Chronic occlusion recanalization guidewire

Abstract

This invention provides a guidewire for opening chronic occlusion, belonging to the field of interventional medical device technology. The guidewire includes a guidewire body with a guide tip at its distal end. The guide tip has an internal puncture section and an outer sheath covering the puncture section. The distal end of the outer sheath extends beyond the puncture section, so that the puncture section is completely contained within the outer sheath. The puncture section is a pointed structure with a diameter that gradually decreases from proximal to distal. The outer sheath has an elastically expandable segment that deforms along the axial and / or radial directions. When the guidewire advances normally, the puncture section is located inside the outer sheath. Upon reaching the target position, the distal end of the outer sheath compresses the target position, causing the elastically expandable segment to compress axially. The distal end of the puncture section extends out of the outer sheath to puncture the target position. This invention primarily addresses the technical problems in existing technologies, such as the difficulty in balancing the hardness and flexibility of the guidewire tip, the difficulty in penetrating hard calcified plaques, and the easy damage to the blood vessel wall.

Description

Technical Field

[0001] This invention belongs to the field of interventional medical device technology, specifically relating to a guidewire for opening chronic occlusion. Background Technology

[0002] Chronic occlusion refers to a chronic ischemic disease in which the lumen of an artery gradually narrows and becomes blocked due to long-term factors such as atherosclerosis and thrombosis, and the disease progresses for more than 3 months. The degree of stenosis in the lumen at the site of the lesion usually reaches more than 70% or even close to complete occlusion. At this time, the blood flow in the artery is severely insufficient, which can easily lead to insufficient blood supply to critical organs such as the heart, brain, and lower limbs, causing diseases such as angina pectoris, myocardial infarction, cerebral infarction, and limb ischemic necrosis, which pose a great threat to the patient's life and health.

[0003] Currently, interventional surgery has become the mainstream treatment for chronic occlusion due to its advantages of being minimally invasive, highly efficient, and having a fast recovery. The core principle is to puncture blood vessels and deliver interventional devices such as guidewires, balloons, and stents to the occlusion site in sequence. Through procedures such as balloon dilation and stent implantation, the occluded blood vessels are opened, blood perfusion is restored, thereby relieving organ ischemia symptoms and reducing the risk of fatal complications.

[0004] In interventional treatment of chronic occlusion, the guidewire, as the guiding component of the entire procedure, plays a crucial role in first penetrating the occlusion site and guiding the subsequent delivery of balloons and stents. The successful passage of the guidewire through the occlusion site directly determines the success or failure of the interventional procedure and the treatment outcome. However, in clinical practice, the guidewire faces many insurmountable technical challenges when passing through chronic occlusion sites. The most common problem is that, due to the long-term development of chronic occlusion atherosclerotic plaques, they gradually calcify and fibrose, becoming hardened. The guidewire must overcome significant resistance during advancement, making it difficult to penetrate the hardened calcified plaques.

[0005] Currently, interventional guidewires used in clinical practice mainly improve their delivery performance and flexibility by optimizing materials (such as nickel-titanium alloys), improving surface coatings (such as hydrophilic coatings), or adjusting their structure. However, their adaptability to chronic occlusion sites remains significantly insufficient. For example, it is difficult to achieve a precise balance between the stiffness and flexibility of the tip of existing guidewires. If the tip is too stiff, it can easily damage the fragile vessel wall of the chronically occluded segment, while if the tip is too soft, it cannot penetrate the hard calcified occlusion.

[0006] To address these issues, retrograde guidewire techniques and rotational atherectomy for calcified plaques are commonly used in clinical practice to improve the success rate of guidewire penetration through chronically occluded sites. However, these techniques still present several technical challenges: for example, retrograde guidewire techniques are complex to perform, require a high level of clinical experience from the physician, and are time-consuming, increasing the patient's surgical risks and medical costs; while rotational atherectomy for calcified plaques can remove some of the hardened calcified tissue, it demands a high level of skill from the operator and carries the risk of damaging the vessel wall due to improper operation.

[0007] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0008] The purpose of this invention is to provide a guidewire for opening chronic occlusion, so as to solve the technical problems in the prior art that it is difficult to balance the hardness and flexibility of the guidewire tip, difficult to penetrate hard calcified plaques, and easy to damage the blood vessel wall.

