Balloon catheter

Abstract

The utility model provides a balloon catheter. The balloon catheter comprises a balloon and a catheter body penetrating through the balloon, a cavity is formed in the balloon, the catheter body is sequentially provided with a catheter base, a first catheter section, a second catheter section and a third catheter section in the axial direction, the second catheter section is located in the cavity, a pressurizing opening is formed in the catheter base, a first perfusion opening is formed in the first catheter section, and a pressurizing through hole is formed in the second catheter section. The third pipe section is provided with a second filling opening and a second wire guide opening, the pipe body is provided with a pressurizing channel, a filling channel and a wire guide channel, the pressurizing channel is formed between the pressurizing opening and the pressurizing through hole, the filling channel is formed between the second filling opening and the first filling opening, and the wire guide channel is formed between the second filling opening and the second wire guide opening. The guide wire channel extends from the second guide wire opening to the near end of the catheter body in the catheter body, and the guide wire channel is used for being arranged on a guide wire in a sleeving mode so that the balloon catheter can move along a preset extending path or a preset withdrawing path under the guidance of the guide wire. And the condition of injury caused by blood flow retardation in the blood vessel is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly to a balloon catheter. Background Art

[0002] Balloon catheter intervention surgery is increasingly accepted by doctors and patients due to its advantages such as small trauma, good curative effect and few side effects. At present, balloon catheter intervention surgery is an effective way to treat vascular stenosis. During the treatment process, the balloon catheter is delivered to the vascular stenosis lesion, and the balloon is expanded by injecting liquid into the balloon to pressurize it, thereby achieving the effect of expanding the vascular stenosis lesion.

[0003] However, during the diagnosis and treatment process of the existing balloon catheter, the balloon inflated due to pressurization and expansion will block the blood flow in the blood vessel, which may cause damage due to ischemia in the blood vessel for too long or the catheter treatment time is too short to achieve the ideal treatment effect. Content of the Utility Model

[0004] In order to at least partially solve the problems existing in the prior art, the utility model provides a balloon catheter. The balloon catheter includes a balloon and a tube body passing through the balloon. A chamber is formed inside the balloon. The tube body successively has a catheter seat, a first tube section, a second tube section and a third tube section in the axial direction. The second tube section is located inside the chamber. A pressurization port is arranged on the catheter seat, a first perfusion port is arranged on the first tube section, a pressurization through hole is arranged on the second tube section, and a second perfusion port and a second guide wire port are arranged on the third tube section. Among them, a pressurization channel, a perfusion channel and a guide wire channel are arranged on the tube body. The pressurization channel is formed between the pressurization port and the pressurization through hole, the perfusion channel is formed between the second perfusion port and the first perfusion port, and the guide wire channel extends from the second guide wire port towards the proximal end of the tube body inside the tube body. The guide wire channel is used for sleeving a guide wire so that the balloon catheter moves along a preset extending path or a preset retracting path under the guidance of the guide wire.

[0005] For the balloon catheter provided by the utility model, a guide wire channel is arranged on the tube body, and the guide wire can pass through the guide wire channel, so that the balloon catheter can reach the lesion position along the guide wire, which is easier to operate; any suitable liquid can be injected into the pressurization channel through the pressurization port, and the liquid enters the balloon through the pressurization through hole, so that the balloon expands and participates in the treatment; a perfusion channel is also arranged on the tube body. After the balloon expands and blocks the blood vessel, the blood flow in the blood vessel can still flow through the perfusion channel. When such a balloon catheter is used, the situation of damage due to blood flow blockage in the blood vessel is avoided, and because the blood flow in the blood vessel is unobstructed, the balloon catheter can participate in the treatment for a longer time. The balloon catheter provided with a pressurization channel, a perfusion channel and a guide wire channel has stronger functional compatibility and expandability, can meet different treatment requirements, and has a better treatment effect.

[0006] Exemplarily, a first guide wire port is further provided on the catheter seat, and the guide wire channel is formed between the first guide wire port and the second guide wire port.

