Sheath sealing cover and ureter sheath

Abstract

The utility model relates to the technical field of medical instruments, and discloses a sheath sealing cover and a ureter sheath. The sheath sealing cover is applied to the ureter sheath, and the sheath sealing cover comprises a deformation area and a rigidity area; the deformation area is provided with an axially-penetrating through hole, and when the instrument enters or leaves the through hole, the deformation area elastically deforms. The rigidity area is used for being connected with a sheath tube base of the ureter sheath and connected with the deformation area in a surrounding mode. In the elastic deformation process of the deformation area, the rigidity area is reliably matched with the sheath tube seat through the rigidity of the rigidity area. The ureter sheath includes a sheath sealing cap. According to the technical scheme, the technical problem that in the prior art, the sheath sealing cover of the ureter sheath is prone to being separated from the sheath tube base of the ureter sheath can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially, relates to a sheath seal cover and ureteral sheath. BACKGROUND

[0002] The ureteral sheath is used in urological operation, and the ureteral sheath is inserted into the ureter before the operation to establish a surgical channel, and during the operation, endoscopes, laser fibers, stone extraction instruments or operation cables are introduced through the surgical channel, and some blood clots, small stones and pus flocculus are also discharged from the ureteral sheath. However, the sheath seal cover for sealing the inserted instrument is easy to fall off from the sheath tube seat of the ureteral sheath during use, affecting the normal use of the ureteral sheath.

[0003] Therefore, it is a technical problem to be solved by those skilled in the art to provide a sheath seal cover and ureteral sheath, which are not easy to separate from the sheath tube seat of the ureteral sheath. SUMMARY

[0004] The utility model discloses a sheath seal cover and ureteral sheath to solve the technical problem that the sheath seal cover of the ureteral sheath in the prior art is easy to separate from the sheath tube seat of the ureteral sheath.

[0005] To solve the above problems, the utility model adopts the following technical scheme:

[0006] In the first aspect, a sheath seal cover is disclosed, which is applied to a ureteral sheath, and the sheath seal cover comprises a deformation zone and a stiffness zone.

[0007] The deformation zone has an axial through hole, and the deformation zone deforms elastically when the instrument enters or leaves the through hole.

[0008] The stiffness zone is used to connect with the sheath tube seat of the ureteral sheath and surround the deformation zone, and the stiffness zone maintains reliable cooperation with the sheath tube seat through its rigidity during the elastic deformation of the deformation zone.

[0009] In some schemes, the stiffness zone comprises a rigid structure formed by bending the corresponding area of the sheath seal cover.

[0010] And / or, the stiffness zone comprises a rigid structure formed by thickening the corresponding area of the sheath seal cover.

[0011] And / or, the stiffness zone comprises a rigid structure formed by reinforcing the corresponding area of the sheath seal cover.

[0012] And / or, the stiffness zone comprises a rigid structure formed by making the corresponding area of the sheath seal cover from a high-elasticity modulus material.

[0013] In some embodiments, the height position of the through hole is lower than the top surface of the sheath sealing cover in the axial direction of the sheath sealing cover.

[0014] In some embodiments, the stiffness region extends towards the bottom of the sheath sealing cover near one end of the axis and surrounds the deformation region, so that the height position of the through hole is lower than the top surface of the sheath sealing cover in the axial direction of the sheath sealing cover.

[0015] And / or, the stiffness region and the deformation region form a stepped structure, so that the height position of the through hole is lower than the top surface of the sheath sealing cover in the axial direction of the sheath sealing cover.

[0016] In some embodiments, the stiffness region includes a circumferential side wall of the sheath sealing cover and a connecting structure connecting the circumferential side wall and the deformation region.

[0017] The connecting structure is bent to define a floating cavity between the circumferential side wall.

[0018] In some embodiments, the floating cavity is provided with a plurality of reinforcing ribs spaced along the circumference thereof.

[0019] In some embodiments, the mating surface of the circumferential side wall and the sheath tube seat has an interference fit portion.

[0020] And / or, the circumferential side wall has a first limiting portion, and the sheath tube seat has a second limiting portion matched with the first limiting portion to realize the circumferential limiting of the sheath sealing cover and the sheath tube seat.

[0021] In some embodiments, the radius of the stiffness region is 1.5-3 times the radius of the deformation region.

