Vascular sheath

Abstract

The invention relates to a vascular sheath, comprising: a three-way connector; the sheathing canal extends along the longitudinal axis and is communicated with the three-way connector; the far end of the supporting piece is connected with the near end of the three-way connector; the elastic sealing piece is arranged in the inner cavity of the supporting piece, and the far end of the elastic sealing piece is communicated with the three-way connector; the driving piece is rotationally connected to the supporting piece or movably arranged on the outer side of the supporting piece; the binding rope is wound on the periphery of the elastic sealing piece, and the two free ends of the binding rope penetrate out of the inner cavity of the supporting piece. The blood vessel sheath is high in operation efficiency, convenient and fast to operate and good in sealing adaptability.

Description

Technical Field

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

[0002] In vascular interventional treatment, the first step is to establish and maintain vascular access. Among them, vascular sheaths are used to assist various interventional catheters to enter vascular arteries or veins during percutaneous puncture and cannulation, reduce blood loss and provide a stable surgical channel.

[0003] When the vascular sheath is used to introduce a large stent or other device, a large-sized catheter (such as 8mm) and a small-sized guidewire (such as 0.9mm) need to be introduced during the operation. The vascular sheath needs to be able to simultaneously meet the sealing performance and passability of the small-sized guidewire and the large-sized catheter. Therefore, the vascular sheath is required to be able to adaptively adjust the size of the sealing channel according to actual requirements. However, the existing methods for adjusting the size of the sealing channel are difficult to operate or inefficient. Summary of the invention

[0004] Based on this, it is necessary to provide a vascular sheath to address the above-mentioned problems, comprising: a three-way connector; a sheath tube extending along the longitudinal axis and connected to the three-way connector; a support member, the distal end of which is connected to the proximal end of the three-way connector; an elastic sealing member arranged in the inner cavity of the support member and the distal end of which is connected to the three-way connector; a driving member, the driving member being rotatably connected to the support member, or movably arranged on the outside of the support member; a binding rope wound around the outer periphery of the elastic sealing member, with its two free ends passing through the inner cavity of the support member, and when the driving member rotates, the binding rope can be wound around the driving member, so that the binding rope can circumferentially bind the elastic sealing member, or the two free ends of the binding rope are fixedly connected to the driving member, and when the driving member is pulled, the binding rope can circumferentially bind the elastic sealing member.

[0005] Optionally, a support rod is provided on the support member, the driving member includes a knob, a knob protrusion is provided in the knob, the support rod is rotatably inserted in the knob protrusion, and the restraining rope can be wound around the outer periphery of the knob protrusion.

[0006] Optionally, a damping ring is further included, and the damping ring is interference-fitted in an annular space formed by the outer wall of the support rod and the inner wall of the knob protrusion.

[0007] Optionally, an annular protrusion is provided on the outer periphery of the support rod, and a step surface is provided at the free end of the knob protrusion; and the damping ring is provided between the annular protrusion and the step surface.

[0008] Optionally, the two free ends of the restraining rope are fixed on the outer periphery of the knob protrusion.

[0009] Optionally, the support rod has a first separation groove that is radially penetrated, and the two free ends of the restraining rope are connected and hooked in the first separation groove; the knob has a second separation groove that is radially penetrated, the first separation groove and the second separation groove are aligned, the restraining rope can pass through the second separation groove and at least a portion of it is exposed at the two ends of the second separation groove.

[0010] Optionally, the driving member also includes a winding wheel sleeved on the outer circumference of the support rod, the winding wheel has a radial through groove, and the two free ends of the restraining rope are connected and hooked in the radial through groove; the knob is provided with a knob protrusion that is engaged with the radial through groove.

[0011] Optionally, at least one damping ring is interference-disposed in an annular space formed by the outer periphery of the support rod and the inner wall of the winding wheel.

[0012] Optionally, the support member is also provided with a slide groove and two through holes, and the two through holes radially penetrate the inner and outer sides of the support member and pass through the slide groove; it also includes a button that can be slidably fitted in the slide groove, and the button is provided with two button through holes that can be aligned one by one with the two through holes respectively, and the two free ends of the restraining rope pass through the through holes and the button through holes and are fixedly connected to the driving member.

[0013] Optionally, the inner wall of the slide groove has a limiting slide groove or a limiting protrusion, and the button is provided with a limiting protrusion or a limiting slide groove that cooperates with the limiting slide groove or the limiting protrusion.

