Guide sheath and sheath tube assembly

Abstract

The invention discloses a guiding sheath and a sheathing canal assembly, and relates to the technical field of medical instruments, the guiding sheath comprises a sheathing canal main body and an elastic limiting piece, the elastic limiting piece is arranged on the sheathing canal main body and is used for abutting against an insertion part inserted into the sheathing canal main body so as to elastically restrain the insertion part on one side of the inner wall of the sheathing canal main body. The sheath tube main body of the guide sheath can be placed in the body of a patient, the insertion part of the endoscope extends into the sheath tube main body, and the insertion part can be elastically restrained on one side of the inner wall of the sheath tube main body by the elastic limiting piece. For example, after the calculus is broken, a negative pressure environment can be provided in the sheathing canal, so that the calculus is sucked between the inner wall of the sheathing canal main body and the insertion part and is discharged. During the period, the insertion part is elastically restrained on one side of the inner wall by the elastic limiting piece, a large space is reserved for the other side of the inner wall, and the situation that the object to be sucked is blocked is prevented. During the period, the elastic limiting piece with elasticity can deform so as to adapt to the insertion parts of different specifications and play a limiting role on the insertion parts.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a guide sheath and a sheath tube assembly. Background Art

[0002] Guide sheaths and endoscopes are high-precision medical devices specially designed and widely used in the field of urinary system inspection and treatment. As an auxiliary tool, the guide sheath is usually used to guide the endoscope or other medical devices into the urinary system to ensure the accuracy and safety of the operation. Its design fully considers the physiological structure of the human urinary system, can effectively reduce trauma and complications during surgery, and improve the success rate of surgery and the speed of patient recovery.

[0003] When using a guide sheath and an endoscope 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 can be inserted into the sheath to observe and break the stones. After the stones are broken, the sheath can be used to provide a negative pressure environment to suck the stones into the gap between the sheath and the insertion portion, thereby expelling the stones. However, the position of the insertion portion in the sheath is uncertain, and the insertion portion will prevent the stones from passing through the gap, which can easily lead to problems with unsmooth stone removal. Summary of the invention

[0004] In view of the above shortcomings of the related technologies, the present application provides a guide sheath and sheath tube assembly to solve the above technical problems.

[0005] The present application provides a guide sheath, including a sheath body and an elastic limiter. The sheath body is used to accommodate at least part of an insertion portion of an endoscope. The elastic limiter is arranged on the sheath body and is used to abut the insertion portion inserted into the sheath body to elastically constrain the insertion portion to one side of the inner wall of the sheath body.

[0006] In one embodiment of the present application, the elastic limiter includes an abutment portion, a fixing portion and an elastic portion, the fixing portion is connected to the inner wall of the sheath body, one end of the elastic portion is connected to the fixing portion, and the other end extends along the axis of the sheath body and is connected to the abutment portion.

[0007] In one embodiment of the present application, a surface of the abutment portion away from the distal end of the sheath body is configured as a curved surface.

[0008] In one embodiment of the present application, the sheath body has a through hole for the insertion portion to extend out, and both ends of the elastic limiter are connected to the sheath body and divide the through hole into a first part and a second part.

[0009] In one embodiment of the present application, the elastic stopper is configured as a strip, and a surface of the elastic stopper close to the distal end of the sheath body is inclined relative to the axis of the sheath body.

[0010] In one embodiment of the present application, the elastic limiter includes a trigger mechanism, a transmission mechanism and a force-applying mechanism. The trigger mechanism is arranged at the distal end of the sheath body, and the transmission mechanism is connected between the force-applying mechanism and the transmission mechanism. When the trigger mechanism is triggered, the force-applying mechanism is driven and elastically constrains the insertion part inserted into the sheath body.

[0011] In one embodiment of the present application, the trigger mechanism includes an elastic sleeve, at least a portion of which is sleeved on the distal end of the sheath body, and a hole diameter of the elastic sleeve is smaller than an outer diameter of the insertion portion.

