Magnetic performance guide wire

Abstract

The utility model relates to a kind of magnetic performance guide wire, including the core wire, magnet assembly and elastic component being set in the sheath inside;The core wire includes first section, transition cone section and second section connected in turn;The inside diameter of the elastic component is greater than the diameter of the second section of the core wire;The magnet assembly includes at least 2 magnetic monomers, the magnetic monomers are placed in the second section side of the core wire with mutual contact;The elastic component is sleeved on the core wire, one end of the elastic component is fixedly connected to the core wire, and the other end of the elastic component is attached to the magnet assembly.The magnetic performance guide wire of the utility model can avoid the phenomenon that the gap between magnets is caused to weaken the magnetic performance and the gap is again stressed to bend and break.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a magnetic guide wire. Background Technology

[0002] Peripherally inserted central catheters (PICCs) offer advantages such as high safety, long indwelling time, and ease of operation, and are widely used in clinical practice for anti-tumor drug infusion, long-term parenteral nutrition support, and the treatment of critically ill patients. To reduce complications, extend catheter indwelling time, lower medical costs, and ensure the safety and effectiveness of intravenous therapy, it is essential to ensure the accurate placement of the PICC tip before use.

[0003] Currently, the most commonly used method for PICC tip positioning in clinical practice is chest X-ray, but it has drawbacks such as positioning lag and radiation exposure.

[0004] CN104887265B discloses a system and method for catheter placement within a vascular system through a sterile area. The integrated system includes a system console, a distal positioning sensor for temporary placement in a patient's chest, and an ultrasound detector. The distal positioning sensor detects the magnetic field of a probe positioned within the lumen of the catheter as it is placed within the vascular system. Prior to catheter insertion, the ultrasound detector ultrasoundically images a portion of the vascular system. ECG signal-based catheter distal guidance is included in the integrated system to enable guidance of the catheter distal end to a desired location relative to the patient's heart.

[0005] CN110624169A discloses a neonatal PICC catheter positioned using a magnetic field. It includes a standard 1.9Fr PICC catheter and an inner metal guidewire. The guidewire comprises a magnetic tip made of 3Cr13Mo martensitic stainless steel and a non-magnetic guidewire body made of pure silver Ag999 connected to the magnetic tip. It is also equipped with a hollow spherical magnetic bead for surface indication, made of Nd2Fe14B, a strongly magnetic sintered neodymium iron boron permanent magnet. By observing the rolling trajectory and stopping position of the surface positioning magnetic bead as the PICC catheter tip changes position within the body, the PICC placement operator can monitor the catheter tip's location in real time, promptly detect and adjust any misalignment of the PICC catheter tip. No additional equipment is required, making the procedure simple and easy to perform.

[0006] Electromagnetic navigation and positioning technology is a safe and non-invasive emerging positioning method that combines electromagnetic guidance with intracavitary electrocardiography (IC-ECG) positioning. It enables dynamic navigation and real-time positioning of the catheter tip during PICC placement. The magnetic guidewire in the PICC catheter provides magnetic energy to display the real-time position information of the catheter tip. The magnetic guidewire tip has multiple magnets to provide magnetic energy information. When the magnetic guidewire passes through a curved blood vessel, the tip is subjected to bending forces. In this situation, a gap with an opening on one side is formed between the individual magnets, causing localized stretching of the sheath.

[0007] However, due to the low Young's modulus of the flexible thin-walled tube, the tensile stress against bending is low, and the bending force can be kept at a sufficiently low level. Therefore, the guidewire can pass smoothly through the bending section. If the bending angle is large, the magnet and the sheath may slip due to the local tensile stress generated by the bending force. Even if the bending force is removed, they cannot return to their original state, and a gap will appear between the magnets. (Because the magnet will be attracted to the core wire, and the sheath is flexible, the magnet will be stretched by the force, causing the magnet to get stuck in the stretched position and not easily return to its original position, which can easily lead to a gap between the magnets.) After a gap appears, the magnetic properties will weaken, and when the gap is subjected to bending force again, it is easy to concentrate stress and bend and break. For patients and clinicians, it is beneficial to have PICCs and support guidewires that are not prone to bending events, so that clinicians can correctly place the PICC without worrying about PICC or support guidewire failure.

