Delivery sheath and delivery system

Abstract

The present invention belongs to the technical field of medical devices, and particularly relates to a delivery sheath and a delivery system having the same. The delivery sheath in the present invention includes a sheath body and a delivery handle connected to and communicating with the proximal end of the sheath body. Among them, a sealing assembly is provided inside the delivery handle. The inside of the sealing assembly has a channel. At least one of the proximal end and the distal end of the sealing assembly is recessed into the inside of the sealing assembly to form a cavity, and the cavity communicates with the channel to penetrate through the proximal end and the distal end of the sealing assembly. According to the delivery sheath of the present invention, the sealing effect of the delivery sheath can be effectively guaranteed during the process of establishing a passage for other interventional devices, preventing the occurrence of leakage phenomena, and improving the safety and reliability of equipment operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a delivery sheath tube and a delivery system having the same. Background Art

[0002] During medical procedures such as cardiovascular interventional therapy or angiography, a delivery sheath tube is usually used to establish a passage for a catheter, a guide wire, a coil, a stent, a occluder, a filter retrieval device or other interventional instruments to enter the blood vessel. The use of the delivery sheath makes the operation more convenient, facilitates the introduction of instruments, improves the operation efficiency, reduces intraoperative blood vessel injury, and prevents blood loss. During the process of establishing a passage for interventional instruments by the existing delivery sheath tube, due to poor sealing effect, blood leakage is likely to occur, which is not convenient for doctors' operation, is not conducive to the safety of the operation, and cannot effectively meet the clinical use requirements. Summary of the Invention

[0003] The purpose of the present invention is to at least solve the problem of poor sealing effect of the delivery sheath tube during the process of establishing a passage for interventional instruments.

[0004] One aspect of the present invention provides a delivery sheath tube, which includes a sheath tube body and a delivery handle connected to and communicating with the proximal end of the sheath tube body. Wherein, a sealing component is arranged inside the delivery handle, a channel is formed inside the sealing component, and at least one of the proximal end and the distal end of the sealing component is recessed towards the inside of the sealing component to form a cavity, and the cavity communicates with the channel to penetrate through the proximal end and the distal end of the sealing component.

[0005] According to the delivery sheath tube of the present invention, by arranging a sealing component inside the delivery handle, and the inside of the sealing component has a channel, and at least one of the proximal end and the distal end of the sealing component is recessed towards the inside of the sealing component to form a cavity, and the cavity communicates with the channel to penetrate through the proximal end and the distal end of the sealing component. Wherein, on the one hand, this channel is used for the penetration of interventional instruments; when the interventional instrument penetrates into or out of the sealing component, the interventional instrument will impact and drive the sealing component to deform. This cavity is for the sealing component to have a deformation space and be able to disperse the impact force after deformation, so that the part of the interventional instrument in contact with the sealing component can deform, avoiding the overall structure of the sealing component deforming relative to the delivery handle, resulting in poor sealing effect and bleeding phenomenon. Therefore, by using the delivery sheath tube of the present invention, the sealing effect of the delivery sheath tube during the process of establishing a passage for interventional instruments can be effectively guaranteed, the occurrence of blood leakage can be prevented, the convenience and reliability in the clinical operation process can be improved, and further the operation risk can be reduced and the safety of the clinical operation can be improved.

[0006] In addition, according to the delivery sheath tube of the present invention, it may also have the following additional technical features:

[0007] In some embodiments of the present invention, the sealing assembly includes a first seal and a second seal. The proximal end of the first seal abuts against the distal end of the second seal. The channel includes a first through hole and a second through hole. The first through hole is provided on the first seal, and the second through hole is provided on the second seal. The first through hole and the second through hole communicate with each other.

