CN221286600U - Radial guiding catheter assembly - Google Patents

Abstract

The utility model provides a radial guiding catheter assembly, which relates to the technical field of medical equipment and comprises an outer tube, an inner tube and a guiding guide wire, wherein the outer tube comprises a first outer tube section, a second outer tube section and a third outer tube section which are sequentially connected, the first outer tube section is connected with a first pushing handle, and the hardness of the first outer tube section and the hardness of the third outer tube section are lower than those of the second outer tube section; the inner tube includes a distal end, a proximal end, and a second pushing handle, the distal end being pre-shaped. The utility model enhances the supportability of the outer tube on the aortic arch by arranging the second outer tube section with higher hardness between the first outer tube section and the third outer tube section of the outer tube, improves the super-selective positioning capability of the guide catheter and improves the stability by adjusting the shapes and the hardness of the outer tube, the inner tube and the guide wire, and can replace the traditional guide catheter to be used for the nerve interventional treatment of the radial artery access.

Description

Radial guiding catheter assembly

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a radial guiding catheter assembly.

Background

The femoral artery access cerebral blood vessel is the most commonly used access way in the prior neural intervention, the femoral artery has shallow position, obvious pulsation and relatively simple operation, but the access way has certain defects, such as hematoma, arteriovenous fistula and the like at the puncture part, which are easy to cause. Compared with the femoral artery access, the radial artery access cerebral vascular surgical intervention mode has the advantages of reducing surgical complications, improving comfort level of patients and the like.

However, due to the limitations of surgical instruments and the habit of operators, the surgical intervention mode of the radial artery access cerebral vessels has not been widely popularized clinically. At present, most guiding catheters used clinically in operations of cerebral vessels via radial artery access are catheters used via femoral artery access, and the following situations can occur when the catheters are used via radial artery access: 1. the three large blood vessels on the aortic arch have large included angles among the brachiocephalic trunk, the left common carotid artery and the left subclavian artery, and the guide catheter is required to be bent at a large angle for super-selection, so that the catheter is easy to fold; 2. the support of the catheter is insufficient, so that the situation that the catheter cannot stably pass through and falls into the aortic arch easily occurs during operation, and the operation risk is increased.

Patent CN214907851U published in 2021 provides a transradial access cerebral vascular access cannula assembly that uses a rigid outer cannula that can be well supported on the aortic arch and a softer intermediate access catheter that can be advanced and selected for a branch vessel relatively easily under the guidance of a guidewire. The rigid outer sleeve employed in this approach, while beneficial for achieving support forces on the aortic arch, tends to cause deformation and withdrawal of the softer intermediate access catheter.

Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

The utility model aims to provide a radial guiding catheter assembly, which has the advantages of difficult folding and good support, so as to solve the problem of insufficient support of the existing guiding catheter during radial artery access.

In order to achieve the above object, the present utility model provides the following technical solutions:

a transcatheter guide catheter assembly comprising an outer tube, an inner tube, and a guide wire, wherein:

The outer tube comprises a first outer tube section, a second outer tube section and a third outer tube section which are sequentially connected, the first outer tube section is connected with a first pushing handle, and the hardness of the first outer tube section and the hardness of the third outer tube section are lower than those of the second outer tube section;

The inner tube includes a distal end, a proximal end, and a second pushing handle, the distal end being pre-shaped.

Preferably, the second outer pipe section is arc-shaped, and the axes of the first outer pipe section and the third outer pipe section are not parallel.

Preferably, a bending section is arranged at one end of the third outer pipe section far away from the second outer pipe section, and the included angle between the axes of the bending section and the third outer pipe section is 90-180 degrees.

Preferably, the preformed portion of the distal end of the inner tube has a hardness that is higher than the hardness of the proximal end.

Preferably, the head end of the guiding guide wire is provided with a flexible section, and the hardness of the flexible section is lower than that of other parts of the guiding guide wire.

Preferably, the length of the third outer pipe section is 10-40 cm.

Preferably, the length of the second outer pipe section is 10-20 cm.

Preferably, the length of the flexible section is 8-12 cm.

