CN214286269U - Double-cavity micro catheter with developing ring - Google Patents

Abstract

The utility model provides a double-cavity micro catheter with a developing ring, which comprises a developing ring, a first pipe body and a second pipe body, wherein the first pipe body is provided with a proximal section, a transition section and a distal section, and the second pipe body is provided with a connecting section jointed on the periphery of the first pipe body and a tip section which is gradually contracted; the proximal section is provided with a first inner layer forming a first guide wire inner cavity, a spring layer which is wound on the first inner layer in a winding mode and is arranged along the length direction of the first inner layer, a knitting layer which is partially arranged on the outer side of the spring layer, and a first polymer layer which covers the outer side of the knitting layer; the transition section is provided with a first inner layer extending from the proximal section, a spring layer extending from the proximal section and partially covering the outer side of the first inner layer, and a first polymer layer extending from the proximal section and covering the outer side of the woven layer; the distal section has a first inner layer extending from the transition section and a first polymer-like layer extending from the transition section and covering an outer side of the first inner layer, and the developer ring is fixed to an outer periphery of the first inner layer of the distal section.

Description

Double-cavity micro catheter with developing ring

Technical Field

The utility model relates to a two-chamber pipe that declines with development ring.

Background

With the development of social economy, the national life style is deeply changed, particularly, the aging of population and the urbanization progress are accelerated, the prevalence trend of cardiovascular disease risk factors in China is obvious, and the number of people suffering from cardiovascular diseases is continuously increased. At present, 220 tens of thousands of patients suffering from chronic total occlusion of coronary arteries in China are probably present.

Chronic Total Occlusion (CTO) of the coronary artery refers to a lesion in which the coronary artery is 100% occluded and occluded for more than 3 months, requiring a guidewire to be threaded through the CTO lesion. In order to improve the success rate of the guide wire crossing lesion, a double-cavity microcatheter and a guide wire are generally required to be matched for use. After the guidewire reaches the CTO lesion first, the double lumen microcatheter is advanced from the guiding catheter into the coronary artery and along the guidewire, and after reaching the CTO lesion, the guidewire attempts to traverse the CTO lesion. Compared with the traditional coronary intervention method, the distance between the double-cavity micro catheter and the CTO lesion is far smaller than that between the guide catheter and the CTO lesion, so that stronger supporting force can be provided for the guide wire, and the guide wire can pass through the CTO lesion. In addition, due to the small size of the double-cavity micro catheter, the double-cavity micro catheter can alternately advance in the process of opening the CTO lesion, and can improve continuous additional supporting force for a guide wire to pass through the CTO lesion.

However, in the presence of a bifurcation lesion, or a lesion located at a bifurcation in a blood vessel, the guidewire may enter the prosthetic lumen and provide a path into the prosthetic lumen. When a single lumen, dual lumen microcatheter is used, the guidewire is withdrawn from the false lumen or a second guidewire is used directly to retry traversing the lesion into the true lumen, the guidewire will tend to inertially continue into the false lumen along the previously created pathway. And by using the double-cavity micro catheter, one guide wire enters the false cavity, the false cavity passage is closed by the double-cavity micro catheter, and the other guide wire can try to pass through the lesion and enter the true cavity through the inner cavity of the other guide wire of the double-cavity micro catheter. Because the passage of the false cavity is blocked by the double-cavity microcatheter and the first guide wire, the possibility that the second guide wire enters the true cavity is greatly improved.

In the prior art, when the operator pushes in the distal direction, the catheter may be bent halfway. Particularly, the cavity conversion part of the double-cavity micro catheter is the position where stress concentration and bending are most likely to occur. Because the joint portion of the first tube and the second tube of the double-lumen microcatheter has a large difference in flexibility, the bending phenomenon is often likely to occur at a place where the difference in flexibility is large.

SUMMERY OF THE UTILITY MODEL

The utility model discloses in view of above-mentioned prior art's situation and completion, its aim at provides a be convenient for location and propelling movement nature strong, the compliance is strong, tensile ability and anti bending capability are all good two-chamber little pipe with developing ring.

To this end, the present invention provides a double-lumen microcatheter with a developing ring, comprising a developing ring, a first tube body and a second tube body, wherein the first tube body has a proximal end section, a transition section and a distal end section which are connected in sequence, the second tube body has a connecting section which is joined to the outer periphery of the first tube body and a tip section which is connected with the connecting section and is gradually contracted; the first tube body has a first guide wire lumen slidably receiving a guide wire, and in the first tube body, the proximal end section has a first inner layer forming the first guide wire lumen, a spring layer wound in a wound manner around the first inner layer and arranged in a longitudinal direction of the first inner layer, a braid layer partially disposed on an outer side of the spring layer, and a first polymer-like layer covering an outer side of the braid layer; the transition section has a first inner layer extending from the proximal section, a spring layer extending from the proximal section and partially covering an outer side of the first inner layer, and the first polymer-like layer extending from the proximal section and covering an outer side of the spring layer; the distal segment having a first inner layer extending from the transition segment and a first polymer-like layer extending from the transition segment and overlying an outer side of the first inner layer; the second tube has a second guide wire lumen slidably receiving a guide wire, the second tube has a second inner layer forming the second guide wire lumen and a second polymer-like layer overlying an outer side of the second inner layer, the coupling section of the second tube is at least partially coupled to the transition section of the first tube, the visualization ring is secured to an outer periphery of the first inner layer of the distal section, and the first polymer-like layer of the distal section overlies the outer side of the visualization ring.

The utility model relates to an in two-chamber micro catheter with development ring, the seal wire can move through the first seal wire inner chamber of first body, can also move through the second seal wire inner chamber of second body, first body includes the proximal section, changeover portion and distal section, the proximal section has first inlayer, the spring layer, weaving layer and polymer layer, the changeover portion has first inlayer, the part covers spring layer and the polymer layer at first inlayer, the distal section has first inlayer and polymer layer, the second body has hookup section and most advanced section, the periphery at the first inlayer of distal section is fixed to the development ring. Under this condition, the most advanced section of form that contracts gradually can help the propulsion of two-chamber little pipe, the first inlayer of first body, the spring layer, weaving layer and polymer layer from interior to exterior set gradually, thereby improve the propelling movement nature of first body, the development ring of fixing the periphery at first inlayer can be convenient for fix a position and reduce the influence to the compliance of this two-chamber little pipe, the part of first body and second body hookup has better pliability and can form good transition with the near-end section, therefore, can provide one kind and be convenient for fix a position and the propelling movement nature is strong, the compliance is strong, the two-chamber little pipe that has the development ring that tensile strength and bending resistance are all good.

Therefore, the utility model provides a double-cavity micro catheter with a developing ring, which comprises a developing ring, a first tube body and a second tube body, wherein the first tube body is provided with a near-end section, a transition section and a far-end section which are connected in sequence, and the second tube body is provided with a connecting section which is jointed on the periphery of the first tube body and a tip section which is connected with the connecting section and is gradually contracted; the first tube body has a first guide wire lumen slidably receiving a guide wire, and in the first tube body, the proximal end section has a first inner layer forming the first guide wire lumen, a spring layer wound in a wound manner around the first inner layer and arranged in a longitudinal direction of the first inner layer, a braid layer partially disposed on an outer side of the spring layer, and a first polymer-like layer covering an outer side of the braid layer; the transition section has a first inner layer extending from the proximal section, a spring layer extending from the proximal section and partially covering an outer side of the first inner layer, and the first polymer-like layer extending from the proximal section and covering an outer side of the spring layer; the distal segment having a first inner layer extending from the transition segment and a first polymer-like layer extending from the transition segment and overlying an outer side of the first inner layer; the second tube body is provided with a second guide wire inner cavity capable of slidably receiving a guide wire, the second tube body is provided with a second inner layer forming the second guide wire inner cavity and a second polymer layer covering the outer side of the second inner layer, the connecting section of the second tube body is at least partially connected with the transition section of the first tube body, and the developing ring is fixed on the periphery of the double-cavity micro-catheter and is positioned at the distal section. Under this condition, the most advanced section of form that contracts gradually can help the propulsion of two-chamber little pipe, the inlayer of first body, the spring layer, weaving layer and polymer layer from interior to exterior set gradually, thereby improve the pushability of first body, the part of first body and second body hookup has better pliability and can form good transition with the near-end section, the developing ring of fixing in the periphery of two-chamber little pipe can be convenient for fix a position, therefore, can provide one kind be convenient for fix a position and the pushability is strong, the compliance is strong, tensile strength and anti buckling capability are all good two-chamber little pipe with developing ring.

