Balloon guiding catheter

Abstract

The invention discloses a balloon guiding catheter which comprises an outer tube provided with an outer tube body, a sleeve arranged outside the outer tube body in a sleeving mode and a cavity formed between the outer tube body and the sleeve. A through hole for communicating the inner side of the outer tube body with the cavity is formed in the outer tube body, so that the sleeve can be attached to the outer side wall of the outer tube body in a negative pressure state. When negative pressure suction is carried out on the inner side of the outer tube, the cavity of the outer tube can be kept stable, and meanwhile when negative pressure suction is not carried out on the inner side of the outer tube, the outer tube has certain flexibility, so that the outer tube can smoothly enter a bent blood vessel.

Description

Technical Field

[0001] The invention relates to the technical field of medical catheters, in particular to a balloon guide catheter. Background Art

[0002] As a minimally invasive treatment method, endovascular interventional diagnosis and treatment has developed rapidly in recent years with the advancement of imaging equipment and the introduction and improvement of new interventional equipment. Balloon guide catheters are widely used in interventional treatments such as thrombectomy. In interventional treatments, the balloon is expanded to adhere to the vessel wall, temporarily blocking blood flow to protect the distal end of the vessel. At the same time, the catheter is withdrawn through the contraction of the balloon to restore blood flow.

[0003] The outer tube of the balloon guide catheter in the prior art is generally a single-layer polymer extruded tube, which has a weak ability to withstand negative pressure. When the balloon is emptied by negative pressure suction, it is easy to cause the outer tube cavity to collapse, resulting in excessive extension of the balloon emptying time. In order to avoid the collapse of the outer tube cavity when the balloon is emptied by negative pressure suction, the hardness of the catheter can be increased by strengthening the outer tube, but as the hardness of the catheter increases, its flexibility will decrease, making it difficult for the catheter to enter the complex and tortuous blood vessels and insufficiently in place.

[0004] In view of this, how to provide a balloon guide catheter to ensure that the balloon maintains the stability of the outer tube cavity during negative pressure suction, while ensuring that the catheter has a certain degree of flexibility so that it can smoothly enter the curved blood vessels is a problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a method for manufacturing a balloon guide catheter to solve the shortcomings of the prior art. It can keep the cavity of the outer tube stable when negative pressure suction is performed on the inner side of the outer tube, and at the same time, when negative pressure suction is not performed on the inner side of the outer tube, the outer tube has a certain flexibility so that the outer tube can smoothly enter the curved blood vessel.

[0006] The balloon guide catheter provided in an embodiment of the present invention comprises: an outer tube, comprising an outer tube body, a sleeve arranged outside at least part of the outer tube body, and a cavity formed between the outer tube body and the sleeve; the outer tube body is at least partially provided with a through hole connecting the inner side of the outer tube body and the cavity, so that the sleeve can be attached to the outer side wall of the outer tube body under negative pressure.

[0007] Furthermore, the outer tube body is a hypotube and has a cutting pattern, and the through hole is a part of the cutting pattern.

[0008] Furthermore, the outer tube body is formed with a plurality of circumferential rods and connecting members connecting adjacent circumferential rods, the plurality of circumferential rods are arranged along the axial direction of the outer tube body; the plurality of connecting members are arranged along the circumferential direction of the outer tube body, and the through hole is formed between two adjacent circumferential rods and two adjacent connecting members.

[0009] Furthermore, several of the connecting parts are arranged along the circumferential direction of the outer tube body to form a connecting assembly, and several of the connecting assemblies are arranged along the axial direction of the outer tube body; the connecting parts of one connecting assembly and the connecting parts in the adjacent connecting assembly are staggered with each other in the axial direction of the outer tube body.

[0010] Further, the circumferential rod has a plurality of first protrusions protruding toward the proximal end of the outer tube body and a plurality of second protrusions protruding toward the distal end of the outer tube body;

[0011] A plurality of first protrusions are arranged along the circumferential direction of the circumferential rod, a plurality of second protrusions are arranged along the circumferential direction of the circumferential rod, and the first protrusions and the second protrusions are arranged at intervals; a first recess opening toward the proximal end of the outer tube body is formed between two adjacent first protrusions, and a second recess opening toward the distal end of the outer tube body is formed between two adjacent second protrusions;

[0012] Two ends of the connecting rod are respectively connected and fixed to a first protrusion of a circumferential rod and a second protrusion of an adjacent circumferential rod.

