Blood vessel sheath structure capable of preventing blood leakage

Abstract

The invention discloses a blood vessel sheath structure capable of preventing blood leakage. Comprising a catheter sheath, a connector fixedly connected with one end of the catheter sheath, a catheter sheath base connected with the catheter sheath through the connector, an end cover assembly detachably installed at the end, away from the catheter sheath, of the catheter sheath base, and a connecting base fixedly arranged on one side of the catheter sheath base. The hose is connected with the pipe sheath seat through the connecting seat; the three-way valve is connected to one end, far away from the pipe sheath seat, of the hose; the middle of the reinforcing gasket protrudes to press the hemostasis valve, so that the hemostasis valve is recessed towards the far end of the sheath tube, the hemostasis strength of the hemostasis valve is enhanced, and the purpose of preventing blood leakage is achieved. The initial protruding degree of the reinforcing pad relative to the sealing cap is changed through pre-adjustment of the end cover assembly, the hemostasis valve can be suitable for guide wires of different specifications or embedded instruments, the guide wires can smoothly pass through, and meanwhile the influence on deformation of the hemostasis valve is reduced to the minimum.

Description

Technical Field

[0001] The present invention belongs to the technical field of vascular sheaths, and particularly relates to a vascular sheath structure for preventing blood leakage. Background Art

[0002] During the operation, the vascular sheath establishes a channel for the blood vessel. When the vascular sheath is inserted into the blood vessel, due to the blood flow pressure in the blood vessel, blood leakage or dripping of the hemostatic valve in the vascular sheath is likely to occur. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a vascular sheath structure for preventing blood leakage.

[0004] The technical solution adopted by the present invention is as follows: A vascular sheath structure for preventing blood leakage, comprising a catheter sheath, a connection head fixedly connected to one end of the catheter sheath, a sheath seat connected to the catheter sheath through the connection head, an end cap assembly detachably installed at the end of the sheath seat away from the catheter sheath, a connection seat fixedly arranged on one side of the sheath seat, a flexible tube connected to the sheath seat through the connection seat, and a three-way valve connected to the end of the flexible tube away from the sheath seat; A hemostatic valve is arranged in the sheath seat. A bowl-shaped part is formed in the center of the hemostatic valve, and a self-sealing seam is arranged in the center of the bowl-shaped part; a reinforcing pad is arranged between the hemostatic valve and the end cap assembly. A conical part is formed in the center of the reinforcing pad, and the conical part presses the hemostatic valve to keep the hemostatic valve convex toward the side where the catheter sheath is located; The end cap assembly includes a sealing cap and a control pad. The sealing cap is threadedly connected to the sheath seat. The control pad is located between the sealing cap and the reinforcing pad, and the control pad is used to adjust the pressing degree of the reinforcing pad on the hemostatic valve; a positioning groove is fixedly arranged at one end of the sealing cap away from the catheter sheath, and a reference groove is fixedly arranged on the circumferential side of the sheath seat, and the reference groove cooperates with the positioning groove.

[0005] Preferably, the sheath seat includes a connecting part located inside the connecting head. A connecting cavity and an installation cavity communicating with each other are formed inside the sheath seat. The connecting cavity corresponds to the connecting part, and the connecting cavity communicates with the catheter sheath. A guiding part is formed on the inner wall of the sheath seat between the connecting cavity and the installation cavity; an injection hole corresponding to the connection seat is arranged on one inner wall of the installation cavity, and the injection hole communicates with the flexible tube; the hemostatic valve and the reinforcing pad are located in the installation cavity.

[0006] Preferably, a placement hole is arranged in the center of the end cap assembly, and a through hole is arranged in the center of the reinforcing pad. A guide wire can sequentially pass through the catheter sheath, the connecting cavity, the installation cavity, the self-sealing seam, the through hole, and the placement hole.

