Introducing sheath, endoscope assembly and method of using the same

Abstract

The present application belongs to the field of medical device technology, and specifically relates to a guide sheath, an endoscope assembly, and a method of using the same. The guide sheath includes a sheath tube and a restraint. The sheath tube is disposed at the distal end of the guide sheath. The distal end of the sheath tube is provided with a passive bending section, which can bend following the active bending section of the endoscope. The restraint is disposed inside the sheath tube or outside the sheath tube. The distal end of the restraint is disposed corresponding to the passive bending section, and the distal end of the restraint is separated from the distal end surface of the sheath tube in the axial direction of the sheath tube, so that the restraint can limit the proximal bending of the active bending section. The restraint can move relative to the sheath tube in a direction close to the proximal end of the sheath tube. The use of the guide sheath of the present application helps to solve the problem that the bending amplitude of the sheath tube driven by the insertion part is limited, so that the sheath tube cannot reach an ideal bending angle.

Description

Technical Field

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

[0002] Guide sheaths are commonly 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 the guide sheath to remove kidney stones, the guide sheath can be placed into the kidney using a guide wire, and then the insertion part of the endoscope can be inserted into the sheath to observe and break the stones. When the stones are on the side of the sheath, the insertion part can be used to drive the distal end of the sheath to bend, so that the distal end opening of the sheath is facing the stone and the stone is sucked into the gap between the insertion part and the sheath, thereby expelling the stone. In practice, since the sheath itself has a certain rigidity, the bending range of the sheath driven by the insertion part is limited, and it cannot make the sheath reach an ideal bending angle. Summary of the invention

[0004] The purpose of the present application is to provide a guide sheath, an endoscope assembly and a method of using the same, which can help solve the problem that the bending range of the sheath tube driven by the insertion portion is limited, so that the sheath tube cannot reach an ideal bending angle.

[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 guide sheath, comprising a sheath tube and a restraint, wherein the sheath tube is disposed at the distal end of the guide sheath, the distal end of the sheath tube is provided with a passive bending section, the passive bending section can bend following the active bending section of the endoscope, and the restraint is disposed inside the sheath tube or outside the sheath tube;

[0007] The distal end of the restraint is arranged corresponding to the passive bending section, and the distal end of the restraint is spaced apart from the distal end surface of the sheath in the axial direction of the sheath, so that the restraint can limit the proximal bending of the active bending section;

[0008] The restraining member is movable relative to the sheath along a direction approaching the proximal end of the sheath.

[0009] In some embodiments, the minimum distance between the restraint and the distal end surface of the sheath in the axial direction of the sheath is a first distance, and the first distance is one fifth to one half of the length of the passive bending segment; and / or,

[0010] The proximal end surface of the restraint member is arranged corresponding to the proximal opening of the passive bending section, or the proximal end surface of the restraint member is located at the proximal side of the passive bending section.

[0011] In some embodiments, the restraint is disposed inside the sheath, and the restraint is separated from the inner wall of the sheath; and / or,

[0012] The restraining member is a tubular structural member; and / or,

[0013] The restraining member can rotate relative to the sheath tube, and the rotation axis of the restraining member is parallel to or coaxial with the axis of the sheath tube.

[0014] In some embodiments, the guide sheath further comprises an operating handle and a driving mechanism, wherein the driving mechanism is disposed on the operating handle and connected to the restraining member, and the driving mechanism can drive the restraining member to move in a direction close to the proximal end of the sheath tube.

[0015] In some embodiments, the restraint member can rotate relative to the sheath, and the rotation axis of the restraint member is parallel to or coaxial with the axis of the sheath, and the driving mechanism can drive the restraint member to move and rotate simultaneously.

[0016] In some embodiments, the proximal end of the restraining member extends into the operating handle, the driving mechanism includes a lever and a guide slot, the guide slot is provided on the operating handle and extends toward the proximal end of the operating handle, one end of the lever passes through the guide slot and is connected to the restraining member;

[0017] When the lever slides relative to the guide groove, the guide groove can exert a force perpendicular to the axis of the sheath tube on the lever, so that the restraining member moves and rotates simultaneously.

