A sealing and locking device

Abstract

The present invention relates to the field of medical devices, and particularly to a sealing and locking device, which includes an inner member, an outer member, and a sealing and locking mechanism. The sealing and locking mechanism is sleeved around the outer of the inner member and connected to the proximal region of the outer member; two sets of sliding structures are provided in the sealing and locking mechanism, and the sliding structures include a first set of sliding structures and a second set of sliding structures; wherein, the first set of sliding structures is located in the proximal region or outside the proximal region of the second set of sliding structures; after the first set of sliding structures achieves a mating state, it then drives and triggers the second set of sliding structures to form a sliding fit, so that the dual functions of sealing and locking between the inner member and the outer member can be quickly realized at any time and at any relative position between the two through a single one-step operation.

Description

[0001] The present invention belongs to the field of medical devices, and particularly relates to a sealing and locking device. Background Art

[0002] Currently, interventional therapy is an emerging treatment method between surgery and internal medicine, including endovascular intervention and non-vascular intervention. After more than 30 years of development, it has now become one of the three pillar disciplines together with surgery and internal medicine. Simply put, interventional therapy is a minimally invasive treatment method in which, without exposing the lesion by surgery, a tiny channel with a diameter of a few millimeters is made in the blood vessel or skin, or through the original human duct, and the lesion is locally treated under the guidance of imaging equipment (angiography machine, fluoroscope, CT, MR, B-ultrasound).

[0003] In the prior art, the delivery systems for minimally invasive interventional therapies for structural heart diseases, including atrial septal defect, ventricular septal defect, patent foramen ovale, patent ductus arteriosus, left atrial appendage occlusion, and atrial shunt, mainly consist of a delivery sheath, a loader, and a delivery cable. The function of the delivery sheath is to establish an access channel for the implant device; the main function of the loader is to facilitate the doctor to send the implant device into the delivery sheath; the main function of the delivery cable is to push and release the implant device through the channel established by the delivery sheath to the position where it needs to be implanted. The delivery cable passes through the loader, and the implant device is fixed at the free end of the delivery cable. Then, the cable is pulled to receive the implant device in the loader; then the loader is placed in the delivery sheath, and then the cable is pushed to deliver the implant device until the implant device reaches the position where it needs to be implanted; however, the delivery systems in the prior art have the following disadvantages in use: First, the cable can only move unidirectionally in the delivery sheath, and the cable can only be further pushed forward at a preset position, resulting in the inability to push at the required position, and the locking position of the cable and the delivery sheath is fixed or can only be slightly adjusted within a local range; Second, the existing locking on the market is achieved by sealing and locking, with poor locking effect and small locking force, and it is very easy to have the situation of locking failure or loosening, so that there is a risk of loosening and inability to accurately position before the implant device reaches the target position, and this structure puts higher requirements on the locking structure; Third, using the seal as the lock, the locking force is weak, and it is easier to cause the sealing effect between the cable and the delivery sheath to be unstable, and there is a risk of leakage.

[0004] Therefore, in the process of interventional therapy surgery, how to ensure that the implant device can be repeatedly pushed and retracted, and at the same time ensure that the delivery system can provide good sealing, locking, and free positioning, making the surgical operation process simple and convenient, has become an urgent problem to be solved at present. Summary of the Invention

[0005] In view of the above and others, the object of the present invention is to overcome the deficiencies of the prior art.

[0006] According to an embodiment in the application of atrial septal defect surgery, the present invention can provide a sealing and locking device for patients with structural heart disease who require interventional treatment, which can solve the problems of long installation time and complex installation process of the built-in component during the interventional surgery, and the built-in component is prone to loosen during the processes of pushing, rotating and moving in the external component, resulting in the displacement of the implanted instrument, thereby improving the surgical safety.

[0007] According to one aspect of the present invention, a sealing and locking device includes a built-in component, an external component, and a sealing and locking mechanism. The sealing and locking mechanism is sleeved around the built-in component and connected to the proximal region of the external component; two sets of sliding fit structures are arranged in the sealing and locking mechanism, and the sliding fit structures include a first set of sliding fit structures and a second set of sliding fit structures; wherein, the first set of sliding fit structures is located in the proximal region or outside the proximal region of the second set of sliding fit structures; after the first set of sliding fit structures is in a mating state, it drives and triggers the second set of sliding fit structures to form a sliding fit, so that the dual functions of sealing and locking between the built-in component and the external component at any time and any relative position of the two can be quickly realized through a single-step operation.

