Angiography guide wire

Abstract

The utility model discloses a radiography guide wire which comprises a core wire and a spring sheath, the spring sheath is sleeved on the outer surface of the core wire, and a coating is arranged on the outer surface of the spring sheath. The radiography guide wire comprises a core wire, the core wire is arranged on the inner layer of the guide wire, the head end of the core wire is physically ground from the near end to the far end of a spring sheath, hardness is reduced, safety of the guide wire is guaranteed, the surface of the spring sheath is coated with a coating, and lubricity and trafficability of the guide wire are improved. Meanwhile, the structure is simple, and the production cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an angiography guide wire. Background Art

[0002] Coronary artery disease is a common clinical problem in the field of coronary interventional treatment. Interventional diagnosis and treatment through guidewire delivery and equipment is one of the rapidly developing treatment methods. Usually, during vascular intervention, for patients with poor vascular conditions, or when preparing for stenting or balloon expansion, the target vessel is tortuous or small, making it difficult to enter. You can first use an exchange guidewire with a catheter with good compliance to deliver it to the target vessel, then withdraw the catheter, retain the guidewire, and deliver the stent delivery device or balloon catheter along the exchange guidewire for treatment.

[0003] However, the current design of the same type of angiography guidewire cannot provide both support and smoothness when pushed into the blood vessel during clinical use, and most of the same type of guidewires are designed with a safety wire, which makes assembly difficult during production, the process is cumbersome, and the cost is high. Utility Model Content

[0004] Therefore, one purpose of the utility model is to provide an angiography guide wire to solve the problems mentioned in the background technology and overcome the deficiencies in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A radiographic guide wire comprises a core wire and a spring sheath, wherein the spring sheath is sleeved on the outer surface of the core wire and the outer surface of the spring sheath is provided with a coating.

[0007] Furthermore, the core wire includes a first core wire, a second core wire and a third core wire, and two ends of the second core wire are respectively connected to one end of the first core wire and one end of the third core wire.

[0008] Further, the diameter of the cross section of the first core wire is greater than the diameter of the cross section of the third core wire.

[0009] Furthermore, the diameter of the cross section of the second core wire gradually decreases in a direction away from the first core wire.

[0010] Furthermore, the third core wire is provided with a top bead at one end away from the second core wire.

[0011] Furthermore, the coating is made of polytetrafluoroethylene.

[0012] Furthermore, the length of the spring sheath is equal to the length of the core wire.

[0013] Furthermore, the first core wire, the second core wire and the third core wire are integrated.

[0014] Therefore, the utility model has the following beneficial effects:

[0015] The utility model is a radiographic guide wire, comprising a core wire, which is arranged in the inner layer of the guide wire, and the head end of the core wire is physically ground from the proximal end to the distal end of the spring sheath to reduce the hardness and ensure the safety of the guide wire, and the surface of the spring sheath is coated with a coating to increase the lubricity and passability of the guide wire. At the same time, the utility model has a simple structure and a low production cost.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a cross-sectional view guide wire structure schematic diagram of the utility model.

[0019] In the figure: 1, core wire; 2, spring sheath; 3, coating; 4, first core wire; 5, second core wire; 6, third core wire; 7, top bead. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1 As shown, a radiographic guide wire comprises a core wire 1 and a spring sheath 2. The spring sheath 2 is sleeved on the outer surface of the core wire 1, and a coating 3 is provided on the outer surface of the spring sheath 2.

[0023] Specifically, the coating 3 on the outer surface of the spring sheath 2 is a hydrophilic coating 3 .

[0024] Furthermore, the core wire 1 includes a first core wire 4 , a second core wire 5 and a third core wire 6 , and two ends of the second core wire 5 are connected to one end of the first core wire 4 and one end of the third core wire 6 , respectively.

[0025] Specifically, the first core wire 4 is a section of equal diameter, the second core wire 5 is a section of reduced diameter, which may also be called a transition section, and the third core wire 6 is a curved section.

[0026] As an implementation method, the core wire 1 can be made of any one or more materials selected from Ni-Ti alloy, stainless steel, cobalt-based alloy, Fe-Mn alloy, Cu-Zn alloy, Fe-Ni alloy. Preferably, the core wire is made of highly elastic Ni-Ti alloy.

[0027] The core wire 1 can be made by physical grinding, physical polishing, electrolytic polishing, chemical etching and other methods or technologies, preferably physical grinding. When the core wire 1 is a Ni-Ti alloy, the head end of the core wire 1 can be heat-set by using a cold bending die and controlling the heat treatment process.

[0028] Furthermore, the diameter of the cross section of the first core wire 4 is greater than the diameter of the cross section of the third core wire 6 .

[0029] Furthermore, the diameter of the cross section of the second core wire 5 gradually decreases in a direction away from the first core wire 4 .

[0030] As an embodiment, the diameter of the cross section of the first core wire 4 is three times the diameter of the cross section of the third core wire 6 .

[0031] As an embodiment, the diameter of the cross section of the first core wire 4 is twice the diameter of the cross section of the third core wire 6 .

[0032] That is to say, the specific mathematical relationship between the diameter of the cross section of the first core wire 4 and the diameter of the cross section of the third core wire 6 can be selectively set according to actual needs, and any mathematical relationship that makes the diameter of the cross section of the first core wire 4 larger than the diameter of the cross section of the third core wire 6 is within the protection scope of the present utility model.

[0033] Furthermore, a top bead 7 is provided at one end of the third core wire 6 away from the second core wire 5 .

