184 results about "Dilatation catheter" patented technology

The invention provides a balloon dilatation catheter, and belongs to the technical field of balloon dilatation catheters. The balloon dilatation catheter comprises a catheter body, the far end of the catheter body is provided with a balloon body used for dilating a narrow part, and the near end of the catheter body is provided with an operating handle used for charging and discharging a filling medium into the balloon body. A flow channel allowing blood to penetrate through is formed in the balloon body and / or between the balloon body and the outer side wall of the catheter body in the axial extending direction of the catheter body, in the working process, after the balloon body is filled, a narrow part is treated, and the blood in the narrow part penetrates through the flow channel to continue to be circulated. The balloon is mainly used for solving the technical problems that in the prior art, when a balloon dilates, blood flow is blocked, consequently, far-end blood supply is insufficient, and the drug transfer effect is affected due to insufficient contact time of the balloon and the blood vessel wall.

The utility model relates to an anti-fracture high-pressure balloon dilatation catheter. A balloon body of a high-pressure balloon comprises three layers of structures which are sequentially attached to form a whole. The inner layer is made of materials capable of tolerating high pressure, the middle layer is of a net-shaped structure formed by weaving metal nets, the structure can guarantee that the balloon does not deform under the high pressure condition, meanwhile, the original vein stent can not make direct contact with the materials of the inner layer, cutting of the stent to the balloon body is eradicated, and the balloon is prevented from being broken. The outer layer is made of materials with high toughness and abrasion resistance, it can be guaranteed that the metal net cannot be tangled with the intravenous stent in the expansion and contraction process of the balloon, contraction and withdrawing of the balloon are facilitated, the outer layer is not prone to being damaged by the edge of the stent due to the high toughness and abrasion resistance of the balloon, and even if the outer layer is damaged, the balloon can not be damaged. And the stent still cannot be in direct contact with the inner-layer balloon body, so that the balloon body cannot be broken.

The utility model provides a balloon dilatation catheter. The balloon dilatation catheter comprises a catheter body, a blood flow tube and a balloon, the blood flow tube comprises a first tube body and a second tube body, the second tube body is located in the first tube body, the outer wall of one side of the second tube body is connected with the inner wall of one side of the first tube body, and a blood flow cavity is formed between the outer wall of the other side of the second tube body and the inner wall of the other side of the first tube body; the balloon is connected to the outer wall of the first tube body in a sleeving mode, and a filling cavity is formed between the balloon and the first tube body; the far end of the catheter body is inserted into the second catheter body, and a first medium cavity is formed between the far end of the catheter body and the second catheter body; and a through part for communicating the first medium cavity with the filling cavity is arranged at the joint of the first pipe body and the second pipe body. The balloon dilatation device can solve the problem of blood flow supply of a far-end blood vessel in the balloon dilatation period.

Elongate medical devices with an expandable structure including elongated splines and a distal hub. An elongate medical device includes a handle including a control mechanism, a catheter shaft, an expandable structure including elongated splines and a distal hub, wherein each of the elongated splines includes a shape memory material and an interactive element, wherein each of the elongated splines includes a respective spline proximal end and a spline distal end, wherein each of the spline proximal ends is connected to the catheter shaft distal end, and wherein each of the spline distal ends is connected to the distal hub, and a deflection control member connected to the distal hub, wherein the control mechanism is drivingly coupled to the distal hub via the deflection control member and operable to selectively vary a position of the distal hub relative to the catheter shaft distal end to selectively vary an amount of expansion of the expandable structure, wherein a shape of the expandable structure is produced via a combination of the shape memory material and the position of the distal hub relative to the catheter distal end.

An expandable catheter system includes a catheter body and a plurality of expansile elements connected at a distal region of the catheter body. The system further comprises an expansion mechanism capable of independently adjusting the radial size of each expansile element when in an actuated state. This independent adjustment allows for precise control over the expansion of each element, facilitating targeted treatment or intervention within a body lumen. The system is designed to enhance the adaptability and effectiveness of catheter-based procedures by providing customizable expansion capabilities tailored to specific anatomical or procedural requirements.