In addition, in the double-lumen microcatheter according to the first or second aspect of the present invention, optionally, the fixing means of the developing ring is one of heat melting, heat molding, heat shrinking, sleeve welding or buckling. The developer ring can thereby be secured to the distal section by one of heat fusing, heat shrinking, shrink fitting, or snapping.

In addition, in the double-lumen microcatheter of the first or second aspect of the present invention, optionally, the transition section has a spring layer ending at a starting position of a junction of the first tube and the second tube. Therefore, the junction of the first pipe body and the second pipe body can be well transited to the transition section with the spring layer.

In addition, in the double-lumen microcatheter according to the first or second aspect of the present invention, optionally, the developing ring is composed of a resin and a developing material, the developing material is one of gold, platinum, iridium, platinum-iridium alloy, barium sulfate, bismuth oxide, bismuth trioxide, bismuth oxycarbonate, bismuth subcarbonate, bismuth tungstate, zirconium oxide, tantalum, cobalt-chromium alloy, tungsten oxide, tungsten dioxide, tungsten trioxide, stainless steel, and titanium, and the content of the developing material is 30% to 90%. Therefore, the influence of the developing ring on the flexibility of the double-cavity micro-catheter can be further reduced.

Further, in the double-lumen microcatheter of the first or second aspect of the present invention, optionally, the second type polymer layer of the tip section is composed of a resin and the visualization material. From this, can be convenient for fix a position the second body.

In addition, in the double-lumen microcatheter according to the first or second aspect of the present invention, optionally, in the first tube, the flexibility of the proximal section, the flexibility of the transition section, and the flexibility of the distal section are gradually reduced, in the second tube, the flexibility of the coupling section and the flexibility of the tip section are gradually reduced, an outer diameter of the transition section is gradually reduced from the proximal section side toward the distal section side, and the flexibility of the transition section is gradually reduced, in a coupling portion of the first tube and the coupling section, the first-type polymer layer further coats the coupling section so that the first-type polymer layer covers the second-type polymer layer, and the first tube and the tip section of the second tube are not in contact. From this, can change the compliance of the little pipe of two-chamber gradually and reduce cracked risk, thereby improve the holistic compliance of the little pipe of two-chamber, can be convenient for the little pipe of two-chamber to pass in the blood vessel, improve the hookup nature of first body and second body, thereby improve the holistic stability of the little pipe of two-chamber, in addition, the distal end section of first body can be linked together and not contact with the tip section with the hookup section of second body, from this, the tip section can further extend along the direction that is on a parallel with the distal end section.

In addition, in the double lumen microcatheter of the first aspect of the present invention, optionally, the first polymer layer comprises a first polymer layer having a first hardness disposed at the proximal segment, a second polymer layer having a second hardness disposed at the transition segment, a third polymer layer having a third hardness disposed at the distal segment, and a fourth polymer layer having a fourth hardness connected to the third polymer layer, the fourth polymer layer covering the outside of the visualization ring; the polymer layers of the second type include a fifth polymer layer having a fifth hardness, a sixth polymer layer connected to the fifth polymer layer and having a sixth hardness, a seventh polymer layer connected to the sixth polymer layer and having a seventh hardness, an eighth polymer layer connected to the seventh polymer layer and having an eighth hardness, and a ninth polymer layer having a ninth hardness. In this case, the first polymer layer and the second polymer layer may be combined by a plurality of polymer layers, and different polymer layers may have different hardnesses, whereby an appropriate hardness can be selected depending on the positions where the different polymer layers are located, the bending resistance of the double-lumen microcatheter is further improved while ensuring the flexibility and the positioning is facilitated.

Further, in the double lumen microcatheter according to the first aspect of the present invention, optionally, the third hardness is equal to the sixth hardness, the fourth hardness is equal to the seventh hardness, and the first hardness, the second hardness, the fifth hardness, the third hardness, the fourth hardness, the eighth hardness, and the ninth hardness are gradually decreased. Thereby, the difference in flexibility between the polymer layers can be reduced, thereby improving the bending resistance.

Further, in the double lumen microcatheter according to the first aspect of the present invention, optionally, the first hardness, the second hardness, the fifth hardness, the third hardness, the fourth hardness, the sixth hardness, the seventh hardness, the eighth hardness, and the ninth hardness are gradually decreased. Therefore, the hardness of the double-cavity micro catheter can be gradually changed by arranging the gradual reduction of the hardness, and the double-cavity micro catheter has good flexibility.

In addition, in the double-lumen microcatheter according to the first or second aspect of the present invention, optionally, the spring layer is made by spirally winding a wire material around the first inner layer in a winding manner, and the braid layer is made by weaving a wire material around the outer side of the spring layer. Therefore, the reliability of the double-cavity micro-catheter can be improved.

In addition, in the double-lumen microcatheter according to the first aspect of the present invention, optionally, the first polymer layer includes a first polymer layer having a first elastic modulus disposed at the proximal section, a second polymer layer having a second elastic modulus disposed at the transition section, a third polymer layer having a third elastic modulus disposed at the distal section, and a fourth polymer layer having a fourth elastic modulus and connected to the third polymer layer, the fourth polymer layer covering an outer side of the developing ring; the polymer layers of the second class include a fifth polymer layer having a fifth modulus of elasticity, a sixth polymer layer connected to the fifth polymer layer and having a sixth modulus of elasticity, a seventh polymer layer connected to the sixth polymer layer and having a seventh modulus of elasticity, an eighth polymer layer connected to the seventh polymer layer and having an eighth modulus of elasticity, and a ninth polymer layer having a ninth modulus of elasticity. In this case, the first polymer layer and the second polymer layer may be composed of a plurality of polymer layers having different elastic moduli, whereby an appropriate elastic modulus can be selected depending on the positions where the different polymer layers are located, and the bending resistance of the double-lumen microcatheter is further improved while ensuring flexibility and the positioning is facilitated.

In addition, in the double-lumen microcatheter according to the first aspect of the present invention, optionally, the third elastic modulus is equal to the sixth elastic modulus, the fourth elastic modulus is equal to the seventh elastic modulus, and the first elastic modulus, the second elastic modulus, the fifth elastic modulus, the third elastic modulus, the fourth elastic modulus, the eighth elastic modulus, and the ninth elastic modulus are gradually decreased. Therefore, the double-cavity micro catheter has good flexibility, and bending resistance and tensile resistance are improved.

In addition, in the double-lumen microcatheter according to the first aspect of the present invention, optionally, the first elastic modulus, the second elastic modulus, the fifth elastic modulus, the third elastic modulus, the fourth elastic modulus, the sixth elastic modulus, the seventh elastic modulus, the eighth elastic modulus and the ninth elastic modulus are gradually decreased. Therefore, the double-cavity micro catheter can gradually change the elastic modulus by arranging the gradual reduction of the elastic modulus, and has good flexibility.

According to the utility model discloses, can provide one kind and be convenient for location and propelling movement nature strong, the compliance is strong, tensile ability and anti bending capability are all good two-chamber little pipe with developing ring.

Drawings

Embodiments of the invention will now be explained in further detail by way of example only with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram showing the overall structure of a double lumen microcatheter with a visualization ring according to an example of the present invention.

