Disclosure of Invention
The invention aims to provide a catheter with a head end protection component, which is used for coating the head end of the catheter in the process of pushing the catheter so as to solve the problem that the catheter is easy to clamp on the wall of a blood vessel at a bifurcation.
In order to achieve the above object, the present invention provides the following technical solutions:
An aspiration catheter for interventional procedures, comprising a catheter body and a protective assembly;
the protection component comprises a control wire penetrating through the catheter main body and a protection head arranged at the distal end of the control wire;
The protective head is made of silica gel, a protruding part protruding towards the proximal end is arranged on the periphery of the proximal end of the protective head, and the protruding part is used for coating the side wall of the distal end of the catheter main body;
The control wire and the middle part of the protection head are jointly provided with a cavity for the guide wire to pass through;
the protective sheath is positioned distally of the catheter body during forward delivery of the catheter body along the blood vessel.
Preferably, the wall thickness of the projection tapers from the distal end to the proximal end.
Preferably, the protecting head is provided with a plurality of communicating cavities communicated with the inside of the catheter main body, and the protecting head is provided with a supporting tube positioned in the communicating cavities.
Preferably, the outer ring of the protruding part is sleeved with a converging ring.
Preferably, the converging ring is a ring made of nickel-titanium alloy wires, and in a natural state, the diameter of the converging ring is smaller than that of the catheter main body.
Preferably, the distal end of the protective head is arranged in an arc shape.
Preferably, the catheter further comprises a detachable synchronization assembly, wherein the detachable synchronization assembly is used for keeping the catheter main body and the control wire in synchronization, and the detachable synchronization assembly can move relatively after the connection is released.
Preferably, the detachable synchronization assembly comprises an internal thread arranged at the proximal end of the inner wall of the catheter main body, and an external thread arranged at the proximal end of the outer wall of the control wire, wherein the external thread is matched with the internal thread.
Preferably, the detachable synchronization assembly comprises a friction member provided at a proximal end gap of the catheter body and the control wire, and the friction member synchronizes the catheter body and the control wire through friction resistance.
Preferably, the distal side wall of the catheter body is provided with a recess, and the catheter body is provided with a developing ring positioned on the recess.
The beneficial effects are that:
(1) According to the invention, the distal opening of the catheter body is covered by the protective head, so that the catheter body is prevented from being blocked at the wall of the bifurcated blood vessel when passing through the bifurcated blood vessel, the blood vessel can be effectively protected, and the damage to the blood vessel is reduced;
(2) The invention controls the protecting head by arranging the control wire, adopts a mode of pushing forward to release connection and pulling backward to withdraw the protecting head from the catheter main body, so that the withdrawing of the protecting head is convenient and stable;
(3) The invention is provided with the converging ring which is made of elastic material, and can apply force to the convex part along the radial direction to the middle part in the natural state to assist the convex part to shrink, so that the convex part which is disconnected with the far end of the catheter main body can be conveniently retracted into the catheter main body, thereby being convenient for recovering the protecting head.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may explicitly or implicitly include one or more features.
In the description of the present invention, unless explicitly specified and limited otherwise, the term "connected" shall be construed broadly, and may be, for example, fixedly connected or movably connected, detachably connected or non-detachably connected, integrally connected, mechanically connected or electrically connected or communicable with each other, directly connected or indirectly connected through intermediaries, or in communication with each other, or in an interaction relationship between two elements.
In the description of the present invention, "distal" refers to the end farther from the surgeon during surgery and "proximal" refers to the end closer to the surgeon during surgery.
In the description of the present invention, "before use" refers to a state in which the aspiration catheter for interventional operation is not used, is not entered into the human body, or is not in contact with the body fluid such as blood, tissue fluid, etc., and "during use" refers to a state in which the aspiration catheter for interventional operation has been entered into the human body or is in contact with the body fluid such as blood, tissue fluid, etc.
In the description of the present invention, the "in vivo environment" refers to an environment under the epidermis of the skin in which body fluids exist, such as dermis and subcutaneous tissue, or blood vessels, the inside of organs, and the like.
The present invention will be described in detail with reference to examples. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention aims at the problems that in the prior art, in the process of pushing the suction catheter, the head end of the suction catheter is easy to be clamped on the vascular wall at the bifurcation, so that the vascular spasm is caused and even the vascular is broken due to the fact that a larger gap exists between the head end of the suction catheter and a guide wire.