The invention discloses a mini midline catheter, and relates to the technical field of medical instruments, the mini midline catheter comprises a catheter sheath, an expansion sheath and a protective sleeve, the catheter sheath comprises a catheter joint, a protective sleeve and an implantation catheter, the expansion sheath comprises an expansion joint, a locking ring and an expansion catheter, the catheter sheath wraps the expansion sheath, and the protective sleeve is connected with the expansion joint. The implantation catheter is wrapped outside the expansion catheter, the length of the expansion catheter is larger than that of the implantation catheter, the catheter connector is connected with the locking ring Luer, and the implantation catheter is made of a material with the biological risk assessment end point reaching the long-term or lasting contact level of circulating blood externally connected into a medical device. The dilation catheter and the dilation joint are connected through an injection molding and rubber coating process, and the implantation catheter and the catheter joint are connected through an injection molding and rubber coating process. The mini midline catheter is convenient, accurate and safe to operate, and the infusion time is prolonged compared with an indwelling needle scheme.

The invention relates to the technical field of medical instruments, in particular to a paclitaxel drug coating balloon dilatation catheter and a preparation method and application thereof.The paclitaxel drug coating comprises a substrate layer, a middle layer and an outer layer; the substrate layer comprises paclitaxel and a hydrophilic excipient; the middle layer comprises a lipophilic excipient and a temperature response type polymer; and the outer layer comprises a pH sensitive polymer. The substrate layer is combined with the surface of the balloon, so that excellent conveying stability is provided, the medicine is effectively prevented from falling off prematurely in the conveying process of the catheter, and the firmness of the coating is improved; a micropore network structure is formed in the middle layer, the network structure is expanded under the body temperature condition, the porosity is increased, slow release of the medicine is achieved, the absorption amount of the medicine on the blood vessel wall is effectively increased, and the medicine effect time is prolonged; the solubility of the outer layer is improved in a slightly acidic blood vessel wall environment, so that the release of the medicine is further promoted, and the effective release of the medicine on the blood vessel wall is ensured.

The present invention relates to a balloon dilatation catheter, which includes a double-layer balloon assembly and a drill bit assembly. The double-layer balloon assembly includes an inner tube, an outer tube sleeved outside the inner tube, an outer balloon arranged at the distal end of the outer tube, and an inner balloon arranged at the distal end of the inner tube. The inner balloon is located in the outer balloon, and the distal ends of the inner balloon and the outer balloon are provided with end covers that can be opened and closed; the drill bit assembly includes a movable catheter and a drill bit structure arranged at the distal end of the movable catheter, the movable catheter is inserted in the inner tube, and the balloon dilatation catheter has a first working state and a second working state. In the first working state, the drill bit structure is located in the inner balloon and the end cover is closed; in the second working state, at least part of the drill bit structure is located outside the distal end of the inner balloon and the end cover is open; the balloon dilatation catheter is switched between the first working state and the second working state by operating the movable catheter, and the drill bit structure can extend from the distal end of the inner balloon to perform in-depth drilling on thrombus tissue.

The invention provides a balloon, a balloon dilatation catheter and a stent system, and particularly provides a balloon, a balloon dilatation catheter and a stent system suitable for bifurcated vascular lesion areas. The balloon comprises a balloon body, a far-end body and a near-end body, the far-end body comprises a first cone part, the near-end body comprises a second cone part, and at least the size of the cone angle alpha 1 of the first cone part and the size of the diameter d of the balloon in the expansion state meet the following relational expression: alpha 1 = k1ld + b1; wherein k1 belongs to [11.009, 21.478], b1 belongs to [7.98, 20.8], d is more than or equal to 5 and less than or equal to 16, and d is a positive integer. The balloon dilatation catheter comprises the balloon, a pushing tube and a catheter seat. According to the balloon, the balloon dilatation catheter and the stent system, the structure of the balloon is improved and optimized, and the balloon, the balloon dilatation catheter and the stent system are simple in structure, easy to produce, capable of achieving industrialization, low in cost, easy to operate clinically and capable of accurately releasing and positioning the stent. Therefore, the positioning accuracy of the stent in a bifurcated vascular lesion area and the success rate of an operation are greatly improved.

