Sealing valve body and guiding sheath

Abstract

The invention relates to the technical field of medical instruments, and provides a sealing valve body and a guiding sheath, the sealing valve body comprises a base body and a first valve core arranged in the base body; the base body is provided with a first containing space, and the first valve element is located in the first containing space. The first valve element comprises two fixed ends fixed to the base body and a connecting section located between the two fixed ends, and the first valve element is provided with a first channel penetrating through the two fixed ends and the connecting section. The sealing valve body comprises an inner film piece, the two ends of the inner film piece extend out of the two fixed end portions of the first valve element respectively, and folds are formed on the portion, located in the first valve element, of the inner film piece. According to the technical scheme, the sealing performance between the instrument penetrating through the first valve element and the first valve element is adjusted in a self-adaptive mode, and therefore the sealing effect of the sealing valve body is improved.

Description

Technical Field

[0001] The present application relates to the technical field of interventional medical devices, and in particular to a sealing valve body and a guide sheath of an interventional guide sheath. Background Art

[0002] Introducer sheaths are commonly used in invasive medical devices. They typically puncture blood vessels to establish an access channel. A sealing valve is used at the proximal end of the introducer sheath to prevent blood loss.

[0003] Existing hemostatic sealing methods typically involve creating a slotted or cross-shaped hole in a silicone hemostatic valve to allow the delivery system to pass through. The valve then compresses the delivery system through its own elastic contraction, creating a seal. However, during the moment of instrument insertion or withdrawal, the pressure on the valve prevents it from recovering quickly, compromising its sealing effectiveness. Summary of the Invention

[0004] The technical problem to be solved by the present application is to provide a sealing valve body with improved sealing performance and a guide sheath using the sealing valve body.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions: In the first aspect, the present application provides a sealing valve body, comprising a base, a first valve core arranged in the base, an extrusion mechanism for extruding the first valve core, and an adjusting member assembled on the base and capable of moving relative to the base to apply force to the extrusion mechanism; the base has a first accommodating space, and the first valve core is located in the first accommodating space; the first valve core is provided with a first passage running through it; the extrusion mechanism includes an elastic member pre-compressed in the radial direction of the first valve core.

[0006] In the process of implementing the above technical solution, the sealing valve body includes a base and a first valve core arranged in the base; it also includes an extrusion mechanism arranged in the base and capable of squeezing the first valve core, and an adjusting member assembled on the base and capable of moving relative to the base and applying force to the extrusion mechanism; the base has a first accommodating space, the first valve core is located in the first accommodating space, the first valve core is provided with a first through-channel, and the first channel can allow instruments of different radial sizes to pass through; the extrusion mechanism includes an elastic member pre-compressed in the radial direction of the first valve core, and due to the pre-compression of the elastic member, the elastic force of the elastic member of the extrusion mechanism is not exerted before the first valve core is passed through the instrument. The extrusion mechanism can always be pressed against the outer surface of the first valve core, providing radial pre-pressure to the first valve core. In this way, when instruments of different radial sizes pass through the first channel, force is applied to the extrusion mechanism by adjusting the movement distance of the adjusting member to adapt to it, thereby adjusting the tightness between instruments of different radial sizes and the first valve core, improving the sealing effect, and also improving the adaptability of the sealing valve body to interventional instruments of different radial sizes; when the instrument is introduced or withdrawn, due to the effect of the pre-pressure, the first valve core can also play a sealing effect when it cannot recover its deformation in time, thereby improving the sealing of the sealing valve body.

[0007] As an embodiment, the first valve core includes two fixed ends fixed to the base and a connecting section located between the two fixed ends, the radial dimension of the connecting section is smaller than the radial dimension of the two fixed ends, and the elastic member is located in the radial direction of the connecting section.

[0008] In the process of implementing the above technical solution, the first valve core includes two fixed ends relatively fixed to the base, which can improve the stability between the first valve core and the base, reduce the shaking of the base, and improve the success rate of the operation; the first valve core also includes a connecting section located between the two fixed ends, and the radial dimension of the connecting section is smaller than the radial dimension of the two fixed ends, that is, the radial dimension of the fixed end is gradually increased in the direction away from the connecting section. In this way, when the elastic part is in the radial direction of the connecting section, it does not occupy additional space, improves space utilization, and can provide accommodation space and deformation space for the extrusion mechanism. At the same time, when the adjusting part moves toward the distal end, the adjusting part can more easily extrude the connecting section through the extrusion mechanism, and then it is easier to adjust the sealing effect between the connecting section and the instrument.

[0009] As an embodiment, the extrusion mechanism includes at least two elastic members, and the two elastic members are respectively located on opposite sides of the connecting section in the radial direction.

[0010] In the process of implementing the above technical solution, the extrusion mechanism includes at least two elastic parts, and the two elastic parts are respectively located on opposite sides of the connecting section in the radial direction, so that the extrusion force generated is from two opposite directions of the connecting section, so that when the first valve core cannot recover its deformation in time, it can improve the sealing effect between the device and the connecting section.

[0011] As an embodiment, the extrusion mechanism includes a first extrusion component and a second extrusion component, the first extrusion component and the second extrusion component are respectively located on opposite sides of the connecting section, the first extrusion component includes a first abutment member for abutting against the connecting section, and the second extrusion component includes a second abutment member for abutting against the connecting section; one end of the two elastic members abuts against the first abutment member and the second abutment member, respectively.

[0012] In the process of implementing the above technical solution, the extrusion mechanism includes a first extrusion component and a second extrusion component, and the first extrusion component and the second extrusion component are respectively located on opposite sides of the connecting section. The extrusion force generated by the first extrusion component and the second extrusion component is from two opposite directions of the connecting section, thereby improving the sealing effect between the instrument and the connecting section; the first extrusion component includes a first abutment for abutting the connecting section, and the second extrusion component includes a second abutment for abutting the connecting section; one end of the two elastic members abuts the first abutment and the second abutment respectively, and the first abutment and the second abutment can provide stable support for the elastic member, and the first abutment and the second abutment are respectively in direct contact with the connecting section to increase the contact area and avoid direct contact between the two elastic members and the connecting section, thereby improving the sealing performance.

[0013] As an embodiment, the first extrusion assembly further includes a first support member, and the second extrusion assembly further includes a second support member, wherein the two ends of one of the elastic members respectively abut against the first support member and the first abutment member; and the two ends of the other elastic member respectively abut against the second support member and the second abutment member.

