Medical guide wire

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a medical guide wire, which comprises a core wire, an outer sleeve and an inner sleeve, the core wire comprises a rod body and a rod end, the rod body is connected with the rod end, the sleeve comprises a first section and a second section, the second section is coated on the rod body, the inner sleeve is sleeved on the rod end, and the inner sleeve is sleeved on the rod end. The first section wraps the inner sleeve, one end, close to the second section, of the first section is connected with the second section, tungsten powder is contained in the first section, and the inner sleeve is made of tungsten. Compared with the prior art, the medical guide wire has the advantages that a developing structure at the end of the medical guide wire is added, and the developing effect of the medical guide wire in a human body is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a medical guide wire. Background Art

[0002] The guidewire is one of the basic instruments for coronary intervention. It has the functions of entering the coronary artery or crossing the tortuosity, calcification, stenosis, and collateral circulation to reach the target, and establishing a track to deliver balloons, stents, and microcatheters.

[0003] An existing guide wire includes a core wire and a sleeve. The core wire includes a rod body and a rod end. The sleeve is sleeved on the core wire. The portion of the sleeve covering the rod end of the core wire has a certain amount of tungsten powder. The tungsten powder is a developable material used to help the guide wire develop in the human body so that the operator can know the specific position of the guide wire.

[0004] However, the imaging effect of existing guide wires in clinical use is not ideal, and the imaging effect in the human body is poor. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a medical guide wire in view of the problem that the imaging effect of the existing guide wire in clinical use is not ideal.

[0006] In order to solve the above technical problems, an embodiment of the utility model provides a medical guide wire, including a core wire, an outer sleeve and an inner sleeve, the core wire includes a rod body and a rod end, the rod body is connected to the rod end, the sleeve includes a first section and a second section, the second section is coated on the rod body, the inner sleeve is coated on the rod end, the first section is coated on the inner sleeve, one end of the first section close to the second section is connected to the second section, the interior of the first section contains tungsten powder, and the inner sleeve is made of tungsten.

[0007] Optionally, the first section is a hose structure, and the inner sleeve is elastic.

[0008] Optionally, the inner sleeve is a tungsten spring, the tungsten spring is sleeved on the rod end, the inner periphery of the tungsten spring is in contact with the outer periphery of the rod end, and the first section is coated on the tungsten spring.

[0009] Optionally, the length of the tungsten spring is greater than half the length of the rod end.

[0010] Optionally, the inner periphery of the tungsten spring is welded to the outer periphery of the rod end.

[0011] Optionally, a hydrophilic coating is coated on the outer periphery of the first section.

[0012] Optionally, the first section includes a covering portion and a first connecting portion, the covering portion covers the tungsten spring, the first connecting portion covers an end of the rod end close to the rod body, and an end of the first connecting portion away from the covering portion is connected to the second section.

[0013] Optionally, an end of the first connection portion away from the covering portion has an inserting area, an end of the second section close to the covering portion is provided with an inserting hole, and the inserting area is inserted into the inserting hole.

[0014] Optionally, a cross-sectional dimension of the insertion area in a direction perpendicular to the axial direction of the core wire is smaller than a cross-sectional dimension of the covering portion in a direction perpendicular to the axial direction of the core wire.

[0015] Optionally, the plug-in area is formed by the first section through a heat shrink process.

[0016] According to the medical guide wire of the embodiment of the utility model, the inner sleeve is made of tungsten, and the inner sleeve is arranged between the core wire and the outer sleeve. Compared with the prior art, a developing structure is added to the end of the medical guide wire, thereby increasing the developing effect of the medical guide wire in the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a medical guide wire provided in one embodiment of the utility model.

[0018] The figure numbers in the specification are as follows: 1, core wire; 2, rod body; 3, rod end; 4, outer sleeve; 5, first section; 6, covering part; 7, first connecting part; 8, plug-in area; 9, second section; 10, plug-in hole; 11, inner sleeve; 12, tungsten spring. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] like Figure 1 As shown, an embodiment of the utility model provides a medical guide wire, including a core wire 1, an outer sleeve 4 and an inner sleeve 11, the core wire 1 includes a rod body 2 and a rod end 3, the rod body 2 is connected to the rod end 3, the sleeve includes a first section 5 and a second section 9, the second section 9 is coated on the rod body 2, the inner sleeve 11 is sleeved on the rod end 3, the first section 5 is coated on the inner sleeve 11, one end of the first section 5 close to the second section 9 is connected to the second section 9, the interior of the first section 5 contains tungsten powder, and the inner sleeve 11 is made of tungsten.

