Puncture guide wire

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a puncture guide wire which comprises a puncture body and a rigidity balancing sleeve. The puncture body comprises at least two first puncture sections which are connected in sequence, and in every two adjacent first puncture sections, the diameter of the first puncture section close to the far end of the puncture guide wire is smaller than that of the other first puncture section; the number of the rigidity balance sleeves is at least two, the rigidity balance sleeves correspond to the first puncture sections in a one-to-one mode, the corresponding first puncture sections are fixedly sleeved with the rigidity balance sleeves, and in every two adjacent rigidity balance sleeves, the outer diameter of the rigidity balance sleeve close to the far end of the puncture guide wire is larger than that of the other rigidity balance sleeve. The flexural rigidity of the rigidity balance sleeve close to the far end of the puncture guide wire is larger than that of the other rigidity balance sleeve. Puncture guide wires with different strengths do not need to be replaced repeatedly, so that the operation time is saved, and the operation risk is reduced. And the size of the included angle opening of the U-shaped puncture head cannot be increased along with the feeding of the puncture guide wire, so that the blood vessel is prevented from being burst.

Description

Technical Field

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

[0002] Guidewires, a common instrument in interventional medicine, are widely used in procedures such as percutaneous transluminal coronary angioplasty (PTCA) and percutaneous transluminal angioplasty (PTA). In interventional diagnosis and treatment, guidewires primarily provide a track for interventional devices such as balloon catheters, guiding them to the site of vascular lesions. They are an indispensable component of interventional procedures.

[0003] Clinically, the most important and fundamental performance characteristic of guidewires is the safety of the guidewire tip. This means the guidewire must have a suitable tip; a tip that is too soft will be unable to pass through lesions within the blood vessel, while a tip that is too stiff will easily cause perforation during use. Currently, in interventional procedures for vascular stenosis, multiple guidewires of different specifications are frequently used. Changing guidewires requires withdrawing the entire guidewire from the patient's body and then reinserting a different specification guidewire to the lesion site. This process may occur multiple times, wasting surgical time and increasing surgical risks.

[0004] Therefore, there is an urgent need for a puncture guidewire to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a puncture guidewire whose puncture strength gradually increases from its distal end to its proximal end, making it easy to adapt to the location of vascular lesions. This eliminates the need to repeatedly change guidewires with different puncture strengths, saving surgical time and reducing surgical risks.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Puncture guidewire, including:

[0008] The puncture body includes at least two first puncture segments connected in sequence. In two adjacent first puncture segments, the diameter of the first puncture segment closer to the distal end of the puncture guidewire is smaller than the diameter of the other first puncture segment.

[0009] At least two stiffness balancing sleeves are provided, each stiffness balancing sleeve corresponding to each of the first puncture segments and fixedly sleeved on the corresponding first puncture segment. In two adjacent stiffness balancing sleeves, the outer diameter of the stiffness balancing sleeve closer to the distal end of the puncture guide wire is larger than the outer diameter of the other stiffness balancing sleeve, and the bending stiffness of the stiffness balancing sleeve closer to the distal end of the puncture guide wire is greater than the bending stiffness of the other stiffness balancing sleeve.

[0010] Optionally, the stiffness balancing sleeve is a helical spring.

[0011] Optionally, in two adjacent helical springs, the pitch of the helical spring closer to the distal end of the puncture guide wire is smaller than the pitch of the other helical spring.

[0012] Optionally, in two adjacent helical springs, the wall thickness of the helical spring closer to the distal end of the puncture guide wire is greater than the wall thickness of the other helical spring.

[0013] Optionally, a transition section is provided between two adjacent first puncture segments, and the diameter of the transition section gradually increases from the end of one first puncture segment near the distal end of the puncture guidewire to the end of the other first puncture segment.

[0014] Optionally, it also includes developing rings, with each of the two adjacent stiffness balancing sleeves having a developing ring.

[0015] Optionally, each of the developing rings is fixedly sleeved on the corresponding transition section.

[0016] Optionally, the puncture body further includes a second puncture segment connected to the proximal end of the puncture body, the diameter of the second puncture segment being smaller than the outer diameter of each of the stiffness balancing sleeves.

[0017] Optionally, it may also include a guide layer that covers each of the stiffness balancing sleeves.

[0018] Optionally, it also includes an operating section connected to the puncture body.

