Negative pressure suction sheath

Abstract

The utility model discloses a kind of negative pressure suction sheaths, including mirror sheath tube assembly, mirror sheath tube assembly includes sheath tube body, the lateral wall of sheath tube body is equipped with water outlet, the outer wall of sheath tube body is equipped with the rotating sleeve of cover water outlet, two sealing elements are equipped between rotating sleeve and sheath tube body, the lateral wall of rotating sleeve is connected with and rotating sleeve intercommunication negative pressure suction connector.The utility model can realize rotating suction sheath adjustment passive bending mirror sheath tube front end's swing angle.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a negative pressure suction sheath. Background Technology

[0002] Ureteroscopic lithotripsy is one of the surgical methods for treating kidney stones in the upper ureter. During the procedure, a channel sheath is used to guide the flexible endoscope into the kidney to break up the stones. Water flows through the inlet of the flexible endoscope into the kidney and is discharged through the gap between the endoscope and the sheath.

[0003] Currently, a newer and more popular type of channel sheath is the flexible negative pressure suction sheath. During the procedure, the sheath tip can be passively bent to reach the stone location by actively bending the flexible endoscope tip. The fragments are then suctioned out with water flow through the gaps between the endoscope and the sheath. However, the angle of swing of the actively bent flexible endoscope tip is limited. If it is necessary to adjust the swing angle of the passively bent endoscope tip, the suction sheath needs to be rotated. However, the negative pressure suction tube connector on the suction sheath is integrally formed with the suction sheath. When the suction tube connector is connected to the external negative pressure drainage tube, it restricts the rotation of the suction sheath, thus limiting the swing angle of the passively bent endoscope tip. The range of lithotripsy may not be comprehensive enough. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a negative pressure suction sheath that can adjust the swing angle of the passively bent end of the mirror sheath by rotating the suction sheath.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] A negative pressure suction sheath includes a mirror sheath assembly, wherein the mirror sheath assembly includes a sheath body, the side wall of the sheath body is provided with a water outlet hole, the outer wall of the sheath body is fitted with a rotating sleeve covering the water outlet hole, two sealing elements are provided between the rotating sleeve and the sheath body, and the side wall of the rotating sleeve is connected to a negative pressure suction connector communicating with the rotating sleeve.

[0007] A sealing element is used to seal the gap between the sheath body and the rotating sleeve. When the sheath body is rotated, the negative pressure suction joint on the sealing sleeve will not rotate with the sheath body.

[0008] In some embodiments, first annular grooves are provided above and below the water outlet and on the side wall of the sheath body, respectively.

[0009] In some embodiments, a flow guiding cavity is provided inside the rotating sleeve. The flow guiding cavity can prevent the inner wall of the rotating sleeve from directly contacting the sheath body and blocking the water outlet.

[0010] In order to secure the seal, in some embodiments, a second annular groove is provided above and below the flow guide cavity and on the inner wall of the rotating sleeve.

[0011] Further expanding upon the above scheme, the sealing element is a sealing ring, with the inner wall of the sealing ring contacting the first annular groove and the outer wall contacting the second annular groove.

[0012] Compared with the prior art, this application achieves at least the following beneficial effects: the negative pressure suction sheath sets the sheath body and the negative pressure drainage tube as separate parts, and uses a sealing element to seal the gap between the sheath body and the rotating sleeve, so as to prevent water from flowing out from between the sheath body and the rotating sleeve while ensuring that the sheath body can rotate; after ensuring the sealing, the negative pressure suction tube does not rotate with the sheath body during rotation, and the sheath body can drive the passively bent end of the endoscope sheath to adjust the corresponding angle for lithotripsy. Attached Figure Description

[0013] One or more embodiments of this application will now be described by way of example only with reference to the accompanying drawings, in which:

[0014] Figure 1 This is a perspective view of a negative pressure suction sheath according to one embodiment of this application;

[0015] Figure 2 This is a front sectional view of the negative pressure suction sheath of this application;

[0016] Figure 3 for Figure 2 A partial view of point A in the middle;

[0017] Figure 4 This is a three-dimensional view of the sheath body in the negative pressure suction sheath of this application;

[0018] Figure 5 This is a three-dimensional view of the rotating sleeve and negative pressure suction tube in the negative pressure suction sheath of this application.

