Catheter sheath

Abstract

The invention relates to a catheter sheath, comprising: a three-way joint; the sheathing canal is connected with the three-way connector; the far end of the elastic sealing piece is connected with the three-way connector; the supporting piece is arranged on the periphery of the elastic sealing piece in a sleeving mode, the far-end side of the supporting piece is fixedly connected with the near-end side of the three-way connector, and a plurality of penetrating sliding grooves extending in the radial direction are formed in the supporting piece in the circumferential direction; the plurality of sliding block units are in one-to-one correspondence with the plurality of through sliding grooves, and are arranged in the corresponding through sliding grooves in a sliding manner; and the rotary knob is rotatably arranged on the supporting piece in a sleeving mode so as to drive the sliding block unit to move in the radial direction to extrude or release the elastic sealing piece. The catheter sheath is convenient to operate and good in sealing effect, and can adapt to various interventional instruments with different sizes.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a catheter sheath. Background Art

[0002] During the implementation of arteriovenous interventional surgery, the catheter sheath plays an important role. It can effectively reduce the damage to the access blood vessels, prevent blood loss and air from entering the blood vessels, and establish a safe access channel for other interventional devices to enter the human blood vessels.

[0003] In actual surgery, the diameters of the devices that enter the blood vessels through the catheter sheath sometimes vary greatly. The catheter sheath needs to pass through a guidewire with a diameter of about 1mm and a stent delivery system with a diameter of about 5-8mm, or it needs to pass through multiple devices at the same time, such as a large-sized dilator or delivery system plus angiography catheter, and these devices need to pass smoothly through the catheter sheath.

[0004] Existing catheter sheaths have problems such as difficult operation and poor sealing effect, which places high demands on doctors and increases the risk of surgical failure. Summary of the invention

[0005] Based on this, it is necessary to provide a catheter sheath to address the above problems, comprising: a three-way joint; a sheath tube connected to the three-way joint; an elastic seal, whose distal end is connected to the three-way joint; a support member, which is sleeved on the outer periphery of the elastic seal and the distal end is fixedly connected to the proximal end of the three-way joint, and the support member is circumferentially provided with a plurality of radially extending through grooves; a plurality of slider units, a plurality of the sliding units correspond one-to-one to a plurality of the through grooves, and are slidably arranged in the corresponding through grooves; a knob, which is rotatably sleeved on the support member to drive the slider unit to move radially to squeeze or release the elastic seal.

[0006] Furthermore, the slider unit is provided with a first wedge-shaped surface; and the inner wall of the knob is provided with a second wedge-shaped surface matching with the first wedge-shaped surface.

[0007] Furthermore, it also includes a threaded fixing sleeve, which is fixedly sleeved on the proximal side of the support member, and the inner wall of the knob is provided with a knob internal thread that is threadably matched with the threaded fixing sleeve.

[0008] Furthermore, the proximal side of the threaded fixing sleeve has a bottom wall, the proximal end of the elastic sealing member has a proximal end portion, and the bottom wall can press the proximal end portion against the proximal surface of the supporting member.

[0009] Furthermore, a limiting protrusion is provided on the periphery of at least one side of the through-channel, and the limiting protrusion is flush with the inner wall surface of the through-channel.

[0010] Furthermore, the slider unit is also provided with transmission teeth, and the proximal side of the support is rotatably connected with a plurality of gear units corresponding one to the slider unit, and each of the gear units is engaged with the transmission teeth; internal transmission teeth are provided inside the knob, and the internal transmission teeth are engaged with the gear units.

[0011] Furthermore, the through slide groove includes a first through slide groove unit, which is formed by a portion of the proximal surface of the support member being recessed toward the distal end, and a slide groove limiting portion is also provided on the side wall of the first through slide groove unit, and a slider limiting portion cooperating with the slide groove limiting portion is also provided on the outer periphery of the slider unit.

[0012] Furthermore, it also includes a sealing sheet, which is arranged on the proximal side or the distal side of the elastic sealing member.

[0013] Furthermore, a convex portion or a concave portion is provided on the outer periphery of the elastic sealing member, and the slider unit abuts against the convex portion or the concave portion.

[0014] Furthermore, a PTFE film is arranged inside the elastic sealing component.