The invention provides an aspiration catheter for interventional procedures, as shown in fig. 1 to 4, comprising a catheter body 1 and a protective assembly;
The protection component comprises a control wire 2 penetrating through the catheter main body 1, and a protection head 3 arranged at the distal end of the control wire 2;
The protecting head 3 is made of silica gel, and the periphery of the proximal end of the protecting head 3 is provided with a bulge 31 protruding towards the proximal end for coating the side wall of the distal end of the catheter main body 1;
the control wire 2 and the middle part of the protection head 3 are jointly provided with a cavity 4 for the guide wire to pass through;
The protective head 3 is fitted over the distal end of the catheter body 1 during the forward delivery of the catheter body 1 along the blood vessel.
The catheter main body 1 is preferably made of PTFE material, has good biocompatibility and has certain strength. The control wire 2 is preferably made of stainless steel, so that the strength of the control wire 2 is high, the tolerance to human environment is high, and the control stability is ensured.
The middle part of the catheter main body 1 is provided with a cavity penetrating along the length direction of the catheter main body, and the cross section of the cavity is preferably round, or triangular, square or other shapes with central symmetry. The control wire 2 passes through the cavity and is slidable along the cavity.
The protective head 3 is made of silica gel, so that the influence on the intravascular environment is low, the protective head 3 is soft, and the protective head 3 can be slightly deformed by extrusion when contacting the blood vessel wall at the bifurcation, so that the damage to the blood vessel wall at the bifurcation is reduced. At the same time, the protective head 3 can block the space between the guide wire and the catheter body 1 to prevent the catheter body 1 from getting stuck on the vessel wall at the bifurcation. The proximal end periphery of the protective head 3 is provided with a protruding part 31 protruding towards the proximal end, and the protruding part 31 and the protective head 3 are of an integral structure. The distal end of the protecting head 3 is mushroom umbrella-shaped and is used for plugging the distal end of the catheter main body 1.
It should be noted that the protecting head 3 is deformable under force, has a certain elasticity, and in a state of being naturally free from external force, the diameter of the protruding portion 31 is smaller than the inner diameter of the catheter main body 1. The protrusion 31 naturally contracts after being separated from the catheter main body 1, so that the proximal end diameter of the protecting head 3 becomes smaller and can pass through the cavity of the catheter main body 1.
The middle part of the protective head 3 is adhered and fixed with the control wire 2, and the protective head 3 can be controlled to move towards the proximal end or the distal end in the process of pushing and pulling the control wire 2.
The cavity 4 that supplies the seal wire to pass has been offered at the middle part of control silk 2, and the cavity 4 that supplies the seal wire to pass has also been offered at the middle part of protection head 3, and two cavities 4 intercommunication, seal wire can pass control silk 2 and protection head 3 in proper order. The guide wire is used for guiding the catheter main body 1, so that the conveying difficulty is reduced.
As shown in fig. 1 to 5, before use, the protrusion 31 is pulled radially outward and sleeved on the distal end of the catheter body 1, and the protective head 3 seals the distal opening of the catheter body 1. The catheter body 1 is then pushed distally along the guide wire, and the protective head 3 is brought into contact with the vessel wall at the bifurcation while passing through the vessel wall at the bifurcation, while the distal end of the catheter body 1 is covered by the protective head 3 without coming into contact with the vessel wall, thereby achieving the effect of preventing the catheter body 1 from being stuck to the vessel wall at the bifurcation. Meanwhile, the protection head 3 is softer, so that the damage to the vessel wall at the bifurcation can be effectively reduced.
After the proximal end of the thrombus is reached, the catheter main body 1 and the control wire 2 are retracted by 40-50mm, then the control wire 2 is pushed to the distal end, the control wire 2 applies a distal force to the middle part of the protection head 3, so that the bulge 31 and the distal side wall of the catheter main body 1 slide relatively, the bulge 31 is separated from the catheter main body 1 and contracts radially and is attached to the control wire 2, at the moment, the control wire 2 is pulled to the proximal end, the bulge 31 and the protection head 3 enter the cavity of the catheter main body 1 together, and the control wire 2 is pulled to the proximal end continuously to take out the control wire 2 and the protection head 3. At this time, the forward deriving tube main body 1 brings the distal end of the catheter main body 1 close to the thrombus, and the in-place work of the catheter main body is completed. Through setting up protection head 3 and covering the distal end opening of pipe main part 1, avoided pipe main part 1 card at the branch vessel wall when passing through branch vessel, solved "windowsill effect", can effectively protect the vessel, reduce the injury to the vessel. The control wire 2 is adopted to withdraw the protection head 3, so that the withdrawal of the protection head 3 is convenient and stable, and the protection head 3 is prevented from influencing the follow-up operation of the catheter main body 1.
