CN215961743U - Guide catheter - Google Patents
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- CN215961743U CN215961743U CN202121959251.4U CN202121959251U CN215961743U CN 215961743 U CN215961743 U CN 215961743U CN 202121959251 U CN202121959251 U CN 202121959251U CN 215961743 U CN215961743 U CN 215961743U
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Abstract
The utility model provides a guiding catheter, which comprises a distal end part and a proximal end part which are arranged from far to near, wherein the distal end part of the guiding catheter comprises at least three bent sections and at least two straight sections, and the bent sections and the straight sections are alternately arranged. The utility model can conform to the arch of the aortic arch with complex anatomical structure by arranging a plurality of alternate bending sections and a plurality of straight sections at the distal part of the guide catheter, so that an operator can easily loop or rotate the guide catheter in the ascending aorta to enter the corresponding branch blood vessel.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to a guide catheter.
Background
At present, the internal carotid artery stent and intracranial stent implantation or spring coil embolization operation are mostly accessed through femoral artery. The nerve interventional operation is carried out through femoral artery, hematoma at puncture position is easily caused, complications such as retroperitoneal hematoma and the like are caused, postoperative wound is large, the recovery of a patient is slow, the patient can get out of bed after lying for a long time, compared with the nerve intravascular treatment operation carried out through femoral artery, the operation treatment carried out through radial artery can effectively reduce the occurrence of complications such as puncture point bleeding, hematoma, pseudoaneurysm, arteriovenous fistula and the like, and the patient does not need to lie in bed to brake after completing the operation, so that the operation is comfortable, and the hospitalization cost is low.
At present, no guide catheter for conveying the internal carotid artery and the intracranial stent or spring ring through the radial artery exists, mainly because the angle from the radial artery to the internal carotid artery is small, for example, in the case of the anatomical structure of a type II arch (the distance from the top tangent line of the aortic arch to the initial part of the head-arm trunk is equal to 2 times of the width of the head-arm trunk) or a type III arch (the type III means that the distance from the top tangent line of the aortic arch to the initial part of the head-arm trunk is equal to 3 times or more of the width of the head-arm trunk), the guide catheter needs to rotate or loop in the blood vessel (such as the guide catheter shown in figure 4, the lowest point of the bending of the catheter is at the bottom of the ascending aorta, and the head end of the support guide catheter points to the head-arm trunk reversely), so that the head end of the catheter can enter the corresponding lesion branch blood vessel; meanwhile, a stable supporting access needs to be provided for other nerve interventional instruments such as a conveying stent and a spring ring, so that the technical requirement on an operator is high, and the related operation risk and the operation ray exposure time are increased to a certain extent. There is a need for a guiding catheter with good torque control, support, and stability, and which can conform to the various aspects of the aortic arch and enter the internal carotid artery. In addition, the visibility of the far end of the guide catheter is also very important, and an operator can visually observe the rotation or loop forming conditions of the far end and the head end of the guide catheter according to the visibility of the far end, so that the operator can conveniently and timely adjust the shape of the guide catheter, and the technical difficulty of entering the path from the radial artery is reduced. Most (transfemoral) guiding catheters currently on the market are usually provided with only one to two visualization points at the tip to identify the position of the distal end of the guiding catheter.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, it is an object of the present invention to provide a guiding catheter that can conform to the arch shape of the aortic arch, which is complicated in anatomical structure, by providing a plurality of curved segments and a plurality of flat segments alternately at the distal end portion of the guiding catheter, so that it is easy for an operator to loop or rotate the guiding catheter in the ascending aorta to enter the corresponding branch vessels.
The embodiment of the utility model provides a guiding catheter, which comprises a distal end part and a proximal end part which are arranged from far to near, wherein the distal end part of the guiding catheter comprises at least three bent sections and at least two straight sections, and the bent sections and the straight sections are alternately arranged.
In some embodiments, the distal portion of the guiding catheter comprises, in order from distal to proximal: the bending device comprises a first bending section, a first straight section, a second bending section, a second straight section, a third bending section and a third straight section, wherein the first bending section, the second bending section and the third bending section are all arc-shaped.
In some embodiments, the angle of the first curved section is obtuse, the angle of the second curved section is acute, and the angle of the third curved section is obtuse.
In some embodiments, the angle of the first curved section is 125 ° to 175 °, the angle of the second curved section is 30 ° to 70 °, and the angle of the third curved section is 165 ° to 175 °.
