Introducer sheath and sheath tube assembly

Abstract

The present application belongs to the field of medical device technology, and specifically relates to a guide sheath and a sheath tube assembly thereof. The sheath tube assembly includes a sheath tube, and the sheath tube has a positioning space for accommodating at least part of the insertion part of the endoscope, the axis of the positioning space is located on the first side of the axis of the sheath tube, and the other side of the axis of the sheath tube is the second side opposite to the first side; the sheath tube is provided with a force-applying structure, and the force-applying structure can apply a force in a first direction to the part of the insertion part located in the positioning space, wherein the first direction is a direction extending from the second side to the first side. In this embodiment, a force-applying structure is provided on the sheath tube, and the force-applying structure can apply a force in a first direction to the insertion part, so that the insertion part remains in the positioning space, and prevents the insertion part from moving in the opposite direction of the first direction to occupy part of the flow space located on one side of the positioning space, thereby ensuring that the insertion part is biased in the sheath tube, and a larger size is reserved for the flow space to prevent blockage.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and specifically relates to a guide sheath and a sheath tube assembly thereof. 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 a guide sheath to remove kidney stones, the guide sheath can be placed into the kidney using a guide wire, and then the insertion portion of the endoscope is inserted into the sheath to observe and break the stones. After the stones are broken, the sheath can be used to suck the stones into the gap between the sheath and the insertion portion, thereby expelling the stones. However, in practice, when using the sheath to suck stones in the human body, the problem of unsmooth stone expulsion is prone to occur. Summary of the invention

[0004] The purpose of the present application is to provide a guide sheath and a sheath tube assembly thereof, which can reduce the problem of sticking that is easy to occur when using the sheath tube to aspirate stones in the human body 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 sheath tube assembly of a guide sheath, comprising a sheath tube, wherein the sheath tube has a positioning space for accommodating at least a portion of an insertion portion of an endoscope, wherein the axis of the positioning space is located on a first side of the axis of the sheath tube, and the other side of the axis of the sheath tube is a second side opposite to the first side;

[0007] The sheath tube is provided with a force-applying structure, which can apply a force in a first direction to a portion of the insertion portion located in the positioning space, wherein the first direction is a direction extending from the second side to the first side.

[0008] In a second aspect, the present application provides a guide sheath comprising the above-mentioned sheath tube assembly.

[0009] The beneficial technical effects of this application are as follows:

[0010] In this embodiment, there is a positioning space in the sheath tube, and the axis of the positioning space is located on the first side of the axis of the sheath tube, that is, the positioning space is not in the middle of the sheath tube, which can make the space in the sheath tube on the side opposite to the first direction of the positioning space have a larger size, and this space is the flow space for the object to be sucked to pass through. It can be seen that after the insertion part is arranged in the positioning space, the flow space on the side of the insertion part can have a larger size, thereby achieving the purpose of preventing blockage. In addition, in this embodiment, a force-applying structure is provided on the sheath tube, and the force-applying structure can apply a force in the first direction to the insertion part, so that the insertion part remains in the positioning space, and prevents the insertion part from moving in the opposite direction of the first direction to occupy part of the flow space on the side of the positioning space, thereby ensuring that the insertion part is biased in the sheath tube, reserving a larger size for the flow space, and preventing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the sheath tube assembly when the anti-blocking portion disclosed in the embodiment of the present application is in a contracted state;

[0012] Figure 2 It is a schematic diagram of the structure of the sheath tube assembly after the skin is hidden when the anti-blocking part disclosed in the embodiment of the present application is in a retracted state;

[0013] Figure 3 A cross-sectional view of the sheath tube assembly after the skin is hidden when the anti-blocking portion disclosed in the embodiment of the present application is in a retracted state;

[0014] Figure 4 For this application Figure 3 The enlarged schematic diagram of point A in the middle;

[0015] Figure 5 A cross-sectional view of a first pipe section disclosed in an embodiment of the present application;

[0016] Figure 6 For this application Figure 5 The enlarged schematic diagram of point B in the middle;

[0017] Figure 7 This is a structural diagram of the anti-blocking part disclosed in the embodiment of the present application;

[0018] Figure 8 A cross-sectional view of the sheath tube assembly after the skin is hidden when the anti-blocking portion disclosed in the embodiment of the present application is in an expanded state;

[0019] Fig. 9 For this application Figure 8 The enlarged schematic diagram of the center C;

[0020] Fig.10 A front view of the first pipe section disclosed in the embodiment of the present application;

[0021] Fig.11 A schematic diagram of the cooperation between the first pipe segment and the passive bending segment disclosed in the embodiment of the present application;

[0022] Fig.12 It is a schematic diagram of a partial structure of a sheath tube assembly when the anti-blocking portion disclosed in an embodiment of the present application is in a contracted state;

[0023] Fig.13 This is a partial structural schematic diagram of a sheath tube assembly when the anti-blocking portion disclosed in another embodiment of the present application is in an expanded state;

[0024] Fig.14 For this application Fig.13 Enlarged schematic diagram of point D in the middle.