[0018] In some embodiments, the guide groove includes a first groove section and a second groove section that are connected, the first end of the first groove section is connected to the first end of the second groove section, and the connection between the two is a first connection, and the second end of the first groove section and the second end of the second groove section are located on the same side of the first connection.

[0019] In a second aspect, the present application provides an endoscope assembly, including an endoscope and a guide sheath as described in any of the above embodiments, wherein the insertion portion of the endoscope can be inserted into the sheath tube.

[0020] 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:

[0021] Inserting the insertion part into the sheath tube so that the active bending section of the insertion part is located within the passive bending section;

[0022] Control the bending of the active bending section;

[0023] The restraining element is controlled to move relative to the sheath tube in a direction close to the proximal end of the sheath tube, so that the distal end opening of the sheath tube faces the target object.

[0024] In some embodiments, the step of controlling the restraining member to move relative to the sheath in a direction close to the proximal end of the sheath is specifically:

[0025] The restraining member is controlled to move relative to the sheath tube in a direction close to the proximal end of the sheath tube, and at the same time, the restraining member is controlled to rotate.

[0026] The beneficial technical effects of this application are as follows:

[0027] In the present application, the restraint is arranged inside or outside the sheath, the distal end of the restraint corresponds to the passive bending section, and the distal end of the restraint is separated from the distal end surface of the sheath in the axial direction of the sheath, so that the restraint can limit the bending of the proximal end of the active bending section, that is, when the active bending section bends, its distal end will bend first, thereby driving the bending of the distal end of the passive bending section, and in this process, the proximal end of the active bending section and the proximal end of the passive bending section will not bend. After the distal end of the active bending section drives the distal end of the passive bending section to bend, the restraint can be controlled to move in the direction close to the proximal end of the sheath, so that the restraint no longer restrains the proximal end of the active bending section, thereby driving the proximal end of the passive bending section to bend.

[0028] From the above analysis, it can be known that when the guide sheath of the present application is used in conjunction with an endoscope, the distal end of the active bending section can be bent first, and the proximal end can be bent later. The distal end of the active bending section bends first, which will form an initial torque at the distal end of the active bending section. The initial torque will be transmitted to the proximal end, trying to make the proximal end of the active bending section also bend, but the constraint will limit the bending of the proximal end of the active bending section. When the proximal end of the passive bending section does not bend, it will not apply a reverse torque to the distal end of the passive bending section. Therefore, compared with the prior art, the bending amplitude of the distal end of the passive bending section of the present application driven by the active bending section will be larger. And after the constraint moves to no longer constrain the proximal end of the active bending section, the proximal end of the passive bending section will bend under the action of the torque of the distal end of the passive bending section, thereby further increasing the bending amplitude of the sheath as a whole, so that the bending angle of the sheath meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the guide sheath disclosed in the first embodiment of the present application;

[0030] Figure 2 A cross-sectional view of the guide sheath disclosed in the first embodiment of the present application;

[0031] Figure 3 For this application Figure 2 The enlarged schematic diagram of point A in the middle;

[0032] Figure 4 This is a schematic diagram of the cooperation between the guide sheath and the endoscope disclosed in the first embodiment of the present application;

[0033] Figure 5 For this application Figure 4 The enlarged schematic diagram of point B in the middle;

[0034] Figure 6 This is a schematic structural diagram of the guide sheath disclosed in the second embodiment of the present application;

[0035] Figure 7 A cross-sectional view of the guide sheath disclosed in the second embodiment of the present application;

[0036] Figure 8 A schematic diagram of a guide groove disclosed in an embodiment of the present application;

[0037] Fig. 9 A schematic diagram of a guide groove disclosed in another embodiment of the present application;

[0038] Fig.10 A schematic diagram of a guide groove disclosed in yet another embodiment of the present application;

[0039] Fig.11 This is a schematic structural diagram of a socket member disclosed in the second embodiment of the present application;

[0040] Fig.12 It is a structural schematic diagram of the lever disclosed in the second embodiment of the present application;

[0041] Fig.13 This is a schematic diagram of the bending process of the insertion portion disclosed in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 100, sheath; 110, passive bending section; 200, restraining member; 300, operating handle; 400, driving mechanism; 410, lever; 411, matching portion; 420, guide groove; 421, first groove section; 422, second groove section; 423, first joint; 430, knob; 440, socket; 450, worm gear; 460, worm; 500, insertion portion. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] The guide 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 conjunction with the accompanying drawings.

