Flexible guiding sheath tube and guiding device

Abstract

The present invention provides a bendable guiding sheath tube and a guiding device. The middle tube section of the bendable guiding sheath tube is connected between the bendable tube section and the sheath tube joint. The bendable tube section includes at least two mortise and tenon connectors, and the mortise and tenon connectors are sequentially inserted along the axial direction of the middle tube section. The bendable tube section is configured to axially bend relative to the middle tube section through the relative sliding between the mortise and tenon connectors when a lateral force is applied. By setting the bendable tube section as at least two mortise and tenon connectors inserted along the axial direction of the middle tube section, the present invention enables the bendable guiding sheath tube to approach the stone fragments in the kidney, and then flushes out the stone fragments through the water flow perfused during the operation, thereby improving the discharge efficiency of the stone fragments, avoiding the situations that affect the surgical efficiency such as the stone powder affecting the vision or accumulating in the kidney, and improving the stone clearance rate.

Description

Technical Field

[0001] The present invention belongs to the field of medical technology, and particularly relates to a flexible guiding sheath tube and a guiding device. Background Art

[0002] Flexible ureteroscopy lithotripsy uses a thin endoscope with a diameter of about 3 mm to insert through the urethra and bladder into the ureter to break and remove ureteral stones or kidney stones. The guiding sheath tube is a commonly used consumable in flexible ureteroscopy surgery, which is used to establish a channel from the outside through the urethra and ureter directly into the renal pelvis. The flexible ureteroscope directly enters the surgical area under the guidance of the guiding sheath tube, and can conveniently perform relevant operations without being affected by the bending state and thickness of the ureter and urethra.

[0003] Currently, the main body of the guiding sheath tube used in flexible ureteroscopy surgery is a relatively flexible tube, which usually emphasizes the compressive and anti-twisting properties, so that after being placed into the human body along the guide wire, the flexible part of the ureter can be relatively straightened through the flexibility of the guiding sheath tube, thereby facilitating the entry, rotation and other operations of the endoscope. The disadvantages of the above guiding sheath tube are as follows: due to the flexibility of the guiding sheath tube, it can only be placed in the upper segment of the ureter or just entering the renal pelvis to form a channel parallel to the body's longitudinal axis, but cannot bend into the deeper part of the renal pelvis and renal calyces. Therefore, it is difficult to approach the crushed stones during the operation, and the stone fragments cannot be flushed out of the guiding sheath tube through the water flow infused during the operation. Therefore, the efficiency of removing stone fragments in flexible ureteroscopy surgery is low. Summary of the Invention

[0004] In view of the above technical problems, the embodiments of the present invention provide a flexible guiding sheath tube and a guiding device, in which the flexible guiding sheath tube in the prior art has high flexibility and cannot be bent.

[0005] In view of the above technical problems, an embodiment of the present invention provides a flexible guiding sheath tube, which includes a flexible tube section, an intermediate tube section, and a sheath tube joint, and the intermediate tube section is connected between the flexible tube section and the sheath tube joint; the flexible tube section includes at least two mortise and tenon connectors, and each of the mortise and tenon connectors is inserted axially along the intermediate tube section in sequence; the flexible tube section is used for axially bending relative to the intermediate tube section through the relative sliding between the mortise and tenon connectors when a lateral force is applied.

[0006] Optionally, the flexible tube section further includes an elastic material layer covering the surface of the mortise and tenon connectors.

[0007] Optionally, the mortise and tenon connector includes a first body, at least two first insertion portions, and at least two second insertion portions. The first insertion portions and the second insertion portions are symmetrically connected to opposite sides of the first body. A first insertion chute is formed between the two first insertion portions for the second insertion portion of an adjacent mortise and tenon connector to insert and slide relatively. A second insertion chute is formed between the two second insertion portions for the first insertion portion of an adjacent mortise and tenon connector to insert and slide relatively.

[0008] Optionally, the first insertion portion includes a first plug and a first connection section connecting the first body and the first plug. The second insertion portion includes a second plug and a second connection section connecting the second body and the second plug. The first insertion chute is provided with a first limiting opening for the second connection section to pass through. The second insertion chute is provided with a second limiting opening for the first connection section to pass through. In a direction perpendicular to the axial direction of the unbent bendable pipe section, the maximum width of the first plug is greater than the width of the second limiting opening. When the bendable pipe section is bent, the first plug slides relatively along the second insertion chute. The maximum width of the second plug is greater than the width of the first limiting opening. When the bendable pipe section is bent, the second plug slides relatively along the first insertion chute.