In some embodiments, the first curved segment has a length of 1cm to 2.5cm, the first curved segment has a length from the midpoint to the midpoint of the second curved segment of 4cm to 16cm, and the second curved segment has a length from the midpoint to the midpoint of the third curved segment of 3cm to 4 cm.
In some embodiments, the second curved segment and the third curved segment each lie in a first plane, and the first curved segment lies in a second plane different from the first plane.
In some embodiments, at least a portion of the guide catheter includes a first intermediate layer and a second intermediate layer, the second intermediate layer being located outside of the first intermediate layer, the first intermediate layer being a spiral wound structure, a cross-woven structure, or a combination of a spiral wound structure and a cross-woven structure, the second intermediate layer being a spiral wound structure, a cross-woven structure, or a combination of a spiral wound structure and a cross-woven structure.
In some embodiments, one of the first and second intermediate layers is in a spirally wound configuration and the other layer is in a cross-woven configuration.
In some embodiments, the first intermediate layer is an integrally molded layer, and the first intermediate layer has a distal end with a stiffness that is lower than a proximal end; and/or the presence of a gas in the gas,
the second intermediate layer is an integrally formed layer, and the rigidity of the distal end of the second intermediate layer is lower than that of the proximal end.
In some embodiments, the guiding catheter further comprises an outer layer located outside the second intermediate layer, the outer layer having a distal end with a lower durometer than a proximal end.
In some embodiments, at least one of the first intermediate layer and the second intermediate layer is a developable metal layer at a location corresponding to at least a portion of the distal end portion.
In some embodiments, at least one of the first intermediate layer and the second intermediate layer is in a spirally wound or cross-woven structure formed using a double layer of wire at a location corresponding to at least a portion of the distal end portion; the double-layer wire comprises an inner metal core and an outer metal layer wrapping the inner metal core, and the inner metal core is a developable metal layer.
In some embodiments, the guiding catheter further comprises an outer layer located outside the second intermediate layer, the outer layer being a layer of polymer material doped with a developer at a location corresponding to at least a portion of the distal portion.
The guide catheter provided by the utility model has the following advantages:
the present invention, by providing alternating curved and straight sections at the distal end of the guiding catheter, can conform to the arch of the aortic arch, which is more complex in anatomical structure, making it easier for the operator to loop or rotate the guiding catheter in the ascending aorta to access the corresponding branch vessels, such as the right common carotid artery, the left common carotid artery, or the left subclavian artery.
Further, in some embodiments, the guiding catheter is at least partially provided with two intermediate layers, each of the two intermediate layers may be a spiral winding structure, a cross-woven structure, or a combination structure of the spiral winding structure and the cross-woven structure, which can provide good support and lumen deformation holding capability for the guiding catheter, can resist kinking (kink) when the device is conveyed in the guiding catheter, and can provide effective arch support for the micro-catheter and the stent product to pass through, thereby avoiding the influence on the conveyance position of the device due to the retraction of the guiding catheter, and providing good stability.
The guide catheter of the utility model can be used not only as a guide catheter for delivering a device into the cranium through the radial artery, but also in other scenes, such as a guide catheter for delivering a device into a cardiac vessel.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a guiding catheter in accordance with an embodiment of the utility model;
FIG. 2 is a schematic cross-sectional view of the distal end of a guiding catheter in accordance with an embodiment of the utility model;
FIG. 3 is a schematic intermediate layer of the distal portion of a guiding catheter in accordance with an embodiment of the utility model;
FIG. 4 is a schematic view of a guiding catheter of an embodiment of the present invention entering the right common carotid artery at the aortic arch;
fig. 5 is a schematic structural view of a guiding catheter according to another embodiment of the utility model.
Reference numerals:
10 guide catheter 12 proximal section of guide catheter
11 guiding the distal end 13 of the catheter
114 first curved section 14 catheter hub
111 first straight section 81 guide wire
115 second bend section 82 coaxial conduit
112 second straight section 91 left common carotid artery
116 third bend 92 left subclavian artery
113 third straight section 93 descending aorta
a inner layer 94 of distal portion of aortic valve
b first middle layer of distal portion 95 ascending aorta
c second middle layer 96 radial artery of distal section
Outer 97 Right common carotid artery at distal end of d
m1Outer metal layer of double-layer wire material
m2Inner metal core of double-layer wire
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. In the specification, "or" may mean "and" or ". In the present invention, for a component, "distal" refers to the end away from the operator and "proximal" refers to the end closer to the operator. For example, in the view of fig. 1, the left side of the guiding catheter is distal and the right side is proximal.