[0007] Exemplarily, the tube body includes a multi-lumen tube, and multiple lumens of the multi-lumen tube respectively form one of a pressurization channel, an infusion channel, and a guide wire channel.

[0008] Exemplarily, the tube body includes a multi-lumen tube. One lumen of the multi-lumen tube forms a pressurization channel, and at least one of the other lumens forms an infusion channel. A single-lumen tube is disposed in the pressurization channel, and a guide wire channel is formed by enclosing the tube wall of the single-lumen tube.

[0009] Exemplarily, a single-lumen tube is disposed in the tube body, and a pressurization channel is formed by enclosing the tube wall of the single-lumen tube. A first inner single-lumen tube and a second inner single-lumen tube are disposed in the pressurization channel. A guide wire channel is formed by enclosing the tube wall of the first inner single-lumen tube, and an infusion channel is formed by enclosing the tube wall of the second inner single-lumen tube.

[0010] Exemplarily, a combined through hole is provided on the first pipe section. The combined through hole forms a first guide wire port and a first infusion port, and the guide wire channel is formed between the first guide wire port and the second guide wire port.

[0011] Exemplarily, a composite channel is formed in the tube body and extends from the combined through hole toward the distal end of the tube body. The composite channel is formed by a multi-lumen tube. One lumen of the multi-lumen tube forms a guide wire channel, and at least one of the other lumens forms an infusion channel.

[0012] Exemplarily, multiple lumens of the multi-lumen tube form multiple infusion channels, and the multiple infusion channels surround the guide wire channel.

[0013] Exemplarily, a first guide wire port is further provided on the third pipe section, and the guide wire channel is formed between the first guide wire port and the second guide wire port.

[0014] Exemplarily, the second infusion port is disposed on the distal end face of the third pipe section.

[0015] Exemplarily, the second infusion port is disposed on the side surface of the third pipe section.

[0016] Exemplarily, a groove is formed by inwardly recessing the side surface of the third pipe section and communicating with the distal end face of the third pipe section, and the second infusion port is disposed in the groove.

[0017] A series of simplified concepts are introduced in the utility model content, which will be further described in detail in the specific implementation section. The utility model content section does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0018] The advantages and features of the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0019] The following drawings of the present utility model are hereby incorporated as part of the present utility model for understanding the present utility model. The embodiments and descriptions of the present utility model are shown in the drawings to explain the principles of the present utility model. In the drawings,

[0020] Figure 1 is a schematic diagram of a balloon catheter according to an exemplary embodiment of the present utility model;

[0021] Figure 2 is Figure 1 a perspective view of the balloon catheter shown;

[0022] Figure 3 is Figure 2 a partially enlarged view of the balloon catheter shown;

[0023] Figure 4A is Figure 3 a front view of a part of the balloon catheter shown;

[0024] Figure 4B is Figure 3 a rear view of a part of the balloon catheter shown;

[0025] Figure 5A is a cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0026] Figure 5B is a cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0027] Figure 5C is a cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0028] Figure 5D is a cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0029] Figure 5E is a cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0030] Figure 5F is a cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0031] Figure 6 is a schematic diagram of a balloon catheter according to an exemplary embodiment of the present utility model;

[0032] Figure 7 is Figure 6 a perspective view of the balloon catheter shown;

[0033] Figure 8A A cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0034] Figure 8B A cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0035] Figure 8C A cross-sectional view of a tube body according to an exemplary embodiment of the present utility model;

[0036] Figure 9 A schematic diagram of a balloon catheter according to an exemplary embodiment of the present utility model;

[0037] Figure 10 is Figure 9 A perspective view of the balloon catheter shown;

[0038] Figure 11A A partially enlarged view of a balloon catheter according to an exemplary embodiment of the present utility model;

[0039] Figure 11B A partially enlarged view of a balloon catheter according to an exemplary embodiment of the present utility model; and

[0040] Figure 11C A partially enlarged view of a balloon catheter according to an exemplary embodiment of the present utility model.