[0022] In some embodiments, the through hole is located at the center of the deformation region; the axis of the deformation region, the axis of the stiffness region and the axis of the through hole coincide.

[0023] And / or, the deformation region is gradually recessed towards the bottom of the sheath sealing cover from the edge to the center, or the deformation region is gradually raised towards the top of the sheath sealing cover from the edge to the center.

[0024] The second aspect discloses a ureteral sheath comprising the sheath sealing cover of the first aspect.

[0025] The technical scheme adopted by the utility model can achieve the following beneficial effects:

[0026] When the instrument enters or exits the through hole, the deformation region of the sheath sealing cover of the present application elastically deforms and pulls the stiffness region. The stiffness region has sufficient rigidity, and during the elastic deformation of the deformation region, the stiffness region maintains reliable cooperation with the sheath tube seat through its rigidity, so that the stiffness region is not easy to separate from the sheath tube seat. BRIEF DESCRIPTION OF DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is the isometric view of the sheath sealing cap of this utility model. Figure 1 ;

[0029] Figure 2 This is the isometric view of the sheath sealing cap of this utility model. Figure 2 ;

[0030] Figure 3 This is a top view of the sheath sealing cap of this utility model;

[0031] Figure 4 yes Figure 3 Sectional view of the middle AA plane Figure 1 ;

[0032] Figure 5 yes Figure 3 Sectional view of the middle AA plane Figure 2 ;

[0033] Figure 6 This is an isometric view of the ureteral sheath of this utility model;

[0034] Figure 7 This is an isometric view of the sheath seat of this utility model;

[0035] Figure 8 A cross-sectional view of the ureteral sheath of this utility model.

[0036] In the picture:

[0037] 100-Sheath sealing cap, 110-Deformation zone, 111-Through hole, 120-Stiffness zone, 121-Circumferential sidewall, 122-Connecting structure, 123-First limiting part, 124-Interference fit part, 130-Floating cavity, 131-Reinforcing rib;

[0038] 200-Ureteral sheath, 201-Sheath seat, 202-Second limiting part. Detailed Implementation

[0039] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0040] 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 interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0041] The inventor found in use that when the instrument enters or exits the ureteral sheath 200 through the through hole 111 of the existing ureteral sheath 200, the sheath sealing cover 100 used for sealing the inserted instrument will shrink radially, causing the outer wall of the sheath sealing cover 100 to separate from the sheath tube seat 201 of the ureteral sheath 200 and unable to realize interference fit or reduce friction, thereby making the sheath sealing cover 100 easily separate from the sheath tube seat 201.

[0042] The sheath sealing cover 100 and the ureteral sheath 200 provided by the present application will be described in detail below in combination with the accompanying drawings Figures 1 to 8 and application scenarios of specific embodiments.

[0043] Some embodiments of the present application provide a sheath sealing cover 100, as shown in Figure 1 and Figures 3-5 , comprising a deformation zone 110 and a rigidity zone 120.

[0044] As shown in Figures 1-5As shown, the deformation zone 110 has an axial through hole 111, and the deformation zone 110 elastically deforms when the instrument enters or exits the through hole 111. The elastic deformation of the deformation zone 110 can significantly reduce the mechanical impact and frictional resistance of the instrument when entering or exiting the through hole 111, buffer the stress concentration in the contact instant, reduce the hard scraping of the instrument surface and the inner wall of the through hole 111, and avoid the deformation, wear or structural damage of the instrument caused by rigid collision or excessive extrusion. At the same time, the elastic deformation allows the inner diameter of the through hole 111 to adapt to the size or shape change of the instrument, which can not only smoothly pass through different specifications of instruments, but also disperse local stress through uniform wrapping, thereby effectively protecting the integrity of the instrument and prolonging its service life during operation.

[0045] As shown in Figure 1 and Figures 3-5 The rigidity zone 120 is used to connect with the sheath tube seat 201 of the ureteral sheath 200 and surrounds the connection deformation zone 110. During the elastic deformation of the deformation zone 110, the rigidity zone 120 will be pulled, and the rigidity zone 120 maintains reliable cooperation with the sheath tube seat 201 through its rigidity, greatly reduces the degree of radial shrinkage of the sheath sealing cover 100 caused by the pulling of the deformation zone 110 to the rigidity zone 120, and ensures that the rigidity zone 120 and the sheath tube seat 201 are always in interference fit, avoiding the disconnection of the sheath sealing cover 100 and the sheath tube seat 201.