[0008] In some embodiments of the present invention, the cavity includes a first cavity or / and a second cavity. The first seal includes a first circumferential portion and a first bottom plate portion. The first bottom plate portion is disposed on the end face of the first circumferential portion facing the second seal. The first bottom plate portion and the first circumferential portion enclose the first cavity. The first through hole is provided on the first bottom plate portion; or / and

[0009] The second seal includes a second circumferential portion and a second bottom plate portion. The second bottom plate portion is disposed on the end face of the second circumferential portion facing the first seal. The second bottom plate portion and the second circumferential portion enclose the second cavity. The second through hole is provided on the second bottom plate portion.

[0010] In some embodiments of the present invention, the first seal further includes a first boss. The first boss is disposed on the end face of the first circumferential portion away from the second seal. The first boss protrudes from the outer wall of the first circumferential portion or the first boss is flush with the outer wall of the first circumferential portion.

[0011] In some embodiments of the present invention, a first groove is further provided on the first boss.

[0012] In some embodiments of the present invention, the second seal further includes a second boss. The second boss is disposed on the end face of the second circumferential portion away from the first seal. The second boss protrudes from the outer wall of the second circumferential portion or the second boss is flush with the outer wall of the second circumferential portion.

[0013] In some embodiments of the present invention, a second groove is further provided on the second boss.

[0014] In some embodiments of the present invention, a first fixing portion is provided on the first seal, and a second fixing portion is provided on the second seal. The first fixing portion and the second fixing portion are cooperatively fixed.

[0015] In some embodiments of the present invention, the delivery handle further includes a connecting seat and a rear end cap. The proximal end of the sheath body communicates with the distal end of the connecting seat. The proximal end of the connecting seat is connected to the rear end cap. An installation cavity is provided between the proximal end of the connecting seat and the rear end cap. The sealing assembly is disposed in the installation cavity and is in close fit with the proximal end of the connecting seat and the rear end cap.

[0016] Another aspect of the present invention further provides a delivery system having the delivery sheath tube according to any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0018] Figure 1 is an exploded structural schematic diagram of a delivery sheath tube in an embodiment of the present invention;

[0019] Figure 2 is Figure 1 a partial cross-sectional structural schematic diagram of the delivery sheath tube in;

[0020] Figure 3 is Figure 1 a structural schematic diagram of the sealing assembly in;

[0021] Figure 4 is Figure 3 a structural schematic diagram of the sealing assembly from another perspective in.

[0022] The reference numerals in the drawings are represented as follows:

[0023] 100: delivery sheath tube;

[0024] 101: delivery handle, 10: connecting seat, 11: connecting seat body, 12: first connection end, 13: second connection end, 14: exhaust port, 15: first connection channel;

[0025] 20: sheath body;

[0026] 30: rear end cap, 31: second connection channel;

[0027] 40: Sealing assembly, 41: First seal, 411: First cavity, 412: First circumferential portion, 413: First bottom plate portion, 414: First through hole, 415: First boss, 416: First groove, 417: First fixing portion, 418: Cutout, 42: Second seal, 421: Second cavity, 422: Second circumferential portion, 423: Second bottom plate portion, 424: Second through hole, 425: Second boss, 426: Second groove, 427: Second fixing portion, 51: Mounting bevel, 21: Bell mouth;

[0028] 50: Front end cover;

[0029] 60: Connecting pipe;

[0030] 70: Three-way valve. Detailed implementation manners

[0031] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0032] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing" and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0033] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms used herein do not imply an order or sequence. Therefore, the first element, component, region, layer or section discussed below may be referred to as the second element, component, region, layer or section without departing from the teachings of the exemplary embodiments.

[0034] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. Such relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure is flipped, an element described as "below" or "beneath" other elements or features will then be oriented as "above" or "over" other elements or features. Thus, the exemplary term "below" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are accordingly interpreted.

[0035] For ease of description, the following description uses the terms "proximal end" and "distal end", where the "proximal end" refers to the end closer to the operator, and the "distal end" refers to the end farther from the operator. The phrase "axial direction" should be understood in this patent to represent the direction in which the interventional instrument is advanced and withdrawn, and the direction perpendicular to the "axial direction" is defined as the "radial direction".