[0015] The technical solution of the present invention has the following beneficial effects:

[0016] The present invention adopts a mechanical extrusion structure. By turning the knob, the knob can drive the slider to move radially to squeeze the elastic seal, so as to adaptively adjust the sealing inner diameter of the elastic seal, thereby achieving a good sealing effect. The operation process is simple and quick, which greatly reduces the operation difficulty and operation time and improves the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the catheter sheath in the first embodiment;

[0018] Figure 2 is a cross-sectional view of the catheter sheath in the first embodiment;

[0019] Figure 3 is an overall exploded view of the catheter sheath in the first embodiment;

[0020] Figure 4 is a cross-sectional view of the elastic sealing member in the first embodiment;

[0021] Figure 5 is a three-dimensional structural diagram of the support member in the first embodiment;

[0022] Figure 6 It is a partial structural exploded view of the catheter sheath in the first embodiment;

[0023] Figure 7 is a cross-sectional view of the knob in the first embodiment;

[0024] Figure 8 is a three-dimensional structural diagram of a fixed threaded sleeve in the first embodiment;

[0025] Fig. 9 is a schematic diagram of the overall structure of the catheter sheath in the second embodiment;

[0026] Fig.10 is a cross-sectional view of a catheter sheath in a second embodiment;

[0027] Fig.11 is an overall exploded view of the catheter sheath in the second embodiment;

[0028] Fig.12 is a structural diagram of a slider unit in the second embodiment;

[0029] Fig.13 In the second embodiment Fig. 9 The cross-section diagram at AA;

[0030] Fig.14 is a structural diagram of a support member in a second embodiment; DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "upper", "lower", "left", "right" and similar expressions used to indicate directions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] It should be noted that, for medical devices, the end of the medical device that is relatively close to the operator is generally called the "proximal end", and the end of the medical device that is relatively far from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of the delivery system are defined based on this principle; "axial" or "longitudinal axis" refers to the direction parallel to the line connecting the distal center and the proximal center of the medical device; "radial" or "transverse axis" refers to the direction perpendicular to the axial direction. In addition, the term "multiple" used herein refers to two or more, including two.

[0035] First embodiment

[0036] See also Figure 1 As shown, this embodiment provides a catheter sheath 10 for establishing a safe access channel for other interventional instruments to enter human blood vessels, including a three-way connector 12, and a side branch that can be externally connected to a hose and a three-way valve (not shown in the figure) is arranged on the periphery of the three-way connector 12. The distal end of the three-way connector 12 is connected to the proximal end of the sheath tube 11, and the proximal end is fixedly connected to a support member 13, and a knob 14 is also sleeved on the periphery of the support member 13.

[0037] See also Figure 2-3 As shown, the overall structure of the catheter sheath 10 is further described. The catheter sheath 100 has a three-way joint 12, the distal end of the three-way joint 12 is connected to the sheath tube 11, and the proximal end is fixedly connected to the support member 13 through a threaded structure. The support member 13 is sleeved on the outer periphery of the elastic seal 18, and the elastic seal 18 is connected to the three-way joint 12. A plurality of radially extending through grooves 134 are circumferentially arranged on the side wall of the support member 13, and a slider assembly 17 is slidably arranged in the through groove 134. Among them, the slider assembly 17 includes a plurality of slider units 17a, and the number of the slider units 17a is equal to and one-to-one corresponding to the through groove 134, that is, a corresponding slider unit 17a is slidably arranged in a through groove 134. The slider unit 17a is a square block structure, and its surface away from the support member 13 is a first wedge surface 171, and the height of the first wedge surface 171 gradually increases from the proximal end to the distal end. Of course, the slider unit can also be set to other shapes, such as a cylindrical structure or a structure with a curved surface. The specific structural form of the slider unit is not limited, as long as it has a wedge surface and can slide along the through slide groove 134. The sliding unit 17a is radially slidable in the through slide groove 134 and can abut against the outer periphery of the elastic seal 18, thereby squeezing or releasing the elastic seal 18. The knob 14 can drive the slider assembly 17 to move radially to squeeze or release the elastic seal 18, thereby adjusting the sealing aperture size of the elastic seal 18 and improving the reliability and adaptability of the seal.