[0014] Optionally, it further comprises an elastic member arranged in the slide groove, one end of the elastic member abuts against the bottom wall of the slide groove, and the other end abuts against the distal end side of the button.

[0015] Optionally, the support member is provided with rope guide members located on both sides in the lateral direction, and the two free ends of the restraining rope pass through the rope guide members respectively.

[0016] Optionally, a groove portion is provided on the outer periphery of the elastic sealing member, and the tethering rope is wound in the groove portion.

[0017] Optionally, the inner wall of the elastic sealing member is provided with a plurality of petal-shaped protrusions along the circumferential direction.

[0018] The technical solution of the present invention has the following beneficial effects:

[0019] The present invention uses a knob to pull the binding rope to tighten or loosen the elastic seal, which can adjust the inner diameter of the elastic seal, realize the adjustment of the size of the sealing channel, and adaptively adjust the sealing inner diameter of the elastic seal, so as to achieve a good sealing effect. In addition, by winding the binding rope with a knob or directly pulling the binding rope, the adjustment efficiency is high, and the elastic seal can be tightened and loosened by rotating the knob in a small range or directly pulling the binding rope. The operation is convenient, which greatly reduces the difficulty and time of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall appearance structure of the vascular sheath in the first embodiment;

[0021] Figure 2 is an exploded structural diagram of the vascular sheath in the first embodiment;

[0022] Figure 3 is a cross-sectional view of the vascular sheath in the first embodiment;

[0023] Figure 4 is a structural diagram of the elastic sealing member in the first embodiment;

[0024] Figure 5a It is a structural diagram of the lower support member in the first embodiment;

[0025] Figure 5b is a structural diagram of the upper support member in the first embodiment;

[0026] Figure 6 is a structural diagram of the knob in the first embodiment;

[0027] Figure 7 It is a schematic diagram of the assembly of the knob and the upper support member in the first embodiment;

[0028] Figure 8 is another schematic diagram of assembling the knob and the upper support member in the first embodiment;

[0029] Fig. 9 A structural diagram showing a first embodiment in which the elastic sealing member is restrained;

[0030] Fig.10 is an exploded structural diagram of a vascular sheath in the second embodiment;

[0031] Fig.11 is a cross-sectional view of a vascular sheath in a second embodiment;

[0032] Fig.12 is a structural diagram of a winding wheel in a second embodiment;

[0033] Fig.13 is a structural diagram of a knob in the second embodiment;

[0034] Fig.14 is an assembly diagram of the binding wire and the winding wheel in the second embodiment;

[0035] Fig.15 is a structural diagram of the appearance of a vascular sheath in the third embodiment;

[0036] Fig.16 is a cross-sectional view of a vascular sheath in a third embodiment;

[0037] Fig.17 is a diagram of the exploded structure of the vascular sheath in the third embodiment;

[0038] Fig.18 is a structural diagram of an upper support member in a third embodiment;

[0039] Fig.19 is a button structure diagram in the third embodiment;

[0040] Fig. 20 for Fig.16 A in the enlarged view; DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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" refers to the direction perpendicular to the axial direction.

[0045] First embodiment

[0046] See also Figure 1 As shown, this embodiment provides a vascular sheath 10 for establishing a safe access channel for other interventional instruments to enter human blood vessels, including a three-way connector 13, and a three-way valve assembly 130 (including a hose 130a connected to the three-way connector 13 and a three-way valve 130b connected to the end of the hose 130a) is arranged on the periphery of the three-way connector 13. The distal end of the three-way connector 13 can be connected to the proximal end of the sheath tube 11 extending along the longitudinal axis through the intermediate member 12, and the proximal end is fixedly connected to a support member 16, and a driving member 19 is also rotatably sleeved on the periphery of the support member 16. In this embodiment, the driving member 19 includes a knob.