Fig. 2 is a partially enlarged schematic view illustrating a double lumen microcatheter with a visualization ring according to an example of the present invention.

Fig. 3 is a schematic diagram illustrating a proximal segment catheter hierarchy of a dual lumen microcatheter with a visualization ring according to an example of the present invention.

Fig. 4 is a schematic view showing a cross-sectional structure of the pipe body along the AA' direction in fig. 2 according to an example of the present invention.

Fig. 5 is a schematic structural section view in the BB' direction in fig. 2 showing an example of the present invention.

Fig. 6 is a schematic structural section view along the CC' direction in fig. 2, showing an example of the present invention.

Fig. 7 is a schematic structural cross-sectional view showing modification 1 in the CC' direction in fig. 2 according to an example of the present invention.

Fig. 8 is a schematic cross-sectional view showing a pipe body according to modification 2 of fig. 2 along the AA' direction according to an example of the present invention.

Fig. 9 is a schematic structural cross-sectional view showing modification 2 in the CC' direction in fig. 2 according to an example of the present invention.

The reference numbers illustrate:

1 … dual lumen microcatheter, 10 … first tube, S1 … proximal segment, S2 … transition segment, S3 … distal segment, 11 … first inner layer, 12 … spring layer, 13 … braid layer, 14 … first polymer layer, 30 … developer ring, a … first polymer layer, b … second polymer layer, c … third polymer layer, d … fourth polymer layer, 20 … second tube, K1 … coupling segment, K2 … tip segment, 21 … second inner layer, 22 … second polymer layer, e … fifth polymer layer, f … sixth polymer layer, g … seventh polymer layer, h … eighth polymer layer, i … ninth polymer layer, 23 … third polymer layer, 2 … seat.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments. In the drawings, the same components or components having the same functions are denoted by the same reference numerals, and redundant description thereof will be omitted.

Fig. 1 is a schematic view showing the overall structure of a double-lumen microcatheter 1 with a visualization ring according to an example of the present invention. As shown in fig. 1, the present invention relates to a double-lumen microcatheter 1 with a visualization ring. The utility model relates to a two-chamber pipe 1 a little with developing ring is convenient for fix a position and propelling movement nature is strong, the compliance is strong, tensile strength and anti ability of buckling are all good. The utility model relates to a little pipe 1 of two-chamber with develop ring can be referred to as little pipe 1 of two-chamber for short. In some examples, a double lumen microcatheter 1 may have a catheter hub 2 attached to one end (see fig. 1). In some examples, catheter hub 2 may be passed over a guidewire.

In some examples, the double lumen micro-catheter 1 of the present invention may be used for interventional treatment of Chronic Total Occlusion (CTO) of coronary arteries. Specifically, interventional therapy of CTO includes: firstly, a guide wire is pushed to a coronary artery and reaches a position of chronic complete occlusion of the coronary artery, then the double-cavity micro catheter 1 enters the position of chronic complete occlusion of the coronary artery along the guide wire, then the guide wire enters a lesion area by utilizing the supporting force of the double-cavity micro catheter 1, then the double-cavity micro catheter 1 advances along the guide wire and enters the lesion area, and finally the guide wire passes through the region of chronic complete occlusion of the coronary artery by utilizing the supporting force provided by the double-cavity micro catheter 1 for the guide wire. When a bifurcation lesion is present, or the lesion is located at a bifurcation of a blood vessel, the guidewire may enter the prosthetic lumen and create a path into the prosthetic lumen. When the guide wire enters the false cavity through the first guide wire inner cavity, the false cavity passage is closed through the double-cavity micro catheter 1, and the other guide wire tries to pass through the lesion through the second guide wire inner cavity of the double-cavity micro catheter 1 and enters the true cavity. In this case, since the passage of the false lumen has been blocked by the double lumen microcatheter 1, the possibility of the second lumen entering the true lumen is greatly increased.

In some examples, the double lumen microcatheter 1 may be advanced with the guidewire during crossing of the diseased region. Thereby, the supporting force can be continuously provided to the guide wire.

In other examples, the double lumen microcatheter 1 may be advanced alternately with a guidewire. Specifically, the double-lumen microcatheter 1 can perform crossing of a lesion region in turn with the guide wire, thereby improving the reliability of the crossing and providing a continuous supporting force to the guide wire.

Fig. 2 is a partially enlarged schematic view showing a double-lumen microcatheter 1 with a visualization ring according to an example of the present invention. Fig. 3 is a schematic view showing the proximal end segment S1 catheter hierarchy of the double lumen microcatheter 1 with visualization ring according to an example of the present invention. Fig. 4 is a schematic view showing a cross-sectional structure of the pipe body along the AA' direction in fig. 2 according to an example of the present invention.

In the present embodiment, the double-lumen microcatheter 1 with the visualization ring may include a first tube 10, a second tube 20, and a visualization ring 30 (see fig. 2, 3, and 4). The second tube 20 may be coupled to the first tube 10. The first pipe body 10 may include a first inner layer 11, a spring layer 12, a mesh 13, and a polymer layer, and the second pipe body 20 may include a second inner layer 21 and a polymer layer (see fig. 3 and 4). The developer ring 30 is located at the distal end of the first tube 10. First inlayer 11 of first body 10, spring layer 12, mesh grid 13 and polymer layer from interior to exterior set gradually, thereby improve the propelling movement nature of first body 10, development ring 30 can be convenient for fix a position the position of two-chamber little pipe 1 in the blood vessel, first body 10 has better pliability with the junction of second body 20, from this, can provide one kind and be convenient for fix a position and propelling movement nature is strong, the compliance is strong, tensile strength and anti buckling capacity are good have the two-chamber little pipe 1 of development ring.

In some examples, as described above, the double lumen microcatheter 1 with a visualization ring may include a first tube 10 (see fig. 2).

In some examples, as shown in fig. 4, the first tube 10 may have a proximal section S1, a transition section S2, and a distal section S3 connected in series. In some examples, the distal segment S3 may have a beveled cut. The oblique cut of the distal segment S3 may be the exit of a first guidewire lumen (described in detail later). Specifically, the end of the distal segment S3 (i.e., the end of the distal segment S3 distal to the proximal segment S1) has a chamfered cut. The chamfer of the chamfer is a curved surface. In some examples, the chamfered surface of the chamfered cut of the distal section S3 interfaces with the second tube 20 (described in detail below). Specifically, the chamfered surface of the chamfered cut of the distal section S3 may be contiguous with the second polymer-like layer 22 (described in detail later) of the second tube 20. Referring to fig. 4, the chamfered surface of the chamfered cut of the distal section S3 forms an acute angle θ with the second body 20. In this case, the first tube 10 can be gradually reduced, thereby gradually improving the flexibility of the double-lumen microcatheter 1 as a whole.

In some examples, from the proximal segment S1 side toward the distal segment S3 side, the outer diameter of the transition segment S2 may gradually decrease and the flexibility of the transition segment S2 gradually decreases. Thereby, the double-lumen micro-catheter 1 can be conveniently passed through the blood vessel.

In some examples, as described above, the first pipe body 10 may include the first inner layer 11 (see fig. 3 and 4). The first inner layer 11 may form a first guidewire lumen. That is, the first tube 10 may have a first guidewire lumen that slidably receives a guidewire. The first guidewire lumen extends from the proximal segment S1 to the incision at the distal segment S3.

In some examples, in the first tubular body 10, the proximal section S1 may have a first inner layer 11, a spring layer 12, a braid 13, and a first polymer-like layer 14 (see fig. 3 and 4).

Fig. 5 is a schematic structural section view in the BB' direction in fig. 2 showing an example of the present invention. In some examples, the first inner layer 11, the spring layer 12, the braid 13 and the first polymer-like layer 14 may be disposed in a close fitting manner (see fig. 5), whereby the fastening and reliability of the double lumen microcatheter 1 can be improved.