[0014] In the process of implementing the above technical solution, the first extrusion component also includes a first support member, and the second extrusion component also includes a second support member. The first support member cooperates with the first abutment member, and the two ends of one elastic member respectively abut against the first support member and the first abutment member, providing a stable supporting force to one of the elastic members, so that the first abutment member always abuts against the outer surface of the connecting section, and provides pre-pressure to one radial direction of the connecting section; the second support member cooperates with the second abutment member, and the two ends of the other elastic member respectively abut against the second support member and the second abutment member, providing a stable supporting force to the other elastic member, so that the second abutment member always abuts against the outer surface of the connecting section, and provides pre-pressure to another radial direction of the connecting section.

[0015] As an embodiment, the first abutting member and the second abutting member are respectively provided with corresponding extrusion grooves, and the connecting section is located in the extrusion grooves.

[0016] In the process of implementing the above technical solution, the first abutment member and the second abutment member are respectively provided with corresponding extrusion grooves, the extrusion grooves are adapted to the connecting section, and the connecting section is located in the extrusion grooves. In this way, the contact area between the first abutment member and the second abutment member and the connecting section can be increased, and the sealing effect between the first extrusion assembly and the second extrusion assembly and the connecting section can be further improved.

[0017] As an embodiment, the first abutment member includes at least two first protruding teeth protruding toward the connecting section, and a recess is formed between two adjacent first protruding teeth; the second abutment member includes at least one second protruding tooth for pressing toward the recess, and the first protruding tooth and the second protruding tooth are respectively arranged in the extrusion groove.

[0018] In the process of implementing the above technical solution, the first abutment member includes at least two first protruding teeth protruding toward the connecting section, and a recess is formed between two adjacent first protruding teeth; the second abutment member includes at least one second protruding tooth for pressing toward the recess, and the first protruding tooth and the second protruding tooth are respectively arranged in the extrusion groove. In this way, when the first abutment member and the second abutment member both form a pressing force on the connecting section, the staggered first protruding teeth and the second protruding teeth can generate a bite force on the connecting section to improve the sealing between the connecting section and the instrument.

[0019] As an embodiment, the first support member and the second support member are slidably connected.

[0020] In the process of implementing the above technical solution, the first support member and the second support member can be slidably connected to each other, so as to improve the stability of the first support member and the second support member when they slide relative to each other.

[0021] As an embodiment, the first support member is arranged to pass through on both sides perpendicular to the axial direction of the first valve core, and the first abutment member includes a convex portion that is clamped in the through-passing area, and the convex portion can slide along the through-passing area; the second support member is provided with a chamber for accommodating the second abutment member, and the second abutment member can slide in the chamber.

[0022] In the process of implementing the above technical scheme, the first support member is arranged to pass through on both sides perpendicular to the axial direction of the first valve core, that is, the first support member is arranged to pass through on both sides along the radial direction of the first valve core, and the first abutment member includes a convex portion that is clamped in the through-passing area. When the adjusting member applies force to the first support member, the elastic member is deformed. Since the convex portion is clamped in the through-passing area, it guides the first support member and also prevents the first abutment member from detaching from the through-passing area, so that the first support member can move along the radial direction of the connecting section to compress the elastic member, thereby improving the stability between the first support member and the first abutment member; the second support member is provided with a chamber for accommodating the second abutment member, and the second abutment member can slide in the chamber. When the adjusting member applies force to the second support member, the elastic member is deformed. The second abutment member is arranged in the chamber, which guides the second support member, so that the second support member can move along the radial direction of the connecting section to compress the elastic member, thereby improving the stability between the second support member and the second abutment member.

[0023] As an embodiment, the adjusting member includes a force-applying portion that can apply force to the extrusion mechanism. When the adjusting member moves relative to the base, the force-applying portion squeezes the first support member and the second support member, causing the first abutment member and the second abutment member to squeeze the connecting section respectively.

[0024] In the process of implementing the above technical solution, the adjusting member includes a force-applying portion that can apply force to the extrusion mechanism. When the adjusting member moves relative to the base, the force-applying portion on the adjusting member can squeeze the first support member and the second support member, and the first support member and the second support member squeeze the two elastic members respectively. The two elastic members transmit the elastic force to the first abutment member and the second abutment member respectively, so that the first abutment member and the second abutment member squeeze the connecting section respectively. When instruments with different radial sizes pass through the connecting section, the tightness between the instruments with different radial sizes and the connecting section can be adjusted by adjusting the movement distance of the adjusting member to adapt to it, thereby improving the sealing effect and the adaptability of the sealing valve body to interventional instruments with different radial sizes. As an embodiment, the first support member and the second support member are respectively provided with a clamping portion on one side facing the base body for positioning with the base body.

[0025] In the process of implementing the above technical solution, the first support member and the second support member are respectively provided with a clamping portion for positioning with the base on the side facing the base. By providing the clamping portion, the stability between the first support member and the second support member and the base is improved.

[0026] As an embodiment, the base includes a distal positioning portion and a proximal positioning portion, and the two fixed ends of the first valve core are respectively fixed to the distal positioning portion and the proximal positioning portion; the distal positioning portion is provided with a wing extending toward the proximal direction, and the wing is provided with an external thread; the adjusting member is provided with an internal thread matching the external thread, and the adjusting member is rotated relative to the wing so as to be movable in the axial direction.

[0027] In the process of implementing the above technical solution, the base includes a distal positioning part and a proximal positioning part, and the two fixed ends of the first valve core are respectively fixed to the distal positioning part and the proximal positioning part, thereby improving the stability between the base and the first valve core; the distal positioning part is provided with a wing extending toward the proximal direction, and the wing is provided with an external thread; the adjusting member is provided with an internal thread matching the external thread, and the adjusting member is matched with the wing thread, and can be rotated relative to the wing so as to move in the axial direction, and also realizes that the adjusting member can adaptably adjust the extrusion strength between the extrusion mechanism and the connecting section.

[0028] As an embodiment, the number of the fins is at least two and they are evenly distributed in the circumferential direction, and adjacent fins are spaced apart. The force applying portion presses the first support member and the second support member by pressing the fins.

