Sheath handle and guide sheath

Abstract

The application discloses a sheath handle and a guide sheath, and relates to the technical field of medical devices. The sheath handle is used for the guide sheath. The sheath handle comprises a sheath seat, a sealing element and a gland. The sheath seat has an opening. The gland is connected to the sheath seat. The gland has a limiting portion. The sealing element has a limiting matching portion. In the radial outward direction of the sheath handle, the limiting portion abuts against the limiting matching portion. The limiting portion is located on the side of the limiting matching portion close to the central axis of the sheath seat and abuts against the limiting matching portion in the radial outward direction. When the sealing element is extruded and has a tendency to collapse towards the center, the limiting portion abuts against the limiting matching portion in the radial outward direction, provides radial outward support for the limiting matching portion, offsets the collapse tendency and avoids deformation of the limiting matching portion, which may cause damage to the structure of the sealing element or the appearance of a sealing gap. By inhibiting the collapse of the limiting matching portion, the sealing element can maintain a stable structure and ensure that the close-fitting property of the sealing element with the sheath seat and the gland is not damaged.

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 an important medical device in modern surgery, the guide sheath creates a passage in the body cavity to insert endoscopes and other instruments for diagnosis and treatment. The guide sheath can also create negative pressure suction to remove bodily fluids or stones. It is also equipped with a seal that seals the sheath seat and endoscope, ensuring the endoscope can be inserted into the sheath seat and preventing fluid leakage from the guide sheath.

[0003] During negative pressure suction, the negative pressure may force the seal to collapse and displace. This can cause the seal to fail, potentially leading to fluid leakage from the sheath and reducing the effectiveness of the guide sheath. Utility Model Content

[0004] The purpose of this application is to provide a sheath handle and a guide sheath that at least partially solves 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 seal is installed inside the sheath seat. The pressure cap has a limiting portion, and the seal has a limiting mating portion. The limiting portion and the limiting mating portion cooperate with each other. In the radially outward direction of the sheath handle, the limiting portion abuts against the limiting mating portion.

[0006] Secondly, this application provides a guide sheath, which includes a sheath handle and an expander as described in the first aspect, the expander being capable of being inserted into the sheath handle.

[0007] The technical solution adopted in this application can achieve the following beneficial effects: while the gland is locked with the sheath seat, it applies continuous and stable pressure to the seal, forcing the seal to deform. The deformed seal can tightly fit the edge of the opening and the contact surfaces of the sheath seat and the gland, filling the gap between the sheath seat and the gland, and ensuring that the seal forms a stable seal on the opening.

[0008] Compared to existing technologies, the seal of this application is installed inside the sheath seat, with a limiting portion protruding from the surface of the gland, and the seal has a limiting mating portion. The limiting portion and the limiting mating portion can be protruding or recessed structures, which can cooperate with each other. The limiting portion is located on the side of the limiting mating portion closer to the central axis of the sheath seat and abuts against the limiting mating portion in a radially outward direction. When the seal is compressed and may tend to collapse towards the center, the limiting portion abuts against the limiting mating portion in a radially outward direction, providing radially outward support to the limiting mating portion, at least partially offsetting the collapse tendency of the seal, and preventing deformation of the limiting mating portion from causing structural damage to the seal or the appearance of sealing gaps. By suppressing the collapse of the limiting mating portion, this application allows the seal to maintain a stable structure, ensuring that its tight fit with the sheath seat and gland is not compromised, thereby simultaneously improving the structural stability and sealing performance 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 of the sheath handle structure shown in an exemplary embodiment of this application; Figure 2 This is a cross-sectional view of the sheath handle 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 structure of a sealing element shown in an exemplary embodiment of this application; Figure 5 This is a cross-sectional view of a seal shown in an exemplary embodiment of this application; Figure 6 This is a schematic diagram illustrating the structure of another sheath handle, as shown in an exemplary embodiment of this application; Figure 7 This is a cross-sectional view of another sheath handle shown in an exemplary embodiment of this application; Figure 8 yes Figure 7 Enlarged view of point b in the image; Figure 9 This is a schematic diagram of the structure of a guide sheath shown in an exemplary embodiment of this application.