[0047] See also Figure 2-3 As shown, the overall structure of the vascular sheath 10 is further described. The catheter sheath 10 has a three-way connector 13, the distal end of the three-way connector 12 is connected to the sheath tube 11 through the intermediate connector 12, and the proximal end is fixedly connected to the main support member 16 through a threaded structure. The support member 16 is sleeved on the outer periphery of the elastic seal 14, and the elastic seal 14 is connected to the three-way connector 12. A sealing ring 17 is also provided on the distal side and / or the proximal side of the elastic seal 14. The sealing ring 17 cooperates with the elastic seal 14 to achieve a double sealing effect and enhance the sealing performance of the vascular sheath 10. The binding rope 15 is wound around the outer periphery of the elastic seal 14. By tightening or releasing the binding rope 15, the elastic seal 14 can be tightened or loosened, and its inner diameter size can be adjusted, thereby changing the size of the sealing channel to adapt to the sealing after instruments of different sizes pass through. In order to facilitate the movement of the restraint rope 14, in this embodiment, the support member 16 is set as a split lower support member 16a and an upper support member 16b, which can be assembled together through a snap-fit ​​structure to form the support member 16. Among them, after the restraint rope 15 is wound around the outer periphery of the elastic sealing member 14, its two ends pass through the rope guide members 161 set on both sides of the lower support member 16a, extend upward through the upper support member 16a and expose to the upper support member 16a. At this time, the two ends of the restraint rope 15 can be connected and hooked on the support rod 166 of the upper support member 16a. See Figure 3As shown, the driving member 19 is rotatably sleeved on the support rod 166, and the two ends of the restraining rope 15 can be connected and wrapped around the driving member 19. By rotating the driving member 19, the length of the restraining rope 14 wound around the outer periphery of the elastic sealing member 14 can be adjusted to tighten or loosen the elastic sealing member 14, thereby adjusting the sealing aperture size of the elastic sealing member 14 and improving the reliability and adaptability of the seal.

[0048] See also Figure 4 As shown, the structure of the elastic seal 14 is described. The elastic seal 14 is a funnel-shaped elastic seal with an overall tubular structure, which 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 14 has a proximal connection part 141 and a distal connection part 142 in the shape of a flange. The proximal connection part 141 and the distal connection part 142 are provided to achieve the positioning of the elastic seal 14 or the connection with other components. A card groove part 143 is provided on the outer periphery of the elastic seal 14 at a roughly middle position in the axial direction. The card groove part 143 in this embodiment is a groove structure arranged in a circumferential annular direction around the elastic seal 14. In addition, in order to reduce the friction resistance when the instrument passes through the inner cavity of the elastic seal 14 and increase the smoothness, the inside of the elastic seal 14 is smoothed, for example, in this embodiment, a layer of PTFE lining film is applied to the inner wall of the elastic seal 14. In addition, a plurality of petal-shaped protrusions 144 are arranged on the inner wall of the elastic seal 14 along the circumferential direction. In this embodiment, the petal-shaped protrusions 144 are arranged to be 5 and evenly distributed along the circumference. The petal-shaped protrusions 144 are arranged on the inner wall of the elastic seal, so that the elastic seal 14 can be folded along the petal-shaped protrusions and compressed inward during the tightening process of the binding rope 15, and finally form a uniform petal-shaped seal. Therefore, the arrangement of the petal-shaped protrusions 144 can improve the sealing performance and service life of the elastic seal 14, and avoid poor sealing and fatigue damage of the elastic seal 14 due to excessive local deformation caused by local uneven deformation.

[0049] See also Figure 5a-5b As shown, the structure of the support member 16 is explained. The support member 16 as a whole is a tubular structure with an inner cavity, and the elastic seal 14 is arranged in its inner cavity. Since the restraining line 15 is wound on the elastic seal 14 arranged in the inner cavity of the support member 16, in order to facilitate the lead-out of the two free ends (rope head / rope tail) of the restraining line 15, the support member 16 is configured to include an upper support member 16b and a lower support member 16a in the form of a split structure. Exemplarily but not restrictively, the tubular structure support member 13 can be radially cut to form an open groove with a certain axial length and then the two can be separated to divide the support member into an upper support member 16b and a lower support member 16a.

