Removable micro catheter for cerebrovascular interventional therapy

Abstract

The invention discloses a detachable micro-catheter for cerebrovascular interventional therapy, and relates to the technical field of medical instruments, the detachable micro-catheter comprises a micro-catheter main body and a head end, a first end of the micro-catheter main body is provided with a connecting plug, a first end of the head end is provided with a sleeving head, the connecting plug and the sleeving head are tubular, and the connecting plug can extend into the sleeving head; the connecting plug is fixedly sleeved with an annular limiting air bag, an annular groove corresponding to the air bag is formed in the outer wall of the connecting plug, and the air bag is partially embedded into the annular groove; an annular embedding groove corresponding to the air bag is formed in the inner wall of the sleeve joint; the inserting head extends into the sleeving head, and when the air bag is full of air, the air bag can be partially embedded into the embedding groove; a breather pipe is arranged in the pipe wall of the micro-catheter body, the first end of the breather pipe is communicated with the air bag, and the second end of the breather pipe extends out of the pipe wall of the micro-catheter body and is provided with a plug. The situation that the micro-catheter body and the head end are loosened or even disengaged due to accidents is effectively prevented, and the occurrence risk of medical accidents is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a detachable microcatheter for cerebrovascular interventional treatment. Background Art

[0002] Cerebral arteriovenous malformation is a common congenital vascular disease in the brain. The main treatment methods include surgical resection, intravascular embolization, and stereotactic radiotherapy. In recent years, with the advancement of embolic materials and technology, the use of new liquid embolic agents for intravascular embolization has become an important method for treating brain AVM. During the embolization process, a small amount of embolic agent backflow is usually required to block the proximal blood supply artery to ensure that the subsequent injection of glue can better diffuse to the target location. However, the backflow of glue may cause multiple risks. First, it may backflow into the blood supply artery of normal brain tissue and cause cerebral infarction. On the other hand, it may stick to the catheter, making it impossible to remove it, or cause the risk of vascular rupture and bleeding during the removal of the catheter. However, due to the concern about the occurrence of these two risks, insufficient backflow will occur, and the glue cannot be fully diffused into the lesion, thus failing to achieve the desired goal.

[0003] When embolic agent refluxes and the catheter becomes viscous, the tip of the microcatheter with detachable design can be separated from the proximal catheter to reduce the risk of difficulty in extubation. The tip remaining in the blood vessel generally does not cause adverse effects on the blood vessel. Microcatheters with detachable tip design have been used in clinical practice in recent years and have significantly reduced the difficulty in extubation and related complications.

[0004] The existing microcatheters with detachable head ends can basically meet the needs of use, but there are still certain defects: when detaching, the friction of the nested segments fits together. When the tension on the proximal tube body exceeds the detachment threshold (30g tension), the detachable head end is separated from the proximal catheter. The detachment is usually achieved by relying on the friction force at the detachment position. During cerebrovascular intervention, once the microcatheter needs to be pulled out due to excessive depth of intervention, the uncertainty of the tension can easily lead to the microcatheter body and the head end becoming loose or even detached due to an accident, resulting in a medical accident. Summary of the invention

[0005] The purpose of the present invention is to provide a detachable microcatheter for cerebrovascular interventional treatment to solve the problems existing in the above-mentioned prior art, prevent the microcatheter body and the head end from loosening or even detaching due to accidents during the intervention process, and improve the safety of use.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a detachable microcatheter for cerebrovascular interventional treatment, comprising a microcatheter body and a head end, wherein the first end of the microcatheter body is provided with a plug connector, and the first end of the head end is provided with a sleeve connector, wherein both the plug connector and the sleeve connector are tubular, and the plug connector can be inserted into the sleeve connector;

[0008] The plug connector is fixedly sleeved with an annular limiting airbag, the outer wall of the plug connector is provided with an annular groove corresponding to the airbag, and the airbag is partially embedded in the annular groove; the inner wall of the sleeve connector is provided with an annular embedding groove corresponding to the airbag;

[0009] The plug connector extends into the sleeve connector, and when the airbag is filled with air, the airbag can be partially embedded in the embedding groove;

[0010] A vent tube is arranged in the tube wall of the micro-catheter body, a first end of the vent tube is communicated with the air bag, and a second end of the vent tube extends out of the tube wall of the micro-catheter body and is installed with a plug.

[0011] Preferably, the second end of the microcatheter body is provided with a catheter seat for connecting the microcatheter body to a medical device.

[0012] Preferably, the catheter seat adopts a Luer connector.

[0013] Preferably, the first end of the microcatheter is further provided with a proximal end development mark, and the proximal end development mark is close to the plug connector.

[0014] Preferably, the second end of the head end is provided with a distal development mark.

