Balloon catheter

Abstract

The utility model relates to a balloon catheter which comprises a catheter body and a balloon, the catheter body comprises an outer catheter and an inner catheter, the inner catheter is arranged in the outer catheter in a penetrating mode, the far end of the inner catheter extends out of the far end of the outer catheter, the near end of the balloon is connected with the far end of the outer catheter, and the balloon is arranged in the outer catheter. The far end of the balloon is connected with the far end of the inner catheter, the inner catheter comprises a first catheter section and a second catheter section, one end of the first catheter section is inserted into one end of the second catheter section, and when the balloon is filled and pressed, the first catheter section can slide relative to the second catheter section. Through the insertion type structure of the tube section, when the balloon is pressurized to a certain degree, the inner catheter can be stretched to the length equal to that of the balloon, the balloon is prevented from being bent, control over the balloon and implementation of treatment are facilitated, the overall structure is simple, and the stretching effect is good.

Description

Technical Field

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

[0002] At present, balloon catheters have become the main treatment device for treating cardiovascular stenosis. The stenosis site is expanded by expanding the balloon, or further released in conjunction with electrodes to release shock waves, thereby opening the stenosis site.

[0003] The structural design of existing conventional balloon catheters is basically the same, mainly including a catheter body and a balloon. The catheter body includes an outer catheter and an inner catheter. The inner catheter is inserted into the outer catheter, and the distal end of the inner catheter extends out of the distal end of the outer catheter. The proximal end of the balloon is connected to the distal end of the outer catheter, and the distal end of the balloon is connected to the distal end of the inner catheter. The tube used for the catheter body is basically a conventional extruded polymer material tube, but some materials have poor ductility. When the balloon is pressurized to a certain extent, due to the difference in the stretching length of the outer and inner catheters and the balloon body, in most cases the balloon body has a long stretching length, while the inner catheter cannot be stretched to an equal length, resulting in the balloon body presenting a bent state, similar to a "banana shape", which is not conducive to control and treatment of the lesion location. Summary of the invention

[0004] The utility model aims to provide a balloon catheter, such as a balloon catheter for treating vascular lesions.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A balloon catheter comprises a catheter body and a balloon, wherein the catheter body comprises an outer catheter and an inner catheter, wherein the inner catheter is inserted into the outer catheter, and the distal end of the inner catheter extends out of the distal end of the outer catheter, the proximal end of the balloon is connected to the distal end of the outer catheter, and the distal end of the balloon is connected to the distal end of the inner catheter, and the inner catheter comprises a first tube segment and a second tube segment, wherein one end of the first tube segment is inserted into one end of the second tube segment, and when the balloon is filled and pressurized, the first tube segment can slide relative to the second tube segment.

[0007] Preferably, in the above technical solution, one end of the first tube segment has a flared portion, the caliber of the flared portion is larger than the outer diameter of the first tube segment, one end of the second tube segment has a necked portion, the caliber of the necked portion is smaller than the inner diameter of the second tube segment, and the caliber of the flared portion is larger than the caliber of the necked portion, the flared portion is located inside one end of the second tube segment, and the necked portion has an interference fit with the first tube segment. The cooperation between the flared portion and the necked portion prevents the first tube segment and the second tube segment from detaching from each other on the one hand, and also achieves a certain degree of sealing on the other hand, thereby preventing the medium in the balloon from entering the tube segment.

[0008] Preferably, in the above technical solution, a sealing ring is sleeved on the first pipe section inserted into one end of the second pipe section, so that the sealing performance is further improved by the sealing ring.

[0009] Further preferably, at least one sealing ring is provided. The more sealing rings are provided, the better the sealing effect. However, there is no need to provide too many sealing rings. Usually, no more than five are provided, such as one, two, three, etc.

[0010] Further preferably, the material of the sealing ring is selected from rubber or silicone.

[0011] Preferably, the above technical solution is that the proximal end of the first tube segment is inserted into the distal end of the second tube segment, and the proximal end of the first tube segment and the distal end of the second tube segment are located inside the balloon, the distal end of the balloon is connected to the distal end of the first tube segment, and the insertion ends of the first tube segment and the second tube segment are located inside the balloon to respond to sliding as quickly as possible and avoid bending of the balloon.

[0012] Preferably, the above technical solution is such that the inner catheter also includes a third tube segment, the proximal end of the first tube segment is inserted into the distal end of the second tube segment, the proximal end of the third tube segment is inserted into the distal end of the first tube segment, and when the balloon is inflated and pressurized, the first tube segment can slide relative to the third tube segment.

