Vascular sheath allowing multiple instruments to pass through
By designing a combined structure of a three-way connector, sheath, and sealing gasket, the problem that existing vascular sheaths can only allow instruments to pass through at a time is solved, enabling multiple instruments to pass through simultaneously while maintaining a sealing effect, thus improving surgical efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIFETECH SCI (SHENZHEN) CO LTD
- Filing Date
- 2024-11-06
- Publication Date
- 2026-05-08
AI Technical Summary
Existing vascular sheaths can only allow one instrument to pass through at a time, which makes surgical procedures inconvenient and prolongs the operation time, and makes it impossible to allow multiple instruments to pass through simultaneously.
A vascular sheath structure including a three-way connector, a sheath, a sealing gasket, and an end cap was designed. By compressing different parts of the sealing gasket in different dimensions through the end cap, multiple instruments can pass through while maintaining a sealing performance.
This allows multiple instruments to pass through the vascular sheath simultaneously, balancing sealing and passage performance, thus reducing the difficulty and time of surgical procedures.
Smart Images
Figure CN121987301A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical devices, and in particular to a vascular sheath that allows multiple devices to pass through. Background Technology
[0002] In interventional vascular treatment, the first step is to establish and maintain vascular access. Vascular sheaths are used to assist various interventional catheters in entering arteries or veins during percutaneous catheterization, reducing blood loss and providing a stable surgical pathway.
[0003] Existing vascular sheaths often only allow one instrument to pass through at a time, such as a catheter or guidewire, and cannot allow multiple instruments to pass through simultaneously. When it is necessary to change instruments, the instrument already inside the vascular sheath must be removed from the sheath before another instrument can be inserted back into the sheath, which makes the operation inconvenient and prolongs the operation time. Summary of the Invention
[0004] Therefore, it is necessary to provide a vascular sheath that allows multiple instruments to pass through simultaneously while maintaining good sealing performance, addressing the aforementioned problems. Specifically, the vascular sheath includes: a three-way connector; a sheath tube extending axially, its proximal end communicating with the three-way connector; a sealing gasket disposed at the proximal end of the three-way connector, the sealing gasket having a boss on its proximal side, the boss having a tapered circumferential side portion, the boss having a through-hole assembly allowing the multiple instruments to pass through; and an end cap movably fitted onto the proximal end of the three-way connector, having an end cap protrusion, the end cap protrusion having a compression cone surface that mates with the circumferential side portion; when the end cap moves distally relative to the three-way connector, the compression cone surface compresses the circumferential side portion, causing the size of the through-hole assembly to decrease for a tight seal connection with the multiple instruments.
[0005] Furthermore, the sealing gasket also includes a connecting portion connected to the boss and located radially outward of the boss, the connecting portion being connected to the proximal end of the tee connector.
[0006] Furthermore, the distal end of the connecting portion has a connecting protrusion, and the proximal end of the tee joint has a proximal groove, with the connecting protrusion embedded in the proximal groove.
[0007] Furthermore, a vacancy groove is provided at the distal end of the connecting part and on the radially inner side of the connecting protrusion, and there is a gap between the inner periphery of the vacancy groove and the inner wall of the sheath.
[0008] Furthermore, the end cap protrusion is also provided with an axial pressing part corresponding to the connecting part, and the axial pressing part can press the connecting part.
[0009] Furthermore, the thickness of the connecting portion is less than the thickness of the boss.
[0010] Furthermore, the through-hole assembly includes a central hole disposed at the center of the boss and at least one peripheral hole offset from the center of the boss.
[0011] Furthermore, the peripheral holes are circular holes or elongated holes.
[0012] Furthermore, a tapered groove is provided at the near end of the boss, and the through hole assembly is disposed in the tapered groove.
[0013] Furthermore, the outer periphery of the proximal side of the tee connector is provided with a proximal external thread and a first limiting protrusion in sequence from the distal end to the proximal end; the inner cavity of the end cap is provided with an end cap internal thread and a second limiting protrusion in sequence from the distal end to the proximal end, the proximal external thread engages with the end cap internal thread, and the first limiting protrusion can abut against the second limiting protrusion to limit its movement.