[0025] Description of reference numerals:

[0026] 10. Sheath; 100. First tube section; 110. Socket connection; 111. Deformation notch; 200. Second tube section; 210. Anti-blocking section; 211. Main body; 2111. Deformable body; 2112. Elastic bracket; 212. Mounting ring; 300. Retaining member; 400. Transmission rod; 500. Protrusion; 501. Abutment area; 510. First protrusion; 520. Second protrusion; 600. Skin; 700. Insertion section; 710. Active bending section; 720. Passive bending section. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] The guide sheath and sheath tube assembly 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.

[0030] 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".

[0031] The inventors found that when the sheath is used to aspirate stones, the larger the gap between the sheath and the insertion part, the better the stone passability, and the less likely it is to have problems with stone removal. When the axis of the insertion part is located on one side of the axis of the sheath, the size of the gap is larger, and when the axis of the insertion part is colinear with the axis of the sheath, the size of the gap is smaller. In practice, the position of the insertion part in the sheath is uncertain, and there is a part of the insertion part located in the middle of the sheath. At this time, this part of the insertion part is coaxial with the sheath, which obviously leads to a smaller gap, resulting in unsmooth stone removal.

[0032] like Figures 1 to 14 As shown, the embodiment of the present application discloses a sheath tube assembly of a guide sheath, including a sheath tube 10, wherein the sheath tube 10 has a positioning space for accommodating at least part of the insertion portion 700 of the endoscope, that is, after the insertion portion 700 is inserted into the sheath tube 10, at least part of the insertion portion 700 can be accommodated in the positioning space, and the axis of the positioning space is located on a first side of the axis of the sheath tube 10, and the other side of the axis of the sheath tube 10 is a second side opposite to the first side. The endoscope here 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 the endoscope.

[0033] The sheath tube 10 is provided with a force-applying structure, which can apply a force in a first direction to the portion of the insertion portion 700 located in the positioning space, wherein the first direction ( Fig.10 The direction indicated by the y arrow line is the direction extending from the second side to the first side.

[0034] In this embodiment, there is a positioning space in the sheath tube 10, and the axis of the positioning space is located on the first side of the axis of the sheath tube 10, that is, the positioning space is not in the middle of the sheath tube 10, which can make the space in the sheath tube 10 located on the side of the positioning space in the opposite direction of the first direction have a larger size, and this space is the flow space for the object to be sucked to pass through. It can be seen that after the insertion part 700 is arranged in the positioning space, the flow space on the side of the insertion part 700 can have a larger size, so as to achieve the purpose of anti-blocking. In addition, in this embodiment, a force-applying structure is provided on the sheath tube 10, and the force-applying structure can apply a force in the first direction to the insertion part 700, so that the insertion part 700 remains in the positioning space, preventing the insertion part 700 from moving in the opposite direction of the first direction to occupy part of the flow space on the side of the positioning space, thereby ensuring that the insertion part 700 is biased in the sheath tube 10, reserving a larger size for the flow space, and preventing blockage.

[0035] See also Figures 3 to 6 and Fig. 9 In an optional embodiment, the force-applying structure includes a protrusion 500 radially protruding from the inner wall of the sheath tube 10. The protrusion 500 here has a certain rigidity, so the protrusion 500 is not easily deformed during the bending of the sheath tube 10. The protrusion 500 is connected to the sheath tube 10, and the protrusion 500 radially extends to the positioning space so that the protrusion 500 contacts the insertion portion 700 located in the positioning space, and the insertion portion 700 cooperates with the protrusion 500 in the upper limit position in the opposite direction of the first direction.

[0036] The specific working process of this embodiment is as follows: insert the insertion part 700 into the sheath tube 10, and make at least part of the insertion part 700 located in the positioning space, at this time, the protrusion 500 contacts the part of the insertion part 700 located in the positioning space, and the part of the insertion part 700 cooperates with the protrusion 500 in the upper limit position in the opposite direction of the first direction. When the part of the insertion part 700 has a tendency to move in the opposite direction of the first direction, the protrusion 500 will stop and limit the part of the insertion part 700, and apply a reaction force in the first direction to the part of the insertion part 700 to limit the movement of the part of the insertion part 700 in the opposite direction of the first direction, so that the part of the insertion part 700 remains in the positioning space to prevent blockage. In addition, the protrusion 500 of this embodiment also has a certain rigidity, which can improve the stability of the protrusion 500 in stopping and limiting the part of the insertion part 700 located in the positioning space, so as to improve the anti-blocking effect.

[0037] See also Fig.10In an optional embodiment, the number of the protrusions 500 may be only one, or the protrusions 500 may include a first protrusion 510 and a second protrusion 520, and the first protrusion 510 and the second protrusion 520 are respectively located at the sheath tube 10 along the second direction ( Fig.10 The second direction is perpendicular to the first direction and the axial direction of the sheath tube 10. In this embodiment, the protrusion 500 includes a first protrusion 510 and a second protrusion 520, and the first protrusion 510 and the second protrusion 520 both extend to the positioning space, that is, the first protrusion 510 and the second protrusion 520 can both limit the insertion part 700, which can improve the limiting stability of the protrusion 500 on the insertion part 700.

