CN111359077B - Sheath core with quick guide function used in blood vessel interventional operation - Google Patents
Sheath core with quick guide function used in blood vessel interventional operation Download PDFInfo
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- CN111359077B CN111359077B CN202010226106.9A CN202010226106A CN111359077B CN 111359077 B CN111359077 B CN 111359077B CN 202010226106 A CN202010226106 A CN 202010226106A CN 111359077 B CN111359077 B CN 111359077B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/0102—Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/02—General characteristics of the apparatus characterised by a particular materials
- A61M2205/0216—Materials providing elastic properties, e.g. for facilitating deformation and avoid breaking
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Abstract
The utility model relates to a quick guide function's of utensil sheath core that uses in vascular intervention operation, the sheath core still includes the distal end tip section, distal end flexible tube body section, middle fusion tube body section and the near-end rigid section that connect in order from the distal end to the near-end, and near-end rigid section is made by the tubular metal resonator, is provided with the spiral cutting structure at the distal part of tubular metal resonator, and the spiral cutting structure is formed by tubular metal resonator equidistance spiral cutting to the spiral gap of spiral cutting structure widens gradually from the near-end to the distal end direction, fuses the macromolecular material that has the same hardness in spiral cutting structure department, the macromolecular material is filled the spiral gap, spiral cutting structure and macromolecular material form the inner chamber surface smoothness jointly middle fusion tube body section, distal end flexible tube body section and distal end tip section are made by macromolecular material.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a sheath core with a quick guide function used in a vascular intervention operation.
Background
The stroke is one of the most serious diseases which are currently harmful to human beings, has become the main lethal cause of China, and has the characteristics of high morbidity, high disability rate, high mortality and high recurrence rate. Acute ischemic stroke is one of the most common types of stroke. After an acute ischemic stroke, a number of neurons, synapses and fibers of the medulla will die every minute before blood flow to the brain tissue is restored. Even if collateral circulation is established, the blood flow of the penumbra and brain tissue is restored through reperfusion therapy, the infarct area is reduced, and nerve damage is improved. Therefore, the primary treatment for acute ischemic stroke is reperfusion therapy, including arterial and venous thrombolysis, mechanical embolectomy, stent placement, and other methods. Among them, direct thrombus aspiration therapy has proven to be as safe and feasible as stent embolectomy therapy. The key to treating ischemic stroke is the recanalization of blood vessels, and the quicker the treatment occasion is, the better the treatment occasion is. This means that during the operation of thrombus aspiration to treat acute stroke, it is extremely important that the distal end of the aspiration catheter can be safely and quickly delivered to the location of the thrombus.
Due to the physiological structure of the tortuous cerebral vessels, and the limitations of the current surgical instruments in terms of selectivity and design, the delivery modes of the guide wire + the suction catheter or the guide wire + the microcatheter + the suction catheter are common, and the modes are found to be difficult to meet the requirements, especially for the distal end of the suction catheter to smoothly go over the tortuous vessel bifurcation and often require doctors to have excellent skill and abundant personal experience. Otherwise, repeated withdrawal and pushing of the interventional instrument within the vessel will undoubtedly increase the risk of complications.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sheath core with a quick guide function used in a vascular intervention operation.
The purpose of the invention is realized by the following technical scheme:
a sheath core with a quick guiding function used in a vascular intervention operation comprises a far-end opening, a near-end opening and a lumen extending from the far-end opening to the near-end opening, the sheath core further comprises a far-end tip section, a far-end flexible pipe body section, an intermediate fusion pipe body section and a near-end rigid section which are connected in sequence from the far end to the near end, the near-end rigid section is made of a metal pipe, a spiral cutting structure is arranged at the far-end part of the metal pipe, the spiral cutting structure is formed by spirally cutting the metal pipe at equal intervals, the spiral gap of the spiral cutting structure is gradually widened from the near end to the far end, a high polymer material is fused at the spiral cutting structure, the high polymer material is a high polymer material with the same hardness, the high polymer material fills the spiral gap, and the spiral cutting structure and the high polymer material together form the intermediate fusion pipe body section with a smooth inner lumen surface, the distal flexible tube section and the distal tip section are both made of a polymeric material.