[0047] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of the introducer sheath and its components relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0048] In the actual clinical application of endoscopes in combination with ureteral sheaths, the bending angle of the endoscope is relatively large, usually exceeding 180 degrees, so as to obtain a good field of view of the surgical area in the renal calyx; among them, when the ureteral sheath is used to attract stones, the distal end of the ureteral sheath is adapted to the area of ​​the active bending section of the endoscope, that is, the passive bending section of the sheath has a certain rigidity. Therefore, when the active bending section is controllably bent to the extreme position, the bending of the passive bending section driven by it cannot reach the ideal bending angle. The greater the rigidity of the passive bending section, the smaller the bending angle driven by the active bending section. In particular, as the angle of the sheath is bent, the greater the force required. Therefore, in clinical use, the bending angle of the sheath is often unsatisfactory.

[0049] To solve this problem, the related technology increases the maximum bending angle of the active bending section of the endoscope to overcome the above problem. However, as the bending angle increases, the part of the serpentine joint that is cut increases, resulting in a decrease in the structural strength of the final serpentine joint, which reduces the service life of the endoscope, which is not worth the cost.

[0050] like Fig.13As shown, the inventors have found through long-term research that the bending curvatures of the active bending section of the endoscope are not consistent in each position area during the bending process. As the bending process occurs, the active bending section presents: the bending curvature decreases from large to small from the proximal end to the distal end, until the traction rope is about to move to the extreme position, the curvature of the distal end of the active bending section will gradually increase until the curvature of the entire active bending section is basically consistent, that is, when the active bending section is controlled to bend, the proximal end of the active bending section will bend first, and during this process the distal end of the active bending section will maintain a relatively straight state, and as the bending process proceeds, the bending curvature of the proximal end of the active bending section gradually reaches a maximum, and then its distal end gradually bends and reaches a maximum bending curvature.

[0051] Therefore, when the active bending section drives the sheath to bend, the bending process of the sheath is basically the same as that of the active bending section. When the proximal end of the active bending section begins to bend, it will apply an initial bending moment to the passive bending section of the sheath. As the bending of the proximal end of the passive bending section of the sheath increases, this moment will gradually be transmitted to the distal end of the passive bending section of the sheath. Since the distal end of the passive bending section is the last part to bend, it will remain relatively straight at the beginning until the proximal end of the passive bending section bends to a certain extent before it begins to bend. Since the passive bending section itself has a certain rigidity, the initial bending of the proximal end of the passive bending section will limit the bending ability of the distal end of the passive bending section to a certain extent, because it will form a reverse moment on the distal end of the passive bending section, and this moment needs to be overcome to achieve the bending of the distal end of the passive bending section, which ultimately causes the bending angle of the sheath to fail to meet the design requirements.

[0052] like Figures 1 to 12 As shown, the embodiment of the present application discloses a guide sheath, including a sheath tube 100 and a restraint 200. The sheath tube 100 is disposed at the distal end of the guide sheath, and a passive bending section 110 is disposed at the distal end of the sheath tube 100. The passive bending section 110 can be bent following the active bending section of the endoscope, and the restraint 200 is disposed inside the sheath tube 100 or outside the sheath tube 100. Specifically, the restraint 200 being located inside the sheath tube 100 should be understood as: the restraint 200 can be located in the space formed inside the sheath tube 100, or the restraint 200 can also be embedded in the solid part of the sheath tube 100.

[0053] The distal end of the restraint 200 is arranged corresponding to the passive bending section 110, that is, the distal end of the restraint 200 and the passive bending section 110 are arranged opposite to each other in the radial direction of the sheath 100, and the distal end of the restraint 200 and the distal end surface of the sheath 100 are separated in the axial direction of the sheath 100, that is, the distal end of the restraint 200 and the distal end surface of the sheath 100 have a preset distance in the axial direction of the sheath 100, so that the restraint 200 can limit the proximal bending of the active bending section, and the restraint 200 can move relative to the sheath 100 in a direction close to the proximal end of the sheath 100.

