Coronary artery delivery catheter and delivery device for cardiac interventional therapy

Abstract

The present application discloses a coronary artery delivery catheter for cardiac interventional treatment, which relates to the technical field of medical devices; a guide wire is passed through an outer tube, a channel is defined between the outer tube and the guide wire, an interface is provided at the proximal end of the outer tube, and an inner tube is connected to the distal end of the outer tube; the catheter also includes an axial capsule component and a radial capsule component; the axial capsule component and the radial capsule component are fixedly connected to the outer circumferential surface of the inner tube and are connected to the channel, and the fluid enters the axial capsule component and the radial capsule component through the channel, so that the axial capsule component and the radial capsule component expand through elastic deformation, and at the same time, the pressure of the fluid entering the axial capsule component and the radial capsule component increases, and the axial size of the axial capsule component increases after the fluid enters, and the radial capsule component drives the axial size of the axial capsule component to increase through the increase of its own radial size after the fluid enters; the technical effect of being able to expand when the stenosis of the blood vessel is long and being able to expand around the stenosis of the blood vessel is better.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a coronary artery delivery catheter for cardiac interventional treatment. Background Art

[0002] During cardiac interventional surgery, when narrowing of blood vessels in the human body is discovered, a catheter balloon is usually used to mechanically expand the narrowed area. The balloon is made of elastic material and elastically deforms under the action of fluid pressure, thereby expanding. However, due to the elastic deformation ability of the elastic material, the expansion capacity of the balloon is limited because it cannot obtain a sufficient expanded size, and thus cannot achieve the effect of maximizing the expansion of the narrowed area of ​​the blood vessel.

[0003] The Chinese invention patent with patent number CN112426615B discloses a catheter balloon, in which the outer tube is sleeved on the outside of the core wire and defines a flow channel for fluid to pass through the core wire; the adjustment mechanism includes a fixed component and a movable component, the fixed component is attached to the distal end of the core wire, the fixed component is provided with a guide hole along the axial direction, and the movable component has a guide column for cooperating with the guide hole; the force-applying component is used to apply force to the movable component so that the guide column can slide toward the bottom of the guide hole; by reducing the distance between the two ends of the balloon during the balloon expansion process, the expansion amount of the balloon can be increased to a greater extent, thereby avoiding the use of increasing the radial size of the balloon in the free state to increase the expansion amount of the balloon.

[0004] This device increases the radial size of the balloon when it is expanded by shortening its axial size, and is only suitable for cases where the stenosis of the blood vessel is shorter. In addition, when using this device to expand the stenosis of the blood vessel, it can only expand the stenosis of the blood vessel and cannot expand the area around the stenosis of the blood vessel, resulting in poor expansion effect. Summary of the Invention

[0005] The present invention provides a coronary artery delivery catheter for cardiac interventional treatment, which solves the technical problem that the existing catheter balloon is only suitable for dilating a short vascular stenosis and cannot dilate the area around the vascular stenosis, resulting in poor dilation effect; and achieves the technical effect of being able to dilate a long vascular stenosis and dilate the area around the vascular stenosis, resulting in better dilation effect.

[0006] The present invention provides a coronary artery delivery catheter for cardiac interventional treatment, comprising an outer tube, a guide wire, a channel and an inner tube;

[0007] The guide wire is passed through an outer tube, and a channel with an annular cross section is defined between the outer tube and the guide wire. An interface for connecting to a fluid supply device is provided near the proximal end of the outer tube, and an inner tube is fixedly connected to the distal end of the outer tube, and the inner tube is elastic.

[0008] Also included are an axial capsule assembly and a radial capsule assembly;

[0009] The axial capsule assembly and the radial capsule assembly are fixedly connected to the outer circumferential surface of the inner tube, and the axial capsule assembly and the radial capsule assembly are communicated with the channel.

[0010] The fluid enters the axial capsule assembly and the radial capsule assembly through the channel, causing the axial capsule assembly and the radial capsule assembly to expand through elastic deformation, while the pressure of the fluid entering the axial capsule assembly and the radial capsule assembly increases.

[0011] The axial size of the axial capsule component increases after the fluid enters, and the radial size of the radial capsule component increases due to the increase in its own radial size after the fluid enters.