The purpose of the invention can be further realized by the following technical scheme:
in one embodiment, the helical cutting structure is further extended and helically cut equidistantly from the metal tube from which the proximal rigid section is made.
In a preferred embodiment, the polymeric material fused to the helical cutting structure extends proximally at least a distance covering the outer surface of the proximal rigid section.
In one embodiment, the distal tip section is a tapered structure. In a preferred embodiment, the proximal portion of the distal tip segment has an outer diameter dimension that radially matches an inner diameter dimension of a conventional interventional catheter such that its outer diameter dimension is 0.001 inches to 0.010 inches smaller than the inner diameter of the conventional interventional catheter.
In one embodiment, the polymer materials with the same hardness are made of the same material with the same hardness, or the polymer materials are made of different materials with the same hardness. The same material not only comprises a material made of a single component, but also comprises a material formed by combining different components according to different proportions.
In a preferred embodiment, the polymeric material includes, but is not limited to, PEBAX, PU, TPU, PE, TPE, NYLON.
In one embodiment, the outer diameter of the distal flexible tubular body segment is configured to be 0.001 to 0.010 inches smaller than the inner diameter of a common interventional catheter to allow the sheath-core to traverse within the common interventional catheter lumen.
In one embodiment, 10% to 40% of a developer, including but not limited to barium sulfate, bismuth oxide, is mixed into the polymeric material from which the distal tip section is made.
In one embodiment, 10% to 40% of a contrast agent, including but not limited to barium sulfate, bismuth oxide, is mixed in both the polymeric material making the distal tip section and the polymeric material making the distal portion of the distal flexible tube body section.
In one embodiment, the outer diameter of the distal flexible tube body segment is the same as the outer diameter of the intermediate fused tube body segment.
In one embodiment, the distal portion of the distal flexible tube body segment has an outer diameter greater than an outer diameter of the intermediate fused tube body segment.
In one embodiment, a handle is provided at the proximal end of the sheath core.
In one embodiment, the polymeric material from which the distal flexible tube segment and distal tip segment are made and the polymeric material fused to the helical cutting structure contain 5% to 40% of a lubricity enhancing additive, preferably Mobilize, a product of custom Compounding Solutions, usa.
In one embodiment, the inner diameter of the sheath core is configured to be 0.001 to 0.010 inches larger than the outer diameter of a conventional medical guidewire to allow the conventional medical guidewire to traverse the lumen.
In a preferred embodiment, the inner cavity of the sheath core is of a reducing structure, and the diameter of the middle part of the inner cavity is larger than that of the distal part of the inner cavity.
In one embodiment, the outer diameter of the sheath-core is configured to be smaller than the inner diameter of a common interventional catheter to allow the sheath-core to traverse within the lumen of the common interventional catheter.
In the above embodiment, the metal tube is made of stainless steel or nitinol.
Compared with the prior art, the invention has the following advantages:
1. the spiral cutting structure is arranged on the middle fusion tube body section of the sheath core with the rapid guiding function used in the vascular interventional operation, the thread pitches of the spiral cutting structure are equal, the thread gaps are gradually widened from the near end to the far end, the thread gaps are filled with the high polymer materials with the same hardness, the flexible performance of continuous, uniform and transitional change is provided, the force transmission is facilitated, the flexibility of the sheath core is gradually and uniformly increased from the near end to the far end, and the sheath core can conveniently pass through tortuous blood vessels.