The invention relates to the technical field of manufacturing of medical instruments, in particular to an intracranial controllable drug balloon dilatation catheter and a drug delivery method for a narrow area of a blood vessel. According to the intracranial controllable medicine balloon dilatation catheter, the inner-layer catheter body is arranged in the outer-layer catheter body in a sleeved mode and fixedly connected with the far end of the outer-layer catheter body; the balloon is assembled on the outer-layer tube body and is provided with a plurality of dosing holes along the circumferential direction; a medicine adhesion layer is compounded on the surface of the balloon section of the outer-layer tube body; the stress releasing pipe is connected to the end, close to the operation end, of the outer-layer pipe body. The Y-shaped tube base is connected to the end, away from the outer-layer tube body, of the stress releasing tube, one connector is connected with an injection device to inject medicine carriers into the balloon, and the other connector is used for a guide wire to penetrate through. When intracranial vascular stenosis is treated, directional drug release can be achieved by means of the drug delivery holes and the drug adhesion layer. The medicine is sprayed to the focus through the administration hole, the medicine is promoted to permeate into the middle layer of the blood vessel wall through the attaching force generated by the balloon expansion, the problems of non-uniform liquid medicine distribution, insufficient permeation and the like are effectively solved, and the local medicine concentration and the treatment effect are improved.

The invention relates to the technical field of interventional medical instruments, and discloses a photodynamic balloon dilatation catheter and a laser transmitter. The balloon is connected to the periphery of the far end of the catheter, and the balloon has a full state and a folded state; the outer surface of the balloon is suitable for being coated with a photosensitizer; the optical fiber assembly is arranged in the balloon, and the optical fiber assembly comprises an optical fiber and a shading tube arranged outside the optical fiber in a sleeving mode; the shading tube and the optical fiber are driven to slide relatively, so that the length of the optical fiber exposed out of the shading tube is adjusted. The light shielding tube and the optical fiber are driven to slide relatively, so that the light emitting length of the optical fiber in the balloon can be adjusted, and the treatment universality of the photodynamic balloon dilatation catheter is improved.

The embodiment of the invention provides an expansion catheter device. The dilation catheter device comprises a catheter body assembly and a balloon body assembly. The pipe body assembly comprises a first pipe body and a second pipe body which extend in the same axial direction and can move relative to the axial direction. The second pipe body penetrates through the first pipe body. The balloon body assembly comprises an expansion balloon body and an interception balloon body which are arranged at the far end of the second tube body at an interval; the expansion bag body and the interception bag body are arranged in an expandable or contractible mode. Wherein the expansion bag body and the interception bag body are used for inputting filler to expand when the bag body assembly is exposed out of the first tube body along with relative axial movement, and a thrombus interception space is defined by the expansion bag body and the interception bag body and the blood vessel wall, so that at least part of thrombus extruded by the expansion bag body enters the thrombus interception space; and the first tube body enters the thrombus interception space to perform thrombus suction action. The expanded intercepting capsule body can intercept part of thrombus which falls off due to extrusion, and the thrombus is prevented from flowing to the far end of a blood vessel and causing embolism; and the first tube body can also suck the intercepted part of thrombus out of the body.

