CN116983543A

CN116983543A - Hemostatic valve

Info

Publication number: CN116983543A
Application number: CN202310986275.6A
Authority: CN
Inventors: 扈昕瞳; 董乐乐; 夏顺
Original assignee: Shanghai Tendfo Medical Technologies Co Ltd
Current assignee: Shanghai Tendfo Medical Technologies Co Ltd
Priority date: 2023-08-07
Filing date: 2023-08-07
Publication date: 2023-11-03

Abstract

The invention provides a hemostatic valve. It comprises the following steps: the valve comprises a shell, a valve tube far-end seat, a valve tube near-end seat and a control assembly; the valve tube is arranged in the shell, and the valve tube can axially shrink along the valve tube to form a tubular passage and radially shrink when stretched to seal an instrument introduced into the valve tube or shut off the valve tube; the valve tube far end seat is fixedly arranged in the positioning cavity of the shell and is connected with the far end of the valve tube; the valve tube proximal end seat is arranged in the movable cavity and is connected with the proximal end of the valve tube; the control assembly is arranged on the shell and is connected with the valve tube proximal seat, and the control assembly can lock the valve tube proximal seat on the shell and drive the valve tube proximal seat to axially move in the movable cavity along the valve tube. The embodiment of the invention realizes the tightness or complete closure of the vascular access by utilizing the radial tightening force generated by the thinning of the valve tube during the stretching, not only can meet the sealing hemostasis requirement of large-size instruments, but also has simple operation and good hemostasis effect.

Description

Hemostatic valve

Technical Field

The invention relates to the technical field of medical instruments, in particular to a hemostatic valve.

Background

Minimally invasive surgery is typically treated on the basis of establishing vascular access. Based on the prior art, access products often avoid intraoperative blood loss by adding a hemostatic valve. The current medical silica gel circle that adopts mostly is as the hemostasis valve, realizes closing and opening of passageway through oppression or release silica gel circle, but the silica gel circle deformation scope is comparatively limited, is difficult to satisfy the complete closure of jumbo size vascular access. In addition, some hemostatic valves realize the opening and closing of the channel by adjusting the pressure in the sealing cavity, so that the complexity of operation is increased.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The embodiment of the invention aims to provide the hemostatic valve, which realizes the tightness or complete closure of a vascular access by utilizing radial tightening force generated by thinning of a valve tube during stretching, can meet the sealing hemostatic requirement of large-size instruments, and has the advantages of simple operation and good hemostatic effect.

In order to solve the above technical problems, an embodiment of the present invention provides a hemostasis valve, including:

the shell is cylindrical and provided with a positioning cavity and a movable cavity;

a valve tube disposed within the housing and capable of collapsing axially on itself to form a tubular passageway and radially collapsing when stretched to seal an instrument introduced into the valve tube or to shut off the valve tube;

the valve tube far-end seat is fixedly arranged in the positioning cavity and is connected with the far end of the valve tube;

the valve tube proximal end seat is arranged in the movable cavity and is connected with the proximal end of the valve tube; and

the control assembly is arranged on the shell and connected with the valve tube proximal end seat, and can lock the valve tube proximal end seat to the shell and drive the valve tube proximal end seat to move in the movable cavity along the valve tube axial direction.

As one embodiment, the valve tube comprises a woven mesh tube and an elastic membrane tube penetrating and fixed in the woven mesh tube to form an inner wall of the valve tube; the woven mesh tube is tubular in a natural state and can radially shrink along with axial extension;

optionally, the elastic membrane tube is made of the following materials: TPU or silica gel.

As an embodiment, the woven mesh tube is formed by adopting a plurality of shape memory woven wires which are spirally and alternately woven in the forward and reverse directions;

optionally, the diameter of the braided wire is 0.001-0.5 mm;

optionally, the number of the knitting yarns is 1-72.

As an embodiment, the valve tube distal end seat and the valve tube proximal end seat are respectively a distal threading plate and a proximal threading plate, and the distal threading plate and the proximal threading plate are both provided with instrument guide holes; the distal threading plate and the proximal threading plate are provided with a plurality of threading holes, and the threading holes are uniformly distributed around the instrument guide hole;

the woven mesh tube comprises a plurality of woven wires, wherein two ends of each woven wire are penetrated out of two wire penetrating holes of one of the far-end wire penetrating plate and the near-end wire penetrating plate, and are penetrated out of two wire penetrating holes of the other wire penetrating plate and connected end to end after weaving is completed; or,

the woven mesh tube is formed by weaving one woven wire, and correspondingly, the woven wire passes back and forth for a plurality of times and passes through the wire penetrating holes of the far-end wire penetrating plate and the near-end wire penetrating plate, and finally penetrates out from the two wire penetrating holes on the far-end wire penetrating plate or the near-end wire penetrating plate and is connected end to end.

