Negative pressure suction sheath and endoscope system

Abstract

The invention discloses a negative pressure suction sheath and an endoscope system. The negative pressure suction sheath comprises a sheath tube seat, a hard sheath tube and a soft sheath tube, and the sheath tube seat is provided with a communicating cavity in a penetrating mode; the near end of the hard sheathing canal is connected with the sheathing canal seat and is communicated with the communicating cavity; the near end of the soft sheathing canal is used for being detachably connected with the far end of the hard sheathing canal. According to the negative pressure suction sheath composed of the hard sheath tube, the soft sheath tube and the sheath tube base, when the negative pressure suction sheath is used, the hard sheath tube can be independently used in cooperation with a hard endoscope, the combination of the hard sheath tube and the soft sheath tube can be used in cooperation with the soft endoscope, the soft sheath tube is bent and then can enter a bent channel, and therefore only one channel can be formed in a patient, and the patient can be prevented from being damaged. The patient trauma is reduced. When the endoscope is used, the hard endoscope and the soft endoscope are used through different combinations, and the economic burden of a patient is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to a negative pressure suction sheath and an endoscope system. BACKGROUND

[0002] With the rapid development of science and technology and medical technology, the method for treating kidney stones is also constantly innovating. Percutaneous nephrolithotomy (PNCL) as a kind of efficient and safe minimally invasive surgery has become the "gold standard" for treating large and complex kidney stones (usually greater than 2 cm or stag horn stones). The core principle is to use a negative pressure suction sheath to establish a minimally invasive channel from the body surface to the kidney collection system from the patient's back skin, and use an endoscope to enter the kidney through the channel, and under direct vision, cooperate with a laser or a pneumatic ballistic stone crushing device to crush the stones, and finally use water flow to suck the crushed stones out of the body under the action of the negative pressure suction sheath.

[0003] If the stones are in different calyx positions in the kidney, then during the stone extraction process, a hard endoscope and a soft endoscope are used for different calyx positions. The soft endoscope can be bent along the channel to achieve entry into the internal calyx position. For this, a passive bending negative pressure suction sheath and a non-bending negative pressure suction sheath are needed. However, the traditional passive bending negative pressure suction sheath cannot be compatible with both hard and soft endoscopes, so two specifications of negative pressure suction sheaths are used for the same stone extraction surgery, causing economic burden to the patient. SUMMARY

[0004] The present application aims to provide a negative pressure suction sheath and an endoscope system, in which the hard sheath tube and the soft sheath tube adopt different combined states to cooperate with the use of hard and soft endoscopes, thereby reducing patient trauma and economic burden.

[0005] According to a first aspect of the present application, the present application provides a negative pressure suction sheath, comprising: a sheath tube seat, the sheath tube seat being provided with a communication cavity in a through manner; a hard sheath tube, a proximal end of the hard sheath tube being connected with the sheath tube seat and being in communication with the communication cavity; a soft sheath tube, a proximal end of the soft sheath tube being used for detachable connection with a distal end of the hard sheath tube.

[0006] In an embodiment, a distal end of the hard sheath tube is provided with a first connecting tube, a distal end of the first connecting tube is provided with a first connecting part; a proximal end of the soft sheath tube is provided with a second connecting tube, a proximal end of the second connecting tube is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected.

[0007] In an embodiment, the first connecting part is arranged inside the distal end of the first connecting tube.

[0008] In an embodiment, the length of the hard sheath tube is greater than the length of the soft sheath tube.

[0009] In an embodiment, The hard sheath tube comprises an inner layer hard tube, an outer layer hard tube, and a first intermediate spiral layer, the first intermediate spiral layer is spirally wound on the outer wall of the inner layer hard tube, the outer layer hard tube is sleeved outside the first intermediate spiral layer, and the inner wall of the outer layer hard tube is partially connected with the outer wall of the inner layer hard tube; The soft sheath tube comprises an inner layer soft tube, an outer layer soft tube, and a second intermediate spiral layer, the second intermediate spiral layer is spirally wound on the outer wall of the inner layer soft tube, the outer layer soft tube is sleeved outside the second intermediate spiral layer, and the inner wall of the outer layer soft tube is partially connected with the outer wall of the inner layer soft tube; The pitch of the first intermediate spiral layer is less than or equal to the pitch of the second intermediate spiral layer.