2. The design of the proximal rigid section of the sheath core provides sufficient pushing force.
3. The outer diameter of the distal flexible section of the sheath core is configured to be only 0.001 to 0.010 inches smaller than the inner diameter of a common interventional catheter, so that the inner diameter of the common interventional catheter and the outer diameter of the distal flexible section are close in size, and the guiding effect of the distal tip section makes the distal end of the common interventional catheter (such as an aspiration catheter) not easy to be stuck at a blood vessel bifurcation and facilitates the catheter to pass through the tortuous blood vessel bifurcation. Meanwhile, the inner surface of the sheath-core inner cavity extends smoothly, so that a guide wire can conveniently pass through the sheath-core inner cavity.
4. The outer diameter of the distal end portion of the distal flexible tube body section is larger than the outer diameter of the intermediate fusion tube body section, so that friction between the sheath core and a common interventional catheter can be reduced, and operation of an operation is facilitated.
Drawings
Fig. 1 is a schematic cross-sectional view of a distal portion of a sheath-core of the present invention.
Fig. 2 is a schematic view of the spiral cutting structure of the sheath core of the present invention.
Fig. 3 is a schematic view of the structure of the distal portion of the sheath-core of the present invention.
Fig. 4 is a schematic view of an embodiment of the lumen structure of the sheath-core of the present invention.
Fig. 5 is a schematic view of another embodiment of the lumen structure of the sheath-core of the present invention.
Fig. 6 is a schematic view of an embodiment of the sheath-core of the present invention used with a conventional interventional catheter.
Fig. 7 is a schematic view of another embodiment of the sheath-core of the present invention used with a conventional interventional catheter.
Fig. 8a-8d are schematic views of the delivery pattern of a conventional device.
FIG. 9 is a schematic view of the delivery of the sheath-core of the present invention.
Fig. 10a and 10b are schematic views of the relative positions of the sheath-core distal end and the guidewire.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The term "proximal" and "distal" as used herein refer to the relative distance between the interventional medical device and the operator during use, with the proximal end being the end closer to the operator and the distal end being the end farther from the operator.
As shown in fig. 1, a sheath core 1 with a fast guiding function for use in a vascular interventional procedure, the sheath core 1 comprising a distal opening 8, a proximal opening 9 and a lumen 10 extending from the distal opening 8 to the proximal opening 9, the sheath core 1 further comprising, from the distal end to the proximal end, a distal tip section 2, a distal flexible tube section 3, an intermediate fused tube section 4 and a proximal rigid section 5 connected in sequence, the proximal rigid section 5 being made of a metal tube 11, a spiral cutting structure 12 being provided at a distal end portion of the metal tube 11, the spiral cutting structure 12 being formed by equally spirally cutting the metal tube, and a spiral gap of the spiral cutting structure 12 gradually widening from the proximal end to the distal end, a polymer material being fused at the spiral cutting structure 12, the polymer material being a polymer material with the same hardness, the polymer material filling the spiral gap, the helical cutting structure 12 and the polymer material together form the intermediate fused tube segment 4 having a smooth inner lumen surface, and the distal flexible tube segment 3 and the distal tip segment 2 are made of a polymer material.
In one embodiment, a handle 6 is provided at the proximal end of the sheath core 1, a luer 7 is provided at the proximal opening 9, and the distal tip section 2 is of a tapered structure. In a preferred embodiment, the proximal portion of the distal tip section 2 has an outer diameter dimension that matches the inner diameter dimension of a conventional interventional catheter such that its outer diameter dimension is 0.001 inch to 0.010 inch smaller than the inner diameter of a conventional interventional catheter. The outer diameter of the distal flexible body segment 3 is configured to be 0.001 to 0.010 inches smaller than the inner diameter of a conventional interventional catheter to allow the sheath-core 1 to traverse within the lumen of the conventional interventional catheter. The outer diameter of the distal flexible section 3 of the sheath core 1 is configured to be only 0.001 inch to 0.010 inch smaller than the inner diameter of a common interventional catheter, so that the inner diameter of the common interventional catheter and the outer diameter of the distal flexible section 3 are close in size, and the guiding function of the distal tip section 2 is added, so that the distal end of the common interventional catheter (such as a suction catheter) is not easy to be stuck at a blood vessel bifurcation, and the catheter can conveniently pass through the tortuous blood vessel bifurcation. Meanwhile, the inner surface of the inner cavity of the sheath core 1 extends smoothly, so that a guide wire can pass through the inner surface conveniently.