[0008] In one embodiment, the sealing and locking mechanism includes a sealing structure, a limiting structure located at the distal region of the sealing structure, a locking structure located at the proximal region of the sealing structure, a base, and a base fitting connected to the base in a matching manner; a first surface is provided on the base fitting, a second surface is provided on the locking structure, and the first surface and the second surface cooperate to form the first set of sliding fit structures; a third surface is provided on the base, a fourth surface is provided on the locking structure, and the third surface and the fourth surface cooperate to form the second set of sliding fit structures.

[0009] In one embodiment, when the built-in part and the external part gradually form the dual functions of sealing and locking, the seal-locking mechanism has a first form, a second form, and a third form; in the first form, the base fitting and the base cooperate to drive the first surface and the second surface to axially approach and touch each other to form the first set of sliding fitting structures, and at this time, both the sealing structure and the locking structure are in a natural state; in the second form, the anti-radial extrusion performance of the distal end of the locking structure is greater than or equal to the anti-radial extrusion performance of the sealing structure, so that the base fitting and the base further drive the third surface and the fourth surface to axially approach each other but they do not touch. At this time, the second surface is not radially extruded and no locking state is formed, the sealing structure is gradually compressed, the sealing structure deforms and gradually forms a sealing state; in the third form, the base fitting and the base further drive the third surface and the fourth surface to axially approach and touch each other to form the second set of sliding fitting structures. At the same time, the second surface is radially compressed so that the first surface and the second surface further axially approach each other, and the limiting structure restricts the axial displacement of the sealing structure. The sealing structure is partially or completely compressed. At this time, the seal-locking mechanism preliminarily seals and locks the built-in part; subsequently, after the base fitting and the base further drive the first surface and the second surface, and the third surface and the fourth surface to axially approach each other respectively, when the sealing structure reaches the compression limit, the seal-locking mechanism finally realizes the dual functions of sealing and locking the built-in part and the external part.

[0010] In one embodiment, the locking structure is cylindrical or prismatic or wedge-shaped.

[0011] In one embodiment, at least one of the first surface and the second surface is an inclined surface, and the angle a between it and the proximal direction of the central axis of the seal-locking device satisfies: 90° < a < 180°; at least one of the third surface and the fourth surface is an inclined surface, and the angle b between it and the proximal direction of the central axis of the seal-locking device satisfies: 0° < b < 90°.

[0012] In one embodiment, both the first surface and the second surface are parallel inclined surfaces; both the third surface and the fourth surface are parallel inclined surfaces; on any cross-section passing through the central axis of the seal-locking device, the angle c between the first set of sliding fitting structures and the second set of sliding fitting structures satisfies: 60° ≤ c ≤ 90°.

[0013] In one embodiment, the inner diameter d of the sealing structure 1 , the axial length L of the sealing structure 1 , the stroke △L between the third surface and the fourth surface 2 , the outer diameter D of the built-in part 5Satisfy the mathematical relationship: △L 2 × (D 1 2 - d 1 2 ) ≥ (L 1 - △L 2 ) × d 1 2 ; △L 2 × (D 1 2 - d 1 2 ) ≥ (L 1 - △L 2 ) × (d 1 2 - D 5 2 ).

[0014] In one embodiment, in the natural state, the axial length L of the sealing structure 1 , the outer diameter D of the sealing structure 1 Satisfy the mathematical relationship: 0 < L 1 / D 1 ≤ 0.5; or, L 1 / D 1 ≥ 2.

[0015] In one embodiment, the overall height H of the third surface 3 , the overall height H of the fourth surface 2 , the diameter d of the locking structure 2 , the outer diameter D of the built-in part 5 Satisfy the mathematical relationship: 2(H 3 + H 2 ) > d 2 - D 5 .

[0016] In one embodiment, the distance H from the upper end surface of the third surface to the axis of the sealing and locking device 2 , , the diameter d of the base through hole 3 , the diameter d of the locking structure 2 Satisfy the mathematical relationship: d 3 < 2H 2 , - d 2 .

[0017] In one embodiment, an initial limiting structure is provided between the base and the base fitting, and the initial limiting structure enables the base and the base fitting to always be in a state to be assembled in any state during the process of approaching or separating from each other.

