Sheath handle and guide sheath
Patent Information
- Application Number
- CN202522498326.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-11-25
AI Technical Summary
这使得导引鞘的组装工作繁琐且费时，还容易磨损或破坏压盖和鞘座之间的配合部位
[0007]本申请采用的技术方案能够达到以下有益效果：鞘座的开口可用来插入内窥镜的插入部，插入部通过开口伸入导引鞘内部，使导引鞘和插入部能够相互配合。密封件被鞘座压抵于鞘座上，并密封开口，密封件能够与插入部密封配合，避免流体从鞘座和插入部之间泄漏。鞘座的鞘壁和周向侧壁中的一者凸设有导正部，另一者具有与导正部配合的配合部位。以鞘座的鞘壁具有导正部为例，在压盖和鞘座的组装过程中，导正部抵接周向侧壁的配合部位，使压盖与鞘座同轴，避免压盖在安装过程中出现晃动、倾斜等情况，确保锁定部能够与周向侧壁精准对齐并相互锁定，减少了因压盖相对于鞘座偏斜等而导致压盖无法安装在鞘座上的风险，杜绝了因为反复组装而造成鞘座磨损等，提高了导引鞘的使用安全性。
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Figure CN224876757U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and in particular to a sheath handle and a guide sheath. Background Technology
[0002] As one of the important medical devices in modern surgery, the guide sheath can create a passage in the human body cavity to allow endoscopes and other instruments to be inserted into the body for diagnosis and treatment. The guide sheath is usually assembled from several components such as the sheath tube, sheath seat, and pressure cap. The pressure cap firmly fixes the sealing ring and other components to the sheath seat.
[0003] In existing technology, the gland is fixedly assembled to the sheath seat via a screw-on structure. During the process of rotating the gland onto the sheath seat, the gland is prone to wobbling or tilting relative to the sheath seat, which can cause installation deviations between the gland and the sheath seat. Therefore, the gland and sheath seat need to be repeatedly adjusted and reassembled to achieve correct assembly. This makes the assembly of the guide sheath cumbersome and time-consuming, and is also prone to wear or damage to the mating parts between the gland and the sheath seat. Utility Model Content
[0004] The purpose of this application is to provide a sheath handle and a guide sheath to solve the aforementioned technical problems existing in the prior art.
[0005] In a first aspect, this application provides a sheath handle for guiding a sheath. The sheath handle includes a sheath seat, a seal, and a pressure cap. The sheath seat has an opening, and the pressure cap connects to the sheath seat and presses the seal against the sheath seat to seal the opening. The pressure cap has a circumferential sidewall, and the sheath seat is provided with a locking part. The circumferential sidewall can lock with the locking part. One of the sheath wall and the circumferential sidewall of the sheath seat has a protruding guide part, and the other has a mating part that mates with the guide part. The guide part is distributed around the central axis of the sheath seat. During the assembly of the pressure cap and the sheath seat, the guide part abuts against the mating part, making the pressure cap coaxial with the sheath seat.
[0006] Secondly, this application provides a guide sheath, which includes a sheath handle as described in the first aspect.
[0007] The technical solution adopted in this application achieves the following beneficial effects: The opening of the sheath seat can be used to insert the insertion part of the endoscope. The insertion part extends into the guide sheath through the opening, allowing the guide sheath and the insertion part to cooperate with each other. The seal is pressed against the sheath seat by the sheath seat and seals the opening. The seal can seal with the insertion part, preventing fluid leakage between the sheath seat and the insertion part. One of the sheath wall and the circumferential side wall of the sheath seat has a protruding guide part, and the other has a mating part that mates with the guide part. Taking the sheath wall of the sheath seat having a guide part as an example, during the assembly of the cap and the sheath seat, the guide part abuts against the mating part of the circumferential side wall, making the cap and the sheath seat coaxial. This prevents the cap from shaking or tilting during installation, ensures that the locking part can be precisely aligned with the circumferential side wall and lock together, reduces the risk that the cap cannot be installed on the sheath seat due to misalignment of the cap relative to the sheath seat, eliminates wear on the sheath seat caused by repeated assembly, and improves the safety of the guide sheath in use.