[0015] Preferably, the microcatheter body comprises an inner layer, an intermediate layer fixedly sleeved on the outer side of the inner layer, and a hydrophilic coating layer fixedly sleeved on the outer side of the intermediate layer.

[0016] Preferably, a placement hole for placing the ventilation tube is provided in the microcatheter body, the placement hole includes an axial channel and a radial channel, one end of the radial channel is connected to the axial channel and the other end is open on the outer wall of the microcatheter body, and the axial channel is provided in the inner layer.

[0017] Preferably, the flexibility of the microcatheter body gradually increases from the second end to the first end.

[0018] Preferably, the material of the inner layer is polytetrafluoroethylene; and the middle layer is a densely wound spring made of stainless steel.

[0019] Preferably, the inner diameter of the microcatheter body is 0.017in, 0.021in or 0.027in; the length of the microcatheter body is 130cm-180cm; the second end of the head end is provided with a convex spherical tip, and the radius of the tip is 0.4mm-0.6mm.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The detachable microcatheter for cerebrovascular interventional treatment of the present invention is provided with an annular groove on the outer wall of the plug connector and an airbag therein, and air is injected into the airbag during the intervention process, so that the airbag expands and is partially embedded in the embedding groove, which can increase the friction between the plug connector and the sleeve connector, so that the position of the microcatheter body and the head end is locked; this effectively prevents the microcatheter body and the head end from loosening or even detaching due to an accident, greatly reducing the risk of medical accidents.

[0022] Furthermore, when the microcatheter body and the head end need to be released, the air in the airbag can be exhausted to the outside, so that the airbag can be deflated, the limit stop can be disconnected, and the friction between the plug and the plug connector can be reduced. At this time, when the microcatheter body is subjected to an external pulling force, the microcatheter body and the head end can be easily released, providing flexibility for medical operations.

[0023] Furthermore, the microcatheter body is provided with a hydrophilic coating, which can reduce the friction with the blood vessels, so as to facilitate the pushing of the microcatheter body without damaging the blood vessels. The pushing process can be smoother, reducing the damage to the patient's blood vessels.

[0024] Furthermore, the inner diameter of the microcatheter body is of a specific size, the length is between 130-180 cm, and the tip of the head is 0.4-0.6 mm. This design effectively alleviates friction and impact with the inner wall of the cerebral blood vessels during intervention, reducing damage to the cerebral blood vessels when pushing the microcatheter body.

[0025] Furthermore, the inner layer of the microcatheter body is made of PTFE material, which has a small friction coefficient, provides a smooth channel for interventional treatment and is conducive to the smooth passage of medical equipment.

[0026] Furthermore, the middle layer of the microcatheter body adopts a high-density stainless steel tightly wound spring, which provides excellent anti-kink ability and strong support, ensuring the integrity of the inner cavity of the tube. During cerebrovascular interventional treatment, the microcatheter body can be intervened without damaging the cerebral blood vessels, thereby improving the safety and reliability of the treatment.

[0027] Furthermore, a distal developing mark is provided at the tip end, and a proximal developing mark is provided at the end of the microcatheter body close to the tip end, which provides a basis for positioning judgment for the doctor, and can accurately judge whether the tip end is freed, which helps to improve the accuracy and safety of the operation.

[0028] Furthermore, the catheter seat adopts a Luer connector, which can be connected to other medical devices such as syringes, catheters for inserting guide wires, and injecting liquids into the microcatheter body, which facilitates medical operations and meets different treatment needs.

[0029] Furthermore, the microcatheter body gradually softens from the direction away from the head end to the direction close to the head end, which enables the microcatheter body to selectively enter the cerebral blood vessels while ensuring sufficient support, thereby adapting to different treatment scenarios and patient conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic structural diagram of a detachable microcatheter for cerebrovascular interventional treatment according to the present invention;

[0032] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0033] Figure 3 A schematic diagram of the partial structure of the detachable microcatheter for cerebrovascular interventional treatment according to the present invention Figure 1 ;

[0034] Figure 4 A schematic diagram of the partial structure of the detachable microcatheter for cerebrovascular interventional treatment according to the present invention Figure 2 ;

[0035] Figure 5 It is a schematic cross-sectional view of a microcatheter body in a detachable microcatheter for cerebrovascular interventional treatment according to the present invention;