[0036] An embodiment of the present invention provides a delivery sheath 100. Figure 1 It is a schematic exploded view of the delivery sheath 100 in an embodiment of the present invention. Figure 2 is Figure 1 A partial cross-sectional structural view of the delivery sheath 100 therein. As Figure 1 and Figure 2 shown, the delivery sheath 100 in this embodiment includes a sheath body 20 and a delivery handle 101. The proximal end of the sheath body 20 is connected to and communicates with the delivery handle 101.

[0037] In this embodiment, the delivery handle 101 of the delivery handle includes a sealing assembly 40. The proximal end and the distal end of the sealing assembly 40 both recess inwardly towards the inside of the sealing assembly 40, forming a first cavity 411 and a second cavity 421. The inside of the sealing assembly 40 has a channel 44 for the penetration and withdrawal of the interventional instrument. The first cavity 411, the channel 44, and the second cavity 421 communicate with each other to penetrate through the proximal end and the distal end of the sealing assembly 40. In other embodiments, at least one of the proximal end and the distal end of the sealing assembly 40 recesses inwardly towards the inside of the sealing assembly 40.

[0038] In this embodiment, the maximum inner diameter of the first cavity 411 and the maximum inner diameter of the second cavity 421 are both greater than the maximum inner diameter of the channel 44. It should be noted that the first cavity 411, the second cavity 421, and the channel can be cylindrical or other irregular shapes. When they are irregular shapes, the maximum inner diameter refers to the maximum length in the direction perpendicular to the conveying direction. The channel 44 with a smaller maximum inner diameter can be used for the intervention device to pass through, avoiding a larger inner diameter and causing blood leakage during the insertion or extraction of the intervention device. The first cavity 411 and the second cavity 421 have a larger maximum inner diameter, which can provide a larger deformation space.

[0039] The delivery handle 101 of the handle further includes a connection seat 10 and a rear end cover 30. A first connection channel 15 is provided in the connection seat 10, and an exhaust port 14 communicating with the first connection channel 15 is also provided in the connection seat 10. The sheath body 20 is provided at one end of the connection seat 10 and is connected to the first connection channel 15 in communication. The rear end cover 30 is provided with a second connection channel 31. The rear end cover 30 is provided at the other end of the connection seat 10. An installation cavity is further included between the rear end cover 30 and the connection seat 10. The sealing assembly 40 is disposed in the installation cavity. The outer peripheral surface of the sealing assembly 40 is in close fit and sealed connection with the inner wall surface of the installation cavity. The sealing assembly 40 is provided with a channel for communicating the first connection channel 15 and the second connection channel 31. Among them, the first cavity 411 is disposed at a position close to the first connection channel 15, and the second cavity 421 is disposed at a position close to the second connection channel 31. In other embodiments, as long as the sealing assembly 40 can be disposed in the delivery handle 101 and the sealing assembly 40 can ensure the sealing performance of the delivery handle 101, other structures in the delivery handle can be set according to different needs.