As an embodiment, the control assembly comprises two button mechanisms, and the two button mechanisms are respectively connected with two ends of the valve tube proximal seat;

each button mechanism comprises: the button comprises a button body, a torsion spring, a sliding block and a friction part;

sliding grooves which extend along the axial direction of the valve tube are formed in the two side walls of the shell;

the sliding block comprises a sliding head and a rotating shaft which are integrally connected, one end of the button body is rotationally connected with the rotating shaft, the rotating shaft is sleeved with the torsion spring, the sliding head stretches into the sliding groove and is connected with the valve tube near-end seat, and the friction part is arranged at one end, close to the sliding block, of the button body and is propped against and frictionally locked on the shell under the action of the torsion spring.

As an embodiment, the valve tube far-end seat and the valve tube near-end seat are annular plates, clamping blocks are convexly arranged at two ends of the valve tube near-end seat, and the sliding head is provided with clamping grooves matched with the clamping blocks; the clamping block stretches into the clamping groove and is fixedly connected with the sliding head.

As an embodiment, the friction part is a silicon sheet.

As an embodiment, the housing has a locking surface opposite and in sliding engagement with the button body, the silicone piece frictionally locking with the locking surface.

As an embodiment, the number of the torsion springs is two, a baffle is arranged in the middle of the rotating shaft, and the two torsion springs are respectively sleeved on two sides of the baffle.

As an embodiment, the shell is cylindrical and has two closed ends, an annular partition plate is arranged in the shell, the annular partition plate divides the shell into the positioning cavity and the movable cavity, and the two ends of the shell and the center of the annular partition plate are provided with radially aligned instrument guide holes;

optionally, the shell comprises an upper shell and a lower shell, and opposite sides of the upper shell and the lower shell are connected with the pin hole through a pin shaft.

According to the technical scheme, the invention has at least the following advantages and positive effects:

according to the hemostatic valve disclosed by the embodiment of the invention, the valve tube far-end seat is fixedly arranged in the positioning cavity of the shell, the valve tube near-end seat is movably arranged in the movable cavity of the shell, the valve tube far-end is fixed through the valve tube far-end seat, the valve tube near-end is pulled through the valve tube near-end seat so that the valve tube can axially stretch, a tubular passage can be formed through an instrument when the valve tube is contracted, the control assembly can drive the valve tube near-end seat to drive the valve tube near-end to move to the near-end, and the valve tube can be stretched to radially contract to generate tightening force so as to seal or completely shut off the introduced instrument, meanwhile, the control assembly can lock the valve tube near-end seat in the shell to keep the working state of the valve tube, and the tubular passage of the valve tube can meet the introduction requirement of large-size instruments.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being understood that the drawings in the following description are only embodiments of the present invention and that other drawings may be obtained according to the drawings provided without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the overall structure of a hemostatic valve according to an embodiment of the present invention;

FIG. 2 is a schematic view of the lower housing of the hemostatic valve shown in FIG. 1;

fig. 3 is a schematic structural view of a valve tube of the hemostatic valve according to an embodiment of the present invention in an open state;

FIG. 4 is a schematic view of the valve tube of FIG. 3 in an extended closed position;

FIG. 5 is a schematic view of a hemostatic valve according to an embodiment of the present invention with an upper housing removed and a button in a locked state;

FIG. 6 is a schematic view of the hemostatic valve of FIG. 5 with the push button in an unlocked movable state;

FIG. 7 is a schematic view of the hemostatic valve of FIG. 6 with the valve tube in a closed position;

fig. 8 is a schematic structural view of a manipulation assembly of a hemostatic valve according to an embodiment of the present invention;

FIG. 9 is a schematic view of a slider of the steering assembly shown in FIG. 8;

fig. 10 is a schematic structural view of a button body of the manipulation assembly shown in fig. 8.