[0007] Preferably, in the present invention, the placement cavity is stepped, the inner diameter of the placement cavity near the capping member is larger than the inner diameter of the placement cavity near the catheter sheath, and the hemostatic valve is embedded at the step of the placement cavity; a first limiting groove is fixedly provided on the inner wall of the placement cavity near the capping member, a first limiting pin is fixedly provided on the periphery of the reinforcing pad, the reinforcing pad is slidably connected to the sheath base, and the first limiting pin cooperates with the first limiting groove.

[0008] Preferably, in the present invention, an inner snap ring and an outer snap ring are fixedly provided at one end of the capping member near the catheter sheath, a placement groove is formed between the inner snap ring and the outer snap ring, the control pad is installed in the placement groove, a spiral groove is fixedly provided on the inner wall of the placement groove, a sliding rod is fixedly provided on the periphery of the reinforcing pad, and the sliding rod is slidably connected to the spiral groove.

[0009] Preferably, in the present invention, calibration scales are provided on the end face of the capping member near the catheter sheath, a positioning ring is fixedly provided at one end of the control pad near the catheter sheath, positioning scales are provided on the positioning ring, and the positioning scales cooperate with the calibration scales.

[0010] Preferably, in the present invention, the end cap assembly further includes a rotating ring and a control ring located between the reinforcing pad and the capping member. A receiving groove is fixedly provided at one end of the control pad near the capping member, the rotating ring is slidably connected to the receiving groove, a second limiting groove is provided on the receiving groove, a second limiting pin is fixedly provided on the end face of the rotating ring near the catheter sheath, the second limiting pin cooperates with the second limiting groove, a torsion spring is provided inside the rotating ring, one end of the torsion spring is fixedly connected to the inner side wall of the rotating ring, the other end of the torsion spring is fixedly connected to the inner snap ring, an installation groove is fixedly provided at one end of the rotating ring near the capping member, a wedge-shaped tooth is fixedly provided in the installation groove, a limiting tooth is fixedly provided at one end of the control ring away from the capping member, and the wedge-shaped tooth and the limiting tooth cooperate.

[0011] Preferably, in the present invention, an extension groove is fixedly provided at one end of the placement groove away from the catheter sheath, the control ring is located in the extension groove, the control ring is slidably connected to the extension groove, a third limiting groove is fixedly provided on the extension groove, a third limiting pin is fixedly provided at one end of the control ring away from the catheter sheath, and the third limiting pin cooperates with the third limiting groove.

[0012] Preferably, a control spring is provided at one end of the control ring away from the catheter sheath. One end of the control spring is fixedly connected to the control ring, and the other end of the control spring is fixedly connected to the inner wall of the extension groove. On the outer side of the end of the rotating ring away from the catheter sheath, a side ring groove is provided, and a limiting ring is fixedly provided on the inner wall of the placement groove. The limiting ring is rotatably connected to the side ring groove.

[0013] Preferably, a friction portion is provided on the outer side of the positioning ring. The friction portion cooperates with the conical portion. When the friction portion and the conical portion are externally squeezed, they will rotate synchronously under the action of friction force.

[0014] The beneficial effects of the present invention are as follows: As a blood leakage prevention vascular sheath structure, the present invention presses the hemostatic valve by the protrusion in the middle of the reinforcing gasket, so that the hemostatic valve forms a depression in the direction of the distal end of the sheath tube, strengthening the hemostatic strength of the hemostatic valve and achieving the purpose of preventing blood leakage; through the pre-adjustment of the end cap assembly, the initial protrusion degree of the reinforcing gasket relative to the sealing cap is changed, which can be applicable to different specifications of guide wires or implanting instruments, enabling the guide wire to pass smoothly while minimizing the influence on the deformation of the hemostatic valve; when it is necessary to repeatedly insert a guide wire or other implanting instruments, the extrusion degree of the reinforcing gasket on the hemostatic valve can be further increased in subsequent operations to ensure that the hemostatic valve still has good pressure-bearing capacity after being penetrated multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following further describes the present invention in detail with reference to the drawings and specific implementation methods.