[0009] To achieve the above objectives, the chronic occlusion recanalization guidewire of the present invention provides the following technical solution: A guidewire for opening chronic occlusion includes a guidewire body. The distal end of the guidewire body has a guide tip. The guide tip has an internal puncture section and an outer sheath covering the outside of the puncture section. The distal end of the outer sheath extends beyond the puncture section so that the puncture section is completely contained within the outer sheath. The puncture section is a pointed structure with a diameter that gradually decreases from the proximal end to the distal end. The outer sheath has an elastic telescoping section that deforms in the axial and / or radial directions. When the guidewire advances normally, the puncture section is located inside the outer sheath. After reaching the target position, the distal end of the outer sheath compresses the target position to axially compress the elastic telescoping section, and the distal end of the puncture section extends out of the outer sheath to puncture the target position.

[0010] As a further optimized technical solution, a contrast cap is arranged at the distal end of the outer sheath layer. The distal outer surface of the contrast cap is spherical, and the contrast cap has a perforation for the puncture section to pass through axially.

[0011] As a further optimized technical solution, the imaging cap has a receiving cavity inside to accommodate radial swaying of the distal end of the puncture section.

[0012] As a further optimized technical solution, the radial dimension of the distal end of the receiving cavity is larger than the radial dimension of the perforation.

[0013] As a further optimized technical solution, the receiving cavity is conical in shape, with the larger diameter end facing the perforation.

[0014] As a further optimized technical solution, the distal end of the receiving cavity has a spherical stopping area, the center of which is located on the axis of the guidewire body.

[0015] As a further optimized technical solution, the distal end of the puncture section extends a predetermined distance into the receiving cavity.

[0016] As a further optimized technical solution, the elastic compression section is an elastic bellows or a helical spring.

[0017] As a further optimized technical solution, an eccentric portion is arranged on the outer sheath layer at the distal end of the elastic compression section to increase the radial sway amplitude at the distal end of the outer sheath layer, thereby helping to improve the radial dimension of the puncture section penetrating the target position.

[0018] As a further optimized technical solution, the eccentric part is a mass block arranged on one side of the outer sheath layer, and the density of the mass block is greater than the density of the outer sheath layer.

[0019] Beneficial effects: The chronic occlusion recanalization guidewire provided by this invention achieves a balance between the hardness and flexibility of the guidewire tip through the coordinated design of the puncture section and the outer sheath. During normal advancement, the puncture section is housed inside the outer sheath, which provides protection and prevents the puncture section from scratching the vessel wall. At the same time, the elastic expansion section of the outer sheath ensures the flexibility of the guidewire, facilitating its smooth advancement within the vessel. Upon reaching the target occlusion site, the outer sheath compresses the occlusion site, causing the elastic expansion section to compress, allowing the puncture section to extend and penetrate the hard calcified plaque using its tip structure. This solves the problem of existing guidewires being unable to penetrate calcified occlusions.

[0020] Furthermore, a contrast-enhancing cap is placed at the distal end of the outer sheath, its spherical outer surface allowing for smooth passage through tortuous blood vessels. During the procedure, the surgeon can clearly track the position of the contrast-enhancing cap under X-ray fluoroscopy, thus facilitating the determination of the relative positional relationship between the guidewire tip and the lesion.

[0021] Furthermore, by incorporating a receiving cavity within the contrast cap and designing it as a conical structure with a distal radial dimension larger than the perforation, a controllable radial swing space is provided for the distal end of the puncture segment. This design allows the guide tip to swing within the receiving cavity even when it bends while traversing tortuous or angular vessel segments. The elastic stretching segment undergoes axial and radial deformation within a certain range due to the tortuous vascular passage, resulting in non-pure axial compression. This allows the puncture segment to swing within the receiving cavity, providing an internal buffer space for the bending of the guidewire body. This allows the puncture segment within the receiving cavity to undergo relative displacement and swinging when the outer sheath bends, avoiding the risk of the puncture segment tip accidentally protruding from the perforation due to outer sheath bending. This achieves a dynamic avoidance effect, ensuring that the puncture segment remains safely contained within the contrast cap when the guidewire passes through complex tortuous paths. It prevents vascular dissection or perforation that may be caused by accidental rigid puncture due to guidewire bending, significantly improving the safe passage rate of the guidewire in complex anatomical structures.