[0013] Furthermore, both ends of the sleeve are respectively fixed on the outer tube body along the axial direction of the outer tube body;

[0014] The outer tube body is a hypotube; the sleeve is made of a thermoplastic polymer material, and both ends of the sleeve are respectively heat-shrink molded on the outer tube body.

[0015] Furthermore, the sleeve comprises a sleeve body and a pair of pins arranged on the sleeve body, wherein the pair of pins are arranged opposite to each other along the axial direction of the sleeve body and fixed on the outer tube body; the cavity is formed between the sleeve body and the outer tube body.

[0016] Furthermore, the balloon guide catheter also has an inner tube arranged in the outer tube body and a balloon arranged at the distal end of the inner tube, the inner tube has a first channel; a second channel is formed between a portion of the outer wall of the inner tube and a portion of the inner wall of the outer tube body; the second channel is connected to the cavity through the through hole, and the balloon has a balloon cavity connected to the second channel; when the second channel is in a negative pressure state, the sleeve is attached to the outer wall of the outer tube body.

[0017] Furthermore, the hardness of the inner tube gradually increases from the distal end to the proximal end;

[0018] The inner tube comprises an inner liner tube, an inner liner sleeve arranged outside the inner liner tube, and a reinforcement layer arranged between the inner liner tube and the inner liner sleeve; the reinforcement layer is a metal coil;

[0019] The hardness of the liner sleeve gradually increases from the distal end to the proximal end.

[0020] Another embodiment of the present invention further discloses a balloon guide catheter, comprising:

[0021] The outer tube has an outer tube body and a sleeve located outside the outer tube body; the outer tube body is a metal piece and has a plurality of circumferential rods and connecting pieces connecting adjacent circumferential rods, and the plurality of circumferential rods are arranged along the axial direction of the outer tube body.

[0022] Compared with the prior art, the balloon guide catheter of the present invention arranges the outer tube into two layers, namely, an outer tube body and a sleeve, and forms a cavity between the outer tube body and the sleeve; when the balloon is emptied by negative pressure suction, the cavity is compressed, and the sleeve can be attached to the outer tube body and form a wrap around the outer tube body, thereby playing the role of thickening the tube wall of the outer tube body. The thickening of the tube wall of the outer tube body can enhance the supporting strength of the outer tube body when the inner side of the outer tube body is in a negative pressure state, avoid the collapse of the cavity, and thus avoid the problem of excessive extension of the balloon emptying time; when negative pressure suction is not performed, the outer tube body and the sleeve are separated by the cavity, and the outer tube is relatively soft, which can keep the outer tube sufficiently flexible, thereby facilitating the outer tube to enter complex and tortuous blood vessels; when negative pressure suction is performed on the inner side of the outer tube, the cavity of the outer tube can be kept stable, and at the same time, when negative pressure extraction is not performed on the inner side of the outer tube, the outer tube has a certain flexibility, so that the outer tube can smoothly enter the curved blood vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the balloon guide catheter disclosed in the present invention;

[0024] Figure 2 It is a schematic diagram of the installation structure of the catheter seat, the outer tube and the inner tube in the balloon guide catheter disclosed in the present invention;

[0025] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0026] Figure 4 It is a schematic diagram of the installation structure of the balloon, the outer tube and the inner tube in the balloon guide catheter disclosed in the present invention;

[0027] Figure 5 It is a schematic structural diagram of the sleeve of the outer tube in the balloon guide catheter disclosed in the present invention in the second state;

[0028] Figure 6It is a schematic structural diagram of the sleeve of the outer tube in the balloon guide catheter disclosed in the present invention in the first state;

[0029] Figure 7 It is a structural schematic diagram of the outer tube body in the balloon guide catheter disclosed in the present invention;

[0030] Figure 8 yes Figure 7 A partial enlarged view of point B in the middle;

[0031] Fig. 9 It is a schematic diagram of the internal structure of the inner tube in the balloon guide catheter disclosed in an embodiment of the present invention;