[0040] According to the delivery sheath 100 in the present invention, by arranging a sealing assembly 40 between the connection base 10 and the rear end cover 30, and the sealing assembly 40 is provided with a channel 44 for communicating the first connection channel 15 and the second connection channel 31, as well as a first cavity 411 arranged near the first connection channel 15 and a second cavity 421 arranged near the second connection channel 31. When the interventional device is inserted into the first connection channel 15 and the sheath body 20 through the second connection channel 31, the sealing assembly 40 deforms towards the direction of the first connection channel 15 under the impact force of the interventional device. The arranged first cavity 411 is a deformation space, so that the part of the interventional device in contact with the sealing assembly deforms in this deformation space. And the first cavity 411 is a cavity structure, which can disperse the impact force, can effectively reduce the overall deformation of the sealing assembly 40, thereby maintaining the sealing performance between the sealing assembly 40 and the installation cavity, and reducing the bleeding phenomenon caused by the poor sealing effect of the sealing assembly 40 during the insertion of the device; when the interventional device is withdrawn from the sheath body 20, the sealing assembly 40 deforms towards the direction of the second connection channel 31 under the impact force of the interventional device. The arranged second cavity 421 is a deformation space, so that the part of the interventional device in contact with the sealing assembly deforms in this deformation space. And the first cavity 411 is a cavity structure, which can disperse the impact force, can effectively reduce the deformation of the sealing assembly 40, thereby maintaining the sealing performance between the sealing assembly 40 and the installation cavity, and reducing the bleeding phenomenon caused by the poor sealing effect of the sealing assembly 40 during the withdrawal of the device. Thus, by using the delivery sheath 100 in the present invention, the sealing effect of the delivery sheath 100 can be effectively ensured during the process of establishing a passage for other interventional devices, preventing the occurrence of blood leakage, improving the convenience and reliability during the clinical operation process, further reducing the surgical risk, and improving the safety of the clinical operation.

[0041] As Figure 1 and Figure 2 shown, in some embodiments of the present invention, the connection base 10 includes a connection base body 11, and a first connection end 12 and a second connection end 13 respectively arranged at both ends of the connection base body 11. In order to ensure the airtightness of the connection between the sheath body 20 and the first connection channel 15, in some embodiments of the present invention, the delivery sheath 100 further includes a front end cover 50. The outer peripheral surface of the first connection end 12 is provided with an external thread, and the inside of the front end cover 50 is provided with an internal thread that can cooperate with the outer peripheral surface of the first connection end 12.

[0042] The proximal end of the sheath body 20 is fixed between the first connection end 12 and the front end cover 50, and the lumen in the sheath body 20 is communicated with the first connection channel 15. In Figure 1Among them, the proximal end of the sheath tube body 20 includes a flared mouth 21. The way the proximal end of the sheath tube body 20 penetrates into the front end cap 50 is that the distal end of the sheath tube body 20 penetrates into the proximal end of the front end cap 50 until the flared mouth 21 abuts against the opening of the front end cap 50. The flared mouth 21 is fixed between the front end cap 50 and the first connection end 12, and the front end cap 50 and the first connection end 12 are connected by screw fit. In order to ensure the coaxiality of the first connection channel 12 and the lumen in the sheath tube body 20, the distal end of the front end cap 50 is provided with an installation inclined surface 51 for positioning the flared mouth 21 at the proximal end of the sheath tube body 20, so as to ensure the coaxiality of the sheath tube body 20 and the first connection channel 15 and ensure the smooth progress of the penetration process of other interventional instruments. In other embodiments of the present invention, the proximal end of the sheath tube body 20 can also be directly inserted into the first connection channel 15, or other methods can be used to connect the sheath tube body 20 and the first connection end 12. The specific connection form is not limited, as long as it can ensure that the lumen of the sheath tube body 20 is connected to the first connection channel 15 and ensure airtightness.

[0043] The outer peripheral surface of the second connection end 13 of the connection seat 10 is also provided with an external thread, and the inside of the rear end cap 30 is provided with an internal thread matching the outer peripheral surface of the second connection end 13. The second connection end 13 and the rear end cap 30 are also connected by screw fit. After the second connection end 13 and the rear end cap 30 are connected, an installation cavity for installing the sealing assembly 40 is formed between the second connection end 13 and the rear end cap 30. The outer peripheral surface of the sealing assembly 40 is hermetically connected to the inner wall surface of the installation cavity, so as to ensure the sealing performance of the delivery sheath tube 20 and prevent blood from flowing out from the gap between the outer peripheral surface of the sealing assembly 40 and the inner wall surface of the installation cavity. Among them, during the use of the delivery sheath tube 100, the end cap at the proximal end of the delivery sheath tube 100 is the rear end cap 30, and the end cap at the distal end of the delivery sheath tube 100 is the front end cap 50.

