Balloon conveying microcatheter and using method thereof

Abstract

The invention relates to the technical field of medical instruments, in particular to a balloon delivery microcatheter and a using method thereof.The microcatheter comprises a handle, a balloon delivery pipe, a balloon delivery pipe and a balloon delivery pipe, the catheter body is connected with the handle, and the catheter body sequentially comprises a near-end tube, a balloon tube and a far-end tube from near to far; wherein the catheter body is of a double-cavity structure and comprises an inner cavity and an outer cavity, the inner cavity is a channel, one end of the inner cavity is communicated with the first connector, and the other end of the inner cavity penetrates to the end of the far-end tube and is used for conveying instruments, therapeutic drugs or diagnostic radiography liquid; one end of the outer cavity is communicated with the second connector, the other end of the outer cavity is communicated with the balloon tube, and the outer cavity is used for filling and pressure relief of the balloon tube. The balloon catheter has the functions of a micro catheter and a balloon catheter, a near-end blood vessel can be blocked, temporary blocking of local blood flow is achieved, the balloon catheter is further used for expanding the position, not attached to the wall, of an intravascular stent, the stent can be better attached to the blood vessel wall, and therefore pain and risks of a patient are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a balloon delivery microcatheter and a use method thereof. Background Art

[0002] With the continuous maturity of medical technology and the rapid development of interventional equipment, the application scope of microcatheters is also constantly expanding, such as coronary intervention, peripheral vascular intervention, neurovascular intervention, etc.

[0003] There are many types of microcatheters in the prior art, and their functions are also different. Some deliver coils to achieve aneurysm embolization, some deliver dense mesh stents to achieve blood flow guidance, some inject anesthetics and analgesics to assist in completing surgery, and some insert microcatheters into the jugular vein or subclavian vein to monitor the patient's central venous pressure and central venous oxygen saturation, evaluate the patient's circulatory function and fluid balance, and provide timely intravenous infusion, drug infusion, hemodialysis and other treatments. Secondly, microcatheters can also be used for arterial pressure monitoring and arterial catheter placement. By inserting the catheter into the patient's artery, the doctor can monitor the patient in real time and provide the patient with individualized treatment and hemodynamic monitoring.

[0004] However, most existing microcatheters have the function of delivering a single device, contrast fluid or therapeutic drug. If it is necessary to block the proximal blood flow, prevent the escape of thrombus or deliver drugs to the proximal blood vessels during surgery, other devices are needed to achieve local blood flow blockage. Such operations are relatively cumbersome for the surgeon during surgery, requiring more instruments and operating steps to complete the surgery, which prolongs the operation time and causes the patient to endure longer surgical pain. At the same time, the use of more therapeutic devices during surgery also increases the patient's medical expenses. Summary of the invention

[0005] In view of at least one of the above technical problems, the present invention provides a balloon delivery microcatheter and a method of using the same, which adopts structural improvements to increase the function of the microcatheter and reduce the frequency of intraoperative instrument exchange.

[0006] According to a first aspect of the present invention, there is provided a balloon delivery microcatheter, comprising:

[0007] A handle, wherein the handle has a first interface and a second interface;

[0008] A catheter body connected to the handle, wherein the catheter body includes a proximal tube, a balloon tube and a distal tube in sequence from proximal to distal;

[0009] Among them, the catheter body is a double-lumen structure, including an inner lumen and an outer lumen, the inner lumen is a channel, one end of which is connected to the first interface, and the other end passes through the end of the distal tube, and is used to transport instruments, therapeutic drugs or diagnostic contrast fluid; the outer lumen is a filling cavity, one end of which is connected to the second interface, and the other end is connected to the balloon tube, and is used for filling and relieving pressure of the balloon tube.

[0010] In some embodiments of the present invention, an inner stress diffusion tube is further included, one end of the inner stress diffusion tube is sleeved on the proximal tube and the other end is connected to the handle, and the inner stress diffusion tube is made of PEBAX material.

[0011] In some embodiments of the present invention, an outer stress diffusion tube is further included, one end of the outer stress diffusion tube is sleeved on the inner stress diffusion tube, and the other end is connected to the handle, and the outer stress diffusion tube is made of TPE material.