[0021] In one embodiment, the first section 5 is a hose structure, and the inner sleeve 11 is elastic.

[0022] In this embodiment, the first section 5 is a TPU tube, the second section 9 is a PTFE tube, the outer periphery of the second section 9 is coated with a hydrophobic layer, the TPU tube is a hose, which can increase the softness of the first section 5, and the inner sleeve 11 is elastic and easy to deform, so as to facilitate guiding the medical guide wire to move in the human body.

[0023] In one embodiment, the inner sleeve 11 is a tungsten spring 12 , the tungsten spring 12 is sleeved on the rod end 3 , the inner periphery of the tungsten spring 12 contacts the outer periphery of the rod end 3 , and the first section 5 is covered on the tungsten spring 12 .

[0024] In this embodiment, the inner periphery of the tungsten spring 12 contacts the outer periphery of the rod end 3, and the first section 5 is coated on the tungsten spring 12. Specifically, the first section 5 is coated on the tungsten spring 12 by heat shrinking. The fluid generated on the first section 5 during the heat shrinking process can also fill the gap in the tungsten spring 12, thereby improving the connection strength between the tungsten spring 12, the outer sleeve 4 and the inner sleeve 11.

[0025] In one embodiment, the length of the tungsten spring 12 is greater than half the length of the rod end 3 .

[0026] The length of the tungsten spring 12 is greater than half of the length of the rod end 3 , so that the space of the rod end 3 can be fully utilized to increase the developing structure of the medical guide wire.

[0027] In one embodiment, the inner periphery of the tungsten spring 12 is welded to the outer periphery of the rod end 3 .

[0028] The inner periphery of the tungsten spring 12 is fixed to the outer periphery of the rod end 3 by welding, which can improve the connection strength between the tungsten spring 12 and the rod end 3. In other embodiments, the tungsten spring 12 can also be interference fitted on the outer periphery of the rod end 3.

[0029] In one embodiment, a hydrophilic coating is coated on the outer periphery of the first section 5, which can increase the hydrophilicity of the outer periphery of the first section 5 and reduce the friction between the outer sleeve 4 and the human body.

[0030] In one embodiment, the first section 5 includes a covering portion 6 and a first connecting portion 7, the covering portion 6 covers the tungsten spring 12, the first connecting portion 7 covers an end of the rod end 3 close to the rod body 2, and the end of the first connecting portion 7 away from the covering portion 6 is connected to the second section 9.

[0031] The covering portion 6 of the first section 5 is sleeved on the tungsten spring 12 , and the first connecting portion 7 is sleeved on one end of the rod end 3 close to the rod body 2 . The first connecting portion 7 is connected to the second section 9 , and can connect the first section 5 with the second section 9 , thereby increasing the structural stability of the first section 5 .

[0032] In one embodiment, the first connection portion 7 has an inserting area 8 at one end away from the covering portion 6 , and the second section 9 has an inserting hole 10 at one end close to the covering portion 6 , and the inserting area 8 is inserted into the inserting hole 10 .

[0033] The inner periphery of the inserting area 8 is sleeved on the outer periphery of the rod end 3, and the inserting area 8 is inserted into the inserting hole 10. The outer periphery of the inserting area 8 contacts the hole wall of the inserting hole 10, and the connection is convenient.

[0034] In one embodiment, the cross-sectional dimension of the insertion area 8 in a direction perpendicular to the axial direction of the core wire 1 is smaller than the cross-sectional dimension of the covering portion 6 in a direction perpendicular to the axial direction of the core wire 1 .