[0014] Furthermore, it also includes a connecting sleeve, a head end, and a sealing ring. The distal end of the connecting sleeve has a flange. The sheath is fixedly embedded in the connecting sleeve. The connecting sleeve is embedded in the distal end of the tee joint, and the flange is exposed outside the tee joint. The sealing ring is disposed between the flange and the tee joint. The head end is movably sleeved on the distal end of the tee joint, and its inner wall abuts against the distal end of the connecting sleeve.
[0015] The technical solution of the present invention has the following beneficial effects:
[0016] The vascular sheath of the present invention allows multiple instruments to pass through simultaneously and enter the human body. Furthermore, the end caps squeeze different parts of the sealing gasket from two dimensions (directions), thus balancing the sealing performance and passage performance of the instruments. Attached Figure Description
[0017] Figure 1 A schematic diagram of the overall external structure of the vascular sheath;
[0018] Figure 2 An exploded view of the vascular sheath;
[0019] Figure 3 This is a cross-sectional view of the vascular sheath;
[0020] Figure 4 This is a three-dimensional structural diagram of a tee connector;
[0021] Figure 5 This is a sectional view of the end cap;
[0022] Figure 6 This is a three-dimensional structural diagram of the end cap;
[0023] Figure 7 This is a cross-sectional view of the sealing gasket;
[0024] Figure 8 This is a three-dimensional structural diagram of the sealing gasket;
[0025] Figure 9 A perspective view of another embodiment of the sealing gasket;
[0026] Figure 10 A structural diagram of the vascular sheath in its initial state;
[0027] Figure 11 This is a structural diagram of the sealing gasket after it has been compressed by the end cap. Detailed Implementation
[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "upper," "lower," "left," "right," and similar expressions used to indicate orientation are for illustrative purposes only and do not represent the only possible implementation.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0031] It should be noted that, for medical devices, the end of the medical device that is relatively closer to the operator is generally called the "proximal end," and the end that is relatively farther from the operator is called the "distal end." Based on this principle, the "proximal end" and "distal end" of any component of the delivery system are defined. "Proximal end" and "distal end" are only used to describe the orientation and do not refer to the end face of the proximal end or the end face of the distal end. "Axial axis" or "longitudinal axis" refers to the direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device. "Radial axis" or "lateral axis" refers to the direction perpendicular to the axial direction.
[0032] First Embodiment
[0033] See Figure 1 As shown, this embodiment provides a vascular sheath 100 that establishes a safe access route for other instruments to enter human blood vessels. It includes a three-way connector 50, with a three-way valve assembly 80 disposed on the outer periphery of the three-way connector 50. The three-way valve assembly 80 includes a flexible tube 81 connected to the three-way connector 50 and a three-way valve 82 connected to the end of the flexible tube 81. The distal end of the three-way connector 50 can communicate with the proximal end of an axially extending sheath 10 via a proximal end 20. An end cap 70 is movably fitted on the proximal side of the three-way connector 50, allowing instruments to enter the vascular sheath 100 from the proximal end of the end cap 70 and then into the human body via the sheath 10. Exemplarily, the device includes a first device 200 and a second device 200. The device can be a catheter, guidewire, or other interventional medical device.
