Micro guide wire
By setting multiple spaced elastic segments and reverse helical structures on the micro guidewire, the problem of loose force on the spring when reverse torsion is solved, the torsion performance of the micro guidewire is improved, and the success rate of interventional surgery is ensured.
Patent Information
- Application Number
- CN202323605104.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-27
AI Technical Summary
When the micro guidewire twists against the spiral direction of the spring, the spring is loose, resulting in a degradation of torsional performance and affecting the success rate of interventional surgery.
A micro guide wire is designed, which is provided with a plurality of spaced elastic segments at both ends of the first spring and is fixedly connected on the core wire, reducing the absorption of torque force by the spring through the formed partition unit, and combining with the second spring The reverse helical structure is used to offset torque forces and improve torsional performance.
It effectively reduces the impact of the spring on the torsional performance of the micro guidewire, ensures that the micro guidewire is less stressed when reverse torsion, and improves the success rate of interventional surgery and the navigation ability of the micro guidewire in the blood vessels.
Smart Images
Figure CN222172845U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to a micro guide wire. Background Art
[0002] Microguidewire is an intravascular interventional diagnostic and treatment device, which is used to provide a basic track for interventional devices such as catheters, stents, and balloons, and guide them to the corresponding diagnosis and treatment area. It is an indispensable supporting product for selectively entering intracranial blood vessels during interventional surgery. In order to increase the flexibility and stability of the microguidewire, a spring is set at one end of the microguidewire, and both ends of the spring are fixed to the microguidewire. The spring allows one end of the microguidewire to maintain a certain tension and elasticity to better navigate and pass through the blood vessels.
[0003] Due to the characteristics of the spring spiral structure, when twisting the microguidewire, twisting along the direction of the spring spiral can make the spring tight and the torque transmission capacity will not be affected. However, when twisting against the direction of the spring spiral, the spring spiral will be loosened and the torque force will be absorbed in the spring segment, resulting in a decrease in the torsional performance of the microguidewire, which may prevent the microguidewire from reaching the target position and affect the progress of the interventional surgery. Utility Model Content
[0004] The main purpose of the utility model is to provide a micro guide wire, aiming to reduce the influence of a spring on the torsional performance of the micro guide wire.
[0005] To achieve the above-mentioned purpose, the micro guide wire proposed by the utility model comprises:
[0006] core wire; and
[0007] The first spring is sleeved on one end of the core wire, the two ends of the first spring are fixedly connected to the core wire, and the first spring forms a plurality of elastic sections arranged at intervals.
[0008] Optionally, the first spring has a plurality of fixing portions located between two ends of the first spring, and each of the fixing portions is fixedly connected to the core wire, so that the first spring forms a plurality of elastic segments arranged at intervals.
[0009] Optionally, the fixing portions are arranged at equal intervals along the length direction of the first spring.
[0010] Optionally, the distance between any two adjacent fixing portions is a, 10 mm ≤ a ≤ 30 mm.
[0011] Optionally, corresponding to each of the fixing portions, the first spring is welded or bonded to the core wire.
[0012] Optionally, the first spring includes a plurality of elastic coils, at least two adjacent elastic coils are fixedly connected to form a separation unit, and the first spring includes a plurality of the separation units, so that the first spring forms a plurality of the elastic segments arranged at intervals.
[0013] Optionally, the micro guide wire further includes a second spring having a spiral direction opposite to that of the first spring, the second spring and the first spring are nested with each other, the second spring is sleeved on one end of the core wire, and both ends of the second spring are fixedly connected to the core wire.
[0014] Optionally, the outer surface of the first spring is provided with a hydrophilic coating.
[0015] Optionally, the core wire includes a core wire body and a guide section connected to each other, and the first spring is sleeved on an end of the guide section away from the core wire body; the cross-sectional area of the guide section gradually decreases from an end close to the core wire body to an end away from the core wire body.
[0016] Optionally, the first spring comprises a buffer section and a developing section connected to each other, the buffer section is close to the core wire body, and the developing section is far away from the core wire body;
[0017] Wherein, the material of the buffer section is stainless steel, and the material of the developing section is platinum or gold.
[0018] In the technical solution of the utility model, the first spring forms a plurality of elastic segments arranged at intervals. When the micro-guidewire is twisted against the spiral direction of the first spring, due to the interval arrangement of the elastic segments, the force applied to the first spring during reverse twisting is interrupted, and the first spring is less loose, which can reduce the absorption of torque by the first spring, thereby reducing the influence of the first spring on the torsional performance of the micro-guidewire. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0020] Figure 1 A schematic structural diagram of an embodiment of the micro guide wire provided by the utility model;
[0021] Figure 2 Schematic diagram of the structure of the core wire;
[0022] Figure 3 It is a schematic diagram of the structure of the combination of the first spring and the second spring;
[0023] Figure 4 The present invention is a schematic structural diagram of another embodiment of the micro-guidewire provided by the present invention.
