Laser ablation catheter

Abstract

The invention relates to the field of ablation catheter equipment, in particular to a laser ablation catheter which is used for entering a blood vessel. The laser ablation catheter comprises an outer sleeve, an optical fiber bundle arranged in the outer sleeve and a guide wire cavity which is arranged in the outer sleeve and allows a guide wire to pass through. And a guide wire cavity inlet of the guide wire cavity extends to the catheter tip position at the far end of the laser ablation catheter, so that the outer sleeve is guided to advance to a target position through the guide wire. The guide wire cavity is formed in the catheter tip position at the far end of the laser ablation catheter, the diameter of the catheter can be effectively reduced, and meanwhile the laser ablation catheter can be used for treating atherosclerosis at the lower limb position and the coronary artery position.

Description

Technical Field

[0001] The invention relates to the field of ablation catheter equipment, and in particular to a laser ablation catheter used for lower limbs and coronary arteries. Background Art

[0002] Atherosclerosis can cause narrowing or blockage of the blood vessel lumen, resulting in poor blood circulation. Interventional therapy is an effective means of treating patients with atherosclerosis. Among them, laser ablation catheters are usually used to treat patients with atherosclerosis. Laser ablation refers to the use of ultraviolet lasers to irradiate atherosclerotic plaques in blood vessels. After being absorbed by atherosclerotic plaques, ultraviolet rays can destroy the carbon-hydrogen bonds of the plaques, causing the tissue temperature to rise and micro-steam bubbles to be generated at the front end of the catheter. The expansion and contraction of these micro-steam bubbles can disintegrate the plaques in the blood vessels. At the same time, the fragments at the tip of the catheter will be decomposed into water, gas, and tiny particles smaller than 10μm, which will eventually be absorbed by the reticuloendothelial system, thereby avoiding blockage of microvessels.

[0003] However, the laser ablation catheter in the prior art, such as the laser ablation catheter and laser ablation system disclosed in CN219700103U. In order to improve the ablation efficiency, the laser ablation catheter in the above-mentioned prior art usually integrates multiple optical fibers, resulting in a larger outer tube size of the ablation catheter, which leads to the problem of poor passability of the ablation catheter. The prior art discloses that: at the connecting tube position of the laser ablation catheter, a channel for the passage of interventional instruments such as guide wires is provided. However, the laser ablation catheter in the prior art only sets the guide wire at the connecting tube position of the laser ablation catheter, and it is impossible to reduce the diameter of the catheter while satisfying the requirement that the laser ablation catheter can be used to treat atherosclerosis in the lower limbs and coronary arteries. Therefore, those skilled in the art need a new laser ablation catheter. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is how to solve the problem that the laser ablation catheter in the prior art cannot reduce the diameter of the catheter while satisfying the requirement that the laser ablation catheter can be used to treat atherosclerosis in the lower limbs and coronary arteries.

[0005] The present invention provides a laser ablation catheter, which is used to enter a blood vessel; The laser ablation catheter comprises: an outer sleeve, an optical fiber bundle arranged in the outer sleeve, and a guidewire cavity arranged in the outer sleeve for a guidewire to pass through; and the guidewire cavity entrance of the guidewire cavity extends to the catheter tip position at the distal end of the laser ablation catheter to guide the outer sleeve to the target position through the guidewire.

[0006] Optionally, the guidewire outlet of the guidewire cavity is located at an opening on the side wall of the outer sleeve, and the guidewire inlet of the guidewire cavity is located at an opening position at the tip of the catheter; The guidewire inlet and the guidewire outlet are communicated with each other to form the guidewire cavity.

[0007] Optionally, the guide wire cavity is a double-layer tube body, the inner layer of the double-layer tube body is made of a lubricating material; or, the guide wire cavity is a single-layer tube body located inside the outer sleeve.

[0008] Optionally, the outer sleeve is made of polymer material and / or metal material, including any one or more of Pebax, nylon, TPU, ML21, TR55, nickel-titanium alloy, stainless steel, and tantalum.