[0050] See also Figure 5aAs shown, for the lower support member 16a, it has an open groove 162, and the open groove 162 connects the inner cavity of the support member 16 with the outside. On both sides of the open groove 162, that is, on the bottom wall on both sides of the open groove 162, a guide rope member 161 with a guide rope member through hole 161a is fixed or integrally arranged. After the restraining rope 15 is wound around the elastic seal 14, its two free ends pass through the guide rope members 161 on both sides from the guide rope member through hole 161a, so that the two free ends of the restraining rope 15 are routed separately from both sides of the support member 16. Therefore, the setting of the guide rope member 161 can guide the routing path of the restraining rope 15, so that the remaining part of the restraining rope 15 that is not wound around the elastic seal 14 is guided by the guide rope member 161 and is located on both sides of the open groove 162 after being limited, thereby avoiding the entanglement of the restraining rope 15 and reducing the possibility of its failure. In addition, since the binding rope 15 passes through the rope guide 161 and continues to run upward, the binding rope 15 is bent at the rope guide 161. Since the pulling force (tension) acting on the binding rope 15 is along the extension direction of the binding rope 15, the tension direction of the binding rope 15 will change at the rope guide 161, and the angle of the binding rope 15 relative to the horizontal plane will decrease after the binding rope 15 passes through the rope guide 161. On the one hand, the reduction of the angle increases the horizontal binding force of the binding rope 15 on the elastic seal 14, so that the binding rope 15 can more easily tighten or loosen the elastic seal 14, making the operation process more labor-saving and convenient for the operator; on the other hand, the reduction of the angle reduces the vertical component of the binding rope 15 acting on the elastic seal 14, and reduces the degree to which the elastic seal 14 is bent upward as a whole due to the vertical component of the force.

[0051] See also Figure 5b As shown, the upper support member 16b is in an arc-shaped block shape as a whole, and after cooperating with the open groove 162 of the lower support member 16a, the open groove 162 can be closed to form a complete tubular structure. The upper support member 16b as a whole includes an arc-shaped block body 163 and an annular flange 164 arranged on the outer side of the top of the body 163. On the bottom wall inside the annular flange 164, a support rod 166 is fixedly arranged. The support rod 166 is in a cylindrical or conical shape as a whole, and a first separation groove 167 is provided thereon, which is radially penetrated and has a certain depth in the axial direction. The provision of the first separation groove 167 can separate the support rod 166 into two support rod units 166a and 166b located on opposite sides. In addition, on the inner bottom wall of the annular flange 164 and located on both sides of the support rod 166, through holes 165 corresponding to the guide rope members 161 located on both sides are also provided. Each through hole 165 and its corresponding rope guide 161 are located on the same side, so that the two free ends of the restraining rope 15 can continue to pass through the through hole 165 upward after passing through the rope guide 161, so as to reach the outside of the support member 16. In addition, an annular protrusion 168 is provided around the outer circumference of the support rod 166 near or at the bottom of the support rod 166.

[0052] See also Figure 6 As shown, the structure of the driving member 19 is described. In this embodiment, the driving member 19 is configured as a cap structure with an opening at one end and a closed end at the other end, that is, it is configured as a knob structure. Specifically, the driving member 19 includes a knob body 191 and a knob protrusion 192 arranged inside the knob body 191. Among them, the knob body 191 has a bottom wall 1911, one end of the knob protrusion 192 is fixed or integrally connected to the bottom wall 1911, and the other end extends along the axial direction of the knob body 191 toward the open end. The knob protrusion 192 has an inner cavity hole 1921 connected to the open end, and a step surface 1922 is provided on the free end side of the inner cavity hole 1921. A rope winding groove 1923 is arranged around the outer periphery of the knob protrusion 192. The rope winding groove 1923 is used to accommodate the binding rope 15, and the binding rope 15 will be accommodated in the rope winding groove 1923 when it is wrapped around the outer periphery of the knob protrusion 192, so as to limit the binding rope 15. In addition, the knob protrusion 192 is radially penetrated by two separation grooves 1924 having a certain axial depth and corresponding to the first separation groove 167. The second separation groove 1924 radially connects the inner cavity of the knob protrusion 192 with the outside, and divides the knob protrusion 192 into two relatively separated knob protrusion units.

[0053] See again Figure 3 As shown, a damping ring 18 is sleeved on the support rod 166 on the upper support member 16b, and an annular protrusion 168 arranged around the support rod 166 limits the position of the damping ring 18. When the driving member 19 is sleeved on the upper support member 16b, the support rod 166 arranged on the upper support member 16b is inserted into the inner cavity hole 1921 along the opening direction of the driving member 19. At this time, the damping ring 18 is limited in the cavity formed by the annular protrusion 168, the step surface 1922, the outer wall of the support rod 166, and the inner wall of the knob protrusion 192. The annular protrusion 168 and the step surface 1922 are used to axially squeeze and axially limit the damping ring 18. In addition, the damping ring 18 is interference-fitted in the annular space formed by the outer wall of the support rod 166 and the inner wall of the knob protrusion 192, that is, the damping ring 18 is simultaneously in contact with the outer wall of the support rod 166 and the inner wall of the knob protrusion 192. The damping effect of the damping ring 18 can realize the self-locking of the driving member 19, that is, when the driving member 19 is rotated to a certain angle, the driving member 19 will not spin without external force, and can remain at a predetermined position without rotating. In addition, due to the damping effect of the damping ring 18, the operator needs to overcome the damping force to rotate the driving member, which can make the operator have a better operating feel for more stable operation.