[0012] Furthermore, the number of the axial capsule components is 2, including an axial capsule body, a telescopic rod and a spring clip;

[0013] The axial balloon is a semi-compliant balloon;

[0014] The telescopic rod is fixedly connected to the two ends of the inner center of the inner tube. The telescopic rod remains in a contracted state when no fluid enters and extends after the fluid enters. The outer diameter of the telescopic rod is smaller than the inner diameter of the inner tube.

[0015] The spring clip is arranged at the proximal end of the telescopic rod, is pushed forward after the fluid enters the telescopic rod, and pops out after the telescopic rod is fully extended. The spring clip is used for sealing when the telescopic rod is not fully extended, and plays a fixing role after the telescopic rod is fully extended.

[0016] Furthermore, the number of the radial capsule components is three, including a radial capsule body, a fixing plate and a flow balancing tube;

[0017] The radial capsule is a semi-compliant balloon;

[0018] The fixing plate is a rubber sheet fixedly connected to the axial ends of the radial capsule, and expands and contracts upwards following the radial capsule after the fluid enters;

[0019] The flow balancing tube is an elastic tube fixedly connected to the top of the inner tube. An air inlet is provided at the distal connection between the flow balancing tube and the inner tube, and an exhaust port is provided at the connection between the flow balancing tube and the three radial capsule assemblies.

[0020] Furthermore, the spring card includes a base plate, a card plate and a spring;

[0021] The base plate is a circular plate that is slidably connected to the inside of the telescopic rod and is pushed after the fluid enters;

[0022] The card plate is a special-shaped plate with an arc-shaped top and a rectangular bottom. The card plate is mirror-mounted at the upper and lower ends of the base plate. When connected to the base plate, after the telescopic rod is fully extended, it pops out and is fixed to the card slot on the telescopic rod;

[0023] The spring is fixedly connected to the two ends of the bottom of the card plate. When the fluid enters, the spring pushes the card plate into the card slot on the telescopic rod under radial outward pressure. When the fluid is discharged, the spring pushes the card plate from the card slot on the telescopic rod back into the base plate under radial inward pressure.

[0024] Furthermore, the flow balancing tube also includes a flow balancing port, which is a grille arranged on the exhaust port of the flow balancing tube. The farther the flow balancing port is from the air inlet of the flow balancing tube, the larger the grille gap, and the pressure at the proximal flow balancing port is lower than the pressure at the distal flow balancing port.

[0025] Furthermore, the number of the axial capsule components is greater than or equal to 2, and the number of the radial capsule components is greater than or equal to 3. The number of the axial capsule components and the radial capsule components can be determined according to treatment needs.

[0026] Furthermore, it also includes a pressure equalizing component, which includes an inner bladder, an inner fluid, a flow guide tube, a support plate and a telescopic net;

[0027] The inner sac is a non-compliant air sac fixedly connected to the inside of the radial sac, and there is an internal fluid in the interlayer between the inner sac and the radial sac;

[0028] The internal fluid flows downward when subjected to a squeezing force outside the radial capsule assembly;

[0029] The guide tube is a telescopic airbag arranged in the middle below the inner bladder. When the fluid enters the radial bladder, the guide tube is connected to the internal fluid as the radial bladder rises. When the radial bladder assembly is squeezed, the internal fluid feeds the external pressure back to the guide tube through the flow of the fluid.

[0030] The support plate is an elastic airbag fixed in the middle of the telescopic net, and the support plate is connected to the guide pipe;

[0031] The telescopic net is an elastic grid net. The fluid entering the flow equalizing pipe can enter the radial capsule through the grid. The upper and lower ends of the telescopic net are respectively connected to the top of the flow equalizing port and the middle of the bottom of the inner airbag. The support plate after the fluid enters is supported in the middle.

[0032] Furthermore, the telescopic net is covered with stretching openings, which are diamond-shaped openings. The opening size of the telescopic openings changes accordingly according to the radial length of the telescopic net supported by the fluid.

[0033] Furthermore, the pressure exerted on the axial capsule assembly during expansion will also be transmitted to the adjacent radial capsule assembly.