[0011] In the figure: 1. Guiding sheath; 100. Sheath handle; 110. Sheath seat; 111. Opening; 112. Step; 120. Seal; 121. Circumferential sidewall; 1211. First part; 1212. Second part; 122. Sealing part; 123. Limiting mating part; 130. Pressure cap; 131. Limiting part; 1311. First surface; 132. Through hole; 200. Expander; 210. Mounting connector; 211. Second surface; 220. Clip. 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] Seals need to withstand a certain pressure to deform and seal. For example, existing technologies use structures such as glands to compress and deform the seals, which increases the pressure between the seals and the sheath. The increased pressure can effectively prevent the seals from falling off under negative pressure.

[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 guide sheath 1 also includes an insertion tube, the proximal end of which is connected to the sheath handle 100. The sheath handle 100 is adapted for gripping by a healthcare worker, and the insertion tube can be inserted into the body. Furthermore, an endoscope can be inserted into the guide sheath 1. The guide sheath 1 provides a passage for the endoscope to be inserted.

[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 presses the seal 120 against the sheath seat 110.

[0018] Please see Figure 2 The sheath seat 110 has an opening 111. The gland 130 presses the seal 120 against the sheath seat 110 and locks it in place, causing the seal 120 to deform and seal the opening 111. For example, the gland 130 and the sheath seat 110 are threaded together. While locking itself against the sheath seat 110, the gland 130 applies continuous and stable pressure to the seal 120, forcing it to deform. The deformed seal 120 fits tightly against the edge of the opening 111 and the contact surfaces of the sheath seat 110 and the gland 130, filling the gap between the sheath seat 110 and the gland 130, ensuring a stable seal between the seal 120 and the opening 111.

[0019] The seal 120 is installed inside the sheath seat 110. The pressure cap 130 has a limiting portion 131, and the seal 120 has a limiting mating portion 123. The limiting portion 131 and the limiting mating portion 123 cooperate with each other. The limiting portion 131 abuts against the limiting mating portion 123 in a radially outward direction along the sheath handle 100. Exemplarily, the limiting portion 131 and the limiting mating portion 123 can be a protruding structure and a recessed structure, respectively. For example, the limiting portion 131 is a protruding structure provided on the inner wall of the pressure cap 130, and the limiting mating portion 123 is a recessed structure provided on the surface of the seal 120. The protruding structure and the recessed structure are mutually limitingly engaged in a radial direction along the sheath handle 100. The limiting portion 131 limits and abuts against the limiting mating portion 123 in a radially outward direction. Of course, in some other cases, the limiting portion 131 can be a recessed structure, and the limiting mating portion 123 can be a protruding structure; they cooperate with each other without limitation. When the seal 120 is compressed and may tend to collapse towards the center, the limiting part 131 abuts against the limiting mating part 123 in a radially outward direction and provides radially outward support to the limiting mating part 123, at least partially offsetting the collapse tendency of the seal 120, and preventing deformation of the limiting mating part 123 from causing structural damage to the seal 120 or the appearance of a sealing gap. By suppressing the collapse of the limiting mating part 123, this application enables the seal 120 to maintain a stable structure, ensuring that its tight fit with the sheath seat 110 and the gland 130 is not compromised, thereby simultaneously improving the structural stability and sealing performance of the seal 120.

[0020] In a more specific implementation, please refer to Figure 3The limiting portion 131 protrudes from the surface of the pressure cap 130, and the sealing member 120 is provided with a circumferential sidewall 121. The limiting mating portion 123 is at least a portion of the circumferential sidewall 121. For example, the limiting mating portion 123 may be a circumferential sidewall 121 distributed around the central axis of the sheath seat 110, and the limiting portion 131 may be an annular structure distributed around the central axis of the sheath seat 110. The circumferential sidewall 121 is located on the side of the limiting portion 131 away from the central axis of the sheath seat 110. Of course, in some other cases, the limiting mating portion 123 is at least a portion of the circumferential sidewall 121. For example, the limiting mating portion 123 may be a recessed structure provided on the end face of the circumferential sidewall 121. When the seal 120 is compressed and may tend to collapse towards the center, the limiting portion 131 abuts against the circumferential sidewall 121 in a radially outward direction, providing outward support to the circumferential sidewall 121. This at least partially counteracts the collapse tendency of the seal 120, preventing deformation of the circumferential sidewall 121 that could lead to structural damage to the seal 120 or the appearance of a sealing gap. By suppressing the collapse of the circumferential sidewall 121, this application allows the seal 120 to maintain structural stability, ensuring that its tight fit with the sheath seat 110 and the gland 130 is not compromised, thereby simultaneously improving the structural stability and sealing performance of the seal 120.