[0044] An exhaust port 14 is provided on the connection seat body 11, and the exhaust port 14 is communicated with the first connection channel 15, so that the gas in the delivery sheath tube 20 can be discharged through the exhaust port 14 during the insertion and extraction of other interventional instruments into and out of the delivery sheath tube 20, preventing gas from entering the patient's blood during the treatment process and ensuring the normal flow of blood.

[0045] When the delivery sheath tube 20 establishes a passage for interventional instruments such as coils, occluders, filters, stents, etc. during the operation, the interventional instrument is inserted into the inside of the delivery sheath tube 100 from the proximal end of the delivery sheath tube 100, that is, from the side of the rear end cap 30. Other interventional instruments sequentially pass through the second connection channel 31, the sealing assembly 40, the first connection channel 15 and the sheath tube body 20, so as to reach the diseased part.

[0046] In some embodiments of the present invention, the delivery sheath 100 further includes a connecting tube 60 and a three-way valve 70. One end of the connecting tube 60 communicates with the exhaust port 14, and the other end of the connecting tube 60 communicates with the three-way valve 70, so that the gas in the delivery sheath 100 can be effectively discharged through the connecting tube 60 and the three-way valve 70. Preferably, the connecting tube 60 is a flexible tube, such as a rubber tube, so as to facilitate adjusting the placement position of the three-way valve 70.

[0047] Figure 3 For Figure 1 the schematic structural view of the sealing assembly 40 in Figure 4 For Figure 3 the schematic structural view of the sealing assembly 40 from another perspective in. As Figure 3 And Figure 4 shown, in some embodiments of the present invention, the sealing assembly 40 includes a first seal 41 and a second seal 42. The first seal 41 is provided with a first cavity 411 (see Figure 2 ), and the first seal 41 is further provided with a first through hole 414 penetrating through the first cavity 411. The second seal 42 is provided with a second cavity 421 (see Figure 2 ), and the second seal 42 is further provided with a second through hole 424 penetrating through the second cavity. Wherein, the first through hole 414 and the second through hole 424 communicate with each other to form a channel 44 (see Figure 2 ). In other embodiments, the sealing assembly 40 may be an integral structure. In other embodiments, only one of the first seal 41 and the second seal 42 has a cavity structure.

[0048] By providing the first cavity 411 and the second cavity 421, it can effectively ensure that there is a cavity as a deformation space during the process of inserting and pulling out the interventional device into and from the delivery sheath 100. This deformation space can enable the part of the interventional device in contact with the sealing assembly (that is, the part near the first through hole 414 and the second through hole 424) to generate deformation within this deformation space, and the cavity structure can disperse the impact force, effectively reducing the deformation of the sealing assembly 40 as a whole relative to the delivery handle and ensuring the sealing effect inside the delivery sheath 100. Among them, in order to ensure that the first seal 41 and the second seal 42 have certain deformation performance, the first seal 41 and the second seal 42 can be made of materials with certain recoverable deformation functions, such as silica gel or silicone resin.

[0049] The first seal 41 and the second seal 42 can be set to have the same elastic modulus or different elastic moduli. The larger the value of the elastic modulus, the harder the seal and the less likely it is to deform. The elastic modulus of the first seal 41 can be set to be less than that of the second seal 42, so that the material of the first seal 41 is softer, making the passage of other interventional instruments stronger, and making the material of the second seal 42 at the proximal end harder. The second seal 42 is not easily deformed, ensuring the sealing performance.