[0019] The following are the labels in the diagram: 1. Sheath body; 11. Water outlet; 12. First annular groove; 13. Limiting groove; 2. Fiber optic guide tube; 3. Rotating sleeve; 31. Flow guiding cavity; 32. Limiting circle edge; 33. Second annular groove; 4. Mirror sheath tube; 5. Negative pressure suction tube; 51. Negative pressure control port; 6. Sealing element. Detailed Implementation

[0020] The present application will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0021] In the description of this application, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0022] To address the shortcomings of existing technologies that cannot adjust the swing angle of the passively bent end of the suction sheath by rotating it, the inventors, after careful analysis, discovered that the main reason for this problem lies in the fact that the negative pressure suction tube connector and the suction sheath are integrally formed. When the negative pressure suction tube connector is connected to the external negative pressure drainage tube, rotating the negative pressure suction sheath will first cause the external negative pressure drainage tube to pull on the negative pressure suction connector, making it difficult for the negative pressure suction sheath to rotate; secondly, forcibly rotating the negative pressure suction sheath may cause the connection between the external negative pressure drainage tube and the negative pressure suction connector to break; furthermore, forcibly rotating the negative pressure suction sheath may cause the external negative pressure drainage tube to become entangled on the negative pressure suction sheath, and the negative pressure drainage tube may bend when bending, which can easily block the pipe and prevent the negative pressure suction from being achieved. All three of these situations may affect the smooth progress of the stone crushing operation. Based on the above analysis, the inventors have made structural improvements to the negative pressure suction sheath.

[0023] like Figure 1-5 As shown, in at least one embodiment of a negative pressure suction sheath of this application, a scope sheath assembly is included. The scope sheath assembly includes a sheath body 1 made of medical plastic material. The sheath body 1 has a cylindrical hollow structure. The top of the sheath body 1 is equipped with a closed hole that prevents most of the liquid from flowing out while allowing the flexible scope to enter (this is prior art, and all existing negative pressure suction sheaths are equipped with this). The side wall of the sheath body 1 is provided with at least one water outlet hole 11 (in this embodiment, the number of water outlet holes 11 is four, which are equidistantly arranged on the side wall of the sheath body 1). The outer wall of the sheath body 1 is fitted with a cylindrical hollow plastic rotating sleeve 3 that covers the water outlet hole 11. An annular sealing element 6 is installed in the upper and lower sections between the rotating sleeve 3 and the sheath body 1. The side wall of the rotating sleeve 3 is connected to a negative pressure suction connector that communicates with the rotating sleeve 3. The body of the negative pressure suction connector is a strip-shaped plastic round tube, and a negative pressure control port 51 for adjusting the negative pressure is installed on its side wall (this is prior art).

[0024] Two annular grooves 12 are provided on the sheath body 1. The two annular grooves 12 are respectively arranged above and below the water outlet 11. The inner wall of the first annular groove 12 is arc-shaped.

[0025] The rotating sleeve 3 has a flow guiding cavity 31 inside. The inner diameter of the flow guiding cavity 31 is larger than the inner diameter of the rotating sleeve 3, so that the inner wall of the flow guiding cavity 31 does not contact the outer wall of the sheath body 1. If the inner wall of the flow guiding cavity 31 contacts the outer wall of the sheath body 1, the inner wall of the flow guiding cavity 31 in contact with the sheath body 1 may block the water outlet 11 when the sheath body 1 is rotated, resulting in the inability to perform negative pressure drainage. After the flow guiding cavity 31 is set, the negative pressure draws the liquid into the flow guiding cavity 31, and it enters the negative pressure suction pipe 5 from the flow guiding cavity 31 for discharge, so that the water outlet 11 will not be blocked.

[0026] The inner wall of the rotating sleeve 3 is provided with two annular second annular grooves 33, which are respectively arranged above and below the flow guide cavity 31, and the inner wall of the second annular groove 33 is arc-shaped.

[0027] The sealing element 6 is a sealing ring. The purpose of setting the first annular groove 12 and the second annular groove 33 is to clamp the sealing element 6 and restrict its displacement or dislodgement. Specifically, the inner wall of the sealing ring contacts the first annular groove 12, and the outer wall contacts the second annular groove 33. The sealing ring is clamped by rotating the second annular groove 33 on the sleeve 3. The sealing ring made of rubber will deform to a certain extent, filling the first annular groove 12 and the second annular groove 33, so that it will not be displaced.