The invention relates to the technical field of medical apparatus and instruments, and discloses a balloon dilatation catheter which comprises an inner tube, an outer tube, a balloon and a rotating adapter. And the outer pipe sleeves the outer side of the inner pipe. The balloon sleeves the outer side of the far end of the inner tube, the far end of the balloon is connected and sealed with the far end of the inner tube, and the near end of the balloon is connected with the far end of the outer tube. The rotating adapter sleeves the outer side of the near end of the inner tube, the far end of the rotating adapter is connected with the near end of the outer tube, the rotating adapter is used for driving the outer tube to rotate relative to the inner tube, and the balloon is suitable for rotating relative to the inner tube under the driving of the outer tube and forming a torsional folding state. After pressure relief of the balloon is completed, the near end of the balloon can be driven to rotate relative to the far end by rotating the adapter and the outer tube until the balloon is in a twisted folded state, the balloon in the twisted folded state can reduce the outer diameter of the balloon to a great extent, the operation difficulty of withdrawing the balloon is reduced, and damage to the blood vessel wall when the balloon is withdrawn is avoided.

The utility model relates to the technical field of dilation catheters, and discloses a double-cavity tube of a PTA (pure terephthalic acid) balloon dilation catheter, which comprises a handle component, a double-cavity tube fitting is fixedly connected to the side end of the handle component, a guide seat is fixedly connected to the bottom end of the double-cavity tube fitting, an insertion opening is formed in the bottom end of the guide seat, and a through hole is formed in the insertion opening. According to the utility model, through the cooperative arrangement of the guide seat, the protection assembly, the extension plate and other structures, if a medical worker accidentally touches the pull plate in the process of operating the double-cavity pipe fitting, the spring is driven to be stretched, and the spring is immediately shrunk after being stretched, so that the safety of the double-cavity pipe fitting is ensured, and the safety of the double-cavity pipe fitting is ensured. The protection plate is still in a closed state, so that most of the protection plate is not easy to open due to accidental touch of medical staff, and pollutants are not easy to enter a guide wire cavity.

Elongate medical devices with an expandable structure including elongated splines and a distal hub. An elongate medical device includes a handle including a control mechanism, a catheter shaft, and an expandable structure including elongated splines and a distal hub. Each of the elongated splines includes a shape memory material and an interactive element. Each of the elongated splines includes a respective spline proximal end and a spline distal end. Each of the spline proximal ends is connected to the catheter shaft distal end. Each of the spline distal ends is connected to the distal hub. A deflection control member is connected to the distal hub. The control mechanism is drivingly coupled to the distal hub via the deflection control member and operable to selectively vary a position of the distal hub relative to the catheter shaft distal end to selectively vary an amount of expansion of the expandable structure.

The invention provides a pressure adjusting system and a method for adjusting the pressure of fluid in an inner cavity of medical equipment, and relates to a method for controlling a pressure control pump to enable the pressure of the fluid in the inner cavity of the medical equipment to change within a period of time. A coronary artery blood vessel remodeling catheter, a peripheral balloon dilatation catheter, a peripheral blood vessel remodeling catheter, an intracranial laser balloon dilatation catheter, a drug coating balloon dilatation catheter, a photodynamic balloon catheter, a mastoid balloon catheter, a constraint type balloon dilatation catheter and a spinous process balloon can be made. Expansion and contraction of a balloon body in a balloon catheter such as a drug delivery balloon catheter are regularly changed within a period of time, and therefore the treatment effect is better achieved.

The utility model discloses a balloon dilatation catheter which comprises a catheter body, the catheter body comprises a near-end catheter section, a variable-diameter catheter section and a far-end catheter section which are sequentially arranged from the near end to the far end, the outer diameter of the near-end catheter section is larger than that of the far-end catheter section, and the variable-diameter catheter section is connected between the near-end catheter section and the far-end catheter section; the outer diameter of the variable-diameter catheter section is gradually reduced in the direction from the near-end catheter section to the far-end catheter section. The balloon is connected to the far-end catheter section and can expand in the radial direction relative to the far-end catheter section. By means of the design, the variable-diameter catheter section between the near-end catheter section and the far-end catheter section is in a smooth gradual change process, no step exists, and the problems that in the prior art, a catheter is prone to being broken at the step-shaped position, and the step-shaped catheter is prone to causing damage to blood vessels are solved.