[0009] Optionally, the mortise and tenon connector includes a second body, a first rotation groove provided on the first side of the second body, a first stopper connected to the second side of the second body, and a first rotation block connected to the second side of the first stopper. The first rotation groove is provided with a first opening for the first stopper of an adjacent mortise and tenon connector to pass through. The first rotation groove is for accommodating the first rotation block of an adjacent mortise and tenon connector. The maximum width of the first rotation block is greater than the width of the first opening.

[0010] When the bendable pipe section is bent, the first rotation block rotates relative to the first rotation groove. When the first rotation blocks of two adjacent mortise and tenon connectors are abutted against the edge of the first opening, the rotation of the two adjacent mortise and tenon connectors stops.

[0011] Optionally, the mortise and tenon connector further includes a second stopper connected to the inner side wall of the first rotation groove and a second rotation block connected to the first side of the second stopper and located in the first rotation groove. The first rotation block is provided with a second rotation groove. The second rotation groove is provided with a second opening that is arranged away from the first opening and for the second stopper of an adjacent mortise and tenon connector to pass through. The second rotation groove is for accommodating the second rotation block of an adjacent mortise and tenon connector. The maximum width of the second rotation block is greater than the width of the second opening.

[0012] When the bendable pipe section is bent, the first rotating block rotates relative to the first rotating groove, and the second rotating block rotates relative to the second rotating groove. When the first rotating block of two adjacent tenon-and-mortise connectors abuts against the edge of the first opening or the second rotating block abuts against the edge of the second opening, the rotation of two adjacent tenon-and-mortise connectors stops.

[0013] Optionally, the tenon-and-mortise connector further includes a third stopper connected to the inner side wall of the second rotating groove, and a third rotating block connected to the third stopper and located in the second rotating groove; a third rotating groove is provided on the second rotating block, and a third opening for the third stopper of an adjacent tenon-and-mortise connector to pass through is provided on the third rotating groove; the third rotating groove is used to accommodate the third rotating block of an adjacent tenon-and-mortise connector; the maximum width of the third rotating block is greater than the width of the third opening;

[0014] When the bendable pipe section is bent, the first rotating block rotates relative to the first rotating groove, the second rotating block rotates relative to the second rotating groove, and the third rotating block rotates relative to the third rotating groove. When the first rotating block of two adjacent tenon-and-mortise connectors abuts against the edge of the first opening, the second rotating block abuts against the edge of the second opening, or the third rotating block abuts against the edge of the third opening, the rotation of two adjacent tenon-and-mortise connectors stops.

[0015] Optionally, the opening direction of the third opening and the second opening is set at a preset angle.

[0016] Optionally, the tenon-and-mortise connector further includes a first card slot and a second card slot respectively arranged on opposite sides of the second stopper; on opposite sides of the second opening, a first buckle adapted to the first card slot and a second buckle adapted to the second card slot are respectively provided;

[0017] When the bendable pipe section is bent, the first rotating block rotates relative to the first rotating groove, and the second rotating block rotates relative to the second rotating groove;

[0018] When the second stopper of two adjacent tenon-and-mortise connectors abuts against the edge of the second opening, the rotation of two adjacent tenon-and-mortise connectors stops; when the first buckle is engaged with the first card slot or the second buckle is engaged with the second card slot, the relative rotational position between two adjacent tenon-and-mortise connectors is fixed.

[0019] An embodiment of the present invention further provides a guiding device, including a dilator and the above-mentioned bendable guiding sheath, and the dilator passes through the bendable guiding sheath and is connected to the sheath joint.

[0020] The bendable guiding sheath of the present invention divides the bendable guiding sheath into three parts: a bendable tube section, an intermediate tube section, and a sheath joint. By setting the bendable tube section as at least two mortise-and-tenon connectors inserted axially along the intermediate tube section in sequence, the bendable guiding sheath can be bent into the required shape, so that the bendable guiding sheath can approach the stone fragments in the kidney through the bendable tube section, and then the stone fragments can be flushed out of the bendable guiding sheath through the water flow perfused during the operation. In this way, the discharge efficiency of the stone fragments is improved, the situation that the stone powder affects the vision or accumulates in the kidney and affects the operation efficiency is avoided, the uncertainty of natural stone discharge can also be avoided, and the stone clearance rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the drawings and embodiments.