[0013] Preferably, the above technical solution is characterized in that the inner catheter also includes a third tube segment, the proximal end of the first tube segment is inserted into the distal end of the second tube segment, the distal end of the first tube segment is inserted into the proximal end of the third tube segment, and when the balloon is inflated and pressurized, the first tube segment can slide relative to the third tube segment.

[0014] Further preferably, both ends of the first tube segment, the distal end of the second tube segment, and the proximal end of the third tube segment are located inside the balloon, the distal end of the balloon is connected to the distal end of the third tube segment, and the insertion ends of the first tube segment, the second tube segment, and the third tube segment are located inside the balloon to respond to sliding as quickly as possible and avoid bending of the balloon.

[0015] Preferably, in the above technical solution, the ductility of the inner catheter is lower than that of the balloon, and the difference in ductility between the inner catheter and the balloon enables the first tube segment and the second tube segment to slide relative to each other when the balloon is pressurized, thereby avoiding bending of the balloon.

[0016] Preferably, in the above technical solution, the material of the inner catheter is selected from any one of nylon, Pebax and PTFE.

[0017] Preferably, in the above technical solution, the material of the balloon is selected from any one of nylon, Pebax and TPU.

[0018] Preferably, in the above technical solution, the balloon catheter also includes an electrode group, and the electrode group is arranged on the first tube segment and / or the second tube segment. By arranging the electrode group, the release of shock waves can be achieved in cooperation with the conductive liquid in the balloon, thereby shattering the calcified lesions and opening the narrow area.

[0019] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0020] The utility model uses the insertable structure of the tube section so that when the balloon is pressurized to a certain extent, the inner catheter can be stretched to a length equal to the balloon, avoiding bending of the balloon, thereby facilitating the control of the balloon and the implementation of treatment. The overall structure is simple and the stretching effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a schematic structural diagram of the balloon catheter of Example 1;

[0022] Attached Figure 2 It is a schematic structural diagram of a balloon catheter according to Embodiment 2;

[0023] Attached Figure 3 It is a schematic structural diagram of the balloon catheter of Example 3;

[0024] Attached Figure 4 Schematic diagram of the insertion and matching of the first pipe section and the second pipe section in this embodiment Figure 1 ;

[0025] Attached Figure 5 Schematic diagram of the insertion and matching of the first pipe section and the second pipe section in this embodiment Figure 2.

[0026] In the above attached figure:

[0027] 10, outer conduit; 11, inner conduit; 110, first pipe section; 1100, expansion portion; 111, second pipe section; 1110, contraction portion; 112, third pipe section;

[0028] 2. Balloon;

[0029] 3. Electrode group;

[0030] 4. Sealing ring. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] The proximal end mentioned in this application refers to the end close to the operator, and the distal end mentioned in this application refers to the end away from the operator; when the catheter body is equipped with an operating handle, the proximal end also refers to the end close to the operating handle, and the distal end also refers to the end away from the operating handle.

[0034] like Figure 1-3 The balloon catheter shown comprises a catheter body and a balloon 2. Among them:

[0035] The catheter body includes an outer catheter 10 and an inner catheter 11. The inner catheter 11 is inserted into the outer catheter 10, and the distal end of the inner catheter 11 extends out of the distal end of the outer catheter 10. The proximal end of the balloon 2 is connected to the distal end of the outer catheter 10, and the distal end of the balloon 2 is connected to the distal end of the inner catheter 11.

[0036] In this embodiment: the inner catheter 11 includes a first tube segment 110 and a second tube segment 111. One end of the first tube segment 110 is inserted into one end of the second tube segment 111. When the balloon 2 is filled and pressurized, or when the balloon 2 is filled and pressurized to a certain extent, the first tube segment 110 can slide relative to the second tube segment 111. There is at least one insertion structure of the first tube segment 110 and the second tube segment 111, and two, three or more structures can be provided. The insertion ends of the first tube segment 110 and the second tube segment 111 are located inside the balloon 2, and can perform the fastest sliding response to avoid the bending of the balloon.

[0037] In one implementation of the present embodiment: one end of the first pipe segment 110 has a flared portion 1100, the caliber of the flared portion 1100 is larger than the outer diameter of the first pipe segment 110, preferably, the caliber of the flared portion 1100 gradually increases; one end of the second pipe segment 111 has a constricted portion 1110, the caliber of the constricted portion 1110 is smaller than the inner diameter of the second pipe segment 111, preferably, the caliber of the constricted portion 1110 gradually decreases, the caliber of the flared portion 1100 is larger than the caliber of the constricted portion 1110, the flared portion 1100 of the first pipe segment 110 is located inside one end of the second pipe segment 111, and the constricted portion 1110 and the first pipe segment 110 are interference fit, such as Figure 4 In this way, the flared portion 1100 of the first tube segment 110 can prevent the first tube segment 110 from slipping out of one end of the second tube segment 111, and the interference fit between the narrowed portion 1110 and the first tube segment 110 prevents the first tube segment 110 and the second tube segment 111 from expanding or contracting during normal operation, and also achieves a certain degree of sealing to prevent the medium in the balloon 2 from entering the second tube segment 111.

