Negative pressure suction sheath, endoscope assembly and method of use thereof

Abstract

The present application belongs to the field of medical device technology, and specifically relates to a negative pressure suction sheath, an endoscope assembly, and a method of using the same. The distal end of the negative pressure suction sheath is provided with a sheath tube that can be sleeved on the outside of an active bending section. Part of the area of ​​the tube section of the sheath tube close to its own distal opening is radially expanded to form an expansion portion. The flow area of ​​the inner cavity of the expansion portion is greater than the flow area of ​​the inner cavity of other parts of the sheath tube. The active bending section can drive at least part of the tube section of the sheath tube close to its own distal opening to bend; the maximum distance between each part of the bent active bending section in the direction of its own extension and the inner wall of the tube section of the sheath tube bent by the active bending section is constantly changing, and the expansion portion can make the minimum value of each maximum distance greater than the size of the target object. The present application can solve the problem of easy jamming when using the current sheath tube to aspirate stones and wait for the aspirated material.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and specifically relates to a negative pressure suction sheath, an endoscope assembly and a method of using the same. Background Art

[0002] Negative pressure suction sheaths are often used in urological endoscopic examinations or surgeries. They can establish a surgical channel in the urinary system to assist the endoscope and surgical instruments in passing through the urethra, ureter and other cavities, thereby improving the effectiveness and safety of examinations and treatments.

[0003] When using a negative pressure suction sheath to remove kidney stones, the sheath of the negative pressure suction sheath can be placed into the kidney using a guide wire, and then the insertion portion of the endoscope can be inserted into the sheath to observe and break up the stones. When the stone is on the side of the sheath, the insertion portion can be used to drive the distal end of the sheath to bend, so that the sheath is directed toward the stone and the stone is sucked into the gap between the insertion portion and the sheath, thereby expelling the stone. However, in practice, when the insertion portion is used to drive the distal end of the sheath to bend to suck the lateral stone, the problem of unsmooth stone removal is prone to occur. Summary of the invention

[0004] The purpose of the present application is to provide a negative pressure suction sheath, an endoscope assembly and a method of using the same, which can solve the problem of stagnation that easily occurs when using the current sheath tube to aspirate stones and waiting for the aspirated material.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application provides a negative pressure suction sheath, wherein the distal end of the negative pressure suction sheath is provided with a sheath tube that can be sleeved on the outside of an active bending section, a portion of the tube section of the sheath tube close to its own distal opening is radially expanded to form an expansion portion, the flow area of ​​the inner cavity of the expansion portion is greater than the flow area of ​​the inner cavity of other parts of the sheath tube, and the active bending section can drive at least part of the tube section of the sheath tube close to its own distal opening to bend;

[0007] The maximum distances between each part of the curved active bending section in its extending direction and the inner wall of the tube section of the sheath tube bent by the active bending section continuously change, and the expansion part can make the minimum value of each maximum distance larger than the size of the target object in the object to be sucked.

[0008] In a second aspect, the present application provides an endoscope assembly, including an endoscope and the above-mentioned negative pressure suction sheath, wherein the sheath can be sleeved outside the insertion portion of the endoscope, and the insertion portion includes an active bending section.

[0009] In a third aspect, the present application provides a method for using an endoscope assembly, which is applied to the above-mentioned endoscope assembly, comprising:

[0010] Inserting the insertion portion into the sheath;

[0011] The active bending section is used to drive at least part of the tube section of the sheath tube close to the distal opening thereof to bend, so that the distal end of the sheath tube faces the object to be aspirated;

[0012] Use the sheath to aspirate and expel the aspirated material.