[0038] See also Fig.11 In an optional embodiment, the first protrusion 510 and the second protrusion 520 both include an abutment area 501 that can contact the insertion portion 700. The structures of the first protrusion 510 and the second protrusion 520 here can be the same. The abutment area 501 of the first protrusion 510 and the abutment area 501 of the second protrusion 520 are both located on the side of the axis of the positioning space facing the second side. Along the second direction, the abutment area 501 of the first protrusion 510 and the abutment area 501 of the second protrusion 520 are staggered.

[0039] In this embodiment, the abutment between the abutment area 501 of the first convex portion 510 and the insertion portion 700 is the first abutment, and the abutment between the abutment area 501 of the second convex portion 520 and the insertion portion 700 is the second abutment. Since the abutment area 501 of the first convex portion 510 and the abutment area 501 of the second convex portion 520 are staggered in the second direction, the first abutment and the second abutment are also staggered in the second direction. Compared with the embodiment in which the first abutment and the second abutment are relatively arranged, this embodiment can increase the connection distance between the first abutment and the second abutment, thereby increasing the diameter of the insertion portion 700 that can be limited by the convex portion 500, so that the sheath tube assembly of this embodiment is adapted to the insertion portion 700 of a larger size. Of course, the abutment area 501 of the first convex portion 510 and the abutment area 501 of the second convex portion 520 can also be relatively arranged in the second direction, and there is no staggered part between the two at this time, and this application is not limited to this.

[0040] See also Figure 6In an optional embodiment, a part of the side wall of the sheath tube 10 is recessed inward to form a protrusion 500, for example, the protrusion 500 can be formed by stamping. This embodiment uses the sheath tube 10 itself to form the protrusion 500. Compared with the embodiment in which an additional protrusion structure is provided on the inner wall of the sheath tube 10 (for example, a hollow or solid pipe is welded on the inner wall of the sheath tube 10 to form the protrusion 500), this embodiment can simplify the structure of the sheath tube 10.

[0041] See also Figure 5 In some embodiments, the protrusion 500 includes a plurality of protrusion segments spaced apart along the direction extending from the distal end to the proximal end of the sheath tube 10, and there is a gap between two adjacent protrusion segments. In this case, the protrusion 500 has interrupted or discontinuous parts in the above-mentioned extending direction. When this embodiment is combined with an embodiment in which the protrusion 500 includes a first protrusion 510 and a second protrusion 520, both the first protrusion 510 and the second protrusion 520 include a plurality of protrusion segments.

[0042] And / or, in an optional embodiment, the raised portion 500 extends continuously from the distal end of the sheath tube 10 to the proximal end of the sheath tube 10 (not shown in the figure), that is, in the direction of extension from the distal end of the sheath tube 10 to the proximal end, the raised portion 500 does not have any interrupted or discontinuous parts. In this way, during the process of inserting the insertion portion 700 into the sheath tube 10, the raised portion 500 will always provide guidance for the insertion portion 700 to prevent the front end of the insertion portion 700 from entering between the above-mentioned two adjacent raised sections. After the insertion portion 700 enters between the above-mentioned two adjacent raised sections, it will be stopped by the raised section and restricted from continuing to insert. At this time, the insertion portion 700 needs to be retreated a certain distance and then continued to be inserted forward. This will increase the difficulty of inserting the insertion portion 700 into the sheath tube 10. Therefore, the structure of this embodiment can reduce the difficulty of inserting the insertion portion 700 into the sheath tube 10.

[0043] and / or, see Fig.10 In an optional embodiment, a through hole is provided on the protrusion 500, and the through hole penetrates the protrusion 500 along the axial direction of the sheath tube 10. In this embodiment, a through hole is provided inside the protrusion 500, so that the through hole, i.e., the internal space of the protrusion 500, can be used to arrange components, such as the transmission rod 400 described below, so that the layout of components in the sheath tube 10 can be optimized, and a larger layout space can be reserved for the components in the sheath tube 10.

[0044] See also Fig.11In an optional embodiment, along the first direction, the minimum distance between the axis of the positioning space and the inner wall of the sheath 10 is D1, the radius of the positioning space is R1, and D1=R1. In this embodiment, the positioning space is a circular space. Since D1=R1, after at least part of the insertion portion 700 is inserted into the positioning space, the part of the insertion portion 700 located in the positioning space will be tangent to the inner wall of the sheath 10, that is, after adopting the structure of this embodiment, the axis of the positioning space can be kept as far away from the axis of the sheath 10 as possible, so that the size of the flow space is larger, thereby reserving more space for stones waiting to be aspirated, so as to further prevent blockage. Of course, D1 can also be greater than R1, and this application is not limited to this.

[0045] In some embodiments, the tube section of the sheath tube 10 close to its own distal opening can bend following the active bending section 710 of the endoscope, and the first side and the second side are both adjacent sides of one side of the sheath tube 10 along its own bending direction.