In some examples, as described above, the first inner layer 11 may form a first guidewire lumen. In the first tube 10, the proximal section S1 may have a first inner layer 11 (see fig. 4) forming a first guidewire lumen.

In some examples, the first inner layer 11 may be made of one of Polytetrafluoroethylene (PTFE), Fluorinated Ethylene Propylene (FEP), perfluoroalkoxy alkane (PFA), polyethylene terephthalate (PET), or polyether ether ketone (PEEK).

In some examples, the spring layer 12 may be wound around the first inner layer 11 in a wound manner and aligned along a length direction of the first inner layer 11 (see fig. 3).

In some examples, the spring layer 12 may be made of metal, and in particular, the spring layer 12 may be made of 304 stainless steel wire.

In some examples, the braid 13 may be disposed outside the spring layer 12 (see fig. 3 and 4). In some examples, the braid 13 of the proximal segment S1 may be partially disposed outside of the spring layer 12 (see fig. 4).

In some examples, braid 13 may be made of metal or fiber. Specifically, the braid 13 may be made of 304 stainless steel material.

In some examples, the spring layer 12 may be made by spirally winding wire material around the first inner layer 11 in a winding manner. The braid 13 may be made by braiding a braided wire material on the outer side of the spring layer 12. In this case, even if the torque is continuously input from the outside, the portion of the spring layer 12 wrapped with the braid 13 is protected by the braid 13 on the outside so as not to be scattered, and thus, the reliability of the double lumen microcatheter 1 can be improved.

In some examples, the wire used for the spring layer 12 may be a flat wire. In some examples, the braided wire used for braid 13 may be a flat wire. In some examples, a flat wire may refer to a wire that is rectangular in cross-section. Specifically, the spring layer 12 and the braid layer 13 may be wound around the first inner layer 11 with the wide surface of the flat wire material facing the first inner layer 11, thereby reducing the thickness of the spring layer 12 and the braid layer 13. Additionally, in some examples, the spring layer 12 may also use round wires.

In other examples, the thickness of the flat wire used for the spring layer 12 may be the same as the thickness of the flat wire used for the braid layer 13. Additionally, in some examples, the wire thickness of the spring layer 12 may be greater than the wire thickness of the braid layer 13. Therefore, the double-lumen micro-catheter 1 can obtain sufficient supporting force through the spring layer 12, and the pushing performance of the double-lumen micro-catheter 1 can be improved.

In other examples, the thickness of the flat wire used for the spring layer 12 and the braid layer 13 may be uniform. In other examples, the thickness of the flat wire used for the spring layer 12 and the braid layer 13 may be non-uniform.

In some examples, the spring layer 12 may be arranged along the circumferential direction of the first inner layer 11 and closely adjacent to the first inner layer 11. For example, the spring layer 12 may be formed by winding a wire in a clockwise direction. In addition, the spring layer 12 may be formed by winding a wire in a counterclockwise direction.

In some examples, braid layer 13 may be disposed along a circumferential direction of first inner layer 11 and closely adjacent to spring layer 12. For example, the braid 13 may be formed by winding a braid wire in a clockwise direction. In addition, the braid 13 may be formed by winding the braid wire in a counterclockwise direction. In other examples, the braided layer 13 may be interlaced in a mesh shape by braiding wires.

In some examples, the spring layer 12 is made by spirally winding a wire material on the first inner layer in a winding manner, and the braid layer 13 is made by braiding a braided wire material on the outer side of the spring layer 12. In this case, even if the torque is continuously input from the outside, the portion of the spring layer 12 wrapped with the braid 13 is protected by the braid 13 on the outside so as not to be scattered, and thus, the reliability of the double lumen microcatheter 1 can be improved.

In some examples, as described above, the proximal segment S1 may have the first-type polymer layer 14 (see fig. 3 and 4) in the first tube 10. The first type of polymer layer 14 may be coated on the outside of the woven layer 13 (see fig. 3 and 4).

In some examples, the first polymer layer 14 may be made of one of a polyamide material (PA), a polyether block Polyamide (PEBAX), a polyurethane material (TPU), an elastomer, or a synthetic rubber (TPE).

In some examples, the first inner layer 11 and the first polymer-like layer 14 may not have a definite boundary. For example, the first inner layer 11 and the first polymer layer 14 may be fused, flow-over, thermoplastic, etc. In other examples, the first inner layer 11 and the first polymer layer 14 may be made of the same material.

In some examples, the thickness of the first inner layer 11 may be less than the thickness of the first polymer-like layer 14.

In some examples, the sum of the thickness of the spring layer 12 and the thickness of the braid layer 13 is less than the first polymer-like layer 14. Therefore, the pushing performance of the double-cavity micro catheter can be improved.

In the present embodiment, in the first pipe body 10, the transition section S2 may have the first inner layer 11, the spring layer 12, and the first polymer-like layer 14 (see fig. 4).

In some examples, the first inner layer 11 of the transition segment S2 may be the extension of the first inner layer 11 of the proximal segment S1 to the transition segment S2. That is, the transition section S2 may have a first inner layer 11 extending from the proximal section S1.

In some examples, the spring layer 12 of the transition section S2 may extend from the proximal section S1 and be disposed outside of the first inner layer 11.

In other examples, the spring layer 12 of the transition section S2 may partially cover the outside of the first inner layer 11.

In other examples, the transition segment S2 may have the spring layer 12 terminating at a starting position at the junction of the first tube 10 and the second tube 20 (see fig. 4). That is, the spring layer 12 may stop winding and extending at the beginning of the junction of the transition section S2 and the second tube 20.

In some examples, the first polymer-like layer 14 of the transition section S2 may extend from the proximal section S1 and cover the outside of the spring layer 12.

In some examples, braid 13 does not extend to transition section S2 and distal section S3. The spring layer 12 does not extend to the distal segment S3 (see fig. 4).

In the present embodiment, in the first pipe body 10, the distal end section S3 may have the first inner layer 11 and the first type polymer layer 14 (see fig. 4).

In some examples, the first inner layer 11 of the distal segment S3 may be the result of the first inner layer 11 of the transition segment S2 extending to the distal segment S3. That is, the distal segment S3 may have a first inner layer 11 extending from the transition segment S2.

In some examples, the flexibility of the proximal segment S1, the flexibility of the transition segment S2, and the flexibility of the distal segment S3 may gradually decrease in the first tube 10. This can gradually improve the flexibility of the first pipe 10.

In some examples, the first-type polymer layers 14 may include a first polymer layer a having a first durometer disposed at the proximal segment S1, a second polymer layer b having a second durometer disposed at the transition segment S2, a third polymer layer c having a third durometer disposed at the distal segment S3, and a fourth polymer layer d having a fourth durometer connected to the third polymer layer c (see fig. 4). In this case, the first polymer layer 14 may be composed of a plurality of polymer layers, and different polymer layers may have different hardnesses, whereby the suitable hardness can be selected according to the different positions where the different polymer layers are located, further improving the bending resistance of the double-lumen microcatheter 1 while ensuring flexibility. Specifically, after the polymer layers with different hardness are sleeved on the periphery of the first pipe 10 by means of splicing, the polymer layers are fixed on the periphery of the first pipe 10 by means of hot melting, thermal molding or thermal shrinkage.

In some examples, the first hardness may range from 60-90 HB. The second hardness may range from 50 to 80 HB. The fifth hardness may range from 45 HB to 80 HB. The third hardness may range from 40 to 75 HB. The fourth hardness may range from 35 to 70 HB. The eighth hardness may range from 30 to 65 HB. The ninth hardness may range from 30 to 60 HB. Wherein HB represents the brinell hardness number.

