Catheter with hardness smoothly and gradually changed

Abstract

The utility model relates to the technical field of catheters, and discloses a catheter with smoothly and gradually changed hardness, which comprises a base tube, the base tube comprises a catheter body I, a catheter body II and a connecting sleeve, the catheter body II is arranged at one side end of the catheter body through the connecting sleeve, and the catheter body I comprises a base tube, a lining I, a reinforcing wire I and a sheath I; the first lining is mounted on the outer wall of the base tube, the first reinforcing wire is mounted on the outer wall of the base tube, the first sheath is mounted on the outer wall of the first reinforcing wire, the second catheter body comprises a base tube, a second lining, a second reinforcing wire and a second sheath, the second lining is mounted on the outer wall of the base tube, the second reinforcing wire is mounted on the outer wall of the base tube, and the second sheath is mounted on the outer wall of the second reinforcing wire. According to the catheter with the hardness gradually changed smoothly, the first catheter body and the second catheter body with the hardness gradually reduced are arranged, so that the catheter bodies are not prone to bending or radial deformation in the using process, and the catheter can pass through tortuous blood vessels without damaging biological lumens.

Description

Technical Field

[0001] The utility model relates to the technical field of catheters, in particular to a catheter with a smooth and gradual hardness change. Background Art

[0002] The catheter is a key device in the field of interventional therapy. Its function is usually to be inserted into biological lumens such as blood vessels and pass through these biological lumens to reach the location of the lesion that needs to be treated or diagnosed.

[0003] Based on the mode of action of the catheter, it must meet the delivery performance requirements in the biological lumen and cannot cause damage to the biological lumen during the delivery process. Once the catheter is bent or radially deformed during the delivery process, it will affect the transmission of the catheter's own force, thereby affecting the delivery performance. If the catheter's lumen becomes smaller or the inner diameter of some areas becomes narrower, it will also affect the delivery of other instruments inside it. If the catheter is used to aspirate thrombus, the smaller lumen will also affect the efficiency of aspirating thrombus, so the existing device needs to be improved to meet actual needs. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a catheter with a smooth and gradual hardness change, which has the advantages of good catheter delivery performance and solves the above-mentioned technical problems.

[0006] (II) Technical solution

[0007] To achieve the above object, the utility model provides the following technical solution: a catheter with a smooth and gradual hardness change, comprising a catheter body, wherein the catheter body comprises a catheter body 1, a catheter body 2 and a connecting sleeve, wherein the catheter body 2 is installed at one side end of the catheter body through the connecting sleeve;

[0008] The catheter body 1 comprises a base tube, an inner liner 1, a reinforcing wire 1 and a sheath 1, wherein the inner liner 1 is installed on the outer wall of the base tube, and the outer wall is installed with a reinforcing wire 1, and the sheath 1 is installed on the outer wall of the reinforcing wire 1;

[0009] The second catheter body comprises a base tube, a second inner liner, a second reinforcing wire and a second sheath. The second inner liner is installed on the outer wall of the base tube, and the outer wall is installed with a second reinforcing wire. The second sheath is installed on the outer wall of the second reinforcing wire.

[0010] Preferably, the hardness of the catheter body 1 and the catheter body 2 decreases sequentially.

[0011] Through the above technical solution, the hardness of the catheter body 1 and the catheter body 2 decreases successively, achieving an effect of smooth and gradual hardness change.

[0012] Preferably, the connecting sleeve connects the catheter body 1 and the catheter body 2 by heat welding.

[0013] Through the above technical solution, the thickness of the outer walls of both ends of the catheter body 1 and the catheter body 2 is reduced, which makes it easier to connect the catheter body 1 and the catheter body 2 using a connecting sleeve.

[0014] Preferably, the materials of the lining one and the lining two are both polymer materials.

[0015] Through the above technical solution, the material of the lining one is polytetrafluoroethylene with high hardness, and the material of the lining two is polyolefin.

[0016] Preferably, the reinforcing wire one and the reinforcing wire two are braided structures made of nickel-titanium wires.

[0017] Through the above technical solution, the winding density of the reinforcing wire one is greater than that of the reinforcing wire two.

[0018] Preferably, the material of the sheath one is polyamide, and the material of the sheath two is polyurethane.

[0019] Through the above technical solution, the hardness of sheath one and sheath two decreases successively, and sheath one and sheath two of different hardness can further optimize the mechanical properties of the catheter body.

[0020] Compared with the prior art, the utility model provides a catheter with a smooth and gradual hardness change, which has the following beneficial effects:

[0021] 1. The utility model uses a connecting sleeve to heat-weld the catheter body 1 and the catheter body 2 together, thereby increasing the connectivity of the catheter body. The axial splicing structure of the catheter body 1 and the catheter body 2 improves the mechanical properties of the catheter body, meets the positioning ability of the catheter body, and makes the catheter body not easy to bend or radially deform during use, and can pass through tortuous blood vessels without causing damage to the biological lumen.

[0022] 2. The utility model provides reinforcing wires 1 and 2 with different winding densities so that the catheter body has different hardnesses along the axial direction. The portion with low hardness combined with the soft distal end facilitates the catheter body to be inserted into the narrow vascular lesion site without damaging the blood vessel, and is easy to advance in the curved blood vessel. The portion with greater hardness has good mechanical support and can withstand a certain force when encountering obstacles, ensuring that it withstands a greater pushing force. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a catheter with a smooth and gradual change in hardness structure of the utility model;

[0024] Figure 2 It is a schematic cross-sectional view of a side view of the catheter body in the structure of the utility model;

[0025] Figure 3It is a schematic cross-sectional view of two side views of the catheter body in the structure of the utility model.