The invention relates to a double-layer medicine balloon dilatation catheter which comprises a double-layer balloon, the double-layer balloon comprises an outer-layer balloon and an inner-layer balloon, the outer-layer balloon comprises a flexible medicine balloon, and the inner-layer balloon comprises a pressurizing supporting balloon; the double-layer balloon is connected with an outer tube, the outer tube comprises an inner-layer balloon pressurizing cavity and an outer-layer balloon pressurizing cavity, a buffering cavity is formed between the outer-layer balloon pressurizing cavity and the outer-layer balloon, and a pressurizing assembly is arranged at the near end of the outer tube; the outer-layer balloon comprises a frosted surface located on the outer side surface, and the spraying medicine is attached to and combined with the frosted surface; a shock wave emitter is arranged between the outer-layer balloon and the inner-layer balloon, and the shock wave emitter is arranged at the position, close to the connecting portion of the outer-layer balloon and the inner-layer balloon, of the balloon body and far away from the outer-layer balloon. Precise attachment of the medicine balloon on a diseased region can be achieved, loss of medicine in the conveying process is reduced, and meanwhile the treatment effect of the medicine acting on the diseased region is guaranteed.

The utility model relates to an intracranial laser balloon dilatation catheter, which comprises a catheter, a laser balloon fixed on the catheter and communicated with the catheter, and a catheter seat fixed and communicated with one end, far away from the laser balloon, of the catheter, a positioning claw is arranged on one side, close to the catheter seat, of the laser balloon, and the positioning claw is fixed on the catheter. The positioning claws are in a funnel shape formed by annularly arranging a plurality of positioning wires, and the ends, with the large opening diameter, of the positioning claws face the laser balloon; the utility model has the advantages that when the laser is continuously irradiated, the laser can be ensured to irradiate in the middle and the blood circulation can be ensured.

The invention discloses a drug-coated prostate balloon dilatation catheter control system, relates to the technical field of medical instruments, and aims to solve the technical problems of uncontrollable drug release, extensive dilatation process and lack of quantitative evaluation in existing drug balloon therapy. The system integrates a high-precision pressure sensing module, a micro piezoelectric pump control module, a man-machine interaction module and a data processing module. The system carries out real-time closed-loop control on the internal pressure of the balloon through a self-adaptive PID algorithm, and precise execution of a preset pressure curve is achieved. The innovation of the method lies in that a drug release quantitative estimation model based on pressure-time integration (AUC) is created for the first time, the model can calculate and display the estimated drug release amount in the treatment process in real time, and physical operation parameters are directly associated with biological effects; the device has the effects of realizing accurate and constant control of the dilatation pressure and improving the operation safety.

The utility model relates to a high-flexibility five-sense-organ dilating catheter which comprises a three-way handle, a supporting tube, a developing mark, a catheter body, a supporting wire, a balloon and a front-end soft head. The rear end of the supporting tube is fixedly connected with the three-way handle, the catheter is arranged in the supporting tube in a penetrating mode, the front end of the catheter is fixedly connected with the near end of the balloon, and the rear end of the catheter extends into an inner cavity of the three-way handle and serves as a free end to move back and forth in the three-way handle. The supporting wire penetrates through the catheter, the rear end of the supporting wire extends into an inner cavity of the three-way handle and is fixedly connected with one cavity opening in the three-way handle in a sealed mode, and the front end of the supporting wire is fixedly connected with the far end of the balloon and the front-end soft head. And the developing marks are arranged on the supporting wires. According to the innovative structure, an independent supporting wire assembly is omitted, the supporting wire is directly embedded into the catheter, and the integrated design is achieved.