[0008] Simultaneously, the sheath seat and gland can stably abut against each other, allowing the seal between them to withstand more uniform compressive force. This avoids uneven stress on one side of the seal caused by the gland being misaligned relative to the sheath seat. Uneven stress on the seal can weaken the sealing effect and lead to stress concentration in a certain area, resulting in breakage. This improves the sealing effect and extends the service life of the seal. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0010] Figure 1 This is a schematic diagram illustrating the structure of the sheath handle and the expander, as shown in an exemplary embodiment of this application; Figure 2 This is a cross-sectional view of the sheath handle and expander shown in an exemplary embodiment of this application; Figure 3 yes Figure 2 Enlarged view of point a in the image; Figure 4 This is a schematic diagram of the sheath seat structure shown in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the sheath seat structure from another perspective, illustrating an exemplary embodiment of this application; Figure 6 yes Figure 5 Enlarged view of point b in the image; Figure 7This is a cross-sectional view of another sheath handle and expander shown in an exemplary embodiment of this application; Figure 8 This is a schematic diagram of the structure of a guide sheath shown in an exemplary embodiment of this application.
[0011] In the diagram: 1. Guide sheath; 100. Sheath handle; 110. Sheath seat; 111. Guiding part; 112. Guiding front; 113. Abutment area; 114. Locking part; 115. Opening; 120. Seal; 130. Pressure cap; 131. Circumferential sidewall; 132. Connecting part; 133. Limiting part; 140. Limiting groove; 150. Limiting block; 151. Fastening part; 200. Expander. Detailed Implementation
[0012] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0013] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0014] In the various embodiments of this application, "near end" and "far end" refer to the distance of each component from the user in the usage environment. The end closer to the user is designated as the "near end", and the end farther from the user is designated as the "far end".
[0015] In existing technology, during the rotational installation of the pressure cap onto the sheath seat, the pressure cap is prone to wobbling or tilting relative to the sheath seat. The pressure cap may become misaligned relative to the sheath seat, causing one locking mechanism of the pressure cap to engage with the sheath seat while the other locking mechanism fails to engage. This results in installation misalignment between the pressure cap and the sheath seat, and the two are not fully secured. When assembly personnel or medical staff discover this, the sheath seat and pressure cap must be disassembled and reassembled to achieve correct assembly. This makes the assembly of the guide sheath cumbersome and time-consuming, and also easily leads to wear or damage to the mating parts between the pressure cap and the sheath seat.
[0016] This application provides a sheath handle 100, please refer to... Figure 1 The sheath handle 100 is used to guide the sheath 1. Exemplarily, the guiding sheath 1 also includes an insertion tube, the proximal end of which is connected to the sheath handle 100, and the insertion tube can be inserted into the human body.
[0017] Please see Figure 2 The sheath handle 100 may include a sheath seat 110, a seal 120, and a pressure cap 130. The pressure cap 130 is connected to the sheath seat 110, and the seal 120 is located between the sheath seat 110 and the pressure cap 130.
[0018] The sheath seat 110 has an opening 115. A pressure cap 130 connects to the sheath seat 110 and presses a seal 120 against the sheath seat 110, thereby sealing the opening 115. The pressure cap 130 can be a disc or a ring structure, etc., and is not limited thereto. The seal 120 can be an elastic sealing gasket or an elastic sealing ring, etc., and can be made of rubber, etc., and is not limited thereto. Exemplarily, the pressure cap 130 and the sheath seat 110 are threaded together. Exemplarily, the pressure cap 130 can press the seal 120 against the sheath seat 110, with the edge of the seal 120 pressed between the pressure cap 130 and the sheath seat 110, so that the seal 120 can be correspondingly positioned with the opening 115, which enables the seal 120 to seal with the opening 115.
[0019] For further details, please refer to Figure 3 The pressure cap 130 has a circumferential sidewall 131, which can be a wall structure distributed circumferentially, such as a continuous annular structure or multiple intermittent block structures, etc., without limitation. The sheath seat 110 is provided with a locking part 114, and the circumferential sidewall 131 can be locked to the locking part 114. For example, the locking part 114 can be a protrusion, and the circumferential sidewall 131 is provided with a groove. As the sheath seat 110 and the pressure cap 130 rotate relative to each other, the protrusion can be screwed into the groove to lock the sheath seat 110 and the pressure cap 130 to each other. Of course, in some other cases, the circumferential sidewall 131 and the locking part 114 are connected by threads to allow the circumferential sidewall 131 and the locking part 114 to cooperate with each other.