Preferably, the guide wire comprises a guide wire body and a flexible section which are connected, wherein the guide wire body and the flexible section are respectively made of materials with different hardness.

Preferably, the guiding guide wire comprises an integrated guide wire body and a flexible section, wherein a hard coating is arranged on the surface of the guide wire body, and no hard coating is arranged on the surface of the flexible section;

Or the surfaces of the guide wire body and the flexible section are provided with hard coatings, and the thickness of the hard coatings on the surfaces of the flexible section is lower than that of the guide wire body.

Preferably, the total length of the outer tube is 80-130 cm.

The beneficial effects are that:

(1) According to the utility model, the second outer pipe section with higher hardness is arranged between the first outer pipe section and the third outer pipe section of the outer pipe, so that the support of the outer pipe on the aortic arch is enhanced, the third outer pipe section of the outer pipe is a hose, the outer pipe is easier to guide in place, the inner pipe is not deformed and retracted, the end part of the third outer pipe section is provided with the bending section, when the outer pipe moves along the inner pipe to the far end of the inner pipe, the bending section can conform to the turning of the blood vessel to facilitate conveying the outer pipe, and meanwhile, the function of preventing the inner pipe from deforming and retracting can be also realized;

(2) The hardness of the distal end pre-shaping part of the inner tube is higher than that of other parts, and after the distal end of the inner tube reaches the aortic arch, the supportability of the distal end of the inner tube on the vessel of the aortic arch can be increased;

(3) The flexible section is arranged at the distal end of the guide wire, so that the trafficability of the head end of the guide wire is improved, and the vascular targeting capability of the guide wire can be enhanced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. Wherein:

Fig. 1 is a schematic view of a radial guide catheter assembly according to an embodiment of the present utility model.

Fig. 2 is an enlarged view of the distal end structure of the outer tube.

Fig. 3 is an enlarged view of the distal end structure of the inner tube.

Fig. 4 is a schematic view of a guidewire in an embodiment of the utility model.

In the figure: 100. an outer tube; 101. a first outer tube section; 102. a second outer tube section; 103. a third outer tube section; 104. a first pushing handle; 105. bending sections; 200. an inner tube; 201. a second pushing handle; 202. a first curved section; 203. a first straight line segment; 204. a second curved section; 205. a second straight line segment; 206. a third curved section; 300. a guide wire; 301. a flexible section; 302. a guide wire body.

Detailed Description

The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the utility model, fall within the scope of protection of the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may explicitly or implicitly include one or more features.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, and for example, it may be a fixed connection or an active connection, or it may be a detachable connection or a non-detachable connection, or it may be an integral connection; may be mechanically connected, may be electrically connected, or may be in communication with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements, indirect communication or interaction relationship between the two elements.

In the description of the present utility model, "proximal" refers to the end that is closer to the operator and "distal" refers to the end that is farther from the operator.

The present utility model will be described in detail with reference to examples. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

Aiming at the problem that the supporting property is insufficient when the current guiding catheter passes through the radial artery access, the utility model provides a radial guiding catheter assembly, which comprises an outer tube 100, an inner tube 200 and a guiding guide wire 300, wherein the outer tube 100 and the inner tube 200 are hollow round tubes, and the outer side of the guiding guide wire 300 is sequentially sleeved with the inner tube 200 and the outer tube 100 in the using process.

As shown in fig. 1, the outer tube 100 includes a first outer tube segment 101, a second outer tube segment 102 and a third outer tube segment 103 connected in sequence, wherein the first outer tube segment 101 is connected with a first pushing handle 104, the hardness of the first outer tube segment 101 and the hardness of the third outer tube segment 103 are lower than those of the second outer tube segment 102, the outer tube 100 is easier to guide in place by adopting the third outer tube segment 103 made of softer materials, the inner tube 200 is not deformed and retracted, and the second outer tube segment 102 made of harder materials can enhance the supportability of the outer tube 100 on the aortic arch.