[0054] Optionally, the proximal surface of the restraint 200 is arranged corresponding to the proximal opening of the passive bending section 110, or the proximal surface of the restraint 200 is located on the proximal side of the passive bending section 110. In this way, the restraint 200 can limit the bending of all parts of the active bending section close to its own proximal end. Of course, the proximal end of the restraint 200 can also be arranged opposite to the passive bending section 110 in the radial direction of the sheath tube 100, and the proximal surface of the restraint 200 and the proximal opening of the passive bending section 110 are separated in the axial direction of the sheath tube 100.

[0055] Optionally, the rigidity of the portion of the restraint 200 corresponding to the passive bending section 110 may be greater than the rigidity of the sheath 100 , so that the restraint 200 has a better effect in limiting the bending of all portions of the active bending section close to its own proximal end.

[0056] In the present application, the restraint 200 is arranged inside or outside the sheath 100, and the distal end of the restraint 200 is arranged corresponding to the passive bending section 110, and the distal end of the restraint 200 and the distal end surface of the sheath 100 are separated in the axial direction of the sheath 100, so that the restraint 200 can limit the bending of the proximal end of the active bending section, that is, when the active bending section bends, its distal end will bend first, thereby driving the bending of the distal end of the passive bending section 110, and in this process, the proximal end of the active bending section and the proximal end of the passive bending section 110 will not bend. After the distal end of the active bending section drives the distal end of the passive bending section 110 to bend, the restraint 200 can be controlled to move in the direction close to the proximal end of the sheath 100, so that the restraint 200 no longer restrains the proximal end of the active bending section, thereby driving the proximal end of the passive bending section 110 to bend. It should be noted that before the control restraint 200 moves, the traction rope controlling the bending of the active bending section can be placed in the most taut state to maximize the bending amplitude of the distal end of the active bending section, thereby better driving the bending of the distal end of the passive bending section 110.

[0057] From the above analysis, it can be known that when the guide sheath of the present application is used in conjunction with an endoscope, the distal end of the active bending section can be bent first, and the proximal end can be bent later. The distal end of the active bending section bends first, which will form an initial torque at the distal end of the active bending section. The initial torque will be transmitted to the proximal end, trying to make the proximal end of the active bending section also bend, but the constraint 200 will limit the bending of the proximal end of the active bending section. When the proximal end of the passive bending section 110 does not bend, it will not apply a reverse torque to the distal end of the passive bending section 110. Therefore, compared with the prior art, the bending amplitude of the distal end of the passive bending section 110 of the present application driven by the active bending section will be larger. And after the constraint 200 moves to no longer constrain the proximal end of the active bending section, the proximal end of the passive bending section 110 will bend under the action of the torque of the distal end of the passive bending section 110, thereby further increasing the overall bending amplitude of the sheath tube 100, so that the bending angle of the sheath tube 100 meets the design requirements. It should be noted that after the restraining member 200 moves to the maximum stroke in the direction close to the proximal end of the sheath tube 100 , the restraining member 200 is located at the proximal side of the passive bending section 110 .

[0058] Optionally, the restraint 200 may be plate-shaped, and the passive bending section 110 has an accommodating space for accommodating the active bending section. The restraint 200 is located on one side of the accommodating space. After the active bending section is inserted into the passive bending section 110 of the sheath 100, the restraint 200 is located on one side of the active bending section. At this time, the restraint 200 can limit the proximal end of the active bending section from bending toward the side where the restraint 200 is located, so that the bending angle of the sheath 100 toward the side where the restraint 200 is located meets the design requirements.

[0059] Further, in the case where the restraint 200 is in the form of a plate, the number of restraints 200 can be two, the two restraints 200 are arranged at intervals, and the above-mentioned accommodation space is formed between the two restraints 200. In this case, the restraint 200 can limit the proximal end of the active bending section to bend toward the side where the two restraints 200 are located, so that the bending angle of the sheath tube 100 bending toward the side where the two restraints 200 are located meets the design requirements. Of course, the number of restraints 200 can also be three or four, which can make the guide sheath of this embodiment adapt to a three-way bending or four-way bending endoscope, so that the bending angle of the sheath tube 100 bending toward three or four directions meets the design requirements.