[0008] To address the aforementioned problems, this invention provides a new type of magnetic conductor wire that can prevent the weakening of magnetic properties and the phenomenon of bending and breaking due to stress at the gaps between magnets. Utility Model Content

[0009] To solve the above-mentioned technical problems, this utility model provides a magnetic energy guide wire. By setting an elastic component to fix the position of the magnet, the problem of gaps appearing between magnets due to sliding after the magnetic energy guide wire is bent can be improved, and the bending resistance of the magnetic energy guide wire can also be improved.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] In a first aspect, this utility model provides a magnetic energy guide wire, which includes a core wire, a magnet assembly, and an elastic assembly disposed inside a sheath.

[0012] The core wire includes a first segment, a transition cone segment, and a second segment connected in sequence; the inner diameter of the elastic component is larger than the diameter of the second segment of the core wire; the magnet component includes at least two magnetic units, which are placed in contact with each other on one side of the second segment of the core wire.

[0013] The elastic component is sleeved on the core wire, one end of the elastic component is fixedly connected to the core wire, and the other end of the elastic component is attached to the magnet component.

[0014] In this invention, when the magnet assembly is partially bent, the position of the proximal end of the elastic component remains unchanged relative to the sheath. The elastic component applies elastic force to the magnet assembly and keeps the individual magnetic units of the magnet assembly in contact.

[0015] In this invention, an elastic component is placed at the rear end of the magnet assembly and closely attached to the magnet assembly. This can fix the position of the magnet assembly. When the end of the magnetic wire bends, the elastic component can be compressed by the magnet assembly, providing space for the magnet assembly to bend. After the straight line is restored, the restoring force of the elastic component pushes the magnet assembly back to its original position, avoiding the phenomenon of gaps between the individual magnetic units causing weakened magnetic properties and the phenomenon of bending and breaking again due to stress at the gap.

[0016] The magnetic conductor wire of this invention can effectively improve the problem of gaps between magnetic units due to sliding after bending, and can also improve the bending resistance of the magnetic conductor wire. By adding an elastic component, the position of the magnet assembly can be directly defined, which is convenient for processing. If there is no elastic component to fix the position, the magnet needs to be positioned during assembly, and it will move due to friction between the magnet and the sheath when installing the sheath, which increases the difficulty of operation. This invention can simplify the operation process and reduce the difficulty of production.

[0017] It should be noted that in this utility model, the proximal end is the end closer to the operator; the distal end is the end closer to the depth inside the patient's body.

[0018] It should be noted that the present invention does not impose specific requirements or special limitations on the number of magnetic units. Those skilled in the art can make adaptive adjustments to the number of magnetic units according to the actual application scenario.

[0019] It should be noted that in this utility model, the inner diameter of the elastic component is greater than the diameter of the second segment of the core wire, meaning that the difference between the two allows the elastic component to move freely.

[0020] As a preferred embodiment of this invention, the outer diameter of the first segment of the core wire is greater than or equal to that of the second segment.

[0021] Preferably, the first and second segments of the core wire have the same diameter.

[0022] Preferably, the small-diameter end of the transition cone segment is connected to the second segment; the large-diameter end of the transition cone segment is connected to the first segment.

[0023] Preferably, the inner diameter of the elastic component is smaller than the large diameter end of the transition cone segment, and it is engaged with the transition cone segment.

[0024] Preferably, one end of the elastic component is fixedly connected to the transition cone segment of the core wire by bonding or welding.

[0025] As a preferred embodiment of this invention, the elastic component includes a spring.

[0026] It should be noted that, in addition to springs, the elastic component in this utility model can also be an elastic rubber sleeve, etc.

[0027] Preferably, the elastic component is sleeved on the first to second section or the transition cone section to the second section of the core wire.

[0028] Preferably, the inner diameter of the elastic component is smaller than the diameter of the first segment of the core wire.

[0029] It should be noted that, in this utility model, as another embodiment of "one end of the elastic component is fixedly connected to the core wire", the inner diameter of the elastic component can be larger than the diameter of the first segment of the core wire. In this case, one end of the elastic component is fixedly connected to the core wire by pasting or welding.

[0030] As a preferred technical solution of this utility model, one end of the elastic component is engaged with the outer wall of the transition cone segment, thereby restricting the axial and radial displacement of the elastic component.

[0031] As a preferred embodiment of this invention, the inner diameter of the sheath is larger than the outer diameter of the magnet assembly.

[0032] Preferably, the magnetic units have the same diameter.

[0033] Preferably, the shape of the magnetic unit includes any one of cylindrical, cubic, and spherical shapes, with cylindrical being the most preferred.