[0038] See also Figure 4As shown, the structure of the elastic seal 18 is explained. The elastic seal 18 is a funnel-shaped elastic seal, which is an overall tubular structure. It can be made of a flexible material that can seal gas and liquid at normal temperature and pressure, such as silicone, rubber or other resin materials. The elastic seal 18 has a flange-shaped proximal end 183 and a distal end 182. The proximal end 183 and the distal end 182 are provided to achieve the positioning of the elastic seal 18 or the connection with other components. A protrusion 181 is provided at a substantially middle position of the elastic seal 18 in the axial direction. The protrusion 181 has a certain axial length and radial thickness, which can enhance the structural strength of the elastic seal 18 at this location. See Figure 2 As shown, the slider unit 17a squeezes the elastic seal 18 at the position of the protrusion 181, that is, the squeezing force of the slider unit 17a acts on the protrusion 181. The provision of the protrusion 181 can increase the force-bearing area of ​​the elastic seal 18 and the slider unit 17a, so that the overall force of the elastic seal 18 is more uniform. In addition, the provision of the protrusion 181 enhances the local structural strength of the elastic seal 18, preventing the elastic seal 18 from being damaged due to fatigue failure under the long-term squeezing of the slider unit 17a. In addition, in order to reduce the friction resistance when the instrument passes through the inner cavity of the elastic seal 18 and increase the smoothness, the inside of the elastic seal 18 is smoothed. In this embodiment, a layer of PTFE lining film is applied to the inner wall of the elastic seal 18. Of course, in other embodiments, the protrusion 181 can also be replaced by a groove portion.

[0039] See also Figure 5 As shown, the structure of the support member 13 is described. The support member 13 is a tubular structure with an annular flange 132 as a whole. A first support member unit 131 is arranged on the distal side of the annular flange 132, and a second support member unit 133 is arranged on the proximal side of the annular flange 132. Among them, the first support member unit 131 is a cylindrical structure, and its inner wall is provided with an internal thread; the second support member unit 133 is a prismatic structure with an inner cavity, and its cross-section is a polyhedron or other non-circular structure such as an ellipse. A plurality of radially extending through grooves 134 are arranged on the second support member unit 133 along the circumferential direction. The through groove 134 penetrates the side wall of the second support member unit 133, so that its inner cavity is connected to the outside. The number of the through grooves 134 is at least two (the number is equal to the number of slider units and corresponds one to one), and they are evenly or unevenly distributed along the circumference. The cross-sectional shape of the through-slot 134 matches the shape of the slider unit 17a, so that the slider unit 17a can slide in the through-slot 134 along the radial direction of the support member 13. Figure 5There are 4 through-slots 134 evenly distributed along the circumferential direction, and each through-slot 134 has a rectangular cross-section. A first limiting protrusion 135 and a second limiting protrusion 136 are respectively arranged on the two axial peripheries of the through-slot 134. The first limiting protrusion 135 and the second limiting protrusion 136 extend axially, and the side walls thereof close to the through-slot 134 are flush with the inner wall surface of the through-slot 134, that is, the side walls of the first limiting protrusion 135 and the second limiting protrusion 136 close to the through-slot 134 constitute the inner wall surface of the through-slot 134. In addition, a third limiting protrusion 137 is also arranged on the periphery extending along the circumferential direction of the through-slot 134. The third limiting protrusion 137 extends axially, and its proximal wall surface is flush with the distal side wall surface of the through-slot 134. In addition, the third limiting protrusion 173 can also extend circumferentially and be flush with the periphery of the through-slot 134. In other embodiments, a limiting protrusion flush with the wall surface of the through-slot 134 may also be provided on the axially opposite side of the third limiting protrusion 137. In this embodiment, a limiting protrusion may be provided on part or all of the periphery of the through-slot 134.

[0040] See also Figure 6 As shown, considering that the height of the slider unit 17a is greater than the wall thickness of the support member 13, a limiting protrusion is set around the through-slot 134. The wall thickness of the through-slot 134 can be increased without increasing the overall wall thickness of the support member 13, so that the slider unit 17a can be better limited, ensuring that the slider unit 17a slides radially in the through-slot 134 and preventing it from detaching from the through-slot 134.