[0012] In some embodiments of the present invention, the proximal tube includes, from inside to outside, an inner lining tube, a reinforcing braided layer, an outer tube reinforcing layer and an outer tube layer, wherein:

[0013] The inner lining tube is made of PTFE, the reinforcing braided layer is a stainless steel wire braided layer, and the outer tube reinforcing layer and the outer tube layer are both made of materials with a gradual change in hardness from hard to soft from near to far.

[0014] In some embodiments of the present invention, the materials of the outer tube reinforcement layer from near to far are PEBAX72D, PEBAX63D, PEBAX55D, PEBAX35D and TPU materials; the materials of the outer tube layer from near to far are NYLON, PEBAX72D, PEBAX63D, PEBAX55D, PEBAX35D and POE materials.

[0015] In some embodiments of the present invention, the balloon tube comprises, from the inside to the outside, an inner lining tube, a reinforced braided layer, an outer tube reinforcement layer, an outer tube layer and a balloon layer, the balloon layer is made of TPU material, the gap between the outer tube layer and the outer tube reinforcement layer constitutes the filling cavity, and the outer tube layer has a filling hole inside the balloon layer.

[0016] In some embodiments of the present invention, a plurality of filling holes are provided and staggered in the circumferential direction, and the balloon layer presents a cylindrical structure after being filled.

[0017] In some embodiments of the present invention, the distal tube includes an inner lining tube, a reinforcing braided layer and an outer tube reinforcing layer from inside to outside, and a developing ring is provided in the outer tube reinforcing layer of the distal tube.

[0018] According to a second aspect of the present invention, there is also provided a method for using the balloon delivery microcatheter as described in any one of the first aspects, comprising the following steps:

[0019] Insert the guide wire to the diseased part of the blood vessel;

[0020] Insert the catheter body from the proximal end of the guide wire and move the catheter body to the target position;

[0021] The balloon tube is inflated to occlude the blood vessel, and the device, contrast fluid or therapeutic drugs are delivered through the catheter body.

[0022] In some embodiments of the present invention, when the device is a vascular stent, after the stent is delivered to the position and released, the following steps are further included:

[0023] The adhesion state of the vascular stent is observed. If the vascular stent is not well adhered to the wall, the balloon tube is moved to the part where the vascular stent is not well adhered to the wall, and the balloon tube is filled so that the balloon tube expands the vascular stent.

[0024] The beneficial effects of the present invention are as follows: the present invention uses a balloon tube arranged at the distal end of the catheter body, and the balloon tube is connected to the second interface on the handle. When the balloon tube is filled, it can block the blood vessel to achieve the effect of blocking blood flow. At the same time, the catheter body in the present invention can also be used to deliver instruments, therapeutic drugs or diagnostic contrast fluids, and has the functions of both a microcatheter and a balloon catheter, and can block the proximal blood vessel to achieve temporary blocking of local blood flow, thereby preventing thrombus from escaping to the proximal blood vessel or preventing the delivered drug from flowing to the proximal blood vessel. In addition, the balloon tube in the present invention is also used to expand the non-adherent part of the vascular stent, so that the stent can better adhere to the vascular wall. The balloon delivery microcatheter of the present invention has multiple functions, saves raw material costs, and also reduces the frequency of doctors exchanging and using multiple equipment, thereby reducing the pain and risks of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of a balloon delivery microcatheter in an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of an axial cross-sectional structure of a catheter body in an embodiment of the present invention;

[0028] Figure 3 In the embodiment of the present invention Figure 2 AA section structural diagram;

[0029] Figure 4 In the embodiment of the present invention Figure 2 BB section structure schematic diagram;

[0030] Figure 5 In the embodiment of the present invention Figure 2 The CC section structure diagram in FIG.