[0010] In an embodiment, the hardness of the outer layer hard tube is greater than the hardness of the outer layer soft tube, and the hardness of the inner layer hard tube is greater than the hardness of the inner layer soft tube.

[0011] In an embodiment, further comprising a negative pressure tube, the negative pressure tube is connected to the sheath tube base and in airflow communication with the communication cavity; the negative pressure tube is used to connect a negative pressure device.

[0012] In an embodiment, the negative pressure tube is further provided with a pressure regulating assembly, the pressure regulating assembly is used to adjust the negative pressure in the negative pressure tube.

[0013] In an embodiment, the proximal end of the sheath tube base is further provided with a blocking piece, the blocking piece is provided with a lead-through passage, the lead-through passage is used to lead through an endoscope.

[0014] According to the second aspect of the present application, the present application provides an endoscope system, comprising a hard endoscope or a soft endoscope, and the negative pressure suction sheath.

[0015] The negative pressure suction sheath and the endoscope system according to the above embodiment, the negative pressure suction sheath composed of the hard sheath tube and the soft sheath tube and the sheath tube base, in use, the hard sheath tube can be used alone with the hard endoscope, the combination of the hard sheath tube and the soft sheath tube can be used with the soft endoscope, so that the soft sheath tube is bent and can enter the curved channel, thus, only one channel is opened for the patient, reducing the trauma of the patient. In use, different combinations are used to realize the use of the hard endoscope and the soft endoscope, significantly reducing the economic burden of the patient. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A perspective view of the negative pressure suction sheath provided in the present application; Figure 2 An exploded view of the negative pressure suction sheath provided in the present application; Figure 3 A schematic view of the connection between the hard sheath tube and the soft sheath tube in one embodiment in the present application; Figure 4 A schematic view of the connection between the hard sheath tube and the soft sheath tube in another embodiment in the present application; Figure 5 A schematic view of the structure of the hard sheath tube in the present application; Figure 6 A schematic view of the structure of the soft sheath tube in the present application.

[0017] Reference signs: The negative pressure suction sheath 100, the sheath tube base 10, the hard sheath tube 20, the first protruding part 201, the inner layer hard tube part 21, the outer layer hard tube part 22, the first intermediate spiral layer 23, the first spiral wire 231, the soft sheath tube 30, the second protruding part 301, the inner layer soft tube part 31, the outer layer soft tube part 32, the second intermediate spiral layer 33, the second spiral wire 331, the first connecting tube 40, the first connecting part 41, the first clamping groove 42, the guide protrusion 43, the second connecting tube 50, the second connecting part 51, the second clamping buckle 52, the insertion slot 53, the insertion part 54, the negative pressure tube 60, the pressure regulating assembly 61. DETAILED DESCRIPTION

[0018] The present application will be further described in details through specific embodiments in combination with the drawings. In different embodiments, similar elements are associated with similar element signs. In the following embodiments, many details are described in order to make the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification in order to avoid the core part of the present application being overwhelmed by too much description, and it is not necessary to describe these related operations in details for those skilled in the art according to the description in the specification and the general technical knowledge in the art.

[0019] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate way to form various embodiments, and the operation steps involved in each embodiment can also be sequentially adjusted or adjusted in a manner that can be easily seen by those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing one embodiment, and do not mean that the composition and / or order is necessary.

[0020] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0021] During percutaneous nephrolithotomy (PNCL), if the stones are located in different calyces within the kidney, different minimally invasive channels are typically created through the skin on the patient's back to access the kidney, depending on the location of the stone. A rigid endoscope and rigid sheath are used to fragment the stone, while a flexible endoscope and flexible sheath are used to aspirate the fragments. The need to create different channels throughout the procedure causes trauma to the patient. Furthermore, the use of different rigid and flexible sheaths at different locations increases the patient's financial burden.

[0022] To address the aforementioned issues, this application provides a negative pressure suction sheath and endoscope, which only requires establishing a minimally invasive channel. For stones in deeper calyxes, a combination of rigid and flexible sheaths is used in conjunction with a flexible endoscope to reach the calyx, reducing patient trauma and financial burden.