[0041] See also Figure 7 As shown, the structure of the knob 14 is described. In this embodiment, the knob 14 is configured as a cap structure with an inner cavity and openings at both ends. A knob internal thread 141 is provided on the inner wall on the proximal side of the knob 14, and a second wedge surface 142 is provided on the inner wall on the distal side of the knob internal thread 141. The second wedge surface 142 can be an annular surface continuously arranged in the circumferential direction, or can be composed of a plurality of arc surfaces arranged discontinuously along the circumferential direction. Among them, the second wedge surface 142 matches the first wedge surface 171 of the slider unit 17a, and its height gradually increases from the proximal end to the distal end, and its taper is equal to or substantially equal to the taper of the first wedge surface 171 of the slider unit 17a. When the knob 14 moves axially toward the distal end, since the height of the second wedge surface 142 gradually decreases, it will radially squeeze the slider unit 17a, thereby pushing the slider unit 17a to move radially and inward, thereby achieving squeezing of the elastic seal 18.

[0042] See also Figure 8As shown, the structure of the threaded fixing sleeve 19 is explained. The threaded fixing sleeve 19 is a sleeve structure with an opening at one end and a bottom wall 193 at the other end. An external thread 191 is provided on the outer periphery of the threaded fixing sleeve 19, and the external thread 191 matches the knob internal thread 141 of the knob 14, so that the knob 14 and the threaded fixing sleeve 19 form a thread pair. The cross-sectional shape of the inner cavity of the threaded fixing sleeve 19 matches the non-circular cross-section of the second support unit 133 of the support member 13, so that the threaded fixing sleeve 19 can be smoothly sleeved on the outer periphery of the second support unit 133. Since the cross-sectional shapes of the threaded fixing sleeve 19 and the second support unit 133 are non-circular structures, the two cannot rotate relative to each other around the central axis. See Figure 3 As shown, the support member 13 is fixedly connected to the three-way joint 12, and the threaded fixing sleeve 19 is fixedly sleeved on the support member 13. Specifically, the threaded fixing sleeve 19 can be sleeved on the support member 13 and after being moved to a predetermined position in the axial direction, the threaded fixing sleeve 19 is fixedly connected to the support member 13. The fixed connection can be achieved by gluing, welding or hot melting. The threaded fixing sleeve 19 fixedly connected to the support member 13 can neither rotate nor move relative to the support member 13. Considering that the fixed connection method can be used to simultaneously limit the axial and circumferential degrees of freedom of the threaded fixing sleeve 19, in other embodiments, the outer circumferential cross-section of the second support member unit 133 and the inner cavity cross-section of the threaded fixing sleeve 19 can also be set to a circular structure.

[0043] See again Figure 2-3 As shown, the connection method of the proximal portion 183 of the elastic seal 18 is described. The proximal side of the elastic seal 18 is connected with the adapter plate 110, the sealing sheet 120 and the fixed threaded sleeve 19 in sequence. Among them, the sealing sheet 120 is an elastic seal with a cross cut in the middle, and its material can be silicone or rubber. The adapter plate 110 is made of a material with a greater hardness than the sealing sheet, and its elastic modulus is greater than the elastic modulus of the sealing sheet 120. The proximal portion 183 of the flange structure extends out of the support 13 and abuts against the proximal surface of the support 13. The proximal side of the proximal portion 183 is connected with the adapter plate 110 and the sealing sheet 120 in sequence, and the fixed threaded sleeve 19 is sleeved on the proximal portion 183, the adapter plate 110 and the outer periphery of the sealing sheet 120, and the above-mentioned components are pressed against the proximal end of the support 13 through its bottom wall 193, thereby realizing the sealed communication between the proximal portion 183 of the elastic seal 18 and the proximal end of the support 13. Therefore, in this embodiment, a double-layer sealing method is adopted, that is, it includes a sealing piece 120 with a cross cut and a funnel-shaped elastic seal 18. The double-layer sealing method is used to enhance the sealing effect, increase the reliability of the sealing, and ensure the life safety of the user to a higher degree.