[0031] Figure 6 This is a schematic diagram of the structure of the catheter body when delivering a vascular stent in an embodiment of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure when the balloon tube is pushed into the interior of the vascular stent in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure when the proximal end of the vascular stent is expanded by the balloon tube in an embodiment of the present invention;

[0034] Fig. 9 This is a schematic diagram of the structure when the balloon tube expands the middle of the vascular stent in an embodiment of the present invention;

[0035] Fig.10 This is a schematic diagram of the structure when the balloon tube expands the distal end of the vascular stent in an embodiment of the present invention;

[0036] Fig.11 It is a schematic diagram of the structure of the balloon tube in an embodiment of the present invention when it is inflated and the deflated balloon section is not deployed;

[0037] Fig.12 It is a schematic structural diagram of the balloon tube in an embodiment of the present invention when the balloon section is expanded and contracted when the balloon tube is filled. Explanation of the reference numerals: 1. handle; 2. catheter body; 21. proximal tube; 211. lining tube; 212. reinforced braided layer; 213. outer tube reinforcement layer; 214. outer tube layer; 22. balloon tube; 22a. contraction balloon segment; 22b. fragile hole wall; 221. balloon layer; 222. filling hole; 23. distal tube; 23a. developing ring; 2a. inner cavity; 2b. outer cavity; 3. inner layer stress diffusion tube; 4. outer layer stress diffusion tube. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] like Figures 1 to 5 The balloon delivery microcatheter shown includes a handle 1 and a catheter body 2. The catheter body 2 is connected to the distal end of the handle 1. In the embodiments of the present invention, the proximal end refers to the end close to the operator, and the distal end refers to the end away from the operator. The main body of the handle 1 is made of PCTG or PC. PCGT refers to polyethylene terephthalate copolyester, which is a modified copolymer of PETG (polyethylene terephthalate). It is a non-crystalline copolyester material with good transparency and mechanical properties; PC refers to polycarbonate, which is a widely used engineering plastic because of its high load, impact resistance and thermal stability. The handle 1 has a first interface and a second interface; in some embodiments of the present invention, the first interface and the second interface both use a 6% external locking Luer connector to achieve connection and locking with the supporting equipment, which can play a role in safety and stability, preventing leakage and reducing the risk of infection.

[0042] Please continue to refer to Figure 1 In an embodiment of the present invention, the catheter body 2 includes a proximal tube 21, a balloon tube 22 and a distal tube 23 from near to far; in an embodiment of the present invention, the balloon tube 22 is different from an ordinary balloon. It is not a spherical structure, but a tubular structure, which can become a cylindrical structure after being filled.

[0043] In the embodiment of the present invention, the catheter body 2 is a double-lumen structure, including an inner lumen 2a and an outer lumen 2b, wherein the inner lumen 2a is a channel, one end of which is connected to the first interface and the other end of which is connected to the end of the distal tube 23, and is used to deliver instruments, therapeutic drugs or diagnostic contrast fluid; the outer lumen 2b is a filling lumen, one end of which is connected to the second interface and the other end of which is connected to the balloon tube 22, and is used to fill and relieve pressure of the balloon tube 22. With such a design, the medium can be delivered through the first interface, and the filling and pressure relief of the balloon tube 22 can be achieved through the second interface.

[0044] In the above embodiment, the balloon tube 22 is arranged at the distal end of the catheter body 2, and the balloon tube 22 is connected to the second interface on the handle 1. When the balloon tube 22 is filled, it can block the blood vessel to achieve the effect of blocking blood flow. At the same time, the catheter body 2 in the present invention can also be used to deliver instruments, therapeutic drugs or diagnostic contrast fluids, and has the functions of both a microcatheter and a balloon catheter. It can block the proximal blood vessels and achieve temporary blocking of local blood flow, thereby preventing thrombus from escaping to the proximal blood vessels or preventing the delivered drugs from flowing to the proximal blood vessels. In addition, the balloon tube 22 in the present invention is also used to expand the non-adherent part of the vascular stent, so that the stent can better adhere to the vascular wall. The balloon delivery microcatheter of the present invention has multiple functions, saves raw material costs, and also reduces the frequency of doctors exchanging multiple equipment, thereby reducing the pain and risks of patients.