[0050] In some embodiments of the present invention, the first seal 41 includes a first circumferential portion 412 and a first bottom plate portion 413. The first bottom plate portion 413 is disposed on the end face of the first circumferential portion 412 facing the second seal 42. The first bottom plate portion 413 is provided with a first through hole 414. The first circumferential portion 412 and the first bottom plate portion 413 together enclose a first cavity 411 (see Figure 2 ). The second seal 42 includes a second circumferential portion 422 and a second bottom plate portion 423. The second bottom plate portion 423 is disposed on the end face of the second circumferential portion 422 facing the first seal 41. The second bottom plate portion 423 is provided with a second through hole 424. The second circumferential portion 422 and the second bottom plate portion 423 together enclose a second cavity 421 (see Figure 2 ).

[0051] As Figure 3 and Figure 4 shown, the first cavity 411 of the first seal 41 and the second cavity 421 of the second seal 42 are both bowl-shaped structures. One end of the bowl-shaped structure is open, and the first bottom plate portion 413 and the second bottom plate portion 423 are arranged in a mutually attached manner.

[0052] During the process of the interventional instrument being inserted into the delivery sheath 100, the first bottom plate portion 413 and the second bottom plate portion 423 deform in the direction of the first cavity 411. Since the cavity structure of the first cavity 411 can provide a deformation space for the first bottom plate portion 413 and the second bottom plate portion 423 and can disperse the impact force, the impact force transmitted to the first circumferential portion 412 and the second circumferential portion 422 can be greatly weakened. It can prevent the entire sealing assembly from moving relative to the delivery handle in the installation cavity, enhance the sealing performance, and thus reduce the occurrence of blood leakage.

[0053] During the process of other interventional instruments being withdrawn from the delivery sheath 100, the first bottom plate portion 413 and the second bottom plate portion 423 deform in the direction of the second cavity 421. Since the cavity structure of the second cavity 421 can provide a deformation space for the first bottom plate portion 413 and the second bottom plate portion 423 and can disperse the impact force, the impact force transmitted to the first circumferential portion 412 and the second circumferential portion 422 can be greatly weakened. It can prevent the entire sealing assembly from moving relative to the delivery handle in the installation cavity, enhance the sealing performance, and thus reduce the occurrence of blood leakage.

[0054] Since the first bottom plate portion 413 and the second bottom plate portion 423 are arranged in contact with each other, when the second bottom plate portion 423 deforms towards the first cavity 411, the first bottom plate portion 413 can also offset a part of the force of the second bottom plate portion 423 towards the first cavity 411 under the impact force of the interventional device; or when the first bottom plate portion 413 deforms towards the second cavity 421, the second bottom plate portion 423 can also offset a part of the force of the first bottom plate portion 413 towards the second cavity 421 under the impact force of the interventional device.

[0055] In other embodiments of the present invention, the first through hole 414 on the first bottom plate portion 413 is in a shape of a straight line, and the second through hole 424 on the second bottom plate portion 423 is circular. When a sheath core, a guide wire or other interventional device passes through the sealing assembly 40, the circular through hole on the second bottom plate portion 423 can tightly wrap the catheter, the guide wire or other devices, so as to effectively prevent blood leakage. At the same time, the straight-line through hole on the first bottom plate portion 413 can provide good passability for the sheath core, the guide wire or other interventional devices to pass through, and has a certain activity space. When the sheath core, the guide wire or other devices are pulled out from the delivery sheath 100, the second seal 42 arranged in contact with the first seal 41 can provide good supporting force for the first seal 41, so as to facilitate the closing of the straight-line through hole of the first seal 41 and achieve a good sealing effect. When a small amount of blood oozes out, the second seal 42 can also block the small amount of blood at a second layer, so as to further reduce the occurrence of blood leakage. The shapes of the first through hole 414 and the second through hole 424 are not limited to this. In other embodiments of the present invention, the first through hole 414 and the second through hole 424 can also be arranged as a cross-shaped through hole and a rice-shaped through hole.