[0054] See also Figure 7-8 As shown, the operation method of the vascular sheath 10 in this embodiment is described. Figure 7As shown, the two ends of the restraining rope 15 pass through the inner cavity of the support member 16 and are exposed outside the support member 16, and then the two free ends are fixedly connected and hooked on the support rod 166. At this time, the restraining rope 15 passes through the support rod 166 along the first separation groove 167. Fig. 9 As shown, after aligning the first separation groove 167 with the second separation groove 1924, the driving member 19 is sleeved on the support rod 166. During the sleeve process, the knob protrusion 192 will slowly approach the binding rope 15 until the binding rope 15 enters the second separation groove 1924, and at this time, the binding rope 15 passes through the first separation groove 167 and the second separation groove 1924 at the same time. For the second separation groove 1924, the binding rope 15 extends from the outer wall of one side of the knob protrusion 192 along the second separation groove 1924 through the knob protrusion 192 and reaches the outer wall of the other side of the knob protrusion 192. The binding rope 15 has at least a portion of the two ends exposed in the second separation groove 1924 to ensure that the binding rope 15 can be smoothly wound around the knob protrusion 192 when the driving member 19 is rotated. When the driving member 19 is rotated, the binding rope 15 is wound around the knob protrusion 192, so that the driving member 19 can wind the binding rope 15.

[0055] See also Fig. 9 As shown, as the driving member 19 rotates around the first direction (clockwise or counterclockwise), the length of the restraining rope wrapped around the knob protrusion 192 increases, while the length of the restraining rope wrapped around the outer periphery of the elastic seal 14 decreases, and the restraining force acting on the elastic seal 14 gradually increases. Under the restraining force of the restraining rope, the inner diameter of the elastic seal 14 gradually decreases until its inner cavity is completely closed, so that the restraining rope can circumferentially restrain the elastic seal 14. On the contrary, when the driving member 19 rotates around the second direction (opposite to the first direction), the length of the restraining rope wrapped around the knob protrusion 192 decreases, while the length of the restraining rope wrapped around the outer periphery of the elastic seal 14 increases, and the restraining force acting on the elastic seal 14 gradually decreases. Under the action of its own elastic restoring force, the inner diameter of the elastic seal 14 gradually increases until its inner cavity is fully expanded.

[0056] In other embodiments, the two free ends of the restraining rope 15 may be directly fixed to the outer circumference of the knob protrusion 192 of the driving member 19 , so that the restraining rope 15 can be wound by rotating the driving member 19 .

[0057] Second embodiment

[0058] The vascular sheath structure in this embodiment is substantially the same as that in the first embodiment, and the similarities between the two are not described here. Different from the first embodiment, the binding rope and the driving member in this embodiment adopt different winding methods.

[0059] See also Figure 10-11As shown, in this embodiment, the vascular sheath 20 includes a three-way connector 23, one end of the three-way connector 23 is connected to the sheath tube 21 through an intermediate connector 22, and the other end is threadedly fixedly connected to the support member 26. The elastic seal 24 is arranged in the inner cavity of the support member 26, and the binding line 25 is wound around the outer periphery of the elastic seal 24, and the knob 29 is rotatably connected to the support member 26. The proximal side and / or the distal side of the elastic seal 24 are connected with a sealing ring 27. The support member 26 includes an upper support member 26b and a lower support member 26a, and a support rod 261 is arranged on the upper support member 26b. Different from the first embodiment, the vascular sheath 20 in this embodiment is also provided with a winding wheel 210. The knob 29 and the winding wheel 210 constitute a driving member 29a. The winding wheel 210 is sleeved on the outer side of the support rod 261, and the binding rope 25 is wound on the winding wheel 210. The knob 29 is fixedly connected to the winding wheel 210, and the winding wheel 210 is driven to rotate by turning the knob 29, thereby winding the binding line 25. In addition, at least one damping ring 28 is interference-fitted in the annular space formed by the inner wall of the winding wheel 210 and the outer wall of the support rod 261. The damping ring 28 is provided to provide a damping force when the winding wheel 210 rotates around the support rod 261.