[0041] Wherein, the above-mentioned drawings include the following reference numerals:

[0042] 100, balloon; 110, chamber; 200, tube body; 201, pressurization channel; 202, perfusion channel; 203, guide wire channel; 204, composite channel; 205, main body part; 210, catheter hub; 211, pressurization port; 212, first guide wire port A; 220, first tube section; 221, first perfusion port; 222, first guide wire port B; 223, combined through hole; 230, second tube section; 231, pressurization through hole; 240, third tube section; 241, second perfusion port; 242, second guide wire port; 243, first guide wire port C; 244, groove; 250, proximal end; 260, distal end; 300, radiopaque ring. Detailed implementation manners

[0043] In the following description, a large number of details are provided to enable a thorough understanding of the present utility model. However, those skilled in the art can understand that the following description only exemplarily shows the preferred embodiments of the present utility model, and the present utility model can be implemented without one or more of such details. In addition, in order to avoid confusion with the present utility model, some well-known technical features in the art are not described in detail.

[0044] The present utility model provides a balloon catheter. Refer to Figure 1 and Figure 2 , the balloon catheter may include a balloon 100 and a tube body 200 passing through the balloon 100. A chamber 110 may be formed inside the balloon 100. A shock wave generating device may be arranged inside the chamber 110, so that the balloon catheter can realize functions such as shock wave lithotripsy. Cutting components, notched guide wires, etc. may be installed outside the balloon 100 to enhance the ability of the balloon 100 to open diseased tissues after expansion; drugs may be coated on the outside of the balloon 100 to enhance the treatment effect of the balloon catheter. For example, various drugs such as paclitaxel or rapamycin may be coated on the outside of the balloon 100; various medical devices such as stents may also be carried outside the balloon 100 to participate in the treatment.

[0045] The tube body 200 may successively have a catheter seat 210, a first tube section 220, a second tube section 230, and a third tube section 240 in the axial direction. When the balloon catheter is in use, the part of the tube body 200 entering the human body may be the third tube section 240, the second tube section 230, and a part of the first tube section 220. The second tube section 230 may be located inside the chamber 110. In order to accurately position the balloon 100, a visualization ring 300 may be arranged on the second tube section 230. The visualization ring 300 may play a role in marking and positioning the balloon 100, so that after the balloon catheter enters the human body, it is convenient for the operator to master the specific position of the balloon 100 in the human body. A pressurizing port 211 may be arranged on the catheter seat 210. The pressurizing port 211 may be in any form that is easy for liquid to pass through. For example, the pressurizing port 211 may be a circular opening of a short tube connected to the catheter seat 210. A first perfusion port 221 may be arranged on the first tube section 220. The first perfusion port 221 is located outside the balloon 100. Preferably, the first perfusion port 221 may be located on the first tube section 220 closer to the balloon 100. The first perfusion port 221 may be in any form that is easy for blood flow to pass through. For example, the first perfusion port 221 may be an opening arranged on the side surface of the first tube section 220. A pressurizing through hole 231 may be arranged on the second tube section 230. Since the second tube section 230 is located inside the chamber 110, the pressurizing through hole 231 is also located inside the chamber 110. The pressurizing through hole 231 may be in any form that is easy for liquid to pass through. For example, the pressurizing through hole 231 may be a circular opening. The pressurizing through hole 231 may be designed in any number according to needs. A second perfusion port 241 and a second guide wire port 242 may be arranged on the third tube section 240. The second perfusion port 241 is located outside the balloon 100. The second perfusion port 241 may be in any form that is easy for blood flow to pass through. The second guide wire port 242 is located outside the balloon 100. The second guide wire port 242 may be in any form that is easy for a guide wire to pass through. Among them, refer to Figure 3 、 Figure 4A and Figure 4B, a pressure - charging channel 201, a perfusion channel 202, and a guide - wire channel 203 can be provided on the tube body 200.