[0032] Description of reference numerals: 1-outer tube, 10-second channel, 11-outer tube body, 110-through hole, 111-circumferential rod, 1111-first protrusion, 1112-second protrusion,

[0033] 112-Connector,

[0034] 12-sleeve, 121-sleeve body, 122-pin, 13-cavity,

[0035] 2-inner pipe, 20-first channel, 21-lining sleeve, 22-reinforcement layer,

[0036] 3-balloon, 30-balloon cavity, 4-catheter seat, 41-main cavity, 42-side cavity. DETAILED DESCRIPTION

[0037] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

[0038] It should be understood that, unless otherwise clearly specified and limited, in the description of the present invention, the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, the connection can be a direct connection or an indirect connection through an intermediate medium, and can be a fixed connection, a movable connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] For the convenience of description, the perspective of the instrument operator during the use of the balloon guide catheter is used as a reference, and the end away from the operator is defined as the distal end, and the end close to the operator is defined as the proximal end.

[0040] like Figure 1-4 As shown, the present invention discloses a balloon guide catheter, comprising: an outer tube 1, an inner tube 2 and a balloon 3;

[0041] The inner tube 2 has a first channel 20 and is located inside the outer tube 1 , and a second channel 10 is formed between a portion of the outer wall of the inner tube 2 and a portion of the inner wall of the outer tube 1 ; the balloon 3 is arranged at the distal ends of the inner tube 2 and the outer tube 1 and has a balloon cavity 30 connected to the second channel 10 .

[0042] The second channel 10 serves as a fluid channel, and fluid can be injected into the balloon cavity 30 of the balloon 3 through the second channel 10. The balloon 3 expands due to the filling of the fluid. After the balloon 3 expands, its periphery adheres to the blood vessel wall to form a local blockage of the blood vessel, temporarily blocking the blood flow to protect the distal blood vessel.

[0043] When the balloon 3 is emptied by negative pressure suction, suction is drawn outward through the second channel 10 to shrink the balloon 3. When the fluid flows outward in the second channel 10, negative pressure is formed, thereby compressing the outer tube 1. When the supporting strength of the outer tube 1 is weak, the cavity of the second channel 10 is easily collapsed.

[0044] The balloon guide catheter disclosed in the present invention is as follows Figure 1-6 As shown, the outer tube 1 comprises an outer tube body 11, a sleeve 12 sleeved outside the outer tube body 11, and a cavity 13 formed between the outer tube body 11 and the sleeve 12; the second channel 10 is formed between a part of the inner wall of the outer tube body 11 and a part of the outer wall of the inner tube 2;

[0045] The outer tube body 11 is provided with a through hole 110 communicating the inner side of the outer tube body 11 and the cavity 13 , so that the sleeve 12 can be attached to the outer side wall of the outer tube body 11 under negative pressure.

[0046] When the balloon cavity 30 is emptied by negative pressure suction, the second channel 10 located on the inner side of the outer tube body 11 is in a negative pressure state. Since a through hole connecting the sleeve 12 is provided on the outer tube body 11, the sleeve 12 is also in a negative pressure state. Under the adsorption effect of negative pressure, the sleeve 12 can fit on the outer wall of the outer tube body 11.

[0047] In this embodiment, the outer tube 1 is configured to have two layers, namely an outer tube body 11 and a sleeve 12. When the balloon 3 is emptied by negative pressure suction, the cavity 13 can be compressed to allow the sleeve 12 to fit onto the outer tube body 11 and wrap around the outer tube body 11, thereby thickening the wall of the outer tube body 11. The thickening of the wall of the outer tube body 11 can enhance the supporting strength of the outer tube body 11 when the inner side of the outer tube body 11 is in a negative pressure state, thereby avoiding the collapse of the cavity and further avoiding the problem of excessively prolonged emptying time of the balloon 3; at the same time, it can assist the rapid passage of instruments and can have a certain straightening effect on tortuous blood vessels.