[0034] See Figure 2-3As shown, the structure of the vascular sheath 100 will be further described. The connecting sleeve 40 is a hollow sleeve structure with a flange 41 on its distal end. The connecting sleeve 40 is embedded in the distal end cavity of the tee connector 50, while the flange 41 is exposed outside the tee connector 50. A sealing ring 30 is provided between the distal end face of the tee connector 50 and the flange 41. Specifically, the sealing ring 30 is sleeved on the outer periphery of the connecting sleeve 40 and located in the gap between the distal end face of the tee connector 50 and the flange 41. The proximal end of the sheath 10 is embedded in the inner cavity of the connecting sleeve 40 and is fixedly connected to the connecting sleeve 40. Specifically, the outer wall of the sheath 10 and the inner wall of the connecting sleeve 40 can be fixedly connected by bonding. Alternatively, other methods, such as melting, welding, or integral installation, can also be used to achieve the fixed connection between the sheath 10 and the connecting sleeve 40. The head end 20 is detachably fitted onto the proximal outer circumference of the tee connector 50. Specifically, the head end 20 and the distal end of the tee connector 50 are connected by threads. The distal end of the connecting sleeve 40 abuts against the inner wall of the head end 20, so that when the head end 20 is tightened on the tee connector 50, the head end 20 pushes the connecting sleeve 40 proximal relative to the tee connector 50, thereby compressing the sealing ring 30 located between the flange flange 41 and the tee connector 50 to ensure the sealing performance of the sealing ring 30. Furthermore, to further limit the positioning of the connecting sleeve 40, when the sealing ring 30 is compressed into a sealed state, the proximal end of the connecting sleeve 40 abuts against the distal step of the tee connector 50. Therefore, for the connecting sleeve 40, when the head end 41 is tightened on the tee connector 50, the proximal side of the connecting sleeve 40 abuts against the tee connector 50, and the distal side abuts against the head end 20, thereby limiting both ends of it. At this time, the sealing ring 30 is compressed to achieve a seal. In this embodiment, by providing the sealing ring 30, fluid is prevented from leaking out of the connection gap between the connecting sleeve 40 and the tee connector 50 after passing through the sheath 10 and thus leaking to the outside of the vascular sheath 100.
[0035] See also Figure 2-3As shown, a sealing gasket 60 is connected to the proximal end of the tee connector 50, thereby sealing the inlet end of the tee connector 50. The sealing gasket 60 has a through hole 62 for instruments to pass through. The end cap 70 is movably fitted onto the outer side of the proximal end of the tee connector 50. In this embodiment, a threaded connection is used to achieve the movable connection between the end cap 70 and the tee connector 50. When the end cap 70 is rotated to move distally relative to the tee connector 50, the end cap 70 compresses the sealing gasket 60, thereby reducing the size of the through hole 62 and decreasing the gap between the outer periphery of the instrument and the through hole 62, thus sealing the instrument inserted into the through hole 62 and preventing blood from flowing out of the through hole 62. Therefore, in this embodiment, the size of the through hole 62 can be adjusted by adjusting the tightness of the end cap 70 on the tee connector 50 (at different axial positions), thereby achieving sealing for instruments of different sizes.
[0036] See Figure 4 The structure of the tee connector 50 in this embodiment is described below. The tee connector 50 has a distal external thread 52 on its distal outer periphery and a proximal external thread 53 on its proximal outer periphery. A side branch 51 is provided between the distal external thread 52 and the proximal external thread 53. The distal external thread 52 is used to engage with the internal thread of the head end 20 to form a threaded connection, the proximal external thread 53 is used to engage with the internal thread of the end cap 70 to form a threaded connection, and the side branch 51 is used to communicate with the tee valve assembly 80. A proximal inner flange 56 and a proximal outer flange 57 are provided on the proximal side of the tee connector 50, and a proximal groove 54 is provided between the proximal inner flange 56 and the proximal outer flange 57. In this embodiment, the proximal groove 54 is an annular groove used to accommodate the sealing gasket 60. The proximal external thread 53 is located on the outer periphery of the proximal outer flange 57, and a first limiting protrusion 55 is also provided on the proximal side of the proximal outer flange 57.
[0037] See Figure 5-6The structure of the end cap 70 is described below. The end cap 70 is cylindrical with a hollow inner cavity. It has an internal thread 72 that matches the proximal external thread 53 of the tee connector 50 to form a threaded connection. A second limiting protrusion 73 is provided near the proximal end of the internal thread 72. This second limiting protrusion 73 engages with a first limiting protrusion 55 on the tee connector 50 to limit the travel of the end cap 70, preventing it from being excessively loosened and affecting the sealing performance. An end cap protrusion 71 is also provided on the bottom wall of the end cap 70, extending axially and having a certain height. An end cap through hole 74 is provided at the center of the end cap 70. The through hole 74 extends axially through the bottom wall and the end cap protrusion 71, communicating with the inner cavity of the end cap 70, thus creating an open structure on the proximal side of the end cap 70. The end protrusion 71 includes an axial pressing portion 711 located on the axial side and a tapered pressing portion 712 located on the radial side, the tapered pressing portion 712 communicating with the end cap through hole 74.