[0022] Furthermore, the distal end of the puncture section is pre-set to a predetermined distance into the receiving cavity, so that it is in a ready state. When the elastic extension section is compressed, the puncture section can quickly extend out of the perforation with the shortest stroke, reducing the empty stroke and improving the responsiveness of the puncture action, so that the doctor can complete the puncture operation more promptly.

[0023] Furthermore, an eccentric portion is added to the distal end of the outer sheath. When the puncture segment has penetrated the hard lesion and the elastic stretching segment has been fully compressed to its limit (i.e., the puncture segment extension reaches its maximum length), continued rotation and slight pushing and pulling of the guidewire body will cause radial wobbling generated by the eccentric portion to be directly transmitted to the tip of the puncture segment that has penetrated deep into the lesion. This wobbling creates a small centrifugal force within the lesion, which can effectively expand the initial microchannel formed after the puncture segment passes through, assisting in the formation of a larger diameter through-channel. This creates more favorable conditions for the smooth passage of subsequent balloons and stents, and is especially suitable for extremely dense, hard fibrocalcified lesions, significantly improving the success rate of interventional procedures. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the distal structure of the guidewire body in Embodiment 1 of the present invention for chronic occlusion recanalization; Figure 2 This is a schematic diagram of the compression of the elastic extension section of the guidewire in Embodiment 1 of the present invention for chronic occlusion opening. Figure 3 This is a schematic diagram of the distal bending state of the outer sheath of Embodiment 1 of the chronic occlusion opening guidewire of the present invention; Figure 4 This is a schematic diagram of the distal structure of the guidewire body in Embodiment 2 of the present invention for chronic occlusion recanalization; Figure 5 This is a schematic diagram of the distal structure of the guidewire body in Embodiment 3 of the present invention for chronic occlusion opening guidewire.

[0025] In the diagram: 100, guidewire body; 110, guide tip; 111, puncture section; 112, outer sheath; 113, elastic telescopic section; 114, imaging cap; 115, perforation; 116, receiving cavity; 117, blocking area; 118, eccentric part. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0027] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, the term "proximal end" uniformly refers to the end closer to the operator, while "distal end" refers to the end farther from the operator.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0029] The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions of the product; they are only intended to illustrate the content of the invention.

[0030] This invention provides a guidewire for opening chronic occlusion. The guidewire includes a guidewire body 100, with a guide tip 110 at its distal end. The guide tip 110 includes an internal puncture section 111 and an outer sheath 112 covering its outer side. The distal end of the outer sheath 112 extends beyond the puncture section 111, completely containing the puncture section 111 within the outer sheath 112. The outer sheath 112 has an elastically deformable and / or radially deformable extension segment 113. During normal guidewire advancement, the puncture section 111 is covered by the outer sheath 112, forming a blunt tip for safe movement along the blood vessel towards the lesion. When encountering a hard lesion, the outer sheath 112 is compressed, causing the elastically deformable extension segment 113 to compress axially, and the distal end of the puncture section 111 extends for precise puncture. Preferably, the distal end of the outer sheath 112 is provided with a contrast cap 114 having a perforation 115 and a receiving cavity 116 for intraoperative positioning and guiding the puncture direction; in addition, an eccentric portion 118 is provided on the outer sheath 112 at the distal end of the elastic stretching segment 113 for rotating the guidewire after puncture to assist in widening the puncture channel. This invention has a simple structure, is easy to operate, requires no complex auxiliary means, balances flexibility and puncture rigidity, significantly reduces the risk of vascular injury, and is suitable for interventional recanalization surgery for various types of chronic vascular occlusion lesions.

[0031] Example 1 like Figure 1 As shown, this embodiment provides a chronic occlusion opening guidewire, including a slender and flexible guidewire body 100, with a guide head end 110 disposed at its distal end.