[0023] In the following embodiments, the proximal end is the end closer to the user, and the distal end is the end farther away from the user. For example, the distal end is the end inserted into the patient's body, and the proximal end is the end closer to the operator (medical staff). Example 1

[0024] See Figure 1 and Figure 2 As shown, the negative pressure suction sheath 100 provided in this embodiment includes a sheath seat 10, a rigid sheath 20, and a soft sheath 30.

[0025] The sheath seat 10 has a through-hole (not shown in the figure), the proximal end of the rigid sheath 20 is connected to the sheath seat 10, and the inner cavity of the rigid sheath 20 is in communication with the through-hole of the sheath seat 10.

[0026] The rigid sheath 20 and the sheath seat 10 are always connected. Alternatively, the rigid sheath 20 and the sheath seat 10 can be considered to be connected in a detachable manner, and the two are connected during use.

[0027] The proximal end of the soft sheath 30 is detachably connected to the distal end of the hard sheath 20. The soft sheath 30 is used relative to the hard sheath 20, which does not passively bend, while the soft sheath 30 can passively bend under the action of force.

[0028] In practical use, when the operator uses a rigid endoscope, the sheath seat 10 connects only to the rigid sheath 20. The rigid sheath 20 is used to insert the rigid endoscope, specifically by inserting it into the interior of the rigid sheath 20 through the communicating cavity of the sheath seat 10. When the operator uses a flexible endoscope, the flexible sheath 30 is connected to the rigid sheath 20. The connected rigid sheath 20 and flexible sheath 30 are used to insert the flexible endoscope, again by inserting it into the interior of the rigid sheath 20 and flexible sheath 30 through the communicating cavity of the sheath seat 10.

[0029] Of course, when the sheath seat 10 is only connected to the rigid sheath 20, the rigid sheath 20 can also be used to insert a flexible endoscope, provided that the length of the rigid sheath 20 meets the requirements. After the flexible sheath 30 is connected to the rigid sheath 20, the connected rigid sheath 20 and flexible sheath 30 can also be used to insert a flexible endoscope.

[0030] In this embodiment, the negative pressure suction sheath 100, composed of a rigid sheath 20, a flexible sheath 30, and a sheath seat 10, can be used in conjunction with a rigid endoscope. Alternatively, the rigid sheath 20 can be used alone with a rigid endoscope, or in combination with the flexible sheath 30 with a flexible endoscope. This allows the flexible sheath 30 to bend and enter a curved channel, thus requiring only one access point for the patient and reducing trauma. By using different combinations to achieve the use of both rigid and flexible endoscopes, the economic burden on patients is significantly reduced.

[0031] Understandably, the rigid sheath 20 is a straight, inflexible sheath, while the soft sheath 30 is a passively bendable sheath. The two are connected in a detachable manner to form the negative pressure suction sheath 100. Obviously, the rigid sheath 20 is harder than the soft sheath 30 to achieve the corresponding functional requirements.

[0032] like Figures 1-4 As shown, in this embodiment, the distal end of the rigid sheath 20 is provided with a first connecting tube 40, and the distal end of the first connecting tube 40 is provided with a first connecting part 41. The proximal end of the soft sheath 30 is provided with a second connecting tube 50, and the proximal end of the second connecting tube 50 is provided with a second connecting part 51. The first connecting part 41 and the second connecting part 51 are detachably connected, thereby connecting the rigid sheath 20 and the soft sheath 30.

[0033] The first connecting pipe 40 and the second connecting pipe 50 are both made of polymer material by injection molding. The first connecting part 41 and the second connecting part 51 are detachably connected by a mechanical structure, such as by screw connection or snap connection.

[0034] The first connecting tube 40 is connected to the rigid sheath 20 by adhesive bonding, and the second connecting tube 50 is also connected to the soft sheath 30 by adhesive bonding. In actual use, the first connecting tube 40 and the rigid sheath 20 are always connected, and the second connecting tube 50 and the soft sheath 30 are always connected. Therefore, when using the rigid sheath 20 alone, the first connecting tube 40, as the distal end of the rigid sheath 20, needs to avoid causing scratches to the patient during insertion into the patient's passage. To address this, the first connecting part 41 is located inside the distal end of the first connecting tube 40, which prevents the first connecting part 41 from contacting the patient's passage during insertion, thereby avoiding the risk of scratches.