[0022] Figure 1 It is a schematic structural diagram of the bendable guiding sheath provided by an embodiment of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the bendable guiding sheath provided by another embodiment of the present invention.

[0024] Figure 3 It is the Figure 2 schematic structural diagram of the mortise-and-tenon connector of the bendable guiding sheath in the present invention.

[0025] Figure 4 It is a schematic structural diagram of the bendable guiding sheath provided by still another embodiment of the present invention.

[0026] Figure 5 It is the Figure 4 schematic structural diagram of the mortise-and-tenon connector of the bendable guiding sheath in the present invention.

[0027] Figure 6 It is a schematic structural diagram of the bendable guiding sheath provided by yet another embodiment of the present invention.

[0028] Figure 7 It is the Figure 6 schematic structural diagram of the mortise-and-tenon connector of the bendable guiding sheath in the present invention.

[0029] Figure 8 It is a schematic structural diagram of the guiding device provided by an embodiment of the present invention.

[0030] The reference numerals in the specification are as follows:

[0031] 1. Bendable pipe section, 2. Intermediate pipe section, 3. Sheath joint, 4. Dilator, 11. Mortise and tenon connector, 12. Elastic material layer, 1101. First body, 1102. First insertion part, 1103. Second insertion part, 1104. First insertion chute, 1105. Second insertion chute, 11021. First plug, 11022. First connection section, 11041. First limit port, 11031. Second plug, 11032. Second connection section, 11051. Second limit port, 11023. First arc surface, 11033. Second arc surface, 11052. Second arc groove, 11042. First arc groove, 1106. Second body, 1107. First rotation groove, 1108. First stop block, 1109. First rotation block, 11071. First opening, 1110. Second stop block, 1111. Second rotation block, 1112. Second rotation groove, 11121. Second opening, 1113. Third stop block, 1114. Third rotation block, 1115. Third rotation groove, 11151. Third opening, 1116. First card slot, 1117. Second card slot, 1118. First buckle, 1119. Second buckle, 22. First protective layer, 23. Support structure layer, 24. Second protective layer. Detailed implementation mode

[0032] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0034] Such as Figure 1As shown in the figure, an embodiment of the present invention provides a bendable guiding sheath, which includes a bendable tube section 1, an intermediate tube section 2, and a sheath joint 3. The intermediate tube section 2 is connected between the bendable tube section 1 and the sheath joint 3. The bendable tube section 1 includes at least two mortise and tenon connectors 11, and each of the mortise and tenon connectors 11 is axially inserted in sequence along the intermediate tube section 2. The bendable tube section 1 is configured to axially bend relative to the intermediate tube section 2 through the relative sliding between the mortise and tenon connectors 11 when a lateral force is applied. In one embodiment, the connection manner between the intermediate tube section 2, the bendable tube section 1, and the sheath joint 3 includes, but is not limited to, one or more of connection manners such as integral molding, bonding, welding, snap connection, or screw connection. It can be understood that as long as the connection manner can achieve the effect of firmly connecting the intermediate tube section 2, the bendable tube section 1, and the sheath joint 3, it is acceptable.

[0035] In one embodiment, as Figure 1 shown, the intermediate tube section 2 includes a first protective layer 22, a support structure layer 23, and a second protective layer 24. The first protective layer 22 covers the outer sidewall of the support structure layer 23, and the second protective layer 24 covers the inner sidewall of the spring layer. Further, the support structure layer 23 is a spring layer, the first protective layer 22 is a PEBAX (block polyether amide resin) material layer, and the second protective layer 24 is a PTFE (polytetrafluoroethylene) material layer. It can be understood that the first protective layer 22 and the second protective layer 24 respectively cover the outer surface and the inner surface of the support structure layer 23 to protect the support structure layer 23. In one embodiment, the surfaces of the first protective layer 22 and the second protective layer 24 in contact with the outside also include lubricating coatings. The lubricating coating provided on the first protective layer 22 covering the outer surface of the support structure layer 23 is used to make the entry and exit of the intermediate tube section 2 itself into the ureter smoother; the lubricating coating provided on the second protective layer 24 covering the inner surface of the support structure layer 23 is used to make the entry and exit of a flexible endoscope or other instruments into the intermediate tube section 2 smoother.