[0012] In one embodiment of the present application, the force-applying mechanism includes an elastic sleeve, the transmission mechanism includes a connecting rope, the elastic sleeve is sleeved on the sheath body, and the elastic sleeve includes a driven part and a connecting part that are connected to each other, the connecting part is connected to the outer wall of the sheath body, one end of the connecting rope is connected to the trigger mechanism, and the other end is wrapped around the driven part and connected to the distal end of the sheath body.

[0013] In one embodiment of the present application, a slide groove extending along the axial direction of the sheath body is opened at the distal end of the sheath body, and a slider is provided at the end of the connecting rope away from the trigger mechanism. The slider is slidably engaged with the slide groove, and when the elastic ring sleeve elastically constrains the insertion part, the slider and the slide groove are released.

[0014] In one embodiment of the present application, the distal end of the sheath body is configured as an inclined surface, and the thickness of the inclined surface gradually decreases along the direction from the driven portion to the connecting portion.

[0015] To achieve the above objectives and other related objectives, the present application provides a sheath assembly, including the aforementioned guide sheath and dilator.

[0016] The technical solution adopted by the present invention can achieve the following beneficial effects: the sheath body of the guide sheath can be placed in the patient's body, the insertion part of the endoscope extends into the sheath body, and the insertion part can be elastically constrained by an elastic limiter to one side of the inner wall of the sheath body. For example, after the stone is broken, a negative pressure environment can be provided in the sheath to suck the stone between the inner wall of the sheath body and the insertion part and expel it. During this period, the insertion part is elastically constrained by the elastic limiter to one side of the inner wall, leaving a larger space for the other side to prevent blockage by the object to be sucked, thereby improving the working efficiency of the guide sheath. During this period, the elastic limiter can be deformed to adapt to insertion parts of different specifications and have a limiting effect on them. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic structural diagram of a guide sheath and an insertion portion shown in an exemplary embodiment of the present application; Figure 2 is a schematic structural diagram of a guide sheath and an insertion portion from another perspective shown in an exemplary embodiment of the present application; Figure 3 is a cross-sectional view of an introducer sheath and an insertion portion shown in an exemplary embodiment of the present application; Figure 4 is a schematic structural diagram of a guide sheath and an insertion portion from yet another perspective, shown in an exemplary embodiment of the present application; Figure 5 yes Figure 3 The enlarged view of point a in the figure; Figure 6 is a schematic structural diagram of a guide sheath and an insertion portion shown in another exemplary embodiment of the present application; Figure 7 is a cross-sectional view of an introducer sheath and an insertion portion shown in another exemplary embodiment of the present application; Figure 8 is a structural schematic diagram of a guide sheath and an insertion portion shown in yet another exemplary embodiment of the present application; Fig. 9 is a schematic structural diagram of a guide sheath and an insertion portion from another perspective shown in yet another exemplary embodiment of the present application; Fig.10 is a schematic structural diagram showing a guide sheath and a dilator according to another exemplary embodiment of the present application; Fig.11 is a schematic structural diagram of a guide sheath and an insertion portion from another perspective shown in yet another exemplary embodiment of the present application; Fig.12 yes Figure 8 The enlarged view of point b in the figure; Fig.13 is a cross-sectional view of a guide sheath and an insertion portion shown in yet another exemplary embodiment of the present application; Fig.14 yes Fig.13 The enlarged view of point c in the figure; Fig.15 It is a schematic structural diagram of a sheath tube assembly shown in an exemplary embodiment of the present application.

[0019] In the figure: 1, sheath assembly; 100, guide sheath; 110, sheath body; 111, through hole; 112, sheath inclined surface; 113, first part; 114, second part; 115, slide groove; 120, elastic limiter; 121, abutment part; 122, fixing part; 123, elastic part; 124, trigger mechanism; 125, transmission mechanism; 126, force-applying mechanism; 1261, driven part; 1262, connecting part; 127, slider; 200, insertion part; 300, dilator. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0021] The terms "first", "second", etc. in the specification and claims of this 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.

[0022] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of each component 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".

[0023] Guide sheaths and endoscopes are high-precision medical devices specially designed and widely used in the field of urinary system inspection and treatment. As an auxiliary tool, the guide sheath is usually used to guide the endoscope or other medical devices into the urinary system to ensure the accuracy and safety of the operation. Its design fully considers the physiological structure of the human urinary system, can effectively reduce trauma and complications during surgery, and improve the success rate of surgery and the speed of patient recovery.