In some examples, the plurality of polymer layers of the first type of polymer layer 14 may have different elastic moduli. Specifically, the first polymer layer a disposed at the proximal segment S1 may have a first modulus of elasticity. The second polymer layer b disposed at the transition section S2 may have a second modulus of elasticity. The third polymer layer c disposed at the distal segment S3 may have a third modulus of elasticity. The fourth polymer layer d connected to the third polymer layer c may have a fourth elastic modulus. In this case, the first-type polymer layer 14 may be combined by a plurality of polymer layers having different elastic moduli. Therefore, the proper elastic modulus can be selected according to different positions of different polymer layers, and the bending resistance of the double-cavity micro-catheter 1 is further improved under the condition of ensuring the flexibility. Specifically, after the polymer layers with different elastic moduli are sleeved on the periphery of the first pipe 10 by splicing, the polymer layers are fixed on the periphery of the first pipe 10 by hot melting, thermal molding, thermal shrinkage or other methods.

In some examples, as described above, the double lumen microcatheter 1 with a visualization ring may include a second tube 20 (see fig. 2). The second tube 20 may be coupled to the outer circumference of the first tube 10 (see fig. 4). In other words, the second tube 20 may be partially in contact with the first tube 10.

In some examples, the second tube 20 may have a coupling segment K1 (see fig. 4). The coupling section K1 may be coupled to the outer circumference of the first pipe body 10. For example, the coupling section K1 of the second pipe body 20 may be in contact with the first pipe body 10.

In some examples, the second tube 20 may have a tip section K2 (see fig. 4). The tip section K2 meets the coupling section K1 and is tapered.

In some examples, the first tube 10 is not in contact with the tip section K2 of the second tube 20. In this case, the distal section S3 of the first tube 10 can be coupled with the coupling section K1 of the second tube 20 without contacting the tip section K2. Thereby, the tip section K2 can extend further in a direction parallel to the distal section S3.

In some examples, the coupling section K1 of the second tube 20 is at least partially coupled with the transition section S2 of the first tube 10. In particular, the projection of the coupling section K1 in the radial direction at least partially coincides with the projection of the transition section S2 in the radial direction.

In some examples, the coupling section K1 and the tip section K2 may be joined by means of a chamfer.

In some examples, the outer diameter of coupling segment K1 may gradually decrease in a direction approaching the tip of tip segment K2, and the outer diameter of the engaging portion of tip segment K2 and coupling segment K1 remains unchanged. Specifically, the outer diameter of the engaging portion of the tip section K2 and the coupling section K1 coincides with the outer diameter of the coupling section K1 at a position near the engaging portion. Thereby, the flexibility of the coupling section K1 can be gradually changed, and the bending resistance and the tensile resistance can be improved. The joint portion of the tip section K2 and the coupling section K1 may refer to the joint of the coupling section K1 and the tip section K2 and a portion near the joint.

In some examples, the manner in which the outer diameter of coupling section K1 gradually decreases in a direction approaching the tip of tip section K2 may be a uniform reduction. In other examples, the manner in which the outer diameter of the coupling segment K1 gradually decreases in a direction approaching the tip of the tip segment K2 may be such that the position closer to the tip of the tip segment K2 is more reduced in magnitude. In addition, in some examples, the manner in which the outer diameter of the coupling segment K1 is gradually reduced in a direction approaching the tip of the tip segment K2 may be that the position closer to the tip of the tip segment K2 is reduced by a smaller magnitude. In other examples, the outer diameter of the coupling section K1 may be gradually reduced in a stepwise manner in a manner of gradually reducing in a direction approaching the tip of the tip section K2. In this case, the manner of reduction may be selected as desired, whereby different flexibility can be obtained depending on the manner in which the link section K1 is reduced.

In some examples, tip segment K2 may be tapered from the engagement portion. Specifically, the outer diameter of tip segment K2 may gradually decrease in outer diameter in a direction away from the joint portion.

In some examples, the link section K1 may have an angled cut. The oblique cut of the link section K1 may be the entrance to a second guidewire lumen (described in detail later). Specifically, the end of the coupling section K1 (i.e., the end of the coupling section K1 remote from the tip section K2) has a chamfered cut. The chamfer of the chamfer is a curved surface. In some examples, the chamfered surface of the chamfered cut of the coupling section K1 meets the first pipe body 10. Specifically, the chamfered surface of the chamfered cut of the coupling section K1 may be in contact with the first polymer layer 14 of the first pipe body 10. Referring to fig. 4, the chamfered surface of the chamfered cut of the coupling section K1 forms an acute angle with the first pipe body 10

In this case, it is possible to gradually increase the second pipe 20, thereby reducing the difference in flexibility by the second pipe 20 as a whole.

In some examples, the chamfered surface of the chamfered cut of the coupling section K1 may meet the first polymer layer 14 of the first pipe 10 at a position where the spring layer 12 of the transition section S2 stops.

In the present embodiment, the second pipe body 20 may have a second inner layer 21 (see fig. 4). The second inner layer 21 may form a second guidewire lumen. That is, the second tube 20 may have a second guidewire lumen that slidably receives a guidewire. The second guidewire lumen extends from the link segment K1 to the tip segment K2.

In some examples, the second inner layer 21 may be made of one of Polytetrafluoroethylene (PTFE), Fluorinated Ethylene Propylene (FEP), perfluoroalkoxy alkane (PFA), polyethylene terephthalate (PET), or Polyetheretherketone (PEEK).

In some examples, the second tube 20 can have a second type of polymer layer 22 (see fig. 4). The second type of polymer layer 22 may cover the outside of the second inner layer 21.

In some examples, the thickness of the second inner layer 21 may be less than the thickness of the second type polymer layer 22.

In some examples, the second type of polymer layer 22 may be made of one of a polyamide material, a polyether block polyamide, a polyurethane material, an elastomer, or a synthetic rubber.

In some examples, in the second pipe body 20, the coupling segment K1 may have a second inner layer 21 and a second type polymer layer 22 (see fig. 4).

In some examples, in the second tube 20, the tip section K2 may have a second inner layer 21 and a second type polymer layer 22 (see fig. 4).

In some examples, the second type polymer layer 22 of the tip section K2 may be composed of a resin and a developing material (described in detail later). For example, the material of the second type polymer layer 22 of the tip section K2 may be a combination of resin and tungsten powder. Thereby, development of the second tube 20 is facilitated. In other words, the location of the second tube 20 in the blood vessel is facilitated.

In some examples, as described above, the second inner layer 21 may form a second guidewire lumen. The inner diameter of the second guidewire lumen of tip segment K2 may be tapered in a uniform manner. Thereby, a greater supporting force can be provided to the guide wire. In other examples, the inner diameter of the second guidewire lumen may be reduced in a manner that reduces by a greater amount closer to the tip.

Additionally, in some examples, the inner diameter of the second guidewire lumen may be reduced in a manner that reduces by a lesser amount closer to the tip. In other examples, the inner diameter of the second guidewire lumen may be reduced in a stepwise manner. In this case, the way of narrowing can be selected as desired, whereby different properties can be obtained depending on the way of narrowing the guidewire lumen.

In some examples, the flexibility of the coupling section K1 and the flexibility of the tip section K2 may gradually decrease in the second tube 20. Therefore, the flexibility of the double-lumen microcatheter 1 can be gradually changed to reduce the risk of breakage, thereby improving the flexibility of the whole double-lumen microcatheter 1.

In some examples, the second type polymer layer 22 may include a fifth polymer layer e having a fifth hardness, a sixth polymer layer f connected with the fifth polymer layer e and having a sixth hardness, a seventh polymer layer g connected with the sixth polymer layer f and having a seventh hardness, an eighth polymer layer h connected with the seventh polymer layer g and having an eighth hardness, and a ninth polymer layer i having a ninth hardness. In this case, the second type polymer layer 22 may be combined from a plurality of polymer layers and form a fit with the first type polymer layer 14 at the joint, whereby the compliance of the double lumen microcatheter 1 can be adjusted by adjusting the combination of the first type polymer layer 14 and the second type polymer layer 22. Specifically, the polymer layers with different hardness can be sleeved on the periphery of the second pipe body 20 in a splicing manner and then fixed on the periphery of the second pipe body 20 in a hot melting, thermoplastic or thermal shrinkage manner.