[0018] In one embodiment, during pre-installation, the implant device is located at the distal end of the inner member and is restricted between the outer member and the inner member.

[0019] In one embodiment, a first limiting member is provided on the distal end face of the sealing structure, and the first limiting member is fixedly or non-fixedly connected to the base; alternatively, a second limiting member is provided on the proximal end face of the sealing structure, the second limiting member is non-fixedly connected to the base, and the first limiting member and / or the second limiting member can axially move with the sealing structure.

[0020] In one embodiment, an exhaust structure is provided in a distal region of the base near the sealing structure, and the exhaust structure and the portion of the base connected to the exhaust structure are transparent or semi-transparent.

[0021] In one embodiment, the base and the outer member are fixedly connected.

[0022] In one embodiment, an external thread is provided in a proximal region of the base, and an internal thread that mates with the external thread is provided in a proximal region of the base fitting; after the distal end of the external thread and the distal end of the base fitting are connected by a snap connection to form circumferential positioning, the locking structure restricts axial displacement of the inner member through the cooperation of the external thread and the internal thread.

[0023] In one embodiment, the sealing structure is made of an elastic material, and the elastic material has axial compressibility.

[0024] In one embodiment, the locking structure sequentially includes a cone section and a cylinder section from the proximal end to the distal end, and the hole diameter of the cone section gradually decreases towards the end away from the cylinder section; circumferentially and uniformly spaced slots are provided in a proximal region of the locking structure, and the spaced slots divide the locking structure into a plurality of clamping pieces, and the anti-radial extrusion performance of the distal end of the clamping piece is greater than or equal to the anti-radial extrusion performance of the sealing structure; the ratio n of the length of the clamping piece to the length of the locking structure satisfies: 0.5 ≤ n ≤ 1.

[0025] In one embodiment, the diameter d of the locking structure 2 , the outer diameter D of the inner member 5 , the number of the dividing slots is n, and the arc length w of each dividing slot satisfy the mathematical relationship: 3(d 2 - D 5 ) > nw.

[0026] Compared with the prior art, the advantages of the present invention at least include the following:

[0027] 1. At present, during cardiac interventional surgery, the delivery cable in the delivery system can only move unidirectionally in the delivery sheath, and the locking position of the cable and the delivery sheath is fixed or can only be adjusted in a local range. The locking effect is poor and the locking force is small, which easily leads to locking failure or loosening, thereby causing the implanted device to be at risk of falling off before reaching the target position, and this structure puts higher requirements on the locking structure. In addition, the sealing effect of the cable and the delivery sheath is unstable and there is a risk of leakage. Different from the prior art, in one embodiment of the present invention, two groups of sliding structures are arranged in the sealing locking mechanism, and the sliding structures include a first group of sliding structures and a second group of sliding structures. The first group of sliding structures is located in the proximal region or near the second group of sliding structures. outside the end area; after the first group of sliding structures achieves the mating state, it then drives and triggers the second group of sliding structures to form a sliding fit, so that the dual functions of sealing and locking of the built-in component and the external component at any time and in any relative position of the two can be quickly achieved through a single one-step operation; during the entire sealing and locking process, the built-in component and the external component can be pushed synchronously after being triggered in succession by the two groups of sliding structures, and the two can achieve synchronous stillness and synchronous movement; after the conveying system reaches the target position, the built-in component and the external component can achieve bidirectional movement toward the proximal end or the distal end as needed, so as to achieve precise positioning; in addition, the sealing and locking of the built-in component and the external component are reversible, and the locking position and locking time of the two can be adjusted arbitrarily according to needs, which increases the locking strength and improves the locking effect.