[0024] When using a guide sheath and an endoscope 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 can be inserted into the sheath to observe and break the stones. After the stones are broken, the sheath can be used to provide a negative pressure environment to suck the stones into the gap between the sheath and the insertion portion, thereby expelling the stones. However, the position of the insertion portion in the sheath is uncertain, and the insertion portion will prevent the stones from passing through the gap, which can easily lead to problems with unsmooth stone removal.

[0025] The present application provides a guide sheath 100, see Figure 1 The guide sheath 100 may include a sheath body 110 and an elastic limiting member 120 , and the elastic limiting member 120 is disposed on the sheath body 110 .

[0026] The sheath body 110 is used to accommodate at least part of the insertion portion 200 of the endoscope, and the sheath can serve as a passage for the endoscope and other instruments to enter and exit the human incision. For example, during surgery, the doctor inserts the endoscope into the human incision through the sheath, and the endoscope can smoothly enter the affected area through the sheath, helping the doctor to observe and diagnose in real time, and also avoiding the endoscope being inserted into the affected area multiple times during surgery, causing other injuries.

[0027] In one embodiment, see Figure 1 The sheath body 110 has a through hole 111 for the insertion part 200 to extend out. The insertion part 200 can extend out of the sheath body 110 through the through hole 111, so that the insertion part 200 can enter a narrower area, thereby improving the application environment of the guide sheath 100.

[0028] It is understandable that the endoscope here can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, an enteroscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc., and the embodiment of the present application does not specifically limit the type of endoscope. The insertion portion 200 can be the part of the endoscope used to insert into the object to be detected (such as a human cavity), and the insertion portion 200 can include key components such as a lens, an illuminating device, and an instrument tube, which will not be described in detail here.

[0029] The position of the insertion part 200 in the sheath body 110 is uncertain. For example, at least part of the insertion part 200 located in the sheath body 110 may be coaxial with the sheath, which will obviously result in a smaller gap between the insertion part 200 and the sheath body 110, resulting in poor stone removal. Figure 2 as well as Figure 3 , Figure 2 is a schematic diagram of the structure when the elastic limiting member 120 is in contact with the inserting portion 200, Figure 3The schematic diagram of the structure of the elastic limiter 120 elastically constraining the insertion part 200. The elastic limiter 120 can be arranged in the sheath body 110, and the elastic limiter 120 is used to abut the insertion part 200 inserted in the sheath body 110, so as to elastically constrain the insertion part 200 to one side of the inner wall of the sheath body 110. The insertion part 200 is biased in the sheath body 110. In other words, the insertion part 200 is not in the middle of the sheath body 110, which can make the sheath located on one side of the inner wall of the sheath body 110, and the other side of the insertion part 200 has a larger space, which can be a flow space for the object to be sucked, such as crushed stones, etc., so as to achieve the purpose of anti-blockage. This setting can ensure that the insertion part 200 is relatively fixed in the sheath body 110, and can also ensure that the insertion part 200 is biased in the sheath, and a larger size is reserved for the flow space to prevent blockage.

[0030] It is understandable that the elastic limiter 120 is elastic and has good deformation ability. For example, the material of the elastic limiter 120 can be stainless steel, silicone rubber, polyurethane, etc., which is not limited here. Depending on the purpose of implementation, the endoscope can also be configured to different specifications. The elastic limiter 120 can be deformed to adjust the space size between the elastic limiter 120 and the inner wall of the sheath body 110 to adapt to different endoscopes. In other words, for endoscopes of any specifications, the elastic limiter 120 can play the above-mentioned role of preventing blockage and limiting.

[0031] In one embodiment, see Figure 1 as well as Figure 4 The two ends of the elastic stopper 120 are connected to the sheath body 110, and the through hole 111 of the sheath body 110 is divided into a first part 113 and a second part 114. According to the specifications of the insertion part 200 and the sheath, the size of the elastic stopper 120, etc., the area ratio between the first part 113 and the second part 114 is selected or designed. For example, the area ratio between the first part 113 and the second part 114 can be 1:1, 1:2 or 2:1, etc., which is not limited here. For example, Figure 5 As shown, the insertion part 200 is inserted into the first part 113 in the through hole 111, and the elastic limiter 120 can limit the insertion part 200 in the first part 113. The second part 114 can be used for the passage of the object to be sucked. This arrangement can ensure that the insertion part 200 is biased in the sheath tube, and a larger size is reserved for the second part 114 to prevent blockage.