[0056] In other embodiments of the present invention, one of the first seal 41 and the second seal 42 can also be arranged in a structural form with bottom plate portions provided at both ends, and corresponding through holes allowing other interventional devices to pass through are provided on the bottom plate portions. Or, both the first seal 41 and the second seal 42 are arranged in a structural form with bottom plate portions provided at both ends, and corresponding through holes allowing interventional devices to pass through are provided on the bottom plate portions. The above structural forms can all achieve the purpose of solving the technical problems in this application.

[0057] In some embodiments of the present invention, the first seal 41 further includes a first boss 415, the first boss 415 is arranged on the end face of the first circumferential portion 412 facing the first connection channel 15, and the first boss 415 protrudes from the outer wall of the first circumferential portion 412. The second seal 42 further includes a second boss 425, the second boss 425 is arranged on the end face of the second circumferential portion 422 facing the second connection channel 31, and the second boss 425 protrudes from the outer wall of the second circumferential portion 422.

[0058] In some embodiments of the present invention, both the first seal 41 and the second seal 42 are engaged with the inner wall surface of the mounting cavity through the bosses, so as to achieve the sealing effect of the sealing assembly 40. Since the first boss 415 and the second boss 425 protrude from their respective corresponding circumferential portions, during the mating process of the sealing assembly 40 with the mounting cavity, only the first boss 415 and the second boss 425 are subjected to extrusion pressure and deformed, and the first bottom plate portion 413 and the second bottom plate portion 423 will not be deformed and further affect the deformation of the first through hole 414 and the second through hole 423, thus ensuring that the interventional instrument can be smoothly inserted into and withdrawn from the sealing assembly 40. In other embodiments, the first boss 415 may be flush with the outer side wall of the first circumferential portion 412, and the second boss 425 may be flush with the outer side wall of the second circumferential portion 422.

[0059] In some embodiments of the present invention, a first groove 416 is further provided on the end surface of the first boss 415, and a second groove 426 is further provided on the end surface of the second boss 425. During the connection process of the rear end cover 30 and the second connection end 13, the end surface of the first boss 415 is in contact with the second connection end 13, and the end surface of the second boss 425 is in contact with the rear end cover 30. The sealing assembly 40 is deformed by the extrusion of the rear end cover 30 and the second connection end 13, so as to discharge the gas in the first groove 416 and the second groove 426, and generate suction force between the first boss 415 and the second boss 425 and their respective corresponding end surfaces. The first groove 416 and the second groove 426 respectively form a sealing ring on their respective corresponding end surfaces, thus further ensuring the sealing effect between the outer peripheral surface of the sealing assembly 40 and the inner wall surface of the mounting cavity. In other embodiments, grooves may also be provided on the sides of the first boss 415 and the second boss 425.

[0060] In this embodiment, when both the first boss 415 and the second boss 425 are annular bosses, the first groove 416 and the second groove 426 are also annular grooves at the same time. In other embodiments, at least one of the first boss 415 and the second boss 425 includes a plurality of convex blocks, and the plurality of convex blocks are distributed on the outer periphery of the circumferential portion, and grooves may be formed between the plurality of convex blocks.

[0061] In some embodiments of the present invention, a first fixing portion 417 is provided on the first seal 41, and a second fixing portion 427 for matching with the first fixing portion 417 is provided on the second seal 42. Specifically, as Figure 3 and Figure 4As shown, the first fixing portion 417 is an extending end provided on the outer peripheral surface of the first circumferential portion 412 and facing the second seal 42, and the second fixing portion 427 is a groove provided on the outer peripheral surface of the second circumferential portion 422. The extending end can be inserted into the groove with a shape match, so as to connect and fix the first seal 41 and the second seal 42, make the first bottom plate portion 413 and the second bottom plate portion 423 fit closely, realize the axial and circumferential positioning of the first seal 41 and the second seal 42, and effectively prevent the first seal 41 and the second seal 42 from shifting. In addition, the first fixing portion 417 can also be a groove, and the second fixing portion 427 is an extending end that matches the shape of the groove.