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is the present invention Figure 1 front view structural diagram; Figure 3 is the present invention Figure 2 cross-sectional structural diagram; Figure 4 is the present invention Figure 3 magnified structural diagram at A; Figure 5 is the present invention Figure 4 magnified structural diagram at B; Figure 6 is the present invention Figure 1 exploded structural diagram; Figure 7 is the present invention Figure 6 schematic structural diagram after hiding the catheter sheath and the hose; Figure 8 is the present invention Figure 7 exploded structural diagram of the end cap assembly; Figure 9is the present invention Figure 8 Schematic diagram of the enlarged structure at position C of the present invention; Figure 10 is the present invention Figure 8 Schematic diagram of the rear view structure of the present invention; Figure 11 is the present invention Figure 10 Schematic diagram of the enlarged structure at position D of the present invention. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but only represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0019] The following will be combined with Figure 1 - 11 to illustrate the specific implementation manners of the present invention. A blood leakage-proof vascular sheath structure includes a catheter sheath 11, a connection head 12 fixedly connected to one end of the catheter sheath 11, a sheath base 13 connected to the catheter sheath 11 through the connection head 12, an end cap assembly 14 detachably installed at one end of the sheath base 13 away from the catheter sheath 11, a connection seat 15 fixedly provided on one side of the sheath base 13, a flexible hose 16 connected to the sheath base 13 through the connection seat 15, and a three-way valve 17 connected to one end of the flexible hose 16 away from the sheath base 13; A hemostatic valve 24 is provided in the sheath base 13. A bowl-shaped portion 38 is formed at the center of the hemostatic valve 24, and a self-sealing seam 22 is provided at the center of the bowl-shaped portion 38; a reinforcing pad 20 is provided between the hemostatic valve 24 and the end cap assembly 14. A tapered portion 40 is formed at the center of the reinforcing pad 20. The tapered portion 40 presses the hemostatic valve 24 to keep the hemostatic valve 24 convex toward the side where the catheter sheath 11 is located; the center of the hemostatic valve 24 protrudes distally to form a dome structure, enhancing the hemostatic strength of the hemostatic valve 24 so that it can withstand greater pressure, achieving the purpose of preventing blood leakage and dripping. The shape of the tapered portion 40 is approximately the thin-walled side of a frustum of a cone.

[0020] The end cap assembly 14 includes a sealing cap 23 and a control pad 21. The sealing cap 23 is threadedly connected to the sheath base 13. The control pad 21 is located between the sealing cap 23 and the reinforcing pad 20. The control pad 21 is used to adjust the squeezing degree of the reinforcing pad 20 on the hemostatic valve 24. A positioning groove 47 is fixedly provided at one end of the sealing cap 23 away from the catheter sheath 11, and a reference groove 36 is fixedly provided on the circumferential side of the sheath base 13. The reference groove 36 cooperates with the positioning groove 47. The sealing cap 23 is used to push the reinforcing pad 20 close to the hemostatic valve 24. By controlling the pushing degree of the sealing cap 23 on the reinforcing pad 20, the deformation degree of the hemostatic valve 24 is controlled, so that the guide wire can pass smoothly while minimizing the influence of the deformation of the hemostatic valve 24, ensuring that the hemostatic valve 24 still has a good sealing and shielding effect after the subsequent guide wire is withdrawn.

[0021] Advantageously, the sheath base 13 includes a connecting portion 26 located inside the connector 12. A connecting cavity 27 and a placement cavity 19 that communicate with each other are formed inside the sheath base 13. The connecting cavity 27 corresponds to the connecting portion 26. The connecting cavity 27 communicates with the catheter sheath 11. A guiding portion 25 is formed on the inner wall of the sheath base 13 between the connecting cavity 27 and the placement cavity 19. An injection hole 18 corresponding to the connecting seat 15 is provided on one inner wall of the placement cavity 19. The injection hole 18 communicates with the flexible tube 16. The hemostatic valve 24 and the reinforcing pad 20 are located in the placement cavity 19. The guiding portion 25 is used to guide the passage of the guide wire and reduce the subsequent insertion difficulty of the guide wire.