[0035] like Figure 3 As shown, the rigid sheath 20 is further provided with a first protrusion 201, and the soft sheath 30 is further provided with a second protrusion 301. The first protrusion 201 is inserted into the first connecting tube 40 and is bonded to the inner wall of the first connecting tube 40. The second protrusion 301 is inserted into the second connecting tube 50 and is bonded to the inner wall of the second connecting tube 50, which can ensure the firmness of the connection between the rigid sheath 20 and the first connecting tube 40 and the soft sheath 30 and the second connecting tube 50.

[0036] In this embodiment, the distal end of the first connecting tube 40 is rounded. Of course, when using the interconnected rigid sheath 20 and soft sheath 30, the distal end of the soft sheath 30 must also be rounded to further avoid the risk of scratching the patient.

[0037] See Figure 2 and Figure 3 As shown, in one embodiment of this application, the first connecting part 41 is an internal thread provided inside the distal end of the first connecting pipe 40, and the second connecting part 51 is an external thread provided on the outer periphery of the proximal end of the second connecting pipe 50. The first connecting part 41 and the second connecting part 51 are detachably connected by the external thread being screwed into the internal thread.

[0038] like Figure 4 As shown, in another embodiment of this application, a first slot 42 is provided inside the distal end of the first connecting tube 40, and a second buckle 52 is provided inside the proximal end of the second connecting tube 50. The first connecting tube 40 and the second connecting tube 50 are connected by the first slot 42 and the second buckle 52 to achieve a detachable connection.

[0039] In this embodiment, the inner wall of the first connecting pipe 40 is also provided with a guide protrusion 43, and the first slot 42 is provided on the guide protrusion 43. The second connecting pipe 50 is also provided with a slot 53, and the second buckle 52 is provided on the slot 53, so that when the first connecting pipe 40 and the second connecting pipe 50 are connected, the guide is provided by inserting the slot 53 into the guide protrusion 43, and the first slot 42 and the second buckle 52 are quickly engaged.

[0040] In a preferred embodiment, the second connecting tube 50 is further provided with a plug portion 54, which is used to be plugged into the interior of the first connecting tube 40, and a slot 53 is formed in the plug portion 54.

[0041] In this embodiment, when the negative pressure suction sheath 100 is inserted into the patient's channel, a rigid sheath 20 is first inserted into the channel in conjunction with a rigid endoscope. Since the channel is usually quite long, whether the rigid sheath 20 is used alone or in combination with a soft sheath 30, the length of the rigid sheath 20 must be greater than the length of the soft sheath 30 to meet the usage requirements.

[0042] See Figure 1 and Figure 2 As shown, the negative pressure suction sheath 100 provided in this application also includes a negative pressure tube 60, which is connected to the sheath seat 10. The inner lumen of the negative pressure tube 60 is in airflow communication with the communicating cavity of the sheath seat 10. The negative pressure tube 60 is used to connect a negative pressure device. After the flexible endoscope is inserted through the communicating cavity of the sheath seat 10 into the rigid sheath 20 and the flexible sheath 30, a negative pressure channel is formed between the flexible endoscope and the inner lumens of the rigid sheath 20 and the flexible sheath 30. Under the negative pressure generated by the negative pressure device, the broken stones can be suctioned out from the patient's lesion site.

[0043] The negative pressure tube 60 is also equipped with a pressure regulating component 61, which is used to adjust the negative pressure within the negative pressure tube 60 to meet the suction requirements of stones of different sizes. For example, the pressure regulating component 61 can adjust the negative pressure within the negative pressure tube 60 by adjusting the flow area of ​​the negative pressure tube 60. Specifically, the pressure regulating component 61 has a plate-like structure and is inserted into the middle of the negative pressure tube 60 perpendicular to its axial direction. By adjusting the displacement of the pressure regulating component 61 in the axial direction of the negative pressure tube 60, the area of ​​the negative pressure tube 60 blocked by the pressure regulating component 61 is adjusted, thereby adjusting the flow area of ​​the negative pressure tube 60 and achieving the purpose of adjusting the negative pressure.