[0019] Beneficial effects:

[0020] The puncture guidewire provided by this utility model, during use, is bent from distal to proximal, forming an inverted U-shaped puncture head at the distal end. When this head is inserted into the vascular lesion, if the resistance at the lesion exceeds the strength of the puncture head, the puncture head, compressed by the lesion, retracts further proximally as the operator advances. This allows the thinner, more rigid balancing sleeve to become the puncture head that contacts the lesion, increasing the puncture strength. When the puncture strength matches the lesion, penetration is achieved, eliminating the need to repeatedly change guidewires of different strengths, saving surgical time and reducing surgical risks. From distal to proximal, because the outer diameter of the adjacent rigid balancing sleeves decreases, while the bending stiffness of the guidewire remains essentially unchanged, the opening size of the puncture head formed by the bend does not increase with further advance of the guidewire, thus preventing rupture of the blood vessel. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the puncture guidewire provided in an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the puncture guidewire provided in an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0025] Figure 5 This is a schematic diagram of the puncture guidewire provided in this embodiment of the utility model in use.

[0026] In the picture:

[0027] 1. Puncture body; 11. First puncture segment; 12. Transition segment; 13. Second puncture segment;

[0028] 2. Stiffness balancing sleeve;

[0029] 3. Guiding layer;

[0030] 4. Development ring;

[0031] 5. Operation segment. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] like Figures 1-4 As shown, this embodiment provides a puncture guidewire, specifically comprising a puncture body 1 and a stiffness balancing sleeve 2.

[0037] See Figure 3 and Figure 4 As shown, the puncture body 1 includes at least two first puncture segments 11 connected in sequence. In two adjacent first puncture segments 11, the diameter of the first puncture segment 11 closer to the distal end of the puncture guide wire is smaller than the diameter of the other first puncture segment 11. At least two stiffness balancing sleeves 2 are provided, each stiffness balancing sleeve 2 corresponding to each first puncture segment 11 and fixedly sleeved on the corresponding first puncture segment 11. In two adjacent stiffness balancing sleeves 2, the outer diameter of the stiffness balancing sleeve 2 closer to the distal end of the puncture guide wire is larger than the outer diameter of the other stiffness balancing sleeve 2, and the bending stiffness of the stiffness balancing sleeve 2 closer to the distal end of the puncture guide wire is greater than the bending stiffness of the other stiffness balancing sleeve 2.

[0038] The puncture guidewire provided in this embodiment has a distal end (the end furthest from the operator) and a proximal end (the end closest to the operator). From the distal to the proximal end, in adjacent first puncture segments 11, the diameter of the first puncture segment 11 closer to the distal end is smaller than the diameter of the other first puncture segment 11. Therefore, the bending stiffness of the first puncture segment 11 closer to the distal end is less than that of the other first puncture segment 11. The bending stiffness of adjacent stiffness balancing sleeves 2 is the opposite. After the stiffness balancing sleeve 2 is fitted onto the corresponding first puncture segment 11, the puncture guidewire can have approximately or even the same bending stiffness at each position. Simultaneously, since the outer diameter of the stiffness balancing sleeve 2 gradually decreases from the distal to the proximal end of the puncture guidewire, the cross-section gradually decreases. From the distal to the proximal end, the bending stiffness of the puncture guidewire remains approximately constant, while the puncture cross-section decreases. Therefore, the puncture pressure of the puncture guidewire gradually increases from the distal to the proximal end, i.e., the puncture intensity gradually increases.

[0039] like Figure 5 As shown, when using a guidewire, the distal end of the guidewire is bent proximally, forming an inverted U-shaped puncture head. This head is then inserted into the vascular lesion. If the resistance at the lesion is greater than the strength of the puncture head, as the operator advances the wire, the puncture head is compressed by the lesion, causing the distal end to retract proximally. This allows the thinner, more rigid balancing sleeve 2 to become the puncture head that connects with the lesion, increasing the puncture strength. When the puncture strength matches the lesion, penetration is achieved without needing to repeatedly change guidewires of different strengths, saving surgical time and reducing surgical risks. From distal to proximal, because the outer diameter of the adjacent rigid balancing sleeves 2 decreases, while the bending stiffness of the guidewire remains essentially unchanged, the opening size of the puncture head formed by the bend does not increase with further advance of the guidewire, thus preventing rupture of the blood vessel.

[0040] Optionally, such as Figure 4 As shown, the stiffness balancing sleeve 2 is a helical spring. The helical spring has good tactile feedback, is less likely to cause vascular perforation, has greater friction on the puncture guidewire, provides good instrument tracking, and has good guidewire visibility (under fluoroscopy).

[0041] Optionally, in two adjacent helical springs, the pitch of the helical spring closer to the distal end of the puncture guide wire is smaller than the pitch of the other helical spring. That is, by changing the pitch of the helical springs, the bending stiffness of the adjacent helical springs is adjusted, so that the bending stiffness of the helical springs gradually decreases from the distal end to the proximal end.