[0028] A rubber sealing ring seals the gap between the rotating sleeve 3 and the sheath body 1. Due to the low elastic modulus of rubber, it can undergo a certain amount of compression deformation under axial preload, forming an initial sealing interface. When there is radial runout of the shaft, the rubber can provide a certain amount of elastic compensation, allowing the sheath body 1 to rotate while maintaining the sealing contact.

[0029] To further prevent the rotating sleeve 3 from shifting and causing the sealing ring to shift and fail to seal, inwardly facing limiting round edges 32 are provided at the bottom and bottom of the rotating sleeve 3. Limiting grooves 13 are provided on the side wall of the sheath body 1 for the two limiting round edges 32 to engage. The two limiting grooves 13 are located above the first annular groove 12 above the outlet and below the first annular groove 12 below the outlet. After the limiting round edge 32 engages with the limiting groove 13, it can limit the displacement of the rotating sleeve 3. In addition, the cooperation between the limiting round edge 32 and the limiting groove 13 forms a semi-closed structure, which also has a certain function of blocking the liquid from flowing out.

[0030] Above the water outlet 11 and on the side wall of the sheath body 1, there is a fiber optic guide tube 2. The top of the fiber optic guide tube 2 is open, and the bottom is closed. The bottom of the fiber optic guide tube 2 is connected to the inside of the sheath body 1. In conventional surgical procedures, a 200µm laser fiber is introduced into the flexible endoscope to reach the tip of the endoscope for lithotripsy. However, due to the size limitation of the closed hole into which the flexible endoscope enters, laser fibers with a diameter of 550µm or more cannot be introduced. Therefore, a fiber optic guide tube 2 with a larger inner diameter is provided on the side wall of the sheath body 1, which can extend into a large laser fiber (550µm) for lithotripsy, improving the efficiency of lithotripsy. Inside the hole connecting the fiber optic guide tube 2 and the sheath body 1, a silicone membrane that is easy for the fiber optic to puncture should be placed to block some of the fluid from flowing out.

[0031] When using the negative pressure suction sheath, first connect the sheath body 1 to the endoscope sheath 4 via a threaded connection. Then, insert the flexible endoscope into the sealing hole of the sheath body 1 and insert the laser fiber into the fiber optic guide tube 2. Connect the external negative pressure drainage tube to the negative pressure suction tube 5 on the rotating sleeve 3. The front end of the endoscope sheath 4 is passively bent to reach the stone location for lithotripsy. When it is necessary to adjust the swing angle of the passively bent end of the endoscope sheath 4, first hold the negative pressure suction tube 5 to restrict its rotation, and then rotate the sheath body 1. The sheath body 1 drives the endoscope sheath 4 to rotate, thereby causing the front end of the passively bent endoscope sheath 4 to swing. This achieves the function of adjusting the swing angle of the front end of the passively bent endoscope sheath 4 by rotating the suction sheath, resulting in a more comprehensive lithotripsy range.

[0032] It should be understood that all the above embodiments are exemplary and not restrictive. Various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of this application should be within the protection scope of this application.

Claims

1. A negative pressure suction sheath, characterized in that, The device includes a mirror sheath assembly, which includes a sheath body. The side wall of the sheath body has a water outlet hole. The outer wall of the sheath body is fitted with a rotating sleeve that covers the water outlet hole. There are two sealing elements between the rotating sleeve and the sheath body. The side wall of the rotating sleeve is connected to a negative pressure suction connector that communicates with the rotating sleeve.

2. The negative pressure suction sheath according to claim 1, characterized in that, The water outlet is provided with first annular grooves above and below it, and on the side wall of the sheath body.

3. The negative pressure suction sheath according to claim 2, characterized in that, The rotating sleeve has a flow guide cavity inside.

4. The negative pressure suction sheath according to claim 3, characterized in that, The upper and lower parts of the flow guide cavity and the inner wall of the rotating sleeve are provided with second annular grooves.

5. The negative pressure suction sheath according to claim 4, characterized in that, The sealing element is a sealing ring, with its inner wall in contact with the first annular groove and its outer wall in contact with the second annular groove.

6. The negative pressure suction sheath according to claim 1, characterized in that, The bottom of the rotating sleeve and the bottom of the bottom are respectively provided with inward limiting round edges, and the side wall of the sheath body is provided with limiting grooves for the two limiting round edges to engage.

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