[0029] In the process of implementing the above technical solution, the number of wings is at least two, and they are evenly distributed in the circumferential direction. A wing gap is formed between adjacent wings. The first support member and the second support member are respectively fitted with the wings. When the adjusting member moves toward the distal spiral, the force-applying part can fit with the wing and squeeze the wing. By applying a resistance force to the wing, the force is transmitted from the wing to the first support member and the second support member, thereby realizing adaptive adjustment of the adjusting member.

[0030] As an embodiment, the distal positioning portion includes a fixed head and a support seat, the inner circumference of the fixed head is provided with a first positioning portion for connecting with the first valve core, the fixed end at the distal end is provided with a first positioning matching portion, the support seat is provided with the wing, the support seat is sleeved on the outer circumference of the fixed head, and is detachably connected to the fixed head; the proximal positioning portion is provided with a second positioning portion, the proximal fixed end is provided with a second positioning matching portion, and the second positioning portion and the second positioning matching portion are matched and connected with each other.

[0031] In the process of implementing the above technical solution, the distal positioning part includes a fixed head and a support seat. The inner peripheral side of the fixed head is provided with a first positioning part for connecting with the first valve core. When the distal end of the first valve core is connected to the distal positioning part, the structural stability between the two can be improved; the support seat is provided with a wing, the support seat is sleeved on the outer periphery of the fixed head, and is detachably connected to the fixed head, so as to facilitate the assembly of the fixed head and the support seat; the proximal positioning part is provided with a second positioning part, and the fixed end part of the proximal end of the first valve core is provided with a second positioning matching part. The second positioning part and the second positioning matching part are matched and connected with each other, thereby realizing the fixed connection between the proximal end of the first valve core and the proximal positioning part, so as to improve the structural stability of the first valve core and the proximal positioning part.

[0032] As an embodiment, the distal positioning portion is provided with a first positioning portion, the fixed end portion at the distal end is provided with a first positioning matching portion, and the first positioning portion and the first positioning matching portion are mutually matched and connected; the proximal positioning portion is provided with a second positioning portion, the fixed end portion at the proximal end is provided with a second positioning matching portion, and the second positioning portion and the second positioning matching portion are mutually matched and connected.

[0033] In the process of implementing the above technical solution, the distal positioning portion is provided with a first positioning portion, and the fixed end portion of the distal end of the first valve core is provided with a first positioning matching portion, and the first positioning portion and the first positioning matching portion are mutually matched and connected, which can improve the structural stability between the two; the proximal positioning portion is provided with a second positioning portion, and the fixed end portion of the proximal end of the first valve core is provided with a second positioning matching portion, and the second positioning portion and the second positioning matching portion are mutually matched and connected, so as to improve the structural stability of the first valve core and the proximal positioning portion.

[0034] As an embodiment, the sealing valve body also includes a connecting seat for accommodating a second valve core, the proximal end of the connecting seat is connected to the distal positioning portion, the distal end of the distal positioning portion abuts against the proximal end of the second valve core, and the inner circumference of the distal positioning portion is provided with an annular boss for abutting against the second valve core.

[0035] In the process of implementing the above technical solution, the sealing valve body also includes a connecting seat for accommodating the second valve core, the proximal end of the connecting seat is connected to the distal positioning part, the distal end of the distal positioning part abuts the proximal end of the second valve core, and an annular boss for abutting the second valve core is provided on the inner circumference of the distal positioning part. When the connecting seat is threadedly connected to the distal positioning part, the second valve core is positioned by setting the annular boss to improve the sealing effect.

[0036] As an embodiment, the sealing valve body further includes an inner membrane member, both ends of which extend out of two fixed ends of the first valve core respectively, and a portion of the inner membrane member located inside the first valve core is formed with folds.

[0037] In the process of implementing the above technical solution, the sealing valve body also includes an inner membrane part. By setting the inner membrane part and utilizing the lubricating characteristics of the inner membrane part itself, it is easier for the instrument to pass through and reduces the friction between the instrument and the first valve core; and the part of the inner membrane part located inside the first valve core is formed with folds, so that when the instrument passes through, the folds of the inner membrane part can fill the gap between the instrument and the inner membrane part, thereby increasing the sealing effect between the instrument and the first valve core; the two ends of the inner membrane part respectively extend out of the two fixed end parts of the first valve core, so that the two ends of the inner membrane part are convenient for the first clamping part and the second clamping part to be respectively inserted into the part of the first valve core to achieve fixation.

[0038] As an embodiment, a first clamping member is provided in the base body, the first clamping member is located at the proximal end of the second valve core, and is communicated with the second valve core, one end of the first clamping member is respectively abutted against the annular boss and the second valve core, and the other end is tightly connected with the distal end of the inner membrane member and abuts against one end of the first valve core; a second clamping member is also provided at the proximal end of the base body, the second clamping member penetrates the proximal positioning portion, and is tightly connected with the proximal end of the inner membrane member and abuts against the other end of the first valve core.

[0039] In the process of implementing the above technical scheme, a first clamping piece is provided in the base body, the first clamping piece is located at the proximal end of the second valve core and is connected with the second valve core to facilitate the passage of the instrument; one end of the first clamping piece is respectively abutted against the annular boss and the second valve core, and the other end is tightly fitted with the distal end of the inner membrane piece, that is, one end of the inner membrane piece is sleeved on one end of the first clamping piece, and the first clamping piece is sleeved with one end of the inner membrane piece and inserted into the first valve core, and abutted against one end of the first valve core, so as to fix the inner membrane piece; the proximal end of the base body is also provided with a second clamping piece, the second clamping piece penetrates the proximal positioning portion and is tightly fitted with the proximal end of the inner membrane piece, that is, the other end of the inner membrane piece is sleeved on one end of the second clamping piece, and the second clamping piece is sleeved with the other end of the inner membrane piece and inserted into the first valve core, and abutted against the other end of the first valve core, so as to fix the inner membrane piece, and the first clamping piece and the second clamping piece are provided to fix the two ends of the inner membrane piece to prevent the inner membrane piece from moving when the instrument is penetrated.

[0040] In a second aspect, the present application provides a guide sheath comprising the sealing valve body provided in the first aspect and a sheath tube connected to the distal end of the sealing valve body.