[0060] See also Fig.12 As shown, the structure of the winding wheel 210 is described. The winding wheel 210 is a columnar structure with an inner cavity, which has an upper flange 211 and a lower flange 212. The upper flange 211 and the lower flange 212 are flange-like structures arranged at the ends of the winding wheel 210, which together with the outer wall of the winding wheel 210 form a winding groove 213. In other embodiments, the upper and lower flange structures may not be provided, and the winding groove may be directly provided along the circumferential direction on the outer wall of the winding wheel 210. The winding wheel 210 is provided with a radial through groove 214 having an end extending axially to a certain depth (less than the axial length of the winding wheel). The radial through groove 214 connects the inner cavity of the winding wheel 210 with the radial outer side.

[0061] See also Fig.13 As shown, the structure of the knob 29 is described. The knob 29 in this embodiment is a cap structure with an opening at one end and a bottom wall 291 at the other end. The bottom wall 291 is provided with a knob protrusion 292 that can be snap-fitted with the radial through groove 214. Fig.11 As shown, the knob 29 can be sleeved on the outer side of the winding wheel 220, and the knob protrusion 292 can be snapped into the radial through groove 214 to achieve a fixed connection with the winding wheel 220.

[0062] See also Fig.14As shown, the winding method of the restraint rope 25 is described. In this embodiment, after the restraint rope 25 is wound around the elastic seal 24, its two ends pass through the inner cavity of the support member 26 and are exposed outside the support member 26. At this time, the two ends of the restraint rope 25 are connected and hooked in the radial through groove 214 of the winding wheel 210. In this way, when the knob 29 drives the winding wheel 210 to rotate, the restraint rope 25 is wound around the outer periphery of the winding wheel 210, thereby realizing the winding of the restraint rope 25.

[0063] Third embodiment

[0064] The vascular sheath structure in this embodiment is substantially the same as that in the first embodiment, and the similarities between the two are not described here. Different from the first embodiment, this embodiment adopts a different structure for changing the binding force of the binding rope on the elastic sealing member.

[0065] See also Fig.15 As shown, in this embodiment, the driving member includes a pull block structure. Specifically, the vascular sheath 30 includes a three-way connector 33, one end of which is connected to the sheath tube 31 through an intermediate connector 32, and the other side is threadedly fixedly connected to the support member 36. The elastic seal 34 is arranged in the inner cavity of the support member 36, and the binding line 35 is wound on the outer periphery of the elastic seal 34. A button 38 is slidably arranged in the support member 36, and after the binding rope 35 passes through the inner cavity of the support member 36, its two ends are fixedly connected to the driving member 39. In this embodiment, the length of the binding rope 35 wrapped around the outer periphery of the elastic seal 34 is changed by pulling the driving member 39, and the button 38 is used to lock the binding rope 35. When the button 38 is in a locked state, the length of the binding rope 35 wrapped around the outer periphery of the elastic seal 34 remains unchanged. When the button 38 is pressed to make it in an unlocked state, the degree of tightening of the binding rope 35 on the elastic seal 34 can be changed by pulling the driving member 39 toward the proximal side or releasing the driving member 39 toward the distal side.

[0066] See also Figure 16-17 As shown, a button 38 is slidably provided on the upper support member 36b, and the restraining rope 35 passes through the inner wall of the upper support member 36b and is fixedly connected to the driving member 39 provided on the outer side of the upper support member 36b. In addition, in this embodiment, a sealing ring 310 is connected to the proximal side or the distal side of the elastic sealing member 34. A sealing member fixing member 320 is threadedly connected to the proximal side of the support member 36, which abuts against the sealing ring 310 to axially limit the sealing ring 310 and prevent it from detaching from the support member 36.