[0032] See also Figure 5The elastic stopper 120 is configured as a strip, and the surface of the elastic stopper 120 close to the distal end of the sheath body 110 is inclined relative to the axis of the sheath body 110. The inclined elastic stopper 120 can play a certain guiding role. In other words, the elastic stopper 120 has an inclined surface inclined relative to the axis of the sheath body 110. The insertion part 200 abuts against the inclined surface, and the inclined surface can guide the insertion part 200 to move toward the first part 113. The second part 114 can reserve a larger size to prevent blockage.

[0033] Exemplarily, the distal end of the sheath body 110 is configured as a slope, and the slope of the sheath body 110 is inclined relative to the axis of the sheath body 110. The opposite ends of the elastic limiter 120 are arranged on the sheath slope 112, and then the strip-shaped elastic limiter 120 is also inclined accordingly to play the above-mentioned guiding role.

[0034] In another embodiment, see Figure 6 as well as Figure 7 The elastic stopper 120 may include an abutment portion 121, a fixing portion 122 and an elastic portion 123, wherein the elastic portion 123 is connected between the abutment portion 121 and the fixing portion 122, and the fixing portion 122 is connected to the inner wall of the sheath body 110. For example, the elastic stopper 120 may be made of stainless steel, which has excellent elasticity, corrosion resistance, and wear resistance. The elastic portion 123 has deformation capability, one end of the elastic portion 123 is connected to the fixing portion 122, and the other end extends along the axis of the sheath body 110 and is connected to the abutment portion 121. Exemplarily, the abutment portion 121 abuts against the insertion portion 200, and the insertion portion 200 may move toward the elastic stopper 120, and the elastic portion 123 will be deformed. The deformed elastic portion 123 will hinder the movement of the insertion portion 200 and push the insertion portion 200 away from itself, so as to realize the limiting function of the elastic stopper 120.

[0035] For more details, please refer to Figure 7 The fixing portion 122 can be configured as an annular structure, and the annular structure is adapted to the sheath body 110 and the insertion portion 200. For example, the outer diameter of the fixing portion 122 is less than or equal to the inner diameter of the sheath body 110, and the inner diameter of the fixing portion 122 is greater than the outer diameter of the insertion portion 200. The insertion portion 200 can pass through the fixing portion 122 and be inserted out of the sheath body 110. The fixing portion 122 can be relatively fixed in the sheath body 110, and this arrangement can increase the contact area between the fixing portion 122 and the sheath body 110, thereby improving the fixing effect of the elastic limiter 120.

[0036] The abutting portion 121 , the fixing portion 122 and the elastic portion 123 may be formed in one piece, thereby improving the structural strength and reliability of the elastic limiting member 120 .

[0037] Preferably, if Figure 7 As shown, the surface of the abutment portion 121 away from the distal end of the sheath body 110 is configured as a curved surface, and the curved surface design can significantly reduce the friction and resistance between the abutment portion 121 and the insertion portion 200. In addition, the curved surface plays a guiding role when the insertion portion 200 is inserted into the sheath body 110, so as to ensure that the insertion portion 200 is biased in the sheath, and a larger size is reserved for the flow space to prevent blockage.

[0038] In another embodiment, see Figure 8 The elastic stopper 120 may include a trigger mechanism 124, a transmission mechanism 125 and a force mechanism 126. The trigger mechanism 124 is arranged at the distal end of the sheath body 110, and the transmission mechanism 125 is connected between the force mechanism 126 and the transmission mechanism 125. The trigger mechanism 124 may be triggered by the insertion part 200 or other structures, and the triggering method includes but is not limited to the rotation, bending or abutment of the insertion part 200. When the trigger mechanism 124 is triggered, the force mechanism 126 is driven and elastically constrains the insertion part 200 inserted into the sheath body 110. The force mechanism 126 limits or constrains the movement of the insertion part 200 so that it does not produce unnecessary deviation. During this period, the setting of the trigger mechanism 124 can enable the force mechanism 126 to have a targeted restriction on the insertion part 200. When the trigger mechanism 124 is not triggered, the force mechanism 126 does not affect the normal operation of the sheath body 110 or other components, thereby improving the elastic constraint effect of the elastic stopper 120.