[0038] See Figure 7 The structure of the sealing gasket 60 in this embodiment is described below. The sealing gasket 60 is an overall disc-shaped sealing structure, which can be made of silicone, rubber, or other deformable sealing materials, such as Wacker silicone R401 / 30. The sealing gasket 60 includes a sealing gasket body 62 and a boss 61 located at the proximal center of the sealing gasket body 62. The boss 61 protrudes from the proximal side of the sealing gasket body 62, thus forming a protruding structure protruding towards the proximal end. In this embodiment, the sealing gasket 60 is an integrally formed structure, with the sealing gasket body 62 and the boss 61 integrally connected. There is no strict distinction between the sealing gasket body 62 and the boss 61; this distinction is merely for ease of description. The boss 61 is a protruding disc-shaped structure provided on the sealing gasket 60, while the other structures on the sealing gasket 60, excluding the boss 61, constitute the sealing gasket body 62 in this embodiment.
[0039] The boss 61 has a circumferentially extending circumferential side 611 located in the circumferential direction and an axially proximal end located in the axial direction. A through-hole assembly 63 is provided on the boss 61, which extends axially through both sides of the sealing gasket 60, thereby allowing an instrument to pass through the sealing gasket 60 along the through-hole 63.
[0040] For the circumferential side 611, in this embodiment it is set as a conical surface, so that the boss 61 is in the shape of a frustum, and the cross-sectional dimension of the boss 61 gradually decreases from the far end to the near end. The conical circumferential side 611 of the sealing gasket 60 matches the conical extrusion part 712 of the end cap 70, so that the conical extrusion part 712 can extrude on the circumferential side 611. By setting the circumferential side 611 as a conical surface, the circumferential side 611 and the radial conical extrusion part 712 of the end cap 70 have a larger contact area. When the end cap 70 is screwed in for the same stroke, the larger the contact area between the two, the greater the extrusion amount of the end cap 70 on the sealing gasket 60, the higher the extrusion utilization rate, and thus a better sealing effect can be achieved. In this embodiment, the taper of the circumferential side 611 is set to be equal to or substantially the same as that of the conical extrusion part, so that the two achieve the maximum contact area. Here, substantially equal means that the difference in the taper angle between the two is within ±3 degrees. In other embodiments, the circumferential side 611 may be configured as a straight surface, that is, it extends in a direction parallel or substantially parallel to the longitudinal axis. Here, substantially parallel means that the angle between the two is within plus or minus 3 degrees.
[0041] In this embodiment, the axial end is designed as a conical structure, resulting in a conical groove 612 on the proximal side of the boss 61. The cross-sectional dimensions of the conical groove 612 gradually decrease from the proximal end to the distal end. The axial end forms the proximal end of the sealing gasket 60. The through-hole assembly 63 is disposed within the conical groove 612. On one hand, the conical groove 612 reduces the length of the through-hole assembly 63, making it shorter than the thickness of the sealing gasket 61, thereby reducing the resistance to instrument passage. On the other hand, the conical groove 612 makes it easier for the boss 61 to deform radially when the circumferential side 611 is compressed, reducing the deformation force required for radial deformation. This facilitates adjustment of the through-hole assembly 63 by the operator by turning the end cap 70, reducing operational difficulty. Alternatively, in other embodiments, the conical groove may be omitted, and the circumferential end 612 may be designed as an end face structure perpendicular to the axial direction.