[0034] As a preferred technical solution of this utility model, the ratio of the inner diameter of the sheath to the outer diameter of the magnet assembly is 1:0.5-0.8, such as 1:0.5, 1:0.6, 1:0.7, 1:0.8, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0035] In this invention, the inner diameter of the sheath is larger than the outer diameter of the magnet assembly. By limiting the ratio of the inner diameter of the sheath to the outer diameter of the magnet assembly, the bending performance of the magnetic wire can be improved. When the outer diameter of the magnet assembly is the same, the larger the ratio of the inner diameter of the sheath to the outer diameter of the magnet assembly, the larger the size of the sheath will be, and the worse the bending performance of the magnetic wire will be. If the inner diameter of the sheath is too large beyond the limits of this invention, the bending stiffness of the magnetic wire will increase, making it more prone to breakage.

[0036] As a preferred technical solution of this utility model, a sealing element is provided at the distal end of the sheath, and the sealing element is fixedly connected to the distal end of the second segment of the core wire;

[0037] The proximal end of the sheath is fixedly connected to the first segment of the core wire or an elastic component.

[0038] As a preferred technical solution of this utility model, the outer surface of the magnet assembly is provided with a coating;

[0039] The coating includes a paraffin coating or a gold coating.

[0040] In this invention, by coating the surface of the magnetic monomer in the magnet assembly with a paraffin coating or a gold coating, the problem of magnetic monomer shedding debris or rusting can be avoided.

[0041] As a preferred technical solution of this utility model, the magnetic unit at the far end of the magnet assembly is fixedly connected to the sealing element.

[0042] As a preferred embodiment of this invention, the outer surfaces of the metal core wire and the sheath are each independently provided with a hydrophilic coating.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] The magnetic conductor wire of this invention can effectively improve the problem of gaps between magnets due to sliding after bending, and can also improve the bending resistance of the magnetic conductor wire. By adding an elastic component, the position of the magnet can be directly defined, which is convenient for processing. If there is no elastic component to fix the position, the magnet needs to be positioned during assembly, and it will move due to friction between the magnet and the sheath when installing the sheath, which increases the difficulty of operation. This invention can simplify the operation process and reduce the difficulty of production. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of a magnetic guide wire device provided by this utility model.

[0046] The components include: 1. Seals; 2. Magnetic units; 3. Sheaths; 4. Elastic components; and 5. Core wires.

[0047] Figure 2 These are actual images of the magnetic conductor wires in Embodiments 1, 3-4, and Comparative Example 1 of this utility model.

[0048] Figure 3 These are actual images of the magnetic conductor wires in Embodiments 1, 3-4, and Comparative Example 1 of this utility model when bent at 90°.

[0049] Figure 4 The actual images of the magnetic conductor wires in Embodiments 1, 3-4, and Comparative Example 1 after bending 90° and then recovering.

[0050] Figure 5 These are actual images of the magnetic conductor wires in Embodiments 1, 3, and Comparative Example 1 of this utility model when bent at 60°.

[0051] Figure 6 The actual images of the magnetic conductor wires in Embodiments 1, 3, and Comparative Example 1 after bending 60° and then recovering.

[0052] Figure 7 These are actual images of the magnetic conductor wires of Embodiment 1 and Comparative Example 1 of this utility model when bent at 45°.

[0053] Figure 8 This is a photograph of the magnetic conductor wire of Embodiment 1 and Comparative Example 1 of this utility model after it has been bent 45° and then recovered. Detailed Implementation

[0054] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples are merely simplified examples of this utility model and do not represent or limit the scope of protection of this utility model. The scope of protection of this utility model is determined by the claims.

[0055] Example 1

[0056] This embodiment provides a magnetic energy guide wire, which includes a core wire 5, a magnet assembly, and an elastic assembly 4 disposed inside a sheath 3;

[0057] The core wire 5 includes a first section, a transition cone section, and a second section connected in sequence; the inner diameter of the elastic component 4 is larger than the diameter of the second section of the core wire 5; the magnet component includes four magnetic units 2, which are placed in contact with each other on one side of the second section of the core wire 5.

[0058] The elastic component 4 is sleeved on the core wire 5, one end of the elastic component 4 is fixedly connected to the core wire 5, and the other end of the elastic component 4 is attached to the magnet assembly;

[0059] When the magnet assembly is partially bent, the position of the proximal end of the elastic component 4 remains unchanged relative to the sheath 3. The elastic component 4 applies elastic force to the magnet assembly and keeps the individual magnetic units 2 of the magnet assembly in contact.