[0009] Optionally, the guidewire cavity is made of polymer material, including any one or more of Pebax, TPU, PTFE, and ePTFE.

[0010] Optionally, the guidewire cavity is a double-layer tube body, and the outer layer material of the double-layer tube body is the same as the material of the outer sleeve.

[0011] Optionally, the laser ablation catheter further comprises: a tantalum ring, which is a positioning component developed under X-rays; and the tantalum ring is located outside the outer sleeve end of the catheter tip to position the laser ablation catheter head in the blood vessel; The tantalum ring faces the distal end of the laser ablation catheter and has a chamfer for improving the passability of the head of the laser ablation catheter; and / or the optical fiber bundle and / or the tantalum ring and / or the inner tube are connected by glue; the inner tube is located in the outer sleeve and forms the guidewire cavity.

[0012] Optionally, the hardness of the glue after curing is similar to that of the optical fiber bundle; The curing methods include: low temperature curing, room temperature curing, heating curing, air curing, water reaction curing, anaerobic curing, radiation curing, hot melt cold curing, and coagulation curing; the material of the glue includes: any one or more of epoxy resin glue, instant glue, anaerobic glue, UV glue, hot melt glue, and latex.

[0013] Optionally, the guidewire cavity is a long exchange structure with a length set to 8 mm to 1650 mm.

[0014] Optionally, the outer sleeve located at the distal end of the laser ablation catheter is a spring tube structure; the support performance and bending performance of the spring tube structure are greater than other parts of the outer sleeve.

[0015] Optionally, a metal ring is provided at the tip of the catheter to increase the support strength of the guidewire entrance of the guidewire cavity.

[0016] Optionally, the metal ring is fixedly connected to the inner tube of the guidewire cavity; The surface of the metal ring is provided with a connection hole; the inner tube and the metal ring are fixedly connected by bonding or welding through the connection hole; The bonding material used to fix the inner tube and the metal ring is glue or a polymer material, and the glue or the polymer material flows into the connecting hole to form a physical lock.

[0017] Optionally, the laser ablation catheter is a segmented structure made of polymer materials with different hardnesses to increase the compliance of the laser ablation catheter.

[0018] Optionally, the straight section of the laser ablation catheter is made of 72D Pebax material, and the curved section of the laser ablation catheter is made of 55D Pebax and / or 40D Pebax material.

[0019] Optionally, the optical fiber bundle in the laser ablation catheter is densely arranged, and its density is expressed as the total area of ​​the optical fiber cavity occupied by the optical fiber, and the density ranges from 0.3 to 0.95.

[0020] Optionally, the guidewire cavity is arranged on a side close to the inner wall of the outer sleeve and the outer sleeve; In use, the laser ablation catheter is driven to rotate along its circumferential direction to ablate the stenotic site of the blood vessel through the dense end of the optical fiber bundle.

[0021] Optionally, the guidewire cavity is arranged in the straight section of the laser ablation catheter, and the guidewire outlet and the guidewire inlet of the guidewire cavity are both located in the straight section; The optical fiber bundle extends to the tip of the distal end of the laser ablation catheter, forming a circular arrangement structure covering the tip of the laser ablation catheter, so as to perform concentrated surface ablation on the plaque.

[0022] Optionally, the laser ablation catheter comprises: an outer sleeve and an inner core that are independently arranged from each other; The inner core has an ablation state extending into the laser ablation catheter and being delivered to the lesion site.

[0023] Optionally, the core is a structure with bent ends, and the optical fiber bundle arranged in the core is an elliptical structure; the outer sleeve guides the core to keep the core straight; The outer surface of the inner core is covered with a memory metal layer so that the end of the inner core can return to a bent state after extending out of the outer sleeve; the end of the outer sleeve is also provided with a blocking piece for preventing the inner core from escaping from the outer sleeve.

[0024] A laser ablation catheter device comprises: a laser ablation catheter, a host connector and a transition tube body.