[0046] The pressure - charging channel 201 can be formed between the pressure - charging port 211 and the pressure - charging through - hole 231. The pressure - charging port 211 can be connected to an external liquid supply device, and the external liquid supply device can convey any suitable liquid to the pressure - charging channel 201 through the pressure - charging port 211. For example, the external liquid supply device can convey physiological saline of a certain concentration to the pressure - charging port 211. The liquid in the pressure - charging channel 201 can enter the chamber 110 through the pressure - charging through - hole 231, so that a large amount of liquid entering the chamber 110 can cause the balloon 100 to expand and inflate.

[0047] The perfusion channel 202 can be formed between the second perfusion port 241 and the first perfusion port 221. When the balloon catheter is in use, both the first perfusion port 221 and the second perfusion port 241 can be located inside the human body. The blood in the human body can enter the perfusion channel 202 through the first perfusion port 221 and flow out from the second perfusion port 241. It should be noted that the blood flow direction in the perfusion channel 202 when the balloon catheter is in use is not limited. That is to say, the blood can enter the perfusion channel 202 from the first perfusion port 221 and flow out from the second perfusion port 241; or the blood can enter the perfusion channel 202 from the second perfusion port 241 and flow out from the first perfusion port 221. The blood flow direction in the perfusion channel 202 is related to the actual situation when the balloon catheter is in use, not only related to whether the balloon catheter is in the pushing state or the retracting state, but also related to the original blood flow direction in the blood vessel. Thus, even if the balloon 100 expands and blocks the blood vessel, the blood in the blood vessel can still flow through the perfusion channel 202.

[0048] The guide - wire channel 203 can extend from the second guide - wire port 242 towards the proximal end 250 of the tube body 200 inside the tube body 200. The guide - wire channel 203 can be used to sleeved on a guide wire so that the balloon catheter can move along a preset extending path or a preset retracting path under the guidance of the guide wire. The preset extending path refers to the path along which the balloon catheter moves when it extends along the guide wire, and the preset retracting path refers to the path along which the balloon catheter moves when the balloon catheter is retrieved along the guide wire. It can be understood that a first guide - wire port can be provided on the balloon catheter, and the guide - wire channel 203 can be formed between the first guide - wire port and the second guide - wire port 242, so that the guide wire can pass through the guide - wire channel 203, and thus the guide wire can pass through at least a part of the balloon catheter, so that the balloon catheter can move under the guidance of the guide wire. Setting the first guide - wire port at different positions on the balloon catheter will result in different lengths of the guide - wire channel 203. The specific position of the first guide - wire port on the balloon catheter will be described in detail in the following with specific embodiments.

[0049] The pressure - charging channel 201, the perfusion channel 202, and the guide - wire channel 203 can respectively be in the form of separate pipes, that is, they can respectively be arranged in the pipe body 200 in the form of single - lumen pipes; or the pipe body 200 can be a multi - lumen pipe, and multiple lumen channels in the multi - lumen pipe - shaped pipe body 200 can respectively form one of the pressure - charging channel 201, the perfusion channel 202, and the guide - wire channel 203.

[0050] For the balloon catheter provided by the present utility model, a guide - wire channel 203 is arranged on the pipe body 200, and a guide wire can pass through the guide - wire channel 203, so that the balloon catheter can reach the lesion site along the guide wire, making it easier to operate; any suitable liquid can be injected into the pressure - charging channel 201 through the pressure - charging port 211, and the liquid enters the balloon 100 through the pressure - charging through - hole 231, thereby expanding the balloon 100 to participate in the treatment; a perfusion channel 202 is also arranged on the pipe body 200. After the expanded balloon 100 blocks the blood vessel, the blood flow in the blood vessel can still flow through the perfusion channel 202. When such a balloon catheter is in use, the situation of damage due to blood - flow blockage in the blood vessel is avoided, and because the blood flow in the blood vessel is unobstructed, the balloon catheter can participate in the treatment for a longer time. The balloon catheter provided with the pressure - charging channel 201, the perfusion channel 202, and the guide - wire channel 203 has stronger functional compatibility and expandability, can meet different treatment requirements, and has a better treatment effect.