[0046] The rigidity zone 120 includes a rigid structure formed by bending the corresponding area of the sheath sealing cover 100. The bending structure makes the sheath sealing cover 100 extend to the upper and lower sides, significantly increases the sectional moment of inertia, and further forms the rigidity zone 120.

[0047] And / or, the rigidity zone 120 includes a rigid structure formed by thickening the corresponding area of the sheath sealing cover 100. The thickening structure increases the thickness of the corresponding area of the sheath sealing cover 100, reduces local stress concentration, disperses external load, further suppresses plastic deformation, and further forms the rigidity zone 120.

[0048] And / or, the rigidity zone 120 includes a rigid structure formed by reinforcing the corresponding area of the sheath sealing cover 100. The reinforcing structure makes the sheath sealing cover 100 form a multidirectional structure, decomposes the external load into axial stress along the reinforcing structure, and efficiently transmits the stress to the rigid base through path optimization, thereby forming the rigidity zone 120.

[0049] It should be noted that reinforcing the corresponding area of the sheath sealing cover 100 means that a plurality of reinforcing ribs are arranged in the corresponding area of the sheath sealing cover 100, or a multi-ridge or corrugated structure is formed in the corresponding area of the sheath sealing cover 100, or other ways, which are not limited in the present embodiment.

[0050] And / or, the stiffness region 120 comprises a rigid structure formed by bending a corresponding region of the sheath seal cap 100. The use of a high modulus of elasticity material directly improves the sheath seal cap 100's ability to resist deformation, and in turn requires a greater external force to induce an equivalent deformation. The characteristics of a high modulus of elasticity material are used to form the stiffness region 120.

[0051] In some embodiments, the stiffness region 120 comprises a rigid structure formed by bending a corresponding region of the sheath seal cap 100.

[0052] In some embodiments, the stiffness region 120 comprises a rigid structure formed by bending and thickening a corresponding region of the sheath seal cap 100.

[0053] In some embodiments, the stiffness region 120 comprises a rigid structure formed by bending, thickening, and reinforcing a corresponding region of the sheath seal cap 100.

[0054] In some embodiments, the stiffness region 120 comprises a rigid structure formed by bending, thickening, and reinforcing a corresponding region of the sheath seal cap 100, and is made of a high modulus of elasticity material.

[0055] In some embodiments, the stiffness region 120 comprises a rigid structure formed by thickening a corresponding region of the sheath seal cap 100.

[0056] In some embodiments, the stiffness region 120 comprises a rigid structure formed by thickening and reinforcing a corresponding region of the sheath seal cap 100.

[0057] In some embodiments, the stiffness region 120 comprises a rigid structure formed by thickening and reinforcing a corresponding region of the sheath seal cap 100, and is made of a high modulus of elasticity material.

[0058] In some embodiments, the stiffness region 120 comprises a rigid structure formed by reinforcing a corresponding region of the sheath seal cap 100.

[0059] In some embodiments, the stiffness region 120 comprises a rigid structure formed by reinforcing a corresponding region of the sheath seal cap 100, and is made of a high modulus of elasticity material.

[0060] In some embodiments, the stiffness region 120 comprises a rigid structure formed by a high modulus of elasticity material made of a corresponding region of the sheath seal cap 100.

[0061] As Figure 1 , Figure 4 and Figure 5As shown, the height position of the through hole 110 is lower than the top surface of the sheath sealing cover 100. By designing the through hole 110 to be sunken, the height of the through hole 110 is lower than the top surface of the sheath sealing cover 100, which reduces the activity range of the instrument caused by manual operation during surgery, thereby reducing the local deformation and stress concentration of the deformation zone 110. This structural optimization effectively reduces the tearing damage of the instrument to the deformation zone 110, greatly improving the reliability and service life of the sealing structure.

[0062] As shown in Figure 1 , Figure 4 and Figure 5 , the rigidity zone 120 extends towards the bottom of the sheath sealing cover 100 near one end of the axis and surrounds the deformation zone 110, so that the height position of the through hole 111 is lower than the top of the sheath sealing cover 100 in the axial direction of the sheath sealing cover 100. The near-axis end of the rigidity zone 120 extends towards the bottom of the sheath sealing cover 100, while constructing a double structural feature of sunken and bent. The sunken part reduces the height of the through hole 111, reducing the tearing damage of the instrument to the deformation zone 110; the bent part increases the rigidity of the sheath sealing cover 100, ensuring that the sheath sealing cover 100 is tightly connected with the sheath tube seat 201.