[0034] One or more technical solutions provided in the present invention have at least the following technical effects or advantages:

[0035] The axial capsule assembly and the radial capsule assembly are fixedly connected to the outer circumferential surface of the inner tube, and the axial capsule assembly and the radial capsule assembly are communicated with the channel. The fluid supplied by the fluid supply device enters the axial capsule assembly and the radial capsule assembly through the channel, and causes the axial capsule assembly and the radial capsule assembly to expand through elastic deformation. At the same time, the pressure of the fluid entering the axial capsule assembly and the radial capsule assembly increases, and the axial size of the axial capsule assembly increases after the fluid enters. The radial capsule assembly drives the radial size of the axial capsule assembly to increase by increasing its own radial size after the fluid enters. The technical problem that the existing catheter balloon is only suitable for expanding a short vascular stenosis and cannot expand the area around the vascular stenosis, resulting in a poor expansion effect is solved; the technical effect of being able to expand a long vascular stenosis and expanding the area around the vascular stenosis is achieved, resulting in a better expansion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 This is a schematic structural diagram of the first expansion stage of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the second expansion stage of the present invention;

[0039] Figure 4 This is a schematic diagram of the spring clip structure of the present invention;

[0040] Figure 5 Schematic diagram of the flow balancing tube structure of the present invention;

[0041] Figure 6 This is a schematic structural diagram of the pressure equalizing assembly of the present invention;

[0042] Figure 7 This is a schematic diagram of the working state of the pressure equalizing component of the present invention;

[0043] Figure 8 For the present invention Figure 6 A partial enlarged schematic diagram;

[0044] Figure 9 For the present invention Figure 7 A partial enlarged schematic diagram;

[0045] Figure 10 It is a schematic diagram of the telescopic net structure of the present invention.

[0046] Reference numerals:

[0047] Blood vessel 10, stenosis area 11, calcification area 12,

[0048] Outer tube 100, guide wire 110, channel 120, inner tube 130,

[0049] Axial capsule assembly 200, axial capsule body 210, telescopic rod 220, spring clip 230, base plate 231, card plate 232, spring 233,

[0050] Radial capsule assembly 300, radial capsule body 310, fixing plate 320, flow averaging tube 330, flow averaging port 331,

[0051] Pressure equalizing assembly 400 , inner capsule 410 , inner fluid 420 , flow guide tube 430 , support plate 440 , telescopic net 450 , and stretching port 451 . DETAILED DESCRIPTION

[0052] To facilitate understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0053] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0055] See also Figures 1 to 3, which are schematic diagrams of the overall structure, the first expansion stage structure, and the second expansion stage structure of the present invention; the axial capsule assembly 200 and the radial capsule assembly 300 are fixedly connected to the outer circumferential surface of the inner tube 130, and the axial capsule assembly 200 and the radial capsule assembly 300 are in communication with the channel 120. The fluid supplied by the fluid supply device enters the axial capsule assembly 200 and the radial capsule assembly 300 through the channel 120, causing the axial capsule assembly 200 and the radial capsule assembly 300 to expand through elastic deformation. At the same time, the pressure of the fluid entering the axial capsule assembly 200 and the radial capsule assembly 300 increases. After the fluid enters, the axial size of the axial capsule assembly 200 increases, and after the fluid enters, the radial capsule assembly 300 drives the radial size of the axial capsule assembly 200 to increase by its own radial size increase. This solves the technical problem that existing catheter balloons are only suitable for dilating short vascular stenosis and cannot dilate the area around the stenosis, resulting in poor dilating effect. This solves the technical problem that existing catheter balloons are only suitable for dilating short vascular stenosis and cannot dilate the area around the stenosis, resulting in poor dilating effect. This solves the technical problem that existing catheter balloons are only suitable for dilating long vascular stenosis and can dilate the area around the stenosis, resulting in better dilating effect.

[0056] Example 1

[0057] In this embodiment, the distal end refers to the end extending into the human body, and the proximal end refers to the end located outside the human body.