[0028] 2. Different from the prior art, in an embodiment of the present invention, a sealing and locking mechanism is provided outside the built-in part, and the sealing and locking mechanism has a first form, a second form, and a third form; in the first form, the base fitting and the base cooperate to drive the first surface and the second surface to axially approach and touch each other to form the first set of sliding fit structures. At this time, the sealing structure and the locking structure are in a natural state. After the first surface and the second surface touch each other, the locking structure is further operated, which provides a basis for the fourth surface of the locking structure to continue to touch the third surface of the base; in the second form, the anti-radial extrusion performance of the distal end of the locking structure is greater than or equal to the anti-radial extrusion performance of the sealing structure, so that the base fitting and the base further drive the third surface and the fourth surface to axially approach each other but they do not touch. At this time, the second surface is not radially extruded and no locking state is formed, and the sealing structure is gradually compressed, deformed and gradually forms a sealing state; in the third form, the base fitting and the base further drive the third surface and the fourth surface to axially approach and touch each other to form a second set of sliding fit structures. At the same time, the second surface is radially compressed so that the first surface and the second surface further axially approach each other, and the limiting structure restricts the axial displacement of the sealing structure, and the sealing structure is partially or completely compressed. At this time, the sealing and locking mechanism preliminarily seals and locks the built-in part. During the whole process, the second set of sliding fit structures cooperate with the first set of sliding fit structures to further compress the sealing structure; subsequently, the base fitting and the base further drive the first surface and the second surface, and the third surface and the fourth surface to axially approach each other respectively. During the whole process, since at least one surface of the second set of sliding fit structures and the first set of sliding fit structures is an inclined surface, it can be ensured that the first surface and the second surface, and the third surface and the fourth surface further approach each other, so that the sealing structure is further compressed to reach the maximum compression limit, and the built-in part and the external part finally realize the dual functions of sealing and locking.

[0029] 3. Different from the prior art, in an embodiment of the present invention, at least one of the first surface and the second surface is an inclined surface, and the angle a between it and the proximal direction of the central axis of the sealing and locking device satisfies: 90° < a < 180°; at least one of the third surface and the fourth surface is an inclined surface, and the angle b between it and the proximal direction of the central axis of the sealing and locking device satisfies: 0° < b < 90°; the advantage of such a design is that: it can be ensured that after the first surface and the second surface, or the third surface and the fourth surface touch each other respectively, when the locking structure is further operated, the first surface, the second surface, or the third surface and the fourth surface can still further approach each other until the sealing structure reaches the maximum compression limit, ensuring that the built-in part and the external part fully realize the sealing and locking functions.

[0030] 4. Different from the prior art, in an embodiment of the present invention, the first surface and the second surface are both parallel inclined planes; the third surface and the fourth surface are both parallel inclined planes; on any cross-section passing through the central axis of the sealing and locking device, the included angle c between the second set of sliding and mating structures and the first set of sliding and mating structures satisfies: 60° ≤ c ≤ 90°. Such a design can ensure that the second set of sliding and mating structures and the first set of sliding and mating structures cooperate with each other to move, so as to ensure that the sealing structure can be further compressed until the maximum compression limit is reached.

[0031] 5. Different from the prior art, in an embodiment of the present invention, the inner diameter d of the sealing structure 1 , the axial length L of the sealing structure 1 , the stroke ΔL between the first surface and the second surface 2 , the outer diameter D of the built-in part 5 satisfy the mathematical relationship: ΔL 2 (D 1 2 - d 1 2 ) ≥ (L 1 - ΔL 2 ) d 1 2 ; ΔL 2 (D 1 2 - d 1 2 ) ≥ (L 1 - ΔL 2 ) (d 1 2 - D 5 2 ), which can ensure that the sealing structure is fully compressed, so that the built-in part and the external part are fully sealed and locked.

[0032] 6. Different from the prior art, in an embodiment of the present invention, in the natural state, the axial length L of the sealing structure 1 , the outer diameter D of the sealing structure 1 satisfy the mathematical relationship: 0 < L 1 / D 1 ≤ 0.5; or, L 1 / D 1 ≥ 2; which can ensure that the sealing structure exerts the maximum sealing effect and prevent it from entering the base through hole along with the built-in part.

[0033] 7. Different from the prior art, in an embodiment of the present invention, the overall height H of the first surface 3 , the overall height H of the second surface 2 , the diameter d of the locking structure 2 , the outer diameter D of the built-in part5 Satisfy the mathematical relationship: 2(H 3 +H 2 ) > d 2 -D 5 ; The distance H from the upper end face of the second surface to the central axis of the sealing and locking device 2 , , the diameter d of the through hole of the base 3 , the diameter d of the locking structure 2 Satisfy the mathematical relationship: d 3 <2H 2 , -d 2 ; It can ensure that during the process of the third surface and the fourth surface approaching each other, the fourth surface can touch the third surface, so as to better enable the sealing and locking mechanism to finally realize the dual functions of sealing and locking of the built-in part and the external part in the third form.