[0025] The technical solution of the present invention has the following advantages: 1. The laser ablation catheter provided by the present invention has a guidewire cavity extending to the catheter tip position at the distal end of the laser ablation catheter, which can not only guide the outer sleeve to the target position through the guidewire in the guidewire cavity, but also effectively reduce the diameter size of the laser ablation catheter, so that it can be used for lower limb and coronary artery treatment at the same time.

[0026] 2. The laser ablation catheter provided by the present invention can make the laser ablation catheter better move along the guide wire and reach the target position by configuring the guide wire cavity as a double-layer tube body and making the inner layer of the double-layer tube body of a lubricating material.

[0027] 3. The laser ablation catheter provided by the present invention further comprises: a tantalum ring. The tantalum ring can be used to locate the head of the laser ablation catheter in the blood vessel under X-ray.

[0028] 4. In the laser ablation catheter provided by the present invention, the tantalum ring has a chamfer toward the distal end of the laser ablation catheter, thereby effectively improving the passing performance of the laser ablation catheter.

[0029] 5. The laser ablation catheter provided by the present invention has an optional exchange structure length of the guidewire cavity. When the exchange length is a long exchange structure, the guidewire can remain in the human blood vessel after the laser ablation catheter enters the human body. The guidewire can increase the support strength of the laser ablation catheter, thereby improving the passing performance of the laser ablation catheter.

[0030] 6. The laser ablation catheter provided by the present invention has a spring tube structure at the distal end and the outer sleeve of the laser ablation catheter. The spring tube structure can effectively increase the support performance of the end of the laser ablation catheter, making it easier for the laser ablation catheter to enter the human body and reach the target position, while increasing the bending performance of the catheter.

[0031] 7. The laser ablation catheter provided by the present invention is also provided with a metal ring at the tip of the catheter. The metal ring can effectively increase the guidewire inlet support strength of the guidewire cavity and improve the pass rate of the laser ablation catheter. At the same time, the metal ring can also increase the energy transmission intensity of the laser ablation catheter, making the catheter more energy efficient.

[0032] 8. The laser ablation catheter provided by the present invention has a connection hole on the surface of the metal ring, so that the metal ring can be fixedly connected to the inner tube by bonding or welding, thereby greatly reducing the risk of the metal ring falling off.

[0033] 9. The laser ablation catheter provided by the present invention has a segmented structure of polymer materials with different hardnesses, thereby improving the flexibility of the laser ablation catheter and making it easier for the laser ablation catheter to reach the target position after entering the human body.

[0034] 10. The laser ablation catheter provided by the present invention has a dense arrangement of optical fiber bundles inside the laser ablation catheter, which can effectively reduce the difficulty of manufacturing the laser ablation catheter and allow the optical fiber bundle to be polished more smoothly.

[0035] 11. The laser ablation catheter provided by the present invention has a guidewire cavity disposed on one side close to the inner wall of the outer sleeve and inside the outer sleeve, so that the operator can rotate the laser ablation catheter so that the dense end of the optical fiber faces the narrowed position of the blood vessel, thereby increasing the ablation area and improving the ablation effect.

[0036] 12. The laser ablation catheter provided by the present invention has a guidewire cavity disposed in the straight section of the laser ablation catheter, so that the optical fiber bundle covers the tip of the laser ablation catheter, facilitating concentrated surface ablation of the plaque.