[0058] like Figures 1 to 3 As shown, the coronary artery delivery catheter for cardiac interventional treatment of the present application includes an outer tube 100, a guide wire 110, a channel 120, an inner tube 130, an axial balloon assembly 200 and a radial balloon assembly 300;

[0059] The guide wire 110 passes through the outer tube 100, and a channel 120 with a ring-shaped cross-section is defined between the outer tube 100 and the guide wire 110. An interface for connecting to a fluid supply device (such as a syringe, a liquid pump, and a pressure pump) is provided near the proximal end of the outer tube 100, and an inner tube 130 is fixedly connected to the distal end of the outer tube 100, and the inner tube 130 is elastic.

[0060] The axial capsule assembly 200 and the radial capsule assembly 300 are fixedly connected to the outer circumferential surface of the inner tube 130, and the axial capsule assembly 200 and the radial capsule assembly 300 are communicated with the channel 120. The fluid supplied by the fluid supply device enters the axial capsule assembly 200 and the radial capsule assembly 300 through the channel 120, and causes the axial capsule assembly 200 and the radial capsule assembly 300 to expand through elastic deformation. At the same time, the pressure of the fluid entering the axial capsule assembly 200 and the radial capsule assembly 300 increases. The axial size of the axial capsule assembly 200 increases after the fluid enters, and the radial capsule assembly 300 drives the radial size of the axial capsule assembly 200 to increase through its own radial size increase after the fluid enters.

[0061] There are two axial capsule assemblies 200, each comprising an axial capsule body 210, a telescopic rod 220, and a spring clip 230, which are used to increase the axial size of the delivery catheter after the fluid enters.

[0062] The axial balloon 210 is a semi-compliant balloon with good stretchability and elasticity, and is used to expand the narrow area 11 by itself after the fluid enters;

[0063] The telescopic rod 220 is fixedly connected to the center ends of the inner tube 130. The telescopic rod 220 remains in a contracted state when no fluid enters, and extends after the fluid enters. The outer diameter of the telescopic rod 220 is smaller than the inner diameter of the inner tube 130, and is used to drive the axial size of the axial capsule 210 to increase after the fluid enters.

[0064] like Figure 4 As shown, the spring clip 230 is disposed at the proximal end of the telescopic rod 220. After the fluid enters the telescopic rod 220, the spring clip 230 is pushed forward and pops out after the telescopic rod 220 is fully extended. The spring clip 230 serves to seal the telescopic rod 220 when it is not fully extended, and serves to secure the telescopic rod 220 when it is fully extended. The spring clip 230 is used to deliver the fluid into the radial capsule assembly 300 after the telescopic rod 220 is fully extended, while preventing the telescopic rod 220 from retracting when the fluid in the radial capsule assembly 300 is not fully discharged.

[0065] The spring card 230 includes a base plate 231, a card plate 232 and a spring 233;

[0066] The base plate 231 is a circular plate that is slidably connected to the inside of the telescopic rod 220 and is pushed after the fluid enters to prevent the fluid from overflowing;

[0067] The card plate 232 is a special-shaped plate with an arc-shaped top and a rectangular bottom. The card plate 232 is mirror-mounted at the upper and lower ends of the base plate 231. When connected to the base plate 231, after the telescopic rod 220 is fully extended, the card plate 232 pops out and is fixed to the card slot on the telescopic rod 220.

[0068] The spring 233 is fixedly connected to the two ends of the bottom of the clamping plate 232. When the fluid enters, the spring pushes the clamping plate into the clamping groove on the telescopic rod 220 under the radial outward pressure. When the fluid is discharged, the spring pushes the clamping plate from the clamping groove on the telescopic rod 220 back into the base plate 231 under the radial inward pressure.

[0069] There are three radial capsule assemblies 300, each comprising a radial capsule body 310, a fixing plate 320, and a flow equalizing tube 330, which are used to increase the radial size of the axial capsule assembly 200 by increasing the radial size of the axial capsule assembly 200 after the fluid enters the assemblies.

[0070] The radial balloon 310 is a semi-compliant balloon with good stretchability and elasticity, and is used to increase the radial size of the delivery catheter after the fluid enters;

[0071] The fixing plate 320 is a rubber sheet fixedly connected to the axial ends of the radial capsule 310. After the fluid enters, it expands and contracts upward along with the radial capsule 310 to prevent the radial capsule 310 from expanding to both sides after the fluid enters.