[0060] In an optional embodiment, the restraint 200 is a tubular structure, which can be a round tube or a square tube, and the present application does not limit the shape of the restraint 200. In this embodiment, the restraint 200 is a tubular structure, which is sleeved with the sheath tube 100. At this time, the restraint 200 is a closed structure in its own circumferential direction, so that the guide sheath can adapt to a three-way or four-way curved endoscope, so that the bending angle of the sheath tube 100 in three or four directions meets the design requirements.

[0061] In an optional embodiment, the minimum distance between the restraining member 200 and the distal end surface of the sheath tube 100 in the axial direction of the sheath tube 100 is a first distance ( Figure 3 ), the first distance is one-fifth to one-half of the length of the passive bending segment 110. In this embodiment, the distal end of the restraint 200 is located in the middle front of the passive bending segment 110, so that the length of the portion of the active bending segment close to its proximal end that can be restricted by the restraint 200 is longer, thereby further increasing the bending angle of the distal end of the passive bending segment 110. Of course, the first distance can also be greater than one-half of the length of the passive bending segment 110, as long as the restraint 200 can limit the proximal bending of the active bending segment.

[0062] Generally speaking, there is a gap between the insertion portion 500 and the sheath 100 of the endoscope. During the bending process, the active bending section of the insertion portion 500 will first enter the above-mentioned gap, and then contact the inner wall of the sheath 100 to drive the sheath 100 to bend. Moreover, since the active bending section is covered with a flexible skin, if the restraint 200 is arranged outside the sheath 100, or the restraint 200 is arranged inside the sheath 100 and is arranged in close contact with the inner wall of the sheath 100, the proximal end of the active bending section will first bend in the gap between the restraint 200 and the active bending section before it contacts the restraint 200 to be restrained. When bending, the proximal end of the active bending section will drive the flexible skin to bend, thereby tensioning the flexible skin. This will apply a reverse torque to the distal end of the active bending section, thereby limiting the bending ability of the distal end of the active bending section. Obviously, this will affect the angle at which the distal end of the active bending section drives the distal end of the sheath 100 to bend.

[0063] Therefore, in an optional embodiment, the restraint 200 is disposed inside the sheath 100, and the restraint 200 is separated from the inner wall of the sheath 100, so that the restraint 200 can be closer to the accommodating space inside the sheath 100 for accommodating the active bending segment. After the active bending segment is inserted into the sheath 100, the restraint 200 is closer to the active bending segment, so that the size of the gap between the restraint 200 and the active bending segment can be reduced, so as to reduce the angle at which the proximal end of the active bending segment bends before the restraint 200 constrains the active bending segment to bend, thereby reducing the degree to which the skin at the proximal end of the active bending segment is tensioned, so as to reduce the magnitude of the reverse torque applied to the distal end of the active bending segment, so as to enhance the bending ability of the active bending segment to drive the distal end of the sheath 100.

[0064] If the restraint 200 and the sheath 100 are matched at the circumferential upper limit, that is, the restraint 200 cannot rotate relative to the sheath 100, when controlling the restraint 200 to move relative to the sheath 100 in the direction close to the proximal end of the sheath 100, it is necessary to overcome the static friction between the restraint 200 and the sheath 100 or between the restraint 200 and the insertion portion 500, and the static friction is large. Therefore, it is not easy to drive the restraint 200 to move when a force is directly applied to the restraint 200 in the direction extending from the distal end to the proximal end of the sheath 100.

[0065] Therefore, in an optional embodiment, the restraint 200 can rotate relative to the sheath 100, and the rotation axis of the restraint 200 is parallel or coaxial with the axis of the sheath 100. In this embodiment, the restraint 200 can rotate relative to the sheath 100, and the restraint 200 is driven to rotate while applying a force in a direction extending from the distal end to the proximal end of the sheath 100 to the restraint 200, so that the static friction between the restraint 200 and the sheath 100 or between the restraint 200 and the insertion portion 500 can be converted into dynamic friction, and the dynamic friction is smaller than the static friction, so it is easier to drive the restraint 200 to move.