[0032] The guidewire body 100 is a slender shaft-shaped structure with good torque transmission performance and flexibility. It is usually composed of a core wire and an outer covering layer. Its proximal end is connected to the operating handle (not shown in the figure), and its distal end has a guide head 110, which is used to transmit the operator's pushing force and rotational torque to the guide head 110.

[0033] The guide tip 110 has an internal puncture section 111 and an outer sheath 112 covering the outside of the puncture section 111. The puncture section 111 is a slender, needle-like structure made of a high-strength, highly elastic metallic material (such as nickel-titanium alloy or stainless steel). Its distal end has a tapered tip structure with a diameter that gradually decreases from proximal to distal to form a cutting edge with high puncture performance; its proximal end is integrally fixedly connected to the distal end of the core wire of the guidewire body 100. The function of this component is to extend the outer sheath 112 when it is necessary to penetrate hard lesions, concentrating stress to puncture the occluded tissue.

[0034] The outer sheath 112 is a thin-walled tubular structure. Its proximal end is fixedly connected to or integrally formed with the distal end of the outer covering layer of the guidewire body 100. The distal end extends axially beyond the distal end of the puncture section 111, so that in its natural state, the puncture section 111 is completely contained within the lumen of the outer sheath 112. The main function of the outer sheath 112 is to cover and protect the puncture section 111 during guidewire advancement, forming a blunt and safe guide tip.

[0035] The outer sheath 112 has an elastically expandable section 113 that deforms in the axial and / or radial directions, and this section adopts an elastic bellows structure. When the guidewire advances normally, the puncture section 111 is located at the proximal end of the outer sheath 112. When the guide tip 110 reaches the target position (the narrow area to be punctured), the distal end of the outer sheath 112 compresses the target position to cause the elastically expandable section 113 to undergo axial compression. The distal end of the puncture section 111 extends out of the outer sheath 112 to puncture the target position. After the puncture is completed, its elastic restoring force is used to pull back the distal end of the outer sheath 112, so that the puncture section 111 is retracted into the interior.

[0036] A contrast-enhancing cap 114 is disposed at the distal end of the outer sheath 112. The contrast-enhancing cap 114 is made of an X-ray-impermeable material (such as platinum-iridium alloy, gold, or tantalum) and has an overall cap-like structure. Its distal outer surface has a smooth spherical contour, forming a smooth passage surface, which facilitates safe advancement within the blood vessel lumen without damaging the vascular intima. The proximal end of the contrast-enhancing cap 114 is fixedly connected to the distal end of the outer sheath 112, forming a sealed and secure interface between the two.

[0037] The developing cap 114 has a through-hole 115 for the axial extension of the puncture section 111. The through-hole 115 is located at the center of the developing cap 114 and is an axially penetrating circular through-hole with a diameter slightly larger than the outer diameter of the puncture section 111, forming a guide channel for the extension and retraction of the puncture section 111. The function of the through-hole 115 is to constrain the extension direction of the puncture section 111, ensuring that it advances substantially along the axis. The developing cap 114 has a receiving cavity 116 inside to accommodate the radial movement of the distal end of the puncture section 111. The receiving cavity 116 is located near the proximal end of the through-hole 115 and communicates with it. The receiving cavity 116 is a conical cavity structure with a distal radial dimension larger than that of the through-hole 115. Its larger diameter end faces the through-hole 115, and its smaller diameter end faces the proximal end and communicates with the lumen of the outer sheath layer 112. The inner wall of the receiving cavity 116 is a smooth conical transition surface. The purpose of this design is to allow the guide tip 110 to traverse complex vascular segments with tortuous or angular shapes (such as...). Figure 3 As shown, the outer sheath 112 and the elastic expansion segment 113 bend and deform along the direction of the blood vessel. During this process, due to the complex direction of the force acting on the bend in the blood vessel channel, the compression of the elastic expansion segment 113 is not a pure axial deformation, but a composite deformation of axial and radial forces. At this time, the receiving cavity 116 can play a dynamic avoidance role: since the distal radial dimension of the receiving cavity 116 is larger than that of the perforation 115, an inward conical buffer space is formed. When the outer sheath 112 bends, the axis of the guidewire body 100 shifts, causing the distal end of the puncture segment 111 to undergo relative displacement and swinging within the receiving cavity 116. Specifically, the tip of the puncture segment 111 can swing within the conical space of the receiving cavity 116 and will not be forcibly pushed towards the perforation 115 due to the bending of the outer sheath 112. In this way, the risk of the tip of the puncture segment 111 being forced to accidentally protrude from the perforation 115 due to the bending of the outer sheath 112 is avoided. If the outer sheath bends and there is no buffer space inside the contrast cap 114, the bending force will be directly converted into an axial thrust on the puncture segment 111, causing the tip to be accidentally exposed. In other words, this embodiment, through the conical space of the receiving cavity 116, can ensure that the puncture segment 111 is always safely housed inside the contrast cap 114 throughout the entire process of the guidewire passing through a complex bending path. Even if the elastic telescopic segment 113 deforms to a certain extent due to the bending of the blood vessel, the swing space provided by the receiving cavity 116 can ensure that the tip of the puncture segment 111 does not break through the perforation 115, significantly improving the safe passage rate of the guidewire in complex anatomical structures.