[0022] Advantageously, a placement hole 46 is provided at the center of the end cap assembly 14, and a through hole 41 is provided at the center of the reinforcing pad 20. The guide wire can sequentially pass through the catheter sheath 11, the connecting cavity 27, the placement cavity 19, the self-sealing seam 22, the through hole 41, and the placement hole 46. The path allowed for the guide wire to pass through is two-way. When the catheter sheath 11 is first inserted, the guide wire passes through the catheter sheath 11, and when inserted subsequently, it is inserted from one side of the end cap assembly 14. During subsequent surgical treatments, with the catheter sheath 11 remaining in place, in addition to the guide wire, it can also be used to pass through a dilator or other instruments.

[0023] Advantageously, the placement cavity 19 is stepped, the inner diameter of the placement cavity 19 near the side of the sealing cap 23 is larger than the inner diameter of the placement cavity 19 near the side of the catheter sheath 11, and the hemostatic valve 24 is embedded at the step of the placement cavity 19; a first limiting groove 37 is fixedly arranged on the inner wall of the placement cavity 19 near the side of the sealing cap 23, a first limiting pin 39 is fixedly arranged on the periphery of the reinforcing pad 20, the reinforcing pad 20 is slidably connected with the sheath base 13, and the first limiting pin 39 cooperates with the first limiting groove 37. The edge of the hemostatic valve 24 closely adheres to the step portion of the placement cavity 19, and the conical portion 40 of the reinforcing pad 20 squeezes the bowl-shaped portion 38 in the middle of the hemostatic valve 24, and the degree of squeezing determines the protruding degree of the bowl-shaped portion 38.

[0024] Advantageously, an inner snap ring 29 and an outer snap ring 59 are fixedly arranged at one end of the sealing cap 23 close to the catheter sheath 11, a placement groove 33 is formed between the inner snap ring 29 and the outer snap ring 59, the control pad 21 is installed in the placement groove 33, a spiral groove 55 is fixedly arranged on the inner wall of the placement groove 33, and a sliding rod 43 is fixedly arranged on the periphery of the reinforcing pad 20, and the sliding rod 43 is slidably connected with the spiral groove 55. There are two spiral grooves 55, which are rotationally symmetrically arranged and cooperate with the two sliding rods 43 respectively.

[0025] Advantageously, calibration scales 54 are arranged on the end face of the sealing cap 23 close to the catheter sheath 11, a positioning ring 57 is fixedly arranged at one end of the control pad 21 close to the catheter sheath 11, and alignment scales 58 are arranged on the positioning ring 57, and the alignment scales 58 cooperate with the alignment scales 58. The relative rotation angle between the control pad 21 and the sealing cap 23 can be known through the alignment scales 58, so as to know the protruding degree of the control pad 21, and there is a proportional relationship between the two.

[0026] Advantageously, the end cap assembly 14 further includes a rotating ring 35 and a control ring 30 located between the reinforcing pad 20 and the sealing cap 23, a receiving groove 28 is fixedly arranged at one end of the control pad 21 close to the sealing cap 23, the rotating ring 35 is slidably connected with the receiving groove 28, a second limiting groove 45 is arranged on the receiving groove 28, a second limiting pin 42 is fixedly arranged on the end face of the rotating ring 35 close to the catheter sheath 11, the second limiting pin 42 cooperates with the second limiting groove 45, a torsion spring 50 is arranged inside the rotating ring 35, one end of the torsion spring 50 is fixedly connected with the inner side wall of the rotating ring 35, and the other end of the torsion spring 50 is fixedly connected with the inner snap ring 29. The torsion spring 50 has a tendency to rotate the control pad 21 in one direction, and when the control pad 21 loses restraint, the control pad 21 will automatically reset.