[0021] In the embodiments of this application, please refer to Figure 4 and Figure 5 The seal 120 may further include a sealing portion 122, with a circumferential sidewall 121 connected to the sealing portion 122 and surrounding the periphery of the sealing portion 122. For example, the sealing portion 122 may be a disc structure, and the circumferential sidewall 121 may be an annular structure, meaning the seal 120 may be a cylinder with one open side. The circumferential sidewall 121 protrudes from the surface of the sealing portion 122 toward the side closer to the pressure cap 130, and the circumferential sidewall 121 radially abuts against the limiting portion 131. The circumferential sidewall 121 can abut against the surface of the sealing portion 122. When the pressure cap 130 is connected to the sheath seat 110, the pressure cap 130 can compress the circumferential sidewall 121, so that the circumferential sidewall 121 can generate frictional resistance between the pressure cap 130 and the sheath seat 110. This at least partially counteracts the tendency of the circumferential sidewall 121 to deform toward the center, preventing the seal 120 from collapsing.

[0022] In one embodiment, the inner wall of the sheath seat 110 is provided with a step 112. Further, the step 112 can surround the inner wall of the sheath seat 110. The pressure cap 130 can compress the circumferential sidewall 121, causing the circumferential sidewall 121 and the step 112 to abut against each other at the upper limit of the axial direction of the sheath seat 110, while the sealing portion 122 seals the opening 111. The step 112 supports and positions the circumferential sidewall 121 so that the circumferential sidewall 121 can be compressed by the pressure cap 130. The circumferential sidewall 121 includes a connected first portion 1211 and a second portion 1212. For example, the first portion 1211 and the second portion 1212 can be an annular structure. The first portion 1211 is located on the side of the second portion 1212 closer to the pressure cap 130, and the sealing portion 122 is connected at the junction between the first portion 1211 and the second portion 1212. The height of the first portion 1211 is less than that of the second portion 1212. During the negative pressure suction process inside the guide sheath 1, the sealing part 122 contracts towards its own axis, while simultaneously pulling the circumferential sidewall 121, causing it to tilt. Specifically, under negative pressure, the shorter first part 1211 tilts towards the center, and the limiting part 131 restricts this tilting to prevent collapse. The longer second part 1212 tilts away from the axis of the seal 120, continuously abutting against the inner wall of the sheath seat 110, allowing the seal 120 to continuously abut against the step 112. This restricts the positional relationship between the seal 120 and the sheath seat 110, preventing the seal 120 from being drawn deeper into the sheath seat 110, thus improving stability and safety.

[0023] For further details, please refer to Figure 5 The height d1 of the first part 1211 can be 0.3 to 0.5 times the height d2 of the second part 1212, such as 0.3, 0.4, or 0.5 times, and is not limited thereto. The height ratio between the first part 1211 and the second part 1212 should not be too large or too small. If the height ratio is too small, the first part 1211 is too small and easily adheres to itself, the contact area between the limiting part 131 and the first part 1211 is too small, and the seal 120 may still collapse under negative pressure. If the height ratio is too large, the contact area between the second part 1212 and the inner wall of the sheath seat 110 is too small, and the second part 1212 may tilt significantly, causing the seal 120 to collapse. An appropriate height ratio makes it difficult for the circumferential sidewall 121 to detach from the limiting part 131 under radial inward contraction force, ensuring that the seal 120 can maintain a stable structure, ensuring that the tight fit between it and the sheath seat 110 and the gland 130 is not damaged, and improving the structural stability and sealing performance of the seal 120.