In some examples, multiple polymer layers of the second type of polymer layer 22 may have different elastic moduli. Specifically, the fifth polymer layer e may have a fifth elastic modulus. The sixth polymer layer f connected to the fifth polymer layer e may have a sixth elastic modulus. The seventh polymer layer g connected to the sixth polymer layer f may have a seventh elastic modulus. The eighth polymer layer h connected to the seventh polymer layer g may have an eighth elastic modulus. The ninth polymer layer i may have a ninth elastic modulus. In this case, the second type polymer layer 22 may be combined from a plurality of polymer layers and form a fit with the first type polymer layer 14 at the joint, whereby the compliance of the double lumen microcatheter 1 can be adjusted by adjusting the combination of the first type polymer layer 14 and the second type polymer layer 22. Specifically, the polymer layers with different elastic moduli may be sleeved on the periphery of the second pipe body 20 in a splicing manner, and then fixed on the periphery of the second pipe body 20 in a hot melting, thermoplastic or thermal shrinkage manner.

In some examples, the first hardness may be greater than the fourth hardness, the third hardness may be equal to the sixth hardness, the fourth hardness may be equal to the seventh hardness, and the fifth hardness may be greater than the ninth hardness. Therefore, the double-cavity micro catheter 1 has good flexibility, and bending resistance and tensile resistance are improved.

In some examples, the first hardness, the second hardness, the fifth hardness, the third hardness, the fourth hardness, the sixth hardness, the seventh hardness, the eighth hardness, and the ninth hardness may gradually decrease. Therefore, the double-cavity micro-catheter 1 can gradually change the hardness by arranging the gradual reduction of the hardness, and has good flexibility.

In other examples, the first hardness, the second hardness, the fifth hardness, the third hardness, the fourth hardness, the eighth hardness, and the ninth hardness may be gradually decreased in the order described. In this case, the first pipe 10 and the second pipe 20 may have portions of polymer layers having the same hardness, and thus, a difference in flexibility between the polymer layers can be reduced, thereby improving bending resistance.

Further, specifically, the first hardness is greater than the second hardness, the second hardness is greater than the fifth hardness, the fifth hardness is greater than the third hardness, the third hardness is equal to the sixth hardness and greater than the fourth hardness, the fourth hardness is equal to the seventh hardness and greater than the eighth hardness, and the eighth hardness is greater than the ninth hardness.

In some examples, the modulus of elasticity of the double lumen microcatheter 1 as a whole is gradually reduced from the proximal section S1 to the tip section K2. This can improve the flexibility of the double-lumen microcatheter 1 as a whole.

In some examples, the first elastic modulus may be greater than the fourth elastic modulus, the third elastic modulus may be equal to the sixth elastic modulus, the fourth elastic modulus may be equal to the seventh elastic modulus, and the fifth elastic modulus may be greater than the ninth elastic modulus. Therefore, the double-cavity micro catheter 1 has good flexibility, and bending resistance and tensile resistance are improved.

In some examples, the first, second, fifth, third, fourth, sixth, seventh, eighth, and ninth elastic moduli may be gradually decreased. Therefore, the double-cavity micro-catheter 1 can gradually change the elastic modulus by arranging the gradual reduction of the elastic modulus, and has good flexibility.

In some examples, the first elastic modulus, the second elastic modulus, the fifth elastic modulus, the third elastic modulus, the fourth elastic modulus, the eighth elastic modulus, and the ninth elastic modulus may be gradually decreased in the order. In this case, the first pipe 10 and the second pipe 20 may have portions of polymer layers having the same modulus of elasticity, and thus, it is possible to reduce a difference in flexibility between the polymer layers, thereby improving bending resistance.

Further, specifically, the first elastic modulus is greater than the second elastic modulus, the second elastic modulus is greater than the fifth elastic modulus, the fifth elastic modulus is greater than the third elastic modulus, the third elastic modulus is equal to the sixth elastic modulus and greater than the fourth elastic modulus, the fourth elastic modulus is equal to the seventh elastic modulus and greater than the eighth elastic modulus, and the eighth elastic modulus is greater than the ninth elastic modulus. Thus, the modulus of elasticity of the double lumen microcatheter 1 as a whole is gradually reduced from the proximal segment S1 to the junction segment K1.

Here, further description is made in conjunction with fig. 4:

in some examples, proximal section S1 has less braid 13 at transition section S2 than at transition section S2, whereby the flexibility of transition section S2 is greater than the flexibility of proximal section S1, and then the flexibility of transition section S2 is further gradually increased by reducing the thickness of second polymer layer b of transition section S2 to a predetermined thickness.

In some examples, the fifth polymer layer e of the linking section K1 is linked to the second polymer layer b of the transition section S2, which increases the thickness of the double lumen microcatheter 1 as a whole, resulting in reduced flexibility, thus making the fifth polymer layer e have a fifth hardness less than the second hardness of the second polymer layer b, thereby counteracting some of the effect on flexibility due to the second tube 20.

In addition, the spring layer 12 may stop winding and extending at the starting position of the joint of the fifth polymer layer e and the second polymer layer b, so as to further counteract a part of the influence of the flexibility of the second tube 20.

In some examples, the sixth polymer layer f of the coupling segment K1 has a sixth durometer that is the same as the third polymer layer c of the distal segment S3, and the sixth polymer layer f is in the same position as the third polymer layer c, i.e., a projection in the radial direction completely coincides. Thus, the flexibility of the sixth polymer layer f and the third polymer layer c is stable, and good stability can be maintained even if the use distance is extended.

In some examples, the seventh polymer layer g of the coupling segment K1 has a seventh durometer that is the same as the fourth polymer layer d of the distal segment S3, and the seventh durometer is less than the sixth durometer, i.e., the fourth durometer is less than the third durometer. Therefore, the flexibility change trend is consistent, and the overall stability of the double-cavity micro-catheter 1 is improved.

In some examples, the eighth polymer layer h of the coupling segment K1 has an eighth durometer that is less than the seventh durometer of the seventh polymer layer g, and the eighth polymer layer h corresponds to the exit of the first tube 10 (i.e., the exit of the first guidewire lumen). This can gradually increase the flexibility of the double-lumen microcatheter 1 as a whole. Furthermore, the ninth hardness of the ninth polymer layer i of the tip section K2 is smaller than the eighth hardness of the eighth polymer layer h. Therefore, the eighth polymer layer h can be used as a transition for connecting the connecting section K1 with the tip section K2, so that the flexibility difference is reduced, and the bending resistance of the double-cavity micro-catheter 1 is further improved.

In some examples, the polymer layers of different hardnesses may be made of different materials. In other examples, polymer layers of the same durometer may be made of the same material. However, the present embodiment is not limited thereto, and polymer layers of the same hardness may be made of different materials.

In some examples, the dual lumen microcatheter 1 may include a visualization ring 30, as described above. The developer ring 30 may be located at the distal section S3 of the first tube 10. Thereby, the positioning of the first tube 10 in the blood vessel can be facilitated.

In some examples, as shown in fig. 4 or 6, developer ring 30 may be secured to the outer periphery of first inner layer 11 of distal segment S3. Wherein, the fixing mode can be one of hot melting, thermoplastic, thermal shrinkage, sleeve welding or buckling. Thus, developer ring 30 can be secured to distal segment S3 by one of heat staking, heat shrinking, shrink fitting, or snap fitting. In this case, the development ring 30 fixed to the outer periphery of the first inner layer 11 of the distal end section S3 can facilitate positioning.

