Catheter sheath

Abstract

The catheter sheath comprises a sheath tube body, an expansion tube and a hemostasis assembly, the sheath tube body comprises a hemostasis section, a penetrating-in end and a penetrating-out end, the expansion tube and the penetrating-out end are fixedly connected and communicated, the hemostasis section and the penetrating-in end are adjacently arranged, and the hemostasis assembly is arranged on the hemostasis section; the hemostasis assembly comprises an elastic sealing gasket arranged in the hemostasis section, the elastic sealing gasket is provided with a through hole allowing the catheter to penetrate through, the inner wall of the elastic sealing gasket is attached to the outer wall of the catheter, and the elastic force direction of the elastic sealing gasket faces the axis of the sheath tube body. The hemostasis assembly further comprises an adjusting assembly used for adjusting the diameter of the through hole. The catheter sheath is reasonable in structure, the elastic sealing gasket of the hemostasis assembly can be adjusted according to the diameter of the corresponding catheter, the good hemostasis effect can be achieved, and the situation that the frictional resistance between the hemostasis assembly and the catheter is too large, and the operation hand feeling is affected is avoided.

Description

Technical Field

[0001] The utility model relates to a catheter sheath. Background Art

[0002] As an auxiliary guide device for arteriovenous interventional surgery, the catheter sheath plays an important role in interventional treatment. Through vascular puncture technology, the catheter sheath uses a puncture guidewire to guide the catheter sheath to expand the skin muscle tissue into the epidermal blood vessel lumen, and then removes the puncture guidewire and dilation tube assembly, so that the distal end of the catheter sheath is placed in the blood vessel, thus establishing a channel from the outside of the body to the lumen of the blood vessel, which can be used for other devices or drugs to enter the blood vessel or for hemodynamic monitoring, etc.

[0003] In interventional surgery, the use of a catheter sheath can effectively reduce damage to blood vessels and prevent blood loss. The hemostatic valve in the existing catheter sheath cannot be adjusted accordingly to the diameter of the catheter passing through it. If the diameter of the catheter is too small, it cannot be effectively sealed, which can easily lead to blood seeping from the outer wall of the catheter and the hemostatic valve, and cannot achieve a good hemostatic effect; if the diameter of the catheter is too large, the friction resistance of the hemostatic valve to the catheter is too large, which seriously affects the operating performance and reduces the doctor's operating feel.

[0004] Therefore, it is necessary to improve the catheter sheath in the prior art. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects existing in the prior art and to provide a catheter sheath. The elastic sealing pad of the hemostatic component can be adjusted according to the diameter of the corresponding catheter, which can achieve a good hemostatic effect without making the friction resistance between the hemostatic component and the catheter too large, thereby affecting the operating feel.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: a catheter sheath, comprising a sheath body, an expansion tube and a hemostatic component, the sheath body comprising a hemostatic segment, an insertion end and an exit end, the expansion tube is fixedly connected to the exit end and is arranged in communication, the hemostatic segment is arranged adjacent to the insertion end, and the hemostatic component is arranged on the hemostatic segment;

[0007] The hemostasis assembly comprises an elastic sealing pad arranged in the hemostasis segment, one end of the elastic sealing pad is fixed and sealed to the inner wall of the hemostasis segment, the elastic sealing pad is provided with a through hole for the catheter to pass through, the inner wall of the elastic sealing pad is arranged in contact with the outer wall of the catheter, and the elastic force direction of the elastic sealing pad is toward the axis of the sheath body;

[0008] The hemostasis component further includes an adjusting component for adjusting the diameter of the through hole.

[0009] A preferred technical solution is that the hemostasis component includes a base plate fixedly connected to the elastic sealing pad, the base plate is provided with at least three base plates along the outer circumference of the elastic sealing pad, and the fixed end of the base plate is fixedly connected to the inner wall of the hemostasis segment; the adjustment component includes an external expansion component for expanding the diameter of the through hole.

[0010] A preferred technical solution is that the outward expansion component includes an elastic member arranged between the inner wall of the hemostasis segment and the free end of the substrate, the elastic force direction of the elastic member is arranged opposite to the elastic force direction of the elastic sealing pad, and the elastic force of the elastic member is greater than the elastic force of the elastic sealing pad.

[0011] A preferred technical solution is that the elastic member comprises a tension spring, and two ends of the tension spring are respectively fixedly connected to the inner wall of the hemostasis section and the free end of the base plate.

[0012] A preferred technical solution is that the adjustment component also includes a retraction component for reducing the diameter of the through hole.

[0013] A preferred technical solution is that the retraction component includes an abutment plate protruding from the outside of the base plate, a retraction column abutting against the abutment plate and driving the free end of the base plate to move toward the axial direction of the sheath body, and the hemostasis section is provided with a through hole for the abutment plate to pass through; the retraction column is provided with an abutment inner wall, and the diameter of the abutment inner wall is gradually expanded along the insertion direction of the catheter.