[0051] In an embodiment of the present utility model, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4A and Figure 4B , a first guide - wire port can also be arranged on the catheter seat 210. For the convenience of distinguishing from other embodiments, the first guide - wire port in this embodiment is called the first guide - wire port A212, and the first guide - wire port A212 here is only for distinction and has no any limitation. The guide - wire channel 203 can be formed between the first guide - wire port A212 and the second guide - wire port 242. The first guide - wire port A212 is arranged on the catheter seat 210, which is equivalent to the guide - wire channel 203 penetrating through the pipe body 200. Such a balloon catheter can be considered as an overall - exchange type, that is, when the balloon catheter is in use, it advances and retreats along the guide wire as a whole for taking and using, so that it can have better stability during the process of the balloon catheter participating in the treatment.

[0052] Exemplarily, referring to Figure 5A 、 Figure 5B and Figure 5C, the tube body 200 may include a multi-lumen tube, and the multiple lumens of the multi-lumen tube may respectively form one of the pressurization channel 201, the perfusion channel 202, and the guide wire channel 203. The tube body 200 may include a main body portion 205, and the main body portion 205 may be a multi-lumen tube. The multiple lumens in the tube body 200 in the form of a multi-lumen tube may be integrally processed and formed during the production process of the main body portion 205. Since the tube body 200 in the form of a multi-lumen tube can be integrally processed and formed, such a tube body 200 has stronger reliability, and there is no need for other connection forms between such multiple lumens, which is equivalent to reducing the wall thickness between the respective lumens inside the tube body 200. Such a tube body 200 can thus have a smaller size, and the balloon catheter can be more flexible. When such a balloon catheter is applied to interventional therapy, the balloon catheter has better passability and better treatment effect.

[0053] Specifically, Figure 5A In the illustrated embodiment, the pressurization channel 201, the perfusion channel 202, and the guide wire channel 203 are symmetrically arranged inside the tube body 200, and such a tube body 200 is easier to produce and process. Figure 5B In the illustrated embodiment, there are multiple perfusion channels 202, which can avoid the phenomenon that the blood flow in the blood vessel is still blocked due to the insufficient flow area of the perfusion channel 202, and further ensure that the blood flow in the blood vessel can flow smoothly. Figure 5C In the illustrated embodiment, two perfusion channels 202 are provided on the tube body 200. The two perfusion channels 202, the pressurization channel 201, and the guide wire channel 203 are symmetrically arranged inside the tube body 200, and the maximum flow area of each of the four channels is reached. Such a tube body 200 has a higher space utilization rate inside.

[0054] Exemplarily, refer to Figure 5D and Figure 5E, the tube body 200 may include a multi-lumen tube. One of the multiple lumens of the multi-lumen tube may form a pressurization channel 201, and at least one of the other lumens may form an infusion channel 202. Since the pressurization channel 201 only participates in the flow of liquid when the balloon 100 is expanded, while the infusion channel 202 always participates in dredging the blood flow in the blood vessel during the treatment process of the balloon catheter, therefore, only one pressurization channel 201 may be provided on the tube body 200, and multiple infusion channels 202 may be provided. For the overall exchange type balloon catheter, the pressurization port 211 and the first guide wire port A212 are both provided on the catheter hub 210. The pressurization channel 201 and the guide wire channel 203 both penetrate through the tube body 200. Therefore, a single-lumen tube may be provided in the pressurization channel 201, and the tube wall of the single-lumen tube may enclose to form the guide wire channel 203. Since the single-lumen tube whose tube wall encloses to form the guide wire channel 203 is separately produced and processed independent of the main body part 205 provided with the pressurization channel 201 and the infusion channel 202, such an overall tube body 200 has lower requirements for the selection of the tube material, and the overall balloon catheter is easier to produce and process. Specifically, Figure 5D In the illustrated embodiment, the pressurization channel 201, the infusion channel 202, and the guide wire channel 203 all have a circular cross-section. Among them, the main body part 205 is a double-lumen tube. Such a main body part 205 has lower requirements for the tube material, and such a tube body 200 is easier to produce and process; Figure 5E In the illustrated embodiment, the main body part 205 may be a multi-lumen tube, the pressurization channel 201 has a semi-circular cross-section, and there are multiple infusion channels 202. Such a tube body 200 has a higher internal space utilization rate, and the setting of multiple infusion channels 202 can further ensure that the blood flow in the blood vessel can flow smoothly through the infusion channel 202.