[0048] When no negative pressure suction is performed, the outer tube body 11 and the sleeve 12 are separated by the cavity 13. At this time, the cavity 13 expands slightly. The cavity 13 can also be set to be attached to the sleeve 12, but because there is no adsorption effect of negative pressure, the sleeve 12 is only in contact with the outer tube body 11, and does not play a role in wrapping the outer tube body 11, and thus cannot play a role in enhancing the strength of the outer tube body 11. In this state, the outer tube 1 is relatively soft as a whole, so that the outer tube 1 maintains sufficient flexibility, so that the outer tube 1 can easily enter the complex and tortuous blood vessels; the above-mentioned balloon guide catheter can keep the cavity of the outer tube 1 stable when negative pressure suction is performed in the outer tube 1, and at the same time, when negative pressure extraction is not performed in the outer tube 1, the outer tube 1 has a certain degree of flexibility, so that the outer tube 1 can smoothly enter the curved blood vessels.

[0049] When negative pressure suction is not performed inside the outer tube body 11, the sleeve 12 is in a first state, at which a cavity 13 is formed between the sleeve 12 and the outer tube body 11, and the outer tube body 11 and the sleeve 12 are separated by the cavity 13;

[0050] When negative pressure suction is performed inside the outer tube body 11 , the sleeve 12 is in the second state, and the cavity 13 is compressed under the action of negative pressure so that the sleeve 12 fits the outer tube body 11 .

[0051] In this embodiment, the expansion or compression of the cavity 13 between the outer tube body 11 and the sleeve 12 is controlled so as to control the fitting and separation of the outer tube body 11 and the sleeve 12 .

[0052] In this embodiment, the power for compressing the cavity 13 comes from the negative pressure in the second channel 10. Such a structural setting can make the cavity 13 compressed more timely, and enable the sleeve 12 to adjust its state more quickly and efficiently according to the negative pressure conditions inside the outer tube body 11, that is, in the second channel 10.

[0053] Of course, in other embodiments, the through hole 110 may not be provided on the outer tube body 11, the cavity 13 is not connected to the first channel 20, and the cavity 13 has special air holes to adjust the compression or expansion of the cavity 13. At this time, a special control device is required to control the change of the air pressure in the cavity 13, that is, to control the expansion and contraction of the cavity 13. When the sleeve 12 is under negative pressure, the cavity 13 is compressed. After the sleeve 12 is bonded to the outer tube body 11, the tube wall of the outer tube 1 is actually bonded by two layers of tubes.

[0054] like Figure 5-6 As shown, in this embodiment, the two ends of the sleeve 12 along the axial direction of the outer tube body 11 are respectively connected to the outer tube body 11; in order to facilitate the arrangement of the sleeve 12, the sleeve 12 has a sleeve body 121 and a pair of pins 122 arranged on the sleeve body 121, and the pair of pins 122 are relatively arranged along the axial direction of the sleeve body 121 and fixed on the outer tube body 11; the cavity 13 is formed between the sleeve body 121 and the outer tube body 11.

[0055] In this embodiment, the two ends of the sleeve 12 are fixed to the outer side wall of the outer tube body 11 by the pins 122 respectively. After the two ends of the sleeve 12 are fixed by the pins 122 respectively, the sleeve body 121 as a whole is slightly arched in the direction away from the outer tube body 11. When the compression cavity 13 is used, part of the sleeve 12 is contracted to achieve fit with the outer tube body 11.

[0056] In other embodiments, the sleeve 12 may be an elastic member, which expands and deforms synchronously with the expansion of the cavity 13 , and resets and fits against the outer wall of the outer tube body 11 when the cavity 13 is compressed.

[0057] In this embodiment, the sleeve 12 is made of a thermoplastic polymer material, and both ends of the sleeve 12 along the axial direction can be heat-shrink molded on the outer tube body 11, but the sleeve body 121 portion at the middle position of the sleeve 12 is not combined with the outer tube body 11. Specifically, the material of the sleeve 12 can be, for example, one or more of a polyurethane material, a polyethylene material, a polymethyl methacrylate material, or a polypropylene material.

[0058] In this embodiment, in order to better improve the stability of the outer tube 1, the outer tube body 11 is a metal part. Specifically, the outer tube body 11 is a hypotube.