[0013] The beneficial technical effects of this application are as follows:

[0014] In the present application, the tube section of the sheath tube close to its distal opening forms an expansion portion, the inner cavity of the expansion portion is connected to the inner cavity of other parts of the sheath tube, the flow area of ​​the inner cavity of the expansion portion is larger than the flow area of ​​the inner cavity of other parts of the sheath tube, when the negative pressure suction sheath of the present application is used, the insertion part of the endoscope can be inserted into the sheath tube, and the active bending section of the insertion part can drive at least part of the tube section of the sheath tube close to its own distal opening to bend, because when the active bending section is bent, different parts of the active bending section will press against specific positions of the sheath tube, so that the bent active bending section can extend itself. The maximum distances between each part in the direction and the inner wall of the tube section bent by the active bending section of the sheath tube are constantly changing. After the expansion part is set in the present application, the size of the inner cavity of the expansion part is larger than the size of the inner cavity of other parts of the sheath tube. In this way, the expansion part can be used to increase the minimum value of each maximum distance, so that the minimum value of each maximum distance is larger than the size of the target object in the object to be aspirated. In this way, the target object can smoothly pass through the gap between the bent active bending section and the inner wall of the tube section bent by the active bending section of the sheath tube, thereby solving the problem of unsmooth discharge of stones while waiting for aspiration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the cooperation between the curved sheath tube and the curved active curved section disclosed in the prior art, and a schematic cross-sectional diagram along line a to line g;

[0016] Figure 2 Schematic diagram of the cooperation between the sheath tube and the active bending section disclosed in the first embodiment of the present application Figure 1 ;

[0017] Figure 3 Schematic diagram of the cooperation between the sheath tube and the active bending section disclosed in the first embodiment of the present application Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the cooperation between the sheath tube and the active bending section disclosed in the second embodiment of the present application;

[0019] Figure 5 This is a schematic diagram of the process of the sheath tube and the active bending section cooperating to extract the object to be sucked disclosed in the second embodiment of the present application;

[0020] Figure 6This is a schematic diagram of the process of cooperation between the sheath tube and the active bending section disclosed in the third embodiment of the present application;

[0021] Figure 7 This is a schematic diagram of the process of cooperation between the sheath tube and the active bending section disclosed in the fourth embodiment of the present application;

[0022] Figure 8 This is a schematic diagram of the structure of the negative pressure suction sheath disclosed in the embodiment of the present application;

[0023] Fig. 9 A flowchart of a method for using an endoscope assembly disclosed in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100, sheath; 110, expansion part; 112, first guide surface; 113, second guide surface; 120, passive bending section; 200, operating handle; 300, insertion part; 310, active bending section. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0028] The negative pressure suction sheath, endoscope assembly and method of use provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0029] In each embodiment of the present application, "proximal" and "distal" refer to the position of the negative pressure suction sheath and its components relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal" and the end farther from the user is designated as the "distal".

[0030] like Figure 1 As shown, during the operation in which the insertion portion 300 and the sheath tube 100 are used together to remove stones and wait for the suction material, there is a suction gap between the endoscope insertion portion 300 and the inner wall of the sheath tube 100, so that the stones are discharged from the suction gap; of course, in order to facilitate the doctor to obtain the location of the stones, especially in the operation of kidney stone removal, the endoscope needs to be inserted into the renal calyx through the natural cavity or percutaneous kidney to remove stones in various areas of the renal calyx. Therefore, in order to avoid causing great trauma to the patient's kidneys, most endoscopes have a controllable bending function. Therefore, in order to adapt to the bending of the active bending section 310 of the endoscope insertion portion 300, the distal end of the sheath tube 100 adapted thereto in the prior art also has the ability of passive bending, that is, the active bending section 310 of the endoscope can drive the distal end of the sheath tube 100 to bend during the bending process.

[0031] The inventors discovered that, in actual surgical procedures, when the active bending section 310 drives the sheath tube 100 to be in a bent state, different parts of the active bending section 310 will press against specific positions of the sheath tube 100. Therefore, in the extension direction of the active bending section 310, the maximum distances between the various parts of the curved active bending section 310 in its own extension direction and the inner wall of the curved sheath tube 100 are unevenly distributed. In other words, the maximum distances between the various parts of the curved active bending section 310 in its own extension direction and the inner wall of the curved sheath tube 100 are constantly changing. Therefore, in the process of aspirating stones, stones whose size is equal to or slightly larger than the minimum value of the maximum distances may be blocked between the curved sheath tube 100 and the curved active bending section 310, resulting in poor stone removal.