[0041] In the process of implementing the above technical solution, by setting up a sheath, it is possible to guide the intervention of the instrument, and at the same time, it can also play a role in protecting the blood vessels and reducing the risk of the instrument scratching the blood vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic diagram of the overall structure of the sealing valve body provided in an embodiment of the present application; Figure 2 for Figure 1 AA-direction cross-sectional structural diagram; Figure 3 A schematic diagram of a partially exploded structure of a sealing valve body provided in an embodiment of the present application; Figure 4 A schematic diagram of a partially exploded structure of a sealing valve body provided in an embodiment of the present application from another perspective; Figure 5 Schematic diagram of the partially exploded structure of the sealing valve body provided by the embodiment of the present application from different perspectives; Figure 6 A schematic diagram of a partially exploded structure of the sealing valve body provided in an embodiment of the present application from another perspective.

[0044] Icons: 1-base; 11-distal positioning portion; 111-first positioning portion; 1111-first groove; 1112-annular protrusion; 112-wing; 113-fixed head; 1131-annular boss; 114-support seat; 12-proximal positioning portion; 121-second positioning portion; 13-adjusting member; 131-force-applying portion; 2-second valve core; 3-first valve core; 31-fixed end; 311-first positioning matching portion; 3111-first protrusion; 3112-annular groove; 32-connecting Connecting section; 331-second positioning and fitting portion; 4-connecting seat; 41-exhaust channel; 5-sheath tube pressure cover; 6-sheath tube; 7-extrusion mechanism; 71-first extrusion assembly; 711-first support member; 712-first abutment member; 7121-first convex tooth; 7122-convex portion; 713-elastic member; 72-second extrusion assembly; 721-second support member; 7211-slideway; 723-second abutment member; 73-clamping portion; 8-inner membrane member; 9-first clamping member; 10-second clamping member. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0046] It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. Furthermore, in the description of this application, the term "distal end" refers to the end of the components of the delivery device that is closest to the cardiac tissue, and "proximal end" refers to the end of the delivery device that is closest to the operator. The terms "first," "second," etc. are used solely to distinguish between the descriptions and should not be understood to indicate or imply relative importance.

[0047] On the first aspect, the embodiment of the present application provides a sealing valve body, which can provide pre-pressure to the first valve core 3 in the sealing valve body before the instrument is inserted. When the instrument is inserted or withdrawn, due to the effect of the pre-pressure, it can also achieve a sealing effect even if the deformation cannot be restored in time; and when the instrument passes through, it can be tightened in time, and covered on the peripheral wall of the instrument for timely sealing to prevent blood from seeping; and the sealing valve body can adaptively adjust the tightening force according to the diameter of the instrument passed through to perform effective sealing.

[0048] like Figures 1 to 3 As shown, the sealing valve body includes a base 1 and a first valve core 3 arranged in the base 1; it also includes an extrusion mechanism 7 assembled on the base 1 and capable of squeezing the first valve core 3, and an adjusting member 13 assembled on the base 1 and capable of moving relative to the base 1; the base 1 has a first accommodating space, the first valve core 3 is located in the first accommodating space, the first valve core 3 is provided with a first through-channel, and the first channel can allow instruments of different radial sizes to pass through; the extrusion mechanism 7 includes an elastic member 713 pre-compressed in the radial direction of the first valve core 3, and due to the pre-compression of the elastic member 713, the elasticity of the elastic member 713 is reduced before the first valve core 3 is passed through the extrusion mechanism 7. The force can make the extrusion mechanism 7 always press against the outer surface of the first valve core 3, providing radial pre-pressure to the first valve core 3. In this way, when instruments of different radial sizes pass through the first channel, the extrusion mechanism 7 is exerted with force by adjusting the movement distance of the adjusting member 13 to adapt to it, so as to adjust the tightness between instruments of different radial sizes and the first valve core 3, improve the sealing effect, and also improve the adaptability of the sealing valve body to interventional instruments of different radial sizes; when the instrument is introduced or withdrawn, due to the effect of the pre-pressure, the first valve core 3 can also play a sealing effect when it cannot recover its deformation in time, thereby improving the sealing of the sealing valve body. Optionally, the elastic member 713 may be a spring, an elastic washer, or a spring.

[0049] Optionally, the device can be a catheter for delivering implants or repairing intracavitary tissue, a guidewire, or a delivery sheath for valves and peripheral vascular interventional therapy products.

[0050] Optionally, the sealing valve body in the embodiment of the present application can be used in fields involving interventional surgery such as heart valve replacement, repair, peripheral intervention, and gastrointestinal intervention, thereby improving the applicability of the product.

[0051] like Figure 4 As shown, as an embodiment, the first valve core 3 includes two fixed ends 31 fixed relatively to the base 1, which can improve the stability between the first valve core 3 and the base 1, reduce the shaking of the base 1, and improve the success rate of the operation; the first valve core 3 also includes a connecting section 32 located between the two fixed ends 31, and the radial dimension of the connecting section 32 is smaller than the radial dimension of the two fixed ends 31, that is, the radial dimension of the fixed end 31 is gradually increased in the direction away from the connecting section 32. In this way, when the extrusion mechanism 7 abuts against the position of the connecting section 32, no additional space is occupied, the space utilization rate is improved, and the extrusion mechanism 7 can provide an accommodating space and a deformation space. At the same time, when the adjusting member 13 moves toward the distal end, the force-applying portion 131 is more likely to extrude the connecting section 32 through the extrusion mechanism 7, thereby making it easier to adjust the sealing effect between the connecting section 32 and the instrument.

[0052] Optionally, the two fixed ends 31 and the connecting section 32 are integrally formed, and the first valve core 3 may be a silicone member or a rubber member.

[0053] Optionally, in some cases, the first valve core 3 may also have only a fixed end portion 31 at the distal end and a connecting section 32 .

[0054] like Figure 2 and 4 As shown, as an embodiment, the extrusion mechanism 7 includes at least two elastic members 713, and the two elastic members 713 are respectively located on opposite sides of the connecting section 32 in the radial direction, so that the extrusion force generated is from two opposite directions of the connecting section 32, so that when the first valve core 3 cannot recover the deformation in time, it can improve the sealing effect between the device and the connecting section 32.

[0055] Of course, in some cases, the two elastic members 713 may also generate a squeezing force on the connecting section 32 from two non-opposite sides in other directions.