[0034] As an embodiment, the top bead 7 is hemispherical in shape.

[0035] As an implementation manner, the diameter of the top bead 7 is equal to the cross-sectional diameter of the third core wire 6 .

[0036] As an implementation manner, the diameter of the top bead 7 is greater than the cross-sectional diameter of the third core wire 6 .

[0037] As an implementation manner, the diameter of the top bead 7 is three times the cross-sectional diameter of the third core wire 6 .

[0038] As a specific implementation, the cross-sectional diameter of the third core wire 6 is 1 mm-15 mm.

[0039] As a specific implementation, the contour shape of the third core wire 6 may be conical.

[0040] As a specific implementation, the contour shape of the third core wire 6 may be trapezoidal.

[0041] As a specific implementation, the contour shape of the third core wire 6 may be parabolic.

[0042] As a specific implementation, the contour shape of the third core wire 6 may be streamlined.

[0043] As a specific implementation, the overall length of the angiography guidewire is between 50 cm and 500 cm.

[0044] As a specific implementation, the length of the spring sheath 2 is between 50 cm and 500 cm.

[0045] As a specific implementation, the wire diameter of the spring coil in the spring sheath 2 is 0.001" to 0.015", and the outer diameter of the spring coil is 0.005" to 0.050".

[0046] Furthermore, the material of the coating 3 is polytetrafluoroethylene.

[0047] Polytetrafluoroethylene (PTFE) is a high molecular polymer obtained by polymerization of tetrafluoroethylene as a monomer. It has the characteristics of acid and alkali resistance, resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, its friction coefficient is extremely low. In addition, polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance. Therefore, the utility model selects polytetrafluoroethylene as the coating 3 material.

[0048] Furthermore, the length of the spring sheath 2 is equal to the length of the core wire.

[0049] Furthermore, the first core wire 4, the second core wire 5 and the third core wire 6 are integrated.

[0050] As an implementation mode, the first core wire 4, the second core wire 5 and the third core wire 6 are integrally formed.

[0051] As an implementation manner, the first core wire 4, the second core wire 5 and the third core wire 6 may also be separated.

[0052] As an implementation manner, the first core wire 4, the second core wire 5 and the third core wire 6 are connected together by welding.

[0053] As an implementation mode, the first core wire 4, the second core wire 5 and the third core wire 6 are connected together by vulcanization bonding.

[0054] In order to better understand the angiography guidewire of the utility model, the manufacturing process of the angiography guidewire of the utility model is described below. However, it should be noted that the manufacturing process of the angiography guidewire in the following embodiments is only exemplary and not exclusive. The angiography guidewire of the utility model can be manufactured by a variety of methods and techniques.

[0055] In one embodiment, a core wire is prepared by machining and grinding combined with physical grinding technology, a spring sheath is made by winding with a spring winding machine and fixed on the outer surface of the core wire, the guide wire tip is shaped by a cold shaping device, and a layer of PTFE or hydrophilic coating is attached to the surface of the guide wire by a brushing process to complete the production.

[0056] In one embodiment, a core wire is prepared by machine mold forming technology, an outer spring sheath is woven by a braiding machine and fixed on the outer surface of the core wire, the guide wire tip is shaped by a heat treatment process, and a layer of PTFE or hydrophilic coating is attached to the surface of the guide wire by a spraying process to complete the production.

[0057] In one embodiment, a core wire is prepared by machining and grinding combined with physical grinding technology, an outer spring sheath is made by winding with a spring winding machine, the guide wire tip is shaped by a cold forming tool, and a layer of PTFE or hydrophilic coating is attached to the surface of the guide wire by a dip coating process to complete the production.

[0058] The utility model provides an angiographic guide wire, which comprises a core wire, which is arranged in the inner layer of the guide wire. From the proximal end to the distal end of a spring sheath, the head end of the core wire is physically ground to reduce the hardness and ensure the safety of the guide wire. The surface of the spring sheath is coated with a coating to increase the lubricity and passability of the guide wire.

[0059] The utility model has a simple structure and a low production cost, and the guide wire performance can take into account both support and lubricity.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] It is not difficult for those skilled in the art to understand that the utility model includes any combination of the utility model content and the specific implementation method part of the above specification and the various parts shown in the drawings. Due to the limited space and to make the specification concise, the various schemes composed of these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0062] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A contrast guide wire, characterized in that: It comprises a core wire and a spring sheath, wherein the spring sheath is sleeved on the outer surface of the core wire, and the outer surface of the spring sheath is provided with a coating; The core wire includes a first core wire, a second core wire and a third core wire, and two ends of the second core wire are respectively connected to one end of the first core wire and one end of the third core wire.

2. The angiographic guide wire according to claim 1, characterized in that: A diameter of a cross section of the first core wire is greater than a diameter of a cross section of the third core wire.

3. A contrast guide wire according to claim 1 or 2, characterized in that: The diameter of the cross section of the second core wire gradually decreases in a direction away from the first core wire.

4. The angiographic guide wire according to claim 3, characterized in that: The third core wire is provided with a top bead at one end away from the second core wire.

5. The angiographic guide wire according to claim 1, characterized in that: The material of the coating is polytetrafluoroethylene.

6. The angiographic guide wire according to claim 1, characterized in that: The length of the spring sheath is equal to the length of the core wire.

7. The angiographic guide wire according to claim 1 or 2, characterized in that: The first core wire, the second core wire and the third core wire are integral.

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