[0038] In another implementation of this embodiment: a sealing ring 4 is sleeved on the first pipe section 110 inserted into one end of the second pipe section 111, and the sealing ring 4 further improves the sealing performance. Figure 5 As shown. At least one sealing ring 4 is provided. The more sealing rings 4 are provided, the better the sealing effect. However, there is no need to provide too many sealing rings 4 to cause waste. Usually, no more than five sealing rings are provided, such as one, two, three, etc. Three sealing rings are used as an example in the figure. The material of the sealing ring 4 is selected from rubber or silicone, and a certain lubricant may also be added.

[0039] The inner catheter 11 of the balloon catheter needs to have a certain degree of support. Therefore, the inner catheter 11 is made of a material with a certain degree of support, such as a catheter extruded from nylon, Pebax, PTFE and other materials; the balloon 2 is generally made of materials such as nylon, Pebax, TPU and the like. When selecting the materials of the inner catheter 11 and the balloon 2, the ductility of the inner catheter 11 is lower than the ductility of the balloon 2. Through the difference in ductility between the inner catheter 11 and the balloon 2, the first tube segment 110 and the second tube segment 111 can slide relative to each other when the balloon 2 is filled and pressurized to a certain degree, thereby avoiding bending of the balloon.

[0040] In addition, the balloon catheter also includes an electrode group 3, which is arranged on the first tube segment 110 and / or the second tube segment 111. The electrode group is not the invention point of the present application and will not be described in detail here. The electrode group 3 can be arranged to cooperate with the conductive liquid in the balloon 2 to release shock waves, thereby shattering the calcified lesion and opening the narrow area.

[0041] The inner catheter 11 of this embodiment is formed by inserting and splicing a first tube segment 110 and a second tube segment 111. The first tube segment 110 and the second tube segment 111 can slide relative to each other. When the balloon 2 is pressurized to a certain pressure, due to the stretching effect, the first tube segment 110 is pulled out of the second tube segment 111 by a certain length, thereby achieving the effect of extending the inner catheter 11 by a certain length, avoiding the occurrence of the "banana bend" phenomenon.

[0042] Embodiment 1:

[0043] like Figure 1 The balloon catheter shown comprises a catheter body and a balloon 2. Among them:

[0044] The catheter body includes an outer catheter 10 and an inner catheter 11. The inner catheter 11 is inserted into the outer catheter 10, and the distal end of the inner catheter 11 extends out of the distal end of the outer catheter 10. The proximal end of the balloon 2 is connected to the distal end of the outer catheter 10, and the distal end of the balloon 2 is connected to the distal end of the inner catheter 11.

[0045] In this embodiment: the inner catheter 11 is composed of a first tube segment 110 and a second tube segment 111, that is, the inner catheter 11 is a two-section structure, and the diameter of the first tube segment 110 is smaller than the diameter of the second tube segment 111, so that the proximal end of the first tube segment 110 is inserted into the distal end of the second tube segment 111, and the proximal end of the first tube segment 110 and the distal end of the second tube segment 111 are located inside the balloon 2, and the distal end of the balloon 2 is connected to the distal end of the first tube segment 111.

[0046] In addition, the electrode group 3 shown in the figure is arranged on the first pipe section 110 .

[0047] Embodiment 2:

[0048] like Figure 2The balloon catheter shown comprises a catheter body and a balloon 2. Among them:

[0049] The catheter body includes an outer catheter 10 and an inner catheter 11. The inner catheter 11 is inserted into the outer catheter 10, and the distal end of the inner catheter 11 extends out of the distal end of the outer catheter 10. The proximal end of the balloon 2 is connected to the distal end of the outer catheter 10, and the distal end of the balloon 2 is connected to the distal end of the inner catheter 11.

[0050] In this embodiment: the inner catheter 11 is composed of a first tube segment 110, a second tube segment 111 and a third tube segment 112, that is, the inner catheter 11 is a three-section structure, and the diameter of the first tube segment 110 is smaller than the diameter of the second tube segment 111, and the diameter of the third tube segment 112 is smaller than the diameter of the first tube segment 110, so that the proximal end of the first tube segment 110 is inserted into the distal end of the second tube segment 111, and the proximal end of the third tube segment 112 is inserted into the distal end of the first tube segment 110, and both ends of the first tube segment 110, the distal end of the second tube segment 111, and the proximal end of the third tube segment 112 are all located in the balloon 2, and the distal end of the balloon 2 is connected to the distal end of the third tube segment 112.