[0046] In an optional embodiment, the tube section of the sheath tube 10 close to its own distal opening can bend following the active bending section 710 of the endoscope, and the first side and the second side are respectively located on opposite sides of the sheath tube 10 along its own bending direction, which is more conducive to the active bending section 710 to drive the tube section of the sheath tube 10 close to its own distal opening to bend.

[0047] In some embodiments, the sheath 10 includes a first tube segment 100 and a second tube segment 200, the first tube segment 100 is used to accommodate the passive bending segment 720, and the second tube segment 200 is used to accommodate the active bending segment 710. The first tube segment 100 and the second tube segment 200 are both provided with the above-mentioned force-applying structure, that is, the force-applying structure can apply a force in a first direction to the active bending segment 710 and the passive bending segment 720 respectively. However, since the distal end of the sheath 10 can bend following the active bending segment 710, that is, at least the tube segment of the second tube segment 200 close to its own distal opening can bend following the active bending segment 710, the width of the distal end of the second tube segment 200 will increase after bending, so the constraint of the active bending segment 710 by the force-applying structure will be weakened, which may cause the active bending segment 710 to move in the second tube segment 200, so that a part of the active bending segment 710 is located in the middle of the second tube segment 200, causing the gap between the active bending segment 710 and the sheath 10 to be too small, thereby causing blockage.

[0048] Taking the force-applying structure including the first protrusion 510 and the second protrusion 520 as an example, when the width of the second tube segment 200 increases, the distance between the first protrusion 510 and the second protrusion 520 will also increase, thereby weakening the constraint of the force-applying structure on the active bending segment 710 and increasing the risk of stones waiting to be sucked out blocking the second tube segment 200.

[0049] See also Figures 7 to 9In order to reduce the risk of stones waiting to be aspirated being blocked in the second tube segment 200, in an optional embodiment, the sheath 10 includes a first tube segment 100 and a second tube segment 200, the proximal end of the second tube segment 200 is connected to the distal end of the first tube segment 100, and at least the tube segment of the second tube segment 200 close to its own distal end opening can bend following the active bending segment 710 of the endoscope, that is, the distal end of the second tube segment 200 has a passive bending function, and the proximal end of the second tube segment 200 may or may not have a passive bending function, and the positioning space and the force-applying structure are both provided in the first tube segment 100, and the positioning space is used to accommodate at least part of the passive bending segment 720 of the insertion portion 700.

[0050] The second tube section 200 is provided with an anti-blocking portion 210, and the anti-blocking portion 210 is in an expanded state. When the anti-blocking portion 210 is in the expanded state, at least part of the anti-blocking portion 210 radially protrudes outward from other parts of the sheath tube 10, that is, along the direction extending from the inside of the anti-blocking portion 210 to the outside, at least part of the anti-blocking portion 210 protrudes outward from other parts of the sheath tube 10, and the flow area of ​​the first inner cavity of the anti-blocking portion 210 is greater than the flow area of ​​the second inner cavity of other parts of the sheath tube 10. Specifically, the other part of the sheath tube 10 refers to the part of the sheath tube 10 located outside the anti-blocking portion 210, and the other part of the sheath tube 10 can be a tube section of equal diameter; or the other part of the sheath tube 10 can also be a tube section of unequal diameter, in which case at least part of the anti-blocking portion 210 radially protrudes outward from the part where the diameter of the tube section of unequal diameter is the largest.

[0051] Optionally, when the anti-blocking portion 210 is in an expanded state, all areas of the anti-blocking portion 210 along its own circumference expand outward, and all parts of the anti-blocking portion 210 along its own circumference protrude radially outward from other parts of the sheath 10; or, when the anti-blocking portion 210 is in an expanded state, a partial area of ​​the anti-blocking portion 210 along its own circumference expands outward, a part of the anti-blocking portion 210 along its own circumference protrudes radially outward from other parts of the sheath 10, and another partial area of ​​the anti-blocking portion 210 along its own circumference may be flush with other parts of the sheath 10.

[0052] In this embodiment, when the sheath 10 is inserted into the human body and the stone to be sucked needs to be sucked, the anti-blocking portion 210 can be in an expanded state, and then the insertion portion 700 of the endoscope can be inserted into the sheath 10, and the active bending section 710 of the insertion section 700 drives at least part of the second tube segment 200 to bend, and a part of the active bending section 710 will be located in the middle of the second tube segment 200, and then the part of the active bending section 710 can be made to correspond to the anti-blocking portion 210, which can increase the gap size between the part of the active bending section 710 and the second tube segment 200, so that the stone to be sucked can smoothly pass through the gap between the bent active bending section 710 and the inner wall of the second tube segment 200 bent by the active bending section 710, thereby reducing the risk of blockage of the stone to be sucked in the second tube segment 200.