[0060] The outer diameter of the first section of the core wire 2 is equal to that of the second section; the elastic component 4 includes a spring; the elastic component 4 is sleeved on the transition cone section to the second section of the core wire 2;

[0061] One end of the elastic component 4 is engaged with the outer wall of the transition cone section, restricting the axial and radial displacement of the elastic component 4; the inner diameter of the sheath 3 is larger than the outer diameter of the magnet assembly; the diameters of the magnetic single units 2 are the same; the shape of the magnetic single unit 2 is cylindrical; the ratio of the inner diameter of the sheath 3 to the outer diameter of the magnet assembly is 1:0.75; a sealing element 1 is provided at the distal end of the sheath 3, and the sealing element 1 is fixedly connected to the distal end of the second segment of the core wire 5; the proximal end of the sheath 3 is fixedly connected to the first segment of the core wire 5; a coating is provided on the outer surface of the magnet assembly; the coating is a Pyrelin coating; the magnetic single unit 2 at the distal end of the magnet assembly is fixedly connected to the sealing element 1; the outer surfaces of the core wire 5 and the sheath 3 are each independently provided with a hydrophilic coating.

[0062] Example 2

[0063] This embodiment provides a magnetic energy guide wire, which includes a core wire 5, a magnet assembly, and an elastic assembly 4 disposed inside a sheath 3;

[0064] The core wire 5 includes a first section, a transition cone section, and a second section connected in sequence; the inner diameter of the elastic component 4 is larger than the diameter of the second section of the core wire 5; the magnet component includes 6 magnetic units 2, which are placed in contact with each other on one side of the second section of the core wire 5.

[0065] The elastic component 4 is sleeved on the core wire 5, one end of the elastic component 4 is fixedly connected to the core wire 5, and the other end of the elastic component 4 is attached to the magnet assembly;

[0066] When the magnet assembly is partially bent, the position of the proximal end of the elastic component 4 remains unchanged relative to the sheath. The elastic component 4 applies elastic force to the magnet assembly and keeps the individual magnetic units 2 of the magnet assembly in contact.

[0067] The outer diameter of the first section of the core wire 5 is larger than that of the second section; the elastic component 4 is a spring; the elastic component 4 is sleeved on the first and second sections of the core wire 5;

[0068] One end of the elastic component 4 is engaged with the outer wall of the transition cone section, restricting the axial and radial displacement of the elastic component 4; the inner diameter of the sheath 3 is larger than the outer diameter of the magnet assembly; the diameters of the individual magnetic units 2 are the same; the shape of the individual magnetic units 2 is spherical; the ratio of the inner diameter of the sheath 3 to the outer diameter of the magnet assembly is 1:0.8; a sealing element 1 is provided at the distal end of the sheath 3, and the sealing element 1 is fixedly connected to the distal end of the second segment of the core wire 5; the proximal end of the sheath 3 is fixedly connected to the elastic component 4; a coating is provided on the outer surface of the magnet assembly; the coating is a gold coating; the individual magnetic units 2 at the distal end of the magnet assembly are fixedly connected to the sealing element 1; the outer surfaces of the core wire 5 and the sheath 3 are each independently provided with a hydrophilic coating.

[0069] Example 3

[0070] This embodiment provides a magnetic conductor wire, which differs from Embodiment 1 only in that the ratio of the inner diameter of the sheath 3 to the outer diameter of the magnet assembly is 1:0.49. The other device structures are the same as in Embodiment 1.

[0071] Example 4

[0072] This embodiment provides a magnetic conductor wire, which differs from Embodiment 1 only in that the ratio of the inner diameter of the sheath 3 to the outer diameter of the magnet assembly is 1:0.21. The other device structures are the same as in Embodiment 1.

[0073] Comparative Example 1

[0074] This comparative example provides a magnetic guide wire, which differs from Example 1 only in that the elastic component 4 is not provided, while the structure of the other devices is the same as that of Example 1.

[0075] Performance testing

[0076] If the outer diameter of the magnetic unit remains unchanged, then Example 1 (denoted as...) The inner diameter of the sheath in Sample No. 1 (1:0.75) is 0.4 mm; Example 3 (denoted as The inner diameter of the sheath in Sample No. 1 (1:0.49) is 0.61 mm; Example 4 (denoted as The inner diameter of the sheath of sample 1 (1:0.21) is 1.45 mm; the inner diameter of the sheath of comparative example 1 (denoted as) is 1.45 mm. Sample No. 1 (1:0.75) has an inner diameter of 0.4mm for the sheath and does not have a spring.