[0037] 13. The laser ablation catheter provided by the present invention can realize the independent rotation of the inner core by providing an outer sleeve and an inner core independently of each other, so that the inner core with a curved tip can be aligned with the plaque, thereby improving the ablation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the structure of a laser ablation catheter when the guidewire cavity extends to the catheter tip of the laser ablation catheter in the embodiment provided by the present invention; Figure 2 In the embodiment provided by the present invention, an enlarged schematic diagram of the catheter tip; Figure 3 A partially enlarged schematic diagram of a laser ablation catheter having a tantalum ring at the end in the embodiment provided by the present invention; Figure 4 A front view of the tip position of a laser ablation catheter in an embodiment provided by the present invention; Figure 5 In the embodiment provided by the present invention, the schematic diagram of the structure of the laser ablation catheter with a long exchange structure in the guidewire cavity; Figure 6 In the embodiment provided by the present invention, the outer sleeve is a schematic diagram of the laser ablation catheter structure of a spring tube structure; Figure 7 In the embodiment provided by the present invention, an enlarged schematic diagram of a catheter tip having a tantalum ring and a metal ring; Figure 8A front view of the tip position of a laser ablation catheter in an embodiment provided by the present invention; Fig. 9 A schematic diagram of the structure of the connection holes on the metal ring in the embodiment provided by the present invention; Fig.10 In the embodiment provided by the present invention, the laser ablation catheter is a schematic diagram of the laser ablation catheter structure of a segmented structure; Fig.11 In the embodiment provided by the present invention, a front view of the tip position of the laser ablation catheter when the guidewire cavity is eccentric; Fig.12 A schematic diagram of a vascular stenosis in a special state in an embodiment provided by the present invention; Fig.13 In the embodiment provided by the present invention, when the guidewire cavity is arranged in the straight section of the laser ablation catheter, a partially enlarged schematic diagram of the position; Fig.14 A schematic diagram of a laser ablation catheter tip covered with optical fiber bundles in an embodiment provided by the present invention; Fig.15 The present invention provides a schematic diagram of the connection between the inner core and the outer sleeve in the embodiment.

[0040] Description of reference numerals: 1-laser ablation catheter; 2-outer sleeve; 3-optical fiber bundle; 4-guidewire cavity; 5-catheter tip; 6-guidewire outlet; 7-guidewire inlet; 8-tantalum ring; 9-inner tube; 10-spring tube structure; 11-metal ring; 12-connecting hole; 13-straight section; 14-bending section; 15-glue; 16-core; 17-sealing piece; 18-host connector; 19-transition tube body. DETAILED DESCRIPTION The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] In the prior art, a channel for the passage of interventional instruments such as guide wires is set at the connection tube position of the laser ablation catheter. This will not only result in a larger catheter diameter, but also the laser ablation catheter cannot meet the treatment needs of atherosclerosis in the lower limbs and coronary arteries. In order to solve the above problems, 10 embodiments of the laser ablation catheter are described below: Example 1 See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of the laser ablation catheter is shown when the guidewire cavity in the embodiment of the present invention extends to the catheter tip of the laser ablation catheter. Figure 2 It is an enlarged schematic diagram of the catheter tip in an embodiment of the present invention.

[0045] The laser ablation catheter provided in this embodiment is used to enter a blood vessel. The laser ablation catheter 1 comprises: an outer sleeve 2, an optical fiber bundle 3 disposed in the outer sleeve 2, and a guidewire cavity 4 disposed in the outer sleeve 2 for a guidewire to pass through; and the guidewire cavity 4 extends to the position of the catheter tip 5 at the distal end of the laser ablation catheter 1, so as to guide the outer sleeve 2 to advance to the target position through the guidewire.

[0046] Furthermore, the outer sleeve 2 is made of polymer material; In another preferred embodiment, see Figure 6 , Figure 6 The schematic diagram of the structure of the laser ablation catheter in which the outer sleeve is a spring tube structure in the embodiment of the present invention is shown. The outer sleeve 2 located at the distal end of the laser ablation catheter 1 is a spring tube structure 10; the support performance and bending performance of the spring tube structure 10 are greater than other parts of the outer sleeve 2. The spring tube structure 10 can effectively increase the support performance of the end of the laser ablation catheter 1, making it easier for the laser ablation catheter 1 to enter the human body and reach the target position, while increasing the bending performance of the catheter.