[0044] See again Figure 2-3As shown, the connection method of the distal end portion 182 of the elastic seal 18 is described. The proximal side of the tee joint 12 has an external thread, and the distal side of the support member 13 has an internal thread. The support member 13 and the tee joint 12 are fixedly connected by threads. The interior of the support member 13 has a step surface 138, and the proximal end of the distal end portion 182 abuts against the step surface 138, and the distal end abuts against the fastening ring 16. The outer periphery of the fastening ring 16 has a step surface (not marked in the figure), and the sealing ring 15 is sleeved on the outer periphery of the fastening ring 16 and abuts against the step surface. See Figure 2 As shown, the sealing ring 15, the fastening ring 16 and the distal end portion 182 are located between the proximal end surface of the tee joint 12 and the step surface 138 of the support member 13. During the threaded connection process between the support member 13 and the tee joint 12, the proximal end surface of the tee joint 12 and the step surface 138 of the support member 13 will approach each other, thereby squeezing the sealing ring 15, the fastening ring 16 and the distal end portion 182 located therebetween, thereby achieving the positioning of the distal end portion 182 and the fixed connection with the end of the tee joint 12. In this embodiment, by sleeve-arranging the sealing ring 15 on the outer periphery of the fastening ring 16, the threaded connection and the connection between the end surface of the tee joint 12 and the fastening ring 16 are sealed, thereby achieving the sealed communication between the distal end portion 182 and the tee joint 12.

[0045] During use, in order to adapt to different sizes of instruments and reduce the inner diameter of the elastic seal 18 to achieve a sealing effect, it is only necessary to hold the three-way connector 12 while turning the knob 14. During the rotation process, the thread on the inner wall of the knob 14 rotates along the thread of the threaded fixing sleeve 193, that is, the knob 10 as a whole will move along the access direction (distal end) of the interventional instrument. During the movement, the inner wall of the knob 10 will squeeze all the slider units 17a at the same time, so that the slider units 17a move in the radial direction toward the central axis of the elastic seal 18. During the movement, the slider units 17 will squeeze the side walls of the elastic seal 18, thereby reducing the inner diameter of the leak, so as to adapt to the interventional instrument passing through the elastic seal 17. Since the present embodiment adopts the method of radial extrusion to reduce the inner diameter, compared with the method of axial extrusion, the elastic seal 18 will not generate friction in the axial direction on the interventional instrument during the radial deformation process, thereby avoiding damage to the interventional instrument during the deformation of the silicone.

[0046] Second embodiment

[0047] The catheter sheath structure in this embodiment is basically the same as that in the first embodiment, and the similarities between the two are not repeated here. Different from the first embodiment, a different driving mechanism is used in this embodiment to drive the slider assembly to move radially. Specifically, unlike the first embodiment which uses a wedge block to drive, a gear-rack mechanism is used in this embodiment to drive the slider assembly.

[0048] See also Fig. 9 As shown, the catheter sheath 20 in this embodiment includes a three-way connector 23, a three-way valve assembly 24 (including a hose and a three-way valve) is arranged on its outer periphery, and its end is connected with the sheath tube 21 through an intermediate connector 22, and a knob 27 is arranged at the proximal end of the three-way connector 23.

[0049] See also Figure 10-11 As shown, the structure of the catheter sheath 20 is further described. The proximal side of the three-way connector 23 is threadedly connected with a support member 26, and the inner cavity of the support member 26 is provided with an elastic sealing member 210, that is, the support member 26 is sleeved on the outer periphery of the elastic sealing member 210. Fig.11 As shown, the proximal side of the support member 26 is rotatably connected with a gear assembly 28 and slidably connected with a slider assembly 29. A knob 27 is also rotatably connected to the outer periphery of the support member 26, and the knob 27 is sleeved on the outer side of the support member 26 and the gear assembly 28. The gear assembly 28 can be driven to rotate by rotating the knob 27 around the axial direction, and the rotation of the gear assembly 28 can drive the slider assembly 29 to slide relative to the support member 26 in the radial direction, thereby squeezing the elastic seal 210 arranged inside the support member 26. For the convenience of assembly, the knob 27 is divided into two parts, an upper knob 27a and a lower knob 27b, which are buckled to form a cylindrical knob 27. The proximal end of the elastic seal 210 is connected to the proximal side of the knob 27, and the distal end is connected to the three-way joint 23. A groove portion 211 is provided at approximately the middle position of the elastic seal 210 along the axial direction. The groove portion 211 in this embodiment is an annular groove seal arranged circumferentially around the elastic seal 210. The groove portion can also be arranged as an arc-shaped groove distributed and arranged at intervals along the circumference of the elastic seal 210. The slider assembly 29 squeezes the elastic seal 210 at the position of the groove portion 211. The setting of the groove portion 211 can position the slider assembly 29, that is, the slider assembly 29 squeezes the elastic seal 210 along the groove portion 211 in the radial direction. In other embodiments, the groove portion can also be replaced by a protrusion, and the groove portion and the protrusion can also exist at the same time. In addition, see Fig.10 As shown, a sealing ring 25 is also connected to the proximal side of the elastic sealing member 210. Similar to the first embodiment, the sealing ring 25 can be combined with the elastic sealing member to form a double sealing structure to improve the reliability of the sealing and enhance the sealing effect.