[0055] Exemplarily, referring to Figure 5F , a single-lumen tube may be provided in the tube body 200. The tube wall of the single-lumen tube may enclose to form the pressurization channel 201. A first inner single-lumen tube and a second inner single-lumen tube may be provided in the pressurization channel 201. The tube wall of the first inner single-lumen tube may enclose to form the guide wire channel 203, and the tube wall of the second inner single-lumen tube may enclose to form the infusion channel 202. The main body part 205 of the tube body 200 may be in the form of a single-lumen tube. The first inner single-lumen tube and the second inner single-lumen tube here are only for distinction without any limitation. In such a balloon catheter, the tube body 200 has lower requirements for the tube material, and the production and processing are also very simple.

[0056] In an embodiment of the present invention, referring to Figure 6 and Figure 7, a combined through hole 223 may be provided on the first tube section 220, and the combined through hole 223 may form a first guide wire port and a first perfusion port 221. For the convenience of distinguishing from other embodiments, the first guide wire port in this embodiment is referred to as the first guide wire port B222, and the first guide wire port B222 here is only used as a distinction without any limitation. The guide wire channel 203 may be formed between the first guide wire port B222 and the second guide wire port 242. When the balloon catheter is in use, the first perfusion port 221 is located inside the human body, that is, the combined through hole 223 is located inside the human body. The first guide wire port B222 is formed at the combined through hole 223, and such a guide wire channel 203 only passes through part of the tube body 200, and such a balloon catheter can be considered as a long guide wire quick exchange type. The portion of the guidewire outside the human body will be outside the balloon catheter. During the treatment process in which the balloon catheter is involved, the portion of the tube body 200 outside the human body is independent of the guidewire, and the operator can operate the guidewire, for example, the guidewire position can be fine-tuned when the guidewire position deviates. For such a long guidewire rapid exchange type balloon catheter, the guidewire does not penetrate the tube body 200, and the pushing performance of the balloon catheter along the guidewire may be poor, so a hypotube can be provided on the tube body 200 to enhance the overall pushing performance. For example, a hypotube can be provided on the tube body 200 between the catheter seat 210 and the first tube section 220. Such a balloon catheter is more effective when involved in treatment.

[0057] See also Figure 8A , Figure 8B and Figure 8C A composite channel 204 may be formed in the tube body 200 extending from the combined through hole 223 toward the distal end 260 of the tube body 200. The composite channel 204 may be formed by a multi-lumen tube, and one of the multiple lumens of the multi-lumen tube may form a guidewire channel 203, and at least one of the other lumens may form a perfusion channel 202. Since the guidewire channel 203 only guides the extension or withdrawal of the balloon catheter, when the balloon catheter is in use, usually one guidewire is sufficient to guide the balloon catheter, and the perfusion channel 202 will always participate in the dredging of blood flow in the blood vessel during the treatment of the balloon catheter, therefore, the composite channel 204 may be provided with only one guidewire channel 203, and the perfusion channel 202 may be provided with multiple. Such a composite channel 204 may be formed in an integrated manner, and the overall stability of the balloon catheter is better.