[0047] In another preferred embodiment, the outer sleeve 2 is made of polymer material and / or metal material, including any one or more of Pebax, nylon, TPU, ML21, TR55, nickel-titanium alloy, stainless steel, and tantalum. The guidewire cavity 4 is made of polymer material, including any one or more of Pebax, TPU, PTFE, and ePTFE.

[0048] Furthermore, the optical fiber bundle 3 is arranged in the outer sleeve 2 to ablate the plaque; In a preferred embodiment, the optical fiber bundle 3 in the laser ablation catheter 1 is densely arranged, and its density is expressed as the total area of ​​the optical fiber cavity occupied by the optical fiber, and the density ranges from 0.3 to 0.95. The densely arranged optical fiber bundle 3 can effectively reduce the difficulty of manufacturing the laser ablation catheter 1 and make the optical fiber bundle 3 grinded more smoothly.

[0049] Furthermore, the guidewire cavity 4 is arranged in the outer sleeve 2 for the guidewire to pass through. In the present embodiment, the guidewire cavity 4 extends to the catheter tip 5 at the distal end of the laser ablation catheter 1, so as to guide the outer sleeve 2 to the target position through the guidewire. By extending the guidewire cavity 4 to the catheter tip 5 at the distal end of the laser ablation catheter 1, it is possible not only to guide the outer sleeve 2 to the target position through the guidewire in the guidewire cavity 4. Moreover, more importantly, it is also possible to effectively reduce the diameter size of the laser ablation catheter 1 so that it can be used for lower limb and coronary artery treatment at the same time. In the present embodiment, in order to effectively reduce the diameter size of the laser ablation catheter 1, the laser ablation catheter 1 can be used for lower limb and coronary artery treatment at the same time. As Figure 2 As shown, the guidewire outlet 6 of the guidewire cavity 4 is located at the side wall opening of the outer sleeve 2, and the guidewire inlet 7 of the guidewire cavity 4 is located at the opening position of the catheter tip 5; the guidewire inlet 7 and the guidewire outlet 6 are connected to form the guidewire cavity 4. Moreover, the structure of the guidewire cavity 4 is also defined in this embodiment. In order to enable the laser ablation catheter 1 to better advance along the guidewire and reach the target position. The guidewire cavity 4 is a double-layer tube body, the inner layer of the double-layer tube body is a lubricating material, and the outer layer material of the double-layer tube body is the same as the material of the outer sleeve 2. By setting the inner layer of the double-layer tube body to a lubricating material, the laser ablation catheter 1 can be better advanced along the guidewire; In a specific embodiment, the length of the exchange structure of the guidewire cavity 4 is optional, and the length of the exchange structure of the guidewire cavity 4 is set to 8mm to 1650mm. Figure 5 , Figure 5The schematic diagram of the structure of the laser ablation catheter with a long exchange structure of the guidewire cavity in the embodiment of the present invention is shown. When the exchange length is the long exchange structure, the guidewire is still in the human blood vessel after the laser ablation catheter 1 enters the human body, and the guidewire can improve the support strength of the laser ablation catheter 1, thereby improving the passing performance of the laser ablation catheter 1.

[0050] It can be understood that the above embodiment does not specifically limit whether the guidewire cavity 4 is a double-layer tube body or a single-layer tube body. In other embodiments, Figure 4 The front view of the tip position of the laser ablation catheter 1 is shown. The guidewire cavity 4 is a single-layer tube body located inside the outer tube 2.

[0051] Furthermore, the tantalum ring 8 is arranged at the end of the laser ablation catheter 1; Figure 3 As shown, a partially enlarged schematic diagram of a laser ablation catheter 1 having a tantalum ring at the end. In order to realize positioning of the head of the laser ablation catheter 1 in a blood vessel, a tantalum ring 8 is provided at the end of the laser ablation catheter 1, and the tantalum ring 8 is a positioning component developed under X-rays; and the tantalum ring 8 is located outside the end of the outer sleeve 2 of the catheter tip 5 to position the head of the laser ablation catheter 1 in the blood vessel. In addition, the tantalum ring 8 is chamfered toward the distal end of the laser ablation catheter 1, thereby improving the passability of the laser ablation catheter 1.