[0056] like Figures 2 to 4As shown, as an embodiment, the extrusion mechanism 7 includes a first extrusion component 71 and a second extrusion component 72, and the first extrusion component 71 and the second extrusion component 72 are respectively located on opposite sides of the connecting section 32. The extrusion force generated by the first extrusion component 71 and the second extrusion component 72 is from two opposite directions of the connecting section 32, thereby improving the sealing effect between the instrument and the connecting section 32; the first extrusion component 71 includes a first abutment 712 for abutting against the connecting section 32, and the second extrusion component 72 includes a second abutment 723 for abutting against the connecting section 32; one end of the two elastic members 713 abuts against the first abutment 712 and the second abutment 723 respectively, and the first abutment 712 and the second abutment 723 can provide stable support for the elastic member 713, and the first abutment 712 and the second abutment 723 are respectively in direct contact with the connecting section 32, thereby increasing the contact area and avoiding direct contact between the two elastic members 713 and the connecting section 32, thereby improving the sealing performance.

[0057] Optionally, since both the first abutting member 712 and the second abutting member 723 are solid parts, the contact area can be increased compared to the contact between the elastic member 713 and the connecting section 32 .

[0058] Optionally, the first abutment member 712 and the second abutment member 723 both include arc-shaped protrusions, the curvature of the protrusions matches the curvature of the connecting section, so that the first abutment member 712 and the second abutment member 723 can play the role of encircling the connecting section 32, thereby improving the sealing effect.

[0059] like Figure 2 、 4 As shown in Figure 6, as an embodiment, the first extrusion assembly 71 also includes a first support member 711, and the second extrusion assembly 72 also includes a second support member 721. The first support member 711 and the first abutment member 712 cooperate with each other, and the two ends of one elastic member 713 respectively abut against the first support member 711 and the first abutment member 712, providing a stable supporting force thereto, so that the first abutment member 712 always abuts against the outer surface of the connecting section 32, providing a pre-pressure in one radial direction of the connecting section 32; the second support member 721 and the second abutment member 723 cooperate with each other, and the two ends of the other elastic member 713 respectively abut against the second support member 721 and the second abutment member 723, providing a stable supporting force for the other elastic member 713, so that the second abutment member 723 always abuts against the outer surface of the connecting section 32, providing a pre-pressure in another radial direction of the connecting section 32.

[0060] Optionally, both the first abutment 712 and the second abutment 723 can be provided with positioning columns to position one end of the elastic member 713, which can of course also be positioning grooves; similarly, the first support member 711 and the second support member 721 can also be provided with positioning columns to position the other end of the elastic member 713.

[0061] As an embodiment, the first abutment 712 and the second abutment 723 are respectively provided with corresponding extrusion grooves, which are adapted to the connecting section 32, and the connecting section 32 is located in the extrusion grooves. In this way, the contact area between the first abutment 712 and the second abutment 723 and the connecting section 32 can be increased, and the sealing effect between the extrusion mechanism 7 and the connecting section 32 can be further improved.

[0062] Optionally, the two extrusion grooves can form a ring shape, so that the connecting section 32 is located in the extrusion groove.

[0063] like Figure 2 and 4 As shown, as an embodiment, the first abutment member 712 includes at least two first protruding teeth 7121 protruding toward the connecting section 32, and a recess is formed between two adjacent first protruding teeth 7121; the second abutment member 723 includes at least one second protruding tooth for pressing toward the recess, so that when the first abutment member 712 and the second abutment member 723 both form a pressing force on the connecting section 32, the staggered first protruding teeth 7121 and the second protruding teeth can generate a bite force on the connecting section 32 to improve the sealing between the connecting section 32 and the instrument.

[0064] As an embodiment, the first support member 711 and the second support member 721 can be slidably connected to each other to improve the stability of the first support member 711 and the second support member 721 when they slide relative to each other.

[0065] like Figure 3 As shown, optionally, a slide 7211 is provided on the second support member 721 along the radial direction of the connecting section 32, and a protrusion that can slide in the slide 7211 is provided on the first support member 711. By setting the protrusion on the first support member 711, the relative sliding of the first support member 711 and the second support member 721 is achieved. At the same time, the slide 7211 limits the sliding distance of the first support member 711, thereby preventing the first support member 711 from detaching from the slide 7211.

[0066] Optionally, in some cases, the first support member 711 and the second support member 721 may also be slidably connected by plugging, that is, a plug-in groove may be provided on the second support member 721, and the first support member 711 may include a plug-in column.

[0067] Optionally, the slide 7211 limits the sliding distance of the first support member 711 to prevent the first support member 711 from touching the second abutment 723; at the same time, the first support member 711 and the second support member 721 are mutually limited by the slide 7211 and the protrusion, so that the first support member 711 and the second support member 721 respectively generate compression on the elastic member 713 in the initial state, and the compression of the elastic member 713 will generate elastic force on the first abutment 712 and the second abutment 723 respectively, so that the first abutment 712 and the second abutment 723 generate pre-pressure on the first valve core 3 before the instrument is passed into the first valve core 3, that is, the first valve core 3 is also in a sealed state before the instrument is passed into.

[0068] like Figure 6 As shown, as an embodiment, the first support member 711 is provided on both sides perpendicular to the axial direction of the first valve core 3, that is, the first support member 711 is provided on both sides along the radial direction of the first valve core 3, and the first abutment member 712 includes a convex portion 7122 that is engaged with the through-passing area. When the adjusting member 13 applies force to the first support member 711, the elastic member 713 is deformed. Since the convex portion 7122 is engaged with the through-passing area, it guides the first support member 711 and also prevents the first abutment member 712 from detaching from the through-passing area, so that the first support member 711 can be moved along the radial direction of the connecting section 32. The compression elastic member 713 is moved in the radial direction to improve the stability between the first support member 711 and the first abutment member 712; the second support member 721 is provided with a chamber for accommodating the second abutment member 723, and the second abutment member 723 can slide in the chamber. When the adjusting member 13 applies force to the second support member 721, the elastic member 713 is deformed, and the second abutment member 723 is arranged in the chamber to guide the second support member 721, so that the second support member 721 can move the compression elastic member 713 along the radial direction of the connecting section 32, thereby improving the stability between the second support member 721 and the second abutment member 723.

[0069] Optionally, the volume of the cavity of the second support member 721 is larger than a part of the first support member 711 . This is because the end of the first support member 711 facing the second support member 721 is inserted into the cavity and forms a sliding connection with the second support member 721 .