In order to solve the technical problems in the prior art, the utility model provides a guiding catheter, which comprises a distal end part and a proximal end part which are arranged from far to near, wherein the distal end part of the guiding catheter comprises at least three bent sections and at least two straight sections, and the bent sections and the straight sections are alternately arranged. The present invention, by providing alternating curved and straight sections at the distal end of the guiding catheter, can conform to the arch of the aortic arch, which is more complex in anatomical structure, making it easier for the operator to loop or rotate the guiding catheter in the ascending aorta to access the corresponding branch vessels, such as the right common carotid artery, the left common carotid artery, or the left subclavian artery.
In some embodiments, at least a part of the guide catheter comprises a first intermediate layer and a second intermediate layer, the second intermediate layer is located on the outer side of the first intermediate layer, the first intermediate layer is a spiral winding structure, a cross-woven structure or a combination structure of the spiral winding structure and the cross-woven structure, the second intermediate layer is a spiral winding structure, a cross-woven structure or a combination structure of the spiral winding structure and the cross-woven structure, and the first intermediate layer and the second intermediate layer can provide good support and lumen deformation holding capacity for the guide catheter, resist kinking (kink) when the device is conveyed in the guide catheter, provide effective arch support for the passage of microcatheter and stent products, and avoid the problem that the device is conveyed in place due to the fact that the guide catheter is withdrawn due to large resistance when the device is conveyed, and provide good stability.
The structure of the guiding catheter of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the arrangements shown in the drawings and defined in the specific embodiments are exemplary only and not intended as limitations on the scope of the utility model.
As shown in fig. 1, in an embodiment of the present invention, there is provided a guiding catheter 10, comprising a distal portion 11 and a proximal portion 12 arranged from far to near, wherein the distal portion 11 of the guiding catheter 10 comprises at least three curved sections and at least two straight sections, and the curved sections alternate with the straight sections. Specifically, in this embodiment, the distal end portion 11 of the guide catheter 10 includes three curved segments 114, 115, 116 and three straight segments 111, 112, 113, the three curved segments 114, 115, 116 each being arc-shaped. The distal end portion 11 of the guiding catheter 10 comprises, in order from the distal end to the proximal end: the guiding catheter 10 comprises a first bending section 114, a first straight section 111, a second bending section 115, a second straight section 112, a third bending section 116 and a third straight section 113, namely, the most distal end of the guiding catheter 10 is the first bending section 114 rather than the straight section, the most distal end of the guiding catheter 10 has certain reshaping capability due to certain bending radian and the arrangement of high polymer materials on the outer layer, so that the injury to blood vessels can be reduced to a certain extent, and doctors can reshape the bending section 114 to form different angles according to the anatomical forms of different blood vessels, so that the guiding catheter 10 can enter the bifurcation blood vessels with different forms to reach diseased blood vessels. The distal portion 11 may be formed or otherwise shaped by placing the guiding catheter 10 in a PTEE (polytetrafluoroethylene) mold also comprised of a plurality of curved segments alternating with a plurality of straight segments and shaping by heating, for example, by heating a particular location of the distal portion 11 of the guiding catheter 10 to bend and deform it to form a curved segment.
The guiding catheter 10 can be suitable for treating intracranial vascular diseases by radial artery access, and mainly solves the problems in the prior art: while ensuring the clinical performance requirements of the radial artery guiding catheter, the distal end part 11 of the radial artery guiding catheter is difficult to conform to the aortic arch anatomy structure, so that the radial artery guiding catheter is difficult to loop or rotate and cannot enter into intracranial vessels. The present invention, by providing alternating curved and straight sections at the distal end 11 of the guiding catheter 10, can conform to the arch of the more complex anatomical aortic arch, making it easier for the operator to loop or rotate the guiding catheter in the ascending aorta to access the corresponding branch vessels, such as the right common carotid artery, the left common carotid artery, or the left subclavian artery. In addition, the guiding catheter 10 can also be applied to other scenes, such as a guiding catheter for delivering instruments into a cardiac vessel, and the like, so that the difficulty of delivering the guiding catheter in the blood vessel is reduced.