[0072] like Figure 5 As shown, the flow balancing tube 330 is an elastic tube fixedly connected to the top of the inner tube 130. An air inlet is provided at the distal connection between the flow balancing tube 330 and the inner tube 130, and an exhaust port is provided at the connection between the flow balancing tube 330 and the three radial capsule assemblies 300, which is used to transport the fluid output from the axial capsule assembly 200 to the radial capsule assembly 300.

[0073] Furthermore, the flow balancing tube 330 also includes a flow balancing port 331, which is a grille arranged on the exhaust port of the flow balancing tube 330. The farther the flow balancing port 331 is from the air inlet of the flow balancing tube 330, the larger the grille gap. The pressure at the proximal flow balancing port 331 is less than the pressure at the distal flow balancing port 331, which is used to make the flow rate of the fluid entering different radial capsule assemblies 200 the same, thereby making the radial size of the radial capsule assembly 300 increase at a consistent rate.

[0074] Furthermore, the number of the axial capsule components 200 is greater than or equal to 2, and the number of the radial capsule components 300 is greater than or equal to 3. The number of the axial capsule components 200 and the radial capsule components 300 can be determined according to treatment needs.

[0075] Also included is a delivery device used in conjunction with the above-mentioned coronary artery delivery catheter, including a base, a guidewire clamping mechanism, and a guidewire moving mechanism;

[0076] The guide wire clamping mechanism and the guide wire moving mechanism are fixed on the base, and are respectively the guide wire clamping mechanism and the guide wire moving mechanism along the guide wire feeding direction;

[0077] The base is provided with an axial sliding groove;

[0078] The guidewire clamping mechanism includes a force sensor, which is fixed to the side of the guidewire clamping mechanism and in direct contact with the guidewire 110, and is used to clamp the guidewire 110 and simulate the twisting of the guidewire 110 by a human hand;

[0079] The guide wire moving mechanism includes a gear, a rack and a base, the gear is engaged with the rack, the base is located at one end of the rack, the gear is driven by a stepping motor, the gear rotates forward and backward, and drives the rack to move back and forth in a straight line;

[0080] The guidewire clamping mechanism pushes the guidewire forward through the guidewire moving mechanism. The guidewire moving mechanism is located in the slide groove of the base and can move axially along the slide groove to push the guidewire 110 forward into the blood vessel 100.

[0081] The working process of the coronary artery delivery catheter for cardiac interventional treatment in the embodiment of the present application is as follows:

[0082] 1. First, the device is delivered to the stenotic region 11 of the blood vessel 10 using the outer tube 100 and the guidewire 110. Then, a fluid supply device is used to inject fluid into the interior of the axial capsule assembly 200 and the radial capsule assembly 300 through the channel 120.

[0083] 2. The fluid enters the telescopic rod 220 of the axial capsule assembly 200 through the channel 120 and pushes the telescopic rod 220 forward, causing the axial dimension of the axial capsule assembly 200 to increase. When the telescopic rod 220 is fully extended, the spring 233 on the spring clamp 230, pushed by the radial outward force of the fluid, pushes the clamping plate 232 out and fixes it in the clamping groove on the telescopic rod 220, allowing the fluid to continue to move forward.

[0084] 3. The fluid enters the flow balancing tube 330 leading to the multiple radial capsule assemblies 300. The fluid enters the different radial capsule assemblies 300 at the same velocity through the different flow balancing ports 331 above the flow balancing tube 330, causing the radial dimensions of the different radial capsule assemblies 300 to increase at the same rate. The radial dimension increase of the radial capsule assemblies 300 drives the radial dimension increase of the axial capsule assemblies 200, thereby expanding the stenotic region 11 of the blood vessel.

[0085] 4. When the fluid supply device is pumping pressure, the radial capsule assembly 300 first retracts under the squeezing of the narrow area 11 of the blood vessel 10, and at the same time drives the axial capsule assembly 200 to return to its original radial size. The spring 233 on the spring clamp 230 pulls the clamping plate 232 back to its original position under the push of the radial inward force of the fluid, and then the telescopic rod 220 of the axial capsule assembly 200 retracts, driving the axial capsule assembly 200 to return to its original axial size, and finally driving the entire delivery catheter to retract to its original state.