[0070] like Figure 2 and 5As shown, as an embodiment, the adjusting member 13 includes a force-applying portion 131 capable of applying force to the extrusion mechanism 7. When the adjusting member 13 moves relative to the base 1, the force-applying portion 131 on the adjusting member 13 can squeeze the first support member 711 and the second support member 721. The first support member 711 and the second support member 721 respectively squeeze the two elastic members 713, and the two elastic members 713 respectively transmit the elastic force to the first abutment member 712 and the second abutment member 723, so that the first abutment member 712 and the second abutment member 723 respectively squeeze the connecting section 32. When instruments with different radial sizes pass through the connecting section 32, the tightness between the instruments with different radial sizes and the connecting section 32 can be adjusted by adjusting the movement distance of the adjusting member 13 to adapt to it, thereby improving the sealing effect and the adaptability of the sealing valve body to interventional instruments with different radial sizes. Optionally, the force-applying portion 131 is protruding along the inner circumferential wall of the adjusting member 13 , that is, the inner diameter of the adjusting member 13 is tapered.

[0071] like Figure 5 As shown, as an embodiment, the first support member 711 and the second support member 721 are respectively provided with a clamping portion 73 for positioning with the base 1 on the side facing the base 1. By providing the clamping portion 73, the stability between the first support member 711 and the second support member 721 and the base 1 is improved.

[0072] Optionally, the base 1 includes a distal positioning portion 11, and the distal positioning portion 11 is provided with a snap-fitting portion for snapping with the snap-fitting portion 73. The snap-fitting portion 73 may be a groove, and the snap-fitting portion may be a convex portion.

[0073] like Figures 4 to 6 As shown, as an embodiment, the base 1 includes a distal positioning portion 11 and a proximal positioning portion 12, and the two fixed end portions 31 of the first valve core 3 are respectively fixed to the distal positioning portion 11 and the proximal positioning portion 12, thereby improving the stability between the base 1 and the first valve core 3; the distal positioning portion 11 is provided with a wing 112 extending in the proximal direction, and the wing 112 is provided with an external thread; the adjusting member 13 is provided with an internal thread matching the external thread, and the adjusting member 13 is threadedly matched with the wing 112, and can be rotated relative to the wing 112 so as to move in the axial direction, which also enables the adjusting member 13 to adaptably adjust the extrusion strength between the extrusion mechanism 7 and the connecting section 32.

[0074] Optionally, the distal positioning portion 11, the proximal positioning portion 12 and the first valve core 3 may be integrally injection-molded, thereby improving the stability between the three parts and reducing the number of assembly and installation steps.

[0075] like Figure 2As shown, as an embodiment, the number of the winglets 112 is at least two, and they are evenly distributed in the circumferential direction, and a winglet gap is formed between adjacent winglets 112. The first support member 711 and the second support member 721 are respectively fitted with the winglets 112, so that when the adjusting member 13 rotates toward the distal end, the force-applying portion 131 can fit with the winglet 112 and squeeze the winglet 112. By applying a counter pressure to the winglet 112, the pressure is transmitted from the winglet 112 to the first support member 711 and the second support member 721, thereby realizing adaptive adjustment of the adjusting member 13; that is, the first support member 711 and the second support member 721 are both located on the inner circumference of the distal positioning portion 11 and fit with the winglet 112. When the adjusting member 13 rotates toward the distal end relative to the distal positioning portion 11, the force-applying portion 131 is used to squeeze the winglet 112, and the winglet 112 squeezes the first support member 711 and the second support member 721.

[0076] Optionally, the distal positioning portion 11 includes a plurality of fins 112 arranged at intervals along the circumferential direction.

[0077] like Figure 5 and 6 As shown, as an embodiment, the distal positioning portion 11 includes a fixed head 113 and a support seat 114, and the inner peripheral side of the fixed head 113 is provided with a first positioning portion 111 for connecting with the first valve core 3. When the distal end of the first valve core 3 is connected to the distal positioning portion 11, the structural stability between the two can be improved; the support seat 114 is provided with a wing 112, and the support seat 114 is sleeved on the outer periphery of the fixed head 113 and is detachably connected to the fixed head 113, so that the fixed head 113 can be injection molded with the first valve core 3 first, and then connected to the support seat 114 for easy assembly; the proximal positioning portion 12 is provided with a second positioning portion 121, and the fixed end portion 31 of the proximal end of the first valve core 3 is provided with a second positioning matching portion 331, and the second positioning portion 121 and the second positioning matching portion 331 are matched and connected with each other, thereby realizing the fixed connection between the proximal end of the first valve core 3 and the proximal positioning portion 12, so as to improve the structural stability of the first valve core 3 and the proximal positioning portion 12.

[0078] Of course, the fixing head 113 and the supporting seat 114 may also be an integral injection molded part, that is, the distal positioning portion 11 is an integral part.

[0079] Optionally, the fixing head 113 and the supporting base 114 may be snap-connected.

[0080] As a parallel embodiment, the distal positioning portion 11 is provided with a first positioning portion 111, and the fixed end portion 31 at the distal end of the first valve core 3 is provided with a first positioning matching portion 311. The first positioning portion 111 and the first positioning matching portion 311 are mutually connected to improve the structural stability between the two. The proximal positioning portion 12 is provided with a second positioning portion 121, and the fixed end portion 31 at the proximal end of the first valve core 3 is provided with a second positioning matching portion 331. The second positioning portion 121 and the second positioning matching portion 331 are mutually connected to improve the structural stability of the first valve core 3 and the proximal positioning portion 12. In the embodiment of the present application, the support seat 114 and the fixed head 113 are integrally injection-molded parts, that is, the distal positioning portion 11 is a single part, and the distal positioning portion 11 is also provided with multiple fins 112.

[0081] like Figure 6 As shown, optionally, the first positioning portion 111 includes a plurality of first grooves 1111 and annular protrusions 1112 arranged at circumferential intervals along the distal positioning portion 11, the annular protrusions 1112 space the first groove 1111 into two first sub-grooves, and the first positioning matching portion 311 includes a plurality of first protrusions 3111 and annular grooves 3112 arranged at circumferential intervals along the fixed end portion 31, the annular grooves 3112 space the first protrusion 3111 into two first sub-protrusions, and the annular protrusions 1112 are adapted to the annular grooves 3112, thereby increasing the injection molding contact area between the positioning portion and the first positioning matching portion 311 and improving the structural stability.