[0042] The sealing gasket body 62 has a connecting portion 621, which is located radially outward of the boss 61. Specifically, the portion of the sealing gasket body 62 without the boss 61, radially outward relative to the boss 61, constitutes the connecting portion 621. A connecting protrusion 622 and a recessed groove 624 are provided at the distal end of the connecting portion 621, with the recessed groove 624 located radially inward of the connecting protrusion 622. In this embodiment, the recessed groove 624 is an annular groove, including an inner peripheral portion 6241 and an outer peripheral portion 6242, with the outer peripheral portion 6242 located radially outward of the inner peripheral portion 6241. The connecting protrusion 622 can be embedded in the proximal recess 54 of the tee connector 50, thereby achieving connection between the sealing gasket 60 and the proximal side of the tee connector 50. In this embodiment, the thickness T of the connecting portion 621 is less than or equal to the thickness of the boss 61. The thickness T of the connecting portion 621 is set to be less than or equal to the thickness of the boss 61, so that when the connecting portion 621 is deformed under axial compression, its deformation has little impact on the linkage of the boss 61, the amount of deformation of the boss in the radial direction caused by its deformation is small, and its impact on the size of the through hole assembly 63 is minimal or negligible. In addition, the sealing gasket body 62 has a sealing gasket distal end face 623, which is disposed on both axial sides of the sealing gasket 60 opposite to the boss 61.
[0043] See Figure 8 As shown, the through-hole assembly 63 includes a central hole 63a located at the center of the boss and peripheral holes 63b offset from the center. There can be one or more peripheral holes 63b, such as two or three. When there are multiple peripheral holes 63b, they are evenly or unevenly distributed circumferentially around the central hole 63a. In this embodiment, the central hole 63a is mainly used for large-sized instruments (such as large stent catheters), while the peripheral holes 63b are mainly used for small-sized instruments (guidewires or small stent catheters). Therefore, the size of the central hole 63a is set larger than the size of the peripheral holes 63b to accommodate various instrument sizes. While large-sized instruments pass through the central hole, silicone can be squeezed to the periphery, ensuring a seal in the peripheral holes as well, thus achieving the function of multiple instruments passing through and sealing. The central hole 63a and peripheral holes 63b can be configured as circular holes. Considering that instruments such as catheters and guidewires have circular cross-sections, they are designed with circular holes to fit the shape of the instruments and ensure sealing performance.
[0044] In other embodiments, see Figure 9As shown, the peripheral hole 63b can also be designed as a strip-shaped hole. Considering the small area of a circular hole, instruments need to be aligned with the center of the hole to ensure smooth passage. However, in actual surgical procedures, accurately and quickly aligning the instrument with the peripheral hole is not easy, requiring the surgeon to spend more time and attention. Therefore, the peripheral hole can be designed as a strip-shaped hole. A strip-shaped hole has a larger area than a circular hole, making it easier to align and pass the instrument, thus greatly reducing the difficulty and time of the surgical procedure.
[0045] See Figure 10 The initial usage state of the vascular sheath 100 is described below. In the initial position, the end cap 70 is screwed onto the tee connector 50, and the second limiting protrusion 73 on the end cap 70 and the first limiting protrusion 55 on the tee connector 50 are just engaged (at this time, the two are in abutting contact with each other). At this time, the axial compression portion 711 on the end cap 70 slightly compresses the connecting portion 621 of the sealing gasket 60 in the axial direction, and the conical compression portion 712 on the end cap 70 slightly compresses the boss 61 of the sealing gasket 60. At this time, the end cap 70 and the sealing gasket 60 are in contact but the interaction force is very small, the deformation of the sealing gasket 60 is small, and the size of the through hole does not change much.
[0046] See Figure 11 As shown, when it is necessary to reduce the size of the through-hole assembly 63 to achieve a seal on the instrument, rotating the end cap 70 causes the second limiting protrusion 73 to move distally and separate from the first limiting protrusion 55. The dashed line represents the shape of the sealing gasket 60 before deformation, and the solid line represents the shape of the sealing gasket after deformation. At this time, the end cap 70 will compress the sealing gasket 60, causing it to deform. On one hand, the axial compression portion 711 of the end cap 70 will compress the connecting portion 621 of the sealing gasket 60 in the axial direction; that is, the connecting portion 621 will be compressed in the axial direction by a first axial force F4. When the connecting portion 621 is compressed, it tightly adheres to both the end cap and the tee connector 50, thereby sealing the connection between the tee connector 50 and the end cap 70 and preventing liquid from leaking out of the vascular sheath 100. On the other hand, the conical compression portion 712 of the end cap 70 compresses the circumferential side 611 of the sealing gasket 60, subjecting the boss 61 to a second force F3 that is horizontally inclined and radially inward. This second force F3 can be decomposed into a first component F1 along the axial direction and a second component F2 along the radial direction. The second component F2 compresses the boss 61 radially, reducing the size of the through-hole assembly 63 located at the boss 61 and achieving a seal on the device. Therefore, by rotating the end cap 60, both sealing the proximal side of the vascular sheath 100 and adjusting the size of the through-hole assembly 60 can be achieved simultaneously.