[0036] In the embodiment of the present invention, the flexible guiding sheath tube is divided into three parts: a flexible tube section 1, an intermediate tube section 2, and a sheath tube joint 3. In the above embodiment, the support structure layer 23 of the intermediate tube section 2 is a spring layer, so that the intermediate tube section 2 retains the toughness of the guiding sheath tube in the prior art. However, on this basis, a flexible tube section 1 is added. By setting the flexible tube section 1 as at least two mortise and tenon connectors 11 sequentially inserted along the axial direction of the intermediate tube section 2, the flexible guiding sheath tube can be bent into the required shape, so that the flexible guiding sheath tube can approach the stone fragments in the kidney through the flexible tube section 1, and then the stone fragments are flushed out of the flexible guiding sheath tube through the water flow perfused during the operation. In this way, the discharge efficiency of the stone fragments is improved, and the situation that affects the surgical efficiency, such as the stone powder affecting the vision or accumulating in the kidney, is avoided. The uncertainty of natural stone discharge can also be avoided, and the stone removal is improved.

[0037] In one embodiment, as Figure 1 shown, the flexible tube section 1 further includes an elastic material layer 12 covering the surface of the mortise and tenon connector 11. It can be understood that the elastic material layer 12 is used to limit the movement of the mortise and tenon connector 11 in the radial direction of the flexible tube section 1 to bind the mortise and tenon connector 11 so that they do not separate from each other, and deforms when the flexible tube section 1 is bent, and always covers the surface of the mortise and tenon connector 11. The elastic material layer 12 can cover the outer surface and / or the inner surface of the mortise and tenon connector 11 to prevent the mortise and tenon connector 11 from directly contacting the outside and causing interference. In one embodiment, the innermost layer and the outermost layer of the flexible tube section 1 further include a lubricating coating for making the flexible tube section 1 more smooth when being inserted or inserted into.

[0038] In one embodiment, as Figure 2 and Figure 3As shown, the mortise and tenon connector 11 includes a first body 1101, at least two first insertion parts 1102, and at least two second insertion parts 1103. The first insertion parts 1102 and the second insertion parts 1103 are symmetrically connected to opposite sides of the first body 1101. A first insertion chute 1104 is formed between the two first insertion parts 1102 for the second insertion part 1103 of an adjacent mortise and tenon connector 11 to insert and slide relatively. A second insertion chute 1105 is formed between the two second insertion parts 1103 for the first insertion part 1102 of an adjacent mortise and tenon connector 11 to insert and slide relatively. It can be understood that the first body 1101 can be an annular structure, a sheet structure, or other shapes, as long as the bendable pipe section 1 can be bent when the mortise and tenon connector 11 is stretched and / or contracted. Preferably, the first body 1101 is an annular structure. The first insertion parts 1102 and the first insertion chute 1104 are distributed on one side of the first body 1101, and the second insertion parts 1103 and the second insertion chute 1105 are distributed on the other side of the first body 1101. A plurality of the first insertion parts 1102 are inserted into and slidable in the second insertion chute 1105, and the second insertion parts 1103 are inserted into and slidable in the first insertion chute 1104. Thus, through the above sliding connection relationship, a bendable tubular structure is formed between the mortise and tenon connectors 11.