[0042] Optionally, such as Figure 4As shown, in two adjacent helical springs, the wall thickness of the helical spring closer to the distal end of the puncture guide wire is greater than that of the other helical spring. That is, by adjusting the wall thickness of the helical springs, the bending stiffness of adjacent helical springs is gradually reduced from the distal end to the proximal end. In this embodiment, the helical springs are made of stainless steel. The two ends of the helical springs are welded to the corresponding first puncture section 11 to achieve their fixation on the first puncture section 11.

[0043] Optionally, such as Figure 4 As shown, a transition section 12 is provided between two adjacent first puncture sections 11. The diameter of the transition section 12 gradually increases from the end of one first puncture section 11 near the distal end of the puncture guidewire to the end of the other first puncture section 11. The transition section 12 helps to smooth the steps formed by first puncture sections 11 with different diameters and reduce resistance.

[0044] Optionally, such as Figure 4 As shown, the puncture guidewire also includes a contrast ring 4, with a contrast ring 4 positioned between each of two adjacent stiffness balancing sleeves 2. The contrast ring 4 facilitates observation by the doctor during puncture to understand the puncture status. In this embodiment, the contrast ring 4 is a gold contrast ring 4.

[0045] Optionally, such as Figure 4 As shown, each developing ring 4 is fixedly sleeved on the corresponding transition section 12. Specifically, the developing ring 4 is sleeved and welded onto the transition section 12.

[0046] Optionally, such as Figure 3 As shown, the puncture body 1 also includes a second puncture section 13, which is connected to the proximal end of the puncture body 1. The diameter of the second puncture section 13 is smaller than the outer diameter of each stiffness balancing sleeve 2.

[0047] Optionally, such as Figure 4 As shown, it also includes a guide layer 3, which covers each stiffness balancing sleeve 2. The guide layer 3 improves the smoothness and tracking of the puncture guidewire and makes the movement of the instrument on the guidewire smoother. In this embodiment, the guide layer 3 is made of polyether block polyamide material. Furthermore, the guide layer 3 also covers the second puncture section 13.

[0048] Optionally, such as Figure 1 and Figure 2 As shown, the puncture guidewire also includes an operating section 5, which is connected to the puncture body 1 to facilitate operation by the operator.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A puncture guide wire, characterized by, include: The puncture body (1) includes at least two first puncture segments (11) connected in sequence. In two adjacent first puncture segments (11), the diameter of the first puncture segment (11) closer to the distal end of the puncture guidewire is smaller than the diameter of the other first puncture segment (11). At least two stiffness balancing sleeves (2), each stiffness balancing sleeve (2) corresponds one-to-one with each of the first puncture segments (11), and is fixedly sleeved on the corresponding first puncture segment (11). In two adjacent stiffness balancing sleeves (2), the outer diameter of the stiffness balancing sleeve (2) closer to the distal end of the puncture guide wire is larger than the outer diameter of the other stiffness balancing sleeve (2), and the bending stiffness of the stiffness balancing sleeve (2) closer to the distal end of the puncture guide wire is greater than the bending stiffness of the other stiffness balancing sleeve (2).

2. The puncture guide wire according to claim 1, wherein The stiffness balancing sleeve (2) is a helical spring.

3. The puncture guide wire according to claim 2, wherein In two adjacent helical springs, the pitch of the helical spring closer to the distal end of the puncture guide wire is smaller than the pitch of the other helical spring.

4. The puncture guide wire according to claim 2, wherein In two adjacent helical springs, the wall thickness of the helical spring closer to the distal end of the puncture guide wire is greater than the wall thickness of the other helical spring.

5. The puncture guide wire according to claim 1, wherein A transition section (12) is provided between two adjacent first puncture segments (11), and the diameter of the transition section (12) gradually increases from the end of one first puncture segment (11) near the distal end of the puncture guide wire to the end of the other first puncture segment (11).

6. The puncture guide wire according to claim 5, wherein It also includes a developing ring (4), and the developing ring (4) is provided between two adjacent stiffness balancing sleeves (2).

7. The puncture guide wire according to claim 6, wherein Each of the developing rings (4) is fixedly sleeved on the corresponding transition section (12).

8. The puncture guide wire according to claim 1, wherein The puncture body (1) further includes a second puncture section (13), which is connected to the proximal end of the puncture body (1). The diameter of the second puncture section (13) is smaller than the outer diameter of each of the stiffness balancing sleeves (2).

9. The puncture guide wire of claim 1, wherein, It also includes a guide layer (3), which covers each of the stiffness balancing sleeves (2).

10. The puncture guide wire of claim 1, wherein, It also includes an operation segment (5), which is connected to the puncture body (1).

Images