As shown in fig. 1, the proximal end portion 12 of the guide catheter 10 is also provided with a diffusive stress tube 13 and a catheter hub 14. In this embodiment, the angle Φ 1 of the first curved section 114 is obtuse to form a relatively smooth curved structure at the distal most end of the guide catheter 10. Preferably, the angle Φ 1 of the first curved section 114 is 125 ° to 175 °, and further preferably, the angle Φ 1 is 165 ° to 175 °. In this embodiment, the length L1 of the first curved section 114 is 1cm to 2.5cm, preferably 1 cm. The length L1 herein refers to the linear distance between the two ends of the first curved section 14. And a visualization ring may be provided at the most distal position of the first curve segment 114 to identify the tip of the guiding catheter 10 (in the present invention, the tip of the guiding catheter refers to the portion of the guiding catheter that enters the blood vessel first, i.e., the most distal end). The structural design of crooked section is mainly in order to guarantee that the head end has anti elliptical performance, is changeed when the atress and warp and then the power value that the loss arrived the head end to reduce the head end to the damage of vascular wall, avoid damaging the blood vessel.
In this embodiment, the angle of the second curved segment 115 is acute and the angle of the third curved segment 116 is obtuse, so that the second curved segment 115 and the third curved segment 116 are curved in two different directions to better conform to the arch of the more complex anatomical aortic arch. For example, in the perspective of fig. 1, the third curved segment 116 has a downward curved arc and the second curved segment 115 has an upward curved arc. In different embodiments, the bending direction and the bending angle of the three bending sections 114, 115, 116 may be selected as desired. The three curved sections 114, 115, 116 may be in the same plane or in different planes. Preferably, the second curved segment 115 and the third curved segment 116 lie in the same first plane, and the first curved segment 114 lies in a second plane that is not coincident with the first plane, but may be intersecting or parallel. Because the internal carotid artery and the aortic arch or the common carotid artery are not on the same plane, the guiding catheter adopting the structure is more convenient to enter the internal carotid artery. Preferably, the angle Φ 2 of the second bending section 115 is 30 ° to 70 °, and further, the angle Φ 2 is preferably 35 ° to 60 °. Preferably, the angle Φ 3 of the third curved section 116 is 165 ° to 175 °. The length L2 from the midpoint of the first bent segment 114 to the midpoint of the second bent segment 115 is preferably 4cm to 16cm, and the length L2 is more preferably 7cm to 10 cm. The length L3 from the midpoint of the second curved segment 115 to the midpoint of the third curved segment 116 is preferably 3cm to 4 cm. Here, the length L2 refers to a straight line distance from the midpoint of the first bent segment 114 to the midpoint of the second bent segment 115, and the length L3 refers to a straight line distance from the midpoint of the second bent segment 115 to the midpoint of the third bent segment 116.
In the embodiment, the angle and the length of each bending section and the value of the length between the middle points of the adjacent bending sections are reasonably set, so that the guiding catheter which is more suitable for treating intracranial vascular diseases through radial access is obtained, and the arch of the aortic arch with a more complex anatomical structure can be better conformed. However, the values of the angle, the length of each of the bends, and the length between the midpoints of adjacent bends listed above are all optional values, and in other embodiments, the values listed above may be selected, or other values not listed may be selected, so as to obtain different guiding catheter structures, and all fall within the protection scope of the present invention. In applying the guiding catheter to different scenarios, the angle, length of each curve segment, and the value of the length between the midpoints of adjacent curve segments can be designed according to the specific scenario.
Further, in order to balance the relationship between the support, integrity and flexibility of the distal section 11 of the radial artery guiding catheter, reduce operator handling difficulties, and reduce the risk of patient complications, in this embodiment, the layered structure of the guiding catheter is further improved.
As shown in fig. 2, at the first bending section 114 of the guide catheter, the guide catheter comprises an inner layer a, a first intermediate layer b, a second intermediate layer c and an outer layer d which are arranged in sequence from inside to outside. The inner diameter of the guide catheter is 0.050 to 0.090 ", and preferably, the inner diameter thereof is 0.058 to 0.088". The outer diameter of the guiding catheter is 0.06-0.012 ", preferably 0.0788", and the values of the inner and outer diameters are only exemplary, but the utility model is not limited thereto, and other values not included in the above range may be adopted in other embodiments of the utility model. The multilayer structure of the rest of the distal portion 11 of the guiding catheter may be the same as the first curved section 114 in fig. 2, or may be different from the first curved section 114 in fig. 2. The multi-layered construction of the proximal section 12 of the guide catheter may be the same as the first curved segment 114 of fig. 2 or may be a different construction than the first curved segment 114 of fig. 2. In other embodiments of the present invention, the guiding catheter may also comprise only a single intermediate layer, i.e. an inner layer a, an intermediate layer b or c and an outer layer d are arranged in sequence from inside to outside. The layered structure of the distal end portion 11 of the guiding catheter will be described in detail with reference to fig. 2, taking the structure shown in fig. 2 as an example of the distal end portion 11 of the guiding catheter.