[0024] Description of Figure Numbers:
[0025] Label name Label name 1000 Micro guide wire 2 First Spring 1 Core wire 21 Buffer segment 11 Core wire body 22 Buffer segment 12 Guide section 3 Fixed part 13 Curved guide head 4 Second spring
[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. 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 of 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] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0030] Please refer to Figure 1 to Figure 2 The utility model provides a micro guide wire 1000, comprising a core wire 1 and a first spring 2, wherein the first spring 2 is sleeved on one end of the core wire 1, and both ends of the first spring 2 are fixedly connected to the core wire 1, and the first spring 2 forms a plurality of elastic segments arranged at intervals.
[0031] In this embodiment, the first spring 2 forms a plurality of elastic segments arranged at intervals. When the micro-guidewire 1000 is twisted against the spiral direction of the first spring 2, due to the interval arrangement of the elastic segments, the force applied to the first spring 2 during reverse twisting is interrupted, and the first spring 2 is less loose when subjected to force, which can reduce the absorption of torque by the first spring 2, thereby reducing the influence of the first spring 2 on the torsional performance of the micro-guidewire 1000.
[0032] Specifically, in one embodiment of the present invention, please refer to Figure 1 The first spring 2 has a plurality of fixing portions 3 located between the two ends of the first spring 2, and each fixing portion 3 is fixedly connected to the core wire 1, so that the first spring 2 forms a plurality of elastic segments arranged at intervals, that is, the fixing portions 3 separate the first spring 2 into a plurality of elastic segments arranged at intervals. In addition, the fixing portions 3 are arranged at equal intervals along the length direction of the first spring 2. After the first spring 2 is fixedly connected to the core wire 1 through the plurality of fixing portions 3, the lengths of the plurality of elastic segments of the first spring 2 separated by the plurality of fixing portions 3 are equal. On this basis, the number of fixing portions 3 can be designed according to the performance of the core wire 1 and the first spring 2. Different numbers of fixing portions 3 correspond to elastic segments of different lengths, so that the influence of the first spring 2 on the torsional performance of the micro guide wire 1000 can be reduced as much as possible while maintaining the tension and elasticity of the micro guide wire 1000.
[0033] It is understandable that, when the length of the first spring 2 is fixed, the smaller the distance between two adjacent fixing portions 3, the more the number of fixing portions 3, the corresponding number of elastic segments will increase, the length of the elastic segments will decrease, and the influence of the first spring 2 on the torsional performance of the micro-guidewire 1000 will also decrease. However, if the distance between two adjacent fixing portions 3 is too short, it will affect the tension and elasticity of one end of the micro-guidewire 1000 on which the first spring 2 is sheathed. For this reason, in one embodiment of the present utility model, please refer to Figure 1 The distance between any two adjacent fixing portions 3 is a, 10mm≤a≤30mm. When the distance between any two adjacent fixing portions 3 is within this range, the influence of the first spring 2 on the torsional performance of the micro guide wire 1000 can be reduced as much as possible while maintaining the tension and elasticity of the micro guide wire 1000.
[0034] It should be noted that the fixing portion 3 may not be fixed to the core wire, but at least two adjacent elastic coils corresponding to the fixing portion 3 are fixedly connected, that is, by fixing two or more adjacent elastic coils to form multiple fixing portions, multiple elastic segments arranged at intervals can also be formed.
[0035] Further, in one embodiment of the present invention, please refer to Figure 1, corresponding to each fixing part 3, the first spring 2 is connected to the core wire 1 by welding, which can be laser spot welding or soldering. If each fixing part 3 after soldering with silver-containing tin material has a high density, it can play an auxiliary role in size reference development during surgery. In another embodiment of the utility model, corresponding to each fixing part 3, the first spring 2 is connected to the core wire 1 by bonding. The bonding connection is simple and fast, and is suitable for occasions with limited space.
[0036] In one embodiment of the utility model, the first spring 2 includes a plurality of elastic coils, at least two adjacent elastic coils are fixedly connected to form a separation unit, and the first spring 2 includes a plurality of separation units, so that the first spring 2 forms a plurality of elastic segments, and the process of fixing the adjacent plurality of elastic coils to form a separation unit can be performed before the first spring 2 is sleeved on the core wire 1, so as to facilitate production. Similarly, the distance between two adjacent separation units is equal, so that the lengths of the elastic segments are equal, and on this basis, the number of separation units can be designed according to the performance of the core wire 1 and the first spring 2, and different numbers of separation units correspond to elastic segments of different lengths, so that the influence of the first spring 2 on the torsional performance of the micro guide wire 1000 can be reduced as much as possible while maintaining the tension and elasticity of the micro guide wire 1000.