[0020] Please continue reading. Figure 3 The sheath wall of the sheath seat 110 is provided with a guiding portion 111, which is distributed around the central axis of the sheath seat 110. The guiding portion 111 can be a continuous structure or multiple discrete structures distributed at intervals. For example, the guiding portion 111 can be a continuous annular structure, or in other cases, the guiding portion 111 can be composed of multiple protrusions distributed at intervals, without limitation. It should be noted that the guiding portion 111 can be formed on the inner or outer wall of the sheath seat 110, and the guiding portion 111 can cooperate with the pressure cap 130; this application does not impose any limitations. One of the sheath wall and the circumferential side wall 131 of the sheath seat 110 is provided with the guiding portion 111, and the other has a mating part that cooperates with the guiding portion 111. Taking the sheath wall of the sheath seat 110 having a guiding part 111, and the mating part being at least a portion of the circumferential sidewall 131, as an example, during the assembly of the cover 130 and the sheath seat 110, the guiding part 111 abuts against the mating part of the circumferential sidewall 131, making the cover 130 coaxial with the sheath seat 110. During the assembly of the cover 130 and the sheath seat 110, the guiding part 111 and the mating part cooperate to make the cover 130 coaxial with the sheath seat 110, avoiding the cover 130 from shaking or tilting during installation, ensuring that the locking part 114 can be precisely aligned with the circumferential sidewall 131 and locked together, reducing the risk that the cover 130 cannot be installed on the sheath seat 110 due to the cover 130 being misaligned relative to the sheath seat 110, eliminating wear on the sheath seat 110 caused by repeated assembly, and improving the safety of the guide sheath 1 in use.
[0021] Of course, in some other cases, the circumferential sidewall 131 of the cover 130 may also have a guide portion 111. The guide portion 111 may be a protrusion protruding from the inner surface of the circumferential sidewall 131. The mating part may be at least part of the sheath wall of the sheath seat 110. This may also allow the guide portion 111 and the circumferential sidewall 131 to cooperate with each other so that the cover 130 and the sheath seat 110 are coaxial, thus preventing the cover 130 from shaking or tilting during installation.
[0022] Meanwhile, the sheath seat 110 and the gland 130 can stably abut against each other, allowing the seal 120 located between them to receive more uniform compressive force. This avoids uneven force distribution on one side of the seal 120 due to the gland 130 being tilted relative to the sheath seat 110. Uneven force distribution on the seal 120 can weaken the sealing effect and cause stress concentration in a certain area, leading to breakage. This improves the sealing effect of the seal 120 and extends its service life.
[0023] Understandably, for ease of description, the following content will still take the sheath wall of the sheath seat 110 having a guiding part 111 and the mating part being at least a part of the wall of the circumferential side wall 131 as an example, and will not be elaborated or listed here.
[0024] In one implementation, please refer to Figure 4 The guide portion 111 can be an annular structure, extending circumferentially along the sheath seat 110, and coaxial with the sheath seat 110. Relative to the gland 130, the annular guide portion 111 forms a continuous annular contact surface. When the gland 130 is assembled, this annular contact surface can fully abut against the circumferential sidewall 131. Through the annular constraint, a balanced positioning force is applied from all circumferential directions of the gland 130, ensuring that the gland 130 remains coaxial with the sheath seat 110 during assembly, preventing misalignment. This design further improves the assembly effect between the gland 130 and the sheath seat 110, effectively reducing assembly defects caused by human error, enhancing the sealing performance and connection strength of the guide sheath 1, while reducing relative wear between the components of the guide sheath 1 and extending its service life.
[0025] In another embodiment, the number of guide portions 111 is multiple, such as two, three, or more, without limitation. The multiple guide portions 111 are distributed at intervals around the central axis of the sheath seat 110, and are located on the same circumference, with the center of the circumference located on the central axis of the sheath seat 110. Along different radial directions of the pressure cap 130, the multiple guide portions 111 can abut against the circumferential sidewall 131. Through the coordinated constraint of multiple points, the pressure cap 130 is positioned and guided from multiple directions during assembly. The multiple guide portions 111 can ensure the coaxiality of the pressure cap 130 and the sheath seat 110, preventing the pressure cap 130 from shifting. Furthermore, if the pressure cap 130 tilts or shifts relative to the sheath seat 110, the multiple guide portions 111 can simultaneously abut against and obstruct the pressure cap 130. Meanwhile, there is a deformation space between two adjacent guide sections 111, and the guide section 111 can deform through the deformation space to buffer the stress applied to the guide section 111 by the pressure cap 130.
[0026] Of course, in some other cases, the multiple guiding parts 111 can be radially staggered and distributed in the sheath seat 110. That is, the sheath seat 110 includes a first part and a second part distributed along the axial direction, with some of the guiding parts 111 located in the first part and the remaining guiding parts 111 located in the second part. The multiple guiding parts 111 can still act simultaneously on the pressure cap 130 to guide the pressure cap 130 relative to the central axis of the sheath seat 110. This arrangement can distribute external force to more areas of the sheath seat 110, improving the force-bearing effect, and can also avoid other structures on the sheath seat 110, such as the locking part 114, to prevent mutual interference. This is not a limitation here.