In the figure: 1. a housing; 101. an upper housing; 102. a lower housing; 103. a chute; 104. an annular partition plate; 105. a positioning cavity; 106. a movable cavity; 107. a locking surface; 108. an instrument guide hole at the distal end of the housing; 109. an instrument guide hole of the annular partition plate; 110. a proximal instrument guide hole; 111. a pin shaft; 112. a pin hole; 2. a valve tube; 21. a network manager; 22. an elastic membrane tube; 3. a valve tube distal seat; 31. a bump; 4. a valve tube proximal seat; 51. a button body; 511. a pressing part; 512. a pushing part; 513. a shaft hole; 52. a torsion spring; 53. a friction part; 54. a slide block; 541. a slider; 542. a rotating shaft; 543. a clamping groove; 544. and a baffle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present invention. However, the claimed invention may be practiced without these specific details and with various changes and modifications based on the following embodiments.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

It should be noted that, unless explicitly stated otherwise, the terms "connected," "connected," and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.

In the description of the present invention, it should be noted that, in the field of interventional medical devices, the proximal end refers to the end closer to the operator, and the distal end refers to the end farther from the operator. The above definitions are for convenience of description only and are not to be construed as limiting the invention.

Example 1

Referring to fig. 1-10, a first embodiment of the present invention provides a hemostatic valve for sealing hemostatic devices introduced into a vascular access or for closing a vascular access. The hemostatic valve of the present embodiment mainly includes: a housing 1, a valve tube 2, a valve tube distal seat 3, a valve tube proximal seat 4, and a steering assembly.

The housing 1 is cylindrical and has a positioning chamber 104 and a movable chamber 106. The valve tube 2 is arranged in the shell 1, the valve tube 2 can axially shrink along the valve tube 2 to form a tubular passage, namely, the valve tube 2 is in an axially shrinking state in a natural state, at the moment, the section of the valve tube 2 is larger, the introduction of instruments is facilitated, and the valve tube 2 can be in a cylindrical tubular shape. The valve tube 2 radially contracts to seal the instrument introduced into the valve tube 2 or to shut off the valve tube 2 when stretched, i.e., the valve tube 2 radially contracts to generate a radial binding force or tightening force so that the inner wall of the valve tube 2 is pressed against the outer peripheral wall of the introduced instrument and is in contact with the same, or when the instrument is withdrawn, the inner walls of the valve tube 2 radially contract to each other and eliminate the gap in the valve tube 2, thereby completely closing the valve tube 2 and closing the vascular access.

The valve tube distal end seat 3 is fixedly arranged in the positioning cavity 105 and is connected with the distal end of the valve tube 2. The valve tube distal hub 3 is positioned within the housing and is sealingly connectable to the proximal end of the catheter or sheath establishing the vascular access such that the valve tube becomes part of the vascular access. The valve tube proximal seat 4 is disposed within the movable cavity 106 and is connected to the proximal end of the valve tube 2, the valve tube proximal seat 4 being axially movable within the movable cavity 106 relative to the housing 1 to extend or retract the valve tube 2.

The control component is arranged on the shell 1 and is connected with the valve tube proximal seat 4, the control component can lock the valve tube proximal seat 4 on the shell 1, so that the valve tube is kept in a current opening, sealing or closing state, the control component can also drive the valve tube proximal seat 4 to axially move along the valve tube 2 in the movable cavity 106 so as to drive the valve tube 2 to axially stretch, so that an instrument can be introduced when the valve tube 2 is opened to a larger size, the valve tube 2 can be pulled to be elongated by moving the valve tube proximal seat 4 to the proximal end after the instrument is introduced, the valve tube 2 is compressed on the outer surface of the introduced instrument after being radially contracted and is in contact with the outer surface of the introduced instrument for sealing, and under the condition that the instrument is completely withdrawn, the valve tube 2 can be pulled to generate enough radial tightening force, so that the interior of the valve tube 2 is mutually extruded to eliminate gaps, and then the instrument is completely closed.

With continued reference to fig. 3-4, the valve tube 2 may include a woven mesh tube 21 and an elastic membrane tube 22 that is inserted into and fixed to the woven mesh tube 21 to form an inner wall of the valve tube 2.

The elastic membrane tube 22 is arranged in the woven mesh tube 21 in a penetrating manner and is fixedly connected with the woven mesh tube 21, the outer wall of the elastic membrane tube 22 can be fixedly adhered to the inner wall of the woven mesh tube 21, or the elastic membrane tube 22 is fixedly connected with the woven mesh tube 21 in other suitable manners, so that the elastic membrane tube 22 can synchronously deform along with the woven mesh tube 21, for example, when the woven mesh tube 21 is in a cylindrical tube shape, the elastic membrane tube 21 synchronously takes a cylindrical tube shape, and when the woven mesh tube 21 is stretched to radially taper, the elastic membrane tube 22 is also stretched and radially thinned along with the woven mesh tube. It will be appreciated that the elastic membrane tube 21 should completely cover the inside of the tube body of the woven mesh tube 21 to avoid blood loss from the mesh holes of the woven mesh tube 21.