In the preferred embodiment of the present invention, the wall thickness of the projection 31 tapers from the distal end to the proximal end. After being pushed out by the control wire 2 and the bulge 31 is disconnected with the distal end of the catheter main body 1, the bulge 31 contracts to form a state with a thinner proximal end, so that the catheter main body 1 is conveniently retracted.
In the preferred embodiment of the present invention, the protecting head 3 is provided with a plurality of communicating cavities 32 communicated with the inside of the catheter main body 1, and the protecting head 3 is provided with a supporting tube 33 positioned in the communicating cavities 32. The support tube 33 is made of PTFE and has a certain hardness to ensure that the communication chamber 32 is not closed by extrusion deformation when deformed. By providing the communication chamber 32, the interior of the catheter main body 1 and the interior of the blood vessel can be communicated, and the possibility that the catheter main body 1 is deformed by the pressure in the blood vessel can be reduced. Meanwhile, blood can flow out through the communication cavity 32, and when the blood does not flow out, the distal end of the catheter main body 1 can be assisted to judge that the distal end is positioned at the thrombus, thereby playing an auxiliary judging role. In the process of recovering the protecting head 3, the proximal end of the communicating cavity 32 may be blocked by the protruding portion 31, and after blocking, blood flow cannot flow out of the communicating cavity 32, so that the blood flow loss is automatically reduced.
In the preferred embodiment of the present invention, the outer ring of the protrusion 31 is sleeved with a converging ring 34. The constriction ring 34 is made of an elastic material, and in a natural state, the constriction ring 34 applies a force to the protruding portion 31 in the radial direction toward the middle, so that the protruding portion 31 is assisted to contract, and the protruding portion 31 is conveniently retracted into the catheter main body 1, so that the protection head 3 is conveniently recovered. The converging ring 34 is pulled radially during the installation process and is sleeved outside the protruding part 31, so as to perform the converging function on the protruding part 31.
In the preferred embodiment of the present invention, the converging ring 34 is a ring made of nitinol wires, and in its natural state, the diameter of the converging ring 34 is smaller than the diameter of the catheter body 1. The natural state herein refers to a state in which the convergence ring 34 is not disturbed by an external force.
In a preferred embodiment of the invention, the distal end of the protective head 3 is arranged in an arc shape. The far end of the arc-shaped protecting head 3 is smoother, and the extrusion force on the inner wall of the blood vessel can be effectively reduced, so that the damage to the blood vessel is reduced.
In the preferred embodiment of the present invention, the detachable synchronization assembly 5 is further included, and the detachable synchronization assembly 5 is used for keeping the catheter body 1 and the control wire 2 in synchronization, and the detachable synchronization assembly 5 can relatively move the catheter body 1 and the control wire 2 after the connection is released.
In a preferred embodiment of the present invention, the detachable synchronization module 5 includes an internal thread provided at the proximal end of the inner wall of the catheter body 1, and an external thread provided at the proximal end of the outer wall of the control wire 2, and the external thread is adapted to the internal thread. Through setting up threaded connection, the relative motion of catheter body 1 and control silk 2 is realized to rotatory control silk 2, simultaneously, rotates certain length and releases threaded connection back, and catheter body 1 and control silk 2 still can continue to do relative motion. It should be noted that the locations of the internal and external threads are located outside the patient.
In a preferred embodiment of the invention, the detachable synchronization module 5 comprises a friction member provided at the proximal end gap of the catheter body 1 and the control wire 2, which synchronizes the catheter body 1 and the control wire 2 by friction resistance. The friction piece is cylindrical with one end open, is inserted into the gap between the catheter main body 1 and the control wire 2 and is respectively abutted with the catheter main body 1 and the control wire 2. The friction piece can be made of rubber materials, the catheter main body 1 and the control wire 2 are synchronous through friction force after insertion, when the friction piece is required to be removed, the friction piece is directly pulled out, the friction piece is convenient to assemble and disassemble, and a doctor can conveniently control whether the catheter main body 1 and the control wire 2 are synchronous or not.
In the preferred embodiment of the present invention, the distal side wall of the catheter body 1 is provided with a recess 11, and the catheter body 1 is provided with a developing ring 12 on the recess 11. The concave part 11 is a groove which is sunken in the middle part along the radial direction, and the developing ring 12 is arranged and welded on the concave part 11, so that the diameter of the developing part is set to be the same as the diameter of other parts of the catheter main body 1, and the influence of the developing part on the trafficability is reduced. The developing ring 12 may be one of nickel titanium alloy and platinum iridium alloy, and the position of the developing ring 12 may be displayed under DSA equipment to assist a doctor in judging the position of the distal end of the catheter body 1.