[0027] In the embodiments of this application, please refer to Figure 5 as well as Figure 6 The outer surface of the guide portion 111 has a guide surface 112, which abuts against the inner wall of the pressure cap 130. For example, the guide surface 112 can be curved, and it can be distributed around the central axis of the sheath seat 110. Compared to curved surfaces or point contact, surface contact increases the contact area between the guide portion 111 and the pressure cap 130. A larger contact area allows for more stable constraint of the pressure cap 130 by the guide portion 111, reducing offset caused by unstable contact points during assembly. This enhances the positioning effect of the guide portion 111 on the pressure cap 130, improves overall coaxiality accuracy, prevents the pressure cap 130 from shaking or tilting during installation, and ensures that the locking portion 114 can be precisely aligned with and locked to the circumferential sidewall 131.
[0028] It should be noted that when there are multiple guide parts 111, each guide part 111 has a guide face 112. The guide faces 112 of the multiple guide parts 111 pass through the same circumference, and the center of the circumference is located on the central axis of the sheath seat 110. This ensures that the guide faces 112 of the multiple guide parts 111 can simultaneously press against the circumferential sidewall 131 of the cover 130, so as to reduce the offset caused by unstable contact points during assembly and avoid the cover 130 from shaking or tilting during installation.
[0029] In existing technologies, negative pressure is generated inside the guide sheath during surgery. Under the influence of this negative pressure, the sealing pad collapses towards the center, causing its edges to detach from the pressing point, resulting in the sealing pad separating from the sheath and sealing failure. Please refer again to the embodiments of this application. Figure 3 The inner wall of the gland 130 is provided with a limiting part 133, which is located on the side of the seal 120 near the central axis of the sheath seat 110. The limiting part 133 abuts against and limits the seal 120. The shape of the limiting part 133 can be a ring or a cylindrical structure, etc., and is not limited. For example, the limiting part 133 can be a ring-shaped wall structure. The limiting part 133 can apply a force to the seal 120 radially, which can both limit the radial displacement of the seal 120 and provide radial support for the seal 120, preventing the seal 120 from tilting or collapsing in the direction of the central axis of the sheath seat 110 under stress or vibration, and ensuring that the installation position of the seal 120 is relatively stable.
[0030] In the embodiments of this application, please refer to Figure 7 One of the circumferential sidewall 131 and the locking part 114 is provided with a limiting groove 140, and the other is provided with a limiting block 150. The limiting groove 140 extends circumferentially along the sheath seat 110, and the limiting block 150 can be screwed into the limiting groove 140. For example, as Figure 7 As shown, a limiting groove 140 may be provided on the circumferential sidewall 131, and a limiting block 150 may be provided on the locking part 114. The limiting block 150 may be embedded in the limiting groove 140. The limiting block 150 and the limiting groove 140 may be connected to limit the separation of the pressure cap 130 and the sheath seat 110 in the circumferential direction, thereby achieving mutual locking between the two and preventing the pressure cap 130 and the sheath seat 110 from separating from each other.
[0031] Of course, in some other cases, the locking part 114 may be provided with a limiting groove 140, and the circumferential sidewall 131 may be provided with a limiting block 150. The limiting block 150 may be embedded in the limiting groove 140. This application embodiment does not impose any limitations.
[0032] Please refer to the previous document. Figure 5 The limiting block 150 is provided with a fastening portion 151, which protrudes from the side wall of the limiting block 150 and can fasten to the groove wall forming the limiting groove 140. For example, the groove wall of the limiting groove 140 has a recess; when the limiting block 150 is inserted into the limiting groove 140, the protruding fastening portion 151 engages with the recess in the groove wall. The fastening portion 151 abuts against the groove wall, forming a reverse constraint to prevent the limiting block 150 from dislodging from the limiting groove 140. This also limits the circumferential separation of the pressure cap 130 and the sheath seat 110, enhancing the stability of the connection between the sheath seat 110 and the pressure cap 130.
[0033] Please see Figure 1 as well as Figure 3 The outer periphery of the pressure cap 130 is provided with a connecting portion 132, which is adapted to connect with the expander 200. The connecting portion 132, which is fastened to the expander 200, provides a restraining effect, limiting the relative movement between the expander 200 and the pressure cap 130, and improving the consistency of movement between the expander 200 and the sheath seat 110. When the pressure cap 130 and the sheath seat 110 are assembled, the guide portion 111 and the connecting portion 132 are arranged radially opposite each other along the sheath handle 100. The protruding connecting portion 132 increases the structural strength of the area of the sheath seat 110 opposite to the guide portion 111, preventing the pressure cap 130 from deforming when it is under stress in contact with the guide portion 111. This ensures that the pressure cap 130 and the guide part 111 always maintain a stable contact state, and will not cause contact gaps or poor contact due to deformation of the pressure cap 130, thereby improving the contact effect between the two and ensuring the positioning accuracy of the guide part 111 on the pressure cap 130.