[0024] Preferably, the circumferential sidewall 121 has an annular structure, and its thickness t is 0.3 to 1 times the radius r of the sealing part 122. For example, 0.3 times, 0.6 times, or 1 times, etc., are not limited. This ratio should not be too large or too small. If the ratio is too small, the thickness of the circumferential sidewall 121 is too small, resulting in insufficient structural strength. An excessively thin circumferential sidewall 121 is prone to bending and collapse under stress, failing to stably surround the sealing part 122 and provide circumferential support. This leads to poor structural stability of the seal 120 and easily affects the sealing effect. If the ratio is too large, the excessively thick circumferential sidewall 121 is too rigid. When the circumferential sidewall 121 is squeezed by the pressure cap 130, it is difficult to produce a suitable deformation, failing to tightly fit the contact surface. This may create small gaps between the sidewall and the sheath seat 110 and the pressure cap 130, weakening the sealing performance. An appropriate ratio ensures that the circumferential sidewall 121 has sufficient structural strength to stably surround the sealing part 122, preventing collapse or bending under stress. At the same time, the sidewall retains a moderate deformation capacity, allowing it to deform smoothly when the gland 130 is pressed, tightly fitting the contact surfaces of the sheath seat 110 and the gland 130, effectively filling the gap between the sheath seat 110 and the gland 130, ensuring a sealing effect, and balancing the sealing performance, stability, and service life of the seal 120.

[0025] In the embodiments of this application, please refer to Figure 6 and Figure 7 The cap 130 has a through hole 132, which is suitable for inserting the dilator 200. The dilator 200 can extend into the insertion tube of the guide sheath 1. The dilator 200 can guide and support the insertion tube, preventing the hollow insertion tube from being crushed during insertion into the human body, thus improving the stability of the guide sheath 1 in use. Please refer to... Figure 8 The limiting portion 131 forms a through hole 132. When the expander 200 is inserted into the through hole 132, the limiting portion 131 is located between the limiting mating portion 123 and the expander 200. The expander 200 abuts against the limiting portion 131 in a direction close to the limiting mating portion 123. For example, the limiting mating portion 123 may be a circumferential sidewall 121. The limiting portion 131 extends around the central axis of the sheath seat 110, and the expander 200 is located on the side of the limiting portion 131 close to the central axis of the sheath seat 110. The expander 200 abuts against the limiting portion 131 radially outward, meaning the expander 200 generates an abutting force against the limiting portion 131 in a direction close to the limiting mating portion 123. This abutting force supports the limiting portion 131 in a radially outward direction, preventing the limiting portion 131 from deforming towards the side close to the central axis of the sheath seat 110. This allows the limiting part 131 to continuously provide support for the limiting mating part 123, further preventing the seal 120 from collapsing toward the center, thereby achieving the effect of the expander 200 supporting the limiting part 131 and the limiting part 131 supporting the limiting mating part 123.

[0026] In one implementation, please refer to Figure 7 The expander 200 may include a mounting connector 210 and a clip 220. The mounting connector 210 is fixed to the gland 130 by the clip 220. The clip 220 fixes the mounting connector 210 to the gland 130 and restricts the displacement of the mounting connector 210 in the axial direction (i.e., along the direction in which the gland 130 and the sheath 110 are assembled). Through the fixing action of the clip 220, the mounting connector 210 will not axially detach from the gland 130 or become axially loose due to external forces (such as slight shaking during the use of the expander 200), ensuring the relative position of the mounting connector 210 and the gland 130 is stable, thereby preventing the entire expander 200 from moving axially.

[0027] When the mounting connector 210 is fixed to the gland 130, the mounting connector 210 can be at least partially embedded in the through hole 132 and abut against the limiting part 131. After the mounting connector 210 is fixed to the gland 130 by the clip 220, it can be at least partially embedded in the through hole 132 formed by the limiting part 131 and abut against the limiting part 131. The mounting connector 210 embedded in the through hole 132 will form a radial support force on the limiting part 131, counteracting the force that the limiting part 131 may deform towards the center of the through hole 132 (i.e., the direction of the central axis of the sheath seat 110), and preventing the limiting part 131 from losing support and failing to stably abut against the circumferential sidewall 121 of the seal 120, thereby realizing the supporting function of the mounting connector 210 on the limiting part 131.

[0028] In the embodiments of this application, please refer to Figure 7 and Figure 8 The limiting part 131 can limit the mounting joint 210 along the axial direction of the sheath seat 110, so that the mounting joint 210 can be radially corresponding to the limiting part 131. For example, one of the limiting part 131 and the mounting joint 210 is provided with a positioning groove, and the other is provided with a positioning block. The positioning block can cooperate with the positioning groove to limit the mounting joint 210 and the limiting part 131 to be radially corresponding. The mounting joint 210 embedded in the through hole 132 will form a radial support force on the limiting part 131, which will counteract the force that the limiting part 131 may deform toward the center of the through hole 132 (i.e., the direction of the central axis of the sheath seat 110), thereby improving the structural stability of the seal 120.