[0039] More specifically, see Fig. 9 The trigger mechanism 124 may include an elastic sleeve, wherein the material of the elastic sleeve may be silicone or polyurethane. The elastic sleeve has elasticity, and at least part of the elastic sleeve is sleeved on the distal end of the sheath body 110. The elastic sleeve can be sleeved on the sheath body 110, and there is a certain friction between the two, and the friction can prevent the elastic sleeve from easily detaching from the sheath body 110. The insertion part 200 is inserted into the sheath body 110 until it extends to the distal end of the sheath body 110. The aperture of the elastic sleeve is smaller than the outer diameter of the insertion part 200, and the insertion part 200 can drive the elastic sleeve to move, and the elastic sleeve slides relative to the sheath body 110, and then the force-applying mechanism 126 responds to the elastic sleeve, and the force-applying mechanism 126 elastically constrains the insertion part 200 inserted into the sheath body 110. This setting can trigger the trigger mechanism 124 more easily, reducing the difficulty of triggering the mechanism 124.

[0040] In order to ensure that the trigger mechanism 124 can be accurately triggered, the elastic sleeve can be configured as a conical structure. The large-diameter end of the elastic sleeve can be easily sleeved on the outer surface of the sheath body 110, and the small-diameter end of the elastic sleeve can extend out of the distal end of the sheath body 110, and the aperture of the end is smaller than the outer diameter of the insertion part 200, so that the insertion part 200 can be inserted and sleeved with each other. In addition, the elastic sleeve with elasticity can adapt to different specifications of the insertion part 200, thereby improving the reliability of the elastic limiter 120.

[0041] It is understandable that if Fig.10 As shown, when inserted into the human body, the sheath body 110 needs to be used in conjunction with the dilator 300. The dilator 300 is a slender and gradually tapering instrument, which can gradually expand the passage from the skin to the lumen and reduce the resistance when the sheath enters. The elastic sleeve can be simultaneously sleeved on at least part of the dilator 300. This arrangement allows one end of the elastic sleeve to extend out of the distal end of the sheath body 110 after the dilator 300 and the sheath body 110 are separated, ensuring that the trigger mechanism 124 can be accurately triggered. In addition, the elastic sleeve can improve the connection effect between the dilator 300 and the sheath body 110 when the guide sheath 100 is inserted into the human body. The elastic sleeve has a certain elasticity, and it will not hinder the separation between the dilator 300 and the sheath body 110.

[0042] In addition, see Figure 8 as well as Fig.11 , the force-applying mechanism 126 may include an elastic sleeve, which is sleeved on the sheath body 110, and the elastic sleeve includes a driven portion 1261 and a connecting portion 1262 connected to each other, and the connecting portion 1262 is connected to the outer wall of the sheath body 110. In other words, part of the force-applying mechanism 126 is connected to the sheath body 110, and the remaining part can be movably arranged relative to the sheath body 110. Exemplarily, the transmission mechanism 125 can be connected to the driven portion 1261, the trigger mechanism 124 is triggered and drives the transmission mechanism 125 to move, and the driven portion 1261 and the transmission mechanism 125 move together until the distal end of the sheath body 110. At this time, there is no restriction on the outer wall of the sheath body 110, and the driven portion 1261 can shrink toward the connecting portion 1262 to restore at least part of the elastic sleeve to its original state. Furthermore, the elastic limiting insertion portion 200 of the elastic sleeve moves toward the direction close to the connecting portion 1262, and a larger size is reserved for the object to be sucked to prevent blockage.

[0043] Among them, this embodiment does not limit the area, shape, etc. of the connection surface between the elastic sleeve and the sheath body 110, that is, it does not limit the volume proportion of the connection part 1262 and the driven part 1261 in the elastic sleeve. Exemplarily, the elastic sleeve and the sheath body 110 can be spot welded by ultrasound, that is, the connection part 1262 is only one point, so that the driven part 1261 has a sufficiently large deformation amount, thereby improving the adaptability of the elastic sleeve.