[0086] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0087] The invention solves the technical problem that the existing catheter balloon is only suitable for dilating a short vascular stenosis and cannot dilate the area around the vascular stenosis, resulting in a poor dilation effect; and achieves the technical effect of being able to dilate a long vascular stenosis and dilate the area around the stenosis, resulting in a better dilation effect.

[0088] Example 2

[0089] During testing of the above embodiment, the following issues were discovered: Direct balloon dilation can be used for patients with only partial vascular stenosis. However, for patients with partial vascular stenosis and mild to moderate superficial calcification, the balloon's contact with the calcified layer can easily create a "dog bone" phenomenon during balloon dilation, significantly impacting the dilation effect.

[0090] In response to the above problems, Figures 6 to 9 As shown, this embodiment adds a pressure equalizing assembly 400 on the basis of the above embodiment, and the pressure equalizing assembly 400 includes an inner capsule 410, an inner fluid 420, a flow guide tube 430, a support plate 440 and a telescopic net 450;

[0091] The inner bladder 410 is a non-compliant airbag fixedly connected to the inside of the radial bladder 310. An inner fluid 420 is sandwiched between the inner bladder 410 and the radial bladder 310, which is used to increase the radial size of the radial bladder 310 after the fluid enters.

[0092] The internal fluid 420 flows downward when the radial capsule assembly 400 is subjected to an extrusion force, and is used to feed back the external pressure to the guide tube 430 through the flow of the fluid;

[0093] The guide tube 430 is a telescopic airbag located in the middle below the inner bladder 410. When the fluid enters the radial bladder 310 and the radial bladder 310 rises, the guide tube 430 communicates with the inner fluid 420. When the radial bladder assembly 300 is squeezed, the inner fluid 420 feeds the external pressure back to the guide tube 430 through the flow of the fluid.

[0094] The support plate 440 is an elastic airbag fixed in the middle of the telescopic net 450. The support plate 440 is connected to the guide tube 430 and is used to drive the telescopic net 450 to expand according to the flow rate of the internal fluid 420.

[0095] like Figure 10 As shown, the telescopic net 450 is an elastic grille net. The fluid entering the flow equalizing tube 330 can enter the radial capsule 310 through the grille. The upper and lower ends of the telescopic net 450 are respectively connected to the top of the flow equalizing port 331 and the middle of the bottom of the inner airbag 410. The support plate 440 is propped up in the middle after the fluid enters, and is used to make the radial dimensions of each radial capsule assembly 300 increase at the same speed under the drive of the telescopic net 450.

[0096] Furthermore, the telescopic net 450 is covered with stretching openings 451 . The stretching openings 451 are diamond-shaped openings. The opening size of the telescopic openings 451 changes accordingly according to the axial dimension of the telescopic net 450 supported by the fluid.

[0097] Furthermore, the pressure exerted on the axial capsule assembly 200 during expansion will also be transmitted to the adjacent radial capsule assembly 300 .

[0098] Only step 3 in the above embodiment is modified:

[0099] The fluid enters the flow balancing tube 330 that leads to the multiple radial capsule assemblies 300. The fluid flows through the different flow balancing ports 331 above the flow balancing tube 330, making the fluid flow velocity uniform across the different radial capsule assemblies 300. Portions of the axial capsule assemblies 200 and radial capsule assemblies 300 collide with the calcified area 12, increasing the pressure on the squeezed radial capsule 310. The fluid then flows into the radial capsule 310 with the lower pressure.

[0100] The internal fluid 420 enters the guide tube 430 under the pressure of the calcified area 12, and then enters the support plate 440 through the guide tube 430, and then expands the support plate 440. The smaller the pressure on the radial capsule 310, the less fluid enters the guide tube 430, the smaller the opening of the grid mesh 450, and the slower the increase in the speed of the fluid passing through. The greater the pressure on the radial capsule 310, the more fluid enters the guide tube 430, the larger the opening of the grid mesh 450, and the faster the increase in the speed of the fluid passing through.