[0045] Based on the above examples, please continue to refer to Figure 1 In the embodiment of the present invention, it also includes an inner stress diffusion tube 3, one end of the inner stress diffusion tube 3 is sleeved on the proximal tube 21 and the other end is connected to the handle 1, and the inner stress diffusion tube 3 is made of PEBAX material. In the embodiment of the present invention, PEBAX material is a high-performance thermoplastic elastomer, which is formed by copolymerization of elastic polyether and rigid polyamide blocks. By setting the inner stress diffusion tube 3, the stress concentration at the connection part with the proximal tube 21 can be buffered.

[0046] For further information, please refer to Figure 1 In the embodiment of the present invention, an outer stress diffusion tube 4 is also included. One end of the outer stress diffusion tube 4 is sleeved on the inner stress diffusion tube 3, and the other end is connected to the handle 1. The outer stress diffusion tube 4 is made of TPE material. TPE material is a thermoplastic elastomer, which has both rubber elasticity and thermoplastic processing characteristics. The setting of the outer stress diffusion tube 4 can further improve the stress dispersion ability of the catheter connection, and form a double-layer structure with the inner stress diffusion tube 3, thereby providing a more comprehensive stress relief effect.

[0047] like Figure 2 and Figure 3As shown in , the proximal tube 21 includes an inner lining tube 211, a reinforcing braided layer 212, an outer tube reinforcing layer 213 and an outer tube layer 214 from the inside to the outside, wherein the inner lining tube 211 is made of PTFE, the reinforcing braided layer 212 is a stainless steel wire braided layer, and the outer tube reinforcing layer 213 and the outer tube layer 214 are made of materials with a gradual change in hardness from hard to soft from near to far. By setting up this structure, the proximal support strength of the catheter body 2 can be guaranteed, and at the same time, the distal end has a soft characteristic, which is convenient for penetrating into the tortuous blood vessels. In addition, in an embodiment of the present invention, PTFE is made of polytetrafluoroethylene, which is a material with a low friction coefficient, which can effectively reduce the friction of the guide wire and other medical equipment inside the catheter body 2, making the operation smoother.

[0048] Please continue to refer to Figure 2 In some embodiments of the present invention, the materials of the outer tube reinforcement layer 213 from near to far are PEBAX72D, PEBAX63D, PEBAX55D, PEBAX35D and TPU materials; the materials of the outer tube layer 214 from near to far are NYLON, PEBAX72D, PEBAX63D, PEBAX55D, PEBAX35D and POE materials. In an embodiment of the present invention, the outer tube reinforcement layer 213 and the outer tube layer 214 both adopt a material combination with a hardness gradually decreasing from the proximal end to the distal end. This structural design can further improve the compliance and operational performance of the catheter body 2; wherein, PEBAX is a polyether block amide material, wherein the value before D represents the hardness, and the larger the number, the higher the hardness; TPU is thermoplastic polyurethane, which is the softest material at the distal end and provides excellent softness and elasticity, ensuring that the distal tube 23 passes smoothly in a complex vascular environment while reducing damage to the tissue; on the outer tube layer 214, NYLON is a nylon material, which has high hardness and wear resistance, and can provide additional mechanical support as a proximal material; POE is a polyolefin elastomer, which is arranged at the balloon tube 22, so that the balloon tube 22 has better compliance.