[0032] Here, the maximum distance between each part of the curved active bending section 310 in its own extension direction and the inner wall of the curved sheath tube 100 is explained. Figure 1 In views a to g, since the diameter of the active bending segment 310 is smaller than the diameter of the sheath tube 100, there must be a gap between the curved active bending segment 310 and the curved sheath tube 100, and the gap surrounds the curved active bending segment 310. Therefore, the distances between various circumferential regions of a part of the curved active bending segment 310 in its own extension direction and the inner wall of the sheath tube 100 are not equal, and the maximum value of the distances between various circumferential regions of this part of the curved active bending segment 310 and the sheath tube 100 is: the maximum distance between this part of the curved active bending segment 310 and the curved sheath tube 100.

[0033] like Figures 2 to 8As shown, the embodiment of the present application discloses a negative pressure suction sheath, the distal end of the negative pressure suction sheath is provided with a sheath tube 100 that can be sleeved on the outside of the active bending section 310, the partial area of ​​the tube section of the sheath tube 100 close to its own distal opening is radially expanded to form an expansion portion 110, the flow area of ​​the inner cavity of the expansion portion 110 is greater than the flow area of ​​the inner cavity of the other parts of the sheath tube 100, and the active bending section 310 can drive at least part of the tube section of the sheath tube 100 close to its own distal opening to bend, that is, the active bending section 310 can drive all parts of the tube section of the sheath tube 100 close to its own distal opening to bend, or the active bending section 310 can also drive only a part of the tube section of the sheath tube 100 close to its own distal opening to bend. Specifically, the other part of the sheath tube 100 refers to the part of the sheath tube 100 located outside the expansion section 110, and the other part of the sheath tube 100 can be a tube section of equal diameter. The negative pressure suction sheath here can also include an operating handle 200, and the distal end of the operating handle 200 is connected to the proximal end of the sheath tube 100.

[0034] The maximum distances between the parts of the active bending section 310 in the direction of its own extension and the inner wall of the tube section of the sheath tube 100 bent by the active bending section 310 are constantly changing, and the expansion part 110 can make the minimum value of each of the maximum distances greater than the size of the target object in the object to be aspirated. The target object here refers to the object to be aspirated whose size is equal to or slightly greater than the minimum value of the maximum distances between the parts of the active bending section 310 in the direction of its own extension and the sheath tube 100, such as stones, and the size of the target object here is equal to or slightly greater than half of the difference in diameter between the sheath tube 100 and the active bending section 310 in the prior art.

[0035] In the present application, the tube section of the sheath tube 100 close to its own distal opening forms an expansion portion 110, and the inner cavity of the expansion portion 110 is connected to the inner cavity of other parts of the sheath tube 100. The flow area of ​​the inner cavity of the expansion portion 110 is larger than the flow area of ​​the inner cavity of other parts of the sheath tube 100. When the negative pressure suction sheath of the present application is used, the insertion portion 300 of the endoscope can be inserted into the sheath tube 100, and the active bending section 310 of the insertion portion 300 can drive at least part of the tube section of the sheath tube 100 close to its own distal opening to bend. When the active bending section 310 is bent, different parts of the active bending section 310 will press against specific positions of the sheath tube 100, thereby making the active bending The maximum distances between each part of the segment 310 in the direction of its own extension and the inner wall of the tube section of the sheath tube 100 bent by the active bending segment 310 are constantly changing. After the expansion part 110 is set in the present application, the size of the inner cavity of the expansion part 110 is larger than the size of the inner cavity of other parts of the sheath tube 100. In this way, the expansion part 110 can be used to increase the minimum value of each maximum distance, so that the minimum value of each maximum distance is greater than the size of the target object in the object to be aspirated. In this way, the target object can smoothly pass through the gap between the bent active bending segment 310 and the inner wall of the tube section of the sheath tube 100 bent by the active bending segment 310, thereby solving the problem of unsmooth discharge of stones while waiting for aspiration.