[0035] The outer sleeve 4 is circular, the diameter of the insertion area 8 is smaller than the diameter of the covering portion 6 , the insertion area 8 is inserted into the insertion hole 10 , and the outer periphery of the first connecting portion 7 is flush with the outer periphery of the second section 9 , which can increase the overall smoothness of the outer sleeve 4 .

[0036] In one embodiment, the insertion area 8 is formed by the first section 5 through a heat shrink process.

[0037] In this embodiment, the first section 5 is coated on the rod end 3 by a heat shrinking process, and the plug-in area 8 is deformed by the first section 5 during heat shrinkage, which is easy to manufacture and simple to operate.

[0038] During installation of the medical guide wire of the utility model embodiment, the second section 9 is coated on the shaft 2 of the core wire 1 by a heat shrinking process, the tungsten spring 12 is sleeved on the rod end 3, and the inner periphery of the tungsten spring 12 and the outer periphery of the rod end 3 are welded and fixed, and then the first section 5 is coated on the tungsten spring 12 and the rod end 3 by a heat shrinking process, and the rear end of the first connecting portion 7 is heat shrunk and deformed to form an insertion area 8 which fills the gap between the outer sleeve 4 and the shaft 2.

[0039] According to the medical guide wire of the embodiment of the utility model, the inner sleeve 11 is made of tungsten, and the inner sleeve 11 is arranged between the core wire 1 and the outer sleeve 4. Compared with the prior art, the developing structure of the end of the medical guide wire is added, which increases the developing effect of the medical guide wire in the human body.

[0040] In other embodiments, the first section 5 is interference-fitted on the tungsten spring 12, and the insertion area 8 is formed by grinding.

[0041] In other embodiments, the tungsten spring 12 is interference fit on the rod end 3 .

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A medical guide wire, characterized in that: The invention comprises a core wire (1), an outer sleeve (4) and an inner sleeve (11), wherein the core wire (1) comprises a rod body (2) and a rod end (3), wherein the rod body (2) is connected to the rod end (3), the sleeve comprises a first section (5) and a second section (9), wherein the second section (9) is wrapped around the rod body (2), the inner sleeve (11) is sleeved on the rod end (3), the first section (5) is wrapped around the inner sleeve (11), one end of the first section (5) close to the second section (9) is connected to the second section (9), the first section (5) contains tungsten powder inside, and the inner sleeve (11) is made of tungsten.

2. The medical guide wire according to claim 1, characterized in that: The first section (5) is a hose structure, and the inner sleeve (11) is elastic.

3. The medical guide wire according to claim 2, characterized in that: The inner sleeve (11) is a tungsten spring (12), the tungsten spring (12) is sleeved on the rod end (3), the inner periphery of the tungsten spring (12) is in contact with the outer periphery of the rod end (3), and the first section (5) is covered on the tungsten spring (12).

4. The medical guide wire according to claim 3, characterized in that: The length of the tungsten spring (12) is greater than half the length of the rod end (3).

5. The medical guide wire according to claim 3, characterized in that: The inner periphery of the tungsten spring (12) is welded to the outer periphery of the rod end (3).

6. The medical guide wire according to claim 3, characterized in that: The outer periphery of the first section (5) is coated with a hydrophilic coating.

7. The medical guide wire according to claim 3, characterized in that: The first section (5) comprises a covering portion (6) and a first connecting portion (7), wherein the covering portion (6) covers the tungsten spring (12), the first connecting portion (7) covers an end of the rod end (3) close to the rod body (2), and an end of the first connecting portion (7) away from the covering portion (6) is connected to the second section (9).

8. The medical guide wire according to claim 7, characterized in that: The first connecting portion (7) has an inserting area (8) at one end away from the covering portion (6), and the second section (9) has an inserting hole (10) at one end close to the covering portion (6), and the inserting area (8) is inserted into the inserting hole (10).

9. The medical guide wire according to claim 8, characterized in that: The cross-sectional dimension of the insertion area (8) in a direction perpendicular to the axial direction of the core wire (1) is smaller than the cross-sectional dimension of the covering portion (6) in a direction perpendicular to the axial direction of the core wire (1).

10. The medical guide wire according to claim 9, characterized in that: The plug-in area (8) is formed by the first section (5) through a heat shrink process.

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