251 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 present invention provides an expandable catheter and an expandable catheter sheath, wherein the expandable catheter includes a body, a connecting portion and a reinforcing portion; the expandable catheter switches between a contracted state and an expanded state along the circumferential direction; the body has an opening along the circumferential direction, the opening is continuously arranged along the axial direction, and the opening and closing of the opening corresponds to the state conversion of the expandable catheter; the connecting portion is connected to both sides of the opening; the reinforcing portion is continuously arranged in the body along at least a part of the circumference of the body, and the reinforcing portion does not overlap in the circumferential direction of the body. With such a configuration, the radial reinforcement of the body by the circumferentially non-closed reinforcing portion can effectively enhance the anti-bending and anti-compression capabilities of the expandable catheter without affecting the expansion performance of the body, achieving compliant bending in all directions, reducing the risk of bending due to excessive blood vessel curvature, and improving surgical safety.

The embodiment of the utility model provides an integral exchange type peripheral balloon dilatation catheter, and relates to the field of medical instruments. The overall exchange type peripheral balloon dilatation catheter comprises a protective sleeve, a balloon, a balloon woven layer, a fixing ring, a developing ring, a double-cavity tube, a catheter base sleeve and a catheter base. The overall exchange type balloon dilatation catheter is compact in structural design, and due to the special design of the balloon braid layer, the pressure resistance of the balloon is improved, and transverse breakage of the balloon can be avoided; and due to the design of the protective sleeve, the pushing performance of the balloon catheter can be improved, and the fish mouth effect is avoided.

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.

A dilation catheter system comprises a dilation catheter, a balloon and an outer catheter connected to the near end of the balloon. The micro catheter comprises an inner catheter section located in the inner cavity of the dilation catheter and a magnetic catheter section which is connected to the far end of the inner catheter section and extends out of the far end of the dilation catheter; the micro guide wire is arranged in conveying of the micro catheter in a penetrating mode, the micro guide wire is provided with a conductive coil and a set of wires electrically connected with the conductive coil, and the wires extend to the near end of the micro guide wire; and the electrifying device comprises a positive electrode output end and a negative electrode output end which are respectively connected with the wire. The conductive coil is electrified through the electrifying device, and the conductive coil generates a magnetic field to adsorb the magnetic tube section, so that the step effect is reduced, and the performance of the dilation catheter system penetrating through a narrow part is improved; after the stent reaches the target position, the power supply is cut off, and the magnetic tube section restores the original size to normally convey and release the stent; medical instruments do not need to be replaced for many times, convenience is improved, and surgical risks are reduced.

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 balloon dilatation catheter comprises a balloon, an inner tube, an outer tube, a liquid guide component and a supporting assembly, the inner tube is sleeved with the liquid guide component, the near end of the liquid guide component is connected to the outer tube and / or a near-end tube pin of the balloon, an air storage channel is formed between the near end of the liquid guide component and the near-end tube pin, and the far end of the liquid guide component extends into the far end of the balloon and forms a liquid guide cavity between the far end of the liquid guide component and the inner tube; the supporting assembly comprises a first supporting component which is arranged between the liquid guiding component and the inner pipe and allows the filling liquid to pass through. By arranging the liquid guide component, the filling liquid flows into the balloon from the far end of the balloon, the situation that far-end development is affected due to the fact that air gathers at the far end of the balloon is avoided, meanwhile, the air storage channel is arranged at the near end of the balloon, air driving the near end of the balloon is gathered in the air storage channel, and near-end development is not affected; in addition, through the design of the groove of the inner tube and the supporting assembly, the filling liquid in the balloon can be smoothly pumped back, back holding of the balloon is facilitated, and the balloon is conveniently taken out.

The invention discloses a manufacturing method of a balloon dilatation catheter and the balloon dilatation catheter, and the manufacturing method of the balloon dilatation catheter comprises the following steps: expanding one end of the catheter to form an expansion part; the near end of the balloon is arranged in the expansion part; and heating the outer periphery of the dilation part so that the dilation part is connected with the balloon in the dilation part. According to the embodiment of the invention, the catheter which is positioned on the outer part and has a relatively thick wall is firstly melted, and then the balloon which is positioned on the inner part and has a relatively thin wall is melted, so that the balloon can be connected with the catheter after being slightly melted, and the attenuation of the thickness and the performance of the balloon due to the influence of excessive radiation of heat is avoided; the use stability of the balloon is improved, and the blasting risk of the balloon in the use process is reduced.

The invention relates to a medicine balloon dilatation catheter and a using method thereof.The medicine balloon dilatation catheter comprises an inner tube, an outer tube, a balloon, medicine patches and a supporting mechanism, the supporting mechanism comprises a supporting piece and a push-pull piece which have an initial state and a supporting state, the supporting piece is provided with a plurality of supporting parts which are arranged corresponding to the medicine patches and located in the balloon, and the push-pull piece is arranged on the outer tube; when the supporting piece is in an initial state, the supporting part is straightened and is not in contact with the balloon; when the supporting piece is in the supporting state, the supporting part arches outwards and can jack up the medicine patch corresponding to the supporting part outwards. The supporting part on the supporting mechanism arches outwards and jacks up the medicine patch, on one hand, the medicine patch can be attached to the lesion blood vessel wall in advance, so that medicine is released in advance, and inflammation caused by blood vessel opening is relieved; on the other hand, part of the balloon wall is anchored on the blood vessel wall, so that the balloon is prevented from shifting in the expansion process, and the stability is better.