In this embodiment, the inner layer a of the guiding catheter is made of a high polymer material with a low friction coefficient, such as a fluoropolymer, such as polytetrafluoroethylene, or a high polymer material, such as high density polyethylene, nylon, or polypropylene. The friction coefficient of the inner layer a is preferably 0.02-0.1, so that the guiding catheter provides a smoother inner surface for the instruments to pass through. The first intermediate layer b is a spiral winding structure, a cross weaving structure or a combined structure of the spiral winding structure and the cross weaving structure, and the second intermediate layer c is a spiral winding structure, a cross weaving structure or a combined structure of the spiral winding structure and the cross weaving structure. Therefore, the first intermediate layer b and the second intermediate layer c can provide good support and lumen deformation holding capacity for the guide catheter, can resist the kink when conveying the device in the guide catheter, can provide effective arch support for the micro-catheter and the bracket products, avoid the influence on the device conveying in place caused by the retraction of the guide catheter due to large resistance when conveying the device, and provide good stability.
The first intermediate layer b and the second intermediate layer c may both be made of a metal material, or both may be made of a polymer material, or one layer may be made of a metal material and the other layer may be made of a polymer material. The metal material used for the intermediate layer b/c may be, for example, a common medical metal material such as stainless steel, nickel-titanium alloy, cobalt-chromium alloy, nickel-cobalt alloy, platinum-tungsten alloy, platinum-iridium alloy, or other platinum alloy. The polymer material used for the intermediate layer b/c may be, for example, a common medical polymer material such as liquid crystal polymer or aramid. Preferably, the first intermediate layer b and the second intermediate layer c are both made of nickel-titanium alloy materials, because the nickel-titanium alloy is a shape memory material, the temperature of a human body is higher than the phase transition temperature Af point of the nickel-titanium alloy, and the materials have super elasticity and can better resist deformation, the lumen shape can be better maintained when passing through a bent blood vessel, the delivery of the instrument can be better supported when the instrument is delivered, and the situation that the guiding catheter is retracted due to resistance generated when the instrument is delivered, and the in-place capability of the instrument is influenced is avoided.
In this embodiment, at least a part of at least one of the first intermediate layer b and the second intermediate layer c is a developable metal layer. Preferably, at least one of the first intermediate layer b and the second intermediate layer c is a developing metal layer at a position corresponding to at least a part of the distal portion 11 of the guiding catheter, for example, a metal material with a high attenuation coefficient under X-ray, such as platinum, gold or tantalum, is used to facilitate an operator to observe the shape of the distal portion 11 in the aorta when the guiding catheter enters the intracranial blood vessel via the radial artery during a surgical procedure, and to adjust the guiding catheter in time, such as rotating or looping, so that the tip end of the guiding catheter can pass through a branch port corresponding to a diseased blood vessel, such as the right carotid artery port, which is beneficial to shorten the surgical time and reduce complications of the patient. The developable metal may be prepared as a wire and then spirally wound or woven to form the first intermediate layer b and/or the second intermediate layer.