[0059] In this embodiment, the outer tube 1 actually uses the outer tube body 11 of the cut nickel-titanium hypotube as a reinforcement layer, and a sleeve 12 of a polymer coated sleeve is arranged outside the outer tube body 11. Both ends of the sleeve 12 are heat-shrunk on the outer tube body 11, and a layer cavity 13 is formed between the middle of the sleeve 12 and the hypotube.

[0060] In this embodiment, since the outer tube body 11 is a sea wave tube, a cutting pattern is formed on the sea wave tube, and the cutting pattern includes a plurality of holes arranged in the circumferential direction of the sea wave tube body and a plurality of holes arranged in the axial direction of the sea wave tube body. The through hole 110 is a part of the cutting pattern.

[0061] In a specific embodiment, Figure 7 As shown, the cutting pattern of the outer tube body 11 includes a plurality of through holes 110 , a plurality of the through holes 110 are arranged along the circumferential direction of the outer tube body 11 , and a plurality of the through holes 110 are arranged along the axial direction of the outer tube body 11 .

[0062] A plurality of through holes 110 are arranged along the circumferential direction and the axial direction of the outer tube body 11 to form a cutting pattern on the entire outer tube body 11 , thereby improving the pushing performance of the outer tube 1 and also improving the flexibility of the outer tube 1 .

[0063] like Figure 7-8 As shown, in order to better improve the supporting performance of the outer tube body 11, a plurality of circumferential rods 111 and connecting members 112 connecting adjacent circumferential rods 111 are formed on the outer tube body 11, and the plurality of circumferential rods 111 are arranged along the axial direction of the outer tube body 11; the plurality of connecting members 112 are arranged along the circumferential direction of the outer tube body 11, and the through hole 110 is formed between two adjacent circumferential rods 111 and two adjacent connecting members 112.

[0064] like Figure 7-8 As shown, in this embodiment, the longitudinal connecting member 112 and the circumferential rod member 111 are crossed with each other to form an outer tube body 11 with an approximately mesh structure. The circumferential rod member 111 can better achieve the pushing performance of the outer tube 1, and the setting of the circumferential rod member 111 can make the cavity of the outer tube body 11 have more stable support.

[0065] The formation of the circumferential rod 111 and the connecting member 112 is actually a cutting pattern formed after cutting the through hole 110 on the metal tube. The circumferential rod 111 and the connecting member 112 are integrally formed by laser cutting. Compared with the reinforcement layer formed by weaving, it has better stability and stronger pressure resistance, so it can play a better role in maintaining the cavity.

[0066] In this embodiment, the arrangement of the above structure of the outer tube body 11 not only ensures the pushing performance of the outer tube 1 but also takes into account the maintenance of the cavity of the outer tube 1.

[0067] Further, such as Figure 7-8As shown, a plurality of the connecting members 112 are arranged along the circumferential direction of the outer tube body 11 to form a longitudinal pushing assembly, and a plurality of the longitudinal pushing assemblies are arranged along the axial direction of the outer tube body 11; two adjacent longitudinal pushing assemblies are staggered with each other in the axial direction of the outer tube body 11.

[0068] The two adjacent groups of longitudinal pushing assemblies are respectively the first longitudinal pushing assembly and the second longitudinal pushing assembly. The two groups of longitudinal pushing assemblies are separated by the circumferential rod 111. The connecting parts on the first longitudinal pushing assembly and the connecting parts on the second longitudinal pushing assembly are not opposite to each other, and the two are staggered with each other in the axial direction of the outer tube body 11.

[0069] In a specific embodiment, Figure 8 As shown, the circumferential rod 111 has a plurality of first protrusions 1111 protruding toward the proximal end of the outer tube body 11 and a plurality of second protrusions 1112 protruding toward the distal end of the outer tube body 11, the plurality of first protrusions 1111 are arranged along the circumferential direction of the circumferential rod 111, the plurality of second protrusions 1112 are arranged along the circumferential direction of the circumferential rod 111, and the first protrusions 1111 and the second protrusions 1112 are arranged at intervals. The first protrusions 1111 of the circumferential rod 111 are opposite to the second protrusions 1112 of the adjacent circumferential rod 111. The first end of the longitudinal push rod 112 is fixed to the first protrusion 1111 of the circumferential rod 111, and the second end of the connecting member 112 is fixed to the second protrusion 1112 of another adjacent circumferential rod 111.