[0067] See also Fig.18As shown, the structure of the upper support member 36b is described. A slide groove 362 extending in the axial direction is provided on the outer side of the top of the upper support member 36b, and a guide protrusion 363 extending in the axial direction is provided on the bottom wall of the slide groove 362 at the far side (opposite to the opening side). In addition, a limited slide groove 364 is provided on the upper bottom wall of the slide groove 362. The limited slide groove 364 can be a through groove or a non-through groove, and it has a certain length extending in the axial direction, and its length depends on the stroke size of the button 38. In addition, similar to the first embodiment, the present embodiment is provided with through holes 361 extending in the radial direction on both sides. The through holes 361 on both sides extend from the inner side of the support member 36 to the outer side, pass through the slide groove 362, and continue to extend outward until the support member 36 is penetrated. The two ends of the restraining rope 35 can extend from the inner side of the support member 36 to the slide groove 362 along the through holes 361 on both sides, and then continue to extend outward to the outer side of the upper support member 36b.

[0068] See also Fig.19 As shown, the structure of the button 39 is described. The button 39 is a block structure that can slide in the slide groove 362, and is provided with button through holes 391 that penetrate the upper and lower end surfaces and are located on both sides of the button 39. The two button through holes 391 correspond to the through holes 361 located on both sides. When the button 39 slides in the slide groove 362, the two button through holes 39 can be aligned with the through holes 361 on both sides respectively. In addition, a mounting hole 393 is provided on the far side of the button 39, and a limiting protrusion 392 is provided on the upper end surface of the button 39.

[0069] See also Fig. 20As shown, after the binding rope 35 is wound on the elastic sealing member 34, its two ends respectively pass through the through hole 361 and enter the slide groove 362, and then pass through the button through hole 391 and continue to pass through the through hole 361 upwards to be exposed outside the upper support member 36 and fixedly connected with the driving member 39. The elastic member 37 is arranged in the slide groove 362, one end of which abuts against the upper support member 36b, and the other end abuts against the button 38. Among them, the guide protrusion 363 extends into the elastic member 37, and the other end of the elastic member 37 extends into the mounting hole 393 of the button. The setting of the guide protrusion 363 and the mounting hole 393 is to limit the two ends of the elastic member 37, so as to ensure that the elastic member 37 is compressed or extended along its axial direction during the action process. In addition, the limiting protrusion 392 slides in the limiting slide groove 364. When the button 38 slides to the end of the stroke toward the proximal end under the elastic restoring force of the elastic member 37, the limiting protrusion 392 can abut against the proximal end wall of the limiting slide groove 364, thereby limiting the button 38 and preventing it from falling out of the slide groove 362. In other embodiments, the limiting protrusion and the limiting slide groove can be interchangeable, that is, the limiting protrusion is set on the upper support member and the limiting groove is set on the button. In this embodiment, in order to facilitate the assembly of the button 38, the limiting protrusion 392 is set to a protrusion with a conical surface, and the height of the conical surface gradually increases from the distal end to the proximal end.

[0070] The principle of the vascular sheath of this embodiment is described below. After assembly, the binding rope 35 will pass through the button through hole 39 and the through hole 361 on the upper support member 36a in sequence. In the initial state, the elastic restoring force of the elastic member 37 will cause the button 38 to move toward the proximal side and make the button 38 in a locked state. At this time, the button through hole 39 and the through hole 361 are misaligned with each other. Since the button through hole 39 and the upper through hole 361 are in a misaligned state, the button 39 will provide the binding rope 35 with a force in the axial direction so that the binding rope 35 bends after entering the slide groove 362. The button 38 pulls the binding rope 35 in the axial direction, thereby limiting the binding rope 35. The binding rope 35 can overcome the elastic restoring force of the elastic seal 34 and maintain the binding of the elastic seal 34. When it is necessary to adjust the binding force of the binding line 35 on the elastic seal 34, pressing the button 38 causes the button 38 to overcome the elastic force of the elastic member 37 and move toward the distal end until the button through hole 39 is aligned with the through hole 361. Since the button through hole 39 is aligned with the upper through hole 361 at this time, that is, the button 38 no longer provides a pulling force in the axial direction to the binding rope 35, the button 38 is in an unlocked state. At this time, the driving member 39 can be pulled toward the proximal side to increase the binding force of the binding rope 35 on the elastic seal 34, reduce the inner cavity size of the elastic seal, and thus realize that the binding rope 35 binds the elastic seal 34 in the circumferential direction. In addition, at this time, the driving member 39 can also be moved toward the proximal side to release the binding line 35. At this time, the binding force of the binding rope 35 on the elastic seal 34 is reduced, and the elastic seal 34 will undergo elastic deformation and increase its inner cavity size. When the adjustment is completed, the button 38 is released. At this time, the button 38 moves toward the proximal side under the force of the elastic member 37, so that the button through hole 39 and the upper through hole 361 are misaligned and the locking of the binding rope 35 is restored, so that the inner cavity sealing size of the elastic seal 35 remains unchanged.