The woven mesh tube 21 is tubular in nature and radially contractible as it axially expands. The woven mesh tube 21 may be woven from wire having shape memory. The braiding structure and shape memory capability of the braided mesh tube 21 enable the braided mesh tube to axially shrink in a natural state and to be in a cylindrical tube shape, and can be radially thinned by receiving radial tightening force when being stretched, and radial tightening force is applied to the elastic membrane tube 22 in the braided mesh tube to radially tighten the elastic membrane tube 22, so that the elastic membrane tube 22 forms sealing force, and the sealing hemostatic effect on an introduced instrument is achieved or the valve tube 2 is completely closed and then the vascular access is closed when no introducing instrument is provided. Therefore, the size of the woven mesh tube 21 and the elastic membrane tube 22 can be set according to the size of the instrument to be introduced, and since the sealing performance thereof does not depend on the deformability of the elastic membrane tube 22 itself, a good sealing effect can be achieved for any size of instrument.

The elastic membrane tube 22 can be made of the following materials: TPU or silica gel. The thermoplastic polyurethane (Thermoplastic polyurethanes, TPU) and the silica gel elastic film can be manufactured by adopting processes of electrostatic spinning, spraying, infiltration and the like. The material and the preparation process of the elastic membrane tube 22 are not excessively limited in this embodiment.

The woven mesh tube 21 can be formed by adopting a plurality of shape memory woven wires which are spirally woven in a positive and negative direction in a staggered manner, and the spirally woven wires enable the woven mesh tube 21 to generate radial tightening force when being stretched and enable the elastic membrane tube 22 to generate radial sealing force. The shape memory braided wire can be nickel-titanium alloy wire, and the diameter of the braided wire can be 0.001-0.5 mm. The number of the knitting yarns may be 2 to 72. The finer the braid wires, the more the number of wires, the denser the mesh of the braid mesh tube 21, and the more uniform the radial pressure on the elastic membrane tube 22 when elongated and thinned.

The valve tube distal end seat 3 and the valve tube proximal end seat 4 may be a distal threading plate and a proximal threading plate, respectively, each of which is provided with an instrument guide hole, and the instrument guide holes 42 of the valve tube proximal end seat 4 may be used to guide an instrument to penetrate from the proximal end, and the instrument guide holes of the valve tube distal end seat 3 may guide an instrument to penetrate out of the distal end of the housing 1. The distal threading plate and the proximal threading plate are respectively provided with a plurality of threading holes, and the threading holes are uniformly distributed around the instrument guide holes. The size of the hole diameter of the threading hole is suitable for threading the braiding wire, and the threading hole is not particularly limited.

When the woven mesh tube is formed by weaving a plurality of woven wires, two ends of each woven wire are penetrated out of two wire penetrating holes of one of the far-end wire penetrating plate and the near-end wire penetrating plate, and after weaving, the two ends of each woven wire are penetrated out of two wire penetrating holes of the other wire penetrating plate and are connected end to end. Each woven wire is connected end to end into a whole, and the risks of the scattered, deformed or broken wire heads can not occur under the condition of multiple operations.

The woven mesh tube can also be formed by weaving one woven wire, and the woven wire can go back and forth for many times and pass through the wire penetrating holes of the far-end wire penetrating plate and the near-end wire penetrating plate to be spirally woven, and finally penetrates out from the two wire penetrating holes on the far-end wire penetrating plate or the near-end wire penetrating plate and is connected end to end. Similarly, when the braided filaments are integrated, there is no risk of the filament head being scattered, deformed or broken in the case of multiple operations.

With continued reference to fig. 2, the casing 1 is cylindrical and has two closed ends, the casing 1 is provided with an annular partition plate 104, the annular partition plate 104 partitions the casing 1 into a movable cavity 106 of a positioning cavity 105, the two ends of the casing 1 and the center of the annular partition plate 104 are respectively provided with radially aligned instrument guide holes 108 at the distal end of the casing 1, the instrument guide holes 109 on the annular partition plate 104 and the instrument guide holes 110 at the proximal end of the casing 1 are respectively the same in size and are radially aligned.