[0066] In some embodiments, the restraint 200 can be disposed outside the sheath 100, and the proximal end of the restraint 200 can be extended to the proximal end of the sheath 100. At this time, the proximal end of the restraint 200 can be held and pulled to drive the restraint 200 to move and rotate in a direction close to the proximal end of the sheath 100.

[0067] In an optional embodiment, the guide sheath further includes an operating handle 300 and a driving mechanism 400 . The driving mechanism 400 is disposed on the operating handle 300 and connected to the restraining member 200 . The driving mechanism 400 can drive the restraining member 200 to move in a direction close to the proximal end of the sheath tube 100 .

[0068] In this embodiment, the driving mechanism 400 of the guide sheath is connected to the restraining member 200, thereby driving the restraining member 200 to move, so that the restraining member 200 does not need to be driven to move by holding the restraining member 200. It should be noted that when this embodiment is combined with the embodiment of "the proximal surface of the restraining member 200 is arranged corresponding to the proximal opening of the passive bending section 110", the driving mechanism 400 can be indirectly connected to the restraining member 200 through a connecting member. When this embodiment is combined with the embodiment of "the proximal surface of the restraining member 200 is located on the proximal side of the passive bending section 110", the proximal end of the restraining member 200 can extend into the operating handle 300 and be directly connected to the driving mechanism 400.

[0069] In an optional embodiment, the restraint 200 can rotate relative to the sheath 100, and the rotation axis of the restraint 200 is parallel or coaxial with the axis of the sheath 100, and the driving mechanism 400 can simultaneously drive the restraint 200 to move and rotate. In this embodiment, the driving mechanism 400 can drive the restraint 200 to rotate while applying a force in a direction extending from the distal end to the proximal end of the sheath 100 to the restraint 200, so that the static friction between the restraint 200 and the sheath 100 or between the restraint 200 and the insertion portion 500 can be converted into dynamic friction, and the dynamic friction is smaller than the static friction, so it is easier to drive the restraint 200 to move.

[0070] In an alternative embodiment, see Figures 6 to 10 The proximal end of the restraint 200 extends into the operating handle 300. The driving mechanism 400 includes a lever 410 and a guide groove 420. The guide groove 420 is provided on the operating handle 300 and extends toward the proximal end of the operating handle 300. One end of the lever 410 passes through the guide groove 420 and is connected to the restraint 200. When the lever 410 slides relative to the guide groove 420, the guide groove 420 can apply a force perpendicular to the axis of the sheath 100 to the lever 410, so that the restraint 200 moves and rotates at the same time.

[0071] The specific operation process of using the driving mechanism 400 to move the restraining member 200 in the direction close to the proximal end of the sheath tube 100 is as follows: the lever 410 is moved to move the lever 410 in the direction close to the proximal end of the operating handle 300. During this process, the lever 410 will slide relative to the guide groove 420, and the guide groove 420 will apply a force perpendicular to the axis of the sheath tube 100 to the lever 410, so that the lever 410 moves in the circumferential direction of the operating handle 300 while moving in the direction close to the proximal end of the operating handle 300, thereby driving the restraining member 200 to rotate. It can be seen that this embodiment can drive the restraining member 200 to move and rotate simultaneously by using the guide groove 420 and the lever 410, which can simplify the structure of the driving mechanism 400.

[0072] Optionally, the guide groove 420 may be an arc groove (eg Fig. 9 As shown), S-shaped groove (as Figure 8 As shown), C-shaped groove, wave-shaped groove (as shown Fig.10 As shown), a sinusoidal groove, a spiral groove, an inclined straight groove, a zigzag groove, etc. The present application does not limit the shape of the guide groove 420.

[0073] In an optional embodiment, the driving mechanism 400 also includes a toggle knob 430, which is connected to one end of the lever 410 away from the restraining member 200, and the toggle knob 430 is located outside the operating handle 300. The toggle knob 430 and the operating handle 300 are engaged in an upper limit position in a direction extending from the toggle knob 430 to the lever 410.