In one embodiment, 10% to 40% of a developer, including but not limited to barium sulfate, bismuth oxide, is mixed in the polymer material from which the distal tip section 2 is made.
In another embodiment, 10% to 40% of a contrast agent, including but not limited to barium sulfate, bismuth oxide, is mixed in both the polymeric material making the distal tip section 2 and the polymeric material making the distal flexible tube section 3 distal portion.
In one embodiment, the polymeric material from which the distal flexible tube section 3 and distal tip section 2 are made and the polymeric material fused to the helical cutting structure 12 contain 5% to 40% of a lubricity enhancing additive, preferably Mobilize, a product of custom Compounding Solutions, usa. In other embodiments, other medical grade lubricious additives may also be used in the polymeric material.
In one embodiment, as shown in fig. 2, the helical cutting structure 12 is further extended and helically cut at equal intervals from the metal tube 11 from which the proximal rigid section 5 is made. The distal end portion of the metal tube 11 is a spiral cutting structure 12, the proximal end portion 13 of the metal tube 11 which is not spirally cut is the proximal rigid segment 5, and the metal tube 11 provides sufficient rigidity and pushing force for the proximal rigid segment 5. The helical cutting structure 12 of the metal tube 11 is a constant pitch helix (i.e. the pitch is equal to a), and the helical clearance C (helical clearance is the clearance between the metal bodies of the helical cutting structure 12) of the helical cutting structure 12 gradually widens from the proximal end to the distal end, that is, the width B of the helical metal body of the helical cutting structure gradually narrows from the proximal end to the distal end.
As shown in fig. 3, the intermediate fused tube section 4 of the sheath-core 1 is formed by co-fusing a polymer material with the helical cutting structure 12 of the distal end portion of the metal tube 11, and the polymer plastic fills the helical clearance C to form a tube body. The inner surface of the tube is smooth (not shown). In one embodiment, the polymeric material fused to the helical cutting structure 12 extends proximally at least a distance covering the outer surface of the distal portion of the proximal rigid segment 5. The high polymer material fused with the spiral cutting structure is a high polymer material with the same hardness. The high polymer materials with the same hardness are made of the same material with the same hardness, or the high polymer materials are made of different materials with the same hardness. The same material not only comprises a material made of a single component, but also comprises a material formed by combining different components according to different proportions. That is, the polymer material in the intermediate fusion pipe section 4 is integrally made of the same hardness material, rather than being formed by splicing different hardness materials in sections. In one embodiment, the outer surface of the proximal rigid section 5 is covered with a polymer material, which may be the same or different from the polymer material at the intermediate fused tube section 4.
The polymer material of the present invention includes but is not limited to PEBAX, PU, TPU, PE, TPE, NYLON.
Conventional catheters are typically fabricated by splicing together polymeric plastic tubing of different stiffness (e.g., PEBAX series of materials of different stiffness) to achieve a change in flexibility. Because the hardness of PEBAX materials of different models is not completely approximate, the hardness of the PEBAX materials is usually changed in a step-by-step mode by splicing the high polymer plastic pipes, so that the flexibility of continuous uniform transition change is difficult to obtain. The present invention is different in that the spiral cutting structure is fused with the high polymer material with the same hardness, and the constant pitch design of the spiral cutting structure 12 and the gradually and uniformly changing characteristic of the spiral clearance C are utilized to fuse the high polymer material in the clearance and form a tube body with a smooth inner cavity surface, so that the transmission of pushing force is facilitated, and the flexibility of the continuous and uniform transition change of the middle fusion tube body section 4 of the sheath core 1 is provided. Understandably, the intermediate fusion tube section 4 of the sheath-core 1 of the present invention can also be designed by adjusting the pitch of the helical cutting structure 12 and the width of the thread clearance C to obtain different flexibility properties. For example, the pitch of the spiral cutting structure 12 is changed to a non-equivalent pitch design according to different use requirements, and the width of the thread clearance C is changed to a design of a non-continuous uniform change design, so as to obtain the flexibility performance of the non-continuous uniform transition change.