[0053] The embodiments in which the active bending section 710 located in the middle of the second pipe section 200 corresponds to the anti-blocking section 210 include the following two embodiments:

[0054] 1. After the insertion portion 700 of the endoscope is inserted into the sheath tube 10 and the active bending section 710 drives the sheath tube 10 to bend, the portion of the active bending section 710 located in the middle of the second tube segment 200 corresponds exactly to the anti-blocking portion 210, so that the stone waiting to be sucked can smoothly pass through the gap between the bent active bending section 710 and the inner wall of the second tube segment 200 bent by the active bending section 710, thereby reducing the risk of stone waiting to be sucked being blocked in the second tube segment 200.

[0055] 2. After the insertion portion 700 of the endoscope is inserted into the sheath tube 10 and the active bending section 710 drives the sheath tube 10 to bend, the portion of the active bending section 710 located in the middle of the second tube segment 200 does not correspond to the anti-blocking portion 210. For example, the anti-blocking portion 210 is located proximal to the portion of the active bending section 710. At this time, it is only necessary to pull the active bending section 710 to move the active bending section 710 toward the proximal end of the sheath tube 10 until a portion of the bent active bending section 710 enters the anti-blocking portion 210, thereby introducing the material to be sucked stuck between the bent second tube segment 200 and the bent active bending section 710 into the anti-blocking portion 210, thereby reducing the risk of stones waiting to be sucked blocking the second tube segment 200.

[0056] See also Figures 2 to 4 as well as Figure 7In order to facilitate the insertion of the sheath 10 into the human body, in an optional embodiment, the anti-blocking portion 210 also has a contracted state. Of course, the state of the anti-blocking portion 210 can also be only an expanded state, that is, the anti-blocking portion 210 can always be in an expanded state, and the present application does not limit this. The anti-blocking portion 210 can switch between the expanded state and the contracted state. When the anti-blocking portion 210 is in the contracted state, at least part of the anti-blocking portion 210 is flush with or radially convex to other parts of the sheath 10, that is, along the direction extending from the outside of the anti-blocking portion 210 to the inside, at least part of the anti-blocking portion 210 protrudes from other parts of the sheath 10, and the flow area of ​​the first inner cavity is less than or equal to the flow area of ​​the second inner cavity. Specifically, when the anti-blocking portion 210 is in the contracted state, all parts of the anti-blocking portion 210 can be flush with or radially convex to other parts of the sheath 10, or a part of the anti-blocking portion 210 is flush with other parts of the sheath 10, and the other part is radially convex to other parts of the sheath 10.

[0057] The sheath assembly further includes a driving mechanism, which can switch the anti-blocking portion 210 from a contracted state to an expanded state.

[0058] In this embodiment, the anti-blockage portion 210 can switch between a contracted state and an expanded state. Before the sheath 10 is inserted into the human body, the anti-blockage portion 210 can be switched to the contracted state. At this time, at least part of the anti-blockage portion 210 is flush with or radially protrudes inward from other parts of the sheath 10, that is, all parts of the anti-blockage portion 210 do not protrude radially outward from other parts of the sheath 10, which facilitates the insertion of the sheath 10 into the human body.

[0059] In some embodiments, the anti-blocking portion 210 includes a deformable body 2111 and a deformation memory metal support, the deformable body 2111 has a first inner cavity, the deformation memory metal support is connected to the deformable body 2111, and the driving mechanism includes a conductive wire, which is electrically connected to the deformation memory metal support. When the deformation memory metal support is not energized through the conductive wire, the deformation memory metal support is in a contracted state, so that the anti-blocking portion 210 is in a contracted state; when the deformation memory metal support is energized through the conductive wire, the deformation memory metal support is in an expanded state, so that the anti-blocking portion 210 is in an expanded state.

[0060] In other embodiments, the anti-blocking portion 210 includes a flexible deformer, and the driving mechanism includes a transmission rod 400, which is connected to the distal end of the flexible deformer, and the transmission rod 400 can move between the third position and the fourth position to make the flexible deformer in an expanded state or a contracted state. For example, the direction extending from the third position to the fourth position can be the direction extending from the proximal end to the distal end of the sheath tube 10. At this time, when the transmission rod 400 is located in the third position, the distal end of the flexible deformer is closer to the proximal end of the flexible deformer, and the transmission rod 400 is in an expanded state; in the process of the transmission rod 400 moving from the third position to the fourth position, the transmission rod 400 drives the distal end of the flexible deformer away from the proximal end of the flexible deformer, so that the flexible deformer switches from the expanded state to the contracted state. Of course, the direction extending from the fourth position to the third position can also be the direction extending from the proximal end to the distal end of the sheath tube 10.

[0061] In some other embodiments, the anti-blocking portion 210 is an elastic deformable body, and the anti-blocking portion 210 is in an expanded state in a natural state. The driving structure includes a constraint tube, and the constraint tube is slidably sleeved outside the sheath tube 10. The staggered setting here refers to the staggered setting of the constraint tube and the anti-blocking portion 210 in the radial direction of the constraint tube. In the case where the constraint tube is sleeved outside the anti-blocking portion 210, the anti-blocking portion 210 undergoes elastic contraction to be in a contracted state; in the case where the constraint tube and the anti-blocking portion 210 are staggered, the anti-blocking portion 210 restores the elastic deformation to be in an expanded state. It should be noted that when this embodiment is combined with the embodiment described below in which the sheath tube assembly includes a retainer 300, the retainer 300 is a structural member with a certain rigidity and a certain bending performance, such as a slender rod, a steel wire, etc. At this time, the retainer 300 can prevent the distal end of the second tube segment 200 from moving in a direction close to and / or away from the first tube segment 100.