[0036] In addition, the use of the negative pressure suction sheath of the present application can improve the passability of the sheath tube 100 without increasing the overall diameter of the sheath tube 100, thereby solving the problem of unsmooth discharge of stones while waiting for the suctioned material.

[0037] The embodiment of using the expansion part 110 to make the minimum value of each maximum distance greater than the size of the target object includes the following two optional embodiments:

[0038] In a first alternative embodiment, see Figure 2 and Figure 3 The tube section of the sheath tube 100 close to its distal opening includes a passive bending section 120, and the active bending section 310 can drive the passive bending section 120 to bend. The maximum distance between each part of the bent active bending section 310 in its own extension direction and the inner wall of the bent passive bending section 120 changes continuously.

[0039] The passive bending section 120 includes a first tube section and a second tube section. The first tube section and the second tube section are equal in length. The second tube section is located proximal to the first tube section. The expansion portion 110 is disposed on the first tube section.

[0040] In this embodiment, the expansion part 110 is formed on the first tube section of the passive bending section 120. When the active bending section 310 drives the passive bending section 120 to bend, the expansion part 110 will bend along with the passive bending section 120. And because the expansion part 110 is arranged on the first tube section, that is, after the active bending section 310 is inserted into the passive bending section 120 and drives the passive bending section 120 to bend, the minimum value of each maximum distance is greater than the size of the target object, so that the target object can smoothly pass through the gap between the bent active bending section 310 and the inner wall of the tube section of the sheath tube 100 bent by the active bending section 310, thereby solving the problem of unsmooth discharge of stones waiting for suction. It can be seen that the operation of discharging stones waiting for suction using the structure of this embodiment is simple.

[0041] See also Figure 5 In the first figure, after the active bending segment 310 is inserted into the passive bending segment 120 and drives the passive bending segment 120 to bend, the maximum distance between the narrowest part of the curved passive bending segment 120 and the curved active bending segment 310 is the smallest. If the expansion portion 110 is located proximal to the narrowest part, the target object will still be stuck between the curved sheath 100 and the curved active bending segment 310.

[0042] Therefore, in a second alternative embodiment, see Figures 4 to 7 The tube section of the sheath tube 100 close to its distal opening includes a passive bending section 120 and an expansion section. The passive bending section 120 is located at the distal side of the expansion section. A partial area of ​​the expansion section radially expands to form an expansion portion 110. The active bending section 310 can drive the passive bending section 120 to bend. The bent active bending section 310 can move relative to the bent passive bending section 120 so that a part of the bent active bending section 310 can enter the expansion portion 110, so that the minimum value of each maximum distance is greater than the size of the target object.

[0043] In the present embodiment, the passive bending section 120 and the expansion section are two different tube sections, and therefore the expansion portion 110 is not formed on the passive bending section 120. The maximum distances between the various parts of the curved active bending section 310 in its own extension direction and the inner wall of the curved passive bending section 120 are constantly changing. Since the curved active bending section 310 in the present embodiment can move relative to the curved passive bending section 120, even if the narrowest part of the curved passive bending section 120 is located on the far side of the expansion portion 110, the curved active bending section 310 is controlled to move relative to the curved passive bending section 120 so that a part of the curved active bending section 310 enters the expansion portion 110, so that the expansion portion 110 is used to make the minimum value of each maximum distance greater than the size of the target object, thereby introducing the target object stuck between the curved passive bending section 120 and the curved active bending section 310 into the expansion portion 110, so as to solve the problem of the target object being stuck between the curved sheath 100 and the curved active bending section 310.