[0101] The radial dimensions of the radial capsule components 300 subjected to different pressures increase at the same rate, thereby achieving uniform expansion of the stenotic and calcified areas 12 of the blood vessels, avoiding the "dog bone" phenomenon of larger ends and smaller middle, and ensuring the expansion effect.

[0102] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0103] By adding the pressure equalizing component 600, the radial dimensions of the radial capsule components 300 subjected to different pressures increase at the same rate, thereby achieving uniform expansion of the narrowed blood vessel and the calcified area 12, avoiding the "dog bone" phenomenon with large ends and a small middle, and ensuring the expansion effect.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coronary artery delivery catheter for cardiac interventional treatment, comprising an outer tube (100), a guide wire (110), a channel (120) and an inner tube (130); The guide wire (110) passes through the outer tube (100), and a channel (120) with a ring-shaped cross section is defined between the outer tube (100) and the guide wire (110). An interface for connecting to a fluid supply device is provided near the proximal end of the outer tube (100), and an inner tube (130) is fixedly connected to the distal end of the outer tube (100), and the inner tube (130) is elastic. It is characterized by: It also includes an axial capsule assembly (200) and a radial capsule assembly (300); the axial capsule assembly (200) includes an axial capsule body (210), a telescopic rod (220) and a spring clip (230); the radial capsule assembly (300) includes a radial capsule body (310), a fixing plate (320) and a flow balancing tube (330); The axial capsule assembly (200) and the radial capsule assembly (300) are fixedly connected to the outer circumferential surface of the inner tube (130), and the axial capsule assembly (200) and the radial capsule assembly (300) are in communication with the channel (120). The fluid enters the axial capsule assembly (200) and the radial capsule assembly (300) through the channel (120), causing the axial capsule assembly (200) and the radial capsule assembly (300) to expand through elastic deformation, while the pressure of the fluid entering the axial capsule assembly (200) and the radial capsule assembly (300) increases. The axial size of the axial capsule component (200) increases after the fluid enters, and the radial capsule component (300) drives the radial size of the axial capsule component (200) to increase through its own radial size increase after the fluid enters.

2. The coronary artery delivery catheter for cardiac interventional treatment according to claim 1, characterized in that: The number of the axial capsule components (200) is 2; The axial balloon (210) is a semi-compliant balloon; The telescopic rod (220) is fixedly connected to the two ends of the center of the inner tube (130). The telescopic rod (220) remains in a contracted state when no fluid enters, and extends after the fluid enters. The outer diameter of the telescopic rod (220) is smaller than the inner diameter of the inner tube (130). The spring clip (230) is arranged at the proximal end of the telescopic rod (220), is pushed forward after the fluid enters the telescopic rod (220), and pops out after the telescopic rod (220) is fully extended. The spring clip (230) is used for sealing when the telescopic rod (220) is not fully extended, and plays a fixing role after the telescopic rod (220) is fully extended.

3. The coronary artery delivery catheter for cardiac interventional treatment according to claim 1, characterized in that: The number of the radial capsule components (300) is 3; The radial capsule (310) is a semi-compliant balloon; The fixing plate (320) is a rubber sheet fixedly connected to the axial ends of the radial capsule (310), and expands and contracts upwards following the radial capsule (310) after the fluid enters; The flow balancing tube (330) is an elastic tube fixedly connected to the top of the inner tube (130), an air inlet is provided at the distal connection between the flow balancing tube (330) and the inner tube (130), and an exhaust port is provided at the connection between the flow balancing tube (330) and the three radial capsule assemblies (300).

4. The coronary artery delivery catheter for cardiac interventional therapy according to claim 2, wherein: The spring clamp (230) comprises a base plate (231), a clamping plate (232) and a spring (233); The base plate (231) is a circular plate, slidably connected to the inside of the telescopic rod (220), and is pushed after the fluid enters; The card plate (232) is a special-shaped plate with an arc-shaped top and a rectangular bottom. The card plate (232) is mirror-mounted at the upper and lower ends of the base plate (231). When connected to the base plate (231), after the telescopic rod (220) is fully extended, the card plate (232) pops out and is fixed to the card slot on the telescopic rod (220); The spring (233) is fixedly connected to the two ends of the bottom of the card plate (232). When the fluid enters, the card plate is pushed into the card slot on the telescopic rod (220) under radial outward pressure. When the fluid is discharged, the card plate is pushed back from the card slot on the telescopic rod (220) into the base plate (231) under radial inward pressure.