[0034] 8. Different from the prior art, in an embodiment of the present invention, the diameter d of the locking structure 2 , the outer diameter D of the built-in part 5 , the number of the dividing grooves is n, and the arc length of each dividing groove is w, satisfying the mathematical relationship: 3(d 2 -D 5 ) > nw; It can ensure that the clamping piece fully locks the built-in part and prevent the built-in part from still being in a loose state when the clamping piece reaches the maximum contraction limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall state of the sealing and clamping device including the built-in part, the external part, and the sealing and locking mechanism.

[0036] Figure 2 It is a schematic diagram of the sealing and locking mechanism in a natural state and in a state to be assembled.

[0037] Figure 3 It is a schematic diagram of the state when the first set of sliding fit structures in the sealing and locking mechanism is formed.

[0038] Figure 4 It is a schematic diagram of the state when the third surface and the fourth surface of the sealing and locking mechanism approach each other axially.

[0039] Figure 5 It is a schematic diagram of the state when the second set of sliding fit structures in the sealing and locking mechanism is formed.

[0040] Figure 6 It is a schematic diagram of the overall state of the locking structure.

[0041] The names of the parts indicated by the numbers in the accompanying drawings are as follows: 1-internal component, 2-external component, 3-sealing and locking mechanism, 4-first group of sliding structures, 41-first surface, 42-second surface, 5-second group of sliding structures, 51-third surface, 52-fourth surface, 6-sealing structure, 7-limiting structure, 8-locking structure, 81-base, 82-base matching part, 83-conical section, 84-column section, 85-partitioning groove, 86-clip, 9-exhaust structure. DETAILED DESCRIPTION

[0042] The invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0043] In the present invention, the proximal end refers to the end close to the surgical operator, and the distal end refers to the end far away from the surgical operator.

[0044] Embodiment 1:

[0045] A sealing locking device, such as Figure 1 As shown, it includes an internal component 1, an external component 2, and a sealing locking mechanism 3. The sealing locking mechanism 3 is sleeved outside the internal component 1 and connected to the proximal region of the external component 2; two sets of sliding structures are arranged in the sealing locking mechanism 3, such as Figures 2 to 5 As shown, the sliding structure includes a first group of sliding structures 4 and a second group of sliding structures 5; wherein, the first group of sliding structures 4 is located in the proximal area or outside the proximal area of ​​the second group of sliding structures 5; after the first group of sliding structures 4 achieves the mating state, it then drives and triggers the second group of sliding structures 5 to form a sliding fit, thereby quickly achieving the dual functions of sealing and locking of the internal component 1 and the external component 2 at any time and in any relative position through a single one-step operation.

[0046] In this embodiment, Figures 2 to 5 As shown, the sealing locking mechanism 3 includes a sealing structure 6, a limiting structure 7 located in the distal area of ​​the sealing structure 6, a locking structure 8 located in the proximal area of ​​the sealing structure 6, a base 81, and a base mating member 82 connected to the base; the base mating member 82 is provided with a first surface 41, the locking structure 8 is provided with a second surface 42, the first surface 41 and the second surface 42 cooperate to form the first group of sliding structures 4; the base 81 is provided with a third surface 51, the locking structure 8 is provided with a fourth surface 52, the third surface 51 and the fourth surface 52 cooperate to form the second group of sliding structures 5.

[0047] In this embodiment, when the locking structure 8 gradually seals and locks the internal component 1 from the proximal end to the distal end, the sealing and locking mechanism 3 has a first form, a second form, and a third form; in the first form, if Figures 2 to 3As shown, the base fitting 82 cooperates with the base 81 to drive the first surface 41 and the second surface 42 to approach each other axially and touch to form the first set of sliding fit structures 4. At this time, the sealing structure 6 and the locking structure 8 are both in a natural state; in the second form, as Figure 4 shown, the anti-radial extrusion performance of the distal end of the locking structure 8 is greater than or equal to the anti-radial extrusion performance of the sealing structure 6, so that the base fitting 82 cooperates with the base 81 to further drive the third surface 51 and the fourth surface 52 to approach each other axially, but the two do not touch. At this time, the second surface 42 is not radially extruded and does not form a locked state, and the sealing structure 6 is gradually compressed, deformed and gradually forms a sealed state; in the third form, as Figure 5 shown, the base 81 cooperates with the base fitting 82 to further drive the third surface 51 and the fourth surface 52 to approach each other axially and touch to form the second set of sliding fit structures 5. At the same time, the second surface 42 is radially compressed so that the first surface 41 and the second surface 42 approach each other further axially, and the limiting structure 7 restricts the axial displacement of the sealing structure 6. The sealing structure 6 is partially or completely compressed. At this time, the sealing and locking mechanism 3 initially seals and locks the built-in part 1; subsequently, after the base 81 and the base fitting 82 cooperate to further drive the first surface 41 and the second surface 42, and the third surface 51 and the fourth surface 52 to approach each other axially respectively, when the sealing structure 6 reaches the compression limit, the sealing and locking mechanism 3 finally realizes the dual functions of sealing and locking the built-in part 1 and the external part 2.