[0044] Please continue reading Fig.11 The transmission mechanism 125 may include a connecting rope, and the connecting rope may be a medical suture, etc., which has good versatility and meets medical standards. One end of the connecting rope is connected to the trigger mechanism 124, and the other end is wound around the driven part 1261 and connected to the distal end of the sheath body 110. The connecting rope drives the driven part 1261 to move toward the distal end of the sheath body 110, and the connecting ropes on both sides of the driven part 1261 move at the same time. The moving distance of the connecting rope is greater than the moving distance of the driven part 1261, thereby increasing the moving path of the driven part 1261, improving the trigger stroke of the trigger mechanism 124, and effectively preventing the phenomenon of accidental touch.

[0045] Preferably, the driven portion 1261 is provided with a connection groove, which can be provided on a side of the driven portion 1261 close to the sheath body 110. The connection groove is used to accommodate the connection rope, so that the connection rope can have a clearer orientation and extension direction, ensuring that the connection rope does not slide or deflect during the transmission process, thereby improving the transmission effect of the transmission mechanism 125.

[0046] Please also read Fig.12 as well as Fig.13 The distal end of the sheath body 110 is provided with a slide groove 115 extending along the axial direction of the sheath body 110, and one end of the slide groove 115 extends to the distal end of the sheath body 110. Fig.14 As shown, a slider 127 is provided at one end of the connecting rope away from the trigger mechanism 124, and the slider 127 is slidably matched with the slide groove 115. As the connecting rope is pulled, the elastic ring sleeve slides toward the distal end of the sheath tube, and the slider 127 can slide along the slide groove 115. When the elastic ring sleeve elastically constrains the insertion part 200, the slider 127 and the slide groove 115 are released. In other words, the driven part 1261 moves to the distal end of the sheath tube body 110 and elastically constrains the insertion part 200. The cooperation between the slider 127 and the slide groove 115 is released, and the connection between the connecting rope and the sheath tube body 110 is synchronously released, so as to avoid the connecting rope from restricting the movement of the insertion part 200 in the subsequent process and increase the range of movement of the insertion part 200.

[0047] The extended length of the slide groove 115 is less than or equal to the distance from the driven portion 1261 to the distal end of the sheath body 110. This arrangement can prevent the slide groove 115 from being too long, affecting the normal sliding of the driven portion 1261, and ensure that the slider 127 can be released from the slide groove 115.

[0048] It is understandable that the extension direction of the connecting rope between the driven portion 1261 and the slider 127, and the extension direction of the connecting rope between the driven portion 1261 and the trigger mechanism 124 are both the axial direction of the sheath body 110. The insertion direction of the insertion portion 200 is roughly parallel or colinear with the axial direction of the sheath body 110, that is, the force direction of the insertion portion 200 on the trigger mechanism 124 is also the axial direction of the sheath body 110. This setting can ensure that the extension direction of the connecting rope remains unchanged before and after transmission, avoids relative sliding of the connecting rope during the triggering process, and affects the normal triggering of the elastic limiter 120, and improves the reliability of the elastic limiter 120.

[0049] Under the action of external force, the elastic ring may still be re-sheathed outside the sheath body 110, thereby losing its limiting function. Fig.11 As shown, the distal end of the sheath body 110 of the present embodiment is configured as an inclined surface. In order to distinguish it from the inclined surface of the elastic limiter 120, the inclined surface of the sheath body 110 is referred to as the sheath inclined surface 112 in the following content. The thickness of the sheath inclined surface 112 gradually decreases in the direction from the driven portion 1261 to the connecting portion 1262. When the distal end of the sheath body 110 presents an inclined surface, the elastic ring sleeve will encounter greater resistance when crossing the sheath inclined surface 112. The elastic ring sleeve needs to overcome greater deformation to continue moving forward. The sheath inclined surface 112 not only enhances the connection stability between the sheath body 110 and the elastic ring sleeve, but also ensures that the elastic ring sleeve will not be displaced due to unexpected factors during use.