[0049] In an embodiment of the present invention, the balloon tube 22 includes, from inside to outside, an inner lining tube 211, a reinforcing braided layer 212, an outer tube reinforcing layer 213, an outer tube layer 214 and a balloon layer 221. The balloon layer 221 is made of TPU material. The gap between the outer tube layer 214 and the outer tube reinforcing layer 213 constitutes a filling cavity. The outer tube layer 214 has a filling hole 222 inside the balloon layer 221. In an embodiment of the present invention, there is a gap between the outer tube reinforcing layer 213 and the outer tube layer 214, which constitutes a filling cavity. Through the setting of the filling hole 222, the liquid filled from the second interface can enter the balloon layer 221. The balloon layer 221 is made of TPU material, that is, thermoplastic polyurethane material, which has high elasticity, wear resistance and chemical corrosion resistance, and has good plasticity and biocompatibility. The balloon layer 221 made of TPU material can withstand high-pressure filling without bursting, and can also provide sufficient elasticity to allow the balloon to quickly return to its original state after the pressure is removed; thus, it can adapt to any uneven vascular space. At the same time, the balloon filling pressure is very small, which is more suitable for fragile and smaller blood vessels. In addition, in an embodiment of the present invention, a plurality of filling holes 222 are provided, and they are staggered in the circumferential direction, and the balloon layer 221 presents a cylindrical structure after filling. In one embodiment of the present invention, 6 filling holes 222 are provided, and the aperture of the filling holes 222 is 0.15 mm, and they are staggered in the circumferential direction. The staggering here can be uniformly distributed in the circumferential direction and staggered in the axial direction. This arrangement of the filling holes 222 can achieve rapid filling and pressure relief of the balloon.

[0050] In an embodiment of the present invention, Figure 2 and Figure 5 As shown in , the distal tube 23 includes an inner lining tube 211, a reinforcing braided layer 212 and an outer tube reinforcing layer 213 from the inside to the outside, and a developing ring 23a is provided in the outer tube reinforcing layer 213 of the distal tube 23. In the embodiment of the present invention, the material of the inner lining tube 211 and the reinforcing braided layer 212 is the same as that in the above text, and the appearance reinforcing layer is made of TPU material, which has excellent toughness, good fluidity and processability, so that the appearance of the processed distal tube 23 is smooth and smooth, and the strength of the catheter dissolution mark can be improved; through the setting of the developing ring 23a, it has a good developing effect under the X-ray device, which can intuitively and effectively guide the clinician to observe the position of the distal end of the catheter. In addition, in the embodiment of the present invention, a developing ring 23a is also provided on at least one end of the balloon tube 22 to confirm the position of the balloon tube 22, and the developing ring 23a can be made of alloy materials such as 90Pt / 10Ir.

[0051] In an embodiment of the present invention, a method for using the above-mentioned balloon delivery microcatheter is also disclosed, comprising the following steps:

[0052] Insert the guide wire to the diseased part of the blood vessel;

[0053] Insert the catheter body 2 from the proximal end of the guide wire and move the catheter body 2 to the target position;

[0054] The balloon tube 22 is filled to block the blood vessel, and instruments, contrast fluid or therapeutic drugs are delivered through the catheter body 2.

[0055] like Figure 6 As shown in the figure, it is a schematic diagram of the structure of delivering a vascular stent in an embodiment of the present invention. The doctor can select a microcatheter of appropriate specifications to deliver the corresponding stent according to clinical needs. When performing the specific operation, the vascular stent is introduced into the sheath and guided through the balloon delivery microcatheter handle 1 and the inner cavity 2a to the position of the target blood vessel. When the device is a vascular stent, after the stent is delivered to the position and released, the following steps are also included:

[0056] Observe the state of the stent adhesion. If the stent is not well adhered to the wall, withdraw the balloon tube 22 and move it to the part where the stent is not well adhered to the wall, fill the balloon tube 22, and expand the stent. Figure 7 As shown in FIG. 1 , the position of the balloon tube 22 is adjusted so that the position of the vascular stent that needs to be expanded is located in the middle of the two developing rings 23a of the balloon tube 22, and then the balloon tube 22 is filled to expand and massage the non-adherent part of the vascular stent, as shown in FIG. Figure 8 As shown in FIG, when the proximal end of the vascular stent is not well adhered to the wall, the balloon tube 22 is placed at the proximal end. If the middle part or the distal part of the vascular stent is not well adhered to the wall, as shown in FIG. Fig. 9 and Fig.10 As shown in , the balloon tubes 22 are adjusted to corresponding positions for expansion.