[0014] A preferred technical solution is that a locking assembly for locking the retracted column in at least two working positions is provided between the retracted column and the hemostasis section.

[0015] A preferred technical solution is that the locking assembly includes an internal thread and an external thread which are arranged on the inner wall of the retracted column and the outer wall of the hemostasis segment and are threadably connected to each other.

[0016] A preferred technical solution is that the abutting end of the abutting plate is arranged in an arc shape.

[0017] The advantages and beneficial effects of the utility model are as follows: the catheter sheath of the utility model has a reasonable structure, and adaptability to catheters of different diameters is achieved by arranging an elastic sealing pad and adjusting the diameter of the through hole of the elastic sealing pad. The elastic sealing pad is in an elastic expansion state, which can ensure that the elastic sealing pad fits the outer wall of the catheter and stops bleeding. Therefore, the adaptability of the catheter is met, and a good hemostatic effect can be achieved without making the friction resistance between the hemostatic component and the catheter too large, thereby affecting the operating feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a catheter sheath of the utility model;

[0019] Figure 2 yes Figure 1 Explosion diagram of

[0020] Figure 3 yes Figure 1 A cross-sectional view of

[0021] Figure 4 yes Figure 2 A cross-sectional view of

[0022] Figure 5 It is a cross-sectional view of the hemostatic segment;

[0023] Figure 6 is a schematic diagram of the structure of the hemostasis component;

[0024] In the figure: 1. sheath body; 11. hemostasis section; 12. insertion end; 13. exit end; 14. perforation; 2. expansion tube; 3. elastic sealing pad; 31. through hole; 4. base plate; 41. abutment plate; 5. tension spring; 6. retracted column; 61. abutment inner wall. DETAILED DESCRIPTION

[0025] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", "vertical", "top", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] Example

[0028] like Figure 1-6As shown, the catheter sheath of the embodiment includes a sheath body 1, an extension tube 2 and a hemostasis component, the sheath body 1 includes a hemostasis segment 11, an insertion end 12 and an exit end 13, the extension tube 2 is fixedly connected to the exit end 13 and arranged in communication, the hemostasis segment 11 is arranged adjacent to the insertion end 12, and the hemostasis component is arranged on the hemostasis segment 11; the hemostasis component includes an elastic sealing pad 3 arranged in the hemostasis segment 11, one end of the elastic sealing pad 3 is fixed and sealed to the inner wall of the hemostasis segment 11, the elastic sealing pad 3 is provided with a through hole 31 for the catheter to pass through, the inner wall of the elastic sealing pad 3 is arranged in contact with the outer wall of the catheter, and the elastic force direction of the elastic sealing pad 3 is toward the axial line of the sheath body 1; the hemostasis component also includes an adjustment component for adjusting the diameter of the through hole 31.

[0029] Through such a design, one end of the elastic sealing pad 3 is fixedly connected to the inner wall of the hemostatic section 11, and the other end can adjust the diameter of the through hole 31. The elastic sealing pad 3 always has an inward elastic force, so that the elastic sealing pad 3 fits and seals with the outer wall of the catheter to achieve a hemostatic effect.

[0030] Specifically, the hemostasis component includes a base plate 4 fixedly connected to the elastic sealing pad 3, and at least three base plates 4 are arranged along the outer periphery of the elastic sealing pad 3, and the fixed end of the base plate 4 is fixedly connected to the inner wall of the hemostasis segment 11; the adjustment component includes an external expansion component for expanding the diameter of the through hole 31.

[0031] With such a design, the outward expansion component can offset part of the inward elastic force of the elastic sealing pad 3, avoiding the elastic sealing pad 3 and the catheter from fitting too tightly, which would cause difficulty for the operator to operate; the outward expansion component can also expand the diameter of the through hole 31 to meet the needs of large diameter catheters.

[0032] Specifically, the outward expansion component includes an elastic member arranged between the inner wall of the hemostasis segment 11 and the free end of the substrate 4, the elastic force direction of the elastic member is arranged opposite to the elastic force direction of the elastic sealing pad 3, and the elastic force of the elastic member is greater than the elastic force of the elastic sealing pad 3.

[0033] Through such a design, the substrate 4 has a certain deformation ability, and the elastic member can move the free end of the substrate 4 closer to the inner wall of the hemostasis section 11 , thereby achieving the purpose of expanding the diameter of the through hole 31 .

[0034] Specifically, the elastic member includes a tension spring 5 , and two ends of the tension spring 5 are fixedly connected to the inner wall of the hemostasis section 11 and the free end of the base plate 4 respectively.

[0035] Such a design is a further limitation of the above scheme.

[0036] Specifically, the adjustment component further includes a retracting component for reducing the diameter of the through hole 31 .