[0077] The magnetic wires in Examples 1, 3-4, and Comparative Example 1 were bent at 90°, 60°, and 45° respectively. The results during and after bending are as follows: Figure 3-8 As shown;

[0078] The test results show that:

[0079] (1) Through Figure 3-8 It can be seen that the magnetic wire prepared in Embodiment 1 of this utility model can still return to its original shape after being bent at 90°, 60° and 45° respectively, without the problem of gaps appearing between magnetic units due to sliding after the magnetic wire is bent, which significantly improves the bending resistance of the magnetic wire.

[0080] In Examples 3 and 4, the ratio of the inner diameter of the sheath to the outer diameter of the magnet assembly was adjusted respectively. The resulting magnetic wire could not return to its original shape after being bent at 90° and 60°, and it bent. The bending resistance of the magnetic wire was poor. This shows that by further limiting the ratio of the inner diameter of the sheath to the outer diameter of the magnet assembly, the present invention can effectively improve the bending of the magnetic wire.

[0081] In Comparative Example 1, no elastic component was provided. After being bent at 90°, 60°, and 45° respectively, it could not return to its original shape. Because Comparative Example 1 did not have an elastic component, the position of the magnet component could not be fixed. When the magnetic wire was bent, the magnet was bent and slid under force, and was attracted to the metal core wire, thus embedding into the gap between the sheath and the metal core wire. This resulted in a weakening of the magnetic properties, and the gap was prone to stress concentration, leading to bending and breakage.

[0082] In summary, this invention provides a magnetic conductor wire that effectively improves the problem of gaps arising between magnetic units due to sliding after bending, while also improving the wire's bending resistance. The addition of an elastic component directly defines the position of the magnet assembly, facilitating processing. Without this elastic component, the magnet's position must be determined during assembly, and it will move due to friction between the magnet and the sheath during installation, increasing operational difficulty. This invention simplifies the process and reduces production difficulty.

[0083] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A magnetic conductor wire, characterized in that, The magnetic conductor wire includes a core wire, a magnet assembly, and an elastic assembly disposed inside the sheath; The core wire includes a first segment, a transition cone segment, and a second segment connected in sequence; the inner diameter of the elastic component is larger than the diameter of the second segment of the core wire; the magnet component includes at least two magnetic units, which are placed in contact with each other on one side of the second segment of the core wire. The elastic component is sleeved on the core wire, one end of the elastic component is fixedly connected to the core wire, and the other end of the elastic component is attached to the magnet component.

2. The magnetic conductor wire according to claim 1, characterized in that, The outer diameter of the first segment of the core wire is greater than or equal to that of the second segment.

3. The magnetic conductor wire according to claim 1 or 2, characterized in that, The elastic component includes a spring; Preferably, the elastic component is sleeved on the first to second section or the transition cone section to the second section of the core wire.

4. The magnetic conductor wire according to any one of claims 1-3, characterized in that, One end of the elastic component is engaged with the outer wall of the transition cone segment.

5. The magnetic conductor wire according to any one of claims 1-4, characterized in that, The inner diameter of the sheath is larger than the outer diameter of the magnet assembly; Preferably, the magnetic units have the same diameter; Preferably, the shape of the magnetic unit includes any one of cylindrical, cubic, and spherical shapes, with cylindrical being the most preferred.

6. The magnetic conductor wire according to any one of claims 1-5, characterized in that, The ratio of the inner diameter of the sheath to the outer diameter of the magnet assembly is 1:(0.5-0.8).

7. The magnetic conductor wire according to any one of claims 1-6, characterized in that, The distal end of the sheath is provided with a sealing element, which is fixedly connected to the distal end of the second segment of the core wire; The proximal end of the sheath is fixedly connected to the first segment of the core wire or an elastic component.

8. The magnetic conductor wire according to any one of claims 1-7, characterized in that, The outer surface of the magnet assembly is provided with a coating; The coating includes a paraffin coating or a gold coating.

9. The magnetic conductor wire according to any one of claims 1-8, characterized in that, The magnetic unit at the distal end of the magnet assembly is fixedly connected to the seal.

10. The magnetic conductor wire according to any one of claims 1-9, characterized in that, The outer surfaces of the core wire and the sheath are each independently coated with a hydrophilic coating.

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