[0050] See also Fig.12As shown, the structure of the slider unit 29a constituting the slider assembly 29 is described. Different from the wedge-shaped structure of the side of the slider unit in the first embodiment, one side of the slider unit 29a in this embodiment has a transmission tooth 292, so that the slider unit 29a is configured as a rack structure. In addition, a slider stopper 291 is also provided on the side of the slider unit 29a opposite to the transmission tooth 292. Exemplarily, the slider stopper 291 is a protruding structure provided on the side of the transmission tooth. In other embodiments, the slider stopper 291 can also be provided as a groove structure.

[0051] See also Fig.13 As shown, the gear assembly 28 includes a plurality of gear units 28a, and the number of the gear units 28a is the same as the number of the slider units 29a and corresponds one to one, that is, one gear unit 28a cooperates with one slider unit 29a. The gear unit 28a meshes with the transmission teeth 292 of the slider unit 29a, thereby forming a gear and rack transmission pair. The side wall of the slider unit 29a facing the center can abut against the outer periphery of the elastic seal 210. The inner wall of the knob 27 is provided with an inner transmission tooth 271 that meshes with each gear unit 28a at the same time, so that the knob 27 and the gear unit 28a form a gear transmission pair, and the gear units 28a can be driven to rotate in the same direction at the same time by rotating the knob 27. Exemplarily, when the knob 27 rotates in the counterclockwise direction C around the axis, the gear unit 28a can be driven to rotate in the counterclockwise direction C to push all the slider units 29a to slide radially toward the elastic seal 210 at the same time, so that the slider units 29a distributed circumferentially along the elastic seal 210 squeeze the elastic seal 210 at the same time, thereby adjusting the inner diameter of the elastic seal 210 and adjusting its sealing size to adapt to instruments of different sizes.

[0052] See also Fig.14 As shown, the structure of the support member 26 in this embodiment is described. The support member 26 is a cylindrical structure with an inner cavity as a whole, and a through slide groove 261 is provided on its proximal side. Specifically, the through slide groove includes a first through slide groove unit 261a, which is formed by a portion of the proximal surface of the support member 26 being recessed toward the distal end, and a slide groove limiting portion 261b is also provided on the side wall of the first through slide groove unit 261a. For example, see Fig.14 As shown, the slide groove limiting portion 261b is set as a second through slide groove unit, that is, it is set as a groove structure. At this time, the through slide groove 261 includes a first through slide groove unit 261a and a second through slide groove unit that are interconnected. The first through slide groove unit 261a and the second through slide groove unit are set at a certain angle to each other ( Fig.14The first through-slot 261a and the second through-slot unit have the same radial dimensions and extend from the outer wall of the support member 26 to the inner wall thereof, thereby forming a through-slot that connects the inner cavity of the support member 26 with the outside in the radial direction. The first through-slot 261a is formed by the proximal end surface of the support member 26 being recessed along the distal end surface, while the second through-slot is formed by the side wall of the first through-slot 261a being recessed along the circumferential direction. The second through-slot unit can be arranged at the bottom of the first through-slot 261a, thereby forming an L-shaped slot, see Fig.14 As shown; in other embodiments, the second through-slot unit can be arranged at the middle attachment position of the first through-slot 261a along the axial direction, thereby forming a T-shaped slot; in addition, the second through-slot unit can be arranged on opposite sides of the first through-slot 261a in the circumferential direction. In other embodiments, the second through-slot can also be replaced with a convex structure. In addition, a connecting member 262 is also arranged on the proximal surface of the support member 26 and near the through-slot 261, and the connecting member 262 is used to realize the rotation connection with the gear unit 28a.