In the preferred embodiment of the present invention, a hydrophilic coating is disposed on the inner wall of the cavity of the catheter body 1, more specifically, the hydrophilic coating is a hydrogel coating, and a water film can be formed on the surface, so as to reduce the surface friction force and facilitate the sliding of the control wire 2.
An aspiration catheter for interventional procedures according to the present invention will be described in detail by way of specific examples.
Example 1
The present embodiment provides an aspiration catheter for interventional procedures, as shown in fig. 1 to 4, comprising a catheter body 1 and a protective assembly;
The middle part of the catheter main body 1 is provided with a cavity penetrating along the length direction of the catheter main body. The side wall of the cavity is provided with a hydrophilic coating for reducing the surface friction of the side wall of the cavity.
The protection component comprises a control wire 2 penetrating through the cavity of the catheter main body 1, and a protection head 3 is bonded at the distal end of the control wire 2;
The protecting head 3 is made of silica gel, has softer texture and certain elasticity, and has less damage to the vessel wall in the blood vessel. The periphery of the proximal end of the protecting head 3 is integrally formed with a protruding part 31, the protruding part 31 protrudes towards the proximal end, and the protruding part 31 is used for coating the side wall of the distal end of the catheter main body 1;
the control wire 2 and the middle part of the protection head 3 are jointly provided with a cavity 4 for the guide wire to pass through;
The protective head 3 is fitted over the distal end of the catheter body 1 during the forward delivery of the catheter body 1 along the blood vessel. Before use, the protective head 3 is first sleeved on the distal end of the catheter body 1, and the proximal end of the guide wire passes through the protective head 3 and the catheter body 1.
The catheter main body 1 is preferably made of PTFE material, has good biocompatibility and has certain strength. The control wire 2 is preferably made of stainless steel, so that the strength of the control wire 2 is high, the tolerance to human environment is high, and the control stability is ensured.
The protecting head 3 is provided with a plurality of communicating cavities 32 communicated with the inside of the catheter main body 1, the protecting head 3 is provided with supporting tubes 33 positioned in the communicating cavities 32, and the supporting tubes 33 are preferably made of PTFE material and have certain hardness for preventing the communicating cavities 32 from being blocked. By providing the communication chamber 32, the interior of the catheter main body 1 and the interior of the blood vessel can be communicated, and the possibility that the catheter main body 1 is deformed by the pressure in the blood vessel can be reduced. Blood can flow out through the communication cavity 32, and when the blood does not flow out, the distal end of the catheter main body 1 can be assisted to judge that the distal end is positioned at the thrombus, thereby playing an auxiliary judging role.
In this embodiment, the distal end of the protection head 3 is provided in an arc shape. The far end of the arc-shaped protecting head 3 is smoother, and the extrusion force on the inner wall of the blood vessel can be effectively reduced, so that the damage to the blood vessel is reduced.
The detachable synchronization assembly 5 is used for keeping the catheter main body 1 and the control wire 2 in synchronization, and the detachable synchronization assembly 5 can move relatively to the catheter main body 1 and the control wire 2 after the connection is released.
The detachable synchronization assembly 5 comprises an internal thread arranged at the proximal end of the inner wall of the catheter main body 1, an external thread arranged at the proximal end of the outer wall of the control wire 2, and the external thread is matched with the internal thread. Through setting up threaded connection, the relative motion of catheter body 1 and control silk 2 is realized to rotatory control silk 2, simultaneously, rotates certain length and releases threaded connection back, and catheter body 1 and control silk 2 still can continue to do relative motion. It should be noted that the locations of the internal and external threads are located outside the patient.
The distal side wall of the catheter body 1 is provided with a recess 11, and the catheter body 1 is provided with a developing ring 12 located on the recess 11. The concave part 11 is a groove which is sunken in the middle part along the radial direction, and the developing ring 12 is arranged and welded on the concave part 11, so that the diameter of the developing part is set to be the same as the diameter of other parts of the catheter main body 1, and the influence of the developing part on the trafficability is reduced. The developing ring 12 may be one of nickel titanium alloy and platinum iridium alloy, and the position of the developing ring 12 may be displayed under DSA equipment to assist a doctor in judging the position of the distal end of the catheter body 1.