[0063] and / or, the rigidity zone 120 and the deformation zone 110 form a stepped structure, so that the height position of the through hole 111 is lower than the top surface of the sheath sealing cover 100 in the axial direction of the sheath sealing cover 100. By forming a stepped structure between the rigidity zone 120 and the deformation zone 110, the top surface of the deformation zone 110 is lower than the top surface of the sheath sealing cover 100 in the axial direction of the sheath sealing cover 100, and the height position of the through hole 111 is lower than the top surface of the sheath sealing cover 100 in the axial direction of the sheath sealing cover 100, thereby reducing the height of the through hole 111 and reducing the tearing damage of the instrument to the deformation zone 110.

[0064] As shown in Figure 1 , Figure 2 , Figure 4 and Figure 5 , the rigidity zone 120 includes a circumferential side wall 121 of the sheath sealing cover 100, and a connection structure 122 connecting the circumferential side wall 121 and the deformation zone 110, and the connection structure 122 is bent to define a floating cavity 130 between the circumferential side wall 121.

[0065] The floating cavity 130 is formed between the bending structure of the connection structure 122 and the circumferential side wall 121, and provides a compensation mechanism for the radial and axial deformation of the deformation area 110. When the deformation area 110 is subjected to a radial force, the floating cavity 130 allows the connection structure 122 to elastically deflect towards the circumferential side wall 121, absorbs the transverse expansion stress, and avoids excessive stretching of the deformation area 110 due to the material extension limit. When the deformation area 110 is subjected to an axial force, the floating cavity 130 provides a redundant space for the axial compression or stretching of the connection structure 122, buffers the axial displacement through the geometric deformation of the bending structure, and prevents stress concentration at the connection between the sheath sealing cover 100 and the sheath seat 201 due to rigid constraints. By reserving a controllable deformation freedom, the deformation area 110 can adapt to external operating loads with a more uniform strain distribution when subjected to stress, which not only meets the demand for flexible bending in the dynamic use of the instrument, but also avoids fatigue or tearing failure of the sealing structure caused by excessive local deformation.

[0066] As shown in Figure 2 The floating cavity 130 is formed between the bending structure of the connection structure 122 and the circumferential side wall 121, and provides a compensation mechanism for the radial and axial deformation of the deformation area 110. When the deformation area 110 is subjected to a radial force, the floating cavity 130 allows the connection structure 122 to elastically deflect towards the circumferential side wall 121, absorbs the transverse expansion stress, and avoids excessive stretching of the deformation area 110 due to the material extension limit. When the deformation area 110 is subjected to an axial force, the floating cavity 130 provides a redundant space for the axial compression or stretching of the connection structure 122, buffers the axial displacement through the geometric deformation of the bending structure, and prevents stress concentration at the connection between the sheath sealing cover 100 and the sheath seat 201 due to rigid constraints. By reserving a controllable deformation freedom, the deformation area 110 can adapt to external operating loads with a more uniform strain distribution when subjected to stress, which not only meets the demand for flexible bending in the dynamic use of the instrument, but also avoids fatigue or tearing failure of the sealing structure caused by excessive local deformation.

[0067] In the embodiment, the distance between any two adjacent reinforcing ribs 131 is equal. The reinforcing ribs 131 can be 2, 3, 4, 5 or more, and can be flexibly set according to the use requirement. In the embodiment, the number of reinforcing ribs 131 is preferably 4, and the reinforcing ribs 131 can also be other numbers.

[0068] In some embodiments, the connection structure 122 is bent to define the floating cavity 130 between the circumferential side wall 121, and the floating cavity 130 is not provided with the reinforcing ribs 131.

[0069] In some embodiments, the connection structure 122 is bent to define the floating cavity 130 between the circumferential side wall 121, and the floating cavity 130 is provided with a plurality of reinforcing ribs 131 along the circumferential direction.

[0070] It should be noted that the above two embodiments can be used in the structure of the sheath sealing cover 100. One structure provides a compensation mechanism for the deformation of the deformation area 110 in the radial and axial directions by setting the floating cavity 130; the other structure improves the rigidity of the rigid area 120 by setting multiple reinforcing ribs 131 between the floating cavities 130, and supports the deformation area 110.