[0037] In order to better reduce the influence of the spring on the torsional performance of the micro guide wire 1000, in one embodiment of the present utility model, please refer to Figure 3 and Figure 4 , the micro guide wire 1000 also includes a second spring 4 with a spiral direction opposite to that of the first spring 2, the pitch of the first spring 2, the wire diameter of the first spring 2, the pitch of the second spring 4 and the wire diameter of the second spring 4 are all equal, the first spring 2 and the second spring 4 can be nested in each other's pitches, as a spring with both positive and negative spiral directions, and then the spring is sleeved on one end of the core wire 1, so that when the core wire 1 is twisted clockwise or counterclockwise, the positive and negative spirals of the first spring 2 and the second spring 4 offset each other's absorption of torque, further improving the torque transmission performance of the micro guide wire 1000. In addition, the above embodiments can also be combined, for example, corresponding to each fixing portion 3, the first spring 2 and the second spring 4 can be fixed on the core wire 1 at the same time, so as to form the above springs into a plurality of elastic segments arranged at intervals.
[0038] Furthermore, in one embodiment of the utility model, the outer surface of the first spring 2 is provided with a hydrophilic coating, which can make the outer surface of the first spring 2 have good wettability, reduce blood retention, and reduce the friction coefficient of the outer surface of the first spring 2, so as to facilitate the micro guidewire 1000 to pass through tortuous and small blood vessels.
[0039] In order to smoothly pass through the blood vessels, in one embodiment of the present utility model, please refer to Figure 2The core wire 1 includes a core wire body 11 and a guide section 12 connected to each other, and the first spring 2 is sleeved on the end of the guide section 12 away from the core wire body 11; the cross-sectional area of the guide section 12 gradually decreases from the end close to the core wire body 11 to the end away from the core wire body 11. In this way, the guide section 12 has a refined and gradual structure, so that the pushing performance and softness of the core wire 1 are better.
[0040] Specifically, in one embodiment of the present invention, please refer to Figure 2 The diameter of the core wire body 11 is 0.35mm, the diameter of the maximum cross-sectional area of the guide segment 12 is 0.35mm, and the diameter of the minimum cross-sectional area of the guide segment 12 is 0.10mm, that is, the diameter is gradually refined from 0.35mm to 0.10mm. The refinement method can be grinding or electrochemical refinement. The length of the guide segment 12 is 500mm to 600mm, so as to adapt to the characteristics of the gradual thinning and complex tortuosity of the diameter of the aortic arch blood vessels from the heart to the intracranial blood vessels of the human body.
[0041] In order to prevent the core wire 1 from puncturing a blood vessel, in one embodiment of the present utility model, please refer to Figure 1 An arc-shaped guide head 13 is provided at one end of the guide section 12 away from the core wire body 11 .
[0042] Specifically, in one embodiment of the present invention, please refer to Figure 1 The first spring 2 includes a buffer section 2122 and a developing section connected to each other, wherein the buffer section 2122 is close to the core wire body 11, and the developing section is far away from the core wire body 11. The total length of the first spring 2 is 300 mm to 400 mm, wherein the buffer section 2122 is 30 mm to 50 mm long and is made of a material with a high density such as platinum, a platinum-containing alloy or gold, and is used for intraoperative development reference. The remaining part is the buffer section 2122, which is made of stainless steel and is used to improve the bending and recovery performance of the micro guide wire 1000, and to increase the metal volume on the positioning length of the micro guide wire 1000, so as to ensure the radiographic detectability of the micro guide wire 1000 in the blood vessel.
[0043] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A micro guide wire, characterized in that: include: Core wire; and A first spring, wherein the first spring is sleeved on one end of the core wire, both ends of the first spring are fixedly connected to the core wire, and the first spring forms a plurality of elastic segments arranged at intervals; The first spring has a plurality of fixing portions located between two ends of the first spring, and each of the fixing portions is fixedly connected to the core wire, so that the first spring forms a plurality of elastic segments arranged at intervals.
2. The micro guide wire according to claim 1, characterized in that: The fixing portions are arranged at equal intervals along the length direction of the first spring.
3. The micro guide wire according to claim 1, characterized in that: The distance between any two adjacent fixing parts is a, 10 mm ≤ a ≤ 30 mm.
4. The micro guide wire according to claim 1, characterized in that: Each of the fixing parts is welded or bonded to the core wire.
5. The micro guidewire according to any one of claims 1 to 4, characterized in that: The micro guide wire also includes a second spring with a spiral direction opposite to that of the first spring. The second spring and the first spring are nested with each other. The second spring is sleeved on one end of the core wire, and both ends of the second spring are fixedly connected to the core wire.
6. The micro guidewire according to any one of claims 1 to 4, characterized in that: The outer surface of the first spring is provided with a hydrophilic coating.
7. The micro guidewire according to any one of claims 1 to 4, characterized in that: The core wire comprises a core wire body and a guide section connected to each other, and the first spring is sleeved on an end of the guide section away from the core wire body; the cross-sectional area of the guide section gradually decreases from an end close to the core wire body to an end away from the core wire body.
8. The micro guide wire according to claim 7, characterized in that: The first spring comprises a buffer section and a developing section connected to each other, the buffer section is close to the core wire body, and the developing section is far away from the core wire body; Wherein, the material of the buffer section is stainless steel, and the material of the developing section is platinum or gold.