[0047] In existing technologies, the distal end and circumferential side of the sealing gasket are typically constrained. By compressing the proximal end of the gasket, i.e., compressing the gasket as a whole along the axial direction, the gasket is shortened in the axial direction. Because the distal end and circumferential side of the gasket are constrained, the gasket cannot deform distally or expand radially outward; it can only deform radially inward. This radially inward deformation reduces the size of the through-hole in the gasket, thereby tightly wrapping around the outer periphery of the instrument and achieving a seal.
[0048] Unlike existing technologies that deform the sealing gasket as a whole by axial compression, the sealing gasket 60 in this embodiment has a connecting portion 621 and a boss 61. The connecting portion 621 and the boss 61 are deformed by the compressive forces of the axial compression portion 711 and the conical compression portion 712 of the end cap 70, respectively. Therefore, the sealing gasket 60 does not deform as a whole under the compression of the end cap 70, but rather deforms separately on the connecting portion 621 and the boss 61. When the connecting portion 621 is compressed in the axial direction, the first force F4 acts only on the connecting portion 621 and does not directly cause deformation of the boss 61. In addition, since the amount of axial compression of the connecting portion 621 is small, the radial deformation caused by axial compression is small. Therefore, the compression of the connecting portion 621 basically does not cause deformation of the boss 61 (this deformation is very small and negligible). See also... Figure 11As shown, the inner periphery 6241 of the recess 624 on the connecting part 621 does not abut against the inner wall 58 of the tee connector 50, that is, there is a certain distance between the inner wall 58 and the inner periphery 6241. Therefore, when the axial pressing part 711 presses the connecting part 621, it only presses a part of the connecting part 621, and does not press the entire area of the connecting part 621. The unpressed part of the connecting part 621 constitutes the transition part (the part between the inner periphery 6241 and the inner wall 58). Since the transition part is not directly pressed by the axial pressing part 711, it will not be directly deformed by the pressing of the first axial force F4, but will only undergo slight indirect deformation (due to the deformation of the pressed part of the connecting part 621 causing the transition part to deform). Since the deformation of the transition part itself is small, and in this embodiment, the transition part is connected to the boss 61, the existence of the transition part will further reduce the influence of the deformation of the connecting part 621 on the deformation of the boss 61. Similarly, the compression of the boss 61 by the second force F3 will not cause deformation of the connecting part 621. Therefore, in this embodiment, the two parts of the end cap 70 apply compressive force to the boss 61 and the connecting part 611 of the sealing gasket 60 respectively, so that the boss 61 and the connecting part 611 deform independently. On the one hand, since the boss 61 and the connecting part 611 are subjected to force and deformation respectively, tightening the end cap 70 can simultaneously achieve the sealing of the proximal connection between the end cap 70 and the tee connector 50 (achieved by compressing the connecting part 611) and the sealing of the instrument (achieved by squeezing the boss 60). On the other hand, since the size of the through hole assembly 63 can be reduced simply by squeezing the boss 60 with the second force F3, without needing to squeeze the sealing gasket 60 as a whole to adjust the through hole size, the method in this embodiment is easier to adjust the through hole size and has higher adjustment efficiency than the method of squeezing the sealing gasket as a whole. Finally, since the adjustment of the through hole assembly size can be achieved by applying the downward oblique second force F3 to the boss 60, this embodiment does not limit the circumferential or distal side of the boss 60, that is, the sealing gasket 60 is not compressed as a whole, and the boss 60 can still deform freely at this time. See, for example. Figure 11 As shown, under the compression of the end cap 70, since the distal end face 623 of the sealing pad is a free end and can deform freely, it will change from a flat surface (see the dotted line) to an arched surface (see the implementation diagram). Therefore, since the second force F3 does not compress the sealing pad 60 as a whole, the elastic pressure of the sealing pad 60 acting on the device as a whole is reduced, which reduces the frictional resistance between the sealing pad 60 and the device, thereby giving the device good passage ability and preventing it from being difficult to push due to excessive friction with the sealing pad 60. In summary, the vascular sheath 100 in this embodiment adopts the above structure, which can simultaneously achieve sealing at the proximal connection of the three-way connector 50 and adjust the size of the through-hole assembly, making it easier to adjust the size of the through-hole assembly 53, and giving the device good passage performance.