[0036] In the figure: 1. Microcatheter body; 2. Catheter seat; 3. Head end; 4. Inner layer; 5. Middle layer; 6. Plug joint; 7. Sleeve joint; 8. Annular groove; 9. Air bag; 10. Ventilation tube; 11. Plug head; 12. Axial channel; 13. Hydrophilic coating; 14. Distal development mark; 15. Proximal development mark; 16. Embedded groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The purpose of the present invention is to provide a detachable microcatheter for cerebrovascular interventional treatment to solve the problems existing in the above-mentioned prior art, prevent the microcatheter body and the head end from loosening or even detaching due to accidents during the intervention process, and improve the safety of use.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1 to 5 As shown, the present invention provides a detachable microcatheter for cerebrovascular interventional treatment, comprising a microcatheter body 1 and a head end 3, a plug connector 6 is provided at the first end of the microcatheter body 1, a sleeve connector 7 is provided at the first end of the head end 3, the plug connector 6 and the sleeve connector 7 are both tubular, and the plug connector 6 can extend into the sleeve connector 7;

[0041] An annular limiting airbag 9 is fixedly sleeved on the plug connector 6, an annular groove 8 is provided on the outer wall of the plug connector 6 corresponding to the airbag 9, and the airbag 9 is partially embedded in the annular groove 8; an annular embedding groove 16 is provided on the inner wall of the sleeve connector 7 corresponding to the airbag 9;

[0042] When the plug connector 6 extends into the sleeve connector 7 and the airbag 9 is filled with air, the airbag 9 can be partially embedded in the embedding groove 16;

[0043] A ventilation tube 10 is arranged in the tube wall of the microcatheter body 1 , a first end of the ventilation tube 10 is communicated with the air bag 9 , and a second end of the ventilation tube 10 extends out of the tube wall of the microcatheter body 1 and is installed with a plug 11 .

[0044] The method of using the detachable microcatheter for cerebrovascular interventional treatment in this embodiment is as follows:

[0045] During use, when assembling the microcatheter body 1 and the head end 3, the sleeve joint 7 is forcefully inserted into the outside of the plug joint 6, so that the sleeve joint 7 fits with the outer surface of the outer wall of the plug joint 6, until the side wall of the sleeve joint 7 is tightly attached to the side wall of the end of the microcatheter body 1, and then the plug head 11 is pulled out, and air is injected into the air bag 9 through the trachea by means of an air pump, artificial blowing, etc., so that the air bag 9 swells and fills the internal space of the embedding groove 16 to increase the friction force, and then the tracheal tube opening is blocked with the plug head 11, and the air bag 9 locks the position of the sleeve joint 7 and the plug joint 6, so that the position of the microcatheter body 1 and the head end 3 is locked, and the sleeve joint 7 and the plug joint 6 can be tightly locked together, effectively preventing the microcatheter body 1 and the head end 3 from loosening or even detaching due to accidents during the intervention process, thereby avoiding medical accidents;

[0046] When the microcatheter body 1 needs to be released from the head end 3, the air in the airbag 9 is discharged to the outside through the trachea by pulling out the plug 11, thereby causing the airbag 9 to deflate, disconnecting the limiter, and reducing the friction between the sleeve joint 7 and the plug joint 6. When the microcatheter body 1 is subjected to an external pulling force, the plug joint 6 can be easily released from the sleeve joint 7 of the head end 3.

[0047] In the optional scheme of this embodiment, preferably, the second end of the microcatheter body 1 is provided with a catheter seat 2 for connecting the microcatheter body 1 to a medical device. The catheter seat 2 preferably adopts a Luer connector. The catheter seat 2 adopts a Luer connector, which can be connected to other medical devices such as a syringe, a catheter for inserting a guide wire, and an injection liquid into the microcatheter body 1, which facilitates medical operations and meets different treatment needs.

[0048] In the optional scheme of this embodiment, preferably, the first end of the microcatheter is further provided with a proximal development mark 15, and the proximal development mark 15 is close to the plug connector 6. The second end of the head end 3 is provided with a distal development mark 14. The proximal development mark 15 and the distal development mark 14 provide a positioning judgment basis for the doctor, and can accurately judge whether the head end 3 is released, which helps to improve the accuracy and safety of the operation.

[0049] In the optional scheme of this embodiment, it is more preferred that the microcatheter body 1 includes an inner layer 4, an intermediate layer 5 fixedly sleeved on the outer side of the inner layer 4, and a hydrophilic coating 13 fixedly sleeved on the outer side of the intermediate layer 5. The outermost hydrophilic coating 13 is provided to reduce the friction between the microcatheter body 1 and the blood vessel, so that the microcatheter body 1 can be pushed and the blood vessel is not easily damaged. This makes the microcatheter body 1 smoother during the pushing process, reducing the damage to the patient's blood vessels.

[0050] In an optional solution of this embodiment, it is more preferred that a placement hole for placing the ventilation tube 10 is provided in the microcatheter body 1, and the placement hole includes an axial channel 12 and a radial channel, one end of the radial channel is connected to the axial channel 12, and the other end is opened on the outer wall of the microcatheter body 1, and the axial channel 12 is provided in the inner layer 4. The axial channel 12 is provided in the inner layer 4, so as to avoid affecting the supporting performance of the intermediate layer 5.