[0039] In an embodiment, as Figure 2 and Figure 3As shown, the first plug-in part 1102 includes a first plug 11021 and a first connecting section 11022 connected between the first body 1101 and the first plug 11021; the second plug-in part 1103 includes a second plug 11031 and a second connecting section 11032 connected between the second body 1106 and the second plug 11031; a first limiting port 11041 through which the second connecting section 11032 passes is provided on the first plug-in chute 1104; a second limiting port 11051 through which the first connecting section 11022 passes is provided on the second plug-in chute 1105; in a direction perpendicular to the axial direction of the non-bent flexible pipe section 1, the maximum width of the first plug 11021 is greater than the width of the second limiting port 11051; when the flexible pipe section 1 is bent, the first plug 11021 slides relatively along the second plug-in chute 1105; the maximum width of the second plug 11031 is greater than the width of the first limiting port 11041; when the flexible pipe section 1 is bent, the second plug 11031 slides relatively along the first plug-in chute 1104. It can be understood that in a direction perpendicular to the axial direction of the non-bent flexible pipe section 1, the maximum width of the first plug 11021 is greater than the width of the second limiting port 11051, and the second limiting port 11051 plays a limiting role to prevent the first plug-in part 1102 from detaching from the second plug-in chute 1105; the maximum width of the second plug 11031 is greater than the width of the first limiting port 11041, and the first limiting port 11041 plays a limiting role to prevent the second plug-in part 1103 from detaching from the first plug-in chute 1104. It can be understood that in a direction perpendicular to the axial direction of the non-bent flexible pipe section 1, the maximum width of the first plug 11021 is less than or equal to the width of the second plug-in chute 1105, so that the first plug 11021 can slide in the second plug-in chute 1105; the maximum width of the second plug 11031 is less than or equal to the width of the first plug-in chute 1104, so that the second plug 11031 can slide in the first plug-in chute 1104. It can be understood that in a direction perpendicular to the axial direction of the non-bent flexible pipe section 1, the maximum width of the first connecting section 11022 is less than the width of the second limiting port 11051, so that when the first plug 11021 slides relatively along the second plug-in chute 1105, the first connecting section 11022 slides in the second limiting port 11051; the maximum width of the second connecting section 11032 is less than the width of the first limiting port 11041, so that when the second plug 11031 slides relatively along the first plug-in chute 1104, the second connecting section 11032 slides in the first limiting port 11041.

[0040] In one embodiment, as Figure 2 and Figure 3 shown, one end of the first plug 11021 away from the first body 1101 is provided with a first arc surface 11023, one end of the second plug 11031 away from the first body 1101 is provided with a second arc surface 11033, one end of the second insertion chute 1105 close to the first body 1101 is provided with a second arc groove 11052 matching the first arc surface 11023, one end of the first insertion chute 1104 close to the first body 1101 is provided with a first arc groove 11042 matching the second arc surface 11033, a second limiting port 11051 is formed between the two second plugs 11031, the first plug 11021 can rotate in the second insertion chute 1105, a first limiting port 11041 is formed between the two first plugs 11021, and the second plug 11031 can rotate in the first insertion chute 1104.

[0041] In the embodiment of the present invention, by providing at least two annularly mutually inserted mortise and tenon connectors 11, and the mortise and tenon connectors 11 are of a mortise and tenon structure with semi-circular concave-convex combination, the effect of universal bending of the bendable pipe section 1 is realized, and the bendable pipe section 1 can be telescoped within a certain limit, so that the sheath opening of the bendable guiding sheath can be more conveniently close to the direction of the stone in the kidney.

[0042] In one embodiment, as Figure 4 and Figure 5As shown, the mortise and tenon connector 11 includes a second body 1106, a first rotating groove 1107 provided on the first side of the second body 1106, a first stopper 1108 connected to the second side of the second body 1106, and a first rotating block 1109 connected to the second side of the first stopper 1108; a first opening 11071 for allowing the first stopper 1108 of the adjacent mortise and tenon connector 11 to pass through is provided on the first rotating groove 1107, and the first rotating groove 1107 is used to accommodate the first rotating block 1109 of the adjacent mortise and tenon connector 11; the maximum width of the first rotating block 1109 is greater than the width of the first opening 11071; when the bendable pipe section 1 is bent, the first rotating block 1109 and the first rotating groove 1107 rotate relative to each other, and when the first rotating blocks 1109 of two adjacent mortise and tenon connectors 11 are abutted against the edge of the first opening 11071, the rotation of the two adjacent mortise and tenon connectors 11 stops. In an embodiment, the maximum width of the first rotating block 1109 is greater than the width of the first opening 11071, so the first rotating block 1109 can be embedded in the first rotating groove 1107 to rotate without detachment, thereby realizing the rotation of the first rotating block 1109 in the first rotating groove 1107; the first stopper 1108 is used to limit the rotation angle between the two mortise and tenon connectors 11.