Before use, as shown in fig. 1 to 5, the protrusion 31 is pulled radially outward and sleeved on the distal end of the catheter body 1, and the protective head 3 seals the distal opening of the catheter body 1. The catheter body 1 is then pushed distally along the guide wire, and the protective head 3 is brought into contact with the vessel wall at the bifurcation while passing through the vessel wall at the bifurcation, while the distal end of the catheter body 1 is covered by the protective head 3 without coming into contact with the vessel wall, thereby achieving the effect of preventing the catheter body 1 from being stuck to the vessel wall at the bifurcation. Meanwhile, the protection head 3 is softer, so that the damage to the vessel wall at the bifurcation can be effectively reduced.
After the proximal end of thrombus is reached, the catheter main body 1 and the control wire 2 are retracted by 40-50mm, then the control wire 2 is rotated to release synchronization with the catheter main body, the control wire 2 is pushed to the distal end, the control wire 2 applies a force to the middle part of the protection head 3 to enable the bulge 31 and the distal side wall of the catheter main body 1 to slide relatively, the bulge 31 is separated from the catheter main body 1 and then contracts radially and is attached to the control wire 2, at the moment, the control wire 2 is pulled to the proximal end, the bulge 31 and the protection head 3 enter the cavity of the catheter main body 1 together, the control wire 2 is pulled to the proximal end continuously, the control wire 2 is rotated when the control wire 2 is continuously rotated to release the threaded connection, and the control wire 2 and the protection head 3 are pulled continuously to be taken out. The forward deriving tube body 1 brings the distal end of the catheter body 1 close to the thrombus, and the in-place work of the catheter body is completed. Through setting up protection head 3 and covering the distal end opening of pipe main part 1, avoided pipe main part 1 card at the branch vessel wall when passing through branch vessel, solved "windowsill effect", can effectively protect the vessel, reduce the injury to the vessel. The control wire 2 is adopted to withdraw the protection head 3, so that the withdrawal of the protection head 3 is convenient and stable, and the protection head 3 is prevented from influencing the follow-up operation of the catheter main body 1.
Example 2
This embodiment further illustrates the protrusion 31 on the basis of embodiment 1, wherein the wall thickness of the protrusion 31 gradually decreases from the distal end to the proximal end.
The outer side wall of the protruding part 31 is sleeved with a converging ring 34. The constriction ring 34 is made of nickel-titanium alloy, has certain elasticity, and the diameter of the constriction ring 34 in a natural state is smaller than that of the cavity of the catheter main body 1, and the constriction ring 34 applies force to the protruding part 31 in the radial direction to the middle part, so that the protruding part 31 separated from the catheter main body 1 is promoted to shrink, the protruding part 31 is conveniently retracted into the catheter main body 1, and the protection head 3 is conveniently retracted. Meanwhile, the nickel-titanium alloy has better developability, and the position of the converging ring 34 can be clearly judged under DSA equipment. In use, the positional relationship between the converging ring 34 and the developing ring 12 is determined to assist in determining whether the protruding portion 31 is separated from the catheter main body 1. Specifically, when the control wire 2 pushes the protective sleeve, the converging ring 34 moves relative to the developing ring 12, and after the converging ring 34 passes through the developing ring 12, the protrusion 31 can be judged to be separated in an auxiliary manner.
Example 3
This embodiment further illustrates the detachable synchronization module 5 on the basis of embodiment 1, and referring to fig. 6, the detachable synchronization module 5 includes a friction member provided at a proximal end gap of the catheter main body 1 and the control wire 2, and the friction member synchronizes the catheter main body 1 and the control wire 2 through friction resistance. The friction piece is cylindrical with one end open, is inserted into the gap between the catheter main body 1 and the control wire 2 and is respectively abutted with the catheter main body 1 and the control wire 2. The friction piece can be made of rubber materials, the catheter main body 1 and the control wire 2 are synchronous through friction force after insertion, when the friction piece is required to be removed, the friction piece is directly pulled out, the friction piece is convenient to assemble and disassemble, and a doctor can conveniently control whether the catheter main body 1 and the control wire 2 are synchronous or not.
In summary, the protective head 3 is arranged to cover the distal opening of the catheter main body 1, so that the catheter main body 1 is prevented from being clamped on the wall of a bifurcated blood vessel when passing through the bifurcated blood vessel, the 'windowsill effect' is solved, the blood vessel can be effectively protected, and the damage to the blood vessel is reduced. The control wire 2 is adopted to withdraw the protection head 3, so that the withdrawal of the protection head 3 is convenient and stable, and the protection head 3 is prevented from influencing the follow-up operation of the catheter main body 1.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.