[0048] In this embodiment, as Figure 6 shown, the locking structure 8 is cylindrical or prismatic or wedge-shaped; at least one of the first surface 41 and the second surface 42 is an inclined surface, and the angle a between it and the proximal direction of the central axis of the sealing and locking device satisfies: 90° < a < 180°; at least one of the third surface 51 and the fourth surface 52 is an inclined surface, and the angle b between it and the proximal direction of the central axis of the sealing and locking device satisfies: 0° < b < 90°.

[0049] In this embodiment, as Figure 2 shown, the first surface 41 and the second surface 42 are both parallel inclined surfaces; the third surface 51 and the fourth surface 52 are both parallel inclined surfaces; on any cross-section passing through the central axis of the sealing and locking device, the angle c between the first set of sliding fit structures 4 and the second set of sliding fit structures 5 satisfies: 60° ≤ c ≤ 90°.

[0050] In this embodiment, the inner diameter d of the sealing structure 6 1 and the axial length L of the sealing structure 6 1, the stroke ΔL between the third surface 51 and the fourth surface 52 2 , the outer diameter D of the built-in member 1 5 satisfies the mathematical relationship: ΔL 2 × (D 1 2 - d 1 2 ) ≥ (L 1 - ΔL 2 ) × d 1 2 ; ΔL 2 × (D 1 2 - d 1 2 ) ≥ (L 1 - ΔL 2 ) × (d 1 2 - D 5 2 ).

[0051] In this embodiment, in the natural state, the axial length L of the sealing structure 6 1 , the outer diameter D of the sealing structure 6 1 satisfies the mathematical relationship: 0 < L 1 / D 1 ≤ 0.5; or, L 1 / D 1 ≥ 2.

[0052] In this embodiment, the overall height H of the third surface 51 3 , the overall height H of the fourth surface 52 2 , the diameter d of the locking structure 8 2 , the diameter D of the built-in member 1 5 satisfies the mathematical relationship: 2(H 3 + H 2 ) > d 2 - D 5 .

[0053] In this embodiment, the distance H from the upper end surface of the third surface 51 to the central axis of the sealing and locking device 2 , , the diameter d of the through hole of the base 81 3 , the diameter d of the locking structure 8 2 satisfies the mathematical relationship: d 3 < 2H 2 , - d 2 .

[0054] In this embodiment, an initial limiting structure is provided between the base 81 and the base fitting 82, and the initial limiting structure enables the base 81 and the base fitting 82 to always be in a state to be assembled in any state during the process of approaching or separating from each other.

[0055] In this embodiment, an exhaust structure 9 is provided in the distal region of the base 81 close to the sealing structure 6, and the exhaust structure 9 and the part of the base 81 connected to the exhaust structure 9 are transparent or semi-transparent.

[0056] In this embodiment, during pre-installation, the implanting device is located at the distal end of the inner member 1 and is restricted between the outer member 2 and the inner member 2.

[0057] In this embodiment, an external thread is provided in the proximal region of the base 81, and an internal thread matching the external thread is provided in the proximal region of the base fitting 82; after the distal end of the external thread and the distal end of the base fitting 82 are connected by a snap connection to form circumferential positioning, the locking structure 8 restricts the axial displacement of the inner member 1 through the cooperation of the external thread and the internal thread.

[0058] In this embodiment, the sealing structure 6 is made of an elastic material, and the elastic material has axial compressibility.