[0070] A first depression is formed between two adjacent first protrusions 1111, and a second depression is formed between two adjacent second protrusions 1112. The above arrangement makes the circumferential rod 111 wave-shaped as a whole along the circumferential direction. The wave-shaped circumferential rod 111 has a more stable support and can better maintain the cavity to avoid the collapse of the cavity. The connecting members 112 are staggered in the axial direction to enhance the torsion resistance of the outer tube body 11, thereby better improving the pushing performance of the outer tube 1.

[0071] In this embodiment, along the axial direction of the inner tube 2, the hardness of the inner tube 2 gradually increases as it moves away from the distal end of the inner tube 2, that is, the hardness of the inner tube gradually increases from the distal end to the proximal end. The hardness of the inner tube 2 becomes softer in stages, and the distal end of the inner tube 2 is the softest, so as to avoid damaging the blood vessels during delivery. As the hardness of the distal end away from the inner tube 2 gradually increases, the entire balloon guide catheter has better pushability.

[0072] The gradual increase of hardness instead of sudden change can better avoid the inner tube 2 from being bent or knotted at the sudden change position, thereby affecting the pushing performance.

[0073] In this embodiment, if Fig. 9As shown, the inner tube 2 includes an inner lining tube, an inner lining sleeve 21 sleeved outside the inner lining tube, and a reinforcing layer 22 arranged between the inner lining tube 21 and the inner lining sleeve; the reinforcing layer 22 is a metal coil; the hardness of the inner lining sleeve 21 gradually increases with the distance from the distal end of the inner tube 2, that is, the hardness of the inner lining sleeve gradually increases from the distal end to the proximal end.

[0074] The inner lining pipe can be made of polytetrafluoroethylene material, and the inner lining sleeve 21 is made of thermoplastic polymer material. During the molding process of the inner lining sleeve 21, its hardness is changed by external stimulation. The specific material of the inner lining sleeve 21 can be polyurethane material, hydrogel material, etc. It should be noted that how to form a polymer material tube with variable hardness is a prior art and is not specifically limited or expanded here.

[0075] In this embodiment, the metal coil may be, for example, a spring coil. Of course, in other embodiments, the metal coil may also be a hypotube formed by laser cutting.

[0076] In this embodiment, the reinforcement layer 22 is provided to enable the inner tube to have good anti-kink and anti-oval capabilities, enhance the inner tube's cavity retention ability, and avoid collapse and flattening of the inner tube 2 caused by negative pressure evacuation of the balloon 3 and withdrawal of the thrombectomy device.

[0077] It is understandable that if Figure 2-3 As shown, the balloon guide catheter also includes a catheter seat 4, which is Y-shaped and has a main cavity 41 and a side cavity 42. The main cavity 41 of the catheter seat 4 is connected to the first channel 20 of the inner tube 2, and can be used for microcatheters, stents, suction catheters, intermediate catheters, guide wires and other matching instruments to pass through. The side cavity 42 of the catheter seat 4 is connected to the second channel 10, and is used to fill and deflate the balloon 3.

[0078] The structure of the catheter seat, the connection structure between the catheter seat and the outer tube 1 and the inner tube 2, etc. can all be based on the existing technology, and will not be described in detail here.

[0079] Another embodiment of the present invention further discloses a balloon guide catheter, comprising:

[0080] The outer tube 1 has an outer tube body 11 and a sleeve 12 located outside the outer tube body 11; the outer tube body 11 is a metal part and has a plurality of circumferential rods 111 and a connecting piece 112 connecting adjacent circumferential rods 111, and the plurality of circumferential rods 111 are arranged along the axial direction of the outer tube body 11.

[0081] The outer tube 1 disclosed in the present invention adopts a double-layer structure. The outer tube body 11 as the inner layer adopts a metal part to support the outer tube 1 cavity by setting a circumferential rod 111. The pushability of the outer tube 1 is conveniently realized by the connecting piece 112 extending along the axial direction of the outer tube body 11. The arrangement of the above structure not only ensures the pushing performance of the outer tube 1 but also takes into account the maintenance of the outer tube 1 cavity.