[0062] In an optional embodiment, the sheath tube 10 includes a first tube segment 100 and a second tube segment 200 sequentially distributed in a direction extending from the proximal end to the distal end thereof, that is, the distal end of the first tube segment 100 is connected to the proximal end of the second tube segment 200. Specifically, the proximal end of the sheath tube 10 can be fixedly connected to the distal end of the operating handle of the guide sheath.

[0063] The sheath assembly also includes a retaining member 300, and the first tube segment 100 is slidably connected to the second tube segment 200. Here, the first tube segment 100 can be connected to the inside or outside of the second tube segment 200. One of the distal end of the first tube segment 100 and the proximal end of the second tube segment 200 is provided with an anti-blocking portion 210. One end of the retaining member 300 is connected to the second tube segment 200, and the other end is connected to the first tube segment 100 or the operating handle of the guide sheath to fix the length of the sheath 10.

[0064] It should be noted that, since the anti-blocking portion 210 can switch between the contracted state and the expanded state, and the length of the anti-blocking portion 210 itself will change during the switching process, for example, when the anti-blocking portion 210 switches from the contracted state to the expanded state, the anti-blocking portion 210 will expand radially, but its length will be shortened. Therefore, when the connection relationship between the first tube segment 100 and the second tube segment 200 is a fixed connection, the length change of the anti-blocking portion 210 will cause the length of the sheath tube 10 to change, which will obviously cause the sheath tube 10 to approach or move away from the object to be sucked, thereby causing the relative position between the distal end opening of the second tube segment 200 and the object to be sucked to change.

[0065] After adopting the structure of the embodiment of the present application, the anti-blocking portion 210 is arranged on the first tube segment 100 or the second tube segment 200, and the retaining member 300 can fix the length of the sheath tube 10, but the length change of the anti-blocking portion 210 will change the length of the first tube segment 100 or the second tube segment 200, while the length of the sheath tube 10 will not change. Therefore, in order to compensate for the length change of the first tube segment 100 or the second tube segment 200, the embodiment of the present application slides the first tube segment 100 and the second tube segment 200 together, thereby compensating the length change of the first tube segment 100 or the second tube segment 200 as the relative sliding of the distal end of the first tube segment 100 and the proximal end of the second tube segment 200 to ensure that the length of the sheath tube 10 does not change.

[0066] Optionally, the first pipe segment 100 and the second pipe segment 200 are slidably sealed, for example, a sealing structure (such as an O-ring) may be provided between the first pipe segment 100 and the second pipe segment 200 to prevent the suctioned material from leaking out of the sheath tube 10 from the slidably fitted portion between the first pipe segment 100 and the second pipe segment 200. The sheath tube assembly may further include a skin 600, which covers the outside of the sheath tube 10.

[0067] The embodiment of the present application fixes the length of the sheath 10 by the retaining member 300, thereby preventing the length of the sheath 10 from changing when the anti-blocking portion 210 expands and contracts, thereby preventing the relative position between the distal opening of the second tube segment 200 and the object to be aspirated from changing, thereby eliminating the need to adjust the position of the sheath 10 and the endoscope to direct the distal opening of the sheath 10 toward the object to be aspirated, thereby simplifying the operation process.

[0068] See also Figures 1 to 9In an optional embodiment, the anti-blocking portion 210 is arranged on the second tube segment 200, one end of the retaining member 300 is connected to the distal end of the anti-blocking portion 210 or the portion of the second tube segment 200 located on the distal side of the anti-blocking portion 210, and the driving mechanism includes a transmission rod 400 capable of transmitting thrust, and the transmission rod 400 is connected to the proximal end of the anti-blocking portion 210 or the portion of the second tube segment 200 located on the proximal side of the anti-blocking portion 210. When the transmission rod 400 is subjected to thrust, the anti-blocking portion 210 can switch from a contracted state to an expanded state.

[0069] The specific operation process of this embodiment is as follows: the transmission rod 400 is pushed, and the transmission rod 400 can drive the proximal end of the anti-blocking part 210 to move in the opposite direction of the second direction, so that the proximal end of the anti-blocking part 210 is close to the distal end of the anti-blocking part 210, so that the length of the anti-blocking part 210 is compressed to produce radial expansion. During this process, the transmission rod 400 applies a force in the opposite direction of the second direction to the second pipe segment 200, and the retaining member 300 can resist the force to prevent the second pipe segment 200 from moving in the opposite direction of the second direction. After releasing the transmission rod 400, the anti-blocking portion 210 will restore its elastic deformation, and the proximal end of the anti-blocking portion 210 will gradually move away from the distal end of the anti-blocking portion 210, so that the anti-blocking portion 210 returns to its original length to switch to the contracted state. During this process, the anti-blocking portion 210 will not be subjected to the force in the second direction, which not only reduces the risk of changes in the position maintained by the second tube segment 200, but also enables the retaining member 300 to not have the function of resisting the force in the second direction. For example, the retaining member 300 may be a retaining rope, which may not have a certain rigidity, thereby simplifying the structure of the retaining member 300. Of course, the retaining member 300 of this embodiment may also have a certain rigidity, and the present application does not limit this.