As shown in fig. 4, the diameter of the inner lumen 10 of the sheath core 1 can be configured to be 0.001 inch to 0.010 inch larger than the outer diameter of a conventional medical guidewire, such as 0.012 inch, 0.014 inch, 0.018 inch, 0.035 inch, 0.038 inch, etc., and the diameter of the inner lumen 10 is preferably between 0.013 inch and 0.040 inch to allow a conventional medical guidewire to pass through the inner lumen. As shown in fig. 10a and 10b, the inner diameter of the sheath-core 1 of the present invention is only slightly larger than the outer diameter of the guide wire 23, so as to avoid the sheath-core being unable to advance because its distal end is stuck at the apex of the bifurcation due to the larger outer diameter when the sheath-core is advanced along the guide wire. The outer diameter of the distal flexible section of the sheath core of the invention is as large as the inner diameter of the common interventional catheter, and the inner diameter of the most distal end of the sheath core is as small as the outer diameter of the guide wire 23, so as to ensure that the most distal end of the sheath core can easily pass through the bifurcation of the blood vessel after the distal end of the guide wire passes through the bifurcation of the blood vessel during the operation, and the distal flexible section 3 and the common interventional catheter can easily pass through the bifurcation of the blood vessel under the guidance of the distal tip section 2 of the sheath core 1.
As shown in fig. 5, the inner cavity 10 of the sheath core 1 is a tapered structure, and the diameter of the middle section of the inner cavity 10 is larger than the diameter of the distal end section of the inner cavity 10. In one embodiment, the diameter of the distal portion 14 of the lumen 10 can be configured to be 0.001 inch to 0.010 inch larger than the outer diameter of a conventional medical guide wire to allow the conventional medical guide wire to traverse the lumen 10, the proximal portion 15 of the lumen 10 has a larger diameter than the distal-most portion 14, a transition section 16 is disposed therebetween, the diameter of the transition section 16 is larger than the diameter of the distal portion 14 and smaller than the diameter of the proximal portion 15, and in a preferred embodiment, the transition section 16 is also configured to be a reducing structure.
As shown in fig. 6, sheath-core 1 is typically used with a conventional interventional catheter 17 (not shown in its full construction). In one embodiment, the outer diameter of the distal flexible segment 3 of the sheath-core 1 is configured to be 0.001 inch to 0.010 inch smaller than the inner diameter of the conventional interventional catheter 17 to allow the sheath-core 1 to pass through the lumen of the conventional interventional catheter 17.
In one embodiment, the outer diameter of the distal flexible tube body section 3 is the same as the outer diameter of the intermediate fused tube body section 4. In another embodiment, as shown in fig. 7, the outer diameter of the distal portion of the distal flexible tube segment 3 of the sheath-core 1 is larger than the outer diameter of the intermediate fused tube segment 4. A transition section 18 is provided between the distal flexible pipe section 3 and the intermediate fused pipe section 4. The outer diameter of the distal end portion of the distal flexible tube body section is larger than the outer diameter of the intermediate fusion tube body section, so that friction between the sheath core and a common interventional catheter can be reduced, and operation of an operation is facilitated.