[0029] In a more specific embodiment, the limiting part 131 has a first surface 1311, which is the surface of the limiting part 131 near the central axis. Along the radially outward direction of the sheath seat 110, the first surface 1311 is inclined from the proximal end to the distal end of the sheath seat 110. The outer periphery of the mounting joint 210 has a second surface 211, which corresponds to the first surface 1311, and the first surface 1311 and the second surface 211 abut against each other. Along the insertion direction of the mounting joint 210, the diameter of the through hole 132 gradually decreases. In other words, when the mounting joint 210 is inserted into a predetermined position within the through hole 132, the hole wall surrounding the through hole 132 can support the mounting joint 210 to prevent misalignment between the mounting joint 210 and the hole wall, ensuring that the mounting joint 210 can support itself, and further preventing the seal 120 from collapsing towards the center.

[0030] This application provides a guide sheath 1, please refer to... Figure 9 The guide sheath 1 includes a sheath handle 100 and an expander 200 as described above, the expander 200 being able to be inserted into the sheath handle 100. This gives the guide sheath 1 the beneficial effects of any of the aforementioned solutions, which will not be elaborated further here.

[0031] 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.

[0032] 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.

[0033] 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 sealing element is installed inside the sheath seat. The pressure cap has a limiting part, and the sealing element has a limiting mating part. The limiting part and the limiting mating part cooperate with each other. In the radial outward direction of the sheath handle, the limiting part abuts against the limiting mating part.

2. The sheath handle according to claim 1, characterized in that, The limiting part is provided to protrude relative to the pressure cover surface, the sealing member is provided with a circumferential sidewall, the limiting mating part is at least a portion of the circumferential sidewall, and the limiting part is located on the side of the circumferential sidewall near the central axis of the sheath seat.

3. The sheath handle according to claim 2, characterized in that, The sealing element further includes a sealing portion, the circumferential sidewall is connected to the sealing portion and is circumferentially disposed around the sealing portion, the circumferential sidewall is convex relative to the surface of the sealing portion toward the side close to the pressure cap and radially abuts against the limiting portion.

4. The sheath handle according to claim 3, characterized in that, The inner wall of the sheath seat is provided with a step, and the pressure cap can squeeze the circumferential side wall so that the circumferential side wall and the step abut against the upper limit of the axial direction of the sheath seat, while the sealing part seals the opening; The circumferential sidewall includes a first part and a second part connected together. The first part is located on the side of the second part closer to the cover. The sealing part is connected at the junction between the first part and the second part. The height of the first part is less than that of the second part.

5. The sheath handle according to claim 4, characterized in that, The height of the first part is 0.3 to 0.5 times the height of the second part; And / or, the circumferential sidewall is an annular structure, and the thickness of the circumferential sidewall is 0.3 to 1 times the radius of the sealing part.

6. The sheath handle according to claim 1, characterized in that, The cap has a through hole adapted to insert an expander. The limiting portion surrounds the through hole. When the expander is inserted into the through hole, the limiting portion is located between the limiting mating portion and the expander. The expander abuts against the limiting portion in a direction close to the limiting mating portion.

7. The sheath handle according to claim 6, characterized in that, The expander includes a mounting connector and a clip. The mounting connector is fixed to the pressure cap by the clip. When the mounting connector is fixed to the pressure cap, the mounting connector can be at least partially embedded in the through hole and abut against the limiting part.

8. The sheath handle according to claim 7, characterized in that, The limiting part can limit the mounting joint along the axial direction of the sheath seat, so that the mounting joint can be radially corresponding to the limiting part.

9. The sheath handle according to claim 8, characterized in that, The limiting part has a first surface, which is the surface of the limiting part near the central axis of the sheath seat. In the radial outward direction of the sheath seat, the first surface is inclined from the proximal end to the distal end of the sheath seat. The outer periphery of the mounting joint has a second surface, which is correspondingly disposed to the first surface, and the first surface and the second surface abut against each other.

10. A guiding sheath, characterized in that, The guide sheath includes a sheath handle and an expander as described in any one of claims 1-9, the expander being insertable into the sheath handle.

Images