The present invention relates to a puncture needle assembly and a puncture system, wherein the puncture needle assembly comprises a needle seat and a needle body, wherein the needle seat has an axially through passage, wherein at least a portion of the side wall of the passage is configured as a conductor, and the proximal end of the needle body extends in the passage and is electrically connected to the conductor. The puncture system further comprises a dilator, wherein the dilator comprises an expansion catheter and an elastic conductive component that can be selectively arranged on the expansion catheter, and when the distal end of the needle body is hidden in the expansion catheter, it is electrically connected to external blood through the elastic conductive component or directly. The puncture needle assembly and the puncture system of the present invention have the advantages of being safe and convenient to use and having high reliability.

The utility model provides a kind of nipple cutting balloon dilatation catheter, comprising: the balloon part of being arranged in the front part of catheter, the tube wall of the balloon part is wrapped with balloon, the outer surface of the balloon is equipped with multiple knife filaments, and the knife filament is used to be connected with high frequency generator.The utility model can be sent into or pulled out duodenal nipple in the guide of guide wire, and dilate duodenal nipple, when nipple sphincter stenosis appears, handle joint connects high frequency generator, and the knife filament on the surface of balloon can carry out electroincision effect to the tissue of stenosis, increase stenosis dilatation efficiency and effect.

To provide a coating for an intraluminal expandable catheter providing contact transfer of drug micro-reservoirs.SOLUTION: A coating for an expandable portion of a catheter comprising a lipophilic matrix and a plurality of micro-reservoirs dispersed in the lipophilic matrix is disclosed. The plurality of micro-reservoirs comprises an active agent. A coating formulation and a method for forming the coating are also disclosed. A catheter comprising the coating on the expandable portion and a method for treating a condition are also provided.SELECTED DRAWING: Figure 1

The present invention discloses a balloon dilatation catheter, which belongs to the technical field of interventional treatment instruments, and comprises: a catheter; a balloon connected to the outer periphery of the distal end of the catheter, and having a fully filled state and a recovered folded state folded and wound around the circumference of the catheter; the balloon comprises an expansion portion and a connecting portion located at both axial ends of the expansion portion; an elastic support member located inside the balloon, and comprising a fixing ring fixed to the outer periphery of the catheter, and an elastic rod connected to the outer periphery of the fixing ring; the elastic rod has a bending elastic state of bending deformation around the circumference of the catheter; an elastic member fixed to the outside of the connecting portion and having an elastic stretching state of being stretched and deformed. When the balloon is depressurized and retracted, the balloon retracts and the multiple elastic rods form a plurality of folding wings, and the multiple folding wings form a winding state around the catheter under the action of the elastic force released by the multiple elastic members, so that the overall diameter of the balloon after contraction is smaller, which is conducive to withdrawing the balloon from the blood vessel and avoiding damage to the blood vessel during the withdrawal process of the balloon.

The present invention discloses a shock wave balloon dilation catheter comprising a balloon and a dilation catheter. The balloon includes a blood flow passage on its outer circumference and / or interior, extending axially and penetrating through the outer circumference and / or center. A shock wave generator is arranged within the balloon chamber, where conductive fluid can be introduced. The distal end of the dilation catheter passes through or into the balloon and is sealedly connected to the balloon. A fluid passage in the catheter communicates with the balloon chamber, and the shock wave generator is fixed to the portion of the catheter within the balloon. The dilation catheter is provided with a guide wire lumen. The present invention further discloses a shock wave balloon dilation catheter for tricuspid valve openings, which designed to avoid blood flow blockage and reduce the hemodynamic impact during the procedure, enhancing safety and treatment effectiveness.