[0062] In some embodiments of the present invention, a notch 418 is further provided on the outer peripheral surface of the first circumferential portion 412, so that when the first boss 415 is deformed by extrusion, there is sufficient deformation space to prevent further extrusion of the first circumferential portion 412 and ensure that the aperture of the first through hole 414 remains unchanged. Correspondingly, a notch can also be provided on the outer peripheral surface of the second circumferential portion 422.

[0063] On the other hand, the present invention also proposes a delivery system. The delivery system has the delivery sheath 100 in any one of the above embodiments, and further includes interventional devices such as a catheter, a guide wire or a stent. The interventional devices such as a catheter, a guide wire or a stent can sequentially pass through the second connection channel 31, the sealing assembly 40, and the first connection channel 15 and be inserted into the sheath body 20, and finally reach the patient's site.

[0064] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A delivery sheath, characterized in that, it comprises a sheath body and a delivery handle connected to and communicating with the proximal end of the sheath body. Wherein, a sealing assembly is arranged inside the delivery handle, and a channel is formed inside the sealing assembly. The sealing assembly includes a first seal and a second seal that axially abut against each other. The first seal includes a first circumferential portion and a first bottom plate portion. The first bottom plate portion is arranged on the end face of the first circumferential portion facing the second seal. The channel penetrates through the first bottom plate portion. The first seal further includes a first boss. The first boss is arranged on the end face of the first circumferential portion away from the second seal. The first boss protrudes from the outer wall of the first circumferential portion or the first boss is flush with the outer wall of the first circumferential portion. A first groove is further provided on the first boss.

2. The delivery sheath according to claim 1, characterized in that, the first seal is arranged at the distal end of the second seal, and the elastic modulus of the first seal is less than the elastic modulus of the second seal.

3. The delivery sheath according to claim 1, characterized in that, the proximal end of the first seal and the distal end of the second seal abut against each other. The channel includes a first through hole and a second through hole. The first through hole is arranged on the first seal, and the second through hole is arranged on the second seal. The first through hole and the second through hole communicate with each other.

4. The delivery sheath according to claim 1, characterized in that, the second seal includes a second circumferential portion and a second bottom plate portion. The second seal further includes a second boss. The second boss is arranged on the end face of the second circumferential portion away from the first seal. The second boss protrudes from the outer wall of the second circumferential portion or the second boss is flush with the outer wall of the second circumferential portion.

5. The delivery sheath according to claim 4, characterized in that, a second groove is further provided on the second boss.

6. The delivery sheath according to claim 4, characterized in that, the sealing assembly includes a cavity. The cavity includes a first cavity or / and a second cavity. The first bottom plate portion and the first circumferential portion enclose the first cavity; or / and the second bottom plate portion is arranged on the end face of the second circumferential portion facing the first seal, and the second bottom plate portion and the second circumferential portion enclose the second cavity.

7. The delivery sheath according to claim 1, characterized in that, the sealing assembly includes a cavity, and the maximum inner diameter of the cavity is greater than the maximum inner diameter of the channel.

8. The delivery sheath according to claim 1, characterized in that, a first fixing portion is provided on the first seal, and a second fixing portion is provided on the second seal. The first fixing portion and the second fixing portion are fixedly matched with each other.

9. The delivery sheath according to claim 1, characterized in that, The delivery handle further includes a connecting seat and a rear end cover. The proximal end of the sheath body communicates with the distal end of the connecting seat. The proximal end of the connecting seat is connected to the rear end cover. An installation cavity is provided between the proximal end of the connecting seat and the rear end cover. The sealing assembly is disposed in the installation cavity and is in close fit with the proximal end of the connecting seat and the rear end cover.

10. A delivery system, characterized in that, the delivery system includes the delivery sheath according to any one of claims 1 to 9.

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