[0043] In an embodiment, as Figure 4 and Figure 5As shown, the mortise and tenon connector 11 further includes a second stopper 1110 connected to the inner sidewall of the first rotation groove 1107, and a second rotation block 1111 connected to the first side of the second stopper 1110 and located in the first rotation groove 1107; a second rotation groove 1112 is provided on the first rotation block 1109, and a second opening 11121 is provided on the second rotation groove 1112 and is arranged away from the first opening 11071 for the second stopper 1110 of the adjacent mortise and tenon connector 11 to pass through; the second rotation groove 1112 is used to accommodate the second rotation block 1111 of the adjacent mortise and tenon connector 11; the maximum width of the second rotation block 1111 is greater than the width of the second opening 11121; when the bendable pipe section 1 is bent, the first rotation block 1109 rotates relative to the first rotation groove 1107, and the second rotation block 1111 rotates relative to the second rotation groove 1112. When the first rotation block 1109 of two adjacent mortise and tenon connectors 11 abuts against the edge of the first opening 11071 or the second rotation block 1111 abuts against the edge of the second opening 11121, the rotation of the two adjacent mortise and tenon connectors 11 stops. In one embodiment, the maximum width of the second rotation block 1111 is greater than the width of the second opening 11121, so the second rotation block 1111 can be embedded in the second rotation groove 1112 and rotate without detachment; the cross-sections of the first rotation groove 1107 and the second rotation groove 1112 are arc-shaped, the cross-sections of the first rotation block 1109 and the second rotation block 1111 are arc-shaped, and the cross-section of the first rotation block 1109 is adapted to the cross-section of the first rotation groove 1107, and the second rotation groove 1112 is adapted to the cross-section of the second rotation groove 1112. Therefore, while the first rotation block 1109 rotates in the first rotation groove 1107, the second rotation block 1111 can rotate in the second rotation groove 1112; the second stopper 1110 is used to limit the rotation angle between the two mortise and tenon connectors 11.

[0044] In one embodiment, as Figure 4 and Figure 5As shown, the mortise and tenon connector 11 further includes a third stopper 1113 connected to the inner side wall of the second rotation groove 1112, and a third rotation block 1114 connected to the third stopper 1113 and located in the second rotation groove 1112; a third rotation groove 1115 is provided on the second rotation block 1111, and a third opening 11151 for the third stopper 1113 of an adjacent mortise and tenon connector 11 to pass through is provided on the third rotation groove 1115; the third rotation groove 1115 is used to accommodate the third rotation block 1114 of an adjacent mortise and tenon connector 11; the maximum width of the third rotation block 1114 is greater than the width of the third opening 11151; when the bendable pipe section 1 is bent, the first rotation block 1109 rotates relative to the first rotation groove 1107, the second rotation block 1111 rotates relative to the second rotation groove 1112, and the third rotation block 1114 rotates relative to the third rotation groove 1115. When the edge of the first rotation block 1109 of two adjacent mortise and tenon connectors 11 abuts against the edge of the first opening 11071, the edge of the second rotation block 1111 abuts against the edge of the second opening 11121, or the edge of the third rotation block 1114 abuts against the edge of the third opening 11151, the rotation of two adjacent mortise and tenon connectors 11 stops. In one embodiment, the maximum width of the third rotation block 1114 is greater than the width of the third opening 11151, so the third rotation block 1114 can be embedded in the third rotation groove 1115 and rotate without detachment; the cross-section of the third rotation groove 1115 is circular, and the cross-section of the third rotation block 1114 is circular and adapted to the cross-section of the third rotation groove 1115. Therefore, while the first rotation block 1109 rotates in the first rotation groove 1107, the second rotation block 1111 rotates in the second rotation groove 1112, and the third rotation block 1114 rotates in the third rotation groove 1115; the third stopper 1113 is used to limit the rotation angle between the two mortise and tenon connectors 11.

[0045] In one embodiment, as Figure 4 and Figure 5 shown, the opening directions of the third opening 11151 and the second opening 11121 are set at a preset angle. It can be understood that the preset angle between the opening directions of the third opening 11151 and the second opening 11121 is 0 to 180 degrees. Preferably, the preset angle between the opening directions of the third opening 11151 and the second opening 11121 is 90 degrees.

[0046] In the embodiments of the present invention, by providing at least two mortise and tenon connectors 11 that are inserted into each other, and the mortise and tenon connector 11 is a mortise and tenon structure with circular concave and convex combination, the bending angle of the bendable pipe section 1 is increased, so that the sheath opening of the bendable guiding sheath can approach the direction of the stone in the kidney more conveniently.