[0051] In addition, the electrode group 3 shown in the figure is arranged on the first pipe section 110 .

[0052] Embodiment three:

[0053] like Figure 3 The balloon catheter shown comprises a catheter body and a balloon 2. Among them:

[0054] The catheter body includes an outer catheter 10 and an inner catheter 11. The inner catheter 11 is inserted into the outer catheter 10, and the distal end of the inner catheter 11 extends out of the distal end of the outer catheter 10. The proximal end of the balloon 2 is connected to the distal end of the outer catheter 10, and the distal end of the balloon 2 is connected to the distal end of the inner catheter 11.

[0055] In this embodiment: the inner catheter 11 is composed of a first tube segment 110, a second tube segment 111 and a third tube segment 112, that is, the inner catheter 11 is a three-section structure, and the diameter of the first tube segment 110 is smaller than the diameters of the second tube segment 111 and the third tube segment 112, so that the proximal end of the first tube segment 110 is inserted into the distal end of the second tube segment 111, and the distal end of the first tube segment 110 is inserted into the proximal end of the third tube segment 112, and both ends of the first tube segment 110, the distal end of the second tube segment 111, and the proximal end of the third tube segment 112 are all located in the balloon 2, and the distal end of the balloon 2 is connected to the distal end of the third tube segment 112.

[0056] In addition, the electrode group 3 shown in the figure is arranged on the first pipe section 110 .

[0057] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A balloon catheter, comprising a catheter body and a balloon, wherein the catheter body comprises an outer catheter and an inner catheter, wherein the inner catheter is inserted into the outer catheter, and the distal end of the inner catheter extends out of the distal end of the outer catheter, the proximal end of the balloon is connected to the distal end of the outer catheter, and the distal end of the balloon is connected to the distal end of the inner catheter, characterized in that: The inner catheter comprises a first tube segment and a second tube segment. One end of the first tube segment is inserted into one end of the second tube segment. When the balloon is filled and pressurized, the first tube segment can slide relative to the second tube segment.

2. The balloon catheter according to claim 1, characterized in that: One end of the first pipe segment has a flared portion, the diameter of which is larger than the outer diameter of the first pipe segment; one end of the second pipe segment has a constricted portion, the diameter of which is smaller than the inner diameter of the second pipe segment, and the diameter of the flared portion is larger than the diameter of the constricted portion; the flared portion is located inside one end of the second pipe segment, and the constricted portion is interference fit with the first pipe segment.

3. The balloon catheter according to claim 1, characterized in that: A sealing ring is sleeved on the first pipe section inserted into one end of the second pipe section.

4. The balloon catheter according to claim 3, characterized in that: The sealing ring is provided with at least one; and / or The material of the sealing ring is selected from rubber or silicone.

5. The balloon catheter according to claim 1, characterized in that: The proximal end of the first tube segment is inserted into the distal end of the second tube segment, and the proximal end of the first tube segment and the distal end of the second tube segment are located inside the balloon, and the distal end of the balloon is connected to the distal end of the first tube segment.

6. The balloon catheter according to claim 1, characterized in that: The inner catheter also includes a third tube segment, the proximal end of the first tube segment is inserted into the distal end of the second tube segment, the proximal end of the third tube segment is inserted into the distal end of the first tube segment, and when the balloon is inflated and pressurized, the first tube segment can slide relative to the third tube segment.

7. The balloon catheter according to claim 1, characterized in that: The inner catheter also includes a third tube segment, the proximal end of the first tube segment is inserted into the distal end of the second tube segment, the distal end of the first tube segment is inserted into the proximal end of the third tube segment, and when the balloon is inflated and pressurized, the first tube segment can slide relative to the third tube segment.

8. The balloon catheter according to claim 6 or 7, characterized in that: Both ends of the first tube segment, the distal end of the second tube segment, and the proximal end of the third tube segment are located in the balloon, and the distal end of the balloon is connected to the distal end of the third tube segment.

9. The balloon catheter according to claim 1, characterized in that: The ductility of the inner catheter is lower than the ductility of the balloon.

10. The balloon catheter according to claim 1 or 9, characterized in that: The material of the inner catheter is selected from any one of nylon, Pebax, and PTFE; and / or The material of the balloon is selected from any one of nylon, Pebax and TPU.

11. The balloon catheter according to claim 1, characterized in that: The balloon catheter further comprises an electrode group, and the electrode group is arranged on the first tube segment and / or the second tube segment.

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