[0058] See Figure 8A The multiple lumens of the multi-lumen tube may form multiple perfusion channels 202, and the multiple perfusion channels 202 may surround the guidewire channel 203. Such multiple perfusion channels 202 have a better effect on clearing blood flow in the blood vessel. Figure 8BIn the illustrated embodiment, the perfusion channel 202 and the guidewire channel 203 are both channels with circular cross-sections. Such a tube body 200 has a simpler structure and is easier to produce and process. Figure 8C In the illustrated embodiment, the perfusion channel 202 and the guidewire channel 203 are both channels with semicircular cross-sections, which improves the space utilization inside the tube body 200.

[0059] In one embodiment of the present invention, see Figure 9 and Figure 10 , the third pipe section 240 may also be provided with a first guide wire port. For the convenience of distinguishing from other embodiments, the first guide wire port in this embodiment is referred to as the first guide wire port C243, and the first guide wire port C243 here is only used as a distinction without any limitation. The guide wire channel 203 may be formed between the first guide wire port C243 and the second guide wire port 242. The third pipe section 240 usually has only a short length, and such a guide wire channel 203 is also short in length, and such a balloon catheter can be considered as a short guide wire fast exchange type. Although such a guide wire channel 203 is short in length, the guide wire can still guide the balloon catheter when passing through the guide wire channel 203. For such a short guide wire fast exchange type balloon catheter, the guide wire does not penetrate the tube body 200, and the pushability of the balloon catheter along the guide wire may be poor, so a hypotube may be provided on the tube body 200 to enhance the overall pushability. For example, a hypotube may be provided on the tube body 200 between the catheter seat 210 and the first pipe section 220. Since the first guidewire port C243 and the second guidewire port 242 are both located at the distal end of the balloon 100, when the balloon 100 expands, the guidewire will be squeezed by the balloon 100 and pressed against the lesion location on the blood vessel wall. Such a balloon catheter can enhance the ability of the balloon 100 to open the lesion with the help of the guidewire.

[0060] In the balloon catheter provided by the present invention, the second infusion port 241 can be located at any position on the third tube segment 240, and the second infusion port 241 can be in any form that is easy for blood to flow through. Figure 11A The second perfusion port 241 can be arranged on the distal end surface of the third tube segment 240. The structure near the second perfusion port 241 is simpler, and the blood can flow out of the perfusion channel 202 in a straight line, so that the blood flow in the blood vessel is smoother, and such a tube body 200 is easy to produce and process.

[0061] For example, see Figure 11B The second perfusion port 241 can be arranged on the side of the third pipe segment 240. There is a gap between the second perfusion port 241 and the second guide wire port 242, which can prevent the guide wire passing through the second guide wire port 242 from interfering with the blood flow out of the second perfusion port 241, and can also prevent the blood flow out of the second perfusion port 241 from interfering with the guide wire and changing the guide wire position.

[0062] Exemplarily, refer to Figure 11C , a side surface of the third pipe section 240 may be recessed inward to form a groove 244 communicating with a distal end face of the third pipe section 240, and the second perfusion port 241 may be disposed in the groove 244. The groove 244 may guide the blood flow flowing out of the second perfusion port 241, reduce the turbulence of the blood flow when flowing out of the second perfusion port 241, so that the blood flow passing through the perfusion channel 202 can flow more smoothly in the blood vessel.

[0063] In the description of the present invention, it should be understood that the directional terms such as "front", "rear", "upper", "lower", "left", "right", "lateral", "vertical", "perpendicular", "horizontal" and "top", "bottom", etc. The indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these directional terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention; the directional terms "inner" and "outer" refer to the inside and outside relative to the contour of each component itself.

[0064] For the convenience of description, regional relative terms such as "above...", "above...", "on the upper surface of...", "above" etc. can be used here to describe the regional positional relationship between one or more components or features shown in the drawings and other components or features. It should be understood that the regional relative terms not only include the orientation of the components described in the drawings, but also different orientations during use or operation. For example, if the components in the drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Thus, the exemplary term "above..." can include both "above..." and "below...". In addition, these components or features can also be positioned at other different angles (such as rotating 90 degrees or other angles), and this article intends to include all these situations.