[0053] See also Fig.11 , 14 As shown, when the slider unit 29a slides radially in the through-slot 261, the slot limiting portion 261b cooperates with the slider limiting portion 291 of the slider unit 29a to limit the slider unit 29a in the axial direction, preventing the slider unit 29a from detaching from the through-slot 261 during the sliding process.

[0054] During use, when the inner diameter of the elastic seal 210 needs to be reduced to achieve a sealing effect in order to adapt to instruments of different sizes, it is only necessary to hold the three-way connector 23 while turning the knob 27. During the rotation, the knob 27 drives the gear assembly 28 to rotate, and the gear assembly 28 drives the slider assembly to move toward the central axis of the elastic seal 210. During the movement, the slider unit 17 squeezes the side wall of the elastic seal 18, thereby reducing the inner diameter of the elastic seal 18, so as to adapt to the interventional instrument passing through the elastic seal 17 and achieve a better sealing effect.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. The protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A catheter sheath, characterized in that: include: Tee connector; A sheath tube connected to the three-way connector; an elastic sealing member, the distal end of which is connected to the three-way joint; A support member, which is sleeved on the outer periphery of the elastic sealing member and whose distal end is fixedly connected to the proximal end of the three-way joint, and the support member is provided with a plurality of radially extending through sliding grooves along the circumferential direction; A plurality of slider units, wherein the plurality of slider units correspond to the plurality of through-slots one by one and are slidably disposed in the corresponding through-slots; The knob is rotatably sleeved on the support member to drive the slider unit to move radially to squeeze or release the elastic sealing member.

2. A catheter sheath according to claim 1, characterized in that: The slider unit is provided with a first wedge-shaped surface; the inner wall of the knob is provided with a second wedge-shaped surface matching with the first wedge-shaped surface.

3. A catheter sheath according to claim 2, characterized in that: It also includes a threaded fixing sleeve, which is fixedly sleeved on the proximal side of the support member, and the inner wall of the knob is provided with a knob internal thread that is threadably matched with the threaded fixing sleeve.

4. A catheter sheath according to claim 3, characterized in that: The proximal side of the threaded fixing sleeve has a bottom wall, and the proximal end of the elastic sealing member has a proximal end portion, and the bottom wall can press the proximal end portion against the proximal surface of the supporting member.

5. The catheter sheath according to claim 1, characterized in that: A limiting protrusion is arranged on the periphery of at least one side of the through-sliding groove, and the limiting protrusion is flush with the inner wall surface of the through-sliding groove.

6. A catheter sheath according to claim 1, characterized in that: The slider unit is also provided with transmission teeth, and the proximal side of the support is rotatably connected with a plurality of gear units corresponding to the slider unit one by one, and each of the gear units is meshed with the transmission teeth; the interior of the knob is provided with internal transmission teeth, and the internal transmission teeth are meshed with the gear units.

7. A catheter sheath according to claim 6, characterized in that: The through slide groove includes a first through slide groove unit, which is formed by a portion of the proximal surface of the support member being recessed toward the distal end. A slide groove limiting portion is also provided on the side wall of the first through slide groove unit, and a slider limiting portion cooperating with the slide groove limiting portion is also provided on the outer periphery of the slider unit.

8. The catheter sheath according to any one of claims 1 to 7, characterized in that: A sealing sheet is also included, and the sealing sheet is arranged on the proximal side or the distal side of the elastic sealing member.

9. The catheter sheath according to any one of claims 1 to 7, characterized in that: A convex portion or a concave portion is provided on the outer periphery of the elastic seal, and the slider unit abuts against the convex portion or the concave portion.

10. The catheter sheath according to any one of claims 1 to 7, characterized in that: A PTFE film is arranged inside the elastic sealing member.

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