[0074] In an alternative embodiment, see Fig.11 and Fig.12 The driving mechanism 400 further includes a sleeve 440, which can be fixedly sleeved on the outside of the constraint 200 by bonding, hot-melt welding, etc., and a plurality of first meshing teeth are provided on the sleeve 440. The end of the lever 410 connected to the constraint 200 is provided with a matching portion 411, a matching space is formed in the matching portion 411, one side of the matching space is provided with an opening, and a plurality of second meshing teeth are provided in the matching portion 411, the first meshing teeth and the second meshing teeth are meshed and connected, and the matching portion 411 and the sleeve 440 are matched at the axial upper limit position of the sheath 100, so that the lever 410 can drive the constraint 200 to rotate during the circumferential movement of the operating handle 300. Of course, the lever 410 and the constraint 200 can also be connected by threaded connection, clamping, bonding, hot-melt welding, etc.

[0075] In an alternative embodiment, see Figures 8 to 10 The guide groove 420 includes a first groove section 421 and a second groove section 422 that are connected to each other. The first end of the first groove section 421 is connected to the first end of the second groove section 422. That is, the first groove section 421 and the second groove section 422 are adjacent to each other, and the connection between the two is a first connection 423. The second end of the first groove section 421 and the second end of the second groove section 422 are located on the same side of the first connection 423.

[0076] In this embodiment, the guide groove 420 includes a first groove section 421 and a second groove section 422 that are connected. The second end of the first groove section 421 and the second end of the second groove section 422 are located on the same side of the first joint 423, that is, the first groove section 421 and the second groove section 422 are located on the same side of the first joint 423. Therefore, the direction in which the lever 410 rotates around the operating handle 300 when extending from the second end of the first groove section 421 to the first joint 423 is opposite to the direction in which the lever 410 rotates around the operating handle 300 when extending from the first joint 423 to the second end of the second groove section 422. Therefore, in the process of the lever 410 sliding from the second end of the first groove section 421 to the second end of the second groove section 422, the lever 410 will rotate in two opposite directions in turn, thereby driving the constraint 200 to rotate in two opposite directions in turn, which makes it easier to move the constraint 200.

[0077] In some other embodiments, see Figure 1 , Figure 2 and Figure 4 The restraining member 200 and the operating handle 300 are slidably matched in the axial direction of the sheath 100. The driving mechanism 400 may also include a worm wheel 450 and a worm 460. The worm wheel 450 is rotatably provided on the operating handle 300, and the worm 460 is fixedly connected to the proximal end of the restraining member 200. By rotating the worm wheel 450, the worm 460 can be driven to move in a direction close to the proximal end of the operating handle 300, and the worm 460 will rotate around its own axis during the movement.

[0078] The embodiment of the present application also discloses an endoscope assembly, including an endoscope and a guide sheath as described in any of the above embodiments, and the insertion portion 500 of the endoscope can be inserted into the sheath tube 100. Since the endoscope assembly includes the guide sheath as described in any of the above embodiments, the endoscope assembly has the beneficial effects of the guide sheath, which will not be described in detail here.

[0079] The endoscope referred to in the embodiments of the present application may 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 embodiments of the present application do not impose any specific restrictions on the type of endoscope.

[0080] The present application also discloses a method for using an endoscope assembly, which is applied to the above-mentioned endoscope assembly, including:

[0081] S100, insert the insertion part 500 into the sheath tube 100, so that the active bending section of the insertion part 500 is located within the passive bending section 110. Specifically, the position of the insertion part 500 can be obtained by a camera module at the distal end of the insertion part 500, so that the insertion part 500 is located at a preset position.

[0082] S200, controlling the active bending section to bend. Specifically, the active bending section can be controlled to bend by pulling a traction rope of the endoscope.

[0083] S300, control the restraint 200 to move relative to the sheath tube 100 in a direction close to the proximal end of the sheath tube 100, so that the distal opening of the sheath tube 100 faces the target object. Specifically, during the movement of the restraint 200 in a direction close to the proximal end of the sheath tube 100, the proximal part of the active bending section and the proximal part of the sheath tube 100 are gradually released, so that the active bending section drives the proximal part of the sheath tube 100 to bend, thereby making the distal opening of the sheath tube 100 face the target object. After the sheath tube 100 faces the target object, the target object can be discharged from the gap between the sheath tube 100 and the active bending section through the negative pressure nozzle of the guide sheath.