[0051] In the optional scheme of this embodiment, it is more preferred that the flexibility of the microcatheter body 1 gradually increases from the second end to the first end, that is, the microcatheter body 1 becomes softer from the direction away from the head end 3 to the direction close to the head end 3. While ensuring sufficient support, the microcatheter body 1 can selectively enter the cerebral blood vessels, adapting to different treatment scenarios and patient conditions.

[0052] In the optional scheme of this embodiment, it is more preferred that the material of the inner layer 4 is polytetrafluoroethylene. The inner layer 4 of the microcatheter body 1 is made of PTFE material, which has a small friction coefficient and provides a smooth channel for interventional treatment, which is conducive to the smooth passage of medical equipment. The middle layer 5 is made of a densely wound spring made of stainless steel. The middle layer 5 provides excellent anti-kink ability and strong support, ensuring the integrity of the inner cavity of the tube body. When performing cerebrovascular interventional treatment, the microcatheter body 1 can be intervened without damaging the cerebral blood vessels, thereby improving the safety and reliability of the treatment.

[0053] In the optional scheme of this embodiment, it is more preferred that the inner diameter of the microcatheter body 1 is 0.017in, 0.021in or 0.027in; the length of the microcatheter body 1 is 130cm-180cm; the second end of the head end 3 is provided with a convex spherical tip, and the radius of the tip is 0.4mm-0.6mm. Such a design effectively alleviates the friction and impact with the inner wall of the cerebral blood vessels during intervention, and reduces the damage to the cerebral blood vessels when pushing the microcatheter body 1.

[0054] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A detachable microcatheter for cerebrovascular interventional treatment, characterized in that: It comprises a micro-catheter body and a head end, wherein the first end of the micro-catheter body is provided with a plug connector, and the first end of the head end is provided with a sleeve connector, the plug connector and the sleeve connector are both tubular, and the plug connector can be inserted into the sleeve connector; The plug connector is fixedly sleeved with an annular limiting airbag, the outer wall of the plug connector is provided with an annular groove corresponding to the airbag, and the airbag is partially embedded in the annular groove; the inner wall of the sleeve connector is provided with an annular embedding groove corresponding to the airbag; The plug connector extends into the sleeve connector, and when the airbag is filled with air, the airbag can be partially embedded in the embedding groove; A vent tube is arranged in the tube wall of the micro-catheter body, a first end of the vent tube is communicated with the air bag, and a second end of the vent tube extends out of the tube wall of the micro-catheter body and is installed with a plug.

2. The detachable microcatheter for cerebrovascular interventional treatment according to claim 1, characterized in that: The second end of the microcatheter body is provided with a catheter seat for connecting the microcatheter body to a medical device.

3. The detachable microcatheter for cerebrovascular interventional treatment according to claim 2, characterized in that: The catheter seat adopts a Luer connector.

4. The detachable microcatheter for cerebrovascular interventional treatment according to claim 1, characterized in that: The first end of the micro-catheter is also provided with a proximal end development mark, and the proximal end development mark is close to the plug connector.

5. The detachable microcatheter for cerebrovascular interventional treatment according to claim 1, characterized in that: The second end of the head end is provided with a distal development mark.

6. The detachable microcatheter for cerebrovascular interventional treatment according to claim 1, characterized in that: The micro-catheter body comprises an inner layer, an intermediate layer fixedly sleeved on the outer side of the inner layer, and a hydrophilic coating layer fixedly sleeved on the outer side of the intermediate layer.

7. The detachable microcatheter for cerebrovascular interventional treatment according to claim 6, characterized in that: The microcatheter body is provided with a placement hole for placing the ventilation tube, the placement hole comprises an axial channel and a radial channel, one end of the radial channel is connected with the axial channel and the other end is opened on the outer wall of the microcatheter body, and the axial channel is provided in the inner layer.

8. The detachable microcatheter for cerebrovascular interventional treatment according to claim 1, characterized in that: The flexibility of the microcatheter body gradually increases from the second end to the first end.

9. The detachable microcatheter for cerebrovascular interventional treatment according to claim 6, characterized in that: The material of the inner layer is polytetrafluoroethylene; the middle layer is a densely wound spring made of stainless steel.

10. The detachable microcatheter for cerebrovascular interventional treatment according to claim 1, characterized in that: The inner diameter of the microcatheter body is 0.017in, 0.021in or 0.027in; the length of the microcatheter body is 130cm-180cm; the second end of the head end is provided with a convex spherical tip, and the radius of the tip is 0.4mm-0.6mm.

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