[0044] Please note that Figure 5 In the first figure, there is also a narrow space between the insertion part 300 and the tube section of the sheath tube 100 located near the expansion part 110. However, since the insertion part 300 does not cause the tube section of the sheath tube 100 located near the expansion part 110 to bend, the tube section of the sheath tube 100 located near the expansion part 110 and the portion of the insertion part 300 located in the tube section both remain in a relatively straight state, and the portion of the insertion part 300 located in the tube section has better mobility in the sheath tube 100. When the target enters the above-mentioned narrow space, the target can push the insertion part 300 to increase the narrow space, thereby preventing the target from getting stuck.

[0045] In an optional embodiment, the rigidity of the expansion section is greater than the rigidity of the passive bending section 120, so that the rigidity of the expansion portion 110 can be greater than the rigidity of the passive bending section 120. In this embodiment, the rigidity of the expansion portion 110 is greater than the rigidity of the passive bending section 120, so that the active bending section 310 can be prevented from driving the expansion portion 110 to bend, that is, the active bending section 310 can only drive the passive bending section 120 to bend during the bending process, but cannot drive the expansion portion 110 to bend, which can reduce the length of the sheath tube 100 to be bent, thereby reducing the overlap length between the bent sheath tube 100 and the bent active bending section 310, so that it is easier to drive the bent active bending section 310 to move. Of course, the rigidity of the expansion section can also be less than or equal to the rigidity of the passive bending section 120, and this application is not limited to this.

[0046] And / or, in an optional embodiment, the rigidity of the tube section of the sheath tube 100 located proximal to the expansion section is greater than the rigidity of the passive bending section 120. This embodiment can prevent the tube section of the sheath tube 100 located proximal to the expansion section from bending, thereby preventing a narrow space from being formed proximal to the expansion section, thereby preventing the target from being stuck. Of course, the rigidity of the tube section of the sheath tube 100 located proximal to the expansion section can also be equal to or less than the rigidity of the passive bending section 120. At this time, the active bending section 310 can be controlled by controlling the length of the active bending section 310, the passive bending section 120 or the expansion section so that the active bending section 310 is not located in the tube section of the sheath tube 100 located proximal to the expansion section, thereby preventing the active bending section 310 from driving the tube section of the sheath tube 100 located proximal to the expansion section to bend.

[0047] In some embodiments, see Figure 7 The length of the passive bending section 120 is greater than the length of the expansion portion 110 along the axial direction of the sheath tube 100 .

[0048] by Figure 7 Taking the perspective shown as an example, when the active bending segment 310 drives the passive bending segment 120 to bend, the lower side of the distal end of the active bending segment 310 will abut against the lower side of the distal end of the passive bending segment 120, and the upper side of the middle part of the active bending segment 310 will abut against the upper side of the middle part of the passive bending segment 120, thereby realizing the bending of the passive bending segment 120, and the part with the smallest maximum distance between the bent passive bending segment 120 and the bent active bending segment 310 (i.e., the narrowest part) is close to the middle part of the passive bending segment 120. Therefore, the longer the length of the passive bending segment 120 is, the larger the distance between the middle part of the passive bending segment 120 and the expansion portion 110 is, and it takes a longer time and is more difficult to move the middle part of the bent active bending segment 310 into the expansion portion 110.

[0049] In addition, in the process of pulling the bent active bending section 310 backward, the position where the lower side of the distal end of the active bending section 310 abuts against the lower side of the passive bending section 120 will gradually move away from the distal opening of the passive bending section 120, thereby causing the direction of the distal opening of the passive bending section 120 to change, such as lifting upward, and the greater the distance the active bending section 310 is pulled backward, the greater the change in the direction of the distal opening of the passive bending section 120, and excessive change in direction may cause the distal opening of the passive bending section 120 to no longer face the object to be sucked. At this time, it is necessary to change the position of the negative pressure suction sheath and the endoscope so that the distal opening of the passive bending section 120 is directed back to the object to be sucked, and the operation is relatively complicated.