At least part of at least one of the first intermediate layer b and the second intermediate layer c is a spiral winding structure or a cross-woven structure formed by double layers of wires. Preferably, at least one of the first intermediate layer b and the second intermediate layer c is a spirally wound structure or a crosswoven structure formed using double-layered wires at a position corresponding to at least a part of the distal end portion 11 of the guide catheter. FIG. 3 shows that the first intermediate layer b is a spiral winding structure b formed by double layers of wires1For the purpose of illustration, it is understood that the structure of the second intermediate layer c may also adopt the structure shown in fig. 3, or other spiral or woven structures different from the structure in fig. 3. The double-layer wire comprises an outer metal layer m1And an outer metal layer m1Wrapped inner metal core m2And the inner metal core is a developable metal. Specifically, the outer metalLayer m1Is nickel-titanium alloy, cobalt-chromium alloy or nickel-cobalt alloy, and inner metal core m2The metal material is a metal material with high attenuation coefficient under X-ray, such as platinum, gold or tantalum, and the radiopacity under X-ray is stronger when the attenuation coefficient is higher. Preferably, the first intermediate layer b and/or the second intermediate layer c of the distal portion 11 comprise a metal material with a higher X-ray attenuation coefficient (higher than the X-ray attenuation coefficient of a material of a proximal portion of the guiding catheter), and the distal portion 11 has better visualization property than the proximal portion, so that an operator can conveniently observe the shape of the distal portion 11 in the aorta when the guiding catheter enters the intracranial blood vessel through the radial artery during the operation, and timely adjust the guiding catheter, such as rotate or loop, so that the head end of the guiding catheter can pass through a branch port of the corresponding diseased blood vessel, such as the right carotid artery port, thereby being beneficial to shortening the operation time and reducing the patient complications. It is further preferable that the developable metal material is used only in the intermediate layer at the midpoint of the three curved sections of the distal end portion 11, that is, the intermediate layer at the midpoint of the three curved sections contains a metal material having a higher X light attenuation coefficient than that at the midpoint of the non-curved section.
In this embodiment, the first intermediate layer b and the second intermediate layer c may be both in a spiral wound structure or both in a cross-woven structure. Preferably, one of the first intermediate layer b and the second intermediate layer c is of a spiral winding structure, and the other layer is of a cross-woven structure, so that the catheter has flexibility, and meanwhile, the catheter provides good support performance and lumen retention capacity, and is not prone to Kink.
In this embodiment, the stiffness of the distal end of the first intermediate layer b is lower than the stiffness of the proximal end, and preferably the stiffness of the first intermediate layer b decreases gradually from the proximal end to the distal end. The stiffness of the distal end of the second intermediate layer c is lower than the stiffness of the proximal end, and preferably the stiffness of the second intermediate layer c decreases gradually from the proximal end to the distal end. The first intermediate layer b and the second intermediate layer c are integrally formed from the far end to the near end instead of being spliced by materials with different rigidities, and the rigidity change of the first intermediate layer b and the second intermediate layer c can be realized by annealing or polishing the first intermediate layer b and the second intermediate layer c. When the annealing treatment is adopted, the far ends of the first intermediate layer b and the second intermediate layer c are annealed, so that the rigidity of the far ends can be reduced; when the polishing treatment is employed, the distal end rigidity of the first intermediate layer b and the second intermediate layer c is reduced by reducing the distal end diameters of the first intermediate layer b and the second intermediate layer c by polishing. Because the rigidity of the first intermediate layer b and the second intermediate layer c is reduced from the near end to the far end, the near end of the guide catheter is guaranteed to be good in support and pushing hand feeling, the far end is low in rigidity, the flexibility of the far end can be improved, the deformation capability of the far end in compliance with blood vessels is improved, and meanwhile, the damage of the far end to the blood vessels is reduced. Meanwhile, the first intermediate layer b and the second intermediate layer c are integrally formed layers respectively, the situation that the pushing performance is influenced by stress barriers caused by splicing of materials with different rigidity can be avoided, the requirements of different supportability, rigidity and compliance are met by one material in a segmented mode through the combination of the structure and the process, and the performances of the supportability, the integrity, the head end softness and the like are well balanced.
In this embodiment, the outer layer d of the guiding catheter can also be made of polymer material, such as medical polymer material like polyamide, polyurethane, etc. Preferably, the outer layer d of the guiding catheter is made of polymer materials with different hardness from the distal end to the proximal end, so that the hardness of the distal end of the outer layer d of the guiding catheter is lower than that of the proximal end. Preferably, the polymer material of the outer layer d at the head end part of the guiding catheter is made of TPU (Thermoplastic polyurethane elastomer) with extremely low hardness, such as TPU with hardness of 40-60A, so as to ensure that the head end of the guiding catheter is soft enough and does not damage blood vessels during the delivery process. In this embodiment, the outer layer d of the guiding catheter is at least partially a layer of polymer material doped with a developer. Preferably, the portion of the outer layer d of the guiding catheter corresponding to the distal end portion 11 is a polymer material layer doped with a developer, such as a polymer material containing a developer such as tantalum, tungsten, gold, barium sulfate, bismuth oxide, etc. The developer-doped outer layer d is combined with the metal material with high X-ray attenuation coefficient (higher than that of the material of the proximal portion) contained in the intermediate layer, so that better developing effect can be achieved, and the operator can more clearly observe the form of the distal portion 11 of the guide catheter in the aortic arch.