[0047] In one embodiment, as Figure 6 and Figure 7 shown, the mortise and tenon connector 11 further includes a first card slot 1116 and a second card slot 1117 respectively arranged on opposite sides of the second stop block 1110; opposite sides of the second opening 11121 are respectively provided with a first buckle 1118 adapted to the first card slot 1116 and a second buckle 1119 adapted to the second card slot 1117; when the bendable pipe section 1 is bent, the first rotating block 1109 rotates relative to the first rotating slot 1107, and the second rotating block 1111 rotates relative to the second rotating slot 1112; when the edges of the second stop block 1110 and the second opening 11121 of two adjacent mortise and tenon connectors 11 are in contact, the rotation of the two adjacent mortise and tenon connectors 11 stops; when the first buckle 1118 is engaged with the first card slot 1116 or the second buckle 1119 is engaged with the second card slot 1117, the relative rotation position between two adjacent mortise and tenon connectors 11 is fixed. In one embodiment, the first buckle 1118 and the second buckle 1119 are made of soft materials, and the first card slot 1116 and the second card slot 1117 are made of hard materials. Therefore, the first buckle 1118 and the second buckle 1119 can be embedded into each other with the first card slot 1116 and the second card slot 1117 and separated from each other under a certain acting force. It can be understood that the first buckle 1118 and the second buckle 1119 can also be made of hard and / or soft materials, and the first card slot 1116 and the second card slot 1117 can also be made of soft and / or hard materials, as long as the first buckle 1118 can be embedded into the first card slot 1116 and separated from each other under a certain acting force, and the second buckle 1119 can be embedded into the second card slot 1117 and separated from each other under a certain acting force. In one embodiment, the first card slot 1116 and the second card slot 1117 can also be arranged on opposite sides of the third stop block 1113. At the same time, the first buckle 1118 and the second buckle 1119 can also be arranged on opposite sides of the third opening 11151. It can be understood that the first card slot 1116 and the second card slot 1117 and their corresponding first buckle 1118 and second buckle 1119 can be respectively arranged on the abutting surfaces of two adjacent mortise and tenon connectors 11, as long as the relative rotation between two adjacent mortise and tenon connectors 11 can be fixed at a predetermined rotation position.

[0048] In the embodiment of the present invention, by providing a slot (such as a first slot 1116 and a second slot 1117) and a buckle (such as a first buckle 1118 and a second buckle 1119) on the circular concave-convex joint connector 11, when the bendable tube section 1 is bent to a preset angle, the bendable tube section 1 is brought into a fixed angle state through the engagement of the slot and the buckle. After the soft mirror in the bendable guide sheath is withdrawn, the bendable tube section 1 remains in the fixed angle state, thereby facilitating the next step of negative pressure suction lithotripsy. If the locked state needs to be released, the soft mirror is used to bend in the reverse direction to drive the bendable tube section 1 to bend in the opposite direction, the slot and the buckle are released, and the bendable tube section 1 is released from the fixed angle state.

[0049] like Figure 8 As shown, an embodiment of the present invention further provides a guiding device, comprising a dilator 4 and the above-mentioned bendable guiding sheath, wherein the dilator 4 passes through the bendable guiding sheath and is connected to the sheath connector 3. Specifically, the dilator 4 passes through the bendable tube section 1, the middle tube section 2 and the sheath connector 3 of the bendable guiding sheath in sequence, and is connected to the sheath connector 3.

[0050] In an embodiment of the present invention, the guiding device comprises a flexible guiding sheath and a dilator 4 which passes through the flexible guiding sheath and is connected to a sheath joint 3 of the flexible guiding sheath. The flexible guiding sheath is divided into three parts: a flexible tube section 1, an intermediate tube section 2 and a sheath joint 3. By setting the flexible tube section 1 to have at least two mortise and tenon connectors 11 which are sequentially plugged in along the axial direction of the intermediate tube section 2, the guiding device can be bent into a desired shape, so that the guiding device can approach the stone fragments in the kidney through the flexible tube section 1, and then flush the stone fragments out of the guiding device through the water flow injected during the operation. In this way, the discharge efficiency of the stone fragments is improved, and the occurrence of situations that affect the surgical efficiency, such as the stone powder affecting the field of vision or accumulating in the kidney, is avoided. The uncertainty of natural stone discharge can also be avoided, thereby improving stone removal.