During operation, the sheath-core of the present invention is used with a guidewire 23 and a suction catheter 21. Whereas the prior art generally uses a microcatheter 22 in combination with a guidewire 23 and an aspiration catheter 21, fig. 8a shows the conventional delivery of "guidewire 23+ microcatheter 22+ aspiration catheter 21" in a bifurcated vessel 19, for example, the aspiration catheter 21 uses Penumbra ACE68 aspiration catheter (the distal end has an inner diameter of 0.068 inch), the microcatheter 22 uses a Headway microcatheter (the distal end has an outer diameter of 2F, i.e., 0.026 inch), three states as shown in fig. 8b to 8D are possible due to the excessive fit clearance between the microcatheter 22 and the aspiration catheter 21, when the situation as shown in fig. 8b and 8c occurs, the aspiration catheter 21 is stuck at the corner of the vessel bifurcation 20 due to the excessive clearance D and clearance E, and the distal end of the aspiration catheter 21 cannot easily go on beyond the tortuous vessel bifurcation 20, thereby causing the physician to need to operate repeatedly, until the situation shown in fig. 8d occurs, in which the gap F is relatively small, the distal end of the suction catheter 21 cannot be moved relatively easily over the tortuous vessel bifurcation 20 by the suction catheter 21. Since the operator has no control over the relative positions of the aspiration catheter 21 and the microcatheter 22 during the procedure, repeated attempts by the surgeon are required to achieve the desired state as shown in fig. 8d, which increases the time and difficulty of the procedure. The present invention is different from the above-mentioned, as shown in fig. 9, when a "guide wire 23+ sheath core 1+ aspiration catheter 21" is used for delivery in the bifurcated vessel 19, for example, the aspiration catheter 21 is a Penumbra ACE68 aspiration catheter (the distal end inner diameter is 0.068 inches), and the outer diameter of the distal flexible tube section 3 of the sheath core 1 used in conjunction with it is configured to be about 0.005 inches smaller than the distal end inner diameter of the aspiration catheter 21, because the fit gap between the aspiration catheter 21 and the distal flexible tube section 3 of the sheath core 1 is small, and the distal tip section 2 of the sheath core 1 is used for guiding, both can be delivered forward simultaneously (when the relative positions of the sheath core 1 and the aspiration catheter 21 are fixed, the distal end orifice of the aspiration catheter 21 is always located on the distal flexible tube section 3 of the sheath core 1), that is, the outer diameter of the flexible tube section 3 of the sheath core 1 is only a little smaller than the inner diameter of the conventional interventional catheter, so as to ensure the condition shown in fig. 8d, the aspiration catheter 21 can be easily passed through a vascular bifurcation and the aspiration catheter 21 can have a continuous uniform transition of flexibility by virtue of the particular structural design of the intermediate fused tube segment 4 of the sheath-core 1 of the present invention, such a delivery configuration allows the distal end of the aspiration catheter 21 to be advanced relatively easily over a tortuous vascular bifurcation 20, reducing the need for the physician's personal experience and skill.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.
Claims (10)
1. A sheath-core with a rapid guiding function for use in vascular intervention surgery, the sheath-core comprising a distal opening, a proximal opening and a lumen extending from the distal opening to the proximal opening, characterized in that the sheath-core further comprises a distal tip section, a distal flexible tube body section, an intermediate fusion tube body section and a proximal rigid section connected in sequence from the distal end to the proximal end, the proximal rigid section is made of a metal tube, a spiral cutting structure is arranged on the distal end portion of the metal tube, the spiral cutting structure is formed by equidistant spiral cutting of the metal tube, and a spiral gap of the spiral cutting structure gradually widens from the proximal end to the distal end, a polymer material is fused at the spiral cutting structure, the polymer material is a polymer material with the same hardness, the polymer material fills the spiral gap, the spiral cutting structure and the polymer material together form the intermediate fusion tube body section with a smooth lumen surface, the outer diameter of the distal portion of the distal flexible tube body segment is greater than the outer diameter of the intermediate fusion tube body segment, the outer diameter of the distal flexible tube body segment is configured to be 0.001 to 0.010 inches smaller than the inner diameter of a conventional interventional catheter, and the distal flexible tube body segment and the distal tip segment are both made of a polymeric material.
2. The sheath core with the rapid guiding function used in the vascular interventional procedure as claimed in claim 1, wherein the spiral cutting structure is further extended and spirally cut at equal intervals from the metal tube of which the proximal rigid section is made.