The housing 1 may include an upper case 101 and a lower case 102, and opposite sides of the upper case 101 and the lower case 102 are connected by a pin 111 and a pin hole 112. The pin 111 may be a cylindrical pin or a hexagonal pin. The two side walls of the shell 1 are provided with sliding grooves 103 extending along the axial direction of the valve tube 2, and the sliding grooves 103 can be formed in the middle of the side surface of the shell 1. The housing 1 may also have a locking surface 107 opposite and in sliding engagement with the button body of the steering assembly (see below), the locking surface 107 being adapted to cooperate with the friction portion 53 of the steering assembly to effect a friction locking of the valve tube proximal seat 4. The locking surfaces 107 are symmetrically disposed on both sides of the chute 103. The locking surface 107 may be planar, reducing machining difficulties. The housing 1 may be made of ABS. It is to be understood that the material, shape, etc. of the housing 1 are not particularly limited in this embodiment.

With continued reference to fig. 8-10, the control assembly includes two button mechanisms that are respectively connected to two ends of the valve tube proximal seat 4. Each button mechanism comprises: button body 51, torsion spring 52, slider 54, and friction portion 53.

The slider 54 may include an integrally connected slider 541 and a spindle 542. One end of the button body 51 is rotatably connected to the rotation shaft 542. The button body 51 may include a pressing portion 511, a pushing portion 512, and a shaft hole 513. The rotating shaft 542 penetrates the shaft hole 513. The torsion spring 52 is sleeved on the rotating shaft 542, the sliding head 541 extends into the sliding groove 103 and is connected with the valve tube proximal seat 4, and the friction part 53 is arranged at one end of the button body 51, which is close to the sliding block 54, and is abutted against and frictionally locked on the housing 1 under the action of the torsion spring 52. Torsion spring 52 may be made from 304 wire. Both the sliding chute 103 and the sliding head 541 can be rectangular and have shapes adapted to facilitate sliding of the sliding head 541 in the sliding chute 103.

The valve tube distal end seat 3 and the valve tube proximal end seat 4 may be annular plates, such as the threading plate structure in the foregoing embodiments, and the two ends of the valve tube proximal end seat 4 are convexly provided with the clamping blocks 41, and the sliding head 541 is provided with a clamping groove 543 adapted to the clamping blocks 41. The clamping block 41 extends into the clamping groove 543 and is fixedly connected with the sliding head 541, and the clamping block 41 can be bonded and fixed with the clamping groove 543 through glue after being clamped.

The friction portion 53 may be a silicone sheet. The number of the silica gel sheets is two, and the silica gel sheets can be symmetrically arranged on the button body 51. The silicone piece is frictionally locked to the locking surface 107. The silicone sheet may be rectangular in shape, sized to match the locking surface 107 and enable effective friction limiting.

The number of the torsion springs 52 can be two, a baffle 544 can be arranged in the middle of the rotating shaft 542, and the two torsion springs 52 are respectively sleeved on two sides of the baffle 544.

The shape and size of the valve tube distal end seat 3 may be the same as those of the valve tube proximal end seat 4. The projection 31 on the valve tube distal end seat 3 can cooperate with a positioning structure in the positioning cavity 105 to achieve accurate positioning of the valve tube distal end seat 3.

Referring to fig. 1 and fig. 5 to 7, the method for using the hemostatic valve according to the embodiment of the invention is as follows:

in the initial position, the valve tube 2 axially contracts and takes a cylindrical tubular shape under the shape memory of the woven mesh tube 21, and the elastic membrane tube 22 takes the same cylindrical tubular shape along with the shape of the woven mesh tube 21. The button body 51 is tilted away from the housing 1 by the torsion spring 52, and the pressing portion 511 is angled away from the chute 103 of the housing 1, and at this time, the friction portion 53 is pressed against the locking surface 107 of the housing 1, so that the hemostatic valve is in a large-sized vascular access locking state, and a large-sized instrument can be introduced. When the instrument needs to be sealed after being introduced, the button body 51 is pressed and the acting force of the torsion spring 52 is overcome to rotate the button body 51, the friction part 53 rotates along with the button body 51 and is separated from the locking surface 107 of the shell 1, the button body 51 is pushed to the near end to drive the sliding block 54 and the valve tube near end seat 4 to synchronously move to the near end relative to the shell 1, the valve tube far end seat 3 is static relative to the shell 1, the valve tube 2 is pulled from the near end to axially stretch, the middle part is radially thinned, and the elastic membrane tube 22 is synchronously stretched and is pressed on the outer peripheral wall of the introduced instrument by the radial extrusion force of the woven mesh tube 21 to realize contact sealing. When the instrument is withdrawn from the valve tube 2, and after the valve tube 2 is stretched to a certain length, the radial tightening force of the woven mesh tube 21 compacts the elastic membrane tube 22 and fills the inner space of the woven mesh tube 21, so that the gap inside the valve tube 2 can be eliminated, the valve tube 2 is closed, the vascular access is blocked, and the blood flow is completely closed. Subsequently, the button bodies 51 on the two sides are released, the button bodies 51 are reversely rotated and tilted under the action of the torsion springs 52, the friction parts 53 are pressed on the locking surfaces 107 of the shell 1, and the valve tube proximal seat 4 is locked on the shell 1 through friction force, so that the position locking of the valve tube 2 is realized.

When the hemostatic valve needs to be opened again, the button body 51 is pressed, the button body 51 is moved distally, the sliding block 54 and the valve tube proximal seat 4 are driven to move distally until the valve tube 2 is restored to the cylindrical shape, the hemostatic valve is opened, and after the button body 51 is released, the button body 51 is rotated again, so that the friction part 53 is in friction locking with the locking surface 107.

Compared with the prior art, the embodiment of the invention has the advantages that the valve tube far-end seat is fixedly arranged in the positioning cavity of the shell, the valve tube near-end seat is movably arranged in the movable cavity of the shell, the valve tube far-end is fixed through the valve tube far-end seat, the valve tube near-end is pulled through the valve tube near-end seat to enable the valve tube to axially stretch, the valve tube forms a tubular passage when being contracted and can pass through the instrument, the control assembly can drive the valve tube near-end seat to drive the valve tube near-end to move to the near-end, and the valve tube can be stretched to radially contract to generate tightening force so as to seal or completely shut off the introduced instrument, meanwhile, the control assembly can lock the valve tube near-end seat in the shell to keep the working state of the valve tube, and the tubular passage of the valve tube can meet the introduction requirement of large-size instruments.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. A hemostatic valve, comprising:

2. The hemostatic valve according to claim 1, wherein the valve tube comprises a woven mesh tube and an elastic membrane tube threaded and secured within the woven mesh tube to form an inner wall of the valve tube; the woven mesh tube is tubular in a natural state and can radially shrink along with axial extension;

3. The hemostatic valve according to claim 2, wherein the woven mesh tube is formed by a plurality of shape memory woven wires woven in a forward and reverse spiral staggered manner;

optionally, the diameter of the braided wire is 0.001-0.5 mm;

optionally, the number of the knitting yarns is 1-72.

4. A haemostatic valve according to claim 3, wherein the valve tube distal seat and the valve tube proximal seat are respectively a distal threading plate and a proximal threading plate, each of which is provided with an instrument guide hole; the distal threading plate and the proximal threading plate are provided with a plurality of threading holes, and the threading holes are uniformly distributed around the instrument guide hole;

5. The hemostatic valve according to claim 1 wherein the manipulation assembly comprises two button mechanisms and the two button mechanisms are respectively connected to two ends of the valve tube proximal seat;

6. The hemostatic valve according to claim 5, wherein the valve tube distal end seat and the valve tube proximal end seat are both annular plates, and the valve tube proximal end seat is provided with a fixture block protruding from both ends thereof, and the sliding head is provided with a fixture groove adapted to the fixture block; the clamping block stretches into the clamping groove and is fixedly connected with the sliding head.

7. The hemostatic valve according to claim 5 wherein the friction portion is a silicone sheet.

8. The hemostatic valve according to claim 7 wherein the housing has a locking surface opposite and in sliding engagement with the button body, the silicone frictionally locking with the locking surface.

9. The hemostatic valve according to claim 5, wherein the number of the torsion springs is two, a baffle is disposed in the middle of the rotating shaft, and the two torsion springs are respectively sleeved on two sides of the baffle.

10. The hemostatic valve according to claim 1, wherein the housing is cylindrical and has both ends closed, an annular partition plate is provided in the housing, the annular partition plate partitions the housing into the positioning cavity and the movable cavity, and radially aligned instrument guide holes are provided at both ends of the housing and at the center of the annular partition plate;