[0049] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. The scope of protection of this patent should be determined by the appended claims.
Claims
1. A vascular sheath that allows multiple instruments to pass through, characterized in that, include: T-connector; The sheath extends axially, and its proximal end communicates with the tee connector; A sealing gasket is disposed at the proximal end of the tee connector. The proximal end of the sealing gasket has a boss with a tapered circumferential side and a through-hole assembly for the passage of the multi-instrument. An end cap is movably fitted onto the proximal end of the tee connector and has an end cap protrusion. The end cap protrusion is provided with a pressing conical surface that mates with the circumferential side portion. As the end cap moves distally relative to the tee connector, the extrusion cone presses against the circumferential side, causing the through-hole assembly to shrink in size for a hermetically sealed connection with the multi-instrument.
2. The vascular sheath that allows multiple instruments to pass through according to claim 1, characterized in that, The sealing gasket also includes a connecting portion connected to the boss and located radially outside the boss, the connecting portion being connected to the proximal end of the tee connector.
3. A vascular sheath that allows multiple instruments to pass through, as described in claim 2, is characterized in that... The distal end of the connector has a connecting protrusion, and the proximal end of the tee joint has a proximal groove, with the connecting protrusion embedded in the proximal groove.
4. A vascular sheath that allows multiple instruments to pass through, as described in claim 3, is characterized in that, The distal end of the connector and the radially inner side of the connector protrusion are provided with a vacancy groove, and there is a gap between the inner periphery of the vacancy groove and the inner wall of the sheath.
5. A vascular sheath that allows multiple instruments to pass through, as described in claim 2, is characterized in that, The end cap protrusion is also provided with an axial pressing part corresponding to the connecting part, and the axial pressing part can press the connecting part.
6. A vascular sheath that allows multiple instruments to pass through, as described in claim 2, is characterized in that... The thickness of the connecting part is less than the thickness of the boss.
7. A vascular sheath that allows multiple instruments to pass through according to claim 1, characterized in that, The through-hole assembly includes a central hole located at the center of the boss and at least one peripheral hole offset from the center of the boss.
8. A vascular sheath that allows multiple instruments to pass through according to claim 7, characterized in that, The peripheral holes are circular or elongated.
9. A vascular sheath that allows multiple instruments to pass through according to claim 7, characterized in that, The proximal end of the boss is provided with a tapered groove, and the through hole assembly is disposed in the tapered groove.
10. A vascular sheath that allows multiple instruments to pass through according to claim 1, characterized in that, The tee connector has a proximal external thread and a first limiting protrusion arranged sequentially from the distal end to the proximal end on its proximal side outer periphery; the end cap has an end cap internal thread and a second limiting protrusion arranged sequentially from the distal end to the proximal end on its inner cavity, the proximal external thread engages with the end cap internal thread, and the first limiting protrusion can abut against the second limiting protrusion to limit its movement.
11. A vascular sheath that allows multiple instruments to pass through according to claim 1, characterized in that, It also includes a connecting sleeve, a head end, and a sealing ring. The connecting sleeve has a flange on its distal end. The sheath is fixedly embedded in the connecting sleeve. The connecting sleeve is embedded in the distal end of the tee joint, and the flange is exposed outside the tee joint. The sealing ring is disposed between the flange and the tee joint. The head end is movably sleeved on the distal end of the tee joint, and its inner wall abuts against the distal end of the connecting sleeve.