[0027] Beneficially, one end of the rotating ring 35 close to the sealing cap 23 is fixedly provided with an installation groove 48, a wedge-shaped tooth 49 is fixedly arranged in the installation groove 48, one end of the control ring 30 away from the sealing cap 23 is fixedly provided with a limit tooth 51, the wedge-shaped tooth 49 is engaged with the limit tooth 51, one end of the placement groove 33 away from the catheter sheath 11 is fixedly provided with an extension groove 44, the control ring 30 is located in the extension groove 44, the control ring 30 is slidably connected with the extension groove 44, a third limit groove 60 is fixedly arranged on the extension groove 44, one end of the control ring 30 away from the catheter sheath 11 is fixedly provided with a third limit pin 52, and the third limit pin 52 is engaged with the third limit groove 60. The wedge-shaped tooth 49 and the limit tooth 51 are locked unidirectionally. The control spring 31 always has a tendency to make the control ring 30 close to the wedge-shaped tooth 49, and the torsion spring 50 has a tendency to make the wedge-shaped tooth 49 rotate relative to the limit tooth 51; under normal circumstances, when the control pad 21 is rotated manually, the control pad 21 and the sealing cap 23 rotate relatively. Taking the sealing cap 23 as a reference, the sealing cap 23 does not move, and the control pad 21 rotates in one direction; the control ring 30 and the sealing cap 23 maintain a posture with an unchanged angle, the rotating ring 35 rotates together with the control pad 21, and the side ring groove 34 rotates relative to the limit ring 32. Affected by the cooperation of the sliding rod 43 and the spiral groove 55, the control pad 21 will move axially along the end cap assembly 14 when rotating. The movement of the control pad 21 causes an axial relative displacement between the control pad 21 and the rotating ring 35, and the second limit pin 42 and the second limit groove 45 slide, but will not separate, without affecting the synchronous rotation of the rotating ring 35 and the control pad 21; when the wedge surface of the wedge-shaped tooth 49 reaches the tooth top of the limit tooth 51, since the axial position of the rotating ring 35 is restricted by the side ring groove 34 and the limit ring 32, the wedge surface of the wedge-shaped tooth 49 will push the limit tooth 51 and the control ring 30 to move axially, and the control spring 31 is compressed. After the wedge surface of the wedge-shaped tooth 49 passes the tooth top of the limit tooth 51, the control ring 30 immediately rebounds under the action of the control spring 31. The limit tooth 51 and the wedge-shaped tooth 49 cooperate to prevent the control pad 21 from rotating in the reverse direction. The torsion spring 50 has a tendency to make the rotating ring 35 and the sealing cap 23 rotate back. Therefore, without applying an external force, or the applied force cannot overcome the torsion spring 50 and the control spring 31, the control pad 21 will not rotate spontaneously.

[0028] Advantageously, a control spring 31 is provided at one end of the control ring 30 away from the catheter sheath 11. One end of the control spring 31 is fixedly connected to the control ring 30, and the other end of the control spring 31 is fixedly connected to the inner wall of the extension groove 44; a side ring groove 34 is provided on the outer side of one end of the rotating ring 35 away from the catheter sheath 11, and a limiting ring 32 is fixedly provided on the inner wall of the placement groove 33. The limiting ring 32 is rotatably connected to the side ring groove 34. The side ring groove 34 restricts the axial displacement of the rotating ring 35, and the rotating ring 35 can only rotate relative to the sealing cap 23. The control ring 30 is made of iron material. When the control pad 21 is manually rotated, it can only be rotated in one allowed direction. If the rotation is excessive, a strong magnetic plate is needed. Place the end cap assembly 14 with the calibrated scale 54 facing up on the strong magnetic plate. The iron control ring 30 is attracted by the magnet, overcoming the elastic force of the control spring 31. The control spring 31 is compressed, and the control ring 30 and the rotating ring 35 are kept away from each other. The limiting tooth 51 and the wedge tooth 49 are separated. At this time, the control pad 21 is allowed to be rotated in the reverse direction. Under the action of the torsion spring 50, the rotating ring 35 automatically rotates back to reset the rotation angle of the control pad 21.