[0070] In an optional embodiment, at least part of the transmission rod 400 is slidably sleeved outside the retaining member 300. Optionally, the transmission rod 400 can be disposed inside or outside the sheath tube 10, and the present application is not limited thereto. In this way, in the process of pushing the transmission rod 400, the ability of the retaining member 300 to maintain its own shape can be utilized to limit the bending deformation of the transmission rod 400 when being pushed, so that the transmission rod 400 can stably transmit the thrust, so that the anti-blocking portion 210 can stably switch to the expanded state.

[0071] See also Figure 12 to Figure 14In an optional embodiment, the joint between the retainer 300 and the second tube section 200 is a first joint, and when the anti-blocking portion 210 is in an expanded state, the transmission rod 400 and the first joint are in upper limit contact in the direction extending from the proximal end to the distal end of the sheath tube 10, so that the transmission rod 400 can be prevented from moving too much in the opposite direction of the second direction, thereby preventing the anti-blocking portion 210 from being axially compressed too much and affecting the elastic performance of the anti-blocking portion 210, and preventing the proximal end of the anti-blocking portion 210 from moving too much in the opposite direction of the second direction following the transmission rod 400 and being disengaged from the first tube section 100. In addition, this embodiment uses the joint between the retainer 300 and the second tube section 200 to limit the transmission rod 400, so there is no need to add other additional limiting structures to limit the transmission rod 400 or the proximal end of the anti-blocking portion 210, which can simplify the structure of the sheath tube assembly.

[0072] See also Figures 2 to 4 In an optional embodiment, when the anti-blocking portion 210 is in a contracted state, a portion of the anti-blocking portion 210 is sleeved in the first tube segment 100 or the second tube segment 200, that is, when the anti-blocking portion 210 is arranged in the first tube segment 100, the distal end of the anti-blocking portion 210 is sleeved in the second tube segment 200; when the anti-blocking portion 210 is arranged in the second tube segment 200, the proximal end of the anti-blocking portion 210 is sleeved in the first tube segment 100. In this embodiment, the first tube segment 100 or the second tube segment 200 can be used to limit the radial expansion of the portion of the anti-blocking portion 210, so that when the sheath assembly is inserted into the human body, even if the human tissue exerts a reaction force along the second direction on the sheath 10, the first tube segment 100 or the second tube segment 200 can prevent the anti-blocking portion 210 from expanding under the force, that is, the structure of this embodiment can prevent the anti-blocking portion 210 from expanding when it is necessary to maintain a contracted state, so as to facilitate the insertion of the sheath assembly into the human body.

[0073] In a further embodiment, one of the first pipe segment 100 and the second pipe segment 200 that can be sleeved outside the anti-blocking portion 210 is provided with a deformation notch 111, the deformation notch 111 penetrates the side wall of the first pipe segment 100 or the second pipe segment 200, and the deformation notch 111 extends to the end face of the first pipe segment 100 or the second pipe segment 200 close to the anti-blocking portion 210.

[0074] In the present embodiment, one of the first pipe segment 100 and the second pipe segment 200 that can be sleeved outside the anti-blocking portion 210 is provided with a deformation notch 111, which can reduce the stiffness of the first pipe segment 100 or the second pipe segment 200. In this way, when the portion of the anti-blocking portion 210 sleeved inside the first pipe segment 100 or the second pipe segment 200 gradually disengages from the first pipe segment 100 or the second pipe segment 200, the first pipe segment 100 or the second pipe segment 200 will be radially deformed under the action of the radial expansion force of the anti-blocking portion 210, which can cause the portion of the anti-blocking portion 210 located inside the first pipe segment 100 or the second pipe segment 200 to also expand outward, thereby preventing the anti-blocking portion 210 from suddenly switching from an expanded state to a contracted state at the pipe mouth of the first pipe segment 100 or the second pipe segment 200, thereby reducing the risk of damage to the anti-blocking portion 210.

[0075] Optionally, one of the first tube section 100 and the second tube section 200 that can be sleeved outside the anti-blocking part 210 includes a sleeve portion 110. When the anti-blocking part 210 is in a contracted state, a portion of the anti-blocking part 210 is sleeved inside the sleeve portion 110, and the sleeve portion 110 is provided with the above-mentioned deformation notch 111. Taking the sleeve portion 110 provided at the distal end of the first tube section 100 as an example, the inner hole size of the sleeve portion 110 is larger than the inner hole size of the portion of the first tube section 100 located outside the sleeve portion 110, thereby forming a step at the proximal end of the sleeve portion 110, and the step here can stop and limit the second tube section 200 in the direction extending from the distal end to the proximal end of the sheath tube 10.

