (11), a silica gel ring (13) and a gasket (12) arranged between the rotary valve (11) and the silica gel ring (13); A groove for accommodating the silica gel ring (13) is formed in the first seat body (1), and the outer diameter of the silica gel ring (13) is greater than the diameter of the working channel one (5); The rotary valve (11) is threadedly connected with the first seat body (1), and rotating the rotary valve (11) can make a part of the rotary valve (11) extend into the first seat body (1) and push the gasket (12) to abut against the silica gel ring (13), so that the silica gel ring (13) is deformed under stress, thereby sealing the working channel one (5).

9. The sheath hub of claim 1, wherein, The handheld piece (3) is in the shape of a trigger, a crescent or a fan.

10. The sheath hub of claim 1, wherein, A handheld part (4) is arranged on the first seat body (1), the handheld part (4) is an arc structure, which is located on the upper side or the side of the first seat body (1), the handheld part (4) and the first seat body (1) form a ring structure, and fingers can be inserted into the ring structure to hold the sheath tube seat.

11. The sheath hub of claim 1, wherein, The handheld piece (3) is further connected with a limiting part (10), the limiting part (10) is connected with the second seat body (2), and a space capable of inserting fingers is formed between the limiting part (10), the second seat body (2) and the handheld piece (3).

12. The sheath hub of claim 1, wherein, The first seat body (1) is a split structure, which comprises a second sub-seat body (16) connected with the second seat body (2) and a first sub-seat body (15) connected with the sealing element (8); The first sub-seat body (15) and the second sub-seat body (16) are connected in a detachable manner, which is screw connection, plug connection or buckle connection.

13. The hub of claim 12, wherein, The first sub-seat body (15) and the second sub-seat body (16) are respectively fixedly provided with a clamping element one (17) and a clamping element two (18) extending in the radial direction. When the first sub-seat body (15) and the second sub-seat body (16) are connected, the clamping element one (17) or the clamping element two (18) can be moved circumferentially by rotating the first sub-seat body (15) or the second sub-seat body (16) until the clamping element one (17) moves to the side of the clamping element two (18) away from the first sub-seat body (15) or the clamping element two (18) moves to the side of the clamping element one (17) away from the second sub-seat body (16).

14. The sheath hub of claim 13, wherein, Further comprising a ring-shaped convex part (20) and a ring-shaped groove (19) matched with the ring-shaped convex part (20), the ring-shaped convex part and the ring-shaped groove (19) are respectively arranged on the two contact surfaces of the first sub-seat body (15) and the second sub-seat body (16).

15. The sheath hub of claim 8, wherein, The silica gel ring (13) has at least an abutment groove (14) for abutting with the rotary valve (11) or the gasket (12), the depth of the abutment groove (14) is 1 / 10-9 / 10 of the thickness of the silica gel ring (13).

16. The hub of claim 15, wherein, The abutment groove (14) is flared.

17. A ureteral sheath characterized by, The sheath further comprises a sheath body connected with the sheath seat.

Images