[0082] Optionally, in some cases, the first positioning portion 111 includes a plurality of first grooves 1111 arranged at circumferential intervals along the distal positioning portion 11, and the first positioning matching portion 311 includes a plurality of first protrusions 3111 arranged at circumferential intervals along the fixed end portion 31 of the distal end, or; the first positioning portion 111 includes a plurality of first protrusions 3111 arranged at circumferential intervals along the distal positioning portion 11, and the first positioning matching portion 311 includes a plurality of first grooves 1111 arranged at circumferential intervals along the fixed end portion 31 of the distal end, that is, the annular protrusions 1112 and the annular grooves 3112 are eliminated.

[0083] Optionally, the second positioning portion 121 has the same structure as the first positioning portion 111 .

[0084] like Figure 5 As shown, optionally, a second accommodating space is further provided at the distal end of the base 1, the second accommodating space is communicated with the first accommodating space, the second accommodating space is provided with a second valve core 2, the first channel is communicated with the second channel of the second valve core 2, so that the sealing valve body in the present application is provided with two valve cores, and when the instrument passes through the first valve core 3 and the second valve core 2, the two valve cores can achieve a double sealing effect, thereby improving the sealing between the instrument and the sealing valve body.

[0085] Optionally, the distal end of the second valve core 2 is a sealing end for abutting against the sheath tube 6 , and the proximal end is an opening structure.

[0086] like Figures 2 to 5 As shown, as an embodiment, the sealing valve body also includes a connecting seat 4 for accommodating the second valve core 2, the proximal end of the connecting seat 4 is connected to the distal positioning portion 11, the distal end of the distal positioning portion 11 abuts against the proximal end of the second valve core 2, and the inner circumference of the distal positioning portion 11 is provided with an annular boss 1131 for abutting the second valve core 2. When the connecting seat 4 is threadedly connected to the distal positioning portion 11, the second valve core 2 is positioned by setting the annular boss 1131 to improve the sealing effect.

[0087] Optionally, an exhaust channel 41 for exhaust is provided on the connecting seat 4.

[0088] Optionally, the outer edge of the second valve core 2 is clamped by the connecting seat 4 and the distal positioning portion 11, which can also improve the sealing performance.

[0089] like Figure 4 As shown, optionally, the sealing valve body includes a sheath tube gland 5 for connecting to the sheath tube 6 , and the sheath tube gland 5 is connected to the connecting seat 4 , thereby fixing the sheath tube 6 .

[0090] like Figure 2 and 4 As shown, as an embodiment, the sealing valve body also includes an inner membrane part 8. By providing the inner membrane part 8 and utilizing the lubricating characteristics of the inner membrane part 8 itself, it is easier for the instrument to pass through, thereby reducing the friction between the instrument and the first valve core 3; and the part of the inner membrane part 8 located inside the first valve core 3 is formed with folds, so that when the instrument passes through, the folds of the inner membrane part 8 can fill the gap between the instrument and the inner membrane part 8, thereby increasing the sealing effect of the instrument and the first valve core 3; the two ends of the inner membrane part 8 respectively extend out of the two fixed end parts 31 of the first valve core 3, so that the two ends of the inner membrane part 8 are convenient for the first clamping part 9 and the second clamping part 10 to be respectively inserted into the parts of the first valve core 3 to achieve fixation.

[0091] Preferably, the portion of the inner membrane member 8 within the first valve core 3 is not fixed relative to the first valve core 3, that is, the portion of the inner membrane member 8 located within the first valve core 3 is not adhered to the first valve core 3, which facilitates assembly and also allows the inner membrane member 8 to be unrestricted, thereby improving the sealing effect and the passability of the device. The wrinkles are formed because the unfolded length of the inner membrane member 8 located within the first valve core 3 is greater than the length of the first valve core. Therefore, when the inner membrane member 8 is folded and contracted in length and placed within the first valve core 3, undulating wrinkles are formed in the axial direction of the sealed valve body. Of course, wrinkles also include the case where the cross-sectional circumferential length of the inner membrane member 8 located within the first channel is greater than the cross-sectional circumferential length of the connecting section 32, forming undulating wrinkles in the first channel within the connecting section 32. Of course, wrinkles also include the case where the cross-sectional circumferential length of the inner membrane member 8 located within the fixed end portion 31 is greater than the cross-sectional circumferential length of the fixed end portion 31.

[0092] Optionally, the inner membrane member 8 may be an ePTFE membrane, which can improve the permeability, sealing and hydraulic resistance during the penetration of internal instruments, thereby facilitating the passage of instruments.

[0093] Optionally, the inner membrane member 8 may also be made of materials such as PTFE membrane, PVDF membrane, PP membrane, PE membrane, and nanofiber membrane.

[0094] like Figure 2 、 4 As shown in Figure 5, as an embodiment, a first clamping member 9 is provided in the base body 1, and the first clamping member 9 is located at the proximal end of the second valve core 2 and is communicated with the second valve core 2 to facilitate the passage of the instrument; one end of the first clamping member 9 is respectively abutted against the annular boss 1131 and the second valve core 2, and the other end is tightly connected with the distal end of the inner membrane member 8, that is, one end of the inner membrane member 8 is sleeved on one end of the first clamping member 9, and the first clamping member 9 is sleeved on one end of the inner membrane member 8 and inserted into the first valve core 3, and abutted against one end of the first valve core 3, so as to fix the inner membrane Part 8; the proximal end of the base 1 is also provided with a second clamping part 10, the second clamping part 10 penetrates the proximal positioning portion 12, and is tightly connected with the proximal end of the inner membrane part 8, that is, the other end of the inner membrane part 8 is sleeved on one end of the second clamping part 10, and the second clamping part 10 is sleeved on the other end of the inner membrane part 8 and inserted into the first valve core 3, and abuts against the other end of the first valve core 3 to fix the inner membrane part 8. The two ends of the inner membrane part 8 are fixed by arranging the first clamping part 9 and the second clamping part 10 to prevent the inner membrane part 8 from moving when the instrument penetrates.

[0095] Optionally, the length of the inner membrane part 8 is greater than the length of the first valve core 3, and the first clamping part 9 and the second clamping part 10 both include plug-in columns. The redundancy at both ends of the inner membrane part 8 can be mounted on the plug-in columns of the first clamping part 9 and the second clamping part 10. In this way, when the first clamping part 9 and the second clamping part 10 are respectively plugged into the two ends of the first valve core 3, they can fix the inner membrane part 8.

[0096] Optionally, the second clamping member 10 may be engaged with the proximal positioning portion 12 to improve the stability between the second clamping member 10 and the proximal positioning portion 12 .