[0076] Optionally, the anti-blocking portion 210 includes a main body 211 and a mounting ring 212. The main body 211 is capable of radial expansion. The main body 211 here may include a deformable body 2111 and an elastic bracket 2112. For example, the main body 211 is a coated bracket. Mounting rings 212 are provided at both ends of the main body 211, and the mounting rings 212 are slidably matched with the sleeve portion 110.

[0077] The present application also discloses a guide sheath, including the sheath tube assembly described in any of the above embodiments, so that the guide sheath has the beneficial effects of the above sheath tube assembly, which will not be repeated here. Optionally, the guide sheath also includes an operating handle (not shown in the figure), and the proximal end of the sheath tube 10 is connected to the distal end of the operating handle.

[0078] 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 sheath tube assembly of a guide sheath, characterized in that: The sheath tube (10) comprises a positioning space for accommodating at least a portion of an insertion portion (700) of an endoscope, wherein the axis of the positioning space is located on a first side of the axis of the sheath tube (10), and the other side of the axis of the sheath tube (10) is a second side opposite to the first side; The sheath tube (10) is provided with a force-applying structure, and the force-applying structure is capable of applying a force in a first direction to a portion of the insertion portion (700) located in the positioning space, wherein the first direction is a direction extending from the second side to the first side; The sheath tube (10) comprises a first tube section (100) and a second tube section (200), the proximal end of the second tube section (200) being connected to the distal end of the first tube section (100), at least the tube section of the second tube section (200) close to its own distal end opening being able to bend following the active bending section (710) of the endoscope, the positioning space and the force-applying structure being both provided on the first tube section (100), the positioning space being used to accommodate at least a portion of the passive bending section (720) of the insertion portion (700); The second tube section (200) is provided with an anti-blocking portion (210), and the anti-blocking portion (210) has an expanded state. When the anti-blocking portion (210) is in the expanded state, at least a portion of the anti-blocking portion (210) radially protrudes outward from other portions of the sheath tube (10), and a flow area of ​​a first inner cavity of the anti-blocking portion (210) is greater than a flow area of ​​a second inner cavity of other portions of the sheath tube (10).

2. The sheath tube assembly according to claim 1, characterized in that: The force-applying structure comprises a protrusion (500) radially protruding from the inner wall of the sheath tube (10), the protrusion (500) being connected to the sheath tube (10), and the protrusion (500) radially extending to the positioning space so that the protrusion (500) contacts the insertion portion (700) located in the positioning space, and the insertion portion (700) cooperates with the protrusion (500) in an upper limit position in the opposite direction of the first direction.

3. The sheath tube assembly according to claim 2, characterized in that: The protrusion (500) comprises a first protrusion (510) and a second protrusion (520), wherein the first protrusion (510) and the second protrusion (520) are respectively located on two sides of the sheath tube (10) along a second direction, and the second direction is respectively perpendicular to the first direction and the axial direction of the sheath tube (10).

4. The sheath tube assembly according to claim 3, characterized in that: The first protrusion (510) and the second protrusion (520) both include an abutment area (501) capable of contacting the insertion portion (700); the abutment area (501) of the first protrusion (510) and the abutment area (501) of the second protrusion (520) are both located on the side of the axis of the positioning space facing the second side; along the second direction, the abutment area (501) of the first protrusion (510) and the abutment area (501) of the second protrusion (520) are staggered.

5. The sheath tube assembly according to any one of claims 2 to 4, characterized in that: A partial area of ​​the side wall of the sheath tube (10) is recessed inwards to form the protrusion (500); and / or, The protrusion (500) extends continuously from the distal end of the sheath tube (10) to the proximal end of the sheath tube (10); and / or, The protruding portion (500) is provided with a penetration hole, and the penetration hole penetrates the protruding portion (500) along the axial direction of the sheath tube (10).

6. The sheath tube assembly according to any one of claims 1 to 4, characterized in that: Along the first direction, the minimum distance between the axis of the positioning space and the inner wall of the sheath tube (10) is D1, the radius of the positioning space is R1, and D1=R1.

7. The sheath tube assembly according to any one of claims 1 to 4, characterized in that: The tube section of the sheath tube (10) close to its own distal opening is capable of bending following the active bending section (710) of the endoscope, and the first side and the second side are respectively located on opposite sides of the sheath tube (10) along its own bending direction.

8. The sheath tube assembly according to any one of claims 1 to 4, wherein the anti-blockage portion (210) further has a contracted state, and the anti-blockage portion (210) can be switched between the expanded state and the contracted state, and when the anti-blockage portion (210) is in the contracted state, at least a portion of the anti-blockage portion (210) is flush with or radially convex to other portions of the sheath tube (10), and the flow area of ​​the first inner cavity is less than or equal to the flow area of ​​the second inner cavity; The sheath tube assembly further comprises a driving mechanism, wherein the driving mechanism is capable of switching the anti-blocking portion (210) from the contracted state to the expanded state.

9. A guide sheath, characterized in that: Comprising the sheath assembly according to any one of claims 1 to 8.

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