[0029] Advantageously, a friction portion 56 is provided on the outer side of the positioning ring 57. The friction portion 56 cooperates with the conical portion 40. When the friction portion 56 and the conical portion 40 are externally squeezed, they will rotate synchronously under the action of friction force. The contact portion between the friction portion 56 and the conical portion 40 is rough, and relative rotation between the two is not likely to occur through extrusion.

[0030] The working principle of the present invention: In the initial state, the end cap assembly 14 and the tube sheath base 13 are in a disassembled state. Before use, the end cap assembly 14 is pre-adjusted according to the specification of the guide wire; the position of the control pad 21 relative to the sealing cap 23 is manually rotated, and it is judged whether the control pad 21 is rotated to the required position according to the corresponding positions of the calibration scale 54 and the alignment scale 58. The smaller the diameter of the guide wire, the larger the rotation angle, and the higher the height of the control pad 21 protruding relative to the placement groove 33. After the end cap assembly 14 and the tube sheath base 13 are installed, the farther the control pad 21 pushes the reinforcing pad 20, the greater the degree of extrusion of the hemostatic valve 24 by the reinforcing pad 20, and the smaller the amplitude allowed for the hemostatic valve 24 to rebound to the concave side. When the guide wire passes through the self-sealing seam 22 from the convex side of the hemostatic valve 24, it will not cause excessive deformation of the hemostatic valve 24. After the guide wire passes through, the hemostatic valve 24 rebounds to make the sealing effect after the self-sealing seam 22 is closed better, and the hemostatic effect is better; on the contrary, the larger the diameter of the guide wire, the smaller the rotation angle, and the greater the amplitude allowed for the hemostatic valve 24 to rebound to the concave side, and the guide wire is more likely to pass through the self-sealing seam 22 from the convex side of the hemostatic valve 24. By controlling the amplitude of the hemostatic valve 24 rebounding to the concave side, while enabling the guide wire to pass smoothly, the influence on the deformation of the hemostatic valve 24 is minimized.

[0031] Install after pre - adjustment. After the hemostatic valve 24 and the reinforcing pad 20 are respectively placed into the placement cavity 19, screw the end - cap assembly 14 onto the cannula sheath base 13. There is a limiting structure at the connection between the end - cap assembly 14 and the cannula sheath base 13. It must be ensured that the positioning groove 47 is aligned with the reference groove 36 before tightening. When the positioning groove 47 and the reference groove 36 are aligned, turn the end - cap assembly 14. After rotating one week, ensure that the positioning groove 47 is aligned with the reference groove 36 again and then stop. After stopping, there is still a certain space between the end - cap assembly 14 and the cannula sheath base 13; at this time, change the reference object. Take the cannula sheath base 13 as the reference object and keep the cannula sheath base 13 stationary while rotating the end - cap assembly 14. During this process, the positioning ring 57 of the control pad 21 gradually approaches the reinforcing pad 20, the reinforcing pad 20 slides, and the first limit pin 39 and the first limit groove 37 slide. Until the conical part 40 pushes and squeezes the bowl - shaped part 38. At first, the friction force between the conical part 40 and the torsion spring 50 is small. As the extrusion deepens, the friction force between the conical part 40 and the torsion spring 50 gradually increases. The pre - adjusted position of the control pad 21 affects the moment of reaching the critical value. The more the control pad 21 protrudes, the faster it reaches the critical value; After reaching the critical value, continue to rotate the end - cap assembly 14. Due to the friction force between the conical part 40 and the friction part 56, the positioning ring 57 and the control pad 21 cannot rotate relative to the cannula sheath base 13. Continuing to rotate the end - cap assembly 14 causes the sealing cap 23 and the control pad 21 to rotate relative to each other. The same as the above pre - adjustment principle, the relative rotation of the sealing cap 23 and the control pad 21 will cause the protrusion degree of the control pad 21 to increase, thereby further forcing the reinforcing pad 20 to squeeze the hemostatic valve 24. The greater the degree of extrusion of the hemostatic valve 24, the less likely it is to rebound.