In some examples, as shown in fig. 4, the developer ring 30 may partially cover the first inner layer 11 of the distal segment S3.

In some examples, as shown in fig. 4 or 6, the first polymer-like layer 14 of the distal segment S3 may extend from the transition segment S2 and cover the outside of the first inner layer 11 and the outside of the developer ring 30.

In some examples, since the first polymer layer 14 includes the first polymer layer a, the second polymer layer b, the third polymer layer c, and the fourth polymer layer d, the fourth polymer layer d may cover the outer side of the developing ring 30. That is, developer ring 30 may be disposed on the outer periphery of first inner layer 11 covered with fourth polymer layer d in distal segment S3. In some examples, as shown in fig. 4, developer ring 30 may be disposed at the outer periphery of first inner layer 11 covered with fourth polymer layer d in distal segment S3 and partially cover first inner layer 11.

In some examples, the developer ring 30 may be composed of a resin and a developer material. The developing material may be at least one of radiopaque metals or metal compounds such as gold, platinum, iridium, platinum-iridium alloy, barium sulfate, bismuth-based compounds, zirconium oxide, tantalum, cobalt-chromium alloy, tungsten-based compounds, stainless steel, and titanium. The bismuth-based compound may be, for example, bismuth oxide, bismuth trioxide, bismuth oxycarbonate, bismuth subcarbonate or bismuth tungstate. The tungsten compound may be, for example, tungsten oxide, tungsten dioxide, or tungsten trioxide.

In some examples, the developing material may be in powder form.

In some examples, the developing material content may be 30% to 90%. That is, the developing material may be 30% to 90% of the total mass of the resin and the developing material.

In the utility model relates to a two-chamber microcatheter 1 with development ring, the seal wire can move through the first seal wire inner chamber of first body 10, can also move through the second seal wire inner chamber of second body 20, first body 10 includes proximal end section S1, changeover portion S2 and distal end section S3, proximal end section S1 has first inlayer 11, spring layer 12, weaving layer 13 and polymer layer, changeover portion S2 has first inlayer 11, partly cover spring layer 12 and the polymer layer at first inlayer 11, distal end section S3 has first inlayer 11 and polymer layer, second body 20 has second inlayer and polymer layer, second body 20 has hookup section K1 and most advanced section K2. Developer ring 30 is secured to the outer periphery of first inner layer 11 of distal segment S3. Under the condition, the gradually-contracted tip section K2 can help the double-cavity micro catheter 1 to be pushed, the first inner layer 11, the spring layer 12, the woven layer 13 and the polymer layer of the first tube body are sequentially arranged from inside to outside, so that the pushing performance of the tube body is improved, the developing ring fixed on the periphery of the first inner layer 11 can be conveniently positioned and reduce the influence on the flexibility of the double-cavity micro catheter, and the part of the first tube body 10 connected with the second tube body 20 has better flexibility and can form good transition with the near end section S1, so that the double-cavity micro catheter 1 with the developing ring, which is convenient to position, strong in pushing performance, strong in flexibility, good in tensile strength and good in bending resistance, can be provided.

Fig. 6 is a schematic structural section view along the CC' direction in fig. 2, showing an example of the present invention. Fig. 7 is a schematic structural cross-sectional view showing modification 1 in the CC' direction in fig. 2 according to an example of the present invention.

In other examples, the first and second pipes 10 and 20 may be arranged in a side-by-side manner, and the first and second pipes 10 and 20 may be fixed in a thermoplastic manner by a sheathing protection pipe. Therefore, the process difficulty can be reduced.

In some examples, the second tube 20 can include a third type polymer layer 23 (see fig. 7). Wherein the third type polymer layer 23 can be coated outside the second type polymer layer 22. This can improve the stability of the double-lumen microcatheter 1 as a whole.

In some examples, the first type of polymer layer 14, the second type of polymer layer 22, and the third type of polymer layer 23 may be different materials. In some examples, the second type of polymer layer 22 and the third type of polymer layer 23 may be the same material.

In some examples, the first type of polymer layer 14 and the third type of polymer layer 23 may be the same material. In this case, at the coupling portion of the first pipe body 10 and the coupling segment K1, the first polymer layer 14 and the third polymer layer 23 are regarded as the first polymer layer 14, and the first polymer layer 14 covers the second polymer layer 22 (see fig. 6), that is, the first polymer layer 14 covers the coupling segment K1. This improves the coupling between the first tube 10 and the second tube 20, thereby improving the stability of the double-lumen microcatheter 1 as a whole.

In other examples, tip segment K2 may have an inner tube and an outer tube. The outer tube may be arranged outside the inner tube. In some examples, the tip section K2 is joined with the coupling section K1 by welding the inner tube to the coupling section K1 and sleeving and welding the outer tube to the inner tube. This can improve the pushability of tip segment K2.

In other examples, tip segment K2 may be provided with a developer ring (not shown). The developer ring may be fixed on the outer circumference of the inner tube or the outer tube of tip section K2.

In other examples, the inner tube may extend from the outer tube along the length of the second tube body 20. In this case, when the elastic modulus of the inner tube is smaller than that of the outer tube, tip section K2 can further lower the elastic modulus of the end of tip section K2 remote from the junction; when the elastic modulus of the inner tube is larger than that of the outer tube, the capacity of the double-cavity micro-catheter 1 for penetrating through a lesion area can be improved; when the modulus of elasticity of the inner tube is equal to the modulus of elasticity of the outer tube, the modulus of elasticity of the end of tip section K2 remote from the junction can also be reduced, thereby reducing the likelihood of the occurrence of a damaged vessel.

In some examples, the outer tube has a modulus of elasticity less than the modulus of elasticity of the coupling section K1 and the inner tube has a modulus of elasticity less than the modulus of elasticity of the coupling section K1. As a result, the overall modulus of elasticity of tip section K2 can be reduced, thereby improving the flexibility of tip section K2. In other examples, the modulus of elasticity of the tip section K2 is less than the modulus of elasticity of the coupling section K1. Thereby, the pushability and reliability of the double lumen microcatheter 1 having the developing ring can be improved. In some examples, the outer tube may taper from an end proximate the joint to an end distal from the joint. This reduces the modulus of elasticity of the end of the tip section K2 remote from the joint, thereby increasing the compliance.

In some examples, the dual lumen microcatheter 1 further comprises a coating applied to the inner wall of the first and second guidewire lumens. Thereby, the guide wire can be conveniently passed through the double-cavity micro-catheter 1. In particular, the coating may be a high lubricity hydrophilic polymer. In other examples, the coating may also be applied to the outer wall of the first type of polymer layer 14 and the second type of polymer layer 22 of the double lumen microcatheter 1. Thereby, the friction force can be reduced to facilitate pushing.

Fig. 8 is a schematic cross-sectional view showing a pipe body according to modification 2 of fig. 2 along the AA' direction according to an example of the present invention. Fig. 9 is a schematic structural cross-sectional view showing modification 2 in the CC' direction in fig. 2 according to an example of the present invention.

In modification 2, as shown in fig. 8 and 9, the development ring 30A may be located at the distal end section S3, and the development ring 30A may be fixed to the outer circumference of the double-lumen microcatheter 1. Specifically, the first tube 10 and the second tube 20 may be formed into the double-lumen micro-catheter 1 by heat melting, thermal molding, heat shrinking, or the like, the developing ring 30A may be fixed on the outer circumference of the double-lumen micro-catheter 1, and the developing ring 30A is located at the distal end section S3. Wherein, the fixing mode can be one of hot melting, thermoplastic, thermal shrinkage, sleeve welding or buckling. The developer ring can thereby be secured to the distal section by one of heat fusing, heat shrinking, shrink fitting, or snapping. In this case, the developing ring 30A fixed to the outer periphery of the double-lumen microcatheter 1 can facilitate positioning.