[0034] Please see Figure 3The outer surface of the sheath seat 110 may also include an abutment region 113, the outer diameter of which is larger than the remaining area of the outer surface. For example, the sheath seat 110 is a conical or frustum-shaped structure, and its outer diameter increases progressively from the distal to the proximal end. In other words, the proximal outer diameter of the sheath seat 110 is larger than the outer diameter of other portions, allowing the guide portion 111 to abut against the inner wall of the pressure cap 130 while the pressure cap 130 abuts against the abutment region 113. The guide part 111 is disposed on the sheath wall of the sheath seat 110. When the guide part 111 abuts against the mating part of the circumferential side wall 131, the circumferential side wall 131 of the cover 130 will also abut against the abutting area 113. The abutting area 113 and the guide part 111 simultaneously position and constrain the circumferential side wall 131 of the cover 130. The two act together on the circumferential side wall 131 of the cover 130 to further ensure the coaxiality of the cover 130. This ensures that the locking part 114 can be accurately aligned with the circumferential side wall 131 and locked together, while also enhancing the support stability of the cover 130 after assembly.
[0035] To achieve the above and other related objectives, this application provides a guide sheath 1, please refer to [link / reference]. Figure 8 The guide sheath 1 includes the sheath handle 100 as described above. This gives the guide sheath 1 the beneficial effects of any of the aforementioned solutions, which will not be elaborated further here.
[0036] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0037] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than 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.
[0038] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.
Claims
1. A sheath handle for guiding a sheath, characterized in that, The sheath handle includes a sheath seat, a seal, and a pressure cap, wherein: The sheath seat has an opening, the pressure cap is connected to the sheath seat and presses the sealing element against the sheath seat, so that the sealing element seals the opening; The pressure cap has a circumferential sidewall, and the sheath seat is provided with a locking part, wherein the circumferential sidewall can be locked to the locking part; One of the sheath wall and the circumferential sidewall of the sheath seat is provided with a guide portion, and the other has a mating part that cooperates with the guide portion. The guide portion is distributed around the central axis of the sheath seat. During the assembly of the cover and the sheath seat, the guide portion abuts against the mating part, so that the cover and the sheath seat are coaxial.
2. The sheath handle according to claim 1, characterized in that, The guiding part is a ring-shaped structure, which extends circumferentially along the sheath seat and is coaxial with the sheath seat.
3. The sheath handle according to claim 1, characterized in that, The number of the guiding parts is multiple, and the multiple guiding parts are distributed at intervals around the central axis of the sheath seat. The multiple guiding parts are distributed on the same circumference, and the center of the circumference is located on the central axis of the sheath seat.
4. The sheath handle according to any one of claims 1-3, characterized in that, The outer surface of the guide portion has a guide front, which abuts against the inner wall of the pressure cap.
5. The sheath handle according to any one of claims 1-3, characterized in that, The inner wall of the gland is provided with a limiting part, which is located on the side of the seal near the central axis of the sheath seat. The limiting part abuts against and limits the seal.
6. The sheath handle according to claim 1, characterized in that, One of the circumferential sidewall and the locking part is provided with a limiting groove, and the other is provided with a limiting block. The limiting groove extends circumferentially along the sheath seat, and the limiting block can be embedded in the limiting groove.
7. The sheath handle according to claim 6, characterized in that, The limiting block is provided with a fastening part, which protrudes relative to the side wall of the limiting block and can fasten to the groove wall forming the limiting groove.
8. The sheath handle according to claim 1, characterized in that, The outer periphery of the pressure cap is provided with a connecting part, which is adapted to be connected to the expander. When the pressure cap and the sheath seat are assembled together, the guide part and the connecting part are arranged radially correspondingly along the sheath handle.
9. The sheath handle according to claim 1, characterized in that, The outer surface of the sheath seat also includes an abutment area, the outer diameter of which is larger than the remaining area of the outer surface. The guide part is disposed on the sheath wall of the sheath seat. While the guide part abuts against the mating part of the circumferential sidewall, the circumferential sidewall can abut against the abutment area.
10. A guiding sheath, characterized in that, The guide sheath includes a sheath handle as described in any one of claims 1-9.