The materials of the first outer tube section 101, the second outer tube section 102 and the third outer tube section 103 can be pebax, nylon and the like, and are made of the materials with different hardness, and then are connected together through a thermal shrinkage method and the like, so that the second outer tube section 102 has higher hardness relative to the first outer tube section 101 and the third outer tube section 103.

In some embodiments, the second outer tube segment 102 having a higher hardness than the first outer tube segment 101 and the third outer tube segment 103 may also be obtained by: the first outer pipe section 101, the second outer pipe section 102 and the third outer pipe section 103 are made of the same material, and a wire mesh is arranged at the second outer pipe section 102 around the axis thereof so as to improve the hardness of the second outer pipe section 102; for example, the first outer tube section 101, the second outer tube section 102, and the third outer tube section 103 are constituted by 1 inner tube and 1 outer tube coaxially disposed and closely attached thereto, and a wire mesh is provided at the second outer tube section 102 to increase the rigidity at the second outer tube section 102.

As shown in fig. 1, the second outer pipe section 102 is arc-shaped, and the included angle between the axes of the first outer pipe section 101 and the third outer pipe section 103 is not smaller than 90 °.

As shown in fig. 2, the end of the third outer tube section 103 is pre-shaped into a bending section 105, the bending section 105 is a short single bend, the included angle θ1 between the bending section 105 and the axis of the third outer tube section 103 is smaller than 180 °, the bending section 105 bends towards the direction of the first outer tube section 101, so that the included angle between the bending section 105 and the axis of the first outer tube section 101 is smaller than 90 °, by the above arrangement, when the outer tube 100 moves towards the distal end of the inner tube 200 along the inner tube 200, the smoothness of the outer tube 100 during movement can be further enhanced, and at the same time, the inner tube 200 can be prevented from deforming and withdrawing.

The third outer tube section 103 has a length of 10 to 40cm, preferably 10cm, and the second outer tube section 102 has a length of 10 to 20cm, preferably 13cm, and the outer tube 100 has a total length of 80 to 130cm.

The total length of the inner tube 200 is 120-140 cm, including a distal end and a proximal end, the proximal end of the inner tube 200 is connected with a second pushing handle 201, the distal end of the inner tube 200 is subjected to pre-shaping treatment, and fig. 3 is a schematic parameter diagram of each section of the inner tube 200, specifically: the far end of the inner tube 200 is sequentially provided with a first bending section 202, a first straight line section 203, a second bending section 204, a second straight line section 205 and a third bending section 206 which are connected from near to far, wherein the first bending section 202, the first straight line section 203, the second bending section 204, the second straight line section 205 and the third bending section 206 are made of the same materials, the first bending section 202 is in a circular arc shape, the arc length is 3-4 cm, the corresponding central angle theta 2 is 25-30 degrees, the second bending section 204 is in a U shape, the length is 5-8 cm, the third bending section 206 is in a circular arc shape, the arc length is 2-4 cm, and the corresponding central angle theta 3 is 60-90 degrees; the length of the first straight line segment 203 is 4-5 cm, and the length of the second straight line segment 205 is 3-5 cm.

The distal pre-shaped portion of the inner tube 200 may have a higher hardness than the other portions of the inner tube 200 to increase the support of the inner tube 200 in the aortic arch, for example, the distal pre-shaped portion of the inner tube 200 may be formed of a material having a higher hardness than the other portions of the inner tube 200 and may be connected together by heat shrinking or the like.

The guide wire 300 can be a loach guide wire with the diameter of 0.035 inch or smaller and the length of not less than 200cm, the flexible section 301 is arranged at the head end of the guide wire 300, the hardness of the flexible section 301 is lower than that of other parts of the guide wire 300, so as to enhance the vascular positioning capability of the guide wire 300, and the length of the flexible section 301 is 8-12 cm.