[0026] Among them: 1. catheter body; 11. catheter body one; 12. catheter body two; 13. connecting sleeve; 2. base pipe; 112. lining one; 113. reinforcing wire one; 114. sheath one; 122. lining two; 123. reinforcing wire two; 124. sheath two. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-3 A catheter with a smooth and gradual hardness change comprises a catheter body 1, wherein the catheter body 1 comprises a catheter body 11, a catheter body 2 12 and a connecting sleeve 13, wherein the catheter body 2 12 is installed at the side end of the catheter body 11 through the connecting sleeve 13;

[0029] The catheter body 11 includes a base tube 2, an inner liner 112, a reinforcing wire 113 and a sheath 114. The inner liner 112 is installed on the outer wall of the base tube 2, and the outer wall is installed with a reinforcing wire 113. The sheath 114 is installed on the outer wall of the reinforcing wire 113.

[0030] The catheter body 12 includes a base tube 2, an inner liner 122, a reinforcing wire 123 and a sheath 124. The inner liner 122 is installed on the outer wall of the base tube 2, and the outer wall is installed with the reinforcing wire 123. The sheath 124 is installed on the outer wall of the reinforcing wire 123.

[0031] Specifically, the hardness of the catheter body 11 and the catheter body 2 12 decreases sequentially, and the advantage is that the hardness of the catheter body 11 and the catheter body 2 12 decreases sequentially, achieving a smooth and gradual hardness change effect.

[0032] Specifically, the connecting sleeve 13 connects the catheter body 11 and the catheter body 2 12 by heat welding. The advantage is that the outer wall thickness of the catheter body 11 and the catheter body 2 12 at both ends is reduced, which makes it easier to connect the catheter body 11 and the catheter body 2 12 using the connecting sleeve 13.

[0033] Specifically, the materials of the liner 1 112 and the liner 2 122 are both polymer materials, with the advantage that the material of the liner 1 112 is polytetrafluoroethylene with high hardness, and the material of the liner 2 122 is polyolefin.

[0034] Specifically, the reinforcing wire 1 113 and the reinforcing wire 2 123 are braided structures made of nickel-titanium wires. The advantage is that the winding density of the reinforcing wire 1 113 is greater than that of the reinforcing wire 2 123 .

[0035] Specifically, the material of sheath 1 114 is polyamide, and the material of sheath 2 124 is polyurethane. The advantage is that the hardness of sheath 1 114 and sheath 2 124 decreases successively, and sheath 1 114 and sheath 2 124 with different hardness can further optimize the mechanical properties of the catheter body 1.

[0036] When in use, the catheter body 11 and the catheter body 2 12 are connected together by heat welding using the connecting sleeve 13 to increase the connectivity of the catheter body 1. The axial splicing structure of the catheter body 11 and the catheter body 2 12 improves the mechanical properties of the catheter body 1 and satisfies the positioning ability of the catheter body 1, so that the catheter body 1 is not easy to bend or radially deform during use, and can pass through tortuous blood vessels without causing damage to the biological lumen. By setting the reinforcing wire 113 and the reinforcing wire 2 123 with different winding densities, the catheter body 1 has different hardnesses along the axial direction. The part with low hardness combined with the soft distal end makes it easy for the catheter body 1 to extend into the narrow vascular lesion site without damaging the blood vessel, and is easy to advance in the curved blood vessel. The part with higher hardness has good mechanical support and can withstand a certain force when encountering obstacles, ensuring that it withstands a larger pushing force.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A catheter with a smooth and gradual hardness change, comprising a catheter body (1), characterized in that: The catheter body (1) comprises a catheter body 1 (11), a catheter body 2 (12) and a connecting sleeve (13), wherein the catheter body 2 (12) is installed on the side end of the catheter body 1 (11) via the connecting sleeve (13); The catheter body (11) comprises a base tube (2), an inner liner (112), a reinforcing wire (113) and a sheath (114); the inner liner (112) is mounted on the outer wall of the base tube (2), and the outer wall is mounted with a reinforcing wire (113); the sheath (114) is mounted on the outer wall of the reinforcing wire (113); The catheter body 2 (12) comprises a base tube (2), an inner liner 2 (122), a reinforcing wire 2 (123) and a sheath 2 (124); the inner liner 2 (122) is installed on the outer wall of the base tube (2), and the outer wall is installed with a reinforcing wire 2 (123); the sheath 2 (124) is installed on the outer wall of the reinforcing wire 2 (123).

2. A catheter with a smooth and gradual hardness change according to claim 1, characterized in that: The hardness of the catheter body 1 (11) and the catheter body 2 (12) decreases successively.

3. The catheter with a smooth and gradual hardness change according to claim 1, characterized in that: The connecting sleeve (13) connects the catheter body 1 (11) and the catheter body 2 (12) by means of heat welding.

4. The catheter with a smooth and gradual hardness change according to claim 1, characterized in that: The materials of the inner lining 1 (112) and the inner lining 2 (122) are both polymer materials.

5. The catheter with a smooth and gradual hardness change according to claim 1, characterized in that: The reinforcing wire one (113) and the reinforcing wire two (123) are braided structures made of nickel-titanium wires.

6. The catheter with a smooth and gradual hardness change according to claim 1, characterized in that: The material of the first sheath (114) is polyamide, and the material of the second sheath (124) is polyurethane.

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