[0059] In this embodiment, as Figure 6 shown, the locking structure 8 sequentially includes a cone section 83 and a cylinder section 84 from the proximal end to the distal end, and the hole diameter of the cone section 83 gradually becomes smaller towards the end away from the cylinder section 84; a separation groove 85 is circumferentially and evenly provided in the proximal region of the locking structure 8, and the separation groove 85 divides the locking structure 8 into a plurality of clamping pieces 86, and the anti-radial extrusion performance of the distal end of the clamping piece 86 is greater than or equal to the anti-radial extrusion performance of the sealing structure 6; the ratio n of the length of the separation groove 85 to the length of the locking structure 8 satisfies: 0.5 ≤ n ≤ 1.

[0060] In this embodiment, as Figure 6 shown, the diameter d 2 of the locking structure 8, the diameter D 5 of the inner member 1, the number of the dividing grooves 85 is n, and the arc length w of each dividing groove 85 satisfy the mathematical relationship: 3(d 2 - D 5 ) > nw.

[0061] In this embodiment, a first limiting member is provided on the distal end surface of the sealing structure 6, and the first limiting member is fixedly or non-fixedly connected to the base 81; alternatively, a second limiting member is provided on the proximal end surface of the sealing structure 6, and the second limiting member is non-fixedly connected to the base 81, and the first limiting member and / or the second limiting member can axially move along with the sealing structure 6; the advantages involved are as follows: the first limiting member restricts the sealing structure 6 from entering the cavity of the base 81, and the second limiting member restricts the sealing structure 6 from entering the cavity of the locking structure 8.

[0062] The above content is only an exemplary embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, changes can be made in the specific implementation manner and application scope, and the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A sealing and locking device for an implant delivery system, characterized in that: it includes an inner member, an outer member, and a sealing and locking mechanism. The sealing and locking mechanism is sleeved outside the inner member through and connected to the proximal region of the outer member; two sets of sliding structures are arranged in the sealing and locking mechanism, and the sliding structures include a first set of sliding structures and a second set of sliding structures; wherein, the first set of sliding structures is located in the proximal region or outside the proximal region of the second set of sliding structures; after the first set of sliding structures is in a mating state, it then drives and triggers the second set of sliding structures to form a sliding fit, so that the dual functions of sealing and locking between the inner member and the outer member can be quickly realized through a single one-step operation at any time and at any relative position between the two; the sealing and locking mechanism includes a sealing structure, a limiting structure located in the distal region of the sealing structure, a locking structure located in the proximal region of the sealing structure, a base, and a base fitting connected to the base in cooperation; a first surface is provided on the base fitting, and a second surface is provided on the locking structure, and the first surface and the second surface cooperate to form the first set of sliding structures; a third surface is provided on the base, and a fourth surface is provided on the locking structure, and the third surface and the fourth surface cooperate to form the second set of sliding structures; when the inner member and the outer member gradually realize the dual functions of sealing and locking, the sealing and locking mechanism sequentially has a first form, a second form, and a third form; in the first form, the base fitting cooperates with the base and drives the first surface and the second surface to axially approach and touch each other to form the first set of sliding structures. At this time, both the sealing structure and the locking structure are in a natural state; in the second form, the anti-radial extrusion performance of the distal end of the locking structure is greater than or equal to the anti-radial extrusion performance of the sealing structure, so that the base fitting and the base cooperate to further drive the third surface and the fourth surface to axially approach each other but they do not touch. At this time, the second surface is not radially extruded and no locking state is formed, and the sealing structure is gradually compressed. The sealing structure deforms and gradually forms a sealing state; in the third form, the base fitting and the base cooperate to further drive the third surface and the fourth surface to axially approach and touch each other to form the second set of sliding structures. At the same time, the second surface is radially extruded, so that the first surface and the second surface further axially approach each other. The limiting structure limits the sealing structure in the base and restricts the axial displacement of the sealing structure. The sealing structure is partially or completely compressed. At this time, the sealing and locking mechanism preliminarily seals and locks the inner member; subsequently, after the base fitting and the base cooperate to further drive the first surface and the second surface, and the third surface and the fourth surface to continue to axially approach each other respectively, when the sealing structure reaches the compression limit, the sealing and locking mechanism finally realizes the dual functions of sealing and locking the inner member and the outer member; the sealing structure is made of an elastic material, and the elastic material has axial compressibility.