3. A sheath core with a rapid guiding function for use in vascular interventional procedures as set forth in claim 1, wherein the polymer material fused with the helical cutting structure extends proximally at least a distance covering the outer surface of the proximal rigid section.
4. The sheath core with the rapid guiding function used in the vascular interventional procedure as claimed in claim 1, wherein the distal tip section is a tapered structure.
5. The sheath core with the function of rapid guiding for vascular interventional operation as claimed in claim 1, wherein 10-40% of the imaging agent including but not limited to barium sulfate and bismuth oxide is mixed in the polymer material forming the distal tip section.
6. A sheath-core with a fast guiding function for use in vascular interventional procedures as claimed in claim 5, characterized in that 10-40% of a visualization agent is mixed in the polymer material making up the distal part of the distal flexible tube body segment, the visualization agent including but not limited to barium sulfate, bismuth oxide.
7. A sheath-core with rapid guiding function for use in vascular interventional procedures as in claim 1, characterized in that the outer diameter of the distal flexible tube body segment is the same as the outer diameter of the intermediate fused tube body segment.
8. The sheath core with a rapid guiding function for use in vascular interventional procedures as claimed in claim 1, wherein additives for improving lubricity are contained in the polymer material forming the distal flexible tube body segment and the distal tip segment and in the polymer material fused with the helical cutting structure in an amount of 5% to 40%.
9. The sheath core with the rapid guiding function used in the vascular interventional procedure according to claim 1, wherein an inner diameter of the sheath core is configured to be 0.001 to 0.010 inches larger than an outer diameter of a commonly used medical guidewire.
10. The sheath core with the function of rapid guiding for vascular interventional operation as claimed in claim 9, wherein the lumen of the sheath core is of a diameter-variable structure, and the diameter of the middle lumen section is larger than that of the distal lumen section.
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| CN202010226106.9A CN111359077B (en) | 2020-03-16 | 2020-03-16 | Sheath core with quick guide function used in blood vessel interventional operation |
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| CN113893435A (en) * | 2021-10-14 | 2022-01-07 | 艾柯医疗器械(北京)有限公司 | Medical catheter |
| CN113908403B (en) * | 2021-12-15 | 2022-03-29 | 艾柯医疗器械(北京)有限公司 | Intracranial catheter |
| WO2023125031A1 (en) * | 2021-12-31 | 2023-07-06 | 先健科技(深圳)有限公司 | Sheath core assembly and delivery instrument |
| CN115737010B (en) * | 2022-12-09 | 2024-04-19 | 上海珩畅医疗科技有限公司 | Dilator for interventional therapy equipment |
| CN117618738B (en) * | 2023-12-09 | 2024-05-28 | 心岭医疗科技(无锡)有限公司 | Neurovascular catheter with groove structure |
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| CN204352347U (en) * | 2014-12-09 | 2015-05-27 | 孙小薇 | Stagewise flexible gradual change blood vessel microtubular |
| CN205514708U (en) * | 2016-01-25 | 2016-08-31 | 中国人民解放军第四军医大学 | Little pipe of external diameter and hardness gradual change |
| CN113350657A (en) * | 2016-02-24 | 2021-09-07 | 禾木（中国）生物工程有限公司 | Neurovascular catheter with enhanced flexibility |
| CN206896587U (en) * | 2017-01-04 | 2018-01-19 | 临沂市兴华医用器材有限公司 | A kind of spiral wire reinforced segmental epidural catheter of flexible antisitic defect |
| CN207341741U (en) * | 2017-01-13 | 2018-05-11 | 上海安清医疗器械有限公司 | A kind of gradual change soft tube and insertion tube and endoscope with the pipe |
| CN108355226A (en) * | 2018-01-30 | 2018-08-03 | 张利勇 | A kind of microtubular for vascular interventional treatment |
| CN108969872A (en) * | 2018-09-28 | 2018-12-11 | 南京普微森医疗科技有限公司 | A kind of balloon guide catheter |
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