The invention discloses a balloon dilatation catheter and a blood vessel dilatation device. The balloon dilatation catheter comprises an inner tube, an outer tube, a catheter base and a balloon, and a guide wire is arranged in the inner tube in a penetrating mode; the outer pipe is sleeved on the inner pipe; a first inlet and a second inlet are formed in the guide pipe seat, the first inlet is communicated with the inner pipe, and the second inlet is communicated with the outer pipe; the multiple balloons are sequentially arranged on the inner tube in a sleeving mode, and the interiors of the balloons are communicated with the outer tube. First grooves are uniformly distributed in the side surface of the balloon; when the balloon dilatation catheter is used, media are introduced into the balloons through the second connectors to enable the balloons to be filled and expanded, the flat portions, adjacent to the first grooves, of the balloons form occipital portions, the adjacent balloons make contact with each other to form the second grooves, the occipital portions can exert pressure on diseased regions to conduct dilatation, and therefore the diseased regions can be dilated. The first grooves and the second grooves which are evenly distributed can buffer stress borne by the released blood vessel during expansion, blood vessel injuries and interlayers are reduced, and meanwhile the treatment safety of a patient is guaranteed.

The utility model belongs to the field of medical instruments, and particularly relates to a balloon dilatation catheter which comprises a first catheter body, a balloon body is installed at one end of the outer surface of the first catheter body, side grooves are formed in the two sides of the interior of the first catheter body, positioning assemblies are installed on the inner walls of the side grooves, inner tubes are installed on the side walls of the positioning assemblies, and the inner tubes are connected with the balloon body. The end of the inner pipe is sleeved with a one-way pipe, through holes are formed in the two sides of the one-way pipe, the outer surface of one end of the one-way pipe is sleeved with a sliding sleeve, and in the natural state, the through holes are located in the sliding sleeve. Through mutual cooperation of the inner tube, the one-way tube, the fixing assembly, the miniature springs and other structures, a gas-liquid mixture of air and a contrast agent can be conveyed to the balloon body to support the balloon body, and after conveying of the gas and the contrast agent is stopped, the two miniature springs can rebound rapidly, so that the one-way tube and the through hole are blocked by the sliding sleeve, and the balloon body is supported by the sliding sleeve. Consequently, the contrast agent can be prevented from flowing back, and the contrast result is prevented from being

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 present invention generally relates to expandable catheters for use in electrophysiology, and more specifically to high-density balloon catheters for use in diagnosing and / or treating cardiac arrhythmias. A catheter includes an elongate catheter shaft comprising a proximal end and a distal end. The elongate catheter shaft defines a longitudinal axis. The catheter includes an expandable assembly having a first delivery configuration and a second deployed configuration. The balloon member includes at least one flexible framework disposed between an outer facing layer and an inner facing layer of the top surface and / or the bottom surface of the balloon member and at least one plurality of electrodes patterned onto the flexible framework. In some embodiments, a flat balloon member includes electrodes on both sides of the planar balloon member. The balloon member may include a flexible structural element disposed within the interior cavity.

The invention provides a balloon dilatation catheter, relates to the technical field of medical instruments, and aims to solve the problem that a left ventricular outflow tract is completely blocked in a heart valve balloon dilatation process in related technologies. The balloon dilatation catheter comprises a catheter body and a balloon assembly, the balloon assembly comprises a first balloon and at least two second balloons, the first balloon comprises a cylindrical dilatation part, the cross section of each second balloon is in an arc shape, the at least two second balloons are arranged around the dilatation part at intervals, the second balloons cover the outer surface of the dilatation part in a surrounding mode, and the first balloon and the second balloon are arranged in an arc shape. The second balloon is communicated with the first balloon, one end of the catheter is connected with one end of the first balloon, and the catheter is communicated with the interior of the first balloon; under the condition that the balloon assembly is in an expansion state, the surfaces of the sides, back to the first balloon, of the at least two second balloons are located in the same cylindrical surface, and in the at least two second balloons, a flow channel is formed between any two adjacent second balloons.

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 belongs to the technical field of balloon dilatation catheters, and discloses a visual Eustachian tube balloon dilatation catheter which comprises a guide part, a catheter part, a visual part and a control part. The guide pipeline is provided with a bent part extending out from the first end of the guide component; the catheter component is located in the guiding pipeline of the guiding component and can move along the guiding pipeline to enter the lesion position or move out of the lesion position. The visual part is positioned in the visual pipeline of the guide part; the control component is connected with the second end of the catheter component and provided with a first extension pipeline and a second extension pipeline which are in butt joint with the guiding pipeline and the visual pipeline in a matched mode. The visual part and the catheter part are integrated on the guide part, so that the position of the catheter part can be observed in real time through the visual part during an operation, the catheter part can enter a lesion position conveniently, and operation steps are simplified.

A catheter system includes a balloon dilation catheter having a proximal end portion and a distal end portion. The balloon dilation catheter includes a dilation balloon lumen that is configured to couple with a first fluid supply. An expandable dilation balloon is fluidly connected to the dilation balloon lumen. The expandable dilation balloon is configured to transition between an inflated state and a non-inflated state. An expandable stop element is configured to selectively transition among a range of expanded states including a non-expanded state, a first expanded state, and a second expanded state. The expandable stop element defines an outer diameter such that the outer diameter defines a minimum diameter when the expandable stop element is in the non-expanded state and a maximum diameter when the expandable stop element is in the second expanded state.

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.