The method of use of the transradial access guiding catheter of the present invention is shown in fig. 4. The arterial structure shown in fig. 4 comprises: left common carotid artery 91, left subclavian artery 92, descending aorta 93, aortic valve 94, ascending aorta 95, radial artery 96, and right common carotid artery 97. Generally, in the type ii or type iii arches, since the distance between the tangent of the aortic arch and the opening of the right common carotid artery 97 is equal to or greater than the diameter of the right common carotid artery 97, it is difficult to access the right common carotid artery 97 or the right internal carotid artery from the radial artery 96. With the structure of the guide catheter 10 shown in the embodiment of fig. 1 to 3, after the distal portion 11 of the guide catheter 10 is completely delivered to the aortic arch by using the coaxial technology, the coaxial catheter 82 and the guide wire 81 are withdrawn to the proximal end of the guide catheter 10, and the guide catheter 10 is pushed to make the distal portion 11 loop in the ascending aorta 95 or rotate to make the first bending section 114 at the head end point to the right common carotid artery 97, and then the coaxial catheter 82 and the guide wire 81 are pushed to the far end of the guide catheter 10, at this time, the guide catheter 10 can climb to the right internal carotid artery or the right vertebral artery along the coaxial catheter 82 and the guide wire 81. The structural advantage of distal end portion 11 of this embodiment has been conveniently used to this in-process, makes the operator become the tong "pan" easily and the head end easily gets into right common carotid artery, and the softness of distal end portion 11 can be developed simultaneously, and the operator can observe the form trend of the head end of guide catheter 10 in the aortic arch directly perceivedly so that in time adjust guide catheter, is favorable to shortening operation time, reduces patient's complication, also is difficult for damaging the blood vessel because of the head end is soft during the adjustment. After the guiding catheter 10 reaches the target position, nerve interventional devices such as a stent, a spring ring, a balloon catheter and the like can be conveyed.
Fig. 5 is a schematic structural view of a guiding catheter according to another embodiment of the present invention. This embodiment differs from the embodiment of fig. 1 in that: the angle of each curved segment of the distal end portion 11 of the guiding catheter 10 in fig. 5 is different from the angle of each curved segment in fig. 1. In the embodiment of fig. 5, the angle Φ 1 ' of the first curved section 114 is smaller than the angle Φ 1 of the first curved section 114 in the embodiment of fig. 1, the angle Φ 2 ' of the second curved section 115 is smaller than the angle Φ 2 of the second curved section 115 in the embodiment of fig. 1, and the angle Φ 3 ' of the third curved section 116 in the embodiment of fig. 5 is larger than the angle Φ 3 of the third curved section 116 in the embodiment of fig. 1. The structure of the guiding catheter shown in fig. 1 and the structure of the guiding catheter shown in fig. 5 can be selectively used for the anatomical structures of different patients because the distal end portions thereof have different shapes. In other alternative embodiments, the angle and/or bending direction of each bending section may be adjusted as desired, for example, to use different angles and/or bending directions for different patients, without being limited to those shown in fig. 1 and 5.
The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (13)
1. A guiding catheter comprising a distal portion and a proximal portion arranged from distal to proximal, the distal portion of the guiding catheter comprising at least three curved segments and at least two straight segments, the curved segments alternating with the straight segments.
2. A guide catheter according to claim 1, wherein the distal portion of the guide catheter comprises, in order from distal to proximal: the bending device comprises a first bending section, a first straight section, a second bending section, a second straight section, a third bending section and a third straight section, wherein the first bending section, the second bending section and the third bending section are all arc-shaped.
3. The guide catheter of claim 2, wherein the angle of the first curved segment is obtuse, the angle of the second curved segment is acute, and the angle of the third curved segment is obtuse.
4. The guide catheter of claim 3, wherein the angle of the first curved section is 125 ° -175 °; the angle of the second bending section is 30-70 degrees, and the angle of the third bending section is 165-175 degrees.
5. The guide catheter of claim 2, wherein the first curve segment has a length of 1cm to 2.5cm, the first curve segment has a length from the midpoint to the midpoint of the second curve segment of 4cm to 16cm, and the second curve segment has a length from the midpoint to the midpoint of the third curve segment of 3cm to 4 cm.