The invention discloses a medicine balloon dilatation catheter which comprises a balloon and a support arranged outside the balloon, the support is in a net pipe shape and can dilate and contract along with the balloon, the dilatation diameter of the support is smaller than the dilatation diameter of the balloon during dilatation, and the dilatation catheter further comprises a medicine coating coated on the outer portion of the balloon. The drug coating comprises a plurality of magnetic drug particles; in a contraction state, the medicine particles are positioned between the balloon and the stent; in the expansion state, part of the sacculus swells out of the stent from the meshes of the stent to form a plurality of protruding parts, and the medicine particles are located on the protruding parts respectively. According to the drug balloon dilatation catheter, under the action of an in-vitro magnetic field, free drug particles generated in the dilatation process of the dilatation catheter can migrate to a vascular intima, meanwhile, the magnetic field can also prevent the drug particles squeezed into a blood vessel from being washed by blood to be separated from the blood vessel, and drug loss in the dilatation process can be reduced. And the stent is arranged outside the balloon, so that the medicine loss of the dilating catheter in the conveying process can be reduced.

The present invention relates to a cutting balloon dilatation catheter, comprising a balloon, a catheter, a cutting blade and a traction mechanism, wherein the cutting blade is connected to the balloon and has an outward opening, and the traction mechanism comprises a rotating tube with a distal end extending into the balloon and a flexible member that is windably arranged at the distal end of the rotating tube, the flexible member and the cutting blade being arranged in a one-to-one correspondence, one end of the flexible member being connected to the rotating tube, and the other end being connected to the inner wall of the balloon on the inner side of the cutting blade. The present invention can cause the balloon wall at the connection with the flexible member to deform and concave inward by the pulling action of the flexible member on the balloon, on the one hand pulling the cutting blade inward, thereby adjusting the exposed depth of the cutting blade; on the other hand, the deformation of the balloon wall squeezes the cutting blade, thereby adjusting the opening angle of the cutting blade. The pulling force of the flexible member can be controlled by rotating the rotating tube, thereby controlling the cutting depth and cutting range of the cutting blade, which is very convenient and has good cutting effect and safety.

The invention relates to the technical field of medical catheters, and particularly discloses a telescopic microneedle medicine balloon dilatation catheter which comprises a catheter assembly and a balloon body located at the far end of the catheter assembly and further comprises a plurality of microneedle puncture units located outside the balloon body. The microneedle puncture unit comprises a containing sleeve, a microneedle assembly and an elastic driving part, the top end and the bottom end of the containing sleeve are open, a plugging cover is arranged at the top end of the containing sleeve, a puncture seam is formed in the middle of the plugging cover, the microneedle assembly is slidably arranged in the containing sleeve in a sleeved mode, and the elastic driving part is connected to the opening in the bottom end of the containing sleeve. When the balloon body expands and is extruded by the outside, the elastic driving part is extruded to enable the elastic driving part to generate elastic deformation, and then the puncture end of the microneedle assembly is driven to penetrate through the puncture seam and be ejected and punctured out. And the microneedle easily breaks through the hard calcified shell and enters the hard calcified shell, so that the effective establishment of a drug delivery channel is ensured.

The invention provides a heart valve balloon dilatation catheter which is applied to the technical field of medical instruments and comprises a balloon, a protection net, a supporting net, an inner tube, an outer tube, a connecting structure and a head end structure. The protection net wraps the outer surface of the balloon, supporting legs are arranged on the protection net, the supporting net fixedly surrounds the outer surface of the protection net through the supporting legs, and a target interval is formed between the supporting net and the protection net; the first end of the balloon is fixedly connected with the head end structure, the second end of the balloon is fixedly connected with the first end of the outer tube, the second end of the outer tube is fixedly connected with the connecting structure, the inner tube extends and penetrates through the interior of the balloon, the first end of the inner tube is connected with the head end structure, the second end of the inner tube is fixedly connected with the connecting structure, and the outer tube wraps the outer surface of the inner tube. In the heart valve balloon dilatation catheter, the target interval can provide a blood flowing space, so that blood can smoothly pass through, the risks of ventricular fibrillation and sudden cardiac arrest are reduced, and the safety of cardiac surgery can be improved.