[0071] As shown in Figure 2 , Figure 4 and Figure 5 , the circumferential side wall 121 has an interference fit portion 124 on the mating surface with the sheath seat 201. When the sheath sealing cover 100 is assembled with the sheath seat 201, the interference fit portion 124 causes the circumferential side wall 121 and the mating surface of the sheath seat 201 to form a tight compression, thereby better preventing the circumferential side wall 121 and the mating surface of the sheath seat 201 from generating a gap or separating due to dynamic load.

[0072] In some embodiments, the interference fit portion 124 is one, extending along the circumference of the sheath sealing cover 100.

[0073] In some embodiments, the interference fit portion 124 is multiple, arranged at intervals on the mating surface of the circumferential side wall 121 and the sheath seat 201.

[0074] Specifically, the outer wall of the interference fit portion 124 has an inclined surface, which is inclined towards the axis of the sheath sealing cover 100 from the top of the sheath sealing cover 100 to the bottom of the sheath sealing cover 100. The inclined surface forms a wedge-shaped structure, which guides the precise alignment of the mating surface of the sheath seat 201 when the sheath sealing cover 100 is assembled with the sheath seat 201, and at the same time, with the increase of the interference amount, the inclined surface converts the axial pressing force into radial expansion force, forcing the circumferential side wall 121 to have uniform radial pre-tightening contact pressure with the inner wall of the sheath seat 201.

[0075] and / or, as shown in Figure 1 , Figure 2 and Figure 7 , the circumferential side wall 121 has a first limiting portion 123, and the sheath seat 201 has a second limiting portion 202 matched with the first limiting portion 123, to realize the circumferential limiting of the sheath sealing cover 100 and the sheath seat 201. When the sheath sealing cover 100 is assembled with the sheath seat 201, the first limiting portion 123 and the second limiting portion 202 cooperate to forcibly constrain the relative rotation of the sheath sealing cover 100 and the sheath seat 201 in the circumferential direction, preventing the circumferential misalignment of the sheath sealing cover 100 and the sheath seat 201 caused by instrument operation torsional load or vibration.

[0076] The first limiting part 123 and the second limiting part 202 are the same in number, and can be multiple. The multiple first limiting parts 123 are equidistantly arranged along the circumferential side wall 121 of the sheath sealing cover 100, and the multiple second limiting parts 202 are equidistantly arranged along the inner wall of the sheath tube seat 201.

[0077] In some embodiments, the first limiting part 123 is a protrusion, and the second limiting part 202 is a groove.

[0078] In some embodiments, the first limiting part 123 is a groove, and the second limiting part 202 is a protrusion.

[0079] As shown in Figure 4 and Figure 5 , the radius of the rigidity zone 120 is 1.5-3 times the radius of the deformation zone 110. By setting the radius of the rigidity zone 120 to be 1.5-3 times the radius of the deformation zone 110, the rigidity zone 120 can have sufficient rigidity in this range, achieving the effect of reliable anti-disengagement, and the deformation zone 110 can have effective deformation ability, adapting to the insertion action of the instrument, avoiding damage to the instrument, and better fitting the instrument to ensure effective sealing between the through hole 111 and the instrument.

[0080] In some embodiments, the radius of the rigidity zone 120 is any one of 1.5 times, 1.8 times, 2.5 times, and 3 times the radius of the deformation zone 110.

[0081] As shown in Figure 3 , the through hole 111 is located at the center of the deformation zone 110. The through hole 111 is arranged at the center of the deformation zone 110, and when the instrument is inserted into the through hole 111 and subjected to external operating force, the deformation zone 110 expands or compresses uniformly in the radial direction around the center through hole 111, avoiding asymmetric stress distribution caused by eccentric force, and reducing the risk of tearing of the deformation zone 110 caused by unilateral stretching / pressing.

[0082] As shown in Figure 3 , the axis of the deformation zone 110, the axis of the rigidity zone 120, and the axis of the through hole 111 coincide. By aligning the axis of the deformation zone 110, the axis of the rigidity zone 120, and the axis of the through hole 111, when the instrument is inserted into the through hole 111 and subjected to external operating force, the deformation zone 110 expands or compresses uniformly in the radial direction around the center through hole 111, and then uniformly pulls the rigidity zone 120, avoiding asymmetric stress distribution caused by eccentric force, and reducing the risk of disengagement of the sheath sealing cover 100 and the sheath tube seat 201.