6. The guide catheter of claim 2, wherein the second curved segment and the third curved segment each lie in a first plane, the first curved segment lying in a second plane different from the first plane.
7. The guide catheter of claim 1, wherein at least a portion of the guide catheter comprises a first intermediate layer and a second intermediate layer, the second intermediate layer being located outside of the first intermediate layer, the first intermediate layer being a helically wound structure, a cross-woven structure, or a combination of a helically wound structure and a cross-woven structure, the second intermediate layer being a helically wound structure, a cross-woven structure, or a combination of a helically wound structure and a cross-woven structure.
8. The guide catheter of claim 7, wherein one of the first and second intermediate layers is a helically wound structure and the other layer is a cross-woven structure.
9. The guide catheter of claim 7, wherein the first intermediate layer is an integrally formed layer and a distal end of the first intermediate layer has a stiffness that is lower than a stiffness of a proximal end; and/or the presence of a gas in the gas,
the second intermediate layer is an integrally formed layer, and the rigidity of the distal end of the second intermediate layer is lower than that of the proximal end.
10. A guide catheter according to claim 7 or 9, further comprising an outer layer located outside the second intermediate layer, the outer layer having a distal end with a lower stiffness than a proximal end.
11. The guide catheter of claim 7, wherein at least one of the first intermediate layer and the second intermediate layer is a developable metal layer at a location corresponding to at least a portion of the distal end portion.
12. A guide catheter according to claim 7, wherein at least one of the first intermediate layer and the second intermediate layer is in a spirally wound or crosswoven structure formed using a double layer of wire at a position corresponding to at least part of the distal end portion; the double-layer wire comprises an inner metal core and an outer metal layer wrapping the inner metal core, and the inner metal core is a developable metal layer.
13. A guide catheter according to claim 7, 11 or 12, further comprising an outer layer located outside the second intermediate layer, the outer layer being a layer of polymer material doped with a developer at a location corresponding to at least part of the distal portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121959251.4U CN215961743U (en) | 2021-08-19 | 2021-08-19 | Guide catheter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121959251.4U CN215961743U (en) | 2021-08-19 | 2021-08-19 | Guide catheter |
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| Publication Number | Publication Date |
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| CN215961743U true CN215961743U (en) | 2022-03-08 |
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| CN202121959251.4U Active CN215961743U (en) | 2021-08-19 | 2021-08-19 | Guide catheter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115212427A (en) * | 2022-06-21 | 2022-10-21 | 上海心玮医疗科技股份有限公司 | Radial guide catheter |
| CN115624680A (en) * | 2022-12-07 | 2023-01-20 | 艾柯医疗器械(北京)股份有限公司 | System for establishing transcatheter intracranial catheter and transcatheter radial artery access |
| CN115869511A (en) * | 2022-12-01 | 2023-03-31 | 适介医疗科技(广州)有限公司 | Catheter specially used for hyper-selecting left common carotid artery through left radial artery |
| CN116035652A (en) * | 2023-02-09 | 2023-05-02 | 晨兴(南通)医疗器械有限公司 | Introducer, thrombolysis device and method for manufacturing introducer |
| WO2024039381A1 (en) * | 2022-08-19 | 2024-02-22 | Neovasc Medical Ltd. | Guide catheter for flow modifying device |
-
2021
- 2021-08-19 CN CN202121959251.4U patent/CN215961743U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115212427A (en) * | 2022-06-21 | 2022-10-21 | 上海心玮医疗科技股份有限公司 | Radial guide catheter |
| WO2024039381A1 (en) * | 2022-08-19 | 2024-02-22 | Neovasc Medical Ltd. | Guide catheter for flow modifying device |
| CN115869511A (en) * | 2022-12-01 | 2023-03-31 | 适介医疗科技(广州)有限公司 | Catheter specially used for hyper-selecting left common carotid artery through left radial artery |
| CN115624680A (en) * | 2022-12-07 | 2023-01-20 | 艾柯医疗器械(北京)股份有限公司 | System for establishing transcatheter intracranial catheter and transcatheter radial artery access |
| CN116035652A (en) * | 2023-02-09 | 2023-05-02 | 晨兴(南通)医疗器械有限公司 | Introducer, thrombolysis device and method for manufacturing introducer |
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