[0037] With such a design, the diameter of the through hole 31 can be reduced and the inner wall of the elastic sealing pad 3 can be closely fitted and sealed with the outer wall of the conduit.

[0038] Specifically, the retraction component includes an abutment plate 41 protruding from the outside of the base plate 4, a retraction column 6 abutting against the abutment plate 41 and driving the free end of the base plate 4 to move toward the axial direction of the sheath body 1, and the hemostasis section 11 is provided with a through hole 14 for the abutment plate 41 to pass through; the retraction column 6 is provided with an abutment inner wall 61, and the diameter of the abutment inner wall 61 is gradually expanded along the insertion direction of the catheter.

[0039] With such a design, as the retracted column 6 moves in the puncture direction, the abutting inner wall 61 fits with the abutting plate 41 and the free end of the driving substrate 4 retracts, thereby causing the elastic sealing pad 3 to retract and fit with the outer wall of the catheter.

[0040] Specifically, a locking assembly for locking the retracted column 6 in at least two working positions is provided between the retracted column 6 and the hemostasis section 11 .

[0041] Through such a design, the versatility of the hemostasis component is ensured.

[0042] Specifically, the locking assembly includes an internal thread and an external thread which are arranged on the inner wall of the retracted column 6 and the outer wall of the hemostasis segment 11 and are threadably connected to each other.

[0043] Such a design is a further limitation of the above scheme.

[0044] Specifically, the abutting end of the abutting plate 41 is arranged in an arc shape.

[0045] Through such a design, the friction resistance between the abutting plate 41 and the abutting inner wall 61 can be reduced to a certain extent.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A catheter sheath, characterized in that: The invention comprises a sheath body (1), an extension tube (2) and a hemostasis assembly, wherein the sheath body (1) comprises a hemostasis section (11), an insertion end (12) and an exit end (13), the extension tube (2) and the exit end (13) are fixedly connected and arranged in communication with each other, the hemostasis section (11) and the insertion end (12) are arranged adjacent to each other, and the hemostasis assembly is arranged on the hemostasis section (11); The hemostasis component comprises an elastic sealing pad (3) arranged in the hemostasis section (11), one end of the elastic sealing pad (3) is fixed and sealed to the inner wall of the hemostasis section (11), the elastic sealing pad (3) is provided with a through hole (31) for the catheter to pass through, the inner wall of the elastic sealing pad (3) is arranged to fit the outer wall of the catheter, and the elastic force direction of the elastic sealing pad (3) is toward the axis of the sheath body (1); The hemostasis component also includes an adjustment component for adjusting the diameter of the through hole (31).

2. The catheter sheath according to claim 1, characterized in that The hemostasis component comprises a base plate (4) fixedly connected to the elastic sealing pad (3), at least three base plates (4) are arranged along the outer circumference of the elastic sealing pad (3), and the fixed end of the base plate (4) is fixedly connected to the inner wall of the hemostasis section (11); the adjustment component comprises an external expansion component for expanding the diameter of the through hole (31).

3. The catheter sheath according to claim 2, characterized in that: The outward expansion component comprises an elastic member arranged between the inner wall of the hemostasis section (11) and the free end of the base plate (4), the elastic force direction of the elastic member being arranged opposite to the elastic force direction of the elastic sealing pad (3), and the elastic force of the elastic member being greater than the elastic force of the elastic sealing pad (3).

4. The catheter sheath according to claim 3, characterized in that: The elastic member comprises a tension spring (5), and two ends of the tension spring (5) are respectively fixedly connected to the inner wall of the hemostasis section (11) and the free end of the base plate (4).

5. The catheter sheath according to claim 2, characterized in that: The adjustment component also includes a retracting component for reducing the diameter of the through hole (31).

6. The catheter sheath according to claim 5, characterized in that: The retracting component comprises an abutment plate (41) protruding from the outside of the base plate (4), and a retracting column (6) abutting against the abutment plate (41) and driving the free end of the base plate (4) to move toward the axial center line direction of the sheath body (1); the hemostasis section (11) is provided with a through hole (14) for the abutment plate (41) to pass through; the retracting column (6) is provided with an abutment inner wall (61), and the diameter of the abutment inner wall (61) is gradually enlarged along the insertion direction of the catheter.

7. The catheter sheath according to claim 6, characterized in that: A locking assembly for locking the retracted column (6) in at least two working positions is provided between the retracted column (6) and the hemostasis section (11).

8. The catheter sheath according to claim 7, characterized in that: The locking assembly comprises an internal thread and an external thread which are arranged on the inner wall of the retracted column (6) and the outer wall of the hemostasis section (11) and are threadably connected to each other.

9. The catheter sheath according to claim 8, characterized in that: The abutting end of the abutting plate (41) is arranged in an arc shape.

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