[0050] In an alternative embodiment, see Figures 4 to 6, the length of the passive bending section 120 is less than the length of the expansion section 110 along the axial direction of the sheath tube 100. In this embodiment, the length of the passive bending section 120 is less than the length of the expansion section 110 along the axial direction of the sheath tube 100, so that the problem of the target object being stuck can be solved by only pulling the bent active bending section 310 backwards a small distance, thereby shortening the time for pulling the bent active bending section 310 and reducing the difficulty of pulling the bent active bending section 310. In addition, since the distance that the bent active bending section 310 is pulled backwards is small, the change in the direction of the distal opening of the passive bending section 120 is small, which allows the distal opening of the passive bending section 120 to still face the object to be sucked, which does not require changing the position of the negative pressure suction sheath and the endoscope, thereby simplifying the operation.

[0051] In an alternative embodiment, see Figure 4 , Figure 5 and Figure 7 The expansion portion 110 is annular, that is, all regions of the expansion section along its own circumference expand outward to form the expansion portion 110. The proximal edge of the expansion portion 110 ( Figure 4 The lower edge of the viewing angle) and the far edge ( Figure 4 The upper edge in the perspective) can support the active bending section 310 after bending, the inner cavity of the expansion part 110 includes a accommodating space and an avoidance space distributed from the inside to the outside, the accommodating space can accommodate the active bending section 310 after bending, and the inner wall surface of the expansion part 110 can be separated from the active bending section 310 after bending by the avoidance space.

[0052] In this embodiment, the proximal edge and the distal edge of the expansion portion 110 can support the active bending section 310 after bending, and a part of the active bending section 310 after bending will enter the expansion portion 110 and be accommodated in the accommodation space. At this time, the part of the active bending section 310 located in the accommodation space is separated from the inner wall surface of the expansion portion 110, and an escape space is formed between the two, which can reduce the contact area between the bent active bending section 310 and the expansion portion 110, so that it is easier to pull the bent active bending section 310 backward. Of course, the expansion portion 110 may not be annular, and in this case, the expansion section expands outward along a part of its circumference.

[0053] Alternatively, see Figure 6In another optional embodiment, the expansion portion 110 is annular, and the inner wall surface of the expansion portion 110 is an arc surface convex outward, and the curvature of the inner wall surface of the expansion portion 110 is the same as the maximum curvature of the active bending section 310, that is, the active bending section 310 after bending fits with the inner wall surface of the expansion portion 110. In this embodiment, the active bending section 310 after bending fits with the inner wall surface of the expansion portion 110, so that the outward expansion size of the expansion portion 110 can be reduced, that is, the radial width of the expansion portion 110 can be reduced, so as to facilitate the insertion of the sheath tube 100 into the human body; and the active bending section 310 after bending fits with the inner wall surface of the expansion portion 110, and the active bending section 310 after bending can also be moved away from the flow channel in the expansion portion 110 for the passage of the object to be sucked, so as to prevent the active bending section 310 after bending from occupying a large space in the flow channel, so as to improve the passability of the object to be sucked.

[0054] In an alternative embodiment, see Figure 2 The first guide surface 112 is provided at the distal end of the expansion part 110. The distance between the first guide surface 112 and the axis of the sheath tube 100 gradually increases along the direction from the distal end to the proximal end of the sheath tube 100. The expansion part 110 can be easily introduced into the human body by using the first guide surface 112. Optionally, the first guide surface 112 can be an inclined surface, an arc surface, a conical surface, etc. Here, the first guide surface 112 can be a closed structure or a non-closed structure in its circumferential direction.

[0055] And / or, in an optional embodiment, please continue to refer to Figure 2 The proximal end of the expansion part 110 is provided with a second guide surface 113, and the distance between the second guide surface 113 and the axis of the sheath tube 100 gradually decreases along the direction from the distal end to the proximal end of the sheath tube 100, so that the expansion part 110 can be easily guided out of the human body by using the second guide surface 113. Optionally, the second guide surface 113 can be an inclined surface, an arc surface, a conical surface, etc., and the second guide surface 113 here can be a closed structure or a non-closed structure in its own circumferential direction.