[0032] After adjustment, perform the operation normally. Use the guide wire to insert the catheter sheath 11 into the designated position of the target blood vessel. The proximal end of the guide wire will sequentially pass through the catheter sheath 11, the connection cavity 27, the placement cavity 19, the self - sealing seam 22, the through - hole 41, and the insertion hole 46. When the catheter sheath 11 reaches the designated position, fix it, and then withdraw the guide wire. After the guide wire is withdrawn, the hemostatic valve 24 closes at the self - sealing seam 22. The hemostatic valve 24 isolates its left and right sides. The structure of the hemostatic valve 24 protruding towards the distal end can ensure that the hemostatic valve 24 can withstand a large pressure without deformation, achieving the purpose of preventing blood leakage and seepage.

[0033] Within a certain period after the operation, the sheath tube is retained. During the observation period, if necessary, the guide wire can be reinserted from the proximal end for adjustment. After the guide wire is inserted twice or multiple times, in order to avoid the shielding effect from decreasing after the self-sealing seam 22 is opened and closed multiple times, the end cap assembly 14 can be further screwed relative to the tube sheath base 13. Based on the same principle as above, further screwing will further squeeze the hemostatic valve 24. Within a certain range, the greater the degree of compression on the hemostatic valve 24, the fuller the convex degree of the bowl-shaped portion 38, the less likely it is to collapse, and the greater the pressure-bearing capacity, resulting in a better blood leakage prevention effect. It should also be noted that the hemostatic valve 24 is made of a non-uniform elastic material. The main part that deforms after being pressed by the reinforcing pad 20 is the edge position of the hemostatic valve 24, and the position with the self-sealing seam 22 has very little deformation, which will not affect the sealing and shielding effects at the self-sealing seam 22. In addition, the subsequent insertion of the guide wire is from the side where the bowl-shaped portion 38 is concave, and it will not be unable to be inserted because the bowl-shaped portion 38 cannot rebound towards the concave side.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, terms such as "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined by the claims of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A blood leakage-proof vascular sheath structure, characterized in that: It includes a catheter sheath, a connector fixedly connected to one end of the catheter sheath, a sheath base connected to the catheter sheath through the connector, an end cap assembly detachably mounted on the end of the sheath base away from the catheter sheath, a connection base fixedly provided on one side of the sheath base, a flexible tube connected to the sheath base through the connection base, and a three-way valve connected to the end of the flexible tube away from the sheath base; A hemostatic valve is provided in the sheath base. A bowl-shaped part is formed in the center of the hemostatic valve, and a self-sealing seam is provided in the center of the bowl-shaped part. A reinforcing pad is provided between the hemostatic valve and the end cap assembly. A tapered part is formed in the center of the reinforcing pad, and the tapered part presses the hemostatic valve to keep the hemostatic valve convex toward the side where the catheter sheath is located; The end cap assembly includes a sealing cap and a control pad. The sealing cap is threadedly connected to the sheath base. The control pad is located between the sealing cap and the reinforcing pad. The control pad is used to adjust the pressing degree of the reinforcing pad on the hemostatic valve. A positioning groove is fixedly provided at one end of the sealing cap away from the catheter sheath, and a reference groove is fixedly provided on the circumferential side of the sheath base. The reference groove cooperates with the positioning groove.

2. The vascular sheath structure for preventing blood leakage according to claim 1, characterized in that: The sheath base includes a connecting part located inside the connector. A connecting cavity and a placement cavity that communicate with each other are formed inside the sheath base. The connecting cavity corresponds to the connecting part. The connecting cavity communicates with the catheter sheath. A guiding part is formed on the inner wall of the sheath base between the connecting cavity and the placement cavity. An injection hole corresponding to the connection base is provided on one inner wall of the placement cavity, and the injection hole communicates with the flexible tube. The hemostatic valve and the reinforcing pad are located in the placement cavity.