[0052] In another preferred embodiment, see Figure 7 and Figure 8 , Figure 7 An enlarged schematic diagram of a catheter tip with a tantalum ring and a metal ring in an embodiment of the present invention is shown. Figure 7 The front view of the tip position of the laser ablation catheter in the embodiment of the present invention is shown. In order to increase the support strength of the guidewire inlet 7 of the guidewire cavity 4, thereby improving the pass rate of the laser ablation catheter 1. In this embodiment, a metal ring 11 is also provided at the tip 5 of the catheter. The metal ring 11 is fixedly connected to the inner tube 9 of the guidewire cavity 4. The metal ring 11 can not only increase the support strength of the guidewire inlet 7 of the guidewire cavity 4, but also increase the energy transfer intensity of the laser ablation catheter 1, so that the catheter has higher energy efficiency. Fig. 9 As shown, a schematic diagram of the connection hole structure on the metal ring. The surface of the metal ring 11 is also provided with a connection hole 12; the inner tube 9 and the metal ring 11 are bonded and fixedly connected through the connection hole 12; the bonding material used to fix the inner tube 9 and the metal ring 11 is glue or a polymer material, and the glue or polymer material flows into the connection hole 12 to form a physical lock. In this embodiment, the connection hole 12 is a rectangular hole. Of course, those skilled in the art can set through holes of different shapes such as circular and pentagonal shapes as needed.

[0053] It can be understood that the above-mentioned embodiment does not specifically limit the connection method between the inner tube 9 and the metal ring 11. In other embodiments, a connection hole 12 is provided on the surface of the metal ring 11; the inner tube 9 and the metal ring 11 are fixedly connected by welding or bonding through the connection hole 12, thereby greatly reducing the risk of the metal ring 11 falling off.

[0054] Furthermore, in this embodiment, the optical fiber bundle 3, the tantalum ring 8 and the inner tube 9 are bonded and fixed by glue 15. The optical fiber bundle 3, the tantalum ring 8 and the inner tube 9 are bonded and connected by glue 15; the inner tube 9 is located in the outer sleeve 2 and forms the guidewire cavity 4. In addition, in this embodiment, the above components are fixed together by curing, and the hardness of the glue 15 after curing is similar to that of the optical fiber bundle 3.

[0055] It can be understood that the above-mentioned embodiment does not specifically limit the bonding method and curing method of the optical fiber bundle 3, the tantalum ring 8 and the inner tube 9. In other embodiments, the glue curing method of the optical fiber bundle 3, the tantalum ring 8 and the inner tube 9 can also be: low-temperature curing, room-temperature curing, heating curing, air curing, curing by reaction with water, anaerobic curing, radiation curing, hot melt cold curing, and coagulation curing; the material of the glue 15 includes: any one or more of epoxy resin glue, instant glue, anaerobic glue, UV glue, hot melt glue, and latex.

[0056] In another preferred embodiment, see Fig.11 , Fig.11 The front view of the tip position of the laser ablation catheter when the guidewire cavity is eccentric in the embodiment of the present invention is shown. In this embodiment, the guidewire cavity 4 is arranged near the inner wall of the outer tube 2 and near the inner wall of the outer tube 2. In the use state, the laser ablation catheter 1 is driven to rotate along its circumferential direction, and the stenosis position of the blood vessel is ablated through the dense end of the optical fiber bundle 3. For example, Fig.12 The operator can operate the laser ablation catheter 1 to rotate circumferentially toward the first stenosis position, so that the dense end of the optical fiber faces the stenosis position of the blood vessel, thereby increasing the ablation area and improving the ablation effect.