[0038] Furthermore, the distal end of the receiving cavity 116 has a spherical stop area 117, the center of which is located on the axis of the guidewire body 100. Thus, during the repeated extension, retraction, and oscillation of the puncture section 111, the symmetrical curved surface structure of the spherical stop area 117 can evenly distribute the axial pressure and radial oscillation force transmitted by the puncture section 111, preventing local stress concentration that could lead to cracking or deformation of the inner wall of the receiving cavity 116, and also preventing the tip of the puncture section 111 from bending or being damaged due to excessive force on one side. Simultaneously, the smooth spherical surface can significantly reduce the frictional resistance between the puncture section 111 and the stop area 117, preventing the distal end of the puncture section 111 from becoming stuck.

[0039] Furthermore, the distal end of the puncture segment 111 extends into the receiving cavity 116 by a predetermined distance in its natural state. In this way, by pre-setting the insertion distance, the tip of the puncture segment 111 is directly located within the receiving cavity 116, significantly shortening the effective travel required from pressure to extension. As a result, when the doctor applies pushing force against a hard lesion, the puncture segment 111 can quickly extend out of the perforation 115, making the puncture action more immediate and sensitive, and improving the tactile feedback and control precision of the operation.

[0040] The working process of the guidewire for opening chronic occlusion in this embodiment is as follows: During the operation, the doctor inserts the guidewire into the body through the punctured blood vessel and advances it along the blood vessel to the vicinity of the chronic occlusion site. At this time, the puncture section 111 is completely contained inside the outer sheath layer 112. The spherical contrast-enhancing cap 114 of the outer sheath layer 112 protects the blood vessel wall. At the same time, the doctor observes the position of the contrast-enhancing cap 114 through imaging equipment and monitors the travel of the guidewire in real time. When it is in place, the doctor slowly pushes the guidewire body 100, so that the contrast-enhancing cap 114 at the distal end of the outer sheath layer 112 compresses the target occlusion site. The occlusion site generates reverse axial pressure on the contrast-enhancing cap 114. This pressure is transmitted to the elastic telescopic section 113, causing the elastic telescopic section 113 to compress axially, thereby driving the puncture section 111 to move distally. Figure 2 As shown, the distal end of the puncture segment 111 extends through the perforation 115 of the contrast cap 114 and out of the outer sheath 112. Its tip structure penetrates the hard calcified plaque to complete the puncture of the occluded site. After the puncture is completed, the doctor stops pushing the guidewire. The elastic telescopic segment 113 resets under its own elasticity, driving the puncture segment 111 back into the outer sheath 112. Then the guidewire can continue to be advanced, or subsequent balloons, stents and other instruments can be delivered for further opening operations.