[0050] In order to achieve the above-mentioned purpose and other related purposes, the present application provides a sheath tube assembly 1, see Fig.15 The sheath assembly 1 may include the aforementioned guide sheath 100 and dilator 300. In this way, the sheath assembly 1 has the beneficial effects of any of the aforementioned solutions, which will not be described in detail here.

[0051] The technical solution adopted by the present invention can achieve the following beneficial effects: the sheath body 110 of the guide sheath 100 can be placed in the patient's body, the insertion part 200 of the endoscope extends into the sheath body 110, and the insertion part 200 can be elastically constrained by the elastic limiter 120 to one side of the inner wall of the sheath body 110. For example, after the stone is broken, the negative pressure environment provided in the sheath can be used to suck the stone between the inner wall of the sheath body 110 and the insertion part 200 and be discharged. During this period, the insertion part 200 is elastically constrained by the elastic limiter 120 to one side of the inner wall, leaving a large space for the other side, preventing the blockage of the object to be sucked, and improving the working efficiency of the guide sheath 100. During this period, the elastic limiter 120 with elasticity can be deformed to adapt to the insertion part 200 of different specifications and produce a limiting effect on it.

[0052] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0053] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0054] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A guide sheath, characterized in that: include: a sheath body for accommodating at least a portion of an insertion portion of an endoscope; as well as, An elastic limiting member is arranged on the sheath tube body and is used to abut against the insertion portion inserted into the sheath tube body so as to elastically constrain the insertion portion to one side of the inner wall of the sheath tube body.

2. The guide sheath according to claim 1, characterized in that: The elastic limiting member includes an abutment portion, a fixing portion and an elastic portion, wherein the fixing portion is connected to the inner wall of the sheath body, one end of the elastic portion is connected to the fixing portion, and the other end extends along the axis of the sheath body and is connected to the abutment portion.

3. The guide sheath according to claim 2, characterized in that: A surface of the abutment portion that is away from the distal end of the sheath tube body is configured as a curved surface.

4. The guide sheath according to claim 1, characterized in that: The sheath tube body has a through hole for the insertion portion to extend out, and both ends of the elastic stopper are connected to the sheath tube body and divide the through hole into a first part and a second part.

5. The guide sheath according to claim 4, characterized in that: The elastic stopper is configured in a strip shape, and a surface of the elastic stopper close to the distal end of the sheath tube body is inclined relative to the axis of the sheath tube body.

6. The guide sheath according to claim 1, characterized in that: The elastic limiter includes a trigger mechanism, a transmission mechanism and a force-applying mechanism. The trigger mechanism is arranged at the distal end of the sheath body, and the transmission mechanism is connected between the force-applying mechanism and the transmission mechanism. When the trigger mechanism is triggered, the force-applying mechanism is driven and elastically constrains the insertion part inserted into the sheath body.

7. The guide sheath according to claim 6, characterized in that: The trigger mechanism comprises an elastic sleeve, at least a portion of which is sleeved on the distal end of the sheath body, and a hole diameter of the elastic sleeve is smaller than an outer diameter of the insertion portion.

8. The guide sheath according to claim 6 or 7, characterized in that: The force-applying mechanism includes an elastic ring sleeve, and the transmission mechanism includes a connecting rope. The elastic ring sleeve is sleeved on the sheath tube body, and the elastic ring sleeve includes a driven part and a connecting part that are connected to each other, and the connecting part is connected to the outer wall of the sheath tube body. One end of the connecting rope is connected to the trigger mechanism, and the other end is wrapped around the driven part and connected to the distal end of the sheath tube body.

9. The guide sheath according to claim 8, characterized in that: The distal end of the sheath body is provided with a slide groove extending along the axial direction of the sheath body, and the end of the connecting rope away from the trigger mechanism is provided with a slider, the slider is slidably matched with the slide groove, and when the elastic ring elastically constrains the insertion part, the slider and the slide groove are released; And / or, the distal end of the sheath body is configured as a slope, and the thickness of the slope gradually decreases along the direction from the driven part to the connecting part.

10. A sheath tube assembly, characterized in that: It comprises an introducer sheath and a dilator as described in any one of claims 1 to 9.

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