[0057] In the embodiment of the present invention, in order to reduce the position adjustment of the balloon tube 22, the structure of the balloon tube 22 is also improved. Fig.11 and Fig.12 As shown in the figure, a shrink balloon segment 22a made of TPU material is provided at both ends of the balloon tube 22, and a fragile hole wall 22b is provided on the two end walls of the balloon tube 22. The thickness of this part is thinner than that of other parts, so that after the filling pressure reaches a certain level, the fragile hole wall 22b is squeezed and the filling liquid enters into the shrink balloon segment 22a, so that the shrink balloon segment 22a extends axially toward both sides. Through the setting of this structure, the expansion range of the balloon tube 22 on the vascular stent can be improved, thereby reducing the adjustment of the position of the balloon tube 22 and improving the convenience of operation.

[0058] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A balloon delivery microcatheter, characterized in that: include: A handle, wherein the handle has a first interface and a second interface; A catheter body connected to the handle, wherein the catheter body includes a proximal tube, a balloon tube and a distal tube in sequence from proximal to distal; Wherein, the catheter body is a double-lumen structure, including an inner lumen and an outer lumen, the inner lumen is a channel, one end of which is connected to the first interface, and the other end is connected to the end of the distal tube, and is used to transport instruments, therapeutic drugs or diagnostic contrast fluid; The outer cavity is a filling cavity, one end of which is connected to the second interface and the other end of which is connected to the balloon tube, and is used for filling and relieving pressure of the balloon tube.

2. The balloon delivery microcatheter according to claim 1, characterized in that: It also includes an inner stress diffusion tube, one end of which is sleeved on the proximal tube and the other end is connected to the handle, and the inner stress diffusion tube is made of PEBAX material.

3. The balloon delivery microcatheter according to claim 2, characterized in that: It also includes an outer stress diffusion tube, one end of which is sleeved on the inner stress diffusion tube, and the other end is connected to the handle, and the outer stress diffusion tube is made of TPE material.

4. The balloon delivery microcatheter according to claim 1, characterized in that: The proximal tube includes an inner lining tube, a reinforcing braided layer, an outer tube reinforcing layer and an outer tube layer from the inside to the outside, wherein: The inner lining tube is made of PTFE, the reinforcing braided layer is a stainless steel wire braided layer, and the outer tube reinforcing layer and the outer tube layer are both made of materials with a gradual change in hardness from hard to soft from near to far.

5. The balloon delivery microcatheter according to claim 4, characterized in that: The materials of the outer tube reinforcement layer from near to far are PEBAX72D, PEBAX63D, PEBAX55D, PEBAX35D and TPU; the materials of the outer tube layer from near to far are NYLON, PEBAX72D, PEBAX63D, PEBAX55D, PEBAX35D and POE.

6. The balloon delivery microcatheter according to claim 5, characterized in that: The balloon tube includes an inner lining tube, a reinforced braided layer, an outer tube reinforcement layer, an outer tube layer and a balloon layer from the inside to the outside. The balloon layer is made of TPU material. The gap between the outer tube layer and the outer tube reinforcement layer constitutes the filling cavity. The outer tube layer has a filling hole inside the balloon layer.

7. The balloon delivery microcatheter according to claim 6, characterized in that: The filling holes are provided in plurality and are staggeredly distributed in the circumferential direction, and the balloon layer presents a cylindrical structure after being filled.

8. The balloon delivery microcatheter according to claim 5, characterized in that: The distal tube comprises an inner lining tube, a reinforcing braided layer and an outer tube reinforcing layer in sequence from the inside to the outside, and a developing ring is arranged inside the outer tube reinforcing layer of the distal tube.

9. A method for using the balloon delivery microcatheter according to any one of claims 1 to 8, characterized in that: The following steps are involved: Insert the guide wire to the diseased part of the blood vessel; Insert the catheter body from the proximal end of the guide wire and move the catheter body to the target position; The balloon tube is inflated to occlude the blood vessel, and the device, contrast fluid or therapeutic drugs are delivered through the catheter body.

10. The method for using the balloon delivery microcatheter according to claim 9, characterized in that: When the device is a vascular stent, after the stent is delivered to the position and released, the following steps are also included: The adhesion state of the vascular stent is observed. If the vascular stent is not well adhered to the wall, the balloon tube is moved to the part where the vascular stent is not well adhered to the wall, and the balloon tube is filled so that the balloon tube expands the vascular stent.

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