[0083] and / or, as shown in Figure 4 and Figure 5As shown, the deformation zone 110 is gradually recessed from the edge to the center towards the bottom of the sheath sealing cover 100, or the deformation zone 110 is gradually raised from the edge to the center towards the top of the sheath sealing cover 100.

[0084] In some embodiments, the deformation zone 110 is gradually recessed from the edge to the center towards the bottom of the sheath sealing cover 100. When the instrument passes through the through hole 111, the edge of the deformation zone 110 tightens to the middle, so that the deformation zone 110 has a better sealing effect on the instrument.

[0085] In some embodiments, the deformation zone 110 is gradually raised from the edge to the center towards the top of the sheath sealing cover 100. When the instrument passes through the through hole 111, the raised deformation zone 110 is deformed downward under force, and in this process, the deformation zone 110 causes less tension to the rigidity zone 120.

[0086] Some embodiments of the present application provide a ureteral sheath 200, as shown, comprising a sheath sealing cover 100. Figures 6-8 As shown, comprising a sheath sealing cover 100.

[0087] It should be noted that in this paper, the term "including", "containing" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a…" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0088] 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, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0089] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A sheath sealing cap, applied to a ureteral sheath, characterized in that, The sheath sealing cap includes a deformation zone and a stiffness zone; The deformation zone has an axially penetrating through hole. When the instrument enters or leaves the through hole, the deformation zone undergoes elastic deformation. The stiffness zone is used to connect with the sheath seat of the ureteral sheath and surrounds the deformation zone; during the elastic deformation of the deformation zone, the stiffness zone maintains a reliable fit with the sheath seat through its rigidity.

2. The sheath sealing cap according to claim 1, characterized in that, The stiffness zone includes a rigid structure formed by bending the corresponding area of ​​the sheath seal cap; And / or, the stiffness region includes a rigid structure formed by thickening the corresponding area of ​​the sheath seal cap; And / or, the stiffness region includes a rigid structure formed by reinforcing the corresponding area of ​​the sheath seal cap; And / or, the stiffness region includes a rigid structure formed by making the corresponding area of ​​the sheath seal cap from a high elastic modulus material.

3. The sheath sealing cap according to claim 1, characterized in that, In the axial direction of the sheath seal cover, the height of the through hole is lower than the top surface of the sheath seal cover.

4. A sheath sealing cap according to claim 3, characterized in that, The stiffness zone extends towards the bottom of the sheath seal at one end near the axis and surrounds the deformation zone, such that the height of the through hole is lower than the top surface of the sheath seal in the axial direction. And / or, the stiffness zone and the deformation zone form a stepped structure, such that the height of the through hole is lower than the top surface of the sheath seal in the axial direction.

5. A sheath sealing cap according to claim 3, characterized in that, The stiffness zone includes the circumferential sidewall of the sheath seal and the connecting structure that connects the circumferential sidewall to the deformation zone. The connecting structure is bent to define a floating cavity between itself and the circumferential sidewall.

6. A sheath sealing cap according to claim 5, characterized in that, The floating cavity is provided with multiple reinforcing ribs at intervals along its circumference.

7. A sheath sealing cap according to claim 3, characterized in that, The mating surface between the circumferential sidewall and the sheath seat has an interference fit. And / or, the circumferential sidewall has a first limiting portion, and the sheath seat has a second limiting portion that cooperates with the first limiting portion, so as to achieve circumferential limiting of the sheath sealing cap and the sheath seat.

8. A sheath sealing cap according to claim 3, characterized in that, The radius of the stiffness zone is 1.5 to 3 times the radius of the deformation zone.

9. A sheath sealing cap according to claim 3, characterized in that, The through hole is located at the center of the deformation zone; the axis of the deformation zone, the axis of the stiffness zone, and the axis of the through hole coincide. And / or, the deformation area gradually recesses from the edge toward the center toward the bottom of the sheath seal, or the deformation area gradually bulges from the edge toward the center toward the top of the sheath seal.

10. A ureteral sheath, characterized in that, Includes the sheath sealing cap as described in any one of claims 1-9.

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