[0056] The embodiment of the present application also discloses an endoscope assembly, including an endoscope and the negative pressure suction sheath described in any of the above embodiments, the sheath tube 100 can be sleeved outside the insertion portion 300 of the endoscope, and the insertion portion 300 includes an active bending section 310. Since the endoscope assembly includes the negative pressure suction sheath described in any of the above embodiments, the endoscope assembly has the beneficial effects of the aforementioned negative pressure suction sheath, which will not be repeated here. The endoscope referred to in the embodiment of the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiment of the present application does not specifically limit the type of endoscope.

[0057] In an optional embodiment, an identification structure is provided on the insertion portion 300, and an identification portion is provided on the negative pressure suction sheath. When the curved active bending section 310 moves relative to the curved passive bending section 120, and the identification structure corresponds to the identification portion, the expansion portion 110 can make the minimum value of each maximum distance greater than the size of the target object, so that when the identification structure corresponds to the identification portion, the pulling of the curved active bending section 310 can be stopped, thereby preventing the distal end of the active bending section 310 from entering the expansion portion 110 due to misoperation, so as to avoid the passive bending section 120 returning to a straight line and then no longer facing the object to be sucked. The identification structure here can be an identification line, an identification pattern, a pointer, etc., and the identification portion can also be an identification line, an identification pattern, a pointer, the edge of the negative pressure suction sheath itself, etc.

[0058] like Fig. 9 As shown, the embodiment of the present application also discloses a method for using an endoscope assembly, which is applied to the above-mentioned endoscope assembly, including:

[0059] S100 , inserting the insertion portion 300 into the sheath tube 100 .

[0060] S200, using the active bending section 310 to drive at least part of the tube section of the sheath tube 100 close to its own distal end opening to bend, so that the distal end of the sheath tube 100 faces the object to be aspirated.

[0061] S300 , using the sheath tube 100 to aspirate and discharge the substance to be aspirated.

[0062] After the expansion part 110 is provided in the present application, the size of the inner cavity of the expansion part 110 is larger than the size of the inner cavity of other parts of the sheath tube 100. In this way, the expansion part 110 can be used to increase the minimum value of each maximum distance, so that the minimum value of each maximum distance is larger than the size of the target object. In this way, the target object can smoothly pass through the gap between the curved active bending section 310 and the inner wall of the tube section bent by the active bending section 310, thereby solving the problem of unsmooth discharge of target objects such as stones.

[0063] In an optional embodiment, the method of use further includes:

[0064] S400, determining whether the sheath tube 100 is stuck in discharging the object to be aspirated.

[0065] Specifically, whether it is stuck can be determined by observing the flow rate of the suctioned material discharged from the sheath 100 with the human eye; or a flow meter can be set on the sheath 100, and whether it is stuck can be determined by comparing the flow rate measured by the flow meter with the preset flow rate; or, the discharge pipeline connected to the sheath 100 can be touched by hand to determine whether it is stuck by touch.

[0066] S500, if yes, pull the insertion part 300 to make the curved active curved section 310 gradually move away from the distal end surface of the sheath tube 100, until the sheath tube 100 can smoothly discharge the object to be sucked, then stop pulling the insertion part 300.

[0067] In this embodiment, the bent active bending section 310 can move relative to the tube section of the sheath 100 bent by the active bending section 310. Therefore, even if the part with the smallest maximum distance between the tube section of the sheath 100 bent by the active bending section 310 and the bent active bending section 310 is located on the far side of the expansion section 110, the bent active bending section 310 is controlled to move relative to the tube section of the sheath 100 bent by the active bending section 310 so that a part of the bent active bending section 310 enters the expansion section 110, so that the minimum value of each maximum distance is greater than the size of the target object by utilizing the expansion section 110, thereby introducing the target object stuck between the tube section of the sheath 100 bent by the active bending section 310 and the bent active bending section 310 into the expansion section 110, so as to solve the problem of the target object being stuck between the bent sheath 100 and the bent active bending section 310.