[0084] It should be noted that, after the restraint 200 is controlled to move relative to the sheath 100 in a direction close to the proximal end of the sheath 100 , the distal end of the restraint 200 can still be located in the passive bending section 110 , or the distal end of the restraint 200 can be located on the proximal side of the passive bending section 110 .

[0085] When the guide sheath of the present application is used in conjunction with an endoscope, the distal end of the active bending section can be bent first, and the proximal end can be bent later. The distal end of the active bending section bends first, which will form an initial torque at the distal end of the active bending section. The initial torque will be transmitted to the proximal end, trying to make the proximal end of the active bending section also bend, but the restraint 200 will limit the bending of the proximal end of the active bending section. When the proximal end of the passive bending section 110 does not bend, it will not apply a reverse torque to the distal end of the passive bending section 110. Therefore, compared with the prior art, the bending amplitude of the distal end of the passive bending section 110 driven by the active bending section will be greater.

[0086] In an optional embodiment, in step S300, the step of controlling the restraining member 200 to move relative to the sheath tube 100 in a direction close to the proximal end of the sheath tube 100 is specifically as follows:

[0087] The restraint 200 is controlled to move relative to the sheath 100 in a direction close to the proximal end of the sheath 100 while being controlled to rotate. In this way, the static friction between the restraint 200 and the sheath 100 or between the restraint 200 and the insertion portion 500 can be converted into dynamic friction. The dynamic friction is smaller than the static friction, so it is easier to drive the restraint 200 to move.

[0088] 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 guide sheath, characterized in that: The invention comprises a sheath tube (100) and a restraining member (200), wherein the sheath tube (100) is arranged at the distal end of the guide sheath, and a passive bending section (110) is arranged at the distal end of the sheath tube (100), and the passive bending section (110) can bend following the active bending section of the endoscope, and the restraining member (200) is arranged inside the sheath tube (100) or outside the sheath tube (100); the distal end of the restraining member (200) is arranged corresponding to the passive bending section (110), and the distal end of the restraining member (200) and the distal end surface of the sheath tube (100) are spaced apart in the axial direction of the sheath tube (100), so that the restraining member (200) can limit the proximal bending of the active bending section; The guide sheath also includes an operating handle (300) and a driving mechanism (400), wherein the driving mechanism (400) is disposed on the operating handle (300) and is connected to the restraining member (200), and the driving mechanism (400) is capable of driving the restraining member (200) to rotate while moving relative to the sheath tube (100) in a direction close to the proximal end of the sheath tube (100); the rotation axis of the restraining member (200) is parallel to or coaxial with the axis of the sheath tube (100).

2. The guide sheath according to claim 1, characterized in that: The minimum distance between the restraining member (200) and the distal end surface of the sheath tube (100) in the axial direction of the sheath tube (100) is a first distance, and the first distance is one fifth to one half of the length of the passive bending section (110).

3. The guide sheath according to claim 1, characterized in that: The restraining member (200) is disposed inside the sheath tube (100), and the restraining member (200) is separated from the inner wall of the sheath tube (100); and / or the restraining member (200) is a tubular structural member.

4. The guide sheath according to any one of claims 1 to 3, characterized in that: The proximal end of the restraining member (200) extends into the operating handle (300), and the driving mechanism (400) comprises a lever (410) and a guide groove (420), wherein the guide groove (420) is provided on the operating handle (300) and extends in a direction close to the proximal end of the operating handle (300), and one end of the lever (410) passes through the guide groove (420) and is connected to the restraining member (200); when the lever (410) slides relative to the guide groove (420), the guide groove (420) can apply a force perpendicular to the axis of the sheath tube (100) to the lever (410), so that the restraining member (200) moves and rotates simultaneously.

5. The guide sheath according to claim 4, characterized in that: The guide groove (420) comprises a first groove section (421) and a second groove section (422) which are connected to each other; a first end of the first groove section (421) is connected to a first end of the second groove section (422), and a connection point between the two is a first connection point (423); and a second end of the first groove section (421) and a second end of the second groove section (422) are located on the same side of the first connection point (423).

6. An endoscope assembly, characterized in that: It comprises an endoscope and a guide sheath according to any one of claims 1 to 5, wherein an insertion portion (500) of the endoscope can be inserted into the sheath tube (100).

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