[0097] like Figure 4 As shown, in a second aspect, an embodiment of the present application provides a guide sheath, comprising the sealing valve body provided in the first aspect and a sheath tube 6 connected to the distal end of the sealing valve body. By providing the sheath tube 6, it is possible to guide instrument intervention and, at the same time, protect the blood vessel and reduce the risk of instrument scratching the blood vessel wall.

[0098] Optionally, the sheath 6 is an expandable sheath.

[0099] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0100] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0101] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A sealing valve body, characterized in that: The device comprises a base, a first valve core disposed in the base, a pressing mechanism for pressing the first valve core, and an adjusting member assembled on the base and capable of moving relative to the base to apply force to the pressing mechanism; The base has a first accommodating space, and the first valve core is located in the first accommodating space; The first valve core is provided with a first passage running through it; The pressing mechanism includes an elastic member pre-compressed in a radial direction of the first valve core.

2. The sealing valve body according to claim 1, characterized in that: The first valve core includes two fixed ends fixed to the base and a connecting section located between the two fixed ends. The radial dimension of the connecting section is smaller than the radial dimension of the two fixed ends. The elastic member is located in the radial direction of the connecting section.

3. The sealing valve body according to claim 2, characterized in that: The extrusion mechanism includes at least two elastic members, and the two elastic members are respectively located on opposite sides of the connecting section in the radial direction.

4. The sealing valve body according to claim 3, characterized in that: The extrusion mechanism includes a first extrusion component and a second extrusion component, the first extrusion component and the second extrusion component are respectively located on opposite sides of the connecting section, the first extrusion component includes a first abutment member for abutting against the connecting section, and the second extrusion component includes a second abutment member for abutting against the connecting section; one end of the two elastic members abuts against the first abutment member and the second abutment member respectively.

5. The sealing valve body according to claim 4, characterized in that: The first extrusion assembly also includes a first support member, and the second extrusion assembly also includes a second support member, wherein the two ends of one of the elastic members respectively abut against the first support member and the first abutment member; the two ends of the other elastic member respectively abut against the second support member and the second abutment member.

6. The sealing valve body according to claim 4 or 5, characterized in that: The first abutting member and the second abutting member are respectively provided with corresponding extrusion grooves, and the connecting section is located in the extrusion grooves.

7. The sealing valve body according to claim 6, characterized in that: The first abutment member includes at least two first protruding teeth protruding toward the connecting section, and a recess is formed between two adjacent first protruding teeth; the second abutment member includes at least one second protruding tooth for pressing toward the recess, and the first protruding tooth and the second protruding tooth are respectively arranged in the extrusion groove.

8. The sealing valve body according to claim 5, characterized in that: The first supporting member and the second supporting member are slidably connected.

9. The sealing valve body according to claim 5, characterized in that: The first support member is provided through both sides perpendicular to the axial direction of the first valve core, and the first abutment member includes a protrusion that is engaged with the through-hole area, and the protrusion can slide along the through-hole area; The second supporting member is provided with a cavity for accommodating the second abutting member, and the second abutting member is slidable in the cavity.

10. The sealing valve body according to claim 5, characterized in that: The adjusting member includes a force applying portion that can apply force to the extrusion mechanism. When the adjusting member moves relative to the base, the force applying portion squeezes the first supporting member and the second supporting member, causing the first abutting member and the second abutting member to squeeze the connecting section respectively.

11. The sealing valve body according to claim 5, characterized in that: A clamping portion for positioning with the base is respectively provided on one side of the first support member and the second support member facing the base.

12. The sealing valve body according to claim 5, characterized in that: The base includes a distal positioning portion and a proximal positioning portion, and the two fixed ends of the first valve core are respectively fixed to the distal positioning portion and the proximal positioning portion; the distal positioning portion is provided with a wing extending toward the proximal direction, and the wing is provided with an external thread; The adjusting member is provided with an internal thread matched with the external thread, and the adjusting member is rotated relative to the wing so as to be movable in the axial direction.

13. The sealing valve body according to claim 12, characterized in that: The number of the fins is at least two and they are evenly distributed in the circumferential direction. Adjacent fins are arranged at intervals. The force applying portion presses the first support member and the second support member by pressing the fins.

14. The sealing valve body according to claim 12, characterized in that: The distal positioning portion includes a fixed head and a support seat, the inner circumference of the fixed head is provided with a first positioning portion for connecting with the first valve core, the distal fixed end is provided with a first positioning matching portion, the support seat is provided with the wing, and the support seat is sleeved on the outer circumference of the fixed head and is detachably connected to the fixed head; The proximal positioning portion is provided with a second positioning portion, the proximal fixed end portion is provided with a second positioning matching portion, and the second positioning portion and the second positioning matching portion are matched and connected with each other.

15. The sealing valve body according to claim 12, characterized in that: The distal positioning portion is provided with a first positioning portion, and the distal fixed end is provided with a first positioning matching portion, and the first positioning portion and the first positioning matching portion are mutually matched and connected; The proximal positioning portion is provided with a second positioning portion, the proximal fixed end portion is provided with a second positioning matching portion, and the second positioning portion and the second positioning matching portion are matched and connected with each other.

16. The sealing valve body according to claim 12, characterized in that: The sealing valve body also includes a connecting seat for accommodating a second valve core, the proximal end of the connecting seat is connected to the distal positioning portion, the distal end of the distal positioning portion abuts against the proximal end of the second valve core, and an annular boss is provided on the inner circumference of the distal positioning portion for abutting against the second valve core.

17. The sealing valve body according to claim 16, characterized in that: The sealing valve body further includes an inner membrane member, two ends of which extend out of two fixed ends of the first valve core respectively, and a portion of the inner membrane member located inside the first valve core is formed with folds.

18. The sealing valve body according to claim 17, characterized in that: A first clamping member is provided in the base body. The first clamping member is located at the proximal end of the second valve core and is communicated with the second valve core. One end of the first clamping member abuts against the annular boss and the second valve core respectively, and the other end is tightly connected with the distal end of the inner membrane member and abuts against one end of the first valve core. A second clamping piece is further provided at the proximal end of the base body. The second clamping piece penetrates the proximal end positioning portion, is tightly fitted and connected with the proximal end of the inner membrane piece, and abuts against the other end of the first valve core.

19. An introducer sheath, characterized in that: It comprises the sealing valve body according to any one of claims 1 to 18 and a sheath connected to the distal end of the sealing valve body.

Images