In the present utility model, there are various approaches to forming the flexible segment 301 at the distal end of the guide wire 300, including but not limited to:

Mode one: the flexible section 301 and the guide wire body 302 are made of materials with different hardness, wherein the flexible section 301 is made of softer materials, and then the guide wire body 302 and the flexible section 301 are connected together in a welding or hoop mode, as shown in fig. 4;

Mode two: manufacturing a guide wire body 302 and a flexible section 301 by using the same material with lower hardness in an integral molding mode, then coating a hard coating on the surface of the guide wire body 302, and increasing the hardness of the guide wire body 302 by using the cured coating so that the hardness of the flexible section 301 is lower than that of the guide wire body 302; hard coatings with different thicknesses can be respectively coated on the surfaces of the guide wire body 302 and the flexible section 301, and the hardness of the flexible section 301 is lower than that of the guide wire body 302 by utilizing the thickness difference of the coatings.

The hard coat layer may be a conventional metal nitride coat layer (e.g., titanium nitride, niobium nitride, tungsten nitride), a metal carbide coat layer (e.g., titanium carbide, tungsten carbide), a metal oxide coat layer (alumina, zirconia), a metal alloy coat layer (e.g., nickel alloy, chromium alloy), or the like.

The application method of the radial guiding catheter assembly provided by the utility model comprises the following steps: the outer tube 100, the inner tube 200 and the guide wire 300 are coaxially guided into the radial artery, after reaching the aortic arch, the guide wire 300 is retracted, so that the pre-shaped part of the inner tube 200 is restored to the pre-shaped shape in the aortic arch, a stable support is formed at the aortic arch, and a loop super-selected target blood vessel is formed; after the super-selection is successful, the position of the inner tube 200 is kept stable, and the outer tube 100 is pushed along the inner tube 200 until reaching the treatment position; after the outer tube 100 reaches the target site, the guidewire 300 and the inner tube 200 are withdrawn.

In summary, the present utility model improves the super-selective targeting ability of the guide catheter and provides stability by providing the second outer tube segment 102 with greater stiffness between the first outer tube segment 101 and the third outer tube segment 103, and by designing the shape and stiffness of the outer tube 100, the inner tube 200, and the guide wire 300 specifically, and can replace the existing guide catheter to perform the transradial neural interventional treatment.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (11)

1. A transcatheter guide catheter assembly comprising an outer tube, an inner tube, and a guide wire, characterized in that:

The outer tube comprises a first outer tube section, a second outer tube section and a third outer tube section which are sequentially connected, the first outer tube section is connected with a first pushing handle, and the hardness of the first outer tube section and the hardness of the third outer tube section are lower than those of the second outer tube section;

The inner tube includes a distal end, a proximal end, and a second pushing handle, the distal end being pre-shaped.

2. The transcatheter guide catheter assembly of claim 1, wherein the second outer tube section is arcuate, and wherein axes of the first outer tube section and the third outer tube section are non-parallel.

3. The transcatheter guide catheter assembly of claim 1, wherein the third outer tube section has a bend at an end distal from the second outer tube section, the bend and the third outer tube section having axes at an angle of between 90 ° and 180 °.

4. The transcatheter guide catheter assembly of claim 1, wherein the preformed portion of the distal end of the inner tube has a hardness that is higher than the hardness of the proximal end.

5. A transcatheter guide catheter assembly according to claim 1, wherein the head end of the guide wire is provided with a flexible section having a lower durometer than other portions of the guide wire.

6. A radial guide catheter assembly according to claim 1 or 2, wherein the third outer tube section has a length of 10-40 cm.

7. A radial guide catheter assembly according to claim 3, wherein the second outer tube section has a length of 10-20 cm.

8. A transcatheter guide catheter assembly according to claim 5, wherein the flexible section is 8-12 cm in length.

9. The transcatheter guide catheter assembly of claim 5, wherein the guide wire comprises an associated guide wire body, flexible section, each of which is made of a material of different hardness.

10. The transcatheter guide catheter assembly of claim 5, wherein the guide wire comprises an integral guide wire body, a flexible section, a surface of the guide wire body being provided with a hard coating, a surface of the flexible section being free of a hard coating;

Or the surfaces of the guide wire body and the flexible section are provided with hard coatings, and the thickness of the hard coatings on the surfaces of the flexible section is lower than that of the guide wire body.

11. A radial guide catheter assembly according to claim 3 or claim 7, wherein the total length of the outer tube is 80-130 cm.