[0068] The above embodiments of the present application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims

1. A negative pressure suction sheath, characterized in that: The distal end of the negative pressure suction sheath is provided with a sheath tube (100) that can be sleeved on the outside of the active bending section (310) of the endoscope, a portion of the tube section of the sheath tube (100) close to its own distal opening is radially expanded to form an expansion portion (110), the flow area of ​​the inner cavity of the expansion portion (110) is larger than the flow area of ​​the inner cavity of other parts of the sheath tube (100), and the active bending section (310) can drive at least part of the tube section of the sheath tube (100) close to its own distal opening to bend; The maximum distances between the parts of the bent active bending section (310) in the direction of its own extension and the inner wall of the tube section of the sheath tube (100) bent by the active bending section (310) are continuously changing. The tube section of the sheath tube (100) close to its distal opening includes a passive bending section (120). The active bending section (310) can drive the passive bending section (120) to bend. The expansion section (110) is arranged on the passive bending section (120) or the expansion section (110) is arranged on the proximal side of the passive bending section (120). The expansion section (110) can make the minimum value of each of the maximum distances larger than the size of the target object in the object to be sucked.

2. The negative pressure suction sheath according to claim 1, characterized in that: The maximum distances between each portion of the bent active bending section (310) in its own extension direction and the inner wall of the bent passive bending section (120) are continuously changing; The passive bending section (120) comprises a first tube section and a second tube section, the first tube section and the second tube section are of equal length, the second tube section is located proximal to the first tube section, and the expansion portion (110) is provided on the first tube section.

3. The negative pressure suction sheath according to claim 1, characterized in that: The tube section of the sheath tube (100) close to its distal opening includes an expansion section, the passive bending section (120) is located on the distal side of the expansion section, a partial area of ​​the expansion section is radially expanded to form the expansion portion (110), and the bent active bending section (310) can move relative to the bent passive bending section (120) so that a part of the bent active bending section (310) can enter the expansion portion (110), so that the minimum value of each maximum distance is greater than the size of the target object.

4. The negative pressure suction sheath according to claim 3, characterized in that: The stiffness of the expansion section is greater than the stiffness of the passive bending section (120); and / or the stiffness of the tube section of the sheath tube (100) located proximal to the expansion section is greater than the stiffness of the passive bending section (120).

5. The negative pressure suction sheath according to claim 3 or 4, characterized in that: The length of the passive bending section (120) is smaller than the length of the expansion portion (110) along the axial direction of the sheath tube (100).

6. The negative pressure suction sheath according to claim 3 or 4, characterized in that: The expansion portion (110) is annular, and the proximal edge and the distal edge of the expansion portion (110) are both capable of supporting the active bending section (310) after bending. The inner cavity of the expansion portion (110) comprises a accommodating space and an escape space which are sequentially distributed from the inside to the outside. The accommodating space is capable of accommodating the active bending section (310) after bending, and the inner wall surface of the expansion portion (110) can be separated from the active bending section (310) after bending by the escape space; or, The expansion portion (110) is annular, and the inner wall surface of the expansion portion (110) is an outwardly convex arc surface, and the curvature of the inner wall surface of the expansion portion (110) is the same as the maximum bending curvature of the active bending section (310).

7. The negative pressure suction sheath according to any one of claims 1 to 4, characterized in that: A first guide surface (112) is provided at the distal end of the expansion portion (110), and along the direction in which the sheath tube (100) extends from the distal end to the proximal end, the distance between the first guide surface (112) and the axis of the sheath tube (100) gradually increases; and / or, A second guide surface (113) is provided at the proximal end of the expansion portion (110), and along the direction extending from the distal end to the proximal end of the sheath tube (100), the distance between the second guide surface (113) and the axis of the sheath tube (100) gradually decreases.

8. An endoscope assembly, characterized in that: It comprises an endoscope and a negative pressure suction sheath as claimed in any one of claims 1 to 7, wherein the sheath tube (100) can be sleeved outside the insertion portion (300) of the endoscope, and the insertion portion (300) comprises the active bending section (310).

Images