[0051] The above are merely embodiments of the bendable guide sheath and guide device of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bendable guiding sheath tube, characterized in that, It includes a bendable pipe section, an intermediate pipe section, and a sheath joint. The intermediate pipe section is connected between the bendable pipe section and the sheath joint. The bendable pipe section includes at least two mortise-and-tenon connectors, and each of the mortise-and-tenon connectors is sequentially inserted along the axial direction of the intermediate pipe section. The bendable pipe section is configured to axially bend relative to the intermediate pipe section through the relative sliding between the mortise-and-tenon connectors when subjected to a lateral force. The mortise-and-tenon connector includes a second body, a first rotation groove provided on the first side of the second body, a first stop block connected to the second side of the second body, and a first rotation block connected to the second side of the first stop block. The first rotation groove is provided with a first opening for the first stop block of an adjacent mortise-and-tenon connector to pass through, and the first rotation groove is configured to accommodate the first rotation block of an adjacent mortise-and-tenon connector. The maximum width of the first rotation block is greater than the width of the first opening. When the bendable pipe section bends, the first rotation block rotates relative to the first rotation groove, and when the first rotation blocks of two adjacent mortise-and-tenon connectors are abutted against the edge of the first opening, the two adjacent mortise-and-tenon connectors stop rotating. The bendable pipe section further includes an elastic material layer covering the surface of the mortise-and-tenon connectors.

2. The bendable guiding sheath according to claim 1, wherein, The mortise-and-tenon connector further includes a second stop block connected to the inner side wall of the first rotation groove and a second rotation block connected to the first side of the second stop block and located in the first rotation groove. The first rotation block is provided with a second rotation groove, and the second rotation groove is provided with a second opening that is arranged away from the first opening and for the second stop block of an adjacent mortise-and-tenon connector to pass through. The second rotation groove is configured to accommodate the second rotation block of an adjacent mortise-and-tenon connector. The maximum width of the second rotation block is greater than the width of the second opening. When the bendable pipe section bends, the first rotation block rotates relative to the first rotation groove, and the second rotation block rotates relative to the second rotation groove. When the first rotation block of two adjacent mortise-and-tenon connectors abuts against the edge of the first opening or the second rotation block abuts against the edge of the second opening, the two adjacent mortise-and-tenon connectors stop rotating.

3. The bendable guiding sheath according to claim 2, wherein The mortise-and-tenon connector further includes a third stop block connected to the inner side wall of the second rotation groove and a third rotation block connected to the third stop block and located in the second rotation groove. The second rotation block is provided with a third rotation groove, and the third rotation groove is provided with a third opening for the third stop block of an adjacent mortise-and-tenon connector to pass through. The third rotation groove is configured to accommodate the third rotation block of an adjacent mortise-and-tenon connector. The maximum width of the third rotation block is greater than the width of the third opening. When the bendable pipe section is bent, the first rotating block rotates relative to the first rotating groove, the second rotating block rotates relative to the second rotating groove, and the third rotating block rotates relative to the third rotating groove. When the first rotating block of two adjacent tenon-and-mortise connectors abuts against the edge of the first opening, the second rotating block abuts against the edge of the second opening, or the third rotating block abuts against the edge of the third opening, the rotation of two adjacent tenon-and-mortise connectors stops.

4. The bendable guiding sheath according to claim 3, characterized in that, The opening direction of the third opening is set at a preset angle with respect to the opening direction of the second opening.

5. The bendable guiding sheath according to any one of claims 2-4, characterized in that, The tenon-and-mortise connector further includes a first card slot and a second card slot respectively arranged on opposite sides of the second stop block; on opposite sides of the second opening, there are respectively arranged a first buckle adapted to the first card slot and a second buckle adapted to the second card slot; When the bendable pipe section is bent, the first rotating block rotates relative to the first rotating groove, and the second rotating block rotates relative to the second rotating groove; When the second stop block of two adjacent tenon-and-mortise connectors abuts against the edge of the second opening, the rotation of two adjacent tenon-and-mortise connectors stops; when the first buckle is engaged with the first card slot or the second buckle is engaged with the second card slot, the relative rotational position between two adjacent tenon-and-mortise connectors is fixed.

6. A guiding device, characterized in that, It includes a dilator and a bendable guiding sheath tube according to any one of claims 1 to 5, and the dilator passes through the bendable guiding sheath tube and is connected to the sheath tube joint.

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