[0082] The specific structures of the circumferential rod 111 and the connecting member 112 refer to the description of the aforementioned embodiment and are not elaborated here.

[0083] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A balloon guide catheter, characterized in that: include: The outer tube comprises an outer tube body, a sleeve arranged outside at least part of the outer tube body, and a cavity formed between the outer tube body and the sleeve; the outer tube body is at least partially provided with a through hole connecting the inner side of the outer tube body and the cavity, so that the sleeve can be attached to the outer side wall of the outer tube body under negative pressure.

2. The balloon guide catheter according to claim 1, characterized in that: The outer tube body is a hypotube and has a cutting pattern, and the through hole is a part of the cutting pattern.

3. The balloon guide catheter according to claim 2, characterized in that: The outer tube body is formed with a plurality of circumferential rods and connecting members connecting adjacent circumferential rods, wherein the plurality of circumferential rods are arranged along the axial direction of the outer tube body; the plurality of connecting members are arranged along the circumferential direction of the outer tube body, and the through hole is formed between two adjacent circumferential rods and two adjacent connecting members.

4. The balloon guide catheter according to claim 3, characterized in that: Several of the connecting parts are arranged along the circumferential direction of the outer tube body to form a connecting assembly, and several of the connecting assemblies are arranged along the axial direction of the outer tube body; the connecting parts of one connecting assembly and the connecting parts in the adjacent connecting assembly are staggered in the axial direction of the outer tube body.

5. The balloon guide catheter according to claim 4, characterized in that: The circumferential rod has a plurality of first protrusions protruding toward the proximal end of the outer tube body and a plurality of second protrusions protruding toward the distal end of the outer tube body; A plurality of first protrusions are arranged along the circumferential direction of the circumferential rod, a plurality of second protrusions are arranged along the circumferential direction of the circumferential rod, and the first protrusions and the second protrusions are arranged at intervals; a first recess opening toward the proximal end of the outer tube body is formed between two adjacent first protrusions, and a second recess opening toward the distal end of the outer tube body is formed between two adjacent second protrusions; Two ends of the connecting rod are respectively connected and fixed to a first protrusion of a circumferential rod and a second protrusion of an adjacent circumferential rod.

6. The balloon guide catheter according to claim 1, characterized in that: The two ends of the sleeve are respectively fixed on the outer tube body along the axial direction of the outer tube body; The outer tube body is a hypotube; the sleeve is made of a thermoplastic polymer material, and both ends of the sleeve are respectively heat-shrink molded on the outer tube body.

7. The balloon guide catheter according to claim 1, characterized in that: The sleeve comprises a sleeve body and a pair of tube pins arranged on the sleeve body, wherein the pair of tube pins are arranged opposite to each other along the axial direction of the sleeve body and fixed on the outer tube body; the cavity is formed between the sleeve body and the outer tube body.

8. The balloon guide catheter according to claim 1, characterized in that: The balloon guide catheter also has an inner tube arranged in the outer tube body and a balloon arranged at the distal end of the inner tube, the inner tube having a first channel; a second channel is formed between a portion of the outer side wall of the inner tube and a portion of the inner side wall of the outer tube body; the second channel is connected to the cavity through the through hole, and the balloon has a balloon cavity connected to the second channel; when the second channel is in a negative pressure state, the sleeve is attached to the outer side wall of the outer tube body.

9. The balloon guide catheter according to claim 8, characterized in that: The hardness of the inner tube gradually increases from the distal end to the proximal end; The inner tube comprises an inner liner tube, an inner liner sleeve arranged outside the inner liner tube, and a reinforcement layer arranged between the inner liner tube and the inner liner sleeve; the reinforcement layer is a metal coil; The hardness of the liner sleeve gradually increases from the distal end to the proximal end.

10. A balloon guide catheter, characterized in that: include: The outer tube has an outer tube body and a sleeve located outside the outer tube body; the outer tube body is a metal piece and has a plurality of circumferential rods and connecting pieces connecting adjacent circumferential rods, and the plurality of circumferential rods are arranged along the axial direction of the outer tube body.

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