[0065] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, components, components and / or combinations thereof.

[0066] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present utility model are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here.

[0067] The present utility model has been described through the above-mentioned embodiments. However, it should be understood that the above-mentioned embodiments are only for the purpose of illustration and example, and are not intended to limit the present utility model to the scope of the described embodiments. In addition, those skilled in the art can understand that the present utility model is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present utility model, and these variations and modifications all fall within the scope of protection required by the present utility model. The scope of protection of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. A balloon catheter, comprising a balloon and a tube body penetrating the balloon, wherein a chamber is formed inside the balloon, characterized in that: The tube body has a catheter seat, a first tube section, a second tube section and a third tube section in the axial direction, the second tube section is located in the chamber, a pressure charging port is provided on the catheter seat, a first perfusion port is provided on the first tube section, a pressure charging through hole is provided on the second tube section, and a second perfusion port and a second guide wire port are provided on the third tube section. Among them, the tube body is provided with a charging channel, an injection channel and a guidewire channel, the charging channel is formed between the charging port and the charging through hole, the injection channel is formed between the second injection port and the first injection port, the guidewire channel extends from the second guidewire port toward the proximal end of the tube body in the tube body, and the guidewire channel is used to be sleeved on the guidewire so that the balloon catheter moves along a preset extension path or a preset withdrawal path under the guidance of the guidewire.

2. The balloon catheter according to claim 1, characterized in that: The catheter seat is also provided with a first guide wire port, and the guide wire channel is formed between the first guide wire port and the second guide wire port.

3. The balloon catheter according to claim 2, characterized in that: The tube body comprises a multi-lumen tube, and a plurality of lumens of the multi-lumen tube respectively form one of the pressure charging channels, at least one of the perfusion channels and one of the guide wire channels.

4. The balloon catheter according to claim 2, characterized in that: The tube body comprises a multi-lumen tube, one of the multiple lumens of the multi-lumen tube forms the pressure charging channel, and at least one of the other lumens forms the perfusion channel. A single-lumen tube is arranged in the pressure charging channel, and the tube wall of the single-lumen tube encloses the guidewire channel.

5. The balloon catheter according to claim 2, characterized in that: A single-lumen tube is arranged in the tube body, and the tube wall of the single-lumen tube encloses the charging channel. A first inner single-lumen tube and a second inner single-lumen tube are arranged in the charging channel, and the tube wall of the first inner single-lumen tube encloses the guide wire channel, and the tube wall of the second inner single-lumen tube encloses the perfusion channel.

6. The balloon catheter according to claim 1, characterized in that: The first pipe section is provided with a combined through hole, the combined through hole forms a first guide wire port and the first perfusion port, and the guide wire channel is formed between the first guide wire port and the second guide wire port.

7. The balloon catheter according to claim 6, characterized in that: A composite channel is formed in the tube body extending from the combined through hole toward the distal end of the tube body, and the composite channel is formed by a multi-lumen tube, one of the multiple lumens of the multi-lumen tube forms the guide wire channel, and at least one of the other lumens forms the perfusion channel.

8. The balloon catheter according to claim 7, characterized in that: The multiple lumens of the multi-lumen tube form multiple perfusion channels, and the multiple perfusion channels surround the guide wire channel.

9. The balloon catheter according to claim 1, characterized in that: The third pipe section is also provided with a first wire guide opening, and the wire guide channel is formed between the first wire guide opening and the second wire guide opening.

10. The balloon catheter according to claim 1, characterized in that: The second filling port is arranged on the distal end surface of the third pipe segment; Alternatively, the second filling port is arranged on the side of the third pipe segment; Alternatively, the side surface of the third pipe segment is recessed inwardly to form a groove connected to the distal end surface of the third pipe segment, and the second filling port is arranged in the groove.

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