[0044] Because the communicating cavity of the sheath seat 10 is through-hole, the distal end of the sheath seat 10 is connected to the rigid sheath 20, thus communicating with the inner cavity of the rigid sheath 20. When the negative pressure suction sheath 100 is not in use, the other end of the communicating cavity needs to be sealed to prevent foreign objects from entering the interior. Therefore, in this embodiment, a sealing member 11 is also provided at the proximal end of the sheath seat 10. This sealing member 11 is connected to the sheath seat 10 through a connector 12 to prevent loss due to improper use.

[0045] In this embodiment, the sealing member 11 is provided with a guide channel. After the sealing member 11 is sealed on the sheath seat 10, the guide channel is connected to the communicating cavity of the sheath seat 10 for guiding the endoscope (including rigid endoscope and flexible endoscope).

[0046] See Figure 5 As shown, the rigid sheath 20 includes an inner rigid tube 21, an outer rigid tube 22, and a first intermediate spiral layer 23. The first intermediate spiral layer 23 is spirally wound around the outer wall of the inner rigid tube 21. The outer rigid tube 22 is sleeved on the outside of the first intermediate spiral layer 23, and the inner wall of the outer rigid tube 22 is partially connected to the outer wall of the inner rigid tube 21. A portion of the inner rigid tube 21 extends outward beyond the outer rigid tube 22 to form a first protrusion 201.

[0047] See Figure 6 As shown, the flexible sheath 30 includes an inner flexible tube 31, an outer flexible tube 32, and a second intermediate spiral layer 33. The second intermediate spiral layer 33 is spirally wound around the outer wall of the inner flexible tube 31, and the outer flexible tube 32 is sleeved outside the second intermediate spiral layer 33. The inner wall of the outer flexible tube 32 is partially connected to the outer wall of the inner flexible tube 31. A portion of the inner flexible tube 31 extends outward beyond the outer flexible tube 32 to form a second protrusion 301.

[0048] The inner rigid tube 21 and the outer rigid tube 22 are made of a relatively hard polymer material, while the inner soft tube 31 and the outer soft tube 32 are made of a relatively soft polymer material, making the hardness of the rigid sheath 20 greater than that of the soft sheath 30.

[0049] In this embodiment, the first intermediate spiral layer 23 and the second intermediate spiral layer 33 can be formed by winding metal round wires or flat wires, and are respectively wound on the outer wall of the inner rigid tube 21 and the outer wall of the inner soft tube 31.

[0050] See Figure 5As shown, the first intermediate spiral layer 23 is made of a first spiral wire 231 (metal round wire or flat wire) wound around the outer wall of the inner rigid tube 21. Two adjacent portions of the first spiral wire 231 wound on the inner rigid tube 21 have a first pitch L1. (See also...) Figure 6 As shown, the second intermediate spiral layer 33 is wound around the outer wall of the inner rigid tube 31 with a second spiral wire 331 (metal wire or braided flat wire). The two adjacent portions of the second spiral wire 331 wound on the inner soft tube 31 have a second pitch L1. In this embodiment, the first pitch L1 of the first intermediate spiral layer 23 is less than or equal to the second pitch L2 of the second intermediate spiral layer 33, which further makes the hardness of the rigid sheath 20 greater than that of the soft sheath 30.

[0051] The material of the first intermediate spiral layer 23 and the material of the second intermediate spiral layer 33 can be the same or different, depending on the actual needs.

[0052] In this embodiment, the inner rigid tube 21, the outer rigid tube 22, the inner soft tube 31, and the outer soft tube 32 are all made of polymer materials. The hardness of the outer rigid tube 22 is greater than that of the outer soft tube 32, and the hardness of the inner rigid tube 21 is greater than that of the inner soft tube 31, so that the soft sheath 30 can be passively bent relative to the rigid sheath 20.