[0057] In another preferred embodiment, see Fig.13 and Fig.14 , Fig.13 A partially enlarged schematic diagram of a laser ablation catheter is shown when the guidewire cavity is arranged in the straight section of the laser ablation catheter in an embodiment of the present invention. Fig.14The schematic diagram of the tip of the laser ablation catheter covered with optical fiber bundles in an embodiment of the present invention is shown. The guidewire cavity 4 is arranged in the straight section 13 of the laser ablation catheter 1, and the guidewire outlet 6 and the guidewire inlet 7 of the guidewire cavity 4 are both located in the straight section 13; the optical fiber bundle 3 extends to the tip position of the distal end of the laser ablation catheter 1, forming a circular arrangement structure covering the tip of the laser ablation catheter 1, so as to facilitate concentrated surface ablation of plaques.

[0058] In another preferred embodiment, see Fig.13 and Fig.14 , Fig.13 A partially enlarged schematic diagram of a laser ablation catheter is shown when the guidewire cavity is arranged in the straight section of the laser ablation catheter in an embodiment of the present invention. Fig.14 The schematic diagram of the tip of the laser ablation catheter covered with optical fiber bundles in an embodiment of the present invention is shown. The laser ablation catheter 1 comprises: an outer sleeve 2 and an inner core 16 which are independently arranged; the inner core has a state of extending into the laser ablation catheter 1 and being delivered to the lesion site for ablation. Fig.15 The core 16 in this embodiment has a bent end structure, and the optical fiber bundle 3 arranged in the core 16 has an elliptical structure; the outer tube 2 guides the core 16 to keep the core 16 straight. Fig.13 As shown, the outer surface of the core 16 is provided with a memory metal layer so that the end of the core 16 can return to a bent state after extending out of the outer sleeve 2; the end of the outer sleeve 2 is also provided with a blocking member 17 for preventing the core 16 from slipping out of the outer sleeve 2. By providing the outer sleeve 2 and the core 16 independently of each other, the core 16 can be rotated independently, so that the core 16 with a curved tip is aligned with the plaque, thereby improving the ablation effect. In this embodiment, the guidewire cavity 4 is the central lumen of the outer sleeve 2. The guidewire passes through the central lumen of the outer sleeve 2, i.e., the guidewire cavity 4, to guide the guidewire into the target position in the blood vessel, and then the core 16 enters through the central lumen of the outer sleeve 2.

[0059] In another preferred embodiment, this embodiment does not specifically limit whether the tantalum ring 8 is provided with a chamfer toward the distal end of the laser ablation catheter 1. In other embodiments, the tantalum ring 8 is not provided with the above-mentioned chamfer toward the distal end of the laser ablation catheter 1.

[0060] In a specific embodiment, see Fig.10 , Fig.10The laser ablation catheter in the embodiment of the present invention is a schematic diagram of the laser ablation catheter structure of a segmented structure. The above-mentioned laser ablation catheter 1 is a segmented structure of a polymer material with different hardnesses. Setting the above-mentioned laser ablation catheter 1 as a segmented structure of a polymer material with different hardnesses can effectively improve the flexibility of the laser ablation catheter 1 and make it easier for the laser ablation catheter 1 to reach the target position after entering the human body. In this embodiment, the straight section 13 of the laser ablation catheter 1 is made of 72D Pebax material. In addition, the bend section 14 at the proximal position of the handheld end of the operator of the laser ablation catheter 1 is made of 55D Pebax material. The bend section 14 at the distal position away from the handheld end of the operator of the laser ablation catheter 1 is made of 40D Pebax material.

[0061] In another preferred embodiment, the straight section 13 of the laser ablation catheter 1 is made of 72D Pebax material, and the curved section 14 of the laser ablation catheter 1 is made of 55D Pebax and / or 40D Pebax material.

[0062] Example 2 See also Figure 1 , Figure 1 A schematic diagram of the structure of a laser ablation catheter in an embodiment of the present invention is shown. A laser ablation catheter device comprises: the laser ablation catheter 1 described in Embodiment 1; and a host connector 18 and a transition tube body 19.