[0071] 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 vascular sheath, characterized in that: include: Tee connector; a sheath tube extending along the longitudinal axis and communicating with the three-way connector; A support member, the distal end of which is connected to the proximal end of the three-way connector; An elastic sealing member, disposed in the inner cavity of the support member and having a distal end connected to the three-way joint; A driving member, the driving member is rotatably connected to the supporting member, or is movably arranged outside the supporting member; A binding rope is wound around the outer periphery of the elastic seal, and its two free ends pass through the inner cavity of the support member. When the driving member rotates, the binding rope can be wound around the driving member, so that the binding rope can circumferentially bind the elastic seal, or the two free ends of the binding rope are fixedly connected to the driving member. When the driving member is pulled, the binding rope can circumferentially bind the elastic seal.

2. A vascular sheath according to claim 1, characterized in that: The support member is provided with a support rod, the driving member comprises a knob, a knob protrusion is provided in the knob, the support rod is rotatably inserted in the knob protrusion, and the restraining rope can be wound around the outer periphery of the knob protrusion.

3. A vascular sheath according to claim 2, characterized in that: It also includes a damping ring, which is interference-fitted in an annular space formed by the outer wall of the support rod and the inner wall of the knob protrusion.

4. A vascular sheath according to claim 3, characterized in that: An annular protrusion is arranged on the outer periphery of the support rod, and a step surface is arranged on the free end of the knob protrusion; the damping ring is arranged between the annular protrusion and the step surface.

5. A vascular sheath according to claim 2, characterized in that: The two free ends of the binding rope are fixed on the outer periphery of the knob protrusion.

6. A vascular sheath according to claim 2, characterized in that: The support rod is provided with a first separation groove which is radially penetrated, and the two free ends of the restraining rope are connected and hooked in the first separation groove; the knob is provided with a second separation groove which is radially penetrated, and the first separation groove and the second separation groove are aligned, and the restraining rope can pass through the second separation groove and at least a part of it is exposed at the two ends of the second separation groove.

7. A vascular sheath according to claim 2, characterized in that: The driving member also includes a winding wheel sleeved on the outer circumference of the support rod, the winding wheel has a radial through groove, and the two free ends of the restraining rope are connected and hooked in the radial through groove; the knob is provided with a knob protrusion that is engaged with the radial through groove.

8. A vascular sheath according to claim 7, characterized in that: At least one damping ring is interference-arranged in an annular space formed by the outer periphery of the support rod and the inner wall of the winding wheel.

9. A vascular sheath according to claim 1, characterized in that: The support member is also provided with a slide groove and two through holes, and the two through holes radially penetrate the inner and outer sides of the support member and pass through the slide groove; it also includes a button that can be slidably fitted in the slide groove, and the button is provided with two button through holes that can be aligned with the two through holes one by one, and the two free ends of the restraining rope pass through the through holes and the button through holes and are fixedly connected to the driving member.

10. A vascular sheath according to claim 9, characterized in that: The inner wall of the slide groove is provided with a limiting slide groove or a limiting protrusion, and the button is provided with a limiting protrusion or a limiting slide groove that cooperates with the limiting slide groove or the limiting protrusion.

11. The vascular sheath according to claim 9, characterized in that: It also includes an elastic member arranged in the slide slot, one end of the elastic member abuts against the bottom wall of the slide slot, and the other end abuts against the distal end side of the button.

12. A vascular sheath according to any one of claims 1 to 11, characterized in that: The support member is provided with rope guide members located on both sides in the lateral direction, and the two free ends of the binding rope pass through the rope guide members respectively.

13. A vascular sheath according to any one of claims 1 to 11, characterized in that: The outer circumference of the elastic seal is provided with a groove portion, and the tether rope is wound in the groove portion.

14. A vascular sheath according to any one of claims 1 to 11, characterized in that: The inner wall of the elastic sealing member is provided with a plurality of petal-shaped protrusions along the circumferential direction.

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