[0053] The hardness of the sheath depends on the hardness of the outer tube's polymer material and the pitch of the middle spiral layer. Since the inner tube's wall is thin, it has little effect on the hardness. It mainly serves to make the inner wall smooth and reduce friction, facilitating the passage of the endoscope. Therefore, the inner hard tube 21 and the inner soft tube 31 can be made of the same material, both of which can be made of tetrafluoroethylene (PTEE). Example 2

[0054] This embodiment provides an endoscope system, including a rigid endoscope or a flexible endoscope, and the negative pressure suction sheath 100 from Embodiment 1. When using a rigid endoscope, the flexible sheath 30 is detached from the rigid sheath 20, and the rigid endoscope is inserted into the rigid sheath 20 through the communicating cavity of the sheath seat 10. When using a flexible endoscope, the flexible sheath 30 is connected to the rigid sheath 20, and the flexible endoscope is inserted into both the rigid sheath 20 and the flexible sheath 30 through the communicating cavity of the sheath seat 10. For the specific structure and function of the negative pressure suction sheath 100, please refer to the above embodiments.

[0055] In summary, the negative pressure suction sheath and endoscope system provided in this application, consisting of a rigid sheath, a flexible sheath, and a sheath seat, allows for several uses. The rigid sheath can be used alone with a rigid endoscope, while the combination of the rigid and flexible sheaths allows for use with a flexible endoscope. This allows the flexible sheath to bend and enter a curved channel, thus requiring only one access point for the patient and reducing trauma. Furthermore, the ability to combine rigid and flexible endoscopes through different combinations significantly reduces the financial burden on patients.

[0056] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A negative pressure suction sheath, characterized in that, include: A sheath seat, wherein the sheath seat is provided with a through-hole; A rigid sheath, the proximal end of which is connected to the sheath seat and communicates with the communicating cavity; A soft sheath, the proximal end of which is detachably connected to the distal end of the hard sheath.

2. The negative pressure suction sheath as described in claim 1, characterized in that, The rigid sheath has a first connecting tube at its distal end, and a first connecting portion at its distal end; the soft sheath has a second connecting tube at its proximal end, and a second connecting portion at its proximal end; the first connecting portion and the second connecting portion are detachably connected.

3. The negative pressure suction sheath as described in claim 2, characterized in that, The first connecting part is located inside the distal end of the first connecting tube.

4. The negative pressure suction sheath as described in claim 1, characterized in that, The length of the rigid sheath is greater than the length of the soft sheath.

5. The negative pressure suction sheath as described in claim 1, characterized in that, The rigid sheath includes an inner rigid tube, an outer rigid tube, and a first intermediate spiral layer. The first intermediate spiral layer is spirally wound around the outer wall of the inner rigid tube. The outer rigid tube is sleeved on the outside of the first intermediate spiral layer, and the inner wall of the outer rigid tube is partially connected to the outer wall of the inner rigid tube. The flexible sheath includes an inner flexible tube, an outer flexible tube, and a second intermediate spiral layer. The second intermediate spiral layer is spirally wound around the outer wall of the inner flexible tube. The outer flexible tube is sleeved on the outside of the second intermediate spiral layer, and the inner wall of the outer flexible tube is partially connected to the outer wall of the inner flexible tube. The pitch of the first intermediate spiral layer is less than or equal to the pitch of the second intermediate spiral layer.

6. The negative pressure suction sheath as described in claim 5, characterized in that, The hardness of the outer rigid pipe is greater than that of the outer soft pipe, and the hardness of the inner rigid pipe is greater than that of the inner soft pipe.

7. The negative pressure suction sheath as described in claim 1, characterized in that, It also includes a negative pressure tube, which is connected to the sheath seat and communicates with the airflow in the communicating cavity; the negative pressure tube is used to connect to a negative pressure device.

8. The negative pressure suction sheath as described in claim 7, characterized in that, The negative pressure pipe is also equipped with a pressure regulating component, which is used to adjust the negative pressure in the negative pressure pipe.

9. The negative pressure suction sheath as described in claim 1, characterized in that, The proximal end of the sheath seat is also provided with a sealing element, which has a guide channel for inserting the endoscope.

10. An endoscope system, characterized in that, Includes rigid or flexible endoscopes, and a negative pressure suction sheath as described in any one of claims 1-9.

Images