2. The sealing and locking device for an implant delivery system according to claim 1, characterized in that: the locking structure is cylindrical, prismatic or wedge-shaped; at least one of the first surface and the second surface is an inclined surface, and the angle a between it and the proximal direction of the central axis of the sealing and locking device satisfies: 90° < a < 180°; at least one of the third surface and the fourth surface is an inclined surface, and the angle b between it and the proximal direction of the central axis of the sealing and locking device satisfies: 0° < b < 90°.

3. The sealing and locking device for an implant delivery system according to claim 1, characterized in that: both the first surface and the second surface are parallel inclined surfaces; both the third surface and the fourth surface are parallel inclined surfaces; on any cross-section passing through the central axis of the sealing and locking device, the angle c between the first set of sliding and mating structures and the second set of sliding and mating structures satisfies: 60° ≤ c ≤ 90°.

4. The sealing and locking device for an implant delivery system according to claim 1, characterized in that: The inner diameter d1 of the sealing structure, the axial length L1 of the sealing structure, the stroke △L2 between the third surface and the fourth surface, and the outer diameter D5 of the built-in member satisfy the mathematical relationship: △L2×(D1 2 -d1 2 ) ≥ (L1 - △L2)×d1 2 ; △L2×(D1 2 -d1 2 ) ≥ (L1 - △L2)×(d1 2 -D5 2 ).

5. The sealing and locking device for an implant delivery system according to claim 1, characterized in that: In the natural state, the axial length L1 of the sealing structure and the outer diameter D1 of the sealing structure satisfy the mathematical relationship: 0 < L1 / D1 ≤ 0.5; or, L1 / D1 ≥ 2.

6. The sealing and locking device for an implant delivery system according to claim 4, characterized in that: the overall height H3 of the third surface, the overall height H2 of the fourth surface, the diameter d2 of the locking structure, and the outer diameter D5 of the built-in member satisfy the mathematical relationship: 2(H3 + H2) > d2 - D5.

7. The sealing and locking device for an implant delivery system according to claim 6, characterized in that: the distance H2' from the upper end surface of the third surface to the central axis of the sealing and locking device, the diameter d3 of the base through hole, and the diameter d2 of the locking structure satisfy the mathematical relationship: d3 < 2H2' - d2.

8. The sealing and locking device for an implant delivery system according to claim 1, characterized in that: an initial limiting structure is provided between the base and the base mating part, and the initial limiting structure enables the base and the base mating part to always be in a state to be assembled in any state during the process of approaching or separating from each other.

9. The sealing and locking device for an implant delivery system according to claim 1, characterized in that: a first limiting member is provided on the distal end surface of the sealing structure, and the first limiting member is fixedly or non-fixedly connected to the base; or, a second limiting member is provided on the proximal end surface of the sealing structure, and the second limiting member is non-fixedly connected to the base, and the first limiting member and / or the second limiting member can move axially along with the sealing structure.

10. The sealing and locking device for an implant delivery system according to claim 1, characterized in that: an exhaust structure is provided in the distal region of the base close to the sealing structure, and the exhaust structure and the part of the base connected to the exhaust structure are transparent or semi-transparent.

11. A sealing and locking device for an implant delivery system according to claim 1, characterized in that: the proximal region of the base is provided with an external thread, and the proximal region of the base fitting is provided with an internal thread that mates with the external thread; after the distal end of the external thread and the distal end of the base fitting are connected by a snap connection to form circumferential positioning, the locking structure restricts the axial displacement of the built-in member through the cooperation of the external thread and the internal thread.

12. A sealing and locking device for an implant delivery system according to claim 6, characterized in that: the locking structure sequentially includes a cone section and a cylinder section from the proximal end to the distal end, and the hole diameter of the cone section gradually decreases towards the end away from the cylinder section; the proximal region of the locking structure is circumferentially and evenly provided with partition grooves, and the partition grooves divide the locking structure into multiple clamping pieces, and the anti-radial extrusion performance of the distal end of the clamping piece is greater than or equal to the anti-radial extrusion performance of the sealing structure; the ratio n of the length of the clamping piece to the length of the locking structure satisfies: 0.5 ≤ n ≤ 1.

13. A sealing and locking device for an implant delivery system according to claim 12, characterized in that: the diameter d2 of the locking structure, the outer diameter D5 of the built-in member, the number of the partition grooves is n, and the arc length w of each partition groove satisfy the mathematical relationship: 3(d2 - D5) > nw.

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