In some examples, as shown in fig. 8, the visualization loop 30A may be located at the distal segment S3, and the visualization loop 30A may partially cover the outer circumference of the double lumen microcatheter 1.

In other examples, the first and second pipes 10 and 20 may be arranged in a side-by-side manner, and the first and second pipes 10 and 20 may be fixed in a thermoplastic manner by a sheathing protection pipe. Therefore, the process difficulty can be reduced. Among them, the developing ring 30A may be disposed on the outer circumference of the protective tube. The disclosure is not limited thereto, and the developing ring 30A may be disposed on an inner wall of the protective pipe, in other words, the protective pipe may cover an outer circumference of the developing ring 30A.

While the present invention has been described in detail in connection with the drawings and the examples, it is to be understood that the above description is not intended to limit the present invention in any way. The present invention may be modified and varied as necessary by those skilled in the art without departing from the true spirit and scope of the invention, and all such modifications and variations are intended to be included within the scope of the invention.

Claims (12)

1. A double-cavity micro catheter with a developing ring is characterized in that,

the double-cavity micro catheter comprises a developing ring, a first catheter body and a second catheter body, wherein the first catheter body is provided with a near-end section, a transition section and a far-end section which are sequentially connected, and the second catheter body is provided with a connecting section which is jointed on the periphery of the first catheter body and a tip section which is connected with the connecting section and is gradually contracted;

the first tube body has a first guide wire lumen slidably receiving a guide wire, and in the first tube body, the proximal end section has a first inner layer forming the first guide wire lumen, a spring layer wound in a wound manner around the first inner layer and arranged in a longitudinal direction of the first inner layer, a braid layer partially disposed on an outer side of the spring layer, and a first polymer-like layer covering an outer side of the braid layer; the transition section has a first inner layer extending from the proximal section, a spring layer extending from the proximal section and partially covering an outer side of the first inner layer, and the first polymer-like layer extending from the proximal section and covering an outer side of the spring layer; the distal segment having a first inner layer extending from the transition segment and a first polymer-like layer extending from the transition segment and overlying an outer side of the first inner layer;

the second tube body having a second guidewire lumen slidably receiving a guidewire, the second tube body having a second inner layer forming the second guidewire lumen and a second polymer-like layer overlying an outer side of the second inner layer, the coupling section of the second tube body being at least partially coupled with the transition section of the first tube body,

the development ring is fixed on the periphery of the first inner layer of the distal end section, and the first polymer layer of the distal end section covers the outer side of the development ring.

2. A double-cavity micro catheter with a developing ring is characterized in that,

the double-cavity micro catheter comprises a developing ring, a first catheter body and a second catheter body, wherein the first catheter body is provided with a near-end section, a transition section and a far-end section which are sequentially connected, and the second catheter body is provided with a connecting section which is jointed on the periphery of the first catheter body and a tip section which is connected with the connecting section and is gradually contracted;

the first tube body has a first guide wire lumen slidably receiving a guide wire, and in the first tube body, the proximal end section has a first inner layer forming the first guide wire lumen, a spring layer wound in a wound manner around the first inner layer and arranged in a longitudinal direction of the first inner layer, a braid layer partially disposed on an outer side of the spring layer, and a first polymer-like layer covering an outer side of the braid layer; the transition section has a first inner layer extending from the proximal section, a spring layer extending from the proximal section and partially covering an outer side of the first inner layer, and the first polymer-like layer extending from the proximal section and covering an outer side of the spring layer; the distal segment having a first inner layer extending from the transition segment and a first polymer-like layer extending from the transition segment and overlying an outer side of the first inner layer;

the second tube body having a second guidewire lumen slidably receiving a guidewire, the second tube body having a second inner layer forming the second guidewire lumen and a second polymer-like layer overlying an outer side of the second inner layer, the coupling section of the second tube body being at least partially coupled with the transition section of the first tube body,

the developing ring is fixed on the periphery of the double-cavity micro catheter and is positioned at the distal section.

3. The double lumen microcatheter of claim 1 or 2, wherein:

the fixing mode of the developing ring is one of hot melting, thermoplastic molding, thermal shrinkage, sleeve welding or buckling.

4. The double lumen microcatheter of claim 1 or 2, wherein:

the transition section has a spring layer ending at an initial position at a junction of the first tube and the second tube.

5. The double lumen microcatheter of claim 1 or 2, wherein:

in the first tube, the flexibility of the proximal section, the flexibility of the transition section and the flexibility of the distal section are gradually reduced, in the second tube, the flexibility of the coupling section and the flexibility of the tip section are gradually reduced, the outer diameter of the transition section is gradually reduced from the proximal section side to the distal section side, and the flexibility of the transition section is gradually reduced, in the coupling portion of the first tube and the coupling section, the first polymer layer also wraps the coupling section so that the first polymer layer covers the second polymer layer, and the first tube is not in contact with the tip section of the second tube.

6. The dual lumen microcatheter of claim 1, wherein:

the first polymer layer comprises a first polymer layer with a first hardness and arranged at the proximal end section, a second polymer layer with a second hardness and arranged at the transition section, a third polymer layer with a third hardness and arranged at the distal end section, and a fourth polymer layer which is connected with the third polymer layer and has a fourth hardness, wherein the fourth polymer layer covers the outer side of the developing ring;

the polymer layers of the second type include a fifth polymer layer having a fifth hardness, a sixth polymer layer connected to the fifth polymer layer and having a sixth hardness, a seventh polymer layer connected to the sixth polymer layer and having a seventh hardness, an eighth polymer layer connected to the seventh polymer layer and having an eighth hardness, and a ninth polymer layer having a ninth hardness.

7. The dual lumen microcatheter of claim 6, wherein:

the third hardness is equal to the sixth hardness, the fourth hardness is equal to the seventh hardness, and the first hardness, the second hardness, the fifth hardness, the third hardness, the fourth hardness, the eighth hardness, and the ninth hardness are gradually decreased.

8. The dual lumen microcatheter of claim 6, wherein:

the first hardness, the second hardness, the fifth hardness, the third hardness, the fourth hardness, the sixth hardness, the seventh hardness, the eighth hardness, and the ninth hardness are gradually decreased.

9. The double lumen microcatheter of claim 1 or 2, wherein:

the spring layer is made by spirally winding a wire material on the first inner layer in a winding manner, and the braid layer is made by braiding a braided wire material on an outer side of the spring layer.

10. The dual lumen microcatheter of claim 1, wherein:

the first polymer layer comprises a first polymer layer which is arranged at the proximal section and has a first elastic modulus, a second polymer layer which is arranged at the transition section and has a second elastic modulus, a third polymer layer which is arranged at the distal section and has a third elastic modulus, and a fourth polymer layer which is connected with the third polymer layer and has a fourth elastic modulus, wherein the fourth polymer layer covers the outer side of the developing ring;

the polymer layers of the second class include a fifth polymer layer having a fifth modulus of elasticity, a sixth polymer layer connected to the fifth polymer layer and having a sixth modulus of elasticity, a seventh polymer layer connected to the sixth polymer layer and having a seventh modulus of elasticity, an eighth polymer layer connected to the seventh polymer layer and having an eighth modulus of elasticity, and a ninth polymer layer having a ninth modulus of elasticity.

11. The dual lumen microcatheter of claim 10, wherein:

the third elastic modulus is equal to the sixth elastic modulus, the fourth elastic modulus is equal to the seventh elastic modulus, and the first elastic modulus, the second elastic modulus, the fifth elastic modulus, the third elastic modulus, the fourth elastic modulus, the eighth elastic modulus, and the ninth elastic modulus are gradually decreased.

12. The dual lumen microcatheter of claim 10, wherein:

the first elastic modulus, the second elastic modulus, the fifth elastic modulus, the third elastic modulus, the fourth elastic modulus, the sixth elastic modulus, the seventh elastic modulus, the eighth elastic modulus, and the ninth elastic modulus are gradually decreased.

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