[0041] Example 2 like Figure 4As shown, the difference between this embodiment and Embodiment 1 is that an eccentric portion 118 is provided on the outer sheath 112, at the distal end of the elastic stretching section 113, i.e., near the contrast cap 114. This eccentric portion 118 can be achieved by asymmetrically adding a tiny mass block (such as a radiopaque metal dot) to the wall of the outer sheath 112, with a density greater than that of the outer sheath 112, or by using a locally asymmetrical structure (such as local thickening or thinning). In this way, when the doctor rotates the guidewire body 100 externally, the eccentric portion 118 generates centrifugal force, causing a controllable radial wobbling or swinging at the distal end of the guidewire. This wobbling creates a tiny swinging centrifugal force within the lesion, effectively expanding the initial microchannel formed after the puncture segment 111 passes through, and assisting in the formation of a larger diameter through-channel. This creates more favorable conditions for the subsequent smooth passage of balloons and stents, and is particularly suitable for extremely dense, hard fibrocalcified lesions, significantly improving the success rate of interventional surgery.

[0042] Example 3 like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that the elastic telescopic section 113 adopts a helical spring structure. The helical spring has good axial telescopic performance and can be quickly compressed when subjected to axial pressure and quickly reset after the pressure is released. Its working process is the same as that of embodiment 1, and it can also realize the extension and retraction of the puncture section 111.

[0043] In summary, the chronic occlusion recanalization guidewire provided by this invention solves the technical problems of existing guidewires, such as difficulty in balancing the hardness and flexibility of the tip, difficulty in penetrating calcified plaques, and easy damage to the blood vessel wall, through the cooperation of the puncture segment and the outer sheath. The design of the contrast cap, receiving cavity, and eccentric part further improves the accuracy and success rate of puncture. The structure is simple and easy to operate, requiring no complicated auxiliary means, reducing surgical risks and medical costs, and has high clinical application value.

[0044] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are within the protection scope of the present invention.

Claims

1. A guidewire for opening chronic occlusion, comprising a guidewire body (100), characterized in that, The distal end of the guidewire body (100) has a guide tip (110), which has an internal puncture section (111) and an outer sheath (112) sleeved on the outside of the puncture section (111). The distal end of the outer sheath (112) extends beyond the puncture section (111) so that the puncture section (111) is completely contained within the outer sheath (112). The puncture section (111) has a diameter extending from the proximal end to the distal end. The outer sheath (112) has an elastically extensible segment (113) that deforms in the axial and / or radial directions as the guidewire advances normally. When the guidewire advances normally, the puncture section (111) is located inside the outer sheath (112). After reaching the target position, the distal end of the outer sheath (112) squeezes the target position so that the elastically extensible segment (113) is axially compressed. The distal end of the puncture section (111) extends out of the outer sheath (112) to puncture the target position.

2. The guidewire for opening chronic occlusion according to claim 1, characterized in that, The distal end of the outer sheath (112) is provided with a developing cap (114), the distal outer surface of which is spherical, and the developing cap (114) has a perforation (115) for the puncture section (111) to pass through axially.

3. The guidewire for opening chronic occlusion according to claim 2, characterized in that, The imaging cap (114) has a receiving cavity (116) inside for accommodating radial swaying of the distal end of the puncture section (111).

4. The guidewire for opening chronic occlusion according to claim 3, characterized in that, The radial dimension of the distal end of the receiving cavity (116) is greater than the radial dimension of the perforation (115).

5. The guidewire for opening chronic occlusion according to claim 4, characterized in that, The receiving cavity (116) is conical in shape, with the larger diameter end facing the perforation (115).

6. The guidewire for opening chronic occlusion according to claim 5, characterized in that, The distal end of the receiving cavity (116) has a spherical stop area (117), the center of which is located on the axis of the guidewire body (100).

7. The chronic occlusion recanalization guidewire according to any one of claims 3-6, characterized in that, The distal end of the puncture section (111) extends a predetermined distance into the receiving cavity (116).

8. The chronic occlusion recanalization guidewire according to any one of claims 1-6, characterized in that, The elastic compression section is an elastic bellows or a helical spring.

9. The chronic occlusion recanalization guidewire according to any one of claims 1-6, characterized in that, An eccentric portion (118) is arranged on the outer sheath (112) at the distal end of the elastic compression section to increase the radial sway amplitude at the distal end of the outer sheath (112) in order to help improve the radial dimension of the puncture section penetrating the target position.

10. The guidewire for opening chronic occlusion according to claim 9, characterized in that, The eccentric part (118) is a mass block arranged on one side of the outer sheath (112), and the density of the mass block is greater than the density of the outer sheath (112).

Images