[0063] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A laser ablation catheter, characterized in that: The laser ablation catheter (1) is used to enter a blood vessel; The laser ablation catheter (1) comprises: an outer sleeve (2), an optical fiber bundle (3) arranged in the outer sleeve (2), and a guidewire cavity (4) arranged in the outer sleeve (2) for a guidewire to pass through; and the guidewire cavity entrance of the guidewire cavity (4) extends to the position of the catheter tip (5) at the distal end of the laser ablation catheter (1) so as to guide the outer sleeve (2) to a target position through the guidewire.

2. The laser ablation catheter according to claim 1, characterized in that: The guidewire outlet (6) of the guidewire cavity (4) is located at an opening on the side wall of the outer sleeve (2), and the guidewire inlet (7) of the guidewire cavity (4) is located at an opening position at the tip of the catheter (5); The guidewire inlet (7) and the guidewire outlet (6) are connected to form the guidewire cavity (4).

3. The laser ablation catheter according to claim 1, characterized in that: The guidewire cavity (4) is a double-layer tube, the inner layer of which is made of a lubricating material; or The guidewire cavity (4) is a single-layer tube body located inside the outer sleeve (2).

4. The laser ablation catheter according to claim 1, characterized in that: Also includes: A tantalum ring (8), the tantalum ring (8) being a positioning component that is developed under X-rays; and the tantalum ring (8) is located outside the end of the outer sleeve (2) of the catheter tip (5) to position the head of the laser ablation catheter (1) in the blood vessel; The tantalum ring (8) is facing the distal end of the laser ablation catheter (1) and also has a chamfer for improving the passability of the head of the laser ablation catheter (1); and / or the optical fiber bundle (3) and / or the tantalum ring (8) and / or the inner tube (9) are bonded together by glue (15); the inner tube (9) is located in the outer sleeve (2) and forms the guide wire cavity (4).

5. The laser ablation catheter according to claim 1, characterized in that: The length of the exchange structure of the guidewire cavity (4) is set to 8 mm to 1650 mm.

6. The laser ablation catheter according to claim 1, characterized in that: The outer sleeve (2) located at the distal end of the laser ablation catheter (1) is a spring tube structure (10); the support performance and bending performance of the spring tube structure (10) are greater than those of other parts of the outer sleeve (2).

7. The laser ablation catheter according to claim 1, characterized in that: A metal ring (11) is also provided at the tip of the catheter (5) for increasing the support strength of the guidewire inlet (7) of the guidewire cavity (4); The metal ring (11) is fixedly connected to the inner tube (9) of the guide wire cavity (4); A connection hole (12) is provided on the surface of the metal ring (11); the inner tube (9) and the metal ring (11) are fixedly connected by bonding or welding through the connection hole (12); The bonding material used to fix the inner tube (9) and the metal ring (11) is glue or a polymer material, and the glue or polymer material flows into the connection hole (12) to form a physical lock.

8. The laser ablation catheter according to claim 1, characterized in that: The optical fiber bundle (3) in the laser ablation catheter (1) is densely arranged, and its density is expressed as the total area of ​​the optical fiber cavity occupied by the optical fiber, and the density ranges from 0.3 to 0.

95.

9. The laser ablation catheter according to claim 1, characterized in that: The guide wire cavity (4) is arranged inside the outer sleeve (2) and close to a side of the inner cavity wall of the outer sleeve (2); When in use, the laser ablation catheter (1) is driven to rotate along its circumferential direction, and ablates the stenotic position of the blood vessel through the dense end of the optical fiber bundle (3).

10. The laser ablation catheter according to claim 1, characterized in that: The guidewire cavity (4) is arranged in the straight section (13) of the laser ablation catheter (1), and the guidewire outlet (6) and the guidewire inlet (7) of the guidewire cavity (4) are both located in the straight section (13); The optical fiber bundle (3) extends to the tip position of the distal end of the laser ablation catheter (1), and is a circular arrangement structure that covers the tip position of the laser ablation catheter (1), so as to perform concentrated surface ablation on the plaque.

Images