3. The vascular sheath structure for preventing blood leakage according to claim 2, wherein: A placement hole is provided in the center of the end cap assembly. A through hole is provided in the center of the reinforcing pad. A guide wire can sequentially pass through the catheter sheath, the connecting cavity, the placement cavity, the self-sealing seam, the through hole, and the placement hole.

4. A blood leakage prevention vascular sheath structure according to claim 2, characterized in that: The placement cavity is in a stepped shape. The inner diameter of the placement cavity near the sealing cap is larger than the inner diameter of the placement cavity near the catheter sheath. The hemostatic valve is embedded at the step of the placement cavity. A first limiting groove is fixedly provided on the inner wall of the placement cavity near the sealing cap. A first limiting pin is fixedly provided on the circumferential side of the reinforcing pad. The reinforcing pad is slidably connected to the sheath base, and the first limiting pin cooperates with the first limiting groove.

5. The vascular sheath structure for preventing blood leakage according to claim 2, characterized in that: An inner snap ring and an outer snap ring are fixedly provided at one end of the sealing cap near the catheter sheath. A placement groove is formed between the inner snap ring and the outer snap ring. The control pad is installed in the placement groove. A spiral groove is fixedly provided on the inner wall of the placement groove. A sliding rod is fixedly provided on the circumferential side of the reinforcing pad. The sliding rod is slidably connected to the spiral groove.

6. The vascular sheath structure for preventing blood leakage according to claim 2, characterized in that: Calibration scales are provided on the end face of the sealing cap near the catheter sheath. A positioning ring is fixedly provided at one end of the control pad near the catheter sheath. Alignment scales are provided on the positioning ring. The alignment scales cooperate with the calibration scales.

7. The vascular sheath structure for preventing blood leakage according to claim 5, wherein: The end cap assembly further includes a rotating ring and a control ring located between the reinforcing pad and the sealing cap. One end of the control pad close to the sealing cap is fixedly provided with a receiving groove, and the rotating ring is slidably connected to the receiving groove. The receiving groove is provided with a second limiting groove, and one end face of the rotating ring close to the catheter sheath is fixedly provided with a second limiting pin, and the second limiting pin is matched with the second limiting groove. A torsion spring is arranged inside the rotating ring, one end of the torsion spring is fixedly connected to the inner side wall of the rotating ring, and the other end of the torsion spring is fixedly connected to the inner clamping ring; One end of the rotating ring close to the sealing cap is fixedly provided with a mounting groove, and wedge-shaped teeth are fixedly arranged in the mounting groove. One end of the control ring away from the sealing cap is fixedly provided with limiting teeth, and the wedge-shaped teeth are matched with the limiting teeth.

8. The vascular sheath structure for preventing blood leakage according to claim 7, characterized in that: One end of the placement groove away from the catheter sheath is fixedly provided with an extension groove, the control ring is located in the extension groove, and the control ring is slidably connected to the extension groove. The extension groove is fixedly provided with a third limiting groove, and one end of the control ring away from the catheter sheath is fixedly provided with a third limiting pin, and the third limiting pin is matched with the third limiting groove.

9. The vascular sheath structure for preventing blood leakage according to claim 8, characterized in that: One end of the control ring away from the catheter sheath is provided with a control spring, one end of the control spring is fixedly connected to the control ring, and the other end of the control spring is fixedly connected to the inner wall of the extension groove; A side ring groove is arranged on the outer side of one end of the rotating ring away from the catheter sheath, and a limiting ring is fixedly arranged on the inner wall of the placement groove, and the limiting ring is rotatably connected to the side ring groove.

10. A blood leakage-proof vascular sheath structure according to claim 6, characterized in that: A friction portion is arranged on the outer side of the positioning ring, the friction portion is matched with the conical portion, and when the friction portion and the conical portion are externally squeezed, they will rotate synchronously under the action of friction force.

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