5. The coronary artery delivery catheter for cardiac interventional treatment according to claim 3, characterized in that: The flow balancing tube (330) further comprises a flow balancing port (331), wherein the flow balancing port (331) is a grille provided on the exhaust port of the flow balancing tube (330), and the farther the flow balancing port (331) is from the air inlet of the flow balancing tube (330), the larger the gap between the grilles, and the pressure at the proximal flow balancing port (331) is lower than the pressure at the distal flow balancing port (331).

6. The coronary artery delivery catheter for cardiac interventional treatment according to claim 1, characterized in that: The number of the axial capsule components (200) is greater than or equal to 2, and the number of the radial capsule components (300) is greater than or equal to 3. The number of the axial capsule components (200) and the radial capsule components (300) can be determined according to treatment needs.

7. The coronary artery delivery catheter for cardiac interventional treatment according to claim 1, characterized in that: It also includes a pressure equalizing assembly (400), the pressure equalizing assembly (400) including an inner capsule (410), an inner fluid (420), a flow guide tube (430), a support plate (440), and a telescopic net (450); The inner sac (410) is a non-compliant airbag, fixedly connected to the inside of the radial sac (310), and an inner fluid (420) is sandwiched between the inner sac and the radial sac (310); The inner fluid (420) flows downward when subjected to a squeezing force outside the radial capsule assembly (300); The guide tube (430) is a telescopic airbag arranged in the middle below the inner sac (410). When the fluid enters the radial sac (310), the guide tube (430) is connected to the inner fluid (420) as the radial sac (310) rises. When the radial sac assembly (300) is squeezed, the inner fluid (420) feeds the external pressure back to the guide tube (430) through the flow of the fluid. The support plate (440) is an elastic airbag fixed in the middle of the telescopic net (450), and the support plate (440) is in communication with the guide tube (430); The telescopic net (450) is an elastic grid net, and the fluid entering the flow equalizing tube (330) can enter the radial capsule (310) through the grid. The upper and lower ends of the telescopic net (450) are respectively connected to the top of the flow equalizing port (331) and the middle of the bottom of the inner capsule (410), and the support plate (440) is supported in the middle after the fluid enters.

8. The coronary artery delivery catheter for cardiac interventional treatment according to claim 7, characterized in that: The telescopic net (450) is covered with stretching openings (451), which are diamond-shaped openings. The opening size of the stretching openings (451) changes accordingly according to the radial length of the telescopic net (450) supported by the fluid.

9. The coronary artery delivery catheter for cardiac interventional treatment according to claim 1, characterized in that: The pressure applied to the axial capsule component (200) during expansion is also transmitted to the adjacent radial capsule component (300).

10. A coronary artery delivery device for cardiac interventional therapy, characterized in that: A coronary artery delivery catheter for cardiac interventional treatment according to any one of claims 1 to 6, further comprising a base, a guidewire clamping mechanism, and a guidewire moving mechanism; The guide wire clamping mechanism and the guide wire moving mechanism are fixed on the base, and are respectively the guide wire clamping mechanism and the guide wire moving mechanism along the guide wire feeding direction; The base is provided with an axial sliding groove; The guidewire clamping mechanism includes a force sensor, which is fixed to the side of the guidewire clamping mechanism and is in direct contact with the guidewire (110), and is used to clamp the guidewire (110) and simulate human hand twisting of the guidewire (110); The guide wire moving mechanism includes a gear, a rack and a base, the gear is engaged with the rack, the base is located at one end of the rack, the gear is driven by a stepping motor, the gear rotates forward and backward, and drives the rack to move back and forth in a straight line; The guide wire clamping mechanism pushes the guide wire forward through the guide wire moving mechanism. The guide wire moving mechanism is located in the slide groove of the